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Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
[deliverable/linux.git] / net / mac80211 / mlme.c
1 /*
2 * BSS client mode implementation
3 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4 * Copyright 2004, Instant802 Networks, Inc.
5 * Copyright 2005, Devicescape Software, Inc.
6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14 #include <linux/delay.h>
15 #include <linux/if_ether.h>
16 #include <linux/skbuff.h>
17 #include <linux/if_arp.h>
18 #include <linux/etherdevice.h>
19 #include <linux/rtnetlink.h>
20 #include <linux/pm_qos_params.h>
21 #include <linux/crc32.h>
22 #include <linux/slab.h>
23 #include <net/mac80211.h>
24 #include <asm/unaligned.h>
25
26 #include "ieee80211_i.h"
27 #include "driver-ops.h"
28 #include "rate.h"
29 #include "led.h"
30
31 #define IEEE80211_MAX_PROBE_TRIES 5
32
33 /*
34 * beacon loss detection timeout
35 * XXX: should depend on beacon interval
36 */
37 #define IEEE80211_BEACON_LOSS_TIME (2 * HZ)
38 /*
39 * Time the connection can be idle before we probe
40 * it to see if we can still talk to the AP.
41 */
42 #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ)
43 /*
44 * Time we wait for a probe response after sending
45 * a probe request because of beacon loss or for
46 * checking the connection still works.
47 */
48 #define IEEE80211_PROBE_WAIT (HZ / 2)
49
50 /*
51 * Weight given to the latest Beacon frame when calculating average signal
52 * strength for Beacon frames received in the current BSS. This must be
53 * between 1 and 15.
54 */
55 #define IEEE80211_SIGNAL_AVE_WEIGHT 3
56
57 #define TMR_RUNNING_TIMER 0
58 #define TMR_RUNNING_CHANSW 1
59
60 /*
61 * All cfg80211 functions have to be called outside a locked
62 * section so that they can acquire a lock themselves... This
63 * is much simpler than queuing up things in cfg80211, but we
64 * do need some indirection for that here.
65 */
66 enum rx_mgmt_action {
67 /* no action required */
68 RX_MGMT_NONE,
69
70 /* caller must call cfg80211_send_rx_auth() */
71 RX_MGMT_CFG80211_AUTH,
72
73 /* caller must call cfg80211_send_rx_assoc() */
74 RX_MGMT_CFG80211_ASSOC,
75
76 /* caller must call cfg80211_send_deauth() */
77 RX_MGMT_CFG80211_DEAUTH,
78
79 /* caller must call cfg80211_send_disassoc() */
80 RX_MGMT_CFG80211_DISASSOC,
81
82 /* caller must tell cfg80211 about internal error */
83 RX_MGMT_CFG80211_ASSOC_ERROR,
84 };
85
86 /* utils */
87 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
88 {
89 WARN_ON(!mutex_is_locked(&ifmgd->mtx));
90 }
91
92 /*
93 * We can have multiple work items (and connection probing)
94 * scheduling this timer, but we need to take care to only
95 * reschedule it when it should fire _earlier_ than it was
96 * asked for before, or if it's not pending right now. This
97 * function ensures that. Note that it then is required to
98 * run this function for all timeouts after the first one
99 * has happened -- the work that runs from this timer will
100 * do that.
101 */
102 static void run_again(struct ieee80211_if_managed *ifmgd,
103 unsigned long timeout)
104 {
105 ASSERT_MGD_MTX(ifmgd);
106
107 if (!timer_pending(&ifmgd->timer) ||
108 time_before(timeout, ifmgd->timer.expires))
109 mod_timer(&ifmgd->timer, timeout);
110 }
111
112 static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata)
113 {
114 if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
115 return;
116
117 mod_timer(&sdata->u.mgd.bcn_mon_timer,
118 round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME));
119 }
120
121 static int ecw2cw(int ecw)
122 {
123 return (1 << ecw) - 1;
124 }
125
126 /*
127 * ieee80211_enable_ht should be called only after the operating band
128 * has been determined as ht configuration depends on the hw's
129 * HT abilities for a specific band.
130 */
131 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
132 struct ieee80211_ht_info *hti,
133 const u8 *bssid, u16 ap_ht_cap_flags)
134 {
135 struct ieee80211_local *local = sdata->local;
136 struct ieee80211_supported_band *sband;
137 struct sta_info *sta;
138 u32 changed = 0;
139 u16 ht_opmode;
140 bool enable_ht = true, ht_changed;
141 enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
142
143 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
144
145 /* HT is not supported */
146 if (!sband->ht_cap.ht_supported)
147 enable_ht = false;
148
149 /* check that channel matches the right operating channel */
150 if (local->hw.conf.channel->center_freq !=
151 ieee80211_channel_to_frequency(hti->control_chan))
152 enable_ht = false;
153
154 if (enable_ht) {
155 channel_type = NL80211_CHAN_HT20;
156
157 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
158 (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
159 (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
160 switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
161 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
162 if (!(local->hw.conf.channel->flags &
163 IEEE80211_CHAN_NO_HT40PLUS))
164 channel_type = NL80211_CHAN_HT40PLUS;
165 break;
166 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
167 if (!(local->hw.conf.channel->flags &
168 IEEE80211_CHAN_NO_HT40MINUS))
169 channel_type = NL80211_CHAN_HT40MINUS;
170 break;
171 }
172 }
173 }
174
175 ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
176 channel_type != local->hw.conf.channel_type;
177
178 if (local->tmp_channel)
179 local->tmp_channel_type = channel_type;
180 local->oper_channel_type = channel_type;
181
182 if (ht_changed) {
183 /* channel_type change automatically detected */
184 ieee80211_hw_config(local, 0);
185
186 rcu_read_lock();
187 sta = sta_info_get(sdata, bssid);
188 if (sta)
189 rate_control_rate_update(local, sband, sta,
190 IEEE80211_RC_HT_CHANGED,
191 local->oper_channel_type);
192 rcu_read_unlock();
193 }
194
195 /* disable HT */
196 if (!enable_ht)
197 return 0;
198
199 ht_opmode = le16_to_cpu(hti->operation_mode);
200
201 /* if bss configuration changed store the new one */
202 if (!sdata->ht_opmode_valid ||
203 sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
204 changed |= BSS_CHANGED_HT;
205 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
206 sdata->ht_opmode_valid = true;
207 }
208
209 return changed;
210 }
211
212 /* frame sending functions */
213
214 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
215 const u8 *bssid, u16 stype, u16 reason,
216 void *cookie, bool send_frame)
217 {
218 struct ieee80211_local *local = sdata->local;
219 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
220 struct sk_buff *skb;
221 struct ieee80211_mgmt *mgmt;
222
223 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
224 if (!skb) {
225 printk(KERN_DEBUG "%s: failed to allocate buffer for "
226 "deauth/disassoc frame\n", sdata->name);
227 return;
228 }
229 skb_reserve(skb, local->hw.extra_tx_headroom);
230
231 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
232 memset(mgmt, 0, 24);
233 memcpy(mgmt->da, bssid, ETH_ALEN);
234 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
235 memcpy(mgmt->bssid, bssid, ETH_ALEN);
236 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
237 skb_put(skb, 2);
238 /* u.deauth.reason_code == u.disassoc.reason_code */
239 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
240
241 if (stype == IEEE80211_STYPE_DEAUTH)
242 if (cookie)
243 __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
244 else
245 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
246 else
247 if (cookie)
248 __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
249 else
250 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
251 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
252 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
253
254 if (send_frame)
255 ieee80211_tx_skb(sdata, skb);
256 else
257 kfree_skb(skb);
258 }
259
260 void ieee80211_send_pspoll(struct ieee80211_local *local,
261 struct ieee80211_sub_if_data *sdata)
262 {
263 struct ieee80211_pspoll *pspoll;
264 struct sk_buff *skb;
265
266 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
267 if (!skb)
268 return;
269
270 pspoll = (struct ieee80211_pspoll *) skb->data;
271 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
272
273 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
274 ieee80211_tx_skb(sdata, skb);
275 }
276
277 void ieee80211_send_nullfunc(struct ieee80211_local *local,
278 struct ieee80211_sub_if_data *sdata,
279 int powersave)
280 {
281 struct sk_buff *skb;
282 struct ieee80211_hdr_3addr *nullfunc;
283
284 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
285 if (!skb)
286 return;
287
288 nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
289 if (powersave)
290 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
291
292 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
293 ieee80211_tx_skb(sdata, skb);
294 }
295
296 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
297 struct ieee80211_sub_if_data *sdata)
298 {
299 struct sk_buff *skb;
300 struct ieee80211_hdr *nullfunc;
301 __le16 fc;
302
303 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
304 return;
305
306 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
307 if (!skb) {
308 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
309 "nullfunc frame\n", sdata->name);
310 return;
311 }
312 skb_reserve(skb, local->hw.extra_tx_headroom);
313
314 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
315 memset(nullfunc, 0, 30);
316 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
317 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
318 nullfunc->frame_control = fc;
319 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
320 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
321 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
322 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
323
324 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
325 ieee80211_tx_skb(sdata, skb);
326 }
327
328 /* spectrum management related things */
329 static void ieee80211_chswitch_work(struct work_struct *work)
330 {
331 struct ieee80211_sub_if_data *sdata =
332 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
333 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
334
335 if (!ieee80211_sdata_running(sdata))
336 return;
337
338 mutex_lock(&ifmgd->mtx);
339 if (!ifmgd->associated)
340 goto out;
341
342 sdata->local->oper_channel = sdata->local->csa_channel;
343 ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL);
344
345 /* XXX: shouldn't really modify cfg80211-owned data! */
346 ifmgd->associated->channel = sdata->local->oper_channel;
347
348 ieee80211_wake_queues_by_reason(&sdata->local->hw,
349 IEEE80211_QUEUE_STOP_REASON_CSA);
350 out:
351 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
352 mutex_unlock(&ifmgd->mtx);
353 }
354
355 static void ieee80211_chswitch_timer(unsigned long data)
356 {
357 struct ieee80211_sub_if_data *sdata =
358 (struct ieee80211_sub_if_data *) data;
359 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
360
361 if (sdata->local->quiescing) {
362 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
363 return;
364 }
365
366 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
367 }
368
369 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
370 struct ieee80211_channel_sw_ie *sw_elem,
371 struct ieee80211_bss *bss)
372 {
373 struct cfg80211_bss *cbss =
374 container_of((void *)bss, struct cfg80211_bss, priv);
375 struct ieee80211_channel *new_ch;
376 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
377 int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
378
379 ASSERT_MGD_MTX(ifmgd);
380
381 if (!ifmgd->associated)
382 return;
383
384 if (sdata->local->scanning)
385 return;
386
387 /* Disregard subsequent beacons if we are already running a timer
388 processing a CSA */
389
390 if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
391 return;
392
393 new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
394 if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
395 return;
396
397 sdata->local->csa_channel = new_ch;
398
399 if (sw_elem->count <= 1) {
400 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
401 } else {
402 ieee80211_stop_queues_by_reason(&sdata->local->hw,
403 IEEE80211_QUEUE_STOP_REASON_CSA);
404 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
405 mod_timer(&ifmgd->chswitch_timer,
406 jiffies +
407 msecs_to_jiffies(sw_elem->count *
408 cbss->beacon_interval));
409 }
410 }
411
412 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
413 u16 capab_info, u8 *pwr_constr_elem,
414 u8 pwr_constr_elem_len)
415 {
416 struct ieee80211_conf *conf = &sdata->local->hw.conf;
417
418 if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
419 return;
420
421 /* Power constraint IE length should be 1 octet */
422 if (pwr_constr_elem_len != 1)
423 return;
424
425 if ((*pwr_constr_elem <= conf->channel->max_power) &&
426 (*pwr_constr_elem != sdata->local->power_constr_level)) {
427 sdata->local->power_constr_level = *pwr_constr_elem;
428 ieee80211_hw_config(sdata->local, 0);
429 }
430 }
431
432 /* powersave */
433 static void ieee80211_enable_ps(struct ieee80211_local *local,
434 struct ieee80211_sub_if_data *sdata)
435 {
436 struct ieee80211_conf *conf = &local->hw.conf;
437
438 /*
439 * If we are scanning right now then the parameters will
440 * take effect when scan finishes.
441 */
442 if (local->scanning)
443 return;
444
445 if (conf->dynamic_ps_timeout > 0 &&
446 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
447 mod_timer(&local->dynamic_ps_timer, jiffies +
448 msecs_to_jiffies(conf->dynamic_ps_timeout));
449 } else {
450 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
451 ieee80211_send_nullfunc(local, sdata, 1);
452
453 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
454 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
455 return;
456
457 conf->flags |= IEEE80211_CONF_PS;
458 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
459 }
460 }
461
462 static void ieee80211_change_ps(struct ieee80211_local *local)
463 {
464 struct ieee80211_conf *conf = &local->hw.conf;
465
466 if (local->ps_sdata) {
467 ieee80211_enable_ps(local, local->ps_sdata);
468 } else if (conf->flags & IEEE80211_CONF_PS) {
469 conf->flags &= ~IEEE80211_CONF_PS;
470 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
471 del_timer_sync(&local->dynamic_ps_timer);
472 cancel_work_sync(&local->dynamic_ps_enable_work);
473 }
474 }
475
476 /* need to hold RTNL or interface lock */
477 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
478 {
479 struct ieee80211_sub_if_data *sdata, *found = NULL;
480 int count = 0;
481
482 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
483 local->ps_sdata = NULL;
484 return;
485 }
486
487 if (!list_empty(&local->work_list)) {
488 local->ps_sdata = NULL;
489 goto change;
490 }
491
492 list_for_each_entry(sdata, &local->interfaces, list) {
493 if (!ieee80211_sdata_running(sdata))
494 continue;
495 if (sdata->vif.type != NL80211_IFTYPE_STATION)
496 continue;
497 found = sdata;
498 count++;
499 }
500
501 if (count == 1 && found->u.mgd.powersave &&
502 found->u.mgd.associated &&
503 found->u.mgd.associated->beacon_ies &&
504 !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
505 IEEE80211_STA_CONNECTION_POLL))) {
506 s32 beaconint_us;
507
508 if (latency < 0)
509 latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
510
511 beaconint_us = ieee80211_tu_to_usec(
512 found->vif.bss_conf.beacon_int);
513
514 if (beaconint_us > latency) {
515 local->ps_sdata = NULL;
516 } else {
517 struct ieee80211_bss *bss;
518 int maxslp = 1;
519 u8 dtimper;
520
521 bss = (void *)found->u.mgd.associated->priv;
522 dtimper = bss->dtim_period;
523
524 /* If the TIM IE is invalid, pretend the value is 1 */
525 if (!dtimper)
526 dtimper = 1;
527 else if (dtimper > 1)
528 maxslp = min_t(int, dtimper,
529 latency / beaconint_us);
530
531 local->hw.conf.max_sleep_period = maxslp;
532 local->hw.conf.ps_dtim_period = dtimper;
533 local->ps_sdata = found;
534 }
535 } else {
536 local->ps_sdata = NULL;
537 }
538
539 change:
540 ieee80211_change_ps(local);
541 }
542
543 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
544 {
545 struct ieee80211_local *local =
546 container_of(work, struct ieee80211_local,
547 dynamic_ps_disable_work);
548
549 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
550 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
551 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
552 }
553
554 ieee80211_wake_queues_by_reason(&local->hw,
555 IEEE80211_QUEUE_STOP_REASON_PS);
556 }
557
558 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
559 {
560 struct ieee80211_local *local =
561 container_of(work, struct ieee80211_local,
562 dynamic_ps_enable_work);
563 struct ieee80211_sub_if_data *sdata = local->ps_sdata;
564 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
565
566 /* can only happen when PS was just disabled anyway */
567 if (!sdata)
568 return;
569
570 if (local->hw.conf.flags & IEEE80211_CONF_PS)
571 return;
572
573 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
574 (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
575 ieee80211_send_nullfunc(local, sdata, 1);
576
577 if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
578 (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
579 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
580 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
581 local->hw.conf.flags |= IEEE80211_CONF_PS;
582 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
583 }
584 }
585
586 void ieee80211_dynamic_ps_timer(unsigned long data)
587 {
588 struct ieee80211_local *local = (void *) data;
589
590 if (local->quiescing || local->suspended)
591 return;
592
593 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
594 }
595
596 /* MLME */
597 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
598 struct ieee80211_if_managed *ifmgd,
599 u8 *wmm_param, size_t wmm_param_len)
600 {
601 struct ieee80211_tx_queue_params params;
602 size_t left;
603 int count;
604 u8 *pos, uapsd_queues = 0;
605
606 if (!local->ops->conf_tx)
607 return;
608
609 if (local->hw.queues < 4)
610 return;
611
612 if (!wmm_param)
613 return;
614
615 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
616 return;
617
618 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
619 uapsd_queues = local->uapsd_queues;
620
621 count = wmm_param[6] & 0x0f;
622 if (count == ifmgd->wmm_last_param_set)
623 return;
624 ifmgd->wmm_last_param_set = count;
625
626 pos = wmm_param + 8;
627 left = wmm_param_len - 8;
628
629 memset(&params, 0, sizeof(params));
630
631 local->wmm_acm = 0;
632 for (; left >= 4; left -= 4, pos += 4) {
633 int aci = (pos[0] >> 5) & 0x03;
634 int acm = (pos[0] >> 4) & 0x01;
635 bool uapsd = false;
636 int queue;
637
638 switch (aci) {
639 case 1: /* AC_BK */
640 queue = 3;
641 if (acm)
642 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
643 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
644 uapsd = true;
645 break;
646 case 2: /* AC_VI */
647 queue = 1;
648 if (acm)
649 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
650 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
651 uapsd = true;
652 break;
653 case 3: /* AC_VO */
654 queue = 0;
655 if (acm)
656 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
657 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
658 uapsd = true;
659 break;
660 case 0: /* AC_BE */
661 default:
662 queue = 2;
663 if (acm)
664 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
665 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
666 uapsd = true;
667 break;
668 }
669
670 params.aifs = pos[0] & 0x0f;
671 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
672 params.cw_min = ecw2cw(pos[1] & 0x0f);
673 params.txop = get_unaligned_le16(pos + 2);
674 params.uapsd = uapsd;
675
676 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
677 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
678 "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
679 wiphy_name(local->hw.wiphy), queue, aci, acm,
680 params.aifs, params.cw_min, params.cw_max, params.txop,
681 params.uapsd);
682 #endif
683 if (drv_conf_tx(local, queue, &params))
684 printk(KERN_DEBUG "%s: failed to set TX queue "
685 "parameters for queue %d\n",
686 wiphy_name(local->hw.wiphy), queue);
687 }
688
689 /* enable WMM or activate new settings */
690 local->hw.conf.flags |= IEEE80211_CONF_QOS;
691 drv_config(local, IEEE80211_CONF_CHANGE_QOS);
692 }
693
694 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
695 u16 capab, bool erp_valid, u8 erp)
696 {
697 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
698 u32 changed = 0;
699 bool use_protection;
700 bool use_short_preamble;
701 bool use_short_slot;
702
703 if (erp_valid) {
704 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
705 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
706 } else {
707 use_protection = false;
708 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
709 }
710
711 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
712 if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
713 use_short_slot = true;
714
715 if (use_protection != bss_conf->use_cts_prot) {
716 bss_conf->use_cts_prot = use_protection;
717 changed |= BSS_CHANGED_ERP_CTS_PROT;
718 }
719
720 if (use_short_preamble != bss_conf->use_short_preamble) {
721 bss_conf->use_short_preamble = use_short_preamble;
722 changed |= BSS_CHANGED_ERP_PREAMBLE;
723 }
724
725 if (use_short_slot != bss_conf->use_short_slot) {
726 bss_conf->use_short_slot = use_short_slot;
727 changed |= BSS_CHANGED_ERP_SLOT;
728 }
729
730 return changed;
731 }
732
733 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
734 struct cfg80211_bss *cbss,
735 u32 bss_info_changed)
736 {
737 struct ieee80211_bss *bss = (void *)cbss->priv;
738 struct ieee80211_local *local = sdata->local;
739
740 bss_info_changed |= BSS_CHANGED_ASSOC;
741 /* set timing information */
742 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
743 sdata->vif.bss_conf.timestamp = cbss->tsf;
744
745 bss_info_changed |= BSS_CHANGED_BEACON_INT;
746 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
747 cbss->capability, bss->has_erp_value, bss->erp_value);
748
749 sdata->u.mgd.associated = cbss;
750 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
751
752 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
753
754 /* just to be sure */
755 sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
756 IEEE80211_STA_BEACON_POLL);
757
758 /*
759 * Always handle WMM once after association regardless
760 * of the first value the AP uses. Setting -1 here has
761 * that effect because the AP values is an unsigned
762 * 4-bit value.
763 */
764 sdata->u.mgd.wmm_last_param_set = -1;
765
766 ieee80211_led_assoc(local, 1);
767
768 sdata->vif.bss_conf.assoc = 1;
769 /*
770 * For now just always ask the driver to update the basic rateset
771 * when we have associated, we aren't checking whether it actually
772 * changed or not.
773 */
774 bss_info_changed |= BSS_CHANGED_BASIC_RATES;
775
776 /* And the BSSID changed - we're associated now */
777 bss_info_changed |= BSS_CHANGED_BSSID;
778
779 /* Tell the driver to monitor connection quality (if supported) */
780 if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
781 sdata->vif.bss_conf.cqm_rssi_thold)
782 bss_info_changed |= BSS_CHANGED_CQM;
783
784 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
785
786 mutex_lock(&local->iflist_mtx);
787 ieee80211_recalc_ps(local, -1);
788 ieee80211_recalc_smps(local, sdata);
789 mutex_unlock(&local->iflist_mtx);
790
791 netif_tx_start_all_queues(sdata->dev);
792 netif_carrier_on(sdata->dev);
793 }
794
795 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
796 bool remove_sta)
797 {
798 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
799 struct ieee80211_local *local = sdata->local;
800 struct sta_info *sta;
801 u32 changed = 0, config_changed = 0;
802 u8 bssid[ETH_ALEN];
803
804 ASSERT_MGD_MTX(ifmgd);
805
806 if (WARN_ON(!ifmgd->associated))
807 return;
808
809 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
810
811 ifmgd->associated = NULL;
812 memset(ifmgd->bssid, 0, ETH_ALEN);
813
814 /*
815 * we need to commit the associated = NULL change because the
816 * scan code uses that to determine whether this iface should
817 * go to/wake up from powersave or not -- and could otherwise
818 * wake the queues erroneously.
819 */
820 smp_mb();
821
822 /*
823 * Thus, we can only afterwards stop the queues -- to account
824 * for the case where another CPU is finishing a scan at this
825 * time -- we don't want the scan code to enable queues.
826 */
827
828 netif_tx_stop_all_queues(sdata->dev);
829 netif_carrier_off(sdata->dev);
830
831 rcu_read_lock();
832 sta = sta_info_get(sdata, bssid);
833 if (sta) {
834 set_sta_flags(sta, WLAN_STA_DISASSOC);
835 ieee80211_sta_tear_down_BA_sessions(sta);
836 }
837 rcu_read_unlock();
838
839 changed |= ieee80211_reset_erp_info(sdata);
840
841 ieee80211_led_assoc(local, 0);
842 changed |= BSS_CHANGED_ASSOC;
843 sdata->vif.bss_conf.assoc = false;
844
845 ieee80211_set_wmm_default(sdata);
846
847 /* channel(_type) changes are handled by ieee80211_hw_config */
848 local->oper_channel_type = NL80211_CHAN_NO_HT;
849
850 /* on the next assoc, re-program HT parameters */
851 sdata->ht_opmode_valid = false;
852
853 local->power_constr_level = 0;
854
855 del_timer_sync(&local->dynamic_ps_timer);
856 cancel_work_sync(&local->dynamic_ps_enable_work);
857
858 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
859 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
860 config_changed |= IEEE80211_CONF_CHANGE_PS;
861 }
862
863 ieee80211_hw_config(local, config_changed);
864
865 /* And the BSSID changed -- not very interesting here */
866 changed |= BSS_CHANGED_BSSID;
867 ieee80211_bss_info_change_notify(sdata, changed);
868
869 if (remove_sta)
870 sta_info_destroy_addr(sdata, bssid);
871 }
872
873 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
874 struct ieee80211_hdr *hdr)
875 {
876 /*
877 * We can postpone the mgd.timer whenever receiving unicast frames
878 * from AP because we know that the connection is working both ways
879 * at that time. But multicast frames (and hence also beacons) must
880 * be ignored here, because we need to trigger the timer during
881 * data idle periods for sending the periodic probe request to the
882 * AP we're connected to.
883 */
884 if (is_multicast_ether_addr(hdr->addr1))
885 return;
886
887 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
888 return;
889
890 mod_timer(&sdata->u.mgd.conn_mon_timer,
891 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
892 }
893
894 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
895 {
896 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
897 const u8 *ssid;
898
899 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
900 ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
901 ssid + 2, ssid[1], NULL, 0);
902
903 ifmgd->probe_send_count++;
904 ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
905 run_again(ifmgd, ifmgd->probe_timeout);
906 }
907
908 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
909 bool beacon)
910 {
911 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
912 bool already = false;
913
914 if (!ieee80211_sdata_running(sdata))
915 return;
916
917 if (sdata->local->scanning)
918 return;
919
920 if (sdata->local->tmp_channel)
921 return;
922
923 mutex_lock(&ifmgd->mtx);
924
925 if (!ifmgd->associated)
926 goto out;
927
928 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
929 if (beacon && net_ratelimit())
930 printk(KERN_DEBUG "%s: detected beacon loss from AP "
931 "- sending probe request\n", sdata->name);
932 #endif
933
934 /*
935 * The driver/our work has already reported this event or the
936 * connection monitoring has kicked in and we have already sent
937 * a probe request. Or maybe the AP died and the driver keeps
938 * reporting until we disassociate...
939 *
940 * In either case we have to ignore the current call to this
941 * function (except for setting the correct probe reason bit)
942 * because otherwise we would reset the timer every time and
943 * never check whether we received a probe response!
944 */
945 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
946 IEEE80211_STA_CONNECTION_POLL))
947 already = true;
948
949 if (beacon)
950 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
951 else
952 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
953
954 if (already)
955 goto out;
956
957 mutex_lock(&sdata->local->iflist_mtx);
958 ieee80211_recalc_ps(sdata->local, -1);
959 mutex_unlock(&sdata->local->iflist_mtx);
960
961 ifmgd->probe_send_count = 0;
962 ieee80211_mgd_probe_ap_send(sdata);
963 out:
964 mutex_unlock(&ifmgd->mtx);
965 }
966
967 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
968 {
969 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
970 struct ieee80211_local *local = sdata->local;
971 u8 bssid[ETH_ALEN];
972
973 mutex_lock(&ifmgd->mtx);
974 if (!ifmgd->associated) {
975 mutex_unlock(&ifmgd->mtx);
976 return;
977 }
978
979 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
980
981 printk(KERN_DEBUG "Connection to AP %pM lost.\n", bssid);
982
983 ieee80211_set_disassoc(sdata, true);
984 ieee80211_recalc_idle(local);
985 mutex_unlock(&ifmgd->mtx);
986 /*
987 * must be outside lock due to cfg80211,
988 * but that's not a problem.
989 */
990 ieee80211_send_deauth_disassoc(sdata, bssid,
991 IEEE80211_STYPE_DEAUTH,
992 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
993 NULL, true);
994 }
995
996 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
997 {
998 struct ieee80211_sub_if_data *sdata =
999 container_of(work, struct ieee80211_sub_if_data,
1000 u.mgd.beacon_connection_loss_work);
1001
1002 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1003 __ieee80211_connection_loss(sdata);
1004 else
1005 ieee80211_mgd_probe_ap(sdata, true);
1006 }
1007
1008 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1009 {
1010 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1011 struct ieee80211_hw *hw = &sdata->local->hw;
1012
1013 trace_api_beacon_loss(sdata);
1014
1015 WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1016 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1017 }
1018 EXPORT_SYMBOL(ieee80211_beacon_loss);
1019
1020 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1021 {
1022 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1023 struct ieee80211_hw *hw = &sdata->local->hw;
1024
1025 trace_api_connection_loss(sdata);
1026
1027 WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1028 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1029 }
1030 EXPORT_SYMBOL(ieee80211_connection_loss);
1031
1032
1033 static enum rx_mgmt_action __must_check
1034 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1035 struct ieee80211_mgmt *mgmt, size_t len)
1036 {
1037 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1038 const u8 *bssid = NULL;
1039 u16 reason_code;
1040
1041 if (len < 24 + 2)
1042 return RX_MGMT_NONE;
1043
1044 ASSERT_MGD_MTX(ifmgd);
1045
1046 bssid = ifmgd->associated->bssid;
1047
1048 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1049
1050 printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1051 sdata->name, bssid, reason_code);
1052
1053 ieee80211_set_disassoc(sdata, true);
1054 ieee80211_recalc_idle(sdata->local);
1055
1056 return RX_MGMT_CFG80211_DEAUTH;
1057 }
1058
1059
1060 static enum rx_mgmt_action __must_check
1061 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1062 struct ieee80211_mgmt *mgmt, size_t len)
1063 {
1064 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1065 u16 reason_code;
1066
1067 if (len < 24 + 2)
1068 return RX_MGMT_NONE;
1069
1070 ASSERT_MGD_MTX(ifmgd);
1071
1072 if (WARN_ON(!ifmgd->associated))
1073 return RX_MGMT_NONE;
1074
1075 if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1076 return RX_MGMT_NONE;
1077
1078 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1079
1080 printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1081 sdata->name, mgmt->sa, reason_code);
1082
1083 ieee80211_set_disassoc(sdata, true);
1084 ieee80211_recalc_idle(sdata->local);
1085 return RX_MGMT_CFG80211_DISASSOC;
1086 }
1087
1088
1089 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1090 struct ieee80211_mgmt *mgmt, size_t len)
1091 {
1092 struct ieee80211_sub_if_data *sdata = wk->sdata;
1093 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1094 struct ieee80211_local *local = sdata->local;
1095 struct ieee80211_supported_band *sband;
1096 struct sta_info *sta;
1097 struct cfg80211_bss *cbss = wk->assoc.bss;
1098 u8 *pos;
1099 u32 rates, basic_rates;
1100 u16 capab_info, aid;
1101 struct ieee802_11_elems elems;
1102 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1103 u32 changed = 0;
1104 int i, j, err;
1105 bool have_higher_than_11mbit = false;
1106 u16 ap_ht_cap_flags;
1107
1108 /* AssocResp and ReassocResp have identical structure */
1109
1110 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1111 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1112
1113 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1114 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1115 "set\n", sdata->name, aid);
1116 aid &= ~(BIT(15) | BIT(14));
1117
1118 pos = mgmt->u.assoc_resp.variable;
1119 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1120
1121 if (!elems.supp_rates) {
1122 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1123 sdata->name);
1124 return false;
1125 }
1126
1127 ifmgd->aid = aid;
1128
1129 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1130 if (!sta) {
1131 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1132 " the AP\n", sdata->name);
1133 return false;
1134 }
1135
1136 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1137 WLAN_STA_ASSOC_AP);
1138 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1139 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1140
1141 rates = 0;
1142 basic_rates = 0;
1143 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1144
1145 for (i = 0; i < elems.supp_rates_len; i++) {
1146 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1147 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1148
1149 if (rate > 110)
1150 have_higher_than_11mbit = true;
1151
1152 for (j = 0; j < sband->n_bitrates; j++) {
1153 if (sband->bitrates[j].bitrate == rate) {
1154 rates |= BIT(j);
1155 if (is_basic)
1156 basic_rates |= BIT(j);
1157 break;
1158 }
1159 }
1160 }
1161
1162 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1163 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1164 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1165
1166 if (rate > 110)
1167 have_higher_than_11mbit = true;
1168
1169 for (j = 0; j < sband->n_bitrates; j++) {
1170 if (sband->bitrates[j].bitrate == rate) {
1171 rates |= BIT(j);
1172 if (is_basic)
1173 basic_rates |= BIT(j);
1174 break;
1175 }
1176 }
1177 }
1178
1179 sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1180 sdata->vif.bss_conf.basic_rates = basic_rates;
1181
1182 /* cf. IEEE 802.11 9.2.12 */
1183 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1184 have_higher_than_11mbit)
1185 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1186 else
1187 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1188
1189 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1190 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1191 elems.ht_cap_elem, &sta->sta.ht_cap);
1192
1193 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1194
1195 rate_control_rate_init(sta);
1196
1197 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1198 set_sta_flags(sta, WLAN_STA_MFP);
1199
1200 if (elems.wmm_param)
1201 set_sta_flags(sta, WLAN_STA_WME);
1202
1203 err = sta_info_insert(sta);
1204 sta = NULL;
1205 if (err) {
1206 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1207 " the AP (error %d)\n", sdata->name, err);
1208 return false;
1209 }
1210
1211 if (elems.wmm_param)
1212 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1213 elems.wmm_param_len);
1214 else
1215 ieee80211_set_wmm_default(sdata);
1216
1217 local->oper_channel = wk->chan;
1218
1219 if (elems.ht_info_elem && elems.wmm_param &&
1220 (sdata->local->hw.queues >= 4) &&
1221 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1222 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1223 cbss->bssid, ap_ht_cap_flags);
1224
1225 /* set AID and assoc capability,
1226 * ieee80211_set_associated() will tell the driver */
1227 bss_conf->aid = aid;
1228 bss_conf->assoc_capability = capab_info;
1229 ieee80211_set_associated(sdata, cbss, changed);
1230
1231 /*
1232 * If we're using 4-addr mode, let the AP know that we're
1233 * doing so, so that it can create the STA VLAN on its side
1234 */
1235 if (ifmgd->use_4addr)
1236 ieee80211_send_4addr_nullfunc(local, sdata);
1237
1238 /*
1239 * Start timer to probe the connection to the AP now.
1240 * Also start the timer that will detect beacon loss.
1241 */
1242 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1243 mod_beacon_timer(sdata);
1244
1245 return true;
1246 }
1247
1248
1249 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1250 struct ieee80211_mgmt *mgmt,
1251 size_t len,
1252 struct ieee80211_rx_status *rx_status,
1253 struct ieee802_11_elems *elems,
1254 bool beacon)
1255 {
1256 struct ieee80211_local *local = sdata->local;
1257 int freq;
1258 struct ieee80211_bss *bss;
1259 struct ieee80211_channel *channel;
1260 bool need_ps = false;
1261
1262 if (sdata->u.mgd.associated) {
1263 bss = (void *)sdata->u.mgd.associated->priv;
1264 /* not previously set so we may need to recalc */
1265 need_ps = !bss->dtim_period;
1266 }
1267
1268 if (elems->ds_params && elems->ds_params_len == 1)
1269 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1270 else
1271 freq = rx_status->freq;
1272
1273 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1274
1275 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1276 return;
1277
1278 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1279 channel, beacon);
1280 if (bss)
1281 ieee80211_rx_bss_put(local, bss);
1282
1283 if (!sdata->u.mgd.associated)
1284 return;
1285
1286 if (need_ps) {
1287 mutex_lock(&local->iflist_mtx);
1288 ieee80211_recalc_ps(local, -1);
1289 mutex_unlock(&local->iflist_mtx);
1290 }
1291
1292 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1293 (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1294 ETH_ALEN) == 0)) {
1295 struct ieee80211_channel_sw_ie *sw_elem =
1296 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1297 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1298 }
1299 }
1300
1301
1302 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1303 struct sk_buff *skb)
1304 {
1305 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1306 struct ieee80211_if_managed *ifmgd;
1307 struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1308 size_t baselen, len = skb->len;
1309 struct ieee802_11_elems elems;
1310
1311 ifmgd = &sdata->u.mgd;
1312
1313 ASSERT_MGD_MTX(ifmgd);
1314
1315 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1316 return; /* ignore ProbeResp to foreign address */
1317
1318 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1319 if (baselen > len)
1320 return;
1321
1322 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1323 &elems);
1324
1325 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1326
1327 if (ifmgd->associated &&
1328 memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1329 ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1330 IEEE80211_STA_CONNECTION_POLL)) {
1331 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1332 IEEE80211_STA_BEACON_POLL);
1333 mutex_lock(&sdata->local->iflist_mtx);
1334 ieee80211_recalc_ps(sdata->local, -1);
1335 mutex_unlock(&sdata->local->iflist_mtx);
1336 /*
1337 * We've received a probe response, but are not sure whether
1338 * we have or will be receiving any beacons or data, so let's
1339 * schedule the timers again, just in case.
1340 */
1341 mod_beacon_timer(sdata);
1342 mod_timer(&ifmgd->conn_mon_timer,
1343 round_jiffies_up(jiffies +
1344 IEEE80211_CONNECTION_IDLE_TIME));
1345 }
1346 }
1347
1348 /*
1349 * This is the canonical list of information elements we care about,
1350 * the filter code also gives us all changes to the Microsoft OUI
1351 * (00:50:F2) vendor IE which is used for WMM which we need to track.
1352 *
1353 * We implement beacon filtering in software since that means we can
1354 * avoid processing the frame here and in cfg80211, and userspace
1355 * will not be able to tell whether the hardware supports it or not.
1356 *
1357 * XXX: This list needs to be dynamic -- userspace needs to be able to
1358 * add items it requires. It also needs to be able to tell us to
1359 * look out for other vendor IEs.
1360 */
1361 static const u64 care_about_ies =
1362 (1ULL << WLAN_EID_COUNTRY) |
1363 (1ULL << WLAN_EID_ERP_INFO) |
1364 (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1365 (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1366 (1ULL << WLAN_EID_HT_CAPABILITY) |
1367 (1ULL << WLAN_EID_HT_INFORMATION);
1368
1369 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1370 struct ieee80211_mgmt *mgmt,
1371 size_t len,
1372 struct ieee80211_rx_status *rx_status)
1373 {
1374 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1375 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1376 size_t baselen;
1377 struct ieee802_11_elems elems;
1378 struct ieee80211_local *local = sdata->local;
1379 u32 changed = 0;
1380 bool erp_valid, directed_tim = false;
1381 u8 erp_value = 0;
1382 u32 ncrc;
1383 u8 *bssid;
1384
1385 ASSERT_MGD_MTX(ifmgd);
1386
1387 /* Process beacon from the current BSS */
1388 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1389 if (baselen > len)
1390 return;
1391
1392 if (rx_status->freq != local->hw.conf.channel->center_freq)
1393 return;
1394
1395 /*
1396 * We might have received a number of frames, among them a
1397 * disassoc frame and a beacon...
1398 */
1399 if (!ifmgd->associated)
1400 return;
1401
1402 bssid = ifmgd->associated->bssid;
1403
1404 /*
1405 * And in theory even frames from a different AP we were just
1406 * associated to a split-second ago!
1407 */
1408 if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1409 return;
1410
1411 /* Track average RSSI from the Beacon frames of the current AP */
1412 ifmgd->last_beacon_signal = rx_status->signal;
1413 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1414 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1415 ifmgd->ave_beacon_signal = rx_status->signal;
1416 ifmgd->last_cqm_event_signal = 0;
1417 } else {
1418 ifmgd->ave_beacon_signal =
1419 (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1420 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1421 ifmgd->ave_beacon_signal) / 16;
1422 }
1423 if (bss_conf->cqm_rssi_thold &&
1424 !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1425 int sig = ifmgd->ave_beacon_signal / 16;
1426 int last_event = ifmgd->last_cqm_event_signal;
1427 int thold = bss_conf->cqm_rssi_thold;
1428 int hyst = bss_conf->cqm_rssi_hyst;
1429 if (sig < thold &&
1430 (last_event == 0 || sig < last_event - hyst)) {
1431 ifmgd->last_cqm_event_signal = sig;
1432 ieee80211_cqm_rssi_notify(
1433 &sdata->vif,
1434 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1435 GFP_KERNEL);
1436 } else if (sig > thold &&
1437 (last_event == 0 || sig > last_event + hyst)) {
1438 ifmgd->last_cqm_event_signal = sig;
1439 ieee80211_cqm_rssi_notify(
1440 &sdata->vif,
1441 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1442 GFP_KERNEL);
1443 }
1444 }
1445
1446 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1447 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1448 if (net_ratelimit()) {
1449 printk(KERN_DEBUG "%s: cancelling probereq poll due "
1450 "to a received beacon\n", sdata->name);
1451 }
1452 #endif
1453 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1454 mutex_lock(&local->iflist_mtx);
1455 ieee80211_recalc_ps(local, -1);
1456 mutex_unlock(&local->iflist_mtx);
1457 }
1458
1459 /*
1460 * Push the beacon loss detection into the future since
1461 * we are processing a beacon from the AP just now.
1462 */
1463 mod_beacon_timer(sdata);
1464
1465 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1466 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1467 len - baselen, &elems,
1468 care_about_ies, ncrc);
1469
1470 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1471 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1472 ifmgd->aid);
1473
1474 if (ncrc != ifmgd->beacon_crc) {
1475 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1476 true);
1477
1478 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1479 elems.wmm_param_len);
1480 }
1481
1482 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1483 if (directed_tim) {
1484 if (local->hw.conf.dynamic_ps_timeout > 0) {
1485 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1486 ieee80211_hw_config(local,
1487 IEEE80211_CONF_CHANGE_PS);
1488 ieee80211_send_nullfunc(local, sdata, 0);
1489 } else {
1490 local->pspolling = true;
1491
1492 /*
1493 * Here is assumed that the driver will be
1494 * able to send ps-poll frame and receive a
1495 * response even though power save mode is
1496 * enabled, but some drivers might require
1497 * to disable power save here. This needs
1498 * to be investigated.
1499 */
1500 ieee80211_send_pspoll(local, sdata);
1501 }
1502 }
1503 }
1504
1505 if (ncrc == ifmgd->beacon_crc)
1506 return;
1507 ifmgd->beacon_crc = ncrc;
1508
1509 if (elems.erp_info && elems.erp_info_len >= 1) {
1510 erp_valid = true;
1511 erp_value = elems.erp_info[0];
1512 } else {
1513 erp_valid = false;
1514 }
1515 changed |= ieee80211_handle_bss_capability(sdata,
1516 le16_to_cpu(mgmt->u.beacon.capab_info),
1517 erp_valid, erp_value);
1518
1519
1520 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1521 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1522 struct sta_info *sta;
1523 struct ieee80211_supported_band *sband;
1524 u16 ap_ht_cap_flags;
1525
1526 rcu_read_lock();
1527
1528 sta = sta_info_get(sdata, bssid);
1529 if (WARN_ON(!sta)) {
1530 rcu_read_unlock();
1531 return;
1532 }
1533
1534 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1535
1536 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1537 elems.ht_cap_elem, &sta->sta.ht_cap);
1538
1539 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1540
1541 rcu_read_unlock();
1542
1543 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1544 bssid, ap_ht_cap_flags);
1545 }
1546
1547 /* Note: country IE parsing is done for us by cfg80211 */
1548 if (elems.country_elem) {
1549 /* TODO: IBSS also needs this */
1550 if (elems.pwr_constr_elem)
1551 ieee80211_handle_pwr_constr(sdata,
1552 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1553 elems.pwr_constr_elem,
1554 elems.pwr_constr_elem_len);
1555 }
1556
1557 ieee80211_bss_info_change_notify(sdata, changed);
1558 }
1559
1560 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1561 struct sk_buff *skb)
1562 {
1563 struct ieee80211_local *local = sdata->local;
1564 struct ieee80211_mgmt *mgmt;
1565 u16 fc;
1566
1567 if (skb->len < 24)
1568 return RX_DROP_MONITOR;
1569
1570 mgmt = (struct ieee80211_mgmt *) skb->data;
1571 fc = le16_to_cpu(mgmt->frame_control);
1572
1573 switch (fc & IEEE80211_FCTL_STYPE) {
1574 case IEEE80211_STYPE_PROBE_RESP:
1575 case IEEE80211_STYPE_BEACON:
1576 case IEEE80211_STYPE_DEAUTH:
1577 case IEEE80211_STYPE_DISASSOC:
1578 case IEEE80211_STYPE_ACTION:
1579 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1580 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
1581 return RX_QUEUED;
1582 }
1583
1584 return RX_DROP_MONITOR;
1585 }
1586
1587 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1588 struct sk_buff *skb)
1589 {
1590 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1591 struct ieee80211_rx_status *rx_status;
1592 struct ieee80211_mgmt *mgmt;
1593 enum rx_mgmt_action rma = RX_MGMT_NONE;
1594 u16 fc;
1595
1596 rx_status = (struct ieee80211_rx_status *) skb->cb;
1597 mgmt = (struct ieee80211_mgmt *) skb->data;
1598 fc = le16_to_cpu(mgmt->frame_control);
1599
1600 mutex_lock(&ifmgd->mtx);
1601
1602 if (ifmgd->associated &&
1603 memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1604 switch (fc & IEEE80211_FCTL_STYPE) {
1605 case IEEE80211_STYPE_BEACON:
1606 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1607 rx_status);
1608 break;
1609 case IEEE80211_STYPE_PROBE_RESP:
1610 ieee80211_rx_mgmt_probe_resp(sdata, skb);
1611 break;
1612 case IEEE80211_STYPE_DEAUTH:
1613 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1614 break;
1615 case IEEE80211_STYPE_DISASSOC:
1616 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1617 break;
1618 case IEEE80211_STYPE_ACTION:
1619 if (mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
1620 break;
1621
1622 ieee80211_sta_process_chanswitch(sdata,
1623 &mgmt->u.action.u.chan_switch.sw_elem,
1624 (void *)ifmgd->associated->priv);
1625 break;
1626 }
1627 mutex_unlock(&ifmgd->mtx);
1628
1629 switch (rma) {
1630 case RX_MGMT_NONE:
1631 /* no action */
1632 break;
1633 case RX_MGMT_CFG80211_DEAUTH:
1634 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1635 break;
1636 case RX_MGMT_CFG80211_DISASSOC:
1637 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1638 break;
1639 default:
1640 WARN(1, "unexpected: %d", rma);
1641 }
1642 goto out;
1643 }
1644
1645 mutex_unlock(&ifmgd->mtx);
1646
1647 if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1648 (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH)
1649 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1650
1651 out:
1652 kfree_skb(skb);
1653 }
1654
1655 static void ieee80211_sta_timer(unsigned long data)
1656 {
1657 struct ieee80211_sub_if_data *sdata =
1658 (struct ieee80211_sub_if_data *) data;
1659 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1660 struct ieee80211_local *local = sdata->local;
1661
1662 if (local->quiescing) {
1663 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1664 return;
1665 }
1666
1667 ieee80211_queue_work(&local->hw, &ifmgd->work);
1668 }
1669
1670 static void ieee80211_sta_work(struct work_struct *work)
1671 {
1672 struct ieee80211_sub_if_data *sdata =
1673 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1674 struct ieee80211_local *local = sdata->local;
1675 struct ieee80211_if_managed *ifmgd;
1676 struct sk_buff *skb;
1677
1678 if (!ieee80211_sdata_running(sdata))
1679 return;
1680
1681 if (local->scanning)
1682 return;
1683
1684 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1685 return;
1686
1687 /*
1688 * ieee80211_queue_work() should have picked up most cases,
1689 * here we'll pick the the rest.
1690 */
1691 if (WARN(local->suspended, "STA MLME work scheduled while "
1692 "going to suspend\n"))
1693 return;
1694
1695 ifmgd = &sdata->u.mgd;
1696
1697 /* first process frames to avoid timing out while a frame is pending */
1698 while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1699 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1700
1701 /* then process the rest of the work */
1702 mutex_lock(&ifmgd->mtx);
1703
1704 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1705 IEEE80211_STA_CONNECTION_POLL) &&
1706 ifmgd->associated) {
1707 u8 bssid[ETH_ALEN];
1708
1709 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1710 if (time_is_after_jiffies(ifmgd->probe_timeout))
1711 run_again(ifmgd, ifmgd->probe_timeout);
1712
1713 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1714 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1715 printk(KERN_DEBUG "No probe response from AP %pM"
1716 " after %dms, try %d\n", bssid,
1717 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1718 ifmgd->probe_send_count);
1719 #endif
1720 ieee80211_mgd_probe_ap_send(sdata);
1721 } else {
1722 /*
1723 * We actually lost the connection ... or did we?
1724 * Let's make sure!
1725 */
1726 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1727 IEEE80211_STA_BEACON_POLL);
1728 printk(KERN_DEBUG "No probe response from AP %pM"
1729 " after %dms, disconnecting.\n",
1730 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1731 ieee80211_set_disassoc(sdata, true);
1732 ieee80211_recalc_idle(local);
1733 mutex_unlock(&ifmgd->mtx);
1734 /*
1735 * must be outside lock due to cfg80211,
1736 * but that's not a problem.
1737 */
1738 ieee80211_send_deauth_disassoc(sdata, bssid,
1739 IEEE80211_STYPE_DEAUTH,
1740 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1741 NULL, true);
1742 mutex_lock(&ifmgd->mtx);
1743 }
1744 }
1745
1746 mutex_unlock(&ifmgd->mtx);
1747 }
1748
1749 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1750 {
1751 struct ieee80211_sub_if_data *sdata =
1752 (struct ieee80211_sub_if_data *) data;
1753 struct ieee80211_local *local = sdata->local;
1754
1755 if (local->quiescing)
1756 return;
1757
1758 ieee80211_queue_work(&sdata->local->hw,
1759 &sdata->u.mgd.beacon_connection_loss_work);
1760 }
1761
1762 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1763 {
1764 struct ieee80211_sub_if_data *sdata =
1765 (struct ieee80211_sub_if_data *) data;
1766 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1767 struct ieee80211_local *local = sdata->local;
1768
1769 if (local->quiescing)
1770 return;
1771
1772 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1773 }
1774
1775 static void ieee80211_sta_monitor_work(struct work_struct *work)
1776 {
1777 struct ieee80211_sub_if_data *sdata =
1778 container_of(work, struct ieee80211_sub_if_data,
1779 u.mgd.monitor_work);
1780
1781 ieee80211_mgd_probe_ap(sdata, false);
1782 }
1783
1784 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1785 {
1786 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1787 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1788 IEEE80211_STA_CONNECTION_POLL);
1789
1790 /* let's probe the connection once */
1791 ieee80211_queue_work(&sdata->local->hw,
1792 &sdata->u.mgd.monitor_work);
1793 /* and do all the other regular work too */
1794 ieee80211_queue_work(&sdata->local->hw,
1795 &sdata->u.mgd.work);
1796 }
1797 }
1798
1799 #ifdef CONFIG_PM
1800 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1801 {
1802 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1803
1804 /*
1805 * we need to use atomic bitops for the running bits
1806 * only because both timers might fire at the same
1807 * time -- the code here is properly synchronised.
1808 */
1809
1810 cancel_work_sync(&ifmgd->work);
1811 cancel_work_sync(&ifmgd->beacon_connection_loss_work);
1812 if (del_timer_sync(&ifmgd->timer))
1813 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1814
1815 cancel_work_sync(&ifmgd->chswitch_work);
1816 if (del_timer_sync(&ifmgd->chswitch_timer))
1817 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1818
1819 cancel_work_sync(&ifmgd->monitor_work);
1820 /* these will just be re-established on connection */
1821 del_timer_sync(&ifmgd->conn_mon_timer);
1822 del_timer_sync(&ifmgd->bcn_mon_timer);
1823 }
1824
1825 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1826 {
1827 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1828
1829 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1830 add_timer(&ifmgd->timer);
1831 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1832 add_timer(&ifmgd->chswitch_timer);
1833 }
1834 #endif
1835
1836 /* interface setup */
1837 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1838 {
1839 struct ieee80211_if_managed *ifmgd;
1840
1841 ifmgd = &sdata->u.mgd;
1842 INIT_WORK(&ifmgd->work, ieee80211_sta_work);
1843 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1844 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1845 INIT_WORK(&ifmgd->beacon_connection_loss_work,
1846 ieee80211_beacon_connection_loss_work);
1847 setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1848 (unsigned long) sdata);
1849 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1850 (unsigned long) sdata);
1851 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1852 (unsigned long) sdata);
1853 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1854 (unsigned long) sdata);
1855 skb_queue_head_init(&ifmgd->skb_queue);
1856
1857 ifmgd->flags = 0;
1858
1859 mutex_init(&ifmgd->mtx);
1860
1861 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1862 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1863 else
1864 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1865 }
1866
1867 /* scan finished notification */
1868 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1869 {
1870 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1871
1872 /* Restart STA timers */
1873 rcu_read_lock();
1874 list_for_each_entry_rcu(sdata, &local->interfaces, list)
1875 ieee80211_restart_sta_timer(sdata);
1876 rcu_read_unlock();
1877 }
1878
1879 int ieee80211_max_network_latency(struct notifier_block *nb,
1880 unsigned long data, void *dummy)
1881 {
1882 s32 latency_usec = (s32) data;
1883 struct ieee80211_local *local =
1884 container_of(nb, struct ieee80211_local,
1885 network_latency_notifier);
1886
1887 mutex_lock(&local->iflist_mtx);
1888 ieee80211_recalc_ps(local, latency_usec);
1889 mutex_unlock(&local->iflist_mtx);
1890
1891 return 0;
1892 }
1893
1894 /* config hooks */
1895 static enum work_done_result
1896 ieee80211_probe_auth_done(struct ieee80211_work *wk,
1897 struct sk_buff *skb)
1898 {
1899 if (!skb) {
1900 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
1901 return WORK_DONE_DESTROY;
1902 }
1903
1904 if (wk->type == IEEE80211_WORK_AUTH) {
1905 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
1906 return WORK_DONE_DESTROY;
1907 }
1908
1909 mutex_lock(&wk->sdata->u.mgd.mtx);
1910 ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
1911 mutex_unlock(&wk->sdata->u.mgd.mtx);
1912
1913 wk->type = IEEE80211_WORK_AUTH;
1914 wk->probe_auth.tries = 0;
1915 return WORK_DONE_REQUEUE;
1916 }
1917
1918 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
1919 struct cfg80211_auth_request *req)
1920 {
1921 const u8 *ssid;
1922 struct ieee80211_work *wk;
1923 u16 auth_alg;
1924
1925 if (req->local_state_change)
1926 return 0; /* no need to update mac80211 state */
1927
1928 switch (req->auth_type) {
1929 case NL80211_AUTHTYPE_OPEN_SYSTEM:
1930 auth_alg = WLAN_AUTH_OPEN;
1931 break;
1932 case NL80211_AUTHTYPE_SHARED_KEY:
1933 auth_alg = WLAN_AUTH_SHARED_KEY;
1934 break;
1935 case NL80211_AUTHTYPE_FT:
1936 auth_alg = WLAN_AUTH_FT;
1937 break;
1938 case NL80211_AUTHTYPE_NETWORK_EAP:
1939 auth_alg = WLAN_AUTH_LEAP;
1940 break;
1941 default:
1942 return -EOPNOTSUPP;
1943 }
1944
1945 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1946 if (!wk)
1947 return -ENOMEM;
1948
1949 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1950
1951 if (req->ie && req->ie_len) {
1952 memcpy(wk->ie, req->ie, req->ie_len);
1953 wk->ie_len = req->ie_len;
1954 }
1955
1956 if (req->key && req->key_len) {
1957 wk->probe_auth.key_len = req->key_len;
1958 wk->probe_auth.key_idx = req->key_idx;
1959 memcpy(wk->probe_auth.key, req->key, req->key_len);
1960 }
1961
1962 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1963 memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
1964 wk->probe_auth.ssid_len = ssid[1];
1965
1966 wk->probe_auth.algorithm = auth_alg;
1967 wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
1968
1969 /* if we already have a probe, don't probe again */
1970 if (req->bss->proberesp_ies)
1971 wk->type = IEEE80211_WORK_AUTH;
1972 else
1973 wk->type = IEEE80211_WORK_DIRECT_PROBE;
1974 wk->chan = req->bss->channel;
1975 wk->sdata = sdata;
1976 wk->done = ieee80211_probe_auth_done;
1977
1978 ieee80211_add_work(wk);
1979 return 0;
1980 }
1981
1982 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
1983 struct sk_buff *skb)
1984 {
1985 struct ieee80211_mgmt *mgmt;
1986 u16 status;
1987
1988 if (!skb) {
1989 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
1990 return WORK_DONE_DESTROY;
1991 }
1992
1993 mgmt = (void *)skb->data;
1994 status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1995
1996 if (status == WLAN_STATUS_SUCCESS) {
1997 mutex_lock(&wk->sdata->u.mgd.mtx);
1998 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
1999 mutex_unlock(&wk->sdata->u.mgd.mtx);
2000 /* oops -- internal error -- send timeout for now */
2001 cfg80211_send_assoc_timeout(wk->sdata->dev,
2002 wk->filter_ta);
2003 return WORK_DONE_DESTROY;
2004 }
2005 mutex_unlock(&wk->sdata->u.mgd.mtx);
2006 }
2007
2008 cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2009 return WORK_DONE_DESTROY;
2010 }
2011
2012 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2013 struct cfg80211_assoc_request *req)
2014 {
2015 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2016 struct ieee80211_bss *bss = (void *)req->bss->priv;
2017 struct ieee80211_work *wk;
2018 const u8 *ssid;
2019 int i;
2020
2021 mutex_lock(&ifmgd->mtx);
2022 if (ifmgd->associated) {
2023 if (!req->prev_bssid ||
2024 memcmp(req->prev_bssid, ifmgd->associated->bssid,
2025 ETH_ALEN)) {
2026 /*
2027 * We are already associated and the request was not a
2028 * reassociation request from the current BSS, so
2029 * reject it.
2030 */
2031 mutex_unlock(&ifmgd->mtx);
2032 return -EALREADY;
2033 }
2034
2035 /* Trying to reassociate - clear previous association state */
2036 ieee80211_set_disassoc(sdata, true);
2037 }
2038 mutex_unlock(&ifmgd->mtx);
2039
2040 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2041 if (!wk)
2042 return -ENOMEM;
2043
2044 ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2045 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2046
2047 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2048 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2049 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2050 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2051 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2052
2053
2054 if (req->ie && req->ie_len) {
2055 memcpy(wk->ie, req->ie, req->ie_len);
2056 wk->ie_len = req->ie_len;
2057 } else
2058 wk->ie_len = 0;
2059
2060 wk->assoc.bss = req->bss;
2061
2062 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2063
2064 /* new association always uses requested smps mode */
2065 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2066 if (ifmgd->powersave)
2067 ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2068 else
2069 ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2070 } else
2071 ifmgd->ap_smps = ifmgd->req_smps;
2072
2073 wk->assoc.smps = ifmgd->ap_smps;
2074 /*
2075 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2076 * We still associate in non-HT mode (11a/b/g) if any one of these
2077 * ciphers is configured as pairwise.
2078 * We can set this to true for non-11n hardware, that'll be checked
2079 * separately along with the peer capabilities.
2080 */
2081 wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2082 wk->assoc.capability = req->bss->capability;
2083 wk->assoc.wmm_used = bss->wmm_used;
2084 wk->assoc.supp_rates = bss->supp_rates;
2085 wk->assoc.supp_rates_len = bss->supp_rates_len;
2086 wk->assoc.ht_information_ie =
2087 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2088
2089 if (bss->wmm_used && bss->uapsd_supported &&
2090 (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2091 wk->assoc.uapsd_used = true;
2092 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2093 } else {
2094 wk->assoc.uapsd_used = false;
2095 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2096 }
2097
2098 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2099 memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2100 wk->assoc.ssid_len = ssid[1];
2101
2102 if (req->prev_bssid)
2103 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2104
2105 wk->type = IEEE80211_WORK_ASSOC;
2106 wk->chan = req->bss->channel;
2107 wk->sdata = sdata;
2108 wk->done = ieee80211_assoc_done;
2109
2110 if (req->use_mfp) {
2111 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2112 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2113 } else {
2114 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2115 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2116 }
2117
2118 if (req->crypto.control_port)
2119 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2120 else
2121 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2122
2123 ieee80211_add_work(wk);
2124 return 0;
2125 }
2126
2127 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2128 struct cfg80211_deauth_request *req,
2129 void *cookie)
2130 {
2131 struct ieee80211_local *local = sdata->local;
2132 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2133 struct ieee80211_work *wk;
2134 const u8 *bssid = req->bss->bssid;
2135
2136 mutex_lock(&ifmgd->mtx);
2137
2138 if (ifmgd->associated == req->bss) {
2139 bssid = req->bss->bssid;
2140 ieee80211_set_disassoc(sdata, true);
2141 mutex_unlock(&ifmgd->mtx);
2142 } else {
2143 bool not_auth_yet = false;
2144
2145 mutex_unlock(&ifmgd->mtx);
2146
2147 mutex_lock(&local->work_mtx);
2148 list_for_each_entry(wk, &local->work_list, list) {
2149 if (wk->sdata != sdata)
2150 continue;
2151
2152 if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2153 wk->type != IEEE80211_WORK_AUTH)
2154 continue;
2155
2156 if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2157 continue;
2158
2159 not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2160 list_del_rcu(&wk->list);
2161 free_work(wk);
2162 break;
2163 }
2164 mutex_unlock(&local->work_mtx);
2165
2166 /*
2167 * If somebody requests authentication and we haven't
2168 * sent out an auth frame yet there's no need to send
2169 * out a deauth frame either. If the state was PROBE,
2170 * then this is the case. If it's AUTH we have sent a
2171 * frame, and if it's IDLE we have completed the auth
2172 * process already.
2173 */
2174 if (not_auth_yet) {
2175 __cfg80211_auth_canceled(sdata->dev, bssid);
2176 return 0;
2177 }
2178 }
2179
2180 printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2181 sdata->name, bssid, req->reason_code);
2182
2183 ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2184 req->reason_code, cookie,
2185 !req->local_state_change);
2186
2187 ieee80211_recalc_idle(sdata->local);
2188
2189 return 0;
2190 }
2191
2192 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2193 struct cfg80211_disassoc_request *req,
2194 void *cookie)
2195 {
2196 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2197 u8 bssid[ETH_ALEN];
2198
2199 mutex_lock(&ifmgd->mtx);
2200
2201 /*
2202 * cfg80211 should catch this ... but it's racy since
2203 * we can receive a disassoc frame, process it, hand it
2204 * to cfg80211 while that's in a locked section already
2205 * trying to tell us that the user wants to disconnect.
2206 */
2207 if (ifmgd->associated != req->bss) {
2208 mutex_unlock(&ifmgd->mtx);
2209 return -ENOLINK;
2210 }
2211
2212 printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2213 sdata->name, req->bss->bssid, req->reason_code);
2214
2215 memcpy(bssid, req->bss->bssid, ETH_ALEN);
2216 ieee80211_set_disassoc(sdata, false);
2217
2218 mutex_unlock(&ifmgd->mtx);
2219
2220 ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2221 IEEE80211_STYPE_DISASSOC, req->reason_code,
2222 cookie, !req->local_state_change);
2223 sta_info_destroy_addr(sdata, bssid);
2224
2225 ieee80211_recalc_idle(sdata->local);
2226
2227 return 0;
2228 }
2229
2230 int ieee80211_mgd_action(struct ieee80211_sub_if_data *sdata,
2231 struct ieee80211_channel *chan,
2232 enum nl80211_channel_type channel_type,
2233 const u8 *buf, size_t len, u64 *cookie)
2234 {
2235 struct ieee80211_local *local = sdata->local;
2236 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2237 struct sk_buff *skb;
2238
2239 /* Check that we are on the requested channel for transmission */
2240 if ((chan != local->tmp_channel ||
2241 channel_type != local->tmp_channel_type) &&
2242 (chan != local->oper_channel ||
2243 channel_type != local->oper_channel_type))
2244 return -EBUSY;
2245
2246 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len);
2247 if (!skb)
2248 return -ENOMEM;
2249 skb_reserve(skb, local->hw.extra_tx_headroom);
2250
2251 memcpy(skb_put(skb, len), buf, len);
2252
2253 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
2254 IEEE80211_SKB_CB(skb)->flags |=
2255 IEEE80211_TX_INTFL_DONT_ENCRYPT;
2256 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX |
2257 IEEE80211_TX_CTL_REQ_TX_STATUS;
2258 skb->dev = sdata->dev;
2259 ieee80211_tx_skb(sdata, skb);
2260
2261 *cookie = (unsigned long) skb;
2262 return 0;
2263 }
2264
2265 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2266 enum nl80211_cqm_rssi_threshold_event rssi_event,
2267 gfp_t gfp)
2268 {
2269 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2270
2271 trace_api_cqm_rssi_notify(sdata, rssi_event);
2272
2273 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2274 }
2275 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
Linux kernel - Deliverables
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