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mac80211: Send deauth/disassoc prior to dropping STA entry
[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)
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 ieee80211_tx_skb(sdata, skb);
251 }
252
253 void ieee80211_send_pspoll(struct ieee80211_local *local,
254 struct ieee80211_sub_if_data *sdata)
255 {
256 struct ieee80211_pspoll *pspoll;
257 struct sk_buff *skb;
258
259 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
260 if (!skb)
261 return;
262
263 pspoll = (struct ieee80211_pspoll *) skb->data;
264 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
265
266 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
267 ieee80211_tx_skb(sdata, skb);
268 }
269
270 void ieee80211_send_nullfunc(struct ieee80211_local *local,
271 struct ieee80211_sub_if_data *sdata,
272 int powersave)
273 {
274 struct sk_buff *skb;
275 struct ieee80211_hdr_3addr *nullfunc;
276
277 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
278 if (!skb)
279 return;
280
281 nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
282 if (powersave)
283 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
284
285 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
286 ieee80211_tx_skb(sdata, skb);
287 }
288
289 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
290 struct ieee80211_sub_if_data *sdata)
291 {
292 struct sk_buff *skb;
293 struct ieee80211_hdr *nullfunc;
294 __le16 fc;
295
296 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
297 return;
298
299 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
300 if (!skb) {
301 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
302 "nullfunc frame\n", sdata->name);
303 return;
304 }
305 skb_reserve(skb, local->hw.extra_tx_headroom);
306
307 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
308 memset(nullfunc, 0, 30);
309 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
310 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
311 nullfunc->frame_control = fc;
312 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
313 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
314 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
315 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
316
317 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
318 ieee80211_tx_skb(sdata, skb);
319 }
320
321 /* spectrum management related things */
322 static void ieee80211_chswitch_work(struct work_struct *work)
323 {
324 struct ieee80211_sub_if_data *sdata =
325 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
326 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
327
328 if (!ieee80211_sdata_running(sdata))
329 return;
330
331 mutex_lock(&ifmgd->mtx);
332 if (!ifmgd->associated)
333 goto out;
334
335 sdata->local->oper_channel = sdata->local->csa_channel;
336 ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL);
337
338 /* XXX: shouldn't really modify cfg80211-owned data! */
339 ifmgd->associated->channel = sdata->local->oper_channel;
340
341 ieee80211_wake_queues_by_reason(&sdata->local->hw,
342 IEEE80211_QUEUE_STOP_REASON_CSA);
343 out:
344 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
345 mutex_unlock(&ifmgd->mtx);
346 }
347
348 static void ieee80211_chswitch_timer(unsigned long data)
349 {
350 struct ieee80211_sub_if_data *sdata =
351 (struct ieee80211_sub_if_data *) data;
352 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
353
354 if (sdata->local->quiescing) {
355 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
356 return;
357 }
358
359 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
360 }
361
362 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
363 struct ieee80211_channel_sw_ie *sw_elem,
364 struct ieee80211_bss *bss)
365 {
366 struct cfg80211_bss *cbss =
367 container_of((void *)bss, struct cfg80211_bss, priv);
368 struct ieee80211_channel *new_ch;
369 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
370 int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
371
372 ASSERT_MGD_MTX(ifmgd);
373
374 if (!ifmgd->associated)
375 return;
376
377 if (sdata->local->scanning)
378 return;
379
380 /* Disregard subsequent beacons if we are already running a timer
381 processing a CSA */
382
383 if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
384 return;
385
386 new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
387 if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
388 return;
389
390 sdata->local->csa_channel = new_ch;
391
392 if (sw_elem->count <= 1) {
393 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
394 } else {
395 ieee80211_stop_queues_by_reason(&sdata->local->hw,
396 IEEE80211_QUEUE_STOP_REASON_CSA);
397 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
398 mod_timer(&ifmgd->chswitch_timer,
399 jiffies +
400 msecs_to_jiffies(sw_elem->count *
401 cbss->beacon_interval));
402 }
403 }
404
405 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
406 u16 capab_info, u8 *pwr_constr_elem,
407 u8 pwr_constr_elem_len)
408 {
409 struct ieee80211_conf *conf = &sdata->local->hw.conf;
410
411 if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
412 return;
413
414 /* Power constraint IE length should be 1 octet */
415 if (pwr_constr_elem_len != 1)
416 return;
417
418 if ((*pwr_constr_elem <= conf->channel->max_power) &&
419 (*pwr_constr_elem != sdata->local->power_constr_level)) {
420 sdata->local->power_constr_level = *pwr_constr_elem;
421 ieee80211_hw_config(sdata->local, 0);
422 }
423 }
424
425 /* powersave */
426 static void ieee80211_enable_ps(struct ieee80211_local *local,
427 struct ieee80211_sub_if_data *sdata)
428 {
429 struct ieee80211_conf *conf = &local->hw.conf;
430
431 /*
432 * If we are scanning right now then the parameters will
433 * take effect when scan finishes.
434 */
435 if (local->scanning)
436 return;
437
438 if (conf->dynamic_ps_timeout > 0 &&
439 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
440 mod_timer(&local->dynamic_ps_timer, jiffies +
441 msecs_to_jiffies(conf->dynamic_ps_timeout));
442 } else {
443 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
444 ieee80211_send_nullfunc(local, sdata, 1);
445
446 if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
447 conf->flags |= IEEE80211_CONF_PS;
448 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
449 }
450 }
451 }
452
453 static void ieee80211_change_ps(struct ieee80211_local *local)
454 {
455 struct ieee80211_conf *conf = &local->hw.conf;
456
457 if (local->ps_sdata) {
458 ieee80211_enable_ps(local, local->ps_sdata);
459 } else if (conf->flags & IEEE80211_CONF_PS) {
460 conf->flags &= ~IEEE80211_CONF_PS;
461 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
462 del_timer_sync(&local->dynamic_ps_timer);
463 cancel_work_sync(&local->dynamic_ps_enable_work);
464 }
465 }
466
467 /* need to hold RTNL or interface lock */
468 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
469 {
470 struct ieee80211_sub_if_data *sdata, *found = NULL;
471 int count = 0;
472
473 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
474 local->ps_sdata = NULL;
475 return;
476 }
477
478 if (!list_empty(&local->work_list)) {
479 local->ps_sdata = NULL;
480 goto change;
481 }
482
483 list_for_each_entry(sdata, &local->interfaces, list) {
484 if (!ieee80211_sdata_running(sdata))
485 continue;
486 if (sdata->vif.type != NL80211_IFTYPE_STATION)
487 continue;
488 found = sdata;
489 count++;
490 }
491
492 if (count == 1 && found->u.mgd.powersave &&
493 found->u.mgd.associated &&
494 found->u.mgd.associated->beacon_ies &&
495 !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
496 IEEE80211_STA_CONNECTION_POLL))) {
497 s32 beaconint_us;
498
499 if (latency < 0)
500 latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
501
502 beaconint_us = ieee80211_tu_to_usec(
503 found->vif.bss_conf.beacon_int);
504
505 if (beaconint_us > latency) {
506 local->ps_sdata = NULL;
507 } else {
508 struct ieee80211_bss *bss;
509 int maxslp = 1;
510 u8 dtimper;
511
512 bss = (void *)found->u.mgd.associated->priv;
513 dtimper = bss->dtim_period;
514
515 /* If the TIM IE is invalid, pretend the value is 1 */
516 if (!dtimper)
517 dtimper = 1;
518 else if (dtimper > 1)
519 maxslp = min_t(int, dtimper,
520 latency / beaconint_us);
521
522 local->hw.conf.max_sleep_period = maxslp;
523 local->hw.conf.ps_dtim_period = dtimper;
524 local->ps_sdata = found;
525 }
526 } else {
527 local->ps_sdata = NULL;
528 }
529
530 change:
531 ieee80211_change_ps(local);
532 }
533
534 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
535 {
536 struct ieee80211_local *local =
537 container_of(work, struct ieee80211_local,
538 dynamic_ps_disable_work);
539
540 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
541 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
542 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
543 }
544
545 ieee80211_wake_queues_by_reason(&local->hw,
546 IEEE80211_QUEUE_STOP_REASON_PS);
547 }
548
549 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
550 {
551 struct ieee80211_local *local =
552 container_of(work, struct ieee80211_local,
553 dynamic_ps_enable_work);
554 struct ieee80211_sub_if_data *sdata = local->ps_sdata;
555 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
556
557 /* can only happen when PS was just disabled anyway */
558 if (!sdata)
559 return;
560
561 if (local->hw.conf.flags & IEEE80211_CONF_PS)
562 return;
563
564 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
565 (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
566 ieee80211_send_nullfunc(local, sdata, 1);
567
568 if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) ||
569 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
570 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
571 local->hw.conf.flags |= IEEE80211_CONF_PS;
572 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
573 }
574 }
575
576 void ieee80211_dynamic_ps_timer(unsigned long data)
577 {
578 struct ieee80211_local *local = (void *) data;
579
580 if (local->quiescing || local->suspended)
581 return;
582
583 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
584 }
585
586 /* MLME */
587 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
588 struct ieee80211_if_managed *ifmgd,
589 u8 *wmm_param, size_t wmm_param_len)
590 {
591 struct ieee80211_tx_queue_params params;
592 size_t left;
593 int count;
594 u8 *pos, uapsd_queues = 0;
595
596 if (!local->ops->conf_tx)
597 return;
598
599 if (local->hw.queues < 4)
600 return;
601
602 if (!wmm_param)
603 return;
604
605 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
606 return;
607
608 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
609 uapsd_queues = local->uapsd_queues;
610
611 count = wmm_param[6] & 0x0f;
612 if (count == ifmgd->wmm_last_param_set)
613 return;
614 ifmgd->wmm_last_param_set = count;
615
616 pos = wmm_param + 8;
617 left = wmm_param_len - 8;
618
619 memset(&params, 0, sizeof(params));
620
621 local->wmm_acm = 0;
622 for (; left >= 4; left -= 4, pos += 4) {
623 int aci = (pos[0] >> 5) & 0x03;
624 int acm = (pos[0] >> 4) & 0x01;
625 bool uapsd = false;
626 int queue;
627
628 switch (aci) {
629 case 1: /* AC_BK */
630 queue = 3;
631 if (acm)
632 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
633 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
634 uapsd = true;
635 break;
636 case 2: /* AC_VI */
637 queue = 1;
638 if (acm)
639 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
640 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
641 uapsd = true;
642 break;
643 case 3: /* AC_VO */
644 queue = 0;
645 if (acm)
646 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
647 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
648 uapsd = true;
649 break;
650 case 0: /* AC_BE */
651 default:
652 queue = 2;
653 if (acm)
654 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
655 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
656 uapsd = true;
657 break;
658 }
659
660 params.aifs = pos[0] & 0x0f;
661 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
662 params.cw_min = ecw2cw(pos[1] & 0x0f);
663 params.txop = get_unaligned_le16(pos + 2);
664 params.uapsd = uapsd;
665
666 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
667 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
668 "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
669 wiphy_name(local->hw.wiphy), queue, aci, acm,
670 params.aifs, params.cw_min, params.cw_max, params.txop,
671 params.uapsd);
672 #endif
673 if (drv_conf_tx(local, queue, &params))
674 printk(KERN_DEBUG "%s: failed to set TX queue "
675 "parameters for queue %d\n",
676 wiphy_name(local->hw.wiphy), queue);
677 }
678
679 /* enable WMM or activate new settings */
680 local->hw.conf.flags |= IEEE80211_CONF_QOS;
681 drv_config(local, IEEE80211_CONF_CHANGE_QOS);
682 }
683
684 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
685 u16 capab, bool erp_valid, u8 erp)
686 {
687 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
688 u32 changed = 0;
689 bool use_protection;
690 bool use_short_preamble;
691 bool use_short_slot;
692
693 if (erp_valid) {
694 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
695 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
696 } else {
697 use_protection = false;
698 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
699 }
700
701 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
702 if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
703 use_short_slot = true;
704
705 if (use_protection != bss_conf->use_cts_prot) {
706 bss_conf->use_cts_prot = use_protection;
707 changed |= BSS_CHANGED_ERP_CTS_PROT;
708 }
709
710 if (use_short_preamble != bss_conf->use_short_preamble) {
711 bss_conf->use_short_preamble = use_short_preamble;
712 changed |= BSS_CHANGED_ERP_PREAMBLE;
713 }
714
715 if (use_short_slot != bss_conf->use_short_slot) {
716 bss_conf->use_short_slot = use_short_slot;
717 changed |= BSS_CHANGED_ERP_SLOT;
718 }
719
720 return changed;
721 }
722
723 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
724 struct cfg80211_bss *cbss,
725 u32 bss_info_changed)
726 {
727 struct ieee80211_bss *bss = (void *)cbss->priv;
728 struct ieee80211_local *local = sdata->local;
729
730 bss_info_changed |= BSS_CHANGED_ASSOC;
731 /* set timing information */
732 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
733 sdata->vif.bss_conf.timestamp = cbss->tsf;
734
735 bss_info_changed |= BSS_CHANGED_BEACON_INT;
736 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
737 cbss->capability, bss->has_erp_value, bss->erp_value);
738
739 sdata->u.mgd.associated = cbss;
740 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
741
742 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
743
744 /* just to be sure */
745 sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
746 IEEE80211_STA_BEACON_POLL);
747
748 /*
749 * Always handle WMM once after association regardless
750 * of the first value the AP uses. Setting -1 here has
751 * that effect because the AP values is an unsigned
752 * 4-bit value.
753 */
754 sdata->u.mgd.wmm_last_param_set = -1;
755
756 ieee80211_led_assoc(local, 1);
757
758 sdata->vif.bss_conf.assoc = 1;
759 /*
760 * For now just always ask the driver to update the basic rateset
761 * when we have associated, we aren't checking whether it actually
762 * changed or not.
763 */
764 bss_info_changed |= BSS_CHANGED_BASIC_RATES;
765
766 /* And the BSSID changed - we're associated now */
767 bss_info_changed |= BSS_CHANGED_BSSID;
768
769 /* Tell the driver to monitor connection quality (if supported) */
770 if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
771 sdata->vif.bss_conf.cqm_rssi_thold)
772 bss_info_changed |= BSS_CHANGED_CQM;
773
774 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
775
776 mutex_lock(&local->iflist_mtx);
777 ieee80211_recalc_ps(local, -1);
778 ieee80211_recalc_smps(local, sdata);
779 mutex_unlock(&local->iflist_mtx);
780
781 netif_tx_start_all_queues(sdata->dev);
782 netif_carrier_on(sdata->dev);
783 }
784
785 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
786 bool remove_sta)
787 {
788 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
789 struct ieee80211_local *local = sdata->local;
790 struct sta_info *sta;
791 u32 changed = 0, config_changed = 0;
792 u8 bssid[ETH_ALEN];
793
794 ASSERT_MGD_MTX(ifmgd);
795
796 if (WARN_ON(!ifmgd->associated))
797 return;
798
799 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
800
801 ifmgd->associated = NULL;
802 memset(ifmgd->bssid, 0, ETH_ALEN);
803
804 /*
805 * we need to commit the associated = NULL change because the
806 * scan code uses that to determine whether this iface should
807 * go to/wake up from powersave or not -- and could otherwise
808 * wake the queues erroneously.
809 */
810 smp_mb();
811
812 /*
813 * Thus, we can only afterwards stop the queues -- to account
814 * for the case where another CPU is finishing a scan at this
815 * time -- we don't want the scan code to enable queues.
816 */
817
818 netif_tx_stop_all_queues(sdata->dev);
819 netif_carrier_off(sdata->dev);
820
821 rcu_read_lock();
822 sta = sta_info_get(sdata, bssid);
823 if (sta) {
824 set_sta_flags(sta, WLAN_STA_DISASSOC);
825 ieee80211_sta_tear_down_BA_sessions(sta);
826 }
827 rcu_read_unlock();
828
829 changed |= ieee80211_reset_erp_info(sdata);
830
831 ieee80211_led_assoc(local, 0);
832 changed |= BSS_CHANGED_ASSOC;
833 sdata->vif.bss_conf.assoc = false;
834
835 ieee80211_set_wmm_default(sdata);
836
837 /* channel(_type) changes are handled by ieee80211_hw_config */
838 local->oper_channel_type = NL80211_CHAN_NO_HT;
839
840 /* on the next assoc, re-program HT parameters */
841 sdata->ht_opmode_valid = false;
842
843 local->power_constr_level = 0;
844
845 del_timer_sync(&local->dynamic_ps_timer);
846 cancel_work_sync(&local->dynamic_ps_enable_work);
847
848 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
849 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
850 config_changed |= IEEE80211_CONF_CHANGE_PS;
851 }
852
853 ieee80211_hw_config(local, config_changed);
854
855 /* And the BSSID changed -- not very interesting here */
856 changed |= BSS_CHANGED_BSSID;
857 ieee80211_bss_info_change_notify(sdata, changed);
858
859 if (remove_sta)
860 sta_info_destroy_addr(sdata, bssid);
861 }
862
863 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
864 struct ieee80211_hdr *hdr)
865 {
866 /*
867 * We can postpone the mgd.timer whenever receiving unicast frames
868 * from AP because we know that the connection is working both ways
869 * at that time. But multicast frames (and hence also beacons) must
870 * be ignored here, because we need to trigger the timer during
871 * data idle periods for sending the periodic probe request to the
872 * AP we're connected to.
873 */
874 if (is_multicast_ether_addr(hdr->addr1))
875 return;
876
877 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
878 return;
879
880 mod_timer(&sdata->u.mgd.conn_mon_timer,
881 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
882 }
883
884 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
885 {
886 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
887 const u8 *ssid;
888
889 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
890 ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
891 ssid + 2, ssid[1], NULL, 0);
892
893 ifmgd->probe_send_count++;
894 ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
895 run_again(ifmgd, ifmgd->probe_timeout);
896 }
897
898 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
899 bool beacon)
900 {
901 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
902 bool already = false;
903
904 if (!ieee80211_sdata_running(sdata))
905 return;
906
907 if (sdata->local->scanning)
908 return;
909
910 if (sdata->local->tmp_channel)
911 return;
912
913 mutex_lock(&ifmgd->mtx);
914
915 if (!ifmgd->associated)
916 goto out;
917
918 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
919 if (beacon && net_ratelimit())
920 printk(KERN_DEBUG "%s: detected beacon loss from AP "
921 "- sending probe request\n", sdata->name);
922 #endif
923
924 /*
925 * The driver/our work has already reported this event or the
926 * connection monitoring has kicked in and we have already sent
927 * a probe request. Or maybe the AP died and the driver keeps
928 * reporting until we disassociate...
929 *
930 * In either case we have to ignore the current call to this
931 * function (except for setting the correct probe reason bit)
932 * because otherwise we would reset the timer every time and
933 * never check whether we received a probe response!
934 */
935 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
936 IEEE80211_STA_CONNECTION_POLL))
937 already = true;
938
939 if (beacon)
940 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
941 else
942 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
943
944 if (already)
945 goto out;
946
947 mutex_lock(&sdata->local->iflist_mtx);
948 ieee80211_recalc_ps(sdata->local, -1);
949 mutex_unlock(&sdata->local->iflist_mtx);
950
951 ifmgd->probe_send_count = 0;
952 ieee80211_mgd_probe_ap_send(sdata);
953 out:
954 mutex_unlock(&ifmgd->mtx);
955 }
956
957 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
958 {
959 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
960 struct ieee80211_local *local = sdata->local;
961 u8 bssid[ETH_ALEN];
962
963 mutex_lock(&ifmgd->mtx);
964 if (!ifmgd->associated) {
965 mutex_unlock(&ifmgd->mtx);
966 return;
967 }
968
969 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
970
971 printk(KERN_DEBUG "Connection to AP %pM lost.\n", bssid);
972
973 ieee80211_set_disassoc(sdata, true);
974 ieee80211_recalc_idle(local);
975 mutex_unlock(&ifmgd->mtx);
976 /*
977 * must be outside lock due to cfg80211,
978 * but that's not a problem.
979 */
980 ieee80211_send_deauth_disassoc(sdata, bssid,
981 IEEE80211_STYPE_DEAUTH,
982 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
983 NULL);
984 }
985
986 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
987 {
988 struct ieee80211_sub_if_data *sdata =
989 container_of(work, struct ieee80211_sub_if_data,
990 u.mgd.beacon_connection_loss_work);
991
992 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
993 __ieee80211_connection_loss(sdata);
994 else
995 ieee80211_mgd_probe_ap(sdata, true);
996 }
997
998 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
999 {
1000 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1001 struct ieee80211_hw *hw = &sdata->local->hw;
1002
1003 WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1004 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1005 }
1006 EXPORT_SYMBOL(ieee80211_beacon_loss);
1007
1008 void ieee80211_connection_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 WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1014 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1015 }
1016 EXPORT_SYMBOL(ieee80211_connection_loss);
1017
1018
1019 static enum rx_mgmt_action __must_check
1020 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1021 struct ieee80211_mgmt *mgmt, size_t len)
1022 {
1023 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1024 const u8 *bssid = NULL;
1025 u16 reason_code;
1026
1027 if (len < 24 + 2)
1028 return RX_MGMT_NONE;
1029
1030 ASSERT_MGD_MTX(ifmgd);
1031
1032 bssid = ifmgd->associated->bssid;
1033
1034 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1035
1036 printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1037 sdata->name, bssid, reason_code);
1038
1039 ieee80211_set_disassoc(sdata, true);
1040 ieee80211_recalc_idle(sdata->local);
1041
1042 return RX_MGMT_CFG80211_DEAUTH;
1043 }
1044
1045
1046 static enum rx_mgmt_action __must_check
1047 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1048 struct ieee80211_mgmt *mgmt, size_t len)
1049 {
1050 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1051 u16 reason_code;
1052
1053 if (len < 24 + 2)
1054 return RX_MGMT_NONE;
1055
1056 ASSERT_MGD_MTX(ifmgd);
1057
1058 if (WARN_ON(!ifmgd->associated))
1059 return RX_MGMT_NONE;
1060
1061 if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1062 return RX_MGMT_NONE;
1063
1064 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1065
1066 printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1067 sdata->name, mgmt->sa, reason_code);
1068
1069 ieee80211_set_disassoc(sdata, true);
1070 ieee80211_recalc_idle(sdata->local);
1071 return RX_MGMT_CFG80211_DISASSOC;
1072 }
1073
1074
1075 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1076 struct ieee80211_mgmt *mgmt, size_t len)
1077 {
1078 struct ieee80211_sub_if_data *sdata = wk->sdata;
1079 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1080 struct ieee80211_local *local = sdata->local;
1081 struct ieee80211_supported_band *sband;
1082 struct sta_info *sta;
1083 struct cfg80211_bss *cbss = wk->assoc.bss;
1084 u8 *pos;
1085 u32 rates, basic_rates;
1086 u16 capab_info, aid;
1087 struct ieee802_11_elems elems;
1088 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1089 u32 changed = 0;
1090 int i, j, err;
1091 bool have_higher_than_11mbit = false;
1092 u16 ap_ht_cap_flags;
1093
1094 /* AssocResp and ReassocResp have identical structure */
1095
1096 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1097 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1098
1099 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1100 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1101 "set\n", sdata->name, aid);
1102 aid &= ~(BIT(15) | BIT(14));
1103
1104 pos = mgmt->u.assoc_resp.variable;
1105 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1106
1107 if (!elems.supp_rates) {
1108 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1109 sdata->name);
1110 return false;
1111 }
1112
1113 ifmgd->aid = aid;
1114
1115 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1116 if (!sta) {
1117 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1118 " the AP\n", sdata->name);
1119 return false;
1120 }
1121
1122 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1123 WLAN_STA_ASSOC_AP);
1124 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1125 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1126
1127 rates = 0;
1128 basic_rates = 0;
1129 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1130
1131 for (i = 0; i < elems.supp_rates_len; i++) {
1132 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1133 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1134
1135 if (rate > 110)
1136 have_higher_than_11mbit = true;
1137
1138 for (j = 0; j < sband->n_bitrates; j++) {
1139 if (sband->bitrates[j].bitrate == rate) {
1140 rates |= BIT(j);
1141 if (is_basic)
1142 basic_rates |= BIT(j);
1143 break;
1144 }
1145 }
1146 }
1147
1148 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1149 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1150 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1151
1152 if (rate > 110)
1153 have_higher_than_11mbit = true;
1154
1155 for (j = 0; j < sband->n_bitrates; j++) {
1156 if (sband->bitrates[j].bitrate == rate) {
1157 rates |= BIT(j);
1158 if (is_basic)
1159 basic_rates |= BIT(j);
1160 break;
1161 }
1162 }
1163 }
1164
1165 sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1166 sdata->vif.bss_conf.basic_rates = basic_rates;
1167
1168 /* cf. IEEE 802.11 9.2.12 */
1169 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1170 have_higher_than_11mbit)
1171 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1172 else
1173 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1174
1175 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1176 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1177 elems.ht_cap_elem, &sta->sta.ht_cap);
1178
1179 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1180
1181 rate_control_rate_init(sta);
1182
1183 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1184 set_sta_flags(sta, WLAN_STA_MFP);
1185
1186 if (elems.wmm_param)
1187 set_sta_flags(sta, WLAN_STA_WME);
1188
1189 err = sta_info_insert(sta);
1190 sta = NULL;
1191 if (err) {
1192 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1193 " the AP (error %d)\n", sdata->name, err);
1194 return false;
1195 }
1196
1197 if (elems.wmm_param)
1198 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1199 elems.wmm_param_len);
1200 else
1201 ieee80211_set_wmm_default(sdata);
1202
1203 local->oper_channel = wk->chan;
1204
1205 if (elems.ht_info_elem && elems.wmm_param &&
1206 (sdata->local->hw.queues >= 4) &&
1207 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1208 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1209 cbss->bssid, ap_ht_cap_flags);
1210
1211 /* set AID and assoc capability,
1212 * ieee80211_set_associated() will tell the driver */
1213 bss_conf->aid = aid;
1214 bss_conf->assoc_capability = capab_info;
1215 ieee80211_set_associated(sdata, cbss, changed);
1216
1217 /*
1218 * If we're using 4-addr mode, let the AP know that we're
1219 * doing so, so that it can create the STA VLAN on its side
1220 */
1221 if (ifmgd->use_4addr)
1222 ieee80211_send_4addr_nullfunc(local, sdata);
1223
1224 /*
1225 * Start timer to probe the connection to the AP now.
1226 * Also start the timer that will detect beacon loss.
1227 */
1228 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1229 mod_beacon_timer(sdata);
1230
1231 return true;
1232 }
1233
1234
1235 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1236 struct ieee80211_mgmt *mgmt,
1237 size_t len,
1238 struct ieee80211_rx_status *rx_status,
1239 struct ieee802_11_elems *elems,
1240 bool beacon)
1241 {
1242 struct ieee80211_local *local = sdata->local;
1243 int freq;
1244 struct ieee80211_bss *bss;
1245 struct ieee80211_channel *channel;
1246 bool need_ps = false;
1247
1248 if (sdata->u.mgd.associated) {
1249 bss = (void *)sdata->u.mgd.associated->priv;
1250 /* not previously set so we may need to recalc */
1251 need_ps = !bss->dtim_period;
1252 }
1253
1254 if (elems->ds_params && elems->ds_params_len == 1)
1255 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1256 else
1257 freq = rx_status->freq;
1258
1259 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1260
1261 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1262 return;
1263
1264 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1265 channel, beacon);
1266 if (bss)
1267 ieee80211_rx_bss_put(local, bss);
1268
1269 if (!sdata->u.mgd.associated)
1270 return;
1271
1272 if (need_ps) {
1273 mutex_lock(&local->iflist_mtx);
1274 ieee80211_recalc_ps(local, -1);
1275 mutex_unlock(&local->iflist_mtx);
1276 }
1277
1278 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1279 (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1280 ETH_ALEN) == 0)) {
1281 struct ieee80211_channel_sw_ie *sw_elem =
1282 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1283 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1284 }
1285 }
1286
1287
1288 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1289 struct sk_buff *skb)
1290 {
1291 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1292 struct ieee80211_if_managed *ifmgd;
1293 struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1294 size_t baselen, len = skb->len;
1295 struct ieee802_11_elems elems;
1296
1297 ifmgd = &sdata->u.mgd;
1298
1299 ASSERT_MGD_MTX(ifmgd);
1300
1301 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1302 return; /* ignore ProbeResp to foreign address */
1303
1304 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1305 if (baselen > len)
1306 return;
1307
1308 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1309 &elems);
1310
1311 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1312
1313 if (ifmgd->associated &&
1314 memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1315 ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1316 IEEE80211_STA_CONNECTION_POLL)) {
1317 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1318 IEEE80211_STA_BEACON_POLL);
1319 mutex_lock(&sdata->local->iflist_mtx);
1320 ieee80211_recalc_ps(sdata->local, -1);
1321 mutex_unlock(&sdata->local->iflist_mtx);
1322 /*
1323 * We've received a probe response, but are not sure whether
1324 * we have or will be receiving any beacons or data, so let's
1325 * schedule the timers again, just in case.
1326 */
1327 mod_beacon_timer(sdata);
1328 mod_timer(&ifmgd->conn_mon_timer,
1329 round_jiffies_up(jiffies +
1330 IEEE80211_CONNECTION_IDLE_TIME));
1331 }
1332 }
1333
1334 /*
1335 * This is the canonical list of information elements we care about,
1336 * the filter code also gives us all changes to the Microsoft OUI
1337 * (00:50:F2) vendor IE which is used for WMM which we need to track.
1338 *
1339 * We implement beacon filtering in software since that means we can
1340 * avoid processing the frame here and in cfg80211, and userspace
1341 * will not be able to tell whether the hardware supports it or not.
1342 *
1343 * XXX: This list needs to be dynamic -- userspace needs to be able to
1344 * add items it requires. It also needs to be able to tell us to
1345 * look out for other vendor IEs.
1346 */
1347 static const u64 care_about_ies =
1348 (1ULL << WLAN_EID_COUNTRY) |
1349 (1ULL << WLAN_EID_ERP_INFO) |
1350 (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1351 (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1352 (1ULL << WLAN_EID_HT_CAPABILITY) |
1353 (1ULL << WLAN_EID_HT_INFORMATION);
1354
1355 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1356 struct ieee80211_mgmt *mgmt,
1357 size_t len,
1358 struct ieee80211_rx_status *rx_status)
1359 {
1360 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1361 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1362 size_t baselen;
1363 struct ieee802_11_elems elems;
1364 struct ieee80211_local *local = sdata->local;
1365 u32 changed = 0;
1366 bool erp_valid, directed_tim = false;
1367 u8 erp_value = 0;
1368 u32 ncrc;
1369 u8 *bssid;
1370
1371 ASSERT_MGD_MTX(ifmgd);
1372
1373 /* Process beacon from the current BSS */
1374 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1375 if (baselen > len)
1376 return;
1377
1378 if (rx_status->freq != local->hw.conf.channel->center_freq)
1379 return;
1380
1381 /*
1382 * We might have received a number of frames, among them a
1383 * disassoc frame and a beacon...
1384 */
1385 if (!ifmgd->associated)
1386 return;
1387
1388 bssid = ifmgd->associated->bssid;
1389
1390 /*
1391 * And in theory even frames from a different AP we were just
1392 * associated to a split-second ago!
1393 */
1394 if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1395 return;
1396
1397 /* Track average RSSI from the Beacon frames of the current AP */
1398 ifmgd->last_beacon_signal = rx_status->signal;
1399 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1400 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1401 ifmgd->ave_beacon_signal = rx_status->signal;
1402 ifmgd->last_cqm_event_signal = 0;
1403 } else {
1404 ifmgd->ave_beacon_signal =
1405 (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1406 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1407 ifmgd->ave_beacon_signal) / 16;
1408 }
1409 if (bss_conf->cqm_rssi_thold &&
1410 !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1411 int sig = ifmgd->ave_beacon_signal / 16;
1412 int last_event = ifmgd->last_cqm_event_signal;
1413 int thold = bss_conf->cqm_rssi_thold;
1414 int hyst = bss_conf->cqm_rssi_hyst;
1415 if (sig < thold &&
1416 (last_event == 0 || sig < last_event - hyst)) {
1417 ifmgd->last_cqm_event_signal = sig;
1418 ieee80211_cqm_rssi_notify(
1419 &sdata->vif,
1420 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1421 GFP_KERNEL);
1422 } else if (sig > thold &&
1423 (last_event == 0 || sig > last_event + hyst)) {
1424 ifmgd->last_cqm_event_signal = sig;
1425 ieee80211_cqm_rssi_notify(
1426 &sdata->vif,
1427 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1428 GFP_KERNEL);
1429 }
1430 }
1431
1432 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1433 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1434 if (net_ratelimit()) {
1435 printk(KERN_DEBUG "%s: cancelling probereq poll due "
1436 "to a received beacon\n", sdata->name);
1437 }
1438 #endif
1439 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1440 mutex_lock(&local->iflist_mtx);
1441 ieee80211_recalc_ps(local, -1);
1442 mutex_unlock(&local->iflist_mtx);
1443 }
1444
1445 /*
1446 * Push the beacon loss detection into the future since
1447 * we are processing a beacon from the AP just now.
1448 */
1449 mod_beacon_timer(sdata);
1450
1451 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1452 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1453 len - baselen, &elems,
1454 care_about_ies, ncrc);
1455
1456 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1457 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1458 ifmgd->aid);
1459
1460 if (ncrc != ifmgd->beacon_crc) {
1461 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1462 true);
1463
1464 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1465 elems.wmm_param_len);
1466 }
1467
1468 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1469 if (directed_tim) {
1470 if (local->hw.conf.dynamic_ps_timeout > 0) {
1471 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1472 ieee80211_hw_config(local,
1473 IEEE80211_CONF_CHANGE_PS);
1474 ieee80211_send_nullfunc(local, sdata, 0);
1475 } else {
1476 local->pspolling = true;
1477
1478 /*
1479 * Here is assumed that the driver will be
1480 * able to send ps-poll frame and receive a
1481 * response even though power save mode is
1482 * enabled, but some drivers might require
1483 * to disable power save here. This needs
1484 * to be investigated.
1485 */
1486 ieee80211_send_pspoll(local, sdata);
1487 }
1488 }
1489 }
1490
1491 if (ncrc == ifmgd->beacon_crc)
1492 return;
1493 ifmgd->beacon_crc = ncrc;
1494
1495 if (elems.erp_info && elems.erp_info_len >= 1) {
1496 erp_valid = true;
1497 erp_value = elems.erp_info[0];
1498 } else {
1499 erp_valid = false;
1500 }
1501 changed |= ieee80211_handle_bss_capability(sdata,
1502 le16_to_cpu(mgmt->u.beacon.capab_info),
1503 erp_valid, erp_value);
1504
1505
1506 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1507 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1508 struct sta_info *sta;
1509 struct ieee80211_supported_band *sband;
1510 u16 ap_ht_cap_flags;
1511
1512 rcu_read_lock();
1513
1514 sta = sta_info_get(sdata, bssid);
1515 if (WARN_ON(!sta)) {
1516 rcu_read_unlock();
1517 return;
1518 }
1519
1520 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1521
1522 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1523 elems.ht_cap_elem, &sta->sta.ht_cap);
1524
1525 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1526
1527 rcu_read_unlock();
1528
1529 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1530 bssid, ap_ht_cap_flags);
1531 }
1532
1533 /* Note: country IE parsing is done for us by cfg80211 */
1534 if (elems.country_elem) {
1535 /* TODO: IBSS also needs this */
1536 if (elems.pwr_constr_elem)
1537 ieee80211_handle_pwr_constr(sdata,
1538 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1539 elems.pwr_constr_elem,
1540 elems.pwr_constr_elem_len);
1541 }
1542
1543 ieee80211_bss_info_change_notify(sdata, changed);
1544 }
1545
1546 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1547 struct sk_buff *skb)
1548 {
1549 struct ieee80211_local *local = sdata->local;
1550 struct ieee80211_mgmt *mgmt;
1551 u16 fc;
1552
1553 if (skb->len < 24)
1554 return RX_DROP_MONITOR;
1555
1556 mgmt = (struct ieee80211_mgmt *) skb->data;
1557 fc = le16_to_cpu(mgmt->frame_control);
1558
1559 switch (fc & IEEE80211_FCTL_STYPE) {
1560 case IEEE80211_STYPE_PROBE_RESP:
1561 case IEEE80211_STYPE_BEACON:
1562 case IEEE80211_STYPE_DEAUTH:
1563 case IEEE80211_STYPE_DISASSOC:
1564 case IEEE80211_STYPE_ACTION:
1565 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1566 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
1567 return RX_QUEUED;
1568 }
1569
1570 return RX_DROP_MONITOR;
1571 }
1572
1573 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1574 struct sk_buff *skb)
1575 {
1576 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1577 struct ieee80211_rx_status *rx_status;
1578 struct ieee80211_mgmt *mgmt;
1579 enum rx_mgmt_action rma = RX_MGMT_NONE;
1580 u16 fc;
1581
1582 rx_status = (struct ieee80211_rx_status *) skb->cb;
1583 mgmt = (struct ieee80211_mgmt *) skb->data;
1584 fc = le16_to_cpu(mgmt->frame_control);
1585
1586 mutex_lock(&ifmgd->mtx);
1587
1588 if (ifmgd->associated &&
1589 memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1590 switch (fc & IEEE80211_FCTL_STYPE) {
1591 case IEEE80211_STYPE_BEACON:
1592 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1593 rx_status);
1594 break;
1595 case IEEE80211_STYPE_PROBE_RESP:
1596 ieee80211_rx_mgmt_probe_resp(sdata, skb);
1597 break;
1598 case IEEE80211_STYPE_DEAUTH:
1599 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1600 break;
1601 case IEEE80211_STYPE_DISASSOC:
1602 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1603 break;
1604 case IEEE80211_STYPE_ACTION:
1605 if (mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
1606 break;
1607
1608 ieee80211_sta_process_chanswitch(sdata,
1609 &mgmt->u.action.u.chan_switch.sw_elem,
1610 (void *)ifmgd->associated->priv);
1611 break;
1612 }
1613 mutex_unlock(&ifmgd->mtx);
1614
1615 switch (rma) {
1616 case RX_MGMT_NONE:
1617 /* no action */
1618 break;
1619 case RX_MGMT_CFG80211_DEAUTH:
1620 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1621 break;
1622 case RX_MGMT_CFG80211_DISASSOC:
1623 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1624 break;
1625 default:
1626 WARN(1, "unexpected: %d", rma);
1627 }
1628 goto out;
1629 }
1630
1631 mutex_unlock(&ifmgd->mtx);
1632
1633 if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1634 (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH)
1635 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1636
1637 out:
1638 kfree_skb(skb);
1639 }
1640
1641 static void ieee80211_sta_timer(unsigned long data)
1642 {
1643 struct ieee80211_sub_if_data *sdata =
1644 (struct ieee80211_sub_if_data *) data;
1645 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1646 struct ieee80211_local *local = sdata->local;
1647
1648 if (local->quiescing) {
1649 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1650 return;
1651 }
1652
1653 ieee80211_queue_work(&local->hw, &ifmgd->work);
1654 }
1655
1656 static void ieee80211_sta_work(struct work_struct *work)
1657 {
1658 struct ieee80211_sub_if_data *sdata =
1659 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1660 struct ieee80211_local *local = sdata->local;
1661 struct ieee80211_if_managed *ifmgd;
1662 struct sk_buff *skb;
1663
1664 if (!ieee80211_sdata_running(sdata))
1665 return;
1666
1667 if (local->scanning)
1668 return;
1669
1670 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1671 return;
1672
1673 /*
1674 * ieee80211_queue_work() should have picked up most cases,
1675 * here we'll pick the the rest.
1676 */
1677 if (WARN(local->suspended, "STA MLME work scheduled while "
1678 "going to suspend\n"))
1679 return;
1680
1681 ifmgd = &sdata->u.mgd;
1682
1683 /* first process frames to avoid timing out while a frame is pending */
1684 while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1685 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1686
1687 /* then process the rest of the work */
1688 mutex_lock(&ifmgd->mtx);
1689
1690 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1691 IEEE80211_STA_CONNECTION_POLL) &&
1692 ifmgd->associated) {
1693 u8 bssid[ETH_ALEN];
1694
1695 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1696 if (time_is_after_jiffies(ifmgd->probe_timeout))
1697 run_again(ifmgd, ifmgd->probe_timeout);
1698
1699 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1700 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1701 printk(KERN_DEBUG "No probe response from AP %pM"
1702 " after %dms, try %d\n", bssid,
1703 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1704 ifmgd->probe_send_count);
1705 #endif
1706 ieee80211_mgd_probe_ap_send(sdata);
1707 } else {
1708 /*
1709 * We actually lost the connection ... or did we?
1710 * Let's make sure!
1711 */
1712 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1713 IEEE80211_STA_BEACON_POLL);
1714 printk(KERN_DEBUG "No probe response from AP %pM"
1715 " after %dms, disconnecting.\n",
1716 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1717 ieee80211_set_disassoc(sdata, true);
1718 ieee80211_recalc_idle(local);
1719 mutex_unlock(&ifmgd->mtx);
1720 /*
1721 * must be outside lock due to cfg80211,
1722 * but that's not a problem.
1723 */
1724 ieee80211_send_deauth_disassoc(sdata, bssid,
1725 IEEE80211_STYPE_DEAUTH,
1726 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1727 NULL);
1728 mutex_lock(&ifmgd->mtx);
1729 }
1730 }
1731
1732 mutex_unlock(&ifmgd->mtx);
1733 }
1734
1735 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1736 {
1737 struct ieee80211_sub_if_data *sdata =
1738 (struct ieee80211_sub_if_data *) data;
1739 struct ieee80211_local *local = sdata->local;
1740
1741 if (local->quiescing)
1742 return;
1743
1744 ieee80211_queue_work(&sdata->local->hw,
1745 &sdata->u.mgd.beacon_connection_loss_work);
1746 }
1747
1748 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1749 {
1750 struct ieee80211_sub_if_data *sdata =
1751 (struct ieee80211_sub_if_data *) data;
1752 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1753 struct ieee80211_local *local = sdata->local;
1754
1755 if (local->quiescing)
1756 return;
1757
1758 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1759 }
1760
1761 static void ieee80211_sta_monitor_work(struct work_struct *work)
1762 {
1763 struct ieee80211_sub_if_data *sdata =
1764 container_of(work, struct ieee80211_sub_if_data,
1765 u.mgd.monitor_work);
1766
1767 ieee80211_mgd_probe_ap(sdata, false);
1768 }
1769
1770 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1771 {
1772 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1773 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1774 IEEE80211_STA_CONNECTION_POLL);
1775
1776 /* let's probe the connection once */
1777 ieee80211_queue_work(&sdata->local->hw,
1778 &sdata->u.mgd.monitor_work);
1779 /* and do all the other regular work too */
1780 ieee80211_queue_work(&sdata->local->hw,
1781 &sdata->u.mgd.work);
1782 }
1783 }
1784
1785 #ifdef CONFIG_PM
1786 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1787 {
1788 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1789
1790 /*
1791 * we need to use atomic bitops for the running bits
1792 * only because both timers might fire at the same
1793 * time -- the code here is properly synchronised.
1794 */
1795
1796 cancel_work_sync(&ifmgd->work);
1797 cancel_work_sync(&ifmgd->beacon_connection_loss_work);
1798 if (del_timer_sync(&ifmgd->timer))
1799 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1800
1801 cancel_work_sync(&ifmgd->chswitch_work);
1802 if (del_timer_sync(&ifmgd->chswitch_timer))
1803 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1804
1805 cancel_work_sync(&ifmgd->monitor_work);
1806 /* these will just be re-established on connection */
1807 del_timer_sync(&ifmgd->conn_mon_timer);
1808 del_timer_sync(&ifmgd->bcn_mon_timer);
1809 }
1810
1811 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1812 {
1813 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1814
1815 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1816 add_timer(&ifmgd->timer);
1817 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1818 add_timer(&ifmgd->chswitch_timer);
1819 }
1820 #endif
1821
1822 /* interface setup */
1823 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1824 {
1825 struct ieee80211_if_managed *ifmgd;
1826
1827 ifmgd = &sdata->u.mgd;
1828 INIT_WORK(&ifmgd->work, ieee80211_sta_work);
1829 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1830 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1831 INIT_WORK(&ifmgd->beacon_connection_loss_work,
1832 ieee80211_beacon_connection_loss_work);
1833 setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1834 (unsigned long) sdata);
1835 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1836 (unsigned long) sdata);
1837 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1838 (unsigned long) sdata);
1839 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1840 (unsigned long) sdata);
1841 skb_queue_head_init(&ifmgd->skb_queue);
1842
1843 ifmgd->flags = 0;
1844
1845 mutex_init(&ifmgd->mtx);
1846
1847 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1848 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1849 else
1850 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1851 }
1852
1853 /* scan finished notification */
1854 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1855 {
1856 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1857
1858 /* Restart STA timers */
1859 rcu_read_lock();
1860 list_for_each_entry_rcu(sdata, &local->interfaces, list)
1861 ieee80211_restart_sta_timer(sdata);
1862 rcu_read_unlock();
1863 }
1864
1865 int ieee80211_max_network_latency(struct notifier_block *nb,
1866 unsigned long data, void *dummy)
1867 {
1868 s32 latency_usec = (s32) data;
1869 struct ieee80211_local *local =
1870 container_of(nb, struct ieee80211_local,
1871 network_latency_notifier);
1872
1873 mutex_lock(&local->iflist_mtx);
1874 ieee80211_recalc_ps(local, latency_usec);
1875 mutex_unlock(&local->iflist_mtx);
1876
1877 return 0;
1878 }
1879
1880 /* config hooks */
1881 static enum work_done_result
1882 ieee80211_probe_auth_done(struct ieee80211_work *wk,
1883 struct sk_buff *skb)
1884 {
1885 if (!skb) {
1886 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
1887 return WORK_DONE_DESTROY;
1888 }
1889
1890 if (wk->type == IEEE80211_WORK_AUTH) {
1891 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
1892 return WORK_DONE_DESTROY;
1893 }
1894
1895 mutex_lock(&wk->sdata->u.mgd.mtx);
1896 ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
1897 mutex_unlock(&wk->sdata->u.mgd.mtx);
1898
1899 wk->type = IEEE80211_WORK_AUTH;
1900 wk->probe_auth.tries = 0;
1901 return WORK_DONE_REQUEUE;
1902 }
1903
1904 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
1905 struct cfg80211_auth_request *req)
1906 {
1907 const u8 *ssid;
1908 struct ieee80211_work *wk;
1909 u16 auth_alg;
1910
1911 switch (req->auth_type) {
1912 case NL80211_AUTHTYPE_OPEN_SYSTEM:
1913 auth_alg = WLAN_AUTH_OPEN;
1914 break;
1915 case NL80211_AUTHTYPE_SHARED_KEY:
1916 auth_alg = WLAN_AUTH_SHARED_KEY;
1917 break;
1918 case NL80211_AUTHTYPE_FT:
1919 auth_alg = WLAN_AUTH_FT;
1920 break;
1921 case NL80211_AUTHTYPE_NETWORK_EAP:
1922 auth_alg = WLAN_AUTH_LEAP;
1923 break;
1924 default:
1925 return -EOPNOTSUPP;
1926 }
1927
1928 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1929 if (!wk)
1930 return -ENOMEM;
1931
1932 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1933
1934 if (req->ie && req->ie_len) {
1935 memcpy(wk->ie, req->ie, req->ie_len);
1936 wk->ie_len = req->ie_len;
1937 }
1938
1939 if (req->key && req->key_len) {
1940 wk->probe_auth.key_len = req->key_len;
1941 wk->probe_auth.key_idx = req->key_idx;
1942 memcpy(wk->probe_auth.key, req->key, req->key_len);
1943 }
1944
1945 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1946 memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
1947 wk->probe_auth.ssid_len = ssid[1];
1948
1949 wk->probe_auth.algorithm = auth_alg;
1950 wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
1951
1952 /* if we already have a probe, don't probe again */
1953 if (req->bss->proberesp_ies)
1954 wk->type = IEEE80211_WORK_AUTH;
1955 else
1956 wk->type = IEEE80211_WORK_DIRECT_PROBE;
1957 wk->chan = req->bss->channel;
1958 wk->sdata = sdata;
1959 wk->done = ieee80211_probe_auth_done;
1960
1961 ieee80211_add_work(wk);
1962 return 0;
1963 }
1964
1965 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
1966 struct sk_buff *skb)
1967 {
1968 struct ieee80211_mgmt *mgmt;
1969 u16 status;
1970
1971 if (!skb) {
1972 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
1973 return WORK_DONE_DESTROY;
1974 }
1975
1976 mgmt = (void *)skb->data;
1977 status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1978
1979 if (status == WLAN_STATUS_SUCCESS) {
1980 mutex_lock(&wk->sdata->u.mgd.mtx);
1981 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
1982 mutex_unlock(&wk->sdata->u.mgd.mtx);
1983 /* oops -- internal error -- send timeout for now */
1984 cfg80211_send_assoc_timeout(wk->sdata->dev,
1985 wk->filter_ta);
1986 return WORK_DONE_DESTROY;
1987 }
1988 mutex_unlock(&wk->sdata->u.mgd.mtx);
1989 }
1990
1991 cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
1992 return WORK_DONE_DESTROY;
1993 }
1994
1995 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
1996 struct cfg80211_assoc_request *req)
1997 {
1998 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1999 struct ieee80211_bss *bss = (void *)req->bss->priv;
2000 struct ieee80211_work *wk;
2001 const u8 *ssid;
2002 int i;
2003
2004 mutex_lock(&ifmgd->mtx);
2005 if (ifmgd->associated) {
2006 if (!req->prev_bssid ||
2007 memcmp(req->prev_bssid, ifmgd->associated->bssid,
2008 ETH_ALEN)) {
2009 /*
2010 * We are already associated and the request was not a
2011 * reassociation request from the current BSS, so
2012 * reject it.
2013 */
2014 mutex_unlock(&ifmgd->mtx);
2015 return -EALREADY;
2016 }
2017
2018 /* Trying to reassociate - clear previous association state */
2019 ieee80211_set_disassoc(sdata, true);
2020 }
2021 mutex_unlock(&ifmgd->mtx);
2022
2023 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2024 if (!wk)
2025 return -ENOMEM;
2026
2027 ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2028 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2029
2030 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2031 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2032 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2033 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2034 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2035
2036
2037 if (req->ie && req->ie_len) {
2038 memcpy(wk->ie, req->ie, req->ie_len);
2039 wk->ie_len = req->ie_len;
2040 } else
2041 wk->ie_len = 0;
2042
2043 wk->assoc.bss = req->bss;
2044
2045 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2046
2047 /* new association always uses requested smps mode */
2048 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2049 if (ifmgd->powersave)
2050 ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2051 else
2052 ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2053 } else
2054 ifmgd->ap_smps = ifmgd->req_smps;
2055
2056 wk->assoc.smps = ifmgd->ap_smps;
2057 /*
2058 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2059 * We still associate in non-HT mode (11a/b/g) if any one of these
2060 * ciphers is configured as pairwise.
2061 * We can set this to true for non-11n hardware, that'll be checked
2062 * separately along with the peer capabilities.
2063 */
2064 wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2065 wk->assoc.capability = req->bss->capability;
2066 wk->assoc.wmm_used = bss->wmm_used;
2067 wk->assoc.supp_rates = bss->supp_rates;
2068 wk->assoc.supp_rates_len = bss->supp_rates_len;
2069 wk->assoc.ht_information_ie =
2070 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2071
2072 if (bss->wmm_used && bss->uapsd_supported &&
2073 (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2074 wk->assoc.uapsd_used = true;
2075 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2076 } else {
2077 wk->assoc.uapsd_used = false;
2078 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2079 }
2080
2081 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2082 memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2083 wk->assoc.ssid_len = ssid[1];
2084
2085 if (req->prev_bssid)
2086 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2087
2088 wk->type = IEEE80211_WORK_ASSOC;
2089 wk->chan = req->bss->channel;
2090 wk->sdata = sdata;
2091 wk->done = ieee80211_assoc_done;
2092
2093 if (req->use_mfp) {
2094 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2095 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2096 } else {
2097 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2098 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2099 }
2100
2101 if (req->crypto.control_port)
2102 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2103 else
2104 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2105
2106 ieee80211_add_work(wk);
2107 return 0;
2108 }
2109
2110 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2111 struct cfg80211_deauth_request *req,
2112 void *cookie)
2113 {
2114 struct ieee80211_local *local = sdata->local;
2115 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2116 struct ieee80211_work *wk;
2117 const u8 *bssid = req->bss->bssid;
2118
2119 mutex_lock(&ifmgd->mtx);
2120
2121 if (ifmgd->associated == req->bss) {
2122 bssid = req->bss->bssid;
2123 ieee80211_set_disassoc(sdata, true);
2124 mutex_unlock(&ifmgd->mtx);
2125 } else {
2126 bool not_auth_yet = false;
2127
2128 mutex_unlock(&ifmgd->mtx);
2129
2130 mutex_lock(&local->work_mtx);
2131 list_for_each_entry(wk, &local->work_list, list) {
2132 if (wk->sdata != sdata)
2133 continue;
2134
2135 if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2136 wk->type != IEEE80211_WORK_AUTH)
2137 continue;
2138
2139 if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2140 continue;
2141
2142 not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2143 list_del_rcu(&wk->list);
2144 free_work(wk);
2145 break;
2146 }
2147 mutex_unlock(&local->work_mtx);
2148
2149 /*
2150 * If somebody requests authentication and we haven't
2151 * sent out an auth frame yet there's no need to send
2152 * out a deauth frame either. If the state was PROBE,
2153 * then this is the case. If it's AUTH we have sent a
2154 * frame, and if it's IDLE we have completed the auth
2155 * process already.
2156 */
2157 if (not_auth_yet) {
2158 __cfg80211_auth_canceled(sdata->dev, bssid);
2159 return 0;
2160 }
2161 }
2162
2163 printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2164 sdata->name, bssid, req->reason_code);
2165
2166 ieee80211_send_deauth_disassoc(sdata, bssid,
2167 IEEE80211_STYPE_DEAUTH, req->reason_code,
2168 cookie);
2169
2170 ieee80211_recalc_idle(sdata->local);
2171
2172 return 0;
2173 }
2174
2175 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2176 struct cfg80211_disassoc_request *req,
2177 void *cookie)
2178 {
2179 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2180 u8 bssid[ETH_ALEN];
2181
2182 mutex_lock(&ifmgd->mtx);
2183
2184 /*
2185 * cfg80211 should catch this ... but it's racy since
2186 * we can receive a disassoc frame, process it, hand it
2187 * to cfg80211 while that's in a locked section already
2188 * trying to tell us that the user wants to disconnect.
2189 */
2190 if (ifmgd->associated != req->bss) {
2191 mutex_unlock(&ifmgd->mtx);
2192 return -ENOLINK;
2193 }
2194
2195 printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2196 sdata->name, req->bss->bssid, req->reason_code);
2197
2198 memcpy(bssid, req->bss->bssid, ETH_ALEN);
2199 ieee80211_set_disassoc(sdata, false);
2200
2201 mutex_unlock(&ifmgd->mtx);
2202
2203 ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2204 IEEE80211_STYPE_DISASSOC, req->reason_code,
2205 cookie);
2206 sta_info_destroy_addr(sdata, bssid);
2207
2208 ieee80211_recalc_idle(sdata->local);
2209
2210 return 0;
2211 }
2212
2213 int ieee80211_mgd_action(struct ieee80211_sub_if_data *sdata,
2214 struct ieee80211_channel *chan,
2215 enum nl80211_channel_type channel_type,
2216 const u8 *buf, size_t len, u64 *cookie)
2217 {
2218 struct ieee80211_local *local = sdata->local;
2219 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2220 struct sk_buff *skb;
2221
2222 /* Check that we are on the requested channel for transmission */
2223 if ((chan != local->tmp_channel ||
2224 channel_type != local->tmp_channel_type) &&
2225 (chan != local->oper_channel ||
2226 channel_type != local->oper_channel_type))
2227 return -EBUSY;
2228
2229 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len);
2230 if (!skb)
2231 return -ENOMEM;
2232 skb_reserve(skb, local->hw.extra_tx_headroom);
2233
2234 memcpy(skb_put(skb, len), buf, len);
2235
2236 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
2237 IEEE80211_SKB_CB(skb)->flags |=
2238 IEEE80211_TX_INTFL_DONT_ENCRYPT;
2239 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX |
2240 IEEE80211_TX_CTL_REQ_TX_STATUS;
2241 skb->dev = sdata->dev;
2242 ieee80211_tx_skb(sdata, skb);
2243
2244 *cookie = (unsigned long) skb;
2245 return 0;
2246 }
2247
2248 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2249 enum nl80211_cqm_rssi_threshold_event rssi_event,
2250 gfp_t gfp)
2251 {
2252 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2253
2254 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2255 }
2256 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
Linux kernel - Deliverables
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