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mac80211: enhance tracing
[deliverable/linux.git] / net / mac80211 / mlme.c
1 /*
2 * BSS client mode implementation
3 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4 * Copyright 2004, Instant802 Networks, Inc.
5 * Copyright 2005, Devicescape Software, Inc.
6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14 #include <linux/delay.h>
15 #include <linux/if_ether.h>
16 #include <linux/skbuff.h>
17 #include <linux/if_arp.h>
18 #include <linux/etherdevice.h>
19 #include <linux/rtnetlink.h>
20 #include <linux/pm_qos_params.h>
21 #include <linux/crc32.h>
22 #include <net/mac80211.h>
23 #include <asm/unaligned.h>
24
25 #include "ieee80211_i.h"
26 #include "driver-ops.h"
27 #include "rate.h"
28 #include "led.h"
29
30 #define IEEE80211_MAX_PROBE_TRIES 5
31
32 /*
33 * beacon loss detection timeout
34 * XXX: should depend on beacon interval
35 */
36 #define IEEE80211_BEACON_LOSS_TIME (2 * HZ)
37 /*
38 * Time the connection can be idle before we probe
39 * it to see if we can still talk to the AP.
40 */
41 #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ)
42 /*
43 * Time we wait for a probe response after sending
44 * a probe request because of beacon loss or for
45 * checking the connection still works.
46 */
47 #define IEEE80211_PROBE_WAIT (HZ / 2)
48
49 /*
50 * Weight given to the latest Beacon frame when calculating average signal
51 * strength for Beacon frames received in the current BSS. This must be
52 * between 1 and 15.
53 */
54 #define IEEE80211_SIGNAL_AVE_WEIGHT 3
55
56 #define TMR_RUNNING_TIMER 0
57 #define TMR_RUNNING_CHANSW 1
58
59 /*
60 * All cfg80211 functions have to be called outside a locked
61 * section so that they can acquire a lock themselves... This
62 * is much simpler than queuing up things in cfg80211, but we
63 * do need some indirection for that here.
64 */
65 enum rx_mgmt_action {
66 /* no action required */
67 RX_MGMT_NONE,
68
69 /* caller must call cfg80211_send_rx_auth() */
70 RX_MGMT_CFG80211_AUTH,
71
72 /* caller must call cfg80211_send_rx_assoc() */
73 RX_MGMT_CFG80211_ASSOC,
74
75 /* caller must call cfg80211_send_deauth() */
76 RX_MGMT_CFG80211_DEAUTH,
77
78 /* caller must call cfg80211_send_disassoc() */
79 RX_MGMT_CFG80211_DISASSOC,
80
81 /* caller must tell cfg80211 about internal error */
82 RX_MGMT_CFG80211_ASSOC_ERROR,
83 };
84
85 /* utils */
86 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
87 {
88 WARN_ON(!mutex_is_locked(&ifmgd->mtx));
89 }
90
91 /*
92 * We can have multiple work items (and connection probing)
93 * scheduling this timer, but we need to take care to only
94 * reschedule it when it should fire _earlier_ than it was
95 * asked for before, or if it's not pending right now. This
96 * function ensures that. Note that it then is required to
97 * run this function for all timeouts after the first one
98 * has happened -- the work that runs from this timer will
99 * do that.
100 */
101 static void run_again(struct ieee80211_if_managed *ifmgd,
102 unsigned long timeout)
103 {
104 ASSERT_MGD_MTX(ifmgd);
105
106 if (!timer_pending(&ifmgd->timer) ||
107 time_before(timeout, ifmgd->timer.expires))
108 mod_timer(&ifmgd->timer, timeout);
109 }
110
111 static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata)
112 {
113 if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
114 return;
115
116 mod_timer(&sdata->u.mgd.bcn_mon_timer,
117 round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME));
118 }
119
120 static int ecw2cw(int ecw)
121 {
122 return (1 << ecw) - 1;
123 }
124
125 /*
126 * ieee80211_enable_ht should be called only after the operating band
127 * has been determined as ht configuration depends on the hw's
128 * HT abilities for a specific band.
129 */
130 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
131 struct ieee80211_ht_info *hti,
132 const u8 *bssid, u16 ap_ht_cap_flags)
133 {
134 struct ieee80211_local *local = sdata->local;
135 struct ieee80211_supported_band *sband;
136 struct sta_info *sta;
137 u32 changed = 0;
138 u16 ht_opmode;
139 bool enable_ht = true, ht_changed;
140 enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
141
142 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
143
144 /* HT is not supported */
145 if (!sband->ht_cap.ht_supported)
146 enable_ht = false;
147
148 /* check that channel matches the right operating channel */
149 if (local->hw.conf.channel->center_freq !=
150 ieee80211_channel_to_frequency(hti->control_chan))
151 enable_ht = false;
152
153 if (enable_ht) {
154 channel_type = NL80211_CHAN_HT20;
155
156 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
157 (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
158 (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
159 switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
160 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
161 if (!(local->hw.conf.channel->flags &
162 IEEE80211_CHAN_NO_HT40PLUS))
163 channel_type = NL80211_CHAN_HT40PLUS;
164 break;
165 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
166 if (!(local->hw.conf.channel->flags &
167 IEEE80211_CHAN_NO_HT40MINUS))
168 channel_type = NL80211_CHAN_HT40MINUS;
169 break;
170 }
171 }
172 }
173
174 ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
175 channel_type != local->hw.conf.channel_type;
176
177 local->oper_channel_type = channel_type;
178
179 if (ht_changed) {
180 /* channel_type change automatically detected */
181 ieee80211_hw_config(local, 0);
182
183 rcu_read_lock();
184 sta = sta_info_get(sdata, bssid);
185 if (sta)
186 rate_control_rate_update(local, sband, sta,
187 IEEE80211_RC_HT_CHANGED,
188 local->oper_channel_type);
189 rcu_read_unlock();
190 }
191
192 /* disable HT */
193 if (!enable_ht)
194 return 0;
195
196 ht_opmode = le16_to_cpu(hti->operation_mode);
197
198 /* if bss configuration changed store the new one */
199 if (!sdata->ht_opmode_valid ||
200 sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
201 changed |= BSS_CHANGED_HT;
202 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
203 sdata->ht_opmode_valid = true;
204 }
205
206 return changed;
207 }
208
209 /* frame sending functions */
210
211 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
212 const u8 *bssid, u16 stype, u16 reason,
213 void *cookie, bool send_frame)
214 {
215 struct ieee80211_local *local = sdata->local;
216 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
217 struct sk_buff *skb;
218 struct ieee80211_mgmt *mgmt;
219
220 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
221 if (!skb) {
222 printk(KERN_DEBUG "%s: failed to allocate buffer for "
223 "deauth/disassoc frame\n", sdata->name);
224 return;
225 }
226 skb_reserve(skb, local->hw.extra_tx_headroom);
227
228 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
229 memset(mgmt, 0, 24);
230 memcpy(mgmt->da, bssid, ETH_ALEN);
231 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
232 memcpy(mgmt->bssid, bssid, ETH_ALEN);
233 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
234 skb_put(skb, 2);
235 /* u.deauth.reason_code == u.disassoc.reason_code */
236 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
237
238 if (stype == IEEE80211_STYPE_DEAUTH)
239 if (cookie)
240 __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
241 else
242 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
243 else
244 if (cookie)
245 __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
246 else
247 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
248 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
249 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
250
251 if (send_frame)
252 ieee80211_tx_skb(sdata, skb);
253 else
254 kfree_skb(skb);
255 }
256
257 void ieee80211_send_pspoll(struct ieee80211_local *local,
258 struct ieee80211_sub_if_data *sdata)
259 {
260 struct ieee80211_pspoll *pspoll;
261 struct sk_buff *skb;
262
263 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
264 if (!skb)
265 return;
266
267 pspoll = (struct ieee80211_pspoll *) skb->data;
268 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
269
270 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
271 ieee80211_tx_skb(sdata, skb);
272 }
273
274 void ieee80211_send_nullfunc(struct ieee80211_local *local,
275 struct ieee80211_sub_if_data *sdata,
276 int powersave)
277 {
278 struct sk_buff *skb;
279 struct ieee80211_hdr_3addr *nullfunc;
280
281 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
282 if (!skb)
283 return;
284
285 nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
286 if (powersave)
287 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
288
289 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
290 ieee80211_tx_skb(sdata, skb);
291 }
292
293 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
294 struct ieee80211_sub_if_data *sdata)
295 {
296 struct sk_buff *skb;
297 struct ieee80211_hdr *nullfunc;
298 __le16 fc;
299
300 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
301 return;
302
303 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
304 if (!skb) {
305 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
306 "nullfunc frame\n", sdata->name);
307 return;
308 }
309 skb_reserve(skb, local->hw.extra_tx_headroom);
310
311 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
312 memset(nullfunc, 0, 30);
313 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
314 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
315 nullfunc->frame_control = fc;
316 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
317 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
318 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
319 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
320
321 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
322 ieee80211_tx_skb(sdata, skb);
323 }
324
325 /* spectrum management related things */
326 static void ieee80211_chswitch_work(struct work_struct *work)
327 {
328 struct ieee80211_sub_if_data *sdata =
329 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
330 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
331
332 if (!ieee80211_sdata_running(sdata))
333 return;
334
335 mutex_lock(&ifmgd->mtx);
336 if (!ifmgd->associated)
337 goto out;
338
339 sdata->local->oper_channel = sdata->local->csa_channel;
340 ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL);
341
342 /* XXX: shouldn't really modify cfg80211-owned data! */
343 ifmgd->associated->channel = sdata->local->oper_channel;
344
345 ieee80211_wake_queues_by_reason(&sdata->local->hw,
346 IEEE80211_QUEUE_STOP_REASON_CSA);
347 out:
348 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
349 mutex_unlock(&ifmgd->mtx);
350 }
351
352 static void ieee80211_chswitch_timer(unsigned long data)
353 {
354 struct ieee80211_sub_if_data *sdata =
355 (struct ieee80211_sub_if_data *) data;
356 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
357
358 if (sdata->local->quiescing) {
359 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
360 return;
361 }
362
363 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
364 }
365
366 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
367 struct ieee80211_channel_sw_ie *sw_elem,
368 struct ieee80211_bss *bss)
369 {
370 struct cfg80211_bss *cbss =
371 container_of((void *)bss, struct cfg80211_bss, priv);
372 struct ieee80211_channel *new_ch;
373 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
374 int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
375
376 ASSERT_MGD_MTX(ifmgd);
377
378 if (!ifmgd->associated)
379 return;
380
381 if (sdata->local->scanning)
382 return;
383
384 /* Disregard subsequent beacons if we are already running a timer
385 processing a CSA */
386
387 if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
388 return;
389
390 new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
391 if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
392 return;
393
394 sdata->local->csa_channel = new_ch;
395
396 if (sw_elem->count <= 1) {
397 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
398 } else {
399 ieee80211_stop_queues_by_reason(&sdata->local->hw,
400 IEEE80211_QUEUE_STOP_REASON_CSA);
401 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
402 mod_timer(&ifmgd->chswitch_timer,
403 jiffies +
404 msecs_to_jiffies(sw_elem->count *
405 cbss->beacon_interval));
406 }
407 }
408
409 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
410 u16 capab_info, u8 *pwr_constr_elem,
411 u8 pwr_constr_elem_len)
412 {
413 struct ieee80211_conf *conf = &sdata->local->hw.conf;
414
415 if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
416 return;
417
418 /* Power constraint IE length should be 1 octet */
419 if (pwr_constr_elem_len != 1)
420 return;
421
422 if ((*pwr_constr_elem <= conf->channel->max_power) &&
423 (*pwr_constr_elem != sdata->local->power_constr_level)) {
424 sdata->local->power_constr_level = *pwr_constr_elem;
425 ieee80211_hw_config(sdata->local, 0);
426 }
427 }
428
429 /* powersave */
430 static void ieee80211_enable_ps(struct ieee80211_local *local,
431 struct ieee80211_sub_if_data *sdata)
432 {
433 struct ieee80211_conf *conf = &local->hw.conf;
434
435 /*
436 * If we are scanning right now then the parameters will
437 * take effect when scan finishes.
438 */
439 if (local->scanning)
440 return;
441
442 if (conf->dynamic_ps_timeout > 0 &&
443 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
444 mod_timer(&local->dynamic_ps_timer, jiffies +
445 msecs_to_jiffies(conf->dynamic_ps_timeout));
446 } else {
447 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
448 ieee80211_send_nullfunc(local, sdata, 1);
449
450 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
451 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
452 return;
453
454 conf->flags |= IEEE80211_CONF_PS;
455 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
456 }
457 }
458
459 static void ieee80211_change_ps(struct ieee80211_local *local)
460 {
461 struct ieee80211_conf *conf = &local->hw.conf;
462
463 if (local->ps_sdata) {
464 ieee80211_enable_ps(local, local->ps_sdata);
465 } else if (conf->flags & IEEE80211_CONF_PS) {
466 conf->flags &= ~IEEE80211_CONF_PS;
467 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
468 del_timer_sync(&local->dynamic_ps_timer);
469 cancel_work_sync(&local->dynamic_ps_enable_work);
470 }
471 }
472
473 /* need to hold RTNL or interface lock */
474 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
475 {
476 struct ieee80211_sub_if_data *sdata, *found = NULL;
477 int count = 0;
478
479 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
480 local->ps_sdata = NULL;
481 return;
482 }
483
484 if (!list_empty(&local->work_list)) {
485 local->ps_sdata = NULL;
486 goto change;
487 }
488
489 list_for_each_entry(sdata, &local->interfaces, list) {
490 if (!ieee80211_sdata_running(sdata))
491 continue;
492 if (sdata->vif.type != NL80211_IFTYPE_STATION)
493 continue;
494 found = sdata;
495 count++;
496 }
497
498 if (count == 1 && found->u.mgd.powersave &&
499 found->u.mgd.associated &&
500 found->u.mgd.associated->beacon_ies &&
501 !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
502 IEEE80211_STA_CONNECTION_POLL))) {
503 s32 beaconint_us;
504
505 if (latency < 0)
506 latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
507
508 beaconint_us = ieee80211_tu_to_usec(
509 found->vif.bss_conf.beacon_int);
510
511 if (beaconint_us > latency) {
512 local->ps_sdata = NULL;
513 } else {
514 struct ieee80211_bss *bss;
515 int maxslp = 1;
516 u8 dtimper;
517
518 bss = (void *)found->u.mgd.associated->priv;
519 dtimper = bss->dtim_period;
520
521 /* If the TIM IE is invalid, pretend the value is 1 */
522 if (!dtimper)
523 dtimper = 1;
524 else if (dtimper > 1)
525 maxslp = min_t(int, dtimper,
526 latency / beaconint_us);
527
528 local->hw.conf.max_sleep_period = maxslp;
529 local->hw.conf.ps_dtim_period = dtimper;
530 local->ps_sdata = found;
531 }
532 } else {
533 local->ps_sdata = NULL;
534 }
535
536 change:
537 ieee80211_change_ps(local);
538 }
539
540 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
541 {
542 struct ieee80211_local *local =
543 container_of(work, struct ieee80211_local,
544 dynamic_ps_disable_work);
545
546 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
547 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
548 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
549 }
550
551 ieee80211_wake_queues_by_reason(&local->hw,
552 IEEE80211_QUEUE_STOP_REASON_PS);
553 }
554
555 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
556 {
557 struct ieee80211_local *local =
558 container_of(work, struct ieee80211_local,
559 dynamic_ps_enable_work);
560 struct ieee80211_sub_if_data *sdata = local->ps_sdata;
561 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
562
563 /* can only happen when PS was just disabled anyway */
564 if (!sdata)
565 return;
566
567 if (local->hw.conf.flags & IEEE80211_CONF_PS)
568 return;
569
570 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
571 (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
572 ieee80211_send_nullfunc(local, sdata, 1);
573
574 if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
575 (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
576 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
577 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
578 local->hw.conf.flags |= IEEE80211_CONF_PS;
579 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
580 }
581 }
582
583 void ieee80211_dynamic_ps_timer(unsigned long data)
584 {
585 struct ieee80211_local *local = (void *) data;
586
587 if (local->quiescing || local->suspended)
588 return;
589
590 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
591 }
592
593 /* MLME */
594 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
595 struct ieee80211_if_managed *ifmgd,
596 u8 *wmm_param, size_t wmm_param_len)
597 {
598 struct ieee80211_tx_queue_params params;
599 size_t left;
600 int count;
601 u8 *pos, uapsd_queues = 0;
602
603 if (!local->ops->conf_tx)
604 return;
605
606 if (local->hw.queues < 4)
607 return;
608
609 if (!wmm_param)
610 return;
611
612 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
613 return;
614
615 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
616 uapsd_queues = local->uapsd_queues;
617
618 count = wmm_param[6] & 0x0f;
619 if (count == ifmgd->wmm_last_param_set)
620 return;
621 ifmgd->wmm_last_param_set = count;
622
623 pos = wmm_param + 8;
624 left = wmm_param_len - 8;
625
626 memset(&params, 0, sizeof(params));
627
628 local->wmm_acm = 0;
629 for (; left >= 4; left -= 4, pos += 4) {
630 int aci = (pos[0] >> 5) & 0x03;
631 int acm = (pos[0] >> 4) & 0x01;
632 bool uapsd = false;
633 int queue;
634
635 switch (aci) {
636 case 1: /* AC_BK */
637 queue = 3;
638 if (acm)
639 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
640 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
641 uapsd = true;
642 break;
643 case 2: /* AC_VI */
644 queue = 1;
645 if (acm)
646 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
647 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
648 uapsd = true;
649 break;
650 case 3: /* AC_VO */
651 queue = 0;
652 if (acm)
653 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
654 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
655 uapsd = true;
656 break;
657 case 0: /* AC_BE */
658 default:
659 queue = 2;
660 if (acm)
661 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
662 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
663 uapsd = true;
664 break;
665 }
666
667 params.aifs = pos[0] & 0x0f;
668 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
669 params.cw_min = ecw2cw(pos[1] & 0x0f);
670 params.txop = get_unaligned_le16(pos + 2);
671 params.uapsd = uapsd;
672
673 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
674 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
675 "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
676 wiphy_name(local->hw.wiphy), queue, aci, acm,
677 params.aifs, params.cw_min, params.cw_max, params.txop,
678 params.uapsd);
679 #endif
680 if (drv_conf_tx(local, queue, &params))
681 printk(KERN_DEBUG "%s: failed to set TX queue "
682 "parameters for queue %d\n",
683 wiphy_name(local->hw.wiphy), queue);
684 }
685
686 /* enable WMM or activate new settings */
687 local->hw.conf.flags |= IEEE80211_CONF_QOS;
688 drv_config(local, IEEE80211_CONF_CHANGE_QOS);
689 }
690
691 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
692 u16 capab, bool erp_valid, u8 erp)
693 {
694 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
695 u32 changed = 0;
696 bool use_protection;
697 bool use_short_preamble;
698 bool use_short_slot;
699
700 if (erp_valid) {
701 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
702 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
703 } else {
704 use_protection = false;
705 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
706 }
707
708 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
709 if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
710 use_short_slot = true;
711
712 if (use_protection != bss_conf->use_cts_prot) {
713 bss_conf->use_cts_prot = use_protection;
714 changed |= BSS_CHANGED_ERP_CTS_PROT;
715 }
716
717 if (use_short_preamble != bss_conf->use_short_preamble) {
718 bss_conf->use_short_preamble = use_short_preamble;
719 changed |= BSS_CHANGED_ERP_PREAMBLE;
720 }
721
722 if (use_short_slot != bss_conf->use_short_slot) {
723 bss_conf->use_short_slot = use_short_slot;
724 changed |= BSS_CHANGED_ERP_SLOT;
725 }
726
727 return changed;
728 }
729
730 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
731 struct cfg80211_bss *cbss,
732 u32 bss_info_changed)
733 {
734 struct ieee80211_bss *bss = (void *)cbss->priv;
735 struct ieee80211_local *local = sdata->local;
736
737 bss_info_changed |= BSS_CHANGED_ASSOC;
738 /* set timing information */
739 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
740 sdata->vif.bss_conf.timestamp = cbss->tsf;
741
742 bss_info_changed |= BSS_CHANGED_BEACON_INT;
743 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
744 cbss->capability, bss->has_erp_value, bss->erp_value);
745
746 sdata->u.mgd.associated = cbss;
747 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
748
749 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
750
751 /* just to be sure */
752 sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
753 IEEE80211_STA_BEACON_POLL);
754
755 /*
756 * Always handle WMM once after association regardless
757 * of the first value the AP uses. Setting -1 here has
758 * that effect because the AP values is an unsigned
759 * 4-bit value.
760 */
761 sdata->u.mgd.wmm_last_param_set = -1;
762
763 ieee80211_led_assoc(local, 1);
764
765 sdata->vif.bss_conf.assoc = 1;
766 /*
767 * For now just always ask the driver to update the basic rateset
768 * when we have associated, we aren't checking whether it actually
769 * changed or not.
770 */
771 bss_info_changed |= BSS_CHANGED_BASIC_RATES;
772
773 /* And the BSSID changed - we're associated now */
774 bss_info_changed |= BSS_CHANGED_BSSID;
775
776 /* Tell the driver to monitor connection quality (if supported) */
777 if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
778 sdata->vif.bss_conf.cqm_rssi_thold)
779 bss_info_changed |= BSS_CHANGED_CQM;
780
781 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
782
783 mutex_lock(&local->iflist_mtx);
784 ieee80211_recalc_ps(local, -1);
785 ieee80211_recalc_smps(local, sdata);
786 mutex_unlock(&local->iflist_mtx);
787
788 netif_tx_start_all_queues(sdata->dev);
789 netif_carrier_on(sdata->dev);
790 }
791
792 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
793 bool remove_sta)
794 {
795 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
796 struct ieee80211_local *local = sdata->local;
797 struct sta_info *sta;
798 u32 changed = 0, config_changed = 0;
799 u8 bssid[ETH_ALEN];
800
801 ASSERT_MGD_MTX(ifmgd);
802
803 if (WARN_ON(!ifmgd->associated))
804 return;
805
806 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
807
808 ifmgd->associated = NULL;
809 memset(ifmgd->bssid, 0, ETH_ALEN);
810
811 /*
812 * we need to commit the associated = NULL change because the
813 * scan code uses that to determine whether this iface should
814 * go to/wake up from powersave or not -- and could otherwise
815 * wake the queues erroneously.
816 */
817 smp_mb();
818
819 /*
820 * Thus, we can only afterwards stop the queues -- to account
821 * for the case where another CPU is finishing a scan at this
822 * time -- we don't want the scan code to enable queues.
823 */
824
825 netif_tx_stop_all_queues(sdata->dev);
826 netif_carrier_off(sdata->dev);
827
828 rcu_read_lock();
829 sta = sta_info_get(sdata, bssid);
830 if (sta) {
831 set_sta_flags(sta, WLAN_STA_DISASSOC);
832 ieee80211_sta_tear_down_BA_sessions(sta);
833 }
834 rcu_read_unlock();
835
836 changed |= ieee80211_reset_erp_info(sdata);
837
838 ieee80211_led_assoc(local, 0);
839 changed |= BSS_CHANGED_ASSOC;
840 sdata->vif.bss_conf.assoc = false;
841
842 ieee80211_set_wmm_default(sdata);
843
844 /* channel(_type) changes are handled by ieee80211_hw_config */
845 local->oper_channel_type = NL80211_CHAN_NO_HT;
846
847 /* on the next assoc, re-program HT parameters */
848 sdata->ht_opmode_valid = false;
849
850 local->power_constr_level = 0;
851
852 del_timer_sync(&local->dynamic_ps_timer);
853 cancel_work_sync(&local->dynamic_ps_enable_work);
854
855 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
856 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
857 config_changed |= IEEE80211_CONF_CHANGE_PS;
858 }
859
860 ieee80211_hw_config(local, config_changed);
861
862 /* And the BSSID changed -- not very interesting here */
863 changed |= BSS_CHANGED_BSSID;
864 ieee80211_bss_info_change_notify(sdata, changed);
865
866 if (remove_sta)
867 sta_info_destroy_addr(sdata, bssid);
868 }
869
870 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
871 struct ieee80211_hdr *hdr)
872 {
873 /*
874 * We can postpone the mgd.timer whenever receiving unicast frames
875 * from AP because we know that the connection is working both ways
876 * at that time. But multicast frames (and hence also beacons) must
877 * be ignored here, because we need to trigger the timer during
878 * data idle periods for sending the periodic probe request to the
879 * AP we're connected to.
880 */
881 if (is_multicast_ether_addr(hdr->addr1))
882 return;
883
884 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
885 return;
886
887 mod_timer(&sdata->u.mgd.conn_mon_timer,
888 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
889 }
890
891 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
892 {
893 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
894 const u8 *ssid;
895
896 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
897 ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
898 ssid + 2, ssid[1], NULL, 0);
899
900 ifmgd->probe_send_count++;
901 ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
902 run_again(ifmgd, ifmgd->probe_timeout);
903 }
904
905 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
906 bool beacon)
907 {
908 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
909 bool already = false;
910
911 if (!ieee80211_sdata_running(sdata))
912 return;
913
914 if (sdata->local->scanning)
915 return;
916
917 if (sdata->local->tmp_channel)
918 return;
919
920 mutex_lock(&ifmgd->mtx);
921
922 if (!ifmgd->associated)
923 goto out;
924
925 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
926 if (beacon && net_ratelimit())
927 printk(KERN_DEBUG "%s: detected beacon loss from AP "
928 "- sending probe request\n", sdata->name);
929 #endif
930
931 /*
932 * The driver/our work has already reported this event or the
933 * connection monitoring has kicked in and we have already sent
934 * a probe request. Or maybe the AP died and the driver keeps
935 * reporting until we disassociate...
936 *
937 * In either case we have to ignore the current call to this
938 * function (except for setting the correct probe reason bit)
939 * because otherwise we would reset the timer every time and
940 * never check whether we received a probe response!
941 */
942 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
943 IEEE80211_STA_CONNECTION_POLL))
944 already = true;
945
946 if (beacon)
947 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
948 else
949 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
950
951 if (already)
952 goto out;
953
954 mutex_lock(&sdata->local->iflist_mtx);
955 ieee80211_recalc_ps(sdata->local, -1);
956 mutex_unlock(&sdata->local->iflist_mtx);
957
958 ifmgd->probe_send_count = 0;
959 ieee80211_mgd_probe_ap_send(sdata);
960 out:
961 mutex_unlock(&ifmgd->mtx);
962 }
963
964 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
965 {
966 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
967 struct ieee80211_local *local = sdata->local;
968 u8 bssid[ETH_ALEN];
969
970 mutex_lock(&ifmgd->mtx);
971 if (!ifmgd->associated) {
972 mutex_unlock(&ifmgd->mtx);
973 return;
974 }
975
976 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
977
978 printk(KERN_DEBUG "Connection to AP %pM lost.\n", bssid);
979
980 ieee80211_set_disassoc(sdata, true);
981 ieee80211_recalc_idle(local);
982 mutex_unlock(&ifmgd->mtx);
983 /*
984 * must be outside lock due to cfg80211,
985 * but that's not a problem.
986 */
987 ieee80211_send_deauth_disassoc(sdata, bssid,
988 IEEE80211_STYPE_DEAUTH,
989 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
990 NULL, true);
991 }
992
993 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
994 {
995 struct ieee80211_sub_if_data *sdata =
996 container_of(work, struct ieee80211_sub_if_data,
997 u.mgd.beacon_connection_loss_work);
998
999 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1000 __ieee80211_connection_loss(sdata);
1001 else
1002 ieee80211_mgd_probe_ap(sdata, true);
1003 }
1004
1005 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1006 {
1007 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1008 struct ieee80211_hw *hw = &sdata->local->hw;
1009
1010 trace_api_beacon_loss(sdata);
1011
1012 WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1013 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1014 }
1015 EXPORT_SYMBOL(ieee80211_beacon_loss);
1016
1017 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1018 {
1019 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1020 struct ieee80211_hw *hw = &sdata->local->hw;
1021
1022 trace_api_connection_loss(sdata);
1023
1024 WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1025 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1026 }
1027 EXPORT_SYMBOL(ieee80211_connection_loss);
1028
1029
1030 static enum rx_mgmt_action __must_check
1031 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1032 struct ieee80211_mgmt *mgmt, size_t len)
1033 {
1034 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1035 const u8 *bssid = NULL;
1036 u16 reason_code;
1037
1038 if (len < 24 + 2)
1039 return RX_MGMT_NONE;
1040
1041 ASSERT_MGD_MTX(ifmgd);
1042
1043 bssid = ifmgd->associated->bssid;
1044
1045 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1046
1047 printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1048 sdata->name, bssid, reason_code);
1049
1050 ieee80211_set_disassoc(sdata, true);
1051 ieee80211_recalc_idle(sdata->local);
1052
1053 return RX_MGMT_CFG80211_DEAUTH;
1054 }
1055
1056
1057 static enum rx_mgmt_action __must_check
1058 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1059 struct ieee80211_mgmt *mgmt, size_t len)
1060 {
1061 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1062 u16 reason_code;
1063
1064 if (len < 24 + 2)
1065 return RX_MGMT_NONE;
1066
1067 ASSERT_MGD_MTX(ifmgd);
1068
1069 if (WARN_ON(!ifmgd->associated))
1070 return RX_MGMT_NONE;
1071
1072 if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1073 return RX_MGMT_NONE;
1074
1075 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1076
1077 printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1078 sdata->name, mgmt->sa, reason_code);
1079
1080 ieee80211_set_disassoc(sdata, true);
1081 ieee80211_recalc_idle(sdata->local);
1082 return RX_MGMT_CFG80211_DISASSOC;
1083 }
1084
1085
1086 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1087 struct ieee80211_mgmt *mgmt, size_t len)
1088 {
1089 struct ieee80211_sub_if_data *sdata = wk->sdata;
1090 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1091 struct ieee80211_local *local = sdata->local;
1092 struct ieee80211_supported_band *sband;
1093 struct sta_info *sta;
1094 struct cfg80211_bss *cbss = wk->assoc.bss;
1095 u8 *pos;
1096 u32 rates, basic_rates;
1097 u16 capab_info, aid;
1098 struct ieee802_11_elems elems;
1099 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1100 u32 changed = 0;
1101 int i, j, err;
1102 bool have_higher_than_11mbit = false;
1103 u16 ap_ht_cap_flags;
1104
1105 /* AssocResp and ReassocResp have identical structure */
1106
1107 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1108 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1109
1110 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1111 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1112 "set\n", sdata->name, aid);
1113 aid &= ~(BIT(15) | BIT(14));
1114
1115 pos = mgmt->u.assoc_resp.variable;
1116 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1117
1118 if (!elems.supp_rates) {
1119 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1120 sdata->name);
1121 return false;
1122 }
1123
1124 ifmgd->aid = aid;
1125
1126 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1127 if (!sta) {
1128 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1129 " the AP\n", sdata->name);
1130 return false;
1131 }
1132
1133 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1134 WLAN_STA_ASSOC_AP);
1135 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1136 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1137
1138 rates = 0;
1139 basic_rates = 0;
1140 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1141
1142 for (i = 0; i < elems.supp_rates_len; i++) {
1143 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1144 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1145
1146 if (rate > 110)
1147 have_higher_than_11mbit = true;
1148
1149 for (j = 0; j < sband->n_bitrates; j++) {
1150 if (sband->bitrates[j].bitrate == rate) {
1151 rates |= BIT(j);
1152 if (is_basic)
1153 basic_rates |= BIT(j);
1154 break;
1155 }
1156 }
1157 }
1158
1159 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1160 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1161 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1162
1163 if (rate > 110)
1164 have_higher_than_11mbit = true;
1165
1166 for (j = 0; j < sband->n_bitrates; j++) {
1167 if (sband->bitrates[j].bitrate == rate) {
1168 rates |= BIT(j);
1169 if (is_basic)
1170 basic_rates |= BIT(j);
1171 break;
1172 }
1173 }
1174 }
1175
1176 sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1177 sdata->vif.bss_conf.basic_rates = basic_rates;
1178
1179 /* cf. IEEE 802.11 9.2.12 */
1180 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1181 have_higher_than_11mbit)
1182 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1183 else
1184 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1185
1186 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1187 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1188 elems.ht_cap_elem, &sta->sta.ht_cap);
1189
1190 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1191
1192 rate_control_rate_init(sta);
1193
1194 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1195 set_sta_flags(sta, WLAN_STA_MFP);
1196
1197 if (elems.wmm_param)
1198 set_sta_flags(sta, WLAN_STA_WME);
1199
1200 err = sta_info_insert(sta);
1201 sta = NULL;
1202 if (err) {
1203 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1204 " the AP (error %d)\n", sdata->name, err);
1205 return false;
1206 }
1207
1208 if (elems.wmm_param)
1209 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1210 elems.wmm_param_len);
1211 else
1212 ieee80211_set_wmm_default(sdata);
1213
1214 local->oper_channel = wk->chan;
1215
1216 if (elems.ht_info_elem && elems.wmm_param &&
1217 (sdata->local->hw.queues >= 4) &&
1218 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1219 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1220 cbss->bssid, ap_ht_cap_flags);
1221
1222 /* set AID and assoc capability,
1223 * ieee80211_set_associated() will tell the driver */
1224 bss_conf->aid = aid;
1225 bss_conf->assoc_capability = capab_info;
1226 ieee80211_set_associated(sdata, cbss, changed);
1227
1228 /*
1229 * If we're using 4-addr mode, let the AP know that we're
1230 * doing so, so that it can create the STA VLAN on its side
1231 */
1232 if (ifmgd->use_4addr)
1233 ieee80211_send_4addr_nullfunc(local, sdata);
1234
1235 /*
1236 * Start timer to probe the connection to the AP now.
1237 * Also start the timer that will detect beacon loss.
1238 */
1239 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1240 mod_beacon_timer(sdata);
1241
1242 return true;
1243 }
1244
1245
1246 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1247 struct ieee80211_mgmt *mgmt,
1248 size_t len,
1249 struct ieee80211_rx_status *rx_status,
1250 struct ieee802_11_elems *elems,
1251 bool beacon)
1252 {
1253 struct ieee80211_local *local = sdata->local;
1254 int freq;
1255 struct ieee80211_bss *bss;
1256 struct ieee80211_channel *channel;
1257 bool need_ps = false;
1258
1259 if (sdata->u.mgd.associated) {
1260 bss = (void *)sdata->u.mgd.associated->priv;
1261 /* not previously set so we may need to recalc */
1262 need_ps = !bss->dtim_period;
1263 }
1264
1265 if (elems->ds_params && elems->ds_params_len == 1)
1266 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1267 else
1268 freq = rx_status->freq;
1269
1270 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1271
1272 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1273 return;
1274
1275 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1276 channel, beacon);
1277 if (bss)
1278 ieee80211_rx_bss_put(local, bss);
1279
1280 if (!sdata->u.mgd.associated)
1281 return;
1282
1283 if (need_ps) {
1284 mutex_lock(&local->iflist_mtx);
1285 ieee80211_recalc_ps(local, -1);
1286 mutex_unlock(&local->iflist_mtx);
1287 }
1288
1289 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1290 (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1291 ETH_ALEN) == 0)) {
1292 struct ieee80211_channel_sw_ie *sw_elem =
1293 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1294 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1295 }
1296 }
1297
1298
1299 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1300 struct sk_buff *skb)
1301 {
1302 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1303 struct ieee80211_if_managed *ifmgd;
1304 struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1305 size_t baselen, len = skb->len;
1306 struct ieee802_11_elems elems;
1307
1308 ifmgd = &sdata->u.mgd;
1309
1310 ASSERT_MGD_MTX(ifmgd);
1311
1312 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1313 return; /* ignore ProbeResp to foreign address */
1314
1315 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1316 if (baselen > len)
1317 return;
1318
1319 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1320 &elems);
1321
1322 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1323
1324 if (ifmgd->associated &&
1325 memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1326 ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1327 IEEE80211_STA_CONNECTION_POLL)) {
1328 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1329 IEEE80211_STA_BEACON_POLL);
1330 mutex_lock(&sdata->local->iflist_mtx);
1331 ieee80211_recalc_ps(sdata->local, -1);
1332 mutex_unlock(&sdata->local->iflist_mtx);
1333 /*
1334 * We've received a probe response, but are not sure whether
1335 * we have or will be receiving any beacons or data, so let's
1336 * schedule the timers again, just in case.
1337 */
1338 mod_beacon_timer(sdata);
1339 mod_timer(&ifmgd->conn_mon_timer,
1340 round_jiffies_up(jiffies +
1341 IEEE80211_CONNECTION_IDLE_TIME));
1342 }
1343 }
1344
1345 /*
1346 * This is the canonical list of information elements we care about,
1347 * the filter code also gives us all changes to the Microsoft OUI
1348 * (00:50:F2) vendor IE which is used for WMM which we need to track.
1349 *
1350 * We implement beacon filtering in software since that means we can
1351 * avoid processing the frame here and in cfg80211, and userspace
1352 * will not be able to tell whether the hardware supports it or not.
1353 *
1354 * XXX: This list needs to be dynamic -- userspace needs to be able to
1355 * add items it requires. It also needs to be able to tell us to
1356 * look out for other vendor IEs.
1357 */
1358 static const u64 care_about_ies =
1359 (1ULL << WLAN_EID_COUNTRY) |
1360 (1ULL << WLAN_EID_ERP_INFO) |
1361 (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1362 (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1363 (1ULL << WLAN_EID_HT_CAPABILITY) |
1364 (1ULL << WLAN_EID_HT_INFORMATION);
1365
1366 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1367 struct ieee80211_mgmt *mgmt,
1368 size_t len,
1369 struct ieee80211_rx_status *rx_status)
1370 {
1371 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1372 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1373 size_t baselen;
1374 struct ieee802_11_elems elems;
1375 struct ieee80211_local *local = sdata->local;
1376 u32 changed = 0;
1377 bool erp_valid, directed_tim = false;
1378 u8 erp_value = 0;
1379 u32 ncrc;
1380 u8 *bssid;
1381
1382 ASSERT_MGD_MTX(ifmgd);
1383
1384 /* Process beacon from the current BSS */
1385 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1386 if (baselen > len)
1387 return;
1388
1389 if (rx_status->freq != local->hw.conf.channel->center_freq)
1390 return;
1391
1392 /*
1393 * We might have received a number of frames, among them a
1394 * disassoc frame and a beacon...
1395 */
1396 if (!ifmgd->associated)
1397 return;
1398
1399 bssid = ifmgd->associated->bssid;
1400
1401 /*
1402 * And in theory even frames from a different AP we were just
1403 * associated to a split-second ago!
1404 */
1405 if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1406 return;
1407
1408 /* Track average RSSI from the Beacon frames of the current AP */
1409 ifmgd->last_beacon_signal = rx_status->signal;
1410 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1411 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1412 ifmgd->ave_beacon_signal = rx_status->signal;
1413 ifmgd->last_cqm_event_signal = 0;
1414 } else {
1415 ifmgd->ave_beacon_signal =
1416 (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1417 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1418 ifmgd->ave_beacon_signal) / 16;
1419 }
1420 if (bss_conf->cqm_rssi_thold &&
1421 !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1422 int sig = ifmgd->ave_beacon_signal / 16;
1423 int last_event = ifmgd->last_cqm_event_signal;
1424 int thold = bss_conf->cqm_rssi_thold;
1425 int hyst = bss_conf->cqm_rssi_hyst;
1426 if (sig < thold &&
1427 (last_event == 0 || sig < last_event - hyst)) {
1428 ifmgd->last_cqm_event_signal = sig;
1429 ieee80211_cqm_rssi_notify(
1430 &sdata->vif,
1431 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1432 GFP_KERNEL);
1433 } else if (sig > thold &&
1434 (last_event == 0 || sig > last_event + hyst)) {
1435 ifmgd->last_cqm_event_signal = sig;
1436 ieee80211_cqm_rssi_notify(
1437 &sdata->vif,
1438 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1439 GFP_KERNEL);
1440 }
1441 }
1442
1443 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1444 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1445 if (net_ratelimit()) {
1446 printk(KERN_DEBUG "%s: cancelling probereq poll due "
1447 "to a received beacon\n", sdata->name);
1448 }
1449 #endif
1450 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1451 mutex_lock(&local->iflist_mtx);
1452 ieee80211_recalc_ps(local, -1);
1453 mutex_unlock(&local->iflist_mtx);
1454 }
1455
1456 /*
1457 * Push the beacon loss detection into the future since
1458 * we are processing a beacon from the AP just now.
1459 */
1460 mod_beacon_timer(sdata);
1461
1462 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1463 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1464 len - baselen, &elems,
1465 care_about_ies, ncrc);
1466
1467 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1468 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1469 ifmgd->aid);
1470
1471 if (ncrc != ifmgd->beacon_crc) {
1472 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1473 true);
1474
1475 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1476 elems.wmm_param_len);
1477 }
1478
1479 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1480 if (directed_tim) {
1481 if (local->hw.conf.dynamic_ps_timeout > 0) {
1482 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1483 ieee80211_hw_config(local,
1484 IEEE80211_CONF_CHANGE_PS);
1485 ieee80211_send_nullfunc(local, sdata, 0);
1486 } else {
1487 local->pspolling = true;
1488
1489 /*
1490 * Here is assumed that the driver will be
1491 * able to send ps-poll frame and receive a
1492 * response even though power save mode is
1493 * enabled, but some drivers might require
1494 * to disable power save here. This needs
1495 * to be investigated.
1496 */
1497 ieee80211_send_pspoll(local, sdata);
1498 }
1499 }
1500 }
1501
1502 if (ncrc == ifmgd->beacon_crc)
1503 return;
1504 ifmgd->beacon_crc = ncrc;
1505
1506 if (elems.erp_info && elems.erp_info_len >= 1) {
1507 erp_valid = true;
1508 erp_value = elems.erp_info[0];
1509 } else {
1510 erp_valid = false;
1511 }
1512 changed |= ieee80211_handle_bss_capability(sdata,
1513 le16_to_cpu(mgmt->u.beacon.capab_info),
1514 erp_valid, erp_value);
1515
1516
1517 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1518 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1519 struct sta_info *sta;
1520 struct ieee80211_supported_band *sband;
1521 u16 ap_ht_cap_flags;
1522
1523 rcu_read_lock();
1524
1525 sta = sta_info_get(sdata, bssid);
1526 if (WARN_ON(!sta)) {
1527 rcu_read_unlock();
1528 return;
1529 }
1530
1531 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1532
1533 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1534 elems.ht_cap_elem, &sta->sta.ht_cap);
1535
1536 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1537
1538 rcu_read_unlock();
1539
1540 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1541 bssid, ap_ht_cap_flags);
1542 }
1543
1544 /* Note: country IE parsing is done for us by cfg80211 */
1545 if (elems.country_elem) {
1546 /* TODO: IBSS also needs this */
1547 if (elems.pwr_constr_elem)
1548 ieee80211_handle_pwr_constr(sdata,
1549 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1550 elems.pwr_constr_elem,
1551 elems.pwr_constr_elem_len);
1552 }
1553
1554 ieee80211_bss_info_change_notify(sdata, changed);
1555 }
1556
1557 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1558 struct sk_buff *skb)
1559 {
1560 struct ieee80211_local *local = sdata->local;
1561 struct ieee80211_mgmt *mgmt;
1562 u16 fc;
1563
1564 if (skb->len < 24)
1565 return RX_DROP_MONITOR;
1566
1567 mgmt = (struct ieee80211_mgmt *) skb->data;
1568 fc = le16_to_cpu(mgmt->frame_control);
1569
1570 switch (fc & IEEE80211_FCTL_STYPE) {
1571 case IEEE80211_STYPE_PROBE_RESP:
1572 case IEEE80211_STYPE_BEACON:
1573 case IEEE80211_STYPE_DEAUTH:
1574 case IEEE80211_STYPE_DISASSOC:
1575 case IEEE80211_STYPE_ACTION:
1576 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1577 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
1578 return RX_QUEUED;
1579 }
1580
1581 return RX_DROP_MONITOR;
1582 }
1583
1584 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1585 struct sk_buff *skb)
1586 {
1587 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1588 struct ieee80211_rx_status *rx_status;
1589 struct ieee80211_mgmt *mgmt;
1590 enum rx_mgmt_action rma = RX_MGMT_NONE;
1591 u16 fc;
1592
1593 rx_status = (struct ieee80211_rx_status *) skb->cb;
1594 mgmt = (struct ieee80211_mgmt *) skb->data;
1595 fc = le16_to_cpu(mgmt->frame_control);
1596
1597 mutex_lock(&ifmgd->mtx);
1598
1599 if (ifmgd->associated &&
1600 memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1601 switch (fc & IEEE80211_FCTL_STYPE) {
1602 case IEEE80211_STYPE_BEACON:
1603 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1604 rx_status);
1605 break;
1606 case IEEE80211_STYPE_PROBE_RESP:
1607 ieee80211_rx_mgmt_probe_resp(sdata, skb);
1608 break;
1609 case IEEE80211_STYPE_DEAUTH:
1610 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1611 break;
1612 case IEEE80211_STYPE_DISASSOC:
1613 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1614 break;
1615 case IEEE80211_STYPE_ACTION:
1616 if (mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
1617 break;
1618
1619 ieee80211_sta_process_chanswitch(sdata,
1620 &mgmt->u.action.u.chan_switch.sw_elem,
1621 (void *)ifmgd->associated->priv);
1622 break;
1623 }
1624 mutex_unlock(&ifmgd->mtx);
1625
1626 switch (rma) {
1627 case RX_MGMT_NONE:
1628 /* no action */
1629 break;
1630 case RX_MGMT_CFG80211_DEAUTH:
1631 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1632 break;
1633 case RX_MGMT_CFG80211_DISASSOC:
1634 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1635 break;
1636 default:
1637 WARN(1, "unexpected: %d", rma);
1638 }
1639 goto out;
1640 }
1641
1642 mutex_unlock(&ifmgd->mtx);
1643
1644 if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1645 (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH)
1646 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1647
1648 out:
1649 kfree_skb(skb);
1650 }
1651
1652 static void ieee80211_sta_timer(unsigned long data)
1653 {
1654 struct ieee80211_sub_if_data *sdata =
1655 (struct ieee80211_sub_if_data *) data;
1656 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1657 struct ieee80211_local *local = sdata->local;
1658
1659 if (local->quiescing) {
1660 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1661 return;
1662 }
1663
1664 ieee80211_queue_work(&local->hw, &ifmgd->work);
1665 }
1666
1667 static void ieee80211_sta_work(struct work_struct *work)
1668 {
1669 struct ieee80211_sub_if_data *sdata =
1670 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1671 struct ieee80211_local *local = sdata->local;
1672 struct ieee80211_if_managed *ifmgd;
1673 struct sk_buff *skb;
1674
1675 if (!ieee80211_sdata_running(sdata))
1676 return;
1677
1678 if (local->scanning)
1679 return;
1680
1681 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1682 return;
1683
1684 /*
1685 * ieee80211_queue_work() should have picked up most cases,
1686 * here we'll pick the the rest.
1687 */
1688 if (WARN(local->suspended, "STA MLME work scheduled while "
1689 "going to suspend\n"))
1690 return;
1691
1692 ifmgd = &sdata->u.mgd;
1693
1694 /* first process frames to avoid timing out while a frame is pending */
1695 while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1696 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1697
1698 /* then process the rest of the work */
1699 mutex_lock(&ifmgd->mtx);
1700
1701 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1702 IEEE80211_STA_CONNECTION_POLL) &&
1703 ifmgd->associated) {
1704 u8 bssid[ETH_ALEN];
1705
1706 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1707 if (time_is_after_jiffies(ifmgd->probe_timeout))
1708 run_again(ifmgd, ifmgd->probe_timeout);
1709
1710 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1711 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1712 printk(KERN_DEBUG "No probe response from AP %pM"
1713 " after %dms, try %d\n", bssid,
1714 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1715 ifmgd->probe_send_count);
1716 #endif
1717 ieee80211_mgd_probe_ap_send(sdata);
1718 } else {
1719 /*
1720 * We actually lost the connection ... or did we?
1721 * Let's make sure!
1722 */
1723 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1724 IEEE80211_STA_BEACON_POLL);
1725 printk(KERN_DEBUG "No probe response from AP %pM"
1726 " after %dms, disconnecting.\n",
1727 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1728 ieee80211_set_disassoc(sdata, true);
1729 ieee80211_recalc_idle(local);
1730 mutex_unlock(&ifmgd->mtx);
1731 /*
1732 * must be outside lock due to cfg80211,
1733 * but that's not a problem.
1734 */
1735 ieee80211_send_deauth_disassoc(sdata, bssid,
1736 IEEE80211_STYPE_DEAUTH,
1737 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1738 NULL, true);
1739 mutex_lock(&ifmgd->mtx);
1740 }
1741 }
1742
1743 mutex_unlock(&ifmgd->mtx);
1744 }
1745
1746 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1747 {
1748 struct ieee80211_sub_if_data *sdata =
1749 (struct ieee80211_sub_if_data *) data;
1750 struct ieee80211_local *local = sdata->local;
1751
1752 if (local->quiescing)
1753 return;
1754
1755 ieee80211_queue_work(&sdata->local->hw,
1756 &sdata->u.mgd.beacon_connection_loss_work);
1757 }
1758
1759 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1760 {
1761 struct ieee80211_sub_if_data *sdata =
1762 (struct ieee80211_sub_if_data *) data;
1763 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1764 struct ieee80211_local *local = sdata->local;
1765
1766 if (local->quiescing)
1767 return;
1768
1769 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1770 }
1771
1772 static void ieee80211_sta_monitor_work(struct work_struct *work)
1773 {
1774 struct ieee80211_sub_if_data *sdata =
1775 container_of(work, struct ieee80211_sub_if_data,
1776 u.mgd.monitor_work);
1777
1778 ieee80211_mgd_probe_ap(sdata, false);
1779 }
1780
1781 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1782 {
1783 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1784 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1785 IEEE80211_STA_CONNECTION_POLL);
1786
1787 /* let's probe the connection once */
1788 ieee80211_queue_work(&sdata->local->hw,
1789 &sdata->u.mgd.monitor_work);
1790 /* and do all the other regular work too */
1791 ieee80211_queue_work(&sdata->local->hw,
1792 &sdata->u.mgd.work);
1793 }
1794 }
1795
1796 #ifdef CONFIG_PM
1797 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1798 {
1799 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1800
1801 /*
1802 * we need to use atomic bitops for the running bits
1803 * only because both timers might fire at the same
1804 * time -- the code here is properly synchronised.
1805 */
1806
1807 cancel_work_sync(&ifmgd->work);
1808 cancel_work_sync(&ifmgd->beacon_connection_loss_work);
1809 if (del_timer_sync(&ifmgd->timer))
1810 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1811
1812 cancel_work_sync(&ifmgd->chswitch_work);
1813 if (del_timer_sync(&ifmgd->chswitch_timer))
1814 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1815
1816 cancel_work_sync(&ifmgd->monitor_work);
1817 /* these will just be re-established on connection */
1818 del_timer_sync(&ifmgd->conn_mon_timer);
1819 del_timer_sync(&ifmgd->bcn_mon_timer);
1820 }
1821
1822 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1823 {
1824 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1825
1826 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1827 add_timer(&ifmgd->timer);
1828 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1829 add_timer(&ifmgd->chswitch_timer);
1830 }
1831 #endif
1832
1833 /* interface setup */
1834 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1835 {
1836 struct ieee80211_if_managed *ifmgd;
1837
1838 ifmgd = &sdata->u.mgd;
1839 INIT_WORK(&ifmgd->work, ieee80211_sta_work);
1840 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1841 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1842 INIT_WORK(&ifmgd->beacon_connection_loss_work,
1843 ieee80211_beacon_connection_loss_work);
1844 setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1845 (unsigned long) sdata);
1846 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1847 (unsigned long) sdata);
1848 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1849 (unsigned long) sdata);
1850 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1851 (unsigned long) sdata);
1852 skb_queue_head_init(&ifmgd->skb_queue);
1853
1854 ifmgd->flags = 0;
1855
1856 mutex_init(&ifmgd->mtx);
1857
1858 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1859 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1860 else
1861 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1862 }
1863
1864 /* scan finished notification */
1865 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1866 {
1867 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1868
1869 /* Restart STA timers */
1870 rcu_read_lock();
1871 list_for_each_entry_rcu(sdata, &local->interfaces, list)
1872 ieee80211_restart_sta_timer(sdata);
1873 rcu_read_unlock();
1874 }
1875
1876 int ieee80211_max_network_latency(struct notifier_block *nb,
1877 unsigned long data, void *dummy)
1878 {
1879 s32 latency_usec = (s32) data;
1880 struct ieee80211_local *local =
1881 container_of(nb, struct ieee80211_local,
1882 network_latency_notifier);
1883
1884 mutex_lock(&local->iflist_mtx);
1885 ieee80211_recalc_ps(local, latency_usec);
1886 mutex_unlock(&local->iflist_mtx);
1887
1888 return 0;
1889 }
1890
1891 /* config hooks */
1892 static enum work_done_result
1893 ieee80211_probe_auth_done(struct ieee80211_work *wk,
1894 struct sk_buff *skb)
1895 {
1896 if (!skb) {
1897 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
1898 return WORK_DONE_DESTROY;
1899 }
1900
1901 if (wk->type == IEEE80211_WORK_AUTH) {
1902 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
1903 return WORK_DONE_DESTROY;
1904 }
1905
1906 mutex_lock(&wk->sdata->u.mgd.mtx);
1907 ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
1908 mutex_unlock(&wk->sdata->u.mgd.mtx);
1909
1910 wk->type = IEEE80211_WORK_AUTH;
1911 wk->probe_auth.tries = 0;
1912 return WORK_DONE_REQUEUE;
1913 }
1914
1915 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
1916 struct cfg80211_auth_request *req)
1917 {
1918 const u8 *ssid;
1919 struct ieee80211_work *wk;
1920 u16 auth_alg;
1921
1922 if (req->local_state_change)
1923 return 0; /* no need to update mac80211 state */
1924
1925 switch (req->auth_type) {
1926 case NL80211_AUTHTYPE_OPEN_SYSTEM:
1927 auth_alg = WLAN_AUTH_OPEN;
1928 break;
1929 case NL80211_AUTHTYPE_SHARED_KEY:
1930 auth_alg = WLAN_AUTH_SHARED_KEY;
1931 break;
1932 case NL80211_AUTHTYPE_FT:
1933 auth_alg = WLAN_AUTH_FT;
1934 break;
1935 case NL80211_AUTHTYPE_NETWORK_EAP:
1936 auth_alg = WLAN_AUTH_LEAP;
1937 break;
1938 default:
1939 return -EOPNOTSUPP;
1940 }
1941
1942 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1943 if (!wk)
1944 return -ENOMEM;
1945
1946 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1947
1948 if (req->ie && req->ie_len) {
1949 memcpy(wk->ie, req->ie, req->ie_len);
1950 wk->ie_len = req->ie_len;
1951 }
1952
1953 if (req->key && req->key_len) {
1954 wk->probe_auth.key_len = req->key_len;
1955 wk->probe_auth.key_idx = req->key_idx;
1956 memcpy(wk->probe_auth.key, req->key, req->key_len);
1957 }
1958
1959 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1960 memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
1961 wk->probe_auth.ssid_len = ssid[1];
1962
1963 wk->probe_auth.algorithm = auth_alg;
1964 wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
1965
1966 /* if we already have a probe, don't probe again */
1967 if (req->bss->proberesp_ies)
1968 wk->type = IEEE80211_WORK_AUTH;
1969 else
1970 wk->type = IEEE80211_WORK_DIRECT_PROBE;
1971 wk->chan = req->bss->channel;
1972 wk->sdata = sdata;
1973 wk->done = ieee80211_probe_auth_done;
1974
1975 ieee80211_add_work(wk);
1976 return 0;
1977 }
1978
1979 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
1980 struct sk_buff *skb)
1981 {
1982 struct ieee80211_mgmt *mgmt;
1983 u16 status;
1984
1985 if (!skb) {
1986 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
1987 return WORK_DONE_DESTROY;
1988 }
1989
1990 mgmt = (void *)skb->data;
1991 status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1992
1993 if (status == WLAN_STATUS_SUCCESS) {
1994 mutex_lock(&wk->sdata->u.mgd.mtx);
1995 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
1996 mutex_unlock(&wk->sdata->u.mgd.mtx);
1997 /* oops -- internal error -- send timeout for now */
1998 cfg80211_send_assoc_timeout(wk->sdata->dev,
1999 wk->filter_ta);
2000 return WORK_DONE_DESTROY;
2001 }
2002 mutex_unlock(&wk->sdata->u.mgd.mtx);
2003 }
2004
2005 cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2006 return WORK_DONE_DESTROY;
2007 }
2008
2009 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2010 struct cfg80211_assoc_request *req)
2011 {
2012 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2013 struct ieee80211_bss *bss = (void *)req->bss->priv;
2014 struct ieee80211_work *wk;
2015 const u8 *ssid;
2016 int i;
2017
2018 mutex_lock(&ifmgd->mtx);
2019 if (ifmgd->associated) {
2020 if (!req->prev_bssid ||
2021 memcmp(req->prev_bssid, ifmgd->associated->bssid,
2022 ETH_ALEN)) {
2023 /*
2024 * We are already associated and the request was not a
2025 * reassociation request from the current BSS, so
2026 * reject it.
2027 */
2028 mutex_unlock(&ifmgd->mtx);
2029 return -EALREADY;
2030 }
2031
2032 /* Trying to reassociate - clear previous association state */
2033 ieee80211_set_disassoc(sdata, true);
2034 }
2035 mutex_unlock(&ifmgd->mtx);
2036
2037 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2038 if (!wk)
2039 return -ENOMEM;
2040
2041 ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2042 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2043
2044 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2045 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2046 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2047 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2048 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2049
2050
2051 if (req->ie && req->ie_len) {
2052 memcpy(wk->ie, req->ie, req->ie_len);
2053 wk->ie_len = req->ie_len;
2054 } else
2055 wk->ie_len = 0;
2056
2057 wk->assoc.bss = req->bss;
2058
2059 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2060
2061 /* new association always uses requested smps mode */
2062 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2063 if (ifmgd->powersave)
2064 ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2065 else
2066 ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2067 } else
2068 ifmgd->ap_smps = ifmgd->req_smps;
2069
2070 wk->assoc.smps = ifmgd->ap_smps;
2071 /*
2072 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2073 * We still associate in non-HT mode (11a/b/g) if any one of these
2074 * ciphers is configured as pairwise.
2075 * We can set this to true for non-11n hardware, that'll be checked
2076 * separately along with the peer capabilities.
2077 */
2078 wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2079 wk->assoc.capability = req->bss->capability;
2080 wk->assoc.wmm_used = bss->wmm_used;
2081 wk->assoc.supp_rates = bss->supp_rates;
2082 wk->assoc.supp_rates_len = bss->supp_rates_len;
2083 wk->assoc.ht_information_ie =
2084 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2085
2086 if (bss->wmm_used && bss->uapsd_supported &&
2087 (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2088 wk->assoc.uapsd_used = true;
2089 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2090 } else {
2091 wk->assoc.uapsd_used = false;
2092 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2093 }
2094
2095 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2096 memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2097 wk->assoc.ssid_len = ssid[1];
2098
2099 if (req->prev_bssid)
2100 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2101
2102 wk->type = IEEE80211_WORK_ASSOC;
2103 wk->chan = req->bss->channel;
2104 wk->sdata = sdata;
2105 wk->done = ieee80211_assoc_done;
2106
2107 if (req->use_mfp) {
2108 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2109 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2110 } else {
2111 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2112 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2113 }
2114
2115 if (req->crypto.control_port)
2116 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2117 else
2118 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2119
2120 ieee80211_add_work(wk);
2121 return 0;
2122 }
2123
2124 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2125 struct cfg80211_deauth_request *req,
2126 void *cookie)
2127 {
2128 struct ieee80211_local *local = sdata->local;
2129 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2130 struct ieee80211_work *wk;
2131 const u8 *bssid = req->bss->bssid;
2132
2133 mutex_lock(&ifmgd->mtx);
2134
2135 if (ifmgd->associated == req->bss) {
2136 bssid = req->bss->bssid;
2137 ieee80211_set_disassoc(sdata, true);
2138 mutex_unlock(&ifmgd->mtx);
2139 } else {
2140 bool not_auth_yet = false;
2141
2142 mutex_unlock(&ifmgd->mtx);
2143
2144 mutex_lock(&local->work_mtx);
2145 list_for_each_entry(wk, &local->work_list, list) {
2146 if (wk->sdata != sdata)
2147 continue;
2148
2149 if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2150 wk->type != IEEE80211_WORK_AUTH)
2151 continue;
2152
2153 if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2154 continue;
2155
2156 not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2157 list_del_rcu(&wk->list);
2158 free_work(wk);
2159 break;
2160 }
2161 mutex_unlock(&local->work_mtx);
2162
2163 /*
2164 * If somebody requests authentication and we haven't
2165 * sent out an auth frame yet there's no need to send
2166 * out a deauth frame either. If the state was PROBE,
2167 * then this is the case. If it's AUTH we have sent a
2168 * frame, and if it's IDLE we have completed the auth
2169 * process already.
2170 */
2171 if (not_auth_yet) {
2172 __cfg80211_auth_canceled(sdata->dev, bssid);
2173 return 0;
2174 }
2175 }
2176
2177 printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2178 sdata->name, bssid, req->reason_code);
2179
2180 ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2181 req->reason_code, cookie,
2182 !req->local_state_change);
2183
2184 ieee80211_recalc_idle(sdata->local);
2185
2186 return 0;
2187 }
2188
2189 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2190 struct cfg80211_disassoc_request *req,
2191 void *cookie)
2192 {
2193 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2194 u8 bssid[ETH_ALEN];
2195
2196 mutex_lock(&ifmgd->mtx);
2197
2198 /*
2199 * cfg80211 should catch this ... but it's racy since
2200 * we can receive a disassoc frame, process it, hand it
2201 * to cfg80211 while that's in a locked section already
2202 * trying to tell us that the user wants to disconnect.
2203 */
2204 if (ifmgd->associated != req->bss) {
2205 mutex_unlock(&ifmgd->mtx);
2206 return -ENOLINK;
2207 }
2208
2209 printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2210 sdata->name, req->bss->bssid, req->reason_code);
2211
2212 memcpy(bssid, req->bss->bssid, ETH_ALEN);
2213 ieee80211_set_disassoc(sdata, false);
2214
2215 mutex_unlock(&ifmgd->mtx);
2216
2217 ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2218 IEEE80211_STYPE_DISASSOC, req->reason_code,
2219 cookie, !req->local_state_change);
2220 sta_info_destroy_addr(sdata, bssid);
2221
2222 ieee80211_recalc_idle(sdata->local);
2223
2224 return 0;
2225 }
2226
2227 int ieee80211_mgd_action(struct ieee80211_sub_if_data *sdata,
2228 struct ieee80211_channel *chan,
2229 enum nl80211_channel_type channel_type,
2230 const u8 *buf, size_t len, u64 *cookie)
2231 {
2232 struct ieee80211_local *local = sdata->local;
2233 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2234 struct sk_buff *skb;
2235
2236 /* Check that we are on the requested channel for transmission */
2237 if ((chan != local->tmp_channel ||
2238 channel_type != local->tmp_channel_type) &&
2239 (chan != local->oper_channel ||
2240 channel_type != local->oper_channel_type))
2241 return -EBUSY;
2242
2243 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len);
2244 if (!skb)
2245 return -ENOMEM;
2246 skb_reserve(skb, local->hw.extra_tx_headroom);
2247
2248 memcpy(skb_put(skb, len), buf, len);
2249
2250 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
2251 IEEE80211_SKB_CB(skb)->flags |=
2252 IEEE80211_TX_INTFL_DONT_ENCRYPT;
2253 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX |
2254 IEEE80211_TX_CTL_REQ_TX_STATUS;
2255 skb->dev = sdata->dev;
2256 ieee80211_tx_skb(sdata, skb);
2257
2258 *cookie = (unsigned long) skb;
2259 return 0;
2260 }
2261
2262 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2263 enum nl80211_cqm_rssi_threshold_event rssi_event,
2264 gfp_t gfp)
2265 {
2266 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2267
2268 trace_api_cqm_rssi_notify(sdata, rssi_event);
2269
2270 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2271 }
2272 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
Linux kernel - Deliverables
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