projects / deliverable / linux.git / blob
? search:


461167dfa42c1f1e6051c97adf5dccdfffb0b09a
[deliverable/linux.git] / net / mac80211 / mlme.c
1 /*
2 * BSS client mode implementation
3 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4 * Copyright 2004, Instant802 Networks, Inc.
5 * Copyright 2005, Devicescape Software, Inc.
6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14 #include <linux/delay.h>
15 #include <linux/if_ether.h>
16 #include <linux/skbuff.h>
17 #include <linux/if_arp.h>
18 #include <linux/etherdevice.h>
19 #include <linux/rtnetlink.h>
20 #include <linux/pm_qos_params.h>
21 #include <linux/crc32.h>
22 #include <net/mac80211.h>
23 #include <asm/unaligned.h>
24
25 #include "ieee80211_i.h"
26 #include "driver-ops.h"
27 #include "rate.h"
28 #include "led.h"
29
30 #define IEEE80211_MAX_PROBE_TRIES 5
31
32 /*
33 * beacon loss detection timeout
34 * XXX: should depend on beacon interval
35 */
36 #define IEEE80211_BEACON_LOSS_TIME (2 * HZ)
37 /*
38 * Time the connection can be idle before we probe
39 * it to see if we can still talk to the AP.
40 */
41 #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ)
42 /*
43 * Time we wait for a probe response after sending
44 * a probe request because of beacon loss or for
45 * checking the connection still works.
46 */
47 #define IEEE80211_PROBE_WAIT (HZ / 2)
48
49 /*
50 * Weight given to the latest Beacon frame when calculating average signal
51 * strength for Beacon frames received in the current BSS. This must be
52 * between 1 and 15.
53 */
54 #define IEEE80211_SIGNAL_AVE_WEIGHT 3
55
56 #define TMR_RUNNING_TIMER 0
57 #define TMR_RUNNING_CHANSW 1
58
59 /*
60 * All cfg80211 functions have to be called outside a locked
61 * section so that they can acquire a lock themselves... This
62 * is much simpler than queuing up things in cfg80211, but we
63 * do need some indirection for that here.
64 */
65 enum rx_mgmt_action {
66 /* no action required */
67 RX_MGMT_NONE,
68
69 /* caller must call cfg80211_send_rx_auth() */
70 RX_MGMT_CFG80211_AUTH,
71
72 /* caller must call cfg80211_send_rx_assoc() */
73 RX_MGMT_CFG80211_ASSOC,
74
75 /* caller must call cfg80211_send_deauth() */
76 RX_MGMT_CFG80211_DEAUTH,
77
78 /* caller must call cfg80211_send_disassoc() */
79 RX_MGMT_CFG80211_DISASSOC,
80
81 /* caller must tell cfg80211 about internal error */
82 RX_MGMT_CFG80211_ASSOC_ERROR,
83 };
84
85 /* utils */
86 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
87 {
88 WARN_ON(!mutex_is_locked(&ifmgd->mtx));
89 }
90
91 /*
92 * We can have multiple work items (and connection probing)
93 * scheduling this timer, but we need to take care to only
94 * reschedule it when it should fire _earlier_ than it was
95 * asked for before, or if it's not pending right now. This
96 * function ensures that. Note that it then is required to
97 * run this function for all timeouts after the first one
98 * has happened -- the work that runs from this timer will
99 * do that.
100 */
101 static void run_again(struct ieee80211_if_managed *ifmgd,
102 unsigned long timeout)
103 {
104 ASSERT_MGD_MTX(ifmgd);
105
106 if (!timer_pending(&ifmgd->timer) ||
107 time_before(timeout, ifmgd->timer.expires))
108 mod_timer(&ifmgd->timer, timeout);
109 }
110
111 static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata)
112 {
113 if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
114 return;
115
116 mod_timer(&sdata->u.mgd.bcn_mon_timer,
117 round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME));
118 }
119
120 static int ecw2cw(int ecw)
121 {
122 return (1 << ecw) - 1;
123 }
124
125 /*
126 * ieee80211_enable_ht should be called only after the operating band
127 * has been determined as ht configuration depends on the hw's
128 * HT abilities for a specific band.
129 */
130 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
131 struct ieee80211_ht_info *hti,
132 const u8 *bssid, u16 ap_ht_cap_flags)
133 {
134 struct ieee80211_local *local = sdata->local;
135 struct ieee80211_supported_band *sband;
136 struct sta_info *sta;
137 u32 changed = 0;
138 u16 ht_opmode;
139 bool enable_ht = true, ht_changed;
140 enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
141
142 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
143
144 /* HT is not supported */
145 if (!sband->ht_cap.ht_supported)
146 enable_ht = false;
147
148 /* check that channel matches the right operating channel */
149 if (local->hw.conf.channel->center_freq !=
150 ieee80211_channel_to_frequency(hti->control_chan))
151 enable_ht = false;
152
153 if (enable_ht) {
154 channel_type = NL80211_CHAN_HT20;
155
156 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
157 (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
158 (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
159 switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
160 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
161 if (!(local->hw.conf.channel->flags &
162 IEEE80211_CHAN_NO_HT40PLUS))
163 channel_type = NL80211_CHAN_HT40PLUS;
164 break;
165 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
166 if (!(local->hw.conf.channel->flags &
167 IEEE80211_CHAN_NO_HT40MINUS))
168 channel_type = NL80211_CHAN_HT40MINUS;
169 break;
170 }
171 }
172 }
173
174 ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
175 channel_type != local->hw.conf.channel_type;
176
177 local->oper_channel_type = channel_type;
178
179 if (ht_changed) {
180 /* channel_type change automatically detected */
181 ieee80211_hw_config(local, 0);
182
183 rcu_read_lock();
184 sta = sta_info_get(sdata, bssid);
185 if (sta)
186 rate_control_rate_update(local, sband, sta,
187 IEEE80211_RC_HT_CHANGED,
188 local->oper_channel_type);
189 rcu_read_unlock();
190 }
191
192 /* disable HT */
193 if (!enable_ht)
194 return 0;
195
196 ht_opmode = le16_to_cpu(hti->operation_mode);
197
198 /* if bss configuration changed store the new one */
199 if (!sdata->ht_opmode_valid ||
200 sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
201 changed |= BSS_CHANGED_HT;
202 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
203 sdata->ht_opmode_valid = true;
204 }
205
206 return changed;
207 }
208
209 /* frame sending functions */
210
211 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
212 const u8 *bssid, u16 stype, u16 reason,
213 void *cookie, bool send_frame)
214 {
215 struct ieee80211_local *local = sdata->local;
216 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
217 struct sk_buff *skb;
218 struct ieee80211_mgmt *mgmt;
219
220 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
221 if (!skb) {
222 printk(KERN_DEBUG "%s: failed to allocate buffer for "
223 "deauth/disassoc frame\n", sdata->name);
224 return;
225 }
226 skb_reserve(skb, local->hw.extra_tx_headroom);
227
228 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
229 memset(mgmt, 0, 24);
230 memcpy(mgmt->da, bssid, ETH_ALEN);
231 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
232 memcpy(mgmt->bssid, bssid, ETH_ALEN);
233 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
234 skb_put(skb, 2);
235 /* u.deauth.reason_code == u.disassoc.reason_code */
236 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
237
238 if (stype == IEEE80211_STYPE_DEAUTH)
239 if (cookie)
240 __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
241 else
242 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
243 else
244 if (cookie)
245 __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
246 else
247 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
248 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
249 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
250
251 if (send_frame)
252 ieee80211_tx_skb(sdata, skb);
253 else
254 kfree_skb(skb);
255 }
256
257 void ieee80211_send_pspoll(struct ieee80211_local *local,
258 struct ieee80211_sub_if_data *sdata)
259 {
260 struct ieee80211_pspoll *pspoll;
261 struct sk_buff *skb;
262
263 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
264 if (!skb)
265 return;
266
267 pspoll = (struct ieee80211_pspoll *) skb->data;
268 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
269
270 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
271 ieee80211_tx_skb(sdata, skb);
272 }
273
274 void ieee80211_send_nullfunc(struct ieee80211_local *local,
275 struct ieee80211_sub_if_data *sdata,
276 int powersave)
277 {
278 struct sk_buff *skb;
279 struct ieee80211_hdr_3addr *nullfunc;
280
281 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
282 if (!skb)
283 return;
284
285 nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
286 if (powersave)
287 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
288
289 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
290 ieee80211_tx_skb(sdata, skb);
291 }
292
293 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
294 struct ieee80211_sub_if_data *sdata)
295 {
296 struct sk_buff *skb;
297 struct ieee80211_hdr *nullfunc;
298 __le16 fc;
299
300 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
301 return;
302
303 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
304 if (!skb) {
305 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
306 "nullfunc frame\n", sdata->name);
307 return;
308 }
309 skb_reserve(skb, local->hw.extra_tx_headroom);
310
311 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
312 memset(nullfunc, 0, 30);
313 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
314 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
315 nullfunc->frame_control = fc;
316 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
317 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
318 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
319 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
320
321 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
322 ieee80211_tx_skb(sdata, skb);
323 }
324
325 /* spectrum management related things */
326 static void ieee80211_chswitch_work(struct work_struct *work)
327 {
328 struct ieee80211_sub_if_data *sdata =
329 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
330 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
331
332 if (!ieee80211_sdata_running(sdata))
333 return;
334
335 mutex_lock(&ifmgd->mtx);
336 if (!ifmgd->associated)
337 goto out;
338
339 sdata->local->oper_channel = sdata->local->csa_channel;
340 ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL);
341
342 /* XXX: shouldn't really modify cfg80211-owned data! */
343 ifmgd->associated->channel = sdata->local->oper_channel;
344
345 ieee80211_wake_queues_by_reason(&sdata->local->hw,
346 IEEE80211_QUEUE_STOP_REASON_CSA);
347 out:
348 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
349 mutex_unlock(&ifmgd->mtx);
350 }
351
352 static void ieee80211_chswitch_timer(unsigned long data)
353 {
354 struct ieee80211_sub_if_data *sdata =
355 (struct ieee80211_sub_if_data *) data;
356 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
357
358 if (sdata->local->quiescing) {
359 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
360 return;
361 }
362
363 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
364 }
365
366 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
367 struct ieee80211_channel_sw_ie *sw_elem,
368 struct ieee80211_bss *bss)
369 {
370 struct cfg80211_bss *cbss =
371 container_of((void *)bss, struct cfg80211_bss, priv);
372 struct ieee80211_channel *new_ch;
373 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
374 int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
375
376 ASSERT_MGD_MTX(ifmgd);
377
378 if (!ifmgd->associated)
379 return;
380
381 if (sdata->local->scanning)
382 return;
383
384 /* Disregard subsequent beacons if we are already running a timer
385 processing a CSA */
386
387 if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
388 return;
389
390 new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
391 if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
392 return;
393
394 sdata->local->csa_channel = new_ch;
395
396 if (sw_elem->count <= 1) {
397 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
398 } else {
399 ieee80211_stop_queues_by_reason(&sdata->local->hw,
400 IEEE80211_QUEUE_STOP_REASON_CSA);
401 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
402 mod_timer(&ifmgd->chswitch_timer,
403 jiffies +
404 msecs_to_jiffies(sw_elem->count *
405 cbss->beacon_interval));
406 }
407 }
408
409 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
410 u16 capab_info, u8 *pwr_constr_elem,
411 u8 pwr_constr_elem_len)
412 {
413 struct ieee80211_conf *conf = &sdata->local->hw.conf;
414
415 if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
416 return;
417
418 /* Power constraint IE length should be 1 octet */
419 if (pwr_constr_elem_len != 1)
420 return;
421
422 if ((*pwr_constr_elem <= conf->channel->max_power) &&
423 (*pwr_constr_elem != sdata->local->power_constr_level)) {
424 sdata->local->power_constr_level = *pwr_constr_elem;
425 ieee80211_hw_config(sdata->local, 0);
426 }
427 }
428
429 /* powersave */
430 static void ieee80211_enable_ps(struct ieee80211_local *local,
431 struct ieee80211_sub_if_data *sdata)
432 {
433 struct ieee80211_conf *conf = &local->hw.conf;
434
435 /*
436 * If we are scanning right now then the parameters will
437 * take effect when scan finishes.
438 */
439 if (local->scanning)
440 return;
441
442 if (conf->dynamic_ps_timeout > 0 &&
443 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
444 mod_timer(&local->dynamic_ps_timer, jiffies +
445 msecs_to_jiffies(conf->dynamic_ps_timeout));
446 } else {
447 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
448 ieee80211_send_nullfunc(local, sdata, 1);
449
450 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
451 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
452 return;
453
454 conf->flags |= IEEE80211_CONF_PS;
455 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
456 }
457 }
458
459 static void ieee80211_change_ps(struct ieee80211_local *local)
460 {
461 struct ieee80211_conf *conf = &local->hw.conf;
462
463 if (local->ps_sdata) {
464 ieee80211_enable_ps(local, local->ps_sdata);
465 } else if (conf->flags & IEEE80211_CONF_PS) {
466 conf->flags &= ~IEEE80211_CONF_PS;
467 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
468 del_timer_sync(&local->dynamic_ps_timer);
469 cancel_work_sync(&local->dynamic_ps_enable_work);
470 }
471 }
472
473 /* need to hold RTNL or interface lock */
474 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
475 {
476 struct ieee80211_sub_if_data *sdata, *found = NULL;
477 int count = 0;
478
479 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
480 local->ps_sdata = NULL;
481 return;
482 }
483
484 if (!list_empty(&local->work_list)) {
485 local->ps_sdata = NULL;
486 goto change;
487 }
488
489 list_for_each_entry(sdata, &local->interfaces, list) {
490 if (!ieee80211_sdata_running(sdata))
491 continue;
492 if (sdata->vif.type != NL80211_IFTYPE_STATION)
493 continue;
494 found = sdata;
495 count++;
496 }
497
498 if (count == 1 && found->u.mgd.powersave &&
499 found->u.mgd.associated &&
500 found->u.mgd.associated->beacon_ies &&
501 !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
502 IEEE80211_STA_CONNECTION_POLL))) {
503 s32 beaconint_us;
504
505 if (latency < 0)
506 latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
507
508 beaconint_us = ieee80211_tu_to_usec(
509 found->vif.bss_conf.beacon_int);
510
511 if (beaconint_us > latency) {
512 local->ps_sdata = NULL;
513 } else {
514 struct ieee80211_bss *bss;
515 int maxslp = 1;
516 u8 dtimper;
517
518 bss = (void *)found->u.mgd.associated->priv;
519 dtimper = bss->dtim_period;
520
521 /* If the TIM IE is invalid, pretend the value is 1 */
522 if (!dtimper)
523 dtimper = 1;
524 else if (dtimper > 1)
525 maxslp = min_t(int, dtimper,
526 latency / beaconint_us);
527
528 local->hw.conf.max_sleep_period = maxslp;
529 local->hw.conf.ps_dtim_period = dtimper;
530 local->ps_sdata = found;
531 }
532 } else {
533 local->ps_sdata = NULL;
534 }
535
536 change:
537 ieee80211_change_ps(local);
538 }
539
540 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
541 {
542 struct ieee80211_local *local =
543 container_of(work, struct ieee80211_local,
544 dynamic_ps_disable_work);
545
546 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
547 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
548 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
549 }
550
551 ieee80211_wake_queues_by_reason(&local->hw,
552 IEEE80211_QUEUE_STOP_REASON_PS);
553 }
554
555 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
556 {
557 struct ieee80211_local *local =
558 container_of(work, struct ieee80211_local,
559 dynamic_ps_enable_work);
560 struct ieee80211_sub_if_data *sdata = local->ps_sdata;
561 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
562
563 /* can only happen when PS was just disabled anyway */
564 if (!sdata)
565 return;
566
567 if (local->hw.conf.flags & IEEE80211_CONF_PS)
568 return;
569
570 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
571 (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
572 ieee80211_send_nullfunc(local, sdata, 1);
573
574 if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
575 (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
576 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
577 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
578 local->hw.conf.flags |= IEEE80211_CONF_PS;
579 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
580 }
581 }
582
583 void ieee80211_dynamic_ps_timer(unsigned long data)
584 {
585 struct ieee80211_local *local = (void *) data;
586
587 if (local->quiescing || local->suspended)
588 return;
589
590 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
591 }
592
593 /* MLME */
594 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
595 struct ieee80211_if_managed *ifmgd,
596 u8 *wmm_param, size_t wmm_param_len)
597 {
598 struct ieee80211_tx_queue_params params;
599 size_t left;
600 int count;
601 u8 *pos, uapsd_queues = 0;
602
603 if (!local->ops->conf_tx)
604 return;
605
606 if (local->hw.queues < 4)
607 return;
608
609 if (!wmm_param)
610 return;
611
612 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
613 return;
614
615 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
616 uapsd_queues = local->uapsd_queues;
617
618 count = wmm_param[6] & 0x0f;
619 if (count == ifmgd->wmm_last_param_set)
620 return;
621 ifmgd->wmm_last_param_set = count;
622
623 pos = wmm_param + 8;
624 left = wmm_param_len - 8;
625
626 memset(&params, 0, sizeof(params));
627
628 local->wmm_acm = 0;
629 for (; left >= 4; left -= 4, pos += 4) {
630 int aci = (pos[0] >> 5) & 0x03;
631 int acm = (pos[0] >> 4) & 0x01;
632 bool uapsd = false;
633 int queue;
634
635 switch (aci) {
636 case 1: /* AC_BK */
637 queue = 3;
638 if (acm)
639 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
640 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
641 uapsd = true;
642 break;
643 case 2: /* AC_VI */
644 queue = 1;
645 if (acm)
646 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
647 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
648 uapsd = true;
649 break;
650 case 3: /* AC_VO */
651 queue = 0;
652 if (acm)
653 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
654 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
655 uapsd = true;
656 break;
657 case 0: /* AC_BE */
658 default:
659 queue = 2;
660 if (acm)
661 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
662 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
663 uapsd = true;
664 break;
665 }
666
667 params.aifs = pos[0] & 0x0f;
668 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
669 params.cw_min = ecw2cw(pos[1] & 0x0f);
670 params.txop = get_unaligned_le16(pos + 2);
671 params.uapsd = uapsd;
672
673 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
674 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
675 "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
676 wiphy_name(local->hw.wiphy), queue, aci, acm,
677 params.aifs, params.cw_min, params.cw_max, params.txop,
678 params.uapsd);
679 #endif
680 if (drv_conf_tx(local, queue, &params))
681 printk(KERN_DEBUG "%s: failed to set TX queue "
682 "parameters for queue %d\n",
683 wiphy_name(local->hw.wiphy), queue);
684 }
685
686 /* enable WMM or activate new settings */
687 local->hw.conf.flags |= IEEE80211_CONF_QOS;
688 drv_config(local, IEEE80211_CONF_CHANGE_QOS);
689 }
690
691 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
692 u16 capab, bool erp_valid, u8 erp)
693 {
694 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
695 u32 changed = 0;
696 bool use_protection;
697 bool use_short_preamble;
698 bool use_short_slot;
699
700 if (erp_valid) {
701 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
702 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
703 } else {
704 use_protection = false;
705 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
706 }
707
708 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
709 if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
710 use_short_slot = true;
711
712 if (use_protection != bss_conf->use_cts_prot) {
713 bss_conf->use_cts_prot = use_protection;
714 changed |= BSS_CHANGED_ERP_CTS_PROT;
715 }
716
717 if (use_short_preamble != bss_conf->use_short_preamble) {
718 bss_conf->use_short_preamble = use_short_preamble;
719 changed |= BSS_CHANGED_ERP_PREAMBLE;
720 }
721
722 if (use_short_slot != bss_conf->use_short_slot) {
723 bss_conf->use_short_slot = use_short_slot;
724 changed |= BSS_CHANGED_ERP_SLOT;
725 }
726
727 return changed;
728 }
729
730 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
731 struct cfg80211_bss *cbss,
732 u32 bss_info_changed)
733 {
734 struct ieee80211_bss *bss = (void *)cbss->priv;
735 struct ieee80211_local *local = sdata->local;
736
737 bss_info_changed |= BSS_CHANGED_ASSOC;
738 /* set timing information */
739 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
740 sdata->vif.bss_conf.timestamp = cbss->tsf;
741
742 bss_info_changed |= BSS_CHANGED_BEACON_INT;
743 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
744 cbss->capability, bss->has_erp_value, bss->erp_value);
745
746 sdata->u.mgd.associated = cbss;
747 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
748
749 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
750
751 /* just to be sure */
752 sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
753 IEEE80211_STA_BEACON_POLL);
754
755 /*
756 * Always handle WMM once after association regardless
757 * of the first value the AP uses. Setting -1 here has
758 * that effect because the AP values is an unsigned
759 * 4-bit value.
760 */
761 sdata->u.mgd.wmm_last_param_set = -1;
762
763 ieee80211_led_assoc(local, 1);
764
765 sdata->vif.bss_conf.assoc = 1;
766 /*
767 * For now just always ask the driver to update the basic rateset
768 * when we have associated, we aren't checking whether it actually
769 * changed or not.
770 */
771 bss_info_changed |= BSS_CHANGED_BASIC_RATES;
772
773 /* And the BSSID changed - we're associated now */
774 bss_info_changed |= BSS_CHANGED_BSSID;
775
776 /* Tell the driver to monitor connection quality (if supported) */
777 if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
778 sdata->vif.bss_conf.cqm_rssi_thold)
779 bss_info_changed |= BSS_CHANGED_CQM;
780
781 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
782
783 mutex_lock(&local->iflist_mtx);
784 ieee80211_recalc_ps(local, -1);
785 ieee80211_recalc_smps(local, sdata);
786 mutex_unlock(&local->iflist_mtx);
787
788 netif_tx_start_all_queues(sdata->dev);
789 netif_carrier_on(sdata->dev);
790 }
791
792 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
793 bool remove_sta)
794 {
795 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
796 struct ieee80211_local *local = sdata->local;
797 struct sta_info *sta;
798 u32 changed = 0, config_changed = 0;
799 u8 bssid[ETH_ALEN];
800
801 ASSERT_MGD_MTX(ifmgd);
802
803 if (WARN_ON(!ifmgd->associated))
804 return;
805
806 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
807
808 ifmgd->associated = NULL;
809 memset(ifmgd->bssid, 0, ETH_ALEN);
810
811 /*
812 * we need to commit the associated = NULL change because the
813 * scan code uses that to determine whether this iface should
814 * go to/wake up from powersave or not -- and could otherwise
815 * wake the queues erroneously.
816 */
817 smp_mb();
818
819 /*
820 * Thus, we can only afterwards stop the queues -- to account
821 * for the case where another CPU is finishing a scan at this
822 * time -- we don't want the scan code to enable queues.
823 */
824
825 netif_tx_stop_all_queues(sdata->dev);
826 netif_carrier_off(sdata->dev);
827
828 rcu_read_lock();
829 sta = sta_info_get(sdata, bssid);
830 if (sta) {
831 set_sta_flags(sta, WLAN_STA_DISASSOC);
832 ieee80211_sta_tear_down_BA_sessions(sta);
833 }
834 rcu_read_unlock();
835
836 changed |= ieee80211_reset_erp_info(sdata);
837
838 ieee80211_led_assoc(local, 0);
839 changed |= BSS_CHANGED_ASSOC;
840 sdata->vif.bss_conf.assoc = false;
841
842 ieee80211_set_wmm_default(sdata);
843
844 /* channel(_type) changes are handled by ieee80211_hw_config */
845 local->oper_channel_type = NL80211_CHAN_NO_HT;
846
847 /* on the next assoc, re-program HT parameters */
848 sdata->ht_opmode_valid = false;
849
850 local->power_constr_level = 0;
851
852 del_timer_sync(&local->dynamic_ps_timer);
853 cancel_work_sync(&local->dynamic_ps_enable_work);
854
855 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
856 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
857 config_changed |= IEEE80211_CONF_CHANGE_PS;
858 }
859
860 ieee80211_hw_config(local, config_changed);
861
862 /* And the BSSID changed -- not very interesting here */
863 changed |= BSS_CHANGED_BSSID;
864 ieee80211_bss_info_change_notify(sdata, changed);
865
866 if (remove_sta)
867 sta_info_destroy_addr(sdata, bssid);
868 }
869
870 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
871 struct ieee80211_hdr *hdr)
872 {
873 /*
874 * We can postpone the mgd.timer whenever receiving unicast frames
875 * from AP because we know that the connection is working both ways
876 * at that time. But multicast frames (and hence also beacons) must
877 * be ignored here, because we need to trigger the timer during
878 * data idle periods for sending the periodic probe request to the
879 * AP we're connected to.
880 */
881 if (is_multicast_ether_addr(hdr->addr1))
882 return;
883
884 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
885 return;
886
887 mod_timer(&sdata->u.mgd.conn_mon_timer,
888 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
889 }
890
891 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
892 {
893 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
894 const u8 *ssid;
895
896 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
897 ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
898 ssid + 2, ssid[1], NULL, 0);
899
900 ifmgd->probe_send_count++;
901 ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
902 run_again(ifmgd, ifmgd->probe_timeout);
903 }
904
905 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
906 bool beacon)
907 {
908 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
909 bool already = false;
910
911 if (!ieee80211_sdata_running(sdata))
912 return;
913
914 if (sdata->local->scanning)
915 return;
916
917 if (sdata->local->tmp_channel)
918 return;
919
920 mutex_lock(&ifmgd->mtx);
921
922 if (!ifmgd->associated)
923 goto out;
924
925 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
926 if (beacon && net_ratelimit())
927 printk(KERN_DEBUG "%s: detected beacon loss from AP "
928 "- sending probe request\n", sdata->name);
929 #endif
930
931 /*
932 * The driver/our work has already reported this event or the
933 * connection monitoring has kicked in and we have already sent
934 * a probe request. Or maybe the AP died and the driver keeps
935 * reporting until we disassociate...
936 *
937 * In either case we have to ignore the current call to this
938 * function (except for setting the correct probe reason bit)
939 * because otherwise we would reset the timer every time and
940 * never check whether we received a probe response!
941 */
942 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
943 IEEE80211_STA_CONNECTION_POLL))
944 already = true;
945
946 if (beacon)
947 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
948 else
949 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
950
951 if (already)
952 goto out;
953
954 mutex_lock(&sdata->local->iflist_mtx);
955 ieee80211_recalc_ps(sdata->local, -1);
956 mutex_unlock(&sdata->local->iflist_mtx);
957
958 ifmgd->probe_send_count = 0;
959 ieee80211_mgd_probe_ap_send(sdata);
960 out:
961 mutex_unlock(&ifmgd->mtx);
962 }
963
964 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
965 {
966 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
967 struct ieee80211_local *local = sdata->local;
968 u8 bssid[ETH_ALEN];
969
970 mutex_lock(&ifmgd->mtx);
971 if (!ifmgd->associated) {
972 mutex_unlock(&ifmgd->mtx);
973 return;
974 }
975
976 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
977
978 printk(KERN_DEBUG "Connection to AP %pM lost.\n", bssid);
979
980 ieee80211_set_disassoc(sdata, true);
981 ieee80211_recalc_idle(local);
982 mutex_unlock(&ifmgd->mtx);
983 /*
984 * must be outside lock due to cfg80211,
985 * but that's not a problem.
986 */
987 ieee80211_send_deauth_disassoc(sdata, bssid,
988 IEEE80211_STYPE_DEAUTH,
989 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
990 NULL, true);
991 }
992
993 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
994 {
995 struct ieee80211_sub_if_data *sdata =
996 container_of(work, struct ieee80211_sub_if_data,
997 u.mgd.beacon_connection_loss_work);
998
999 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1000 __ieee80211_connection_loss(sdata);
1001 else
1002 ieee80211_mgd_probe_ap(sdata, true);
1003 }
1004
1005 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1006 {
1007 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1008 struct ieee80211_hw *hw = &sdata->local->hw;
1009
1010 WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1011 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1012 }
1013 EXPORT_SYMBOL(ieee80211_beacon_loss);
1014
1015 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1016 {
1017 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1018 struct ieee80211_hw *hw = &sdata->local->hw;
1019
1020 WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1021 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1022 }
1023 EXPORT_SYMBOL(ieee80211_connection_loss);
1024
1025
1026 static enum rx_mgmt_action __must_check
1027 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1028 struct ieee80211_mgmt *mgmt, size_t len)
1029 {
1030 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1031 const u8 *bssid = NULL;
1032 u16 reason_code;
1033
1034 if (len < 24 + 2)
1035 return RX_MGMT_NONE;
1036
1037 ASSERT_MGD_MTX(ifmgd);
1038
1039 bssid = ifmgd->associated->bssid;
1040
1041 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1042
1043 printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1044 sdata->name, bssid, reason_code);
1045
1046 ieee80211_set_disassoc(sdata, true);
1047 ieee80211_recalc_idle(sdata->local);
1048
1049 return RX_MGMT_CFG80211_DEAUTH;
1050 }
1051
1052
1053 static enum rx_mgmt_action __must_check
1054 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1055 struct ieee80211_mgmt *mgmt, size_t len)
1056 {
1057 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1058 u16 reason_code;
1059
1060 if (len < 24 + 2)
1061 return RX_MGMT_NONE;
1062
1063 ASSERT_MGD_MTX(ifmgd);
1064
1065 if (WARN_ON(!ifmgd->associated))
1066 return RX_MGMT_NONE;
1067
1068 if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1069 return RX_MGMT_NONE;
1070
1071 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1072
1073 printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1074 sdata->name, mgmt->sa, reason_code);
1075
1076 ieee80211_set_disassoc(sdata, true);
1077 ieee80211_recalc_idle(sdata->local);
1078 return RX_MGMT_CFG80211_DISASSOC;
1079 }
1080
1081
1082 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1083 struct ieee80211_mgmt *mgmt, size_t len)
1084 {
1085 struct ieee80211_sub_if_data *sdata = wk->sdata;
1086 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1087 struct ieee80211_local *local = sdata->local;
1088 struct ieee80211_supported_band *sband;
1089 struct sta_info *sta;
1090 struct cfg80211_bss *cbss = wk->assoc.bss;
1091 u8 *pos;
1092 u32 rates, basic_rates;
1093 u16 capab_info, aid;
1094 struct ieee802_11_elems elems;
1095 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1096 u32 changed = 0;
1097 int i, j, err;
1098 bool have_higher_than_11mbit = false;
1099 u16 ap_ht_cap_flags;
1100
1101 /* AssocResp and ReassocResp have identical structure */
1102
1103 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1104 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1105
1106 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1107 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1108 "set\n", sdata->name, aid);
1109 aid &= ~(BIT(15) | BIT(14));
1110
1111 pos = mgmt->u.assoc_resp.variable;
1112 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1113
1114 if (!elems.supp_rates) {
1115 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1116 sdata->name);
1117 return false;
1118 }
1119
1120 ifmgd->aid = aid;
1121
1122 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1123 if (!sta) {
1124 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1125 " the AP\n", sdata->name);
1126 return false;
1127 }
1128
1129 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1130 WLAN_STA_ASSOC_AP);
1131 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1132 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1133
1134 rates = 0;
1135 basic_rates = 0;
1136 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1137
1138 for (i = 0; i < elems.supp_rates_len; i++) {
1139 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1140 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1141
1142 if (rate > 110)
1143 have_higher_than_11mbit = true;
1144
1145 for (j = 0; j < sband->n_bitrates; j++) {
1146 if (sband->bitrates[j].bitrate == rate) {
1147 rates |= BIT(j);
1148 if (is_basic)
1149 basic_rates |= BIT(j);
1150 break;
1151 }
1152 }
1153 }
1154
1155 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1156 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1157 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1158
1159 if (rate > 110)
1160 have_higher_than_11mbit = true;
1161
1162 for (j = 0; j < sband->n_bitrates; j++) {
1163 if (sband->bitrates[j].bitrate == rate) {
1164 rates |= BIT(j);
1165 if (is_basic)
1166 basic_rates |= BIT(j);
1167 break;
1168 }
1169 }
1170 }
1171
1172 sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1173 sdata->vif.bss_conf.basic_rates = basic_rates;
1174
1175 /* cf. IEEE 802.11 9.2.12 */
1176 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1177 have_higher_than_11mbit)
1178 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1179 else
1180 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1181
1182 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1183 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1184 elems.ht_cap_elem, &sta->sta.ht_cap);
1185
1186 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1187
1188 rate_control_rate_init(sta);
1189
1190 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1191 set_sta_flags(sta, WLAN_STA_MFP);
1192
1193 if (elems.wmm_param)
1194 set_sta_flags(sta, WLAN_STA_WME);
1195
1196 err = sta_info_insert(sta);
1197 sta = NULL;
1198 if (err) {
1199 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1200 " the AP (error %d)\n", sdata->name, err);
1201 return false;
1202 }
1203
1204 if (elems.wmm_param)
1205 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1206 elems.wmm_param_len);
1207 else
1208 ieee80211_set_wmm_default(sdata);
1209
1210 local->oper_channel = wk->chan;
1211
1212 if (elems.ht_info_elem && elems.wmm_param &&
1213 (sdata->local->hw.queues >= 4) &&
1214 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1215 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1216 cbss->bssid, ap_ht_cap_flags);
1217
1218 /* set AID and assoc capability,
1219 * ieee80211_set_associated() will tell the driver */
1220 bss_conf->aid = aid;
1221 bss_conf->assoc_capability = capab_info;
1222 ieee80211_set_associated(sdata, cbss, changed);
1223
1224 /*
1225 * If we're using 4-addr mode, let the AP know that we're
1226 * doing so, so that it can create the STA VLAN on its side
1227 */
1228 if (ifmgd->use_4addr)
1229 ieee80211_send_4addr_nullfunc(local, sdata);
1230
1231 /*
1232 * Start timer to probe the connection to the AP now.
1233 * Also start the timer that will detect beacon loss.
1234 */
1235 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1236 mod_beacon_timer(sdata);
1237
1238 return true;
1239 }
1240
1241
1242 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1243 struct ieee80211_mgmt *mgmt,
1244 size_t len,
1245 struct ieee80211_rx_status *rx_status,
1246 struct ieee802_11_elems *elems,
1247 bool beacon)
1248 {
1249 struct ieee80211_local *local = sdata->local;
1250 int freq;
1251 struct ieee80211_bss *bss;
1252 struct ieee80211_channel *channel;
1253 bool need_ps = false;
1254
1255 if (sdata->u.mgd.associated) {
1256 bss = (void *)sdata->u.mgd.associated->priv;
1257 /* not previously set so we may need to recalc */
1258 need_ps = !bss->dtim_period;
1259 }
1260
1261 if (elems->ds_params && elems->ds_params_len == 1)
1262 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1263 else
1264 freq = rx_status->freq;
1265
1266 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1267
1268 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1269 return;
1270
1271 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1272 channel, beacon);
1273 if (bss)
1274 ieee80211_rx_bss_put(local, bss);
1275
1276 if (!sdata->u.mgd.associated)
1277 return;
1278
1279 if (need_ps) {
1280 mutex_lock(&local->iflist_mtx);
1281 ieee80211_recalc_ps(local, -1);
1282 mutex_unlock(&local->iflist_mtx);
1283 }
1284
1285 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1286 (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1287 ETH_ALEN) == 0)) {
1288 struct ieee80211_channel_sw_ie *sw_elem =
1289 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1290 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1291 }
1292 }
1293
1294
1295 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1296 struct sk_buff *skb)
1297 {
1298 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1299 struct ieee80211_if_managed *ifmgd;
1300 struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1301 size_t baselen, len = skb->len;
1302 struct ieee802_11_elems elems;
1303
1304 ifmgd = &sdata->u.mgd;
1305
1306 ASSERT_MGD_MTX(ifmgd);
1307
1308 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1309 return; /* ignore ProbeResp to foreign address */
1310
1311 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1312 if (baselen > len)
1313 return;
1314
1315 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1316 &elems);
1317
1318 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1319
1320 if (ifmgd->associated &&
1321 memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1322 ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1323 IEEE80211_STA_CONNECTION_POLL)) {
1324 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1325 IEEE80211_STA_BEACON_POLL);
1326 mutex_lock(&sdata->local->iflist_mtx);
1327 ieee80211_recalc_ps(sdata->local, -1);
1328 mutex_unlock(&sdata->local->iflist_mtx);
1329 /*
1330 * We've received a probe response, but are not sure whether
1331 * we have or will be receiving any beacons or data, so let's
1332 * schedule the timers again, just in case.
1333 */
1334 mod_beacon_timer(sdata);
1335 mod_timer(&ifmgd->conn_mon_timer,
1336 round_jiffies_up(jiffies +
1337 IEEE80211_CONNECTION_IDLE_TIME));
1338 }
1339 }
1340
1341 /*
1342 * This is the canonical list of information elements we care about,
1343 * the filter code also gives us all changes to the Microsoft OUI
1344 * (00:50:F2) vendor IE which is used for WMM which we need to track.
1345 *
1346 * We implement beacon filtering in software since that means we can
1347 * avoid processing the frame here and in cfg80211, and userspace
1348 * will not be able to tell whether the hardware supports it or not.
1349 *
1350 * XXX: This list needs to be dynamic -- userspace needs to be able to
1351 * add items it requires. It also needs to be able to tell us to
1352 * look out for other vendor IEs.
1353 */
1354 static const u64 care_about_ies =
1355 (1ULL << WLAN_EID_COUNTRY) |
1356 (1ULL << WLAN_EID_ERP_INFO) |
1357 (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1358 (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1359 (1ULL << WLAN_EID_HT_CAPABILITY) |
1360 (1ULL << WLAN_EID_HT_INFORMATION);
1361
1362 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1363 struct ieee80211_mgmt *mgmt,
1364 size_t len,
1365 struct ieee80211_rx_status *rx_status)
1366 {
1367 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1368 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1369 size_t baselen;
1370 struct ieee802_11_elems elems;
1371 struct ieee80211_local *local = sdata->local;
1372 u32 changed = 0;
1373 bool erp_valid, directed_tim = false;
1374 u8 erp_value = 0;
1375 u32 ncrc;
1376 u8 *bssid;
1377
1378 ASSERT_MGD_MTX(ifmgd);
1379
1380 /* Process beacon from the current BSS */
1381 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1382 if (baselen > len)
1383 return;
1384
1385 if (rx_status->freq != local->hw.conf.channel->center_freq)
1386 return;
1387
1388 /*
1389 * We might have received a number of frames, among them a
1390 * disassoc frame and a beacon...
1391 */
1392 if (!ifmgd->associated)
1393 return;
1394
1395 bssid = ifmgd->associated->bssid;
1396
1397 /*
1398 * And in theory even frames from a different AP we were just
1399 * associated to a split-second ago!
1400 */
1401 if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1402 return;
1403
1404 /* Track average RSSI from the Beacon frames of the current AP */
1405 ifmgd->last_beacon_signal = rx_status->signal;
1406 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1407 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1408 ifmgd->ave_beacon_signal = rx_status->signal;
1409 ifmgd->last_cqm_event_signal = 0;
1410 } else {
1411 ifmgd->ave_beacon_signal =
1412 (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1413 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1414 ifmgd->ave_beacon_signal) / 16;
1415 }
1416 if (bss_conf->cqm_rssi_thold &&
1417 !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1418 int sig = ifmgd->ave_beacon_signal / 16;
1419 int last_event = ifmgd->last_cqm_event_signal;
1420 int thold = bss_conf->cqm_rssi_thold;
1421 int hyst = bss_conf->cqm_rssi_hyst;
1422 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_LOW,
1428 GFP_KERNEL);
1429 } else 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_HIGH,
1435 GFP_KERNEL);
1436 }
1437 }
1438
1439 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1440 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1441 if (net_ratelimit()) {
1442 printk(KERN_DEBUG "%s: cancelling probereq poll due "
1443 "to a received beacon\n", sdata->name);
1444 }
1445 #endif
1446 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1447 mutex_lock(&local->iflist_mtx);
1448 ieee80211_recalc_ps(local, -1);
1449 mutex_unlock(&local->iflist_mtx);
1450 }
1451
1452 /*
1453 * Push the beacon loss detection into the future since
1454 * we are processing a beacon from the AP just now.
1455 */
1456 mod_beacon_timer(sdata);
1457
1458 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1459 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1460 len - baselen, &elems,
1461 care_about_ies, ncrc);
1462
1463 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1464 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1465 ifmgd->aid);
1466
1467 if (ncrc != ifmgd->beacon_crc) {
1468 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1469 true);
1470
1471 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1472 elems.wmm_param_len);
1473 }
1474
1475 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1476 if (directed_tim) {
1477 if (local->hw.conf.dynamic_ps_timeout > 0) {
1478 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1479 ieee80211_hw_config(local,
1480 IEEE80211_CONF_CHANGE_PS);
1481 ieee80211_send_nullfunc(local, sdata, 0);
1482 } else {
1483 local->pspolling = true;
1484
1485 /*
1486 * Here is assumed that the driver will be
1487 * able to send ps-poll frame and receive a
1488 * response even though power save mode is
1489 * enabled, but some drivers might require
1490 * to disable power save here. This needs
1491 * to be investigated.
1492 */
1493 ieee80211_send_pspoll(local, sdata);
1494 }
1495 }
1496 }
1497
1498 if (ncrc == ifmgd->beacon_crc)
1499 return;
1500 ifmgd->beacon_crc = ncrc;
1501
1502 if (elems.erp_info && elems.erp_info_len >= 1) {
1503 erp_valid = true;
1504 erp_value = elems.erp_info[0];
1505 } else {
1506 erp_valid = false;
1507 }
1508 changed |= ieee80211_handle_bss_capability(sdata,
1509 le16_to_cpu(mgmt->u.beacon.capab_info),
1510 erp_valid, erp_value);
1511
1512
1513 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1514 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1515 struct sta_info *sta;
1516 struct ieee80211_supported_band *sband;
1517 u16 ap_ht_cap_flags;
1518
1519 rcu_read_lock();
1520
1521 sta = sta_info_get(sdata, bssid);
1522 if (WARN_ON(!sta)) {
1523 rcu_read_unlock();
1524 return;
1525 }
1526
1527 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1528
1529 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1530 elems.ht_cap_elem, &sta->sta.ht_cap);
1531
1532 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1533
1534 rcu_read_unlock();
1535
1536 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1537 bssid, ap_ht_cap_flags);
1538 }
1539
1540 /* Note: country IE parsing is done for us by cfg80211 */
1541 if (elems.country_elem) {
1542 /* TODO: IBSS also needs this */
1543 if (elems.pwr_constr_elem)
1544 ieee80211_handle_pwr_constr(sdata,
1545 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1546 elems.pwr_constr_elem,
1547 elems.pwr_constr_elem_len);
1548 }
1549
1550 ieee80211_bss_info_change_notify(sdata, changed);
1551 }
1552
1553 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1554 struct sk_buff *skb)
1555 {
1556 struct ieee80211_local *local = sdata->local;
1557 struct ieee80211_mgmt *mgmt;
1558 u16 fc;
1559
1560 if (skb->len < 24)
1561 return RX_DROP_MONITOR;
1562
1563 mgmt = (struct ieee80211_mgmt *) skb->data;
1564 fc = le16_to_cpu(mgmt->frame_control);
1565
1566 switch (fc & IEEE80211_FCTL_STYPE) {
1567 case IEEE80211_STYPE_PROBE_RESP:
1568 case IEEE80211_STYPE_BEACON:
1569 case IEEE80211_STYPE_DEAUTH:
1570 case IEEE80211_STYPE_DISASSOC:
1571 case IEEE80211_STYPE_ACTION:
1572 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1573 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
1574 return RX_QUEUED;
1575 }
1576
1577 return RX_DROP_MONITOR;
1578 }
1579
1580 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1581 struct sk_buff *skb)
1582 {
1583 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1584 struct ieee80211_rx_status *rx_status;
1585 struct ieee80211_mgmt *mgmt;
1586 enum rx_mgmt_action rma = RX_MGMT_NONE;
1587 u16 fc;
1588
1589 rx_status = (struct ieee80211_rx_status *) skb->cb;
1590 mgmt = (struct ieee80211_mgmt *) skb->data;
1591 fc = le16_to_cpu(mgmt->frame_control);
1592
1593 mutex_lock(&ifmgd->mtx);
1594
1595 if (ifmgd->associated &&
1596 memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1597 switch (fc & IEEE80211_FCTL_STYPE) {
1598 case IEEE80211_STYPE_BEACON:
1599 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1600 rx_status);
1601 break;
1602 case IEEE80211_STYPE_PROBE_RESP:
1603 ieee80211_rx_mgmt_probe_resp(sdata, skb);
1604 break;
1605 case IEEE80211_STYPE_DEAUTH:
1606 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1607 break;
1608 case IEEE80211_STYPE_DISASSOC:
1609 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1610 break;
1611 case IEEE80211_STYPE_ACTION:
1612 if (mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
1613 break;
1614
1615 ieee80211_sta_process_chanswitch(sdata,
1616 &mgmt->u.action.u.chan_switch.sw_elem,
1617 (void *)ifmgd->associated->priv);
1618 break;
1619 }
1620 mutex_unlock(&ifmgd->mtx);
1621
1622 switch (rma) {
1623 case RX_MGMT_NONE:
1624 /* no action */
1625 break;
1626 case RX_MGMT_CFG80211_DEAUTH:
1627 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1628 break;
1629 case RX_MGMT_CFG80211_DISASSOC:
1630 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1631 break;
1632 default:
1633 WARN(1, "unexpected: %d", rma);
1634 }
1635 goto out;
1636 }
1637
1638 mutex_unlock(&ifmgd->mtx);
1639
1640 if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1641 (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH)
1642 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1643
1644 out:
1645 kfree_skb(skb);
1646 }
1647
1648 static void ieee80211_sta_timer(unsigned long data)
1649 {
1650 struct ieee80211_sub_if_data *sdata =
1651 (struct ieee80211_sub_if_data *) data;
1652 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1653 struct ieee80211_local *local = sdata->local;
1654
1655 if (local->quiescing) {
1656 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1657 return;
1658 }
1659
1660 ieee80211_queue_work(&local->hw, &ifmgd->work);
1661 }
1662
1663 static void ieee80211_sta_work(struct work_struct *work)
1664 {
1665 struct ieee80211_sub_if_data *sdata =
1666 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1667 struct ieee80211_local *local = sdata->local;
1668 struct ieee80211_if_managed *ifmgd;
1669 struct sk_buff *skb;
1670
1671 if (!ieee80211_sdata_running(sdata))
1672 return;
1673
1674 if (local->scanning)
1675 return;
1676
1677 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1678 return;
1679
1680 /*
1681 * ieee80211_queue_work() should have picked up most cases,
1682 * here we'll pick the the rest.
1683 */
1684 if (WARN(local->suspended, "STA MLME work scheduled while "
1685 "going to suspend\n"))
1686 return;
1687
1688 ifmgd = &sdata->u.mgd;
1689
1690 /* first process frames to avoid timing out while a frame is pending */
1691 while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1692 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1693
1694 /* then process the rest of the work */
1695 mutex_lock(&ifmgd->mtx);
1696
1697 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1698 IEEE80211_STA_CONNECTION_POLL) &&
1699 ifmgd->associated) {
1700 u8 bssid[ETH_ALEN];
1701
1702 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1703 if (time_is_after_jiffies(ifmgd->probe_timeout))
1704 run_again(ifmgd, ifmgd->probe_timeout);
1705
1706 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1707 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1708 printk(KERN_DEBUG "No probe response from AP %pM"
1709 " after %dms, try %d\n", bssid,
1710 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1711 ifmgd->probe_send_count);
1712 #endif
1713 ieee80211_mgd_probe_ap_send(sdata);
1714 } else {
1715 /*
1716 * We actually lost the connection ... or did we?
1717 * Let's make sure!
1718 */
1719 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1720 IEEE80211_STA_BEACON_POLL);
1721 printk(KERN_DEBUG "No probe response from AP %pM"
1722 " after %dms, disconnecting.\n",
1723 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1724 ieee80211_set_disassoc(sdata, true);
1725 ieee80211_recalc_idle(local);
1726 mutex_unlock(&ifmgd->mtx);
1727 /*
1728 * must be outside lock due to cfg80211,
1729 * but that's not a problem.
1730 */
1731 ieee80211_send_deauth_disassoc(sdata, bssid,
1732 IEEE80211_STYPE_DEAUTH,
1733 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1734 NULL, true);
1735 mutex_lock(&ifmgd->mtx);
1736 }
1737 }
1738
1739 mutex_unlock(&ifmgd->mtx);
1740 }
1741
1742 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1743 {
1744 struct ieee80211_sub_if_data *sdata =
1745 (struct ieee80211_sub_if_data *) data;
1746 struct ieee80211_local *local = sdata->local;
1747
1748 if (local->quiescing)
1749 return;
1750
1751 ieee80211_queue_work(&sdata->local->hw,
1752 &sdata->u.mgd.beacon_connection_loss_work);
1753 }
1754
1755 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1756 {
1757 struct ieee80211_sub_if_data *sdata =
1758 (struct ieee80211_sub_if_data *) data;
1759 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1760 struct ieee80211_local *local = sdata->local;
1761
1762 if (local->quiescing)
1763 return;
1764
1765 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1766 }
1767
1768 static void ieee80211_sta_monitor_work(struct work_struct *work)
1769 {
1770 struct ieee80211_sub_if_data *sdata =
1771 container_of(work, struct ieee80211_sub_if_data,
1772 u.mgd.monitor_work);
1773
1774 ieee80211_mgd_probe_ap(sdata, false);
1775 }
1776
1777 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1778 {
1779 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1780 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1781 IEEE80211_STA_CONNECTION_POLL);
1782
1783 /* let's probe the connection once */
1784 ieee80211_queue_work(&sdata->local->hw,
1785 &sdata->u.mgd.monitor_work);
1786 /* and do all the other regular work too */
1787 ieee80211_queue_work(&sdata->local->hw,
1788 &sdata->u.mgd.work);
1789 }
1790 }
1791
1792 #ifdef CONFIG_PM
1793 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1794 {
1795 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1796
1797 /*
1798 * we need to use atomic bitops for the running bits
1799 * only because both timers might fire at the same
1800 * time -- the code here is properly synchronised.
1801 */
1802
1803 cancel_work_sync(&ifmgd->work);
1804 cancel_work_sync(&ifmgd->beacon_connection_loss_work);
1805 if (del_timer_sync(&ifmgd->timer))
1806 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1807
1808 cancel_work_sync(&ifmgd->chswitch_work);
1809 if (del_timer_sync(&ifmgd->chswitch_timer))
1810 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1811
1812 cancel_work_sync(&ifmgd->monitor_work);
1813 /* these will just be re-established on connection */
1814 del_timer_sync(&ifmgd->conn_mon_timer);
1815 del_timer_sync(&ifmgd->bcn_mon_timer);
1816 }
1817
1818 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1819 {
1820 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1821
1822 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1823 add_timer(&ifmgd->timer);
1824 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1825 add_timer(&ifmgd->chswitch_timer);
1826 }
1827 #endif
1828
1829 /* interface setup */
1830 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1831 {
1832 struct ieee80211_if_managed *ifmgd;
1833
1834 ifmgd = &sdata->u.mgd;
1835 INIT_WORK(&ifmgd->work, ieee80211_sta_work);
1836 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1837 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1838 INIT_WORK(&ifmgd->beacon_connection_loss_work,
1839 ieee80211_beacon_connection_loss_work);
1840 setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1841 (unsigned long) sdata);
1842 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1843 (unsigned long) sdata);
1844 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1845 (unsigned long) sdata);
1846 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1847 (unsigned long) sdata);
1848 skb_queue_head_init(&ifmgd->skb_queue);
1849
1850 ifmgd->flags = 0;
1851
1852 mutex_init(&ifmgd->mtx);
1853
1854 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1855 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1856 else
1857 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1858 }
1859
1860 /* scan finished notification */
1861 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1862 {
1863 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1864
1865 /* Restart STA timers */
1866 rcu_read_lock();
1867 list_for_each_entry_rcu(sdata, &local->interfaces, list)
1868 ieee80211_restart_sta_timer(sdata);
1869 rcu_read_unlock();
1870 }
1871
1872 int ieee80211_max_network_latency(struct notifier_block *nb,
1873 unsigned long data, void *dummy)
1874 {
1875 s32 latency_usec = (s32) data;
1876 struct ieee80211_local *local =
1877 container_of(nb, struct ieee80211_local,
1878 network_latency_notifier);
1879
1880 mutex_lock(&local->iflist_mtx);
1881 ieee80211_recalc_ps(local, latency_usec);
1882 mutex_unlock(&local->iflist_mtx);
1883
1884 return 0;
1885 }
1886
1887 /* config hooks */
1888 static enum work_done_result
1889 ieee80211_probe_auth_done(struct ieee80211_work *wk,
1890 struct sk_buff *skb)
1891 {
1892 if (!skb) {
1893 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
1894 return WORK_DONE_DESTROY;
1895 }
1896
1897 if (wk->type == IEEE80211_WORK_AUTH) {
1898 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
1899 return WORK_DONE_DESTROY;
1900 }
1901
1902 mutex_lock(&wk->sdata->u.mgd.mtx);
1903 ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
1904 mutex_unlock(&wk->sdata->u.mgd.mtx);
1905
1906 wk->type = IEEE80211_WORK_AUTH;
1907 wk->probe_auth.tries = 0;
1908 return WORK_DONE_REQUEUE;
1909 }
1910
1911 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
1912 struct cfg80211_auth_request *req)
1913 {
1914 const u8 *ssid;
1915 struct ieee80211_work *wk;
1916 u16 auth_alg;
1917
1918 if (req->local_state_change)
1919 return 0; /* no need to update mac80211 state */
1920
1921 switch (req->auth_type) {
1922 case NL80211_AUTHTYPE_OPEN_SYSTEM:
1923 auth_alg = WLAN_AUTH_OPEN;
1924 break;
1925 case NL80211_AUTHTYPE_SHARED_KEY:
1926 auth_alg = WLAN_AUTH_SHARED_KEY;
1927 break;
1928 case NL80211_AUTHTYPE_FT:
1929 auth_alg = WLAN_AUTH_FT;
1930 break;
1931 case NL80211_AUTHTYPE_NETWORK_EAP:
1932 auth_alg = WLAN_AUTH_LEAP;
1933 break;
1934 default:
1935 return -EOPNOTSUPP;
1936 }
1937
1938 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1939 if (!wk)
1940 return -ENOMEM;
1941
1942 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1943
1944 if (req->ie && req->ie_len) {
1945 memcpy(wk->ie, req->ie, req->ie_len);
1946 wk->ie_len = req->ie_len;
1947 }
1948
1949 if (req->key && req->key_len) {
1950 wk->probe_auth.key_len = req->key_len;
1951 wk->probe_auth.key_idx = req->key_idx;
1952 memcpy(wk->probe_auth.key, req->key, req->key_len);
1953 }
1954
1955 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1956 memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
1957 wk->probe_auth.ssid_len = ssid[1];
1958
1959 wk->probe_auth.algorithm = auth_alg;
1960 wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
1961
1962 /* if we already have a probe, don't probe again */
1963 if (req->bss->proberesp_ies)
1964 wk->type = IEEE80211_WORK_AUTH;
1965 else
1966 wk->type = IEEE80211_WORK_DIRECT_PROBE;
1967 wk->chan = req->bss->channel;
1968 wk->sdata = sdata;
1969 wk->done = ieee80211_probe_auth_done;
1970
1971 ieee80211_add_work(wk);
1972 return 0;
1973 }
1974
1975 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
1976 struct sk_buff *skb)
1977 {
1978 struct ieee80211_mgmt *mgmt;
1979 u16 status;
1980
1981 if (!skb) {
1982 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
1983 return WORK_DONE_DESTROY;
1984 }
1985
1986 mgmt = (void *)skb->data;
1987 status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1988
1989 if (status == WLAN_STATUS_SUCCESS) {
1990 mutex_lock(&wk->sdata->u.mgd.mtx);
1991 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
1992 mutex_unlock(&wk->sdata->u.mgd.mtx);
1993 /* oops -- internal error -- send timeout for now */
1994 cfg80211_send_assoc_timeout(wk->sdata->dev,
1995 wk->filter_ta);
1996 return WORK_DONE_DESTROY;
1997 }
1998 mutex_unlock(&wk->sdata->u.mgd.mtx);
1999 }
2000
2001 cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2002 return WORK_DONE_DESTROY;
2003 }
2004
2005 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2006 struct cfg80211_assoc_request *req)
2007 {
2008 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2009 struct ieee80211_bss *bss = (void *)req->bss->priv;
2010 struct ieee80211_work *wk;
2011 const u8 *ssid;
2012 int i;
2013
2014 mutex_lock(&ifmgd->mtx);
2015 if (ifmgd->associated) {
2016 if (!req->prev_bssid ||
2017 memcmp(req->prev_bssid, ifmgd->associated->bssid,
2018 ETH_ALEN)) {
2019 /*
2020 * We are already associated and the request was not a
2021 * reassociation request from the current BSS, so
2022 * reject it.
2023 */
2024 mutex_unlock(&ifmgd->mtx);
2025 return -EALREADY;
2026 }
2027
2028 /* Trying to reassociate - clear previous association state */
2029 ieee80211_set_disassoc(sdata, true);
2030 }
2031 mutex_unlock(&ifmgd->mtx);
2032
2033 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2034 if (!wk)
2035 return -ENOMEM;
2036
2037 ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2038 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2039
2040 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2041 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2042 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2043 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2044 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2045
2046
2047 if (req->ie && req->ie_len) {
2048 memcpy(wk->ie, req->ie, req->ie_len);
2049 wk->ie_len = req->ie_len;
2050 } else
2051 wk->ie_len = 0;
2052
2053 wk->assoc.bss = req->bss;
2054
2055 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2056
2057 /* new association always uses requested smps mode */
2058 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2059 if (ifmgd->powersave)
2060 ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2061 else
2062 ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2063 } else
2064 ifmgd->ap_smps = ifmgd->req_smps;
2065
2066 wk->assoc.smps = ifmgd->ap_smps;
2067 /*
2068 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2069 * We still associate in non-HT mode (11a/b/g) if any one of these
2070 * ciphers is configured as pairwise.
2071 * We can set this to true for non-11n hardware, that'll be checked
2072 * separately along with the peer capabilities.
2073 */
2074 wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2075 wk->assoc.capability = req->bss->capability;
2076 wk->assoc.wmm_used = bss->wmm_used;
2077 wk->assoc.supp_rates = bss->supp_rates;
2078 wk->assoc.supp_rates_len = bss->supp_rates_len;
2079 wk->assoc.ht_information_ie =
2080 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2081
2082 if (bss->wmm_used && bss->uapsd_supported &&
2083 (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2084 wk->assoc.uapsd_used = true;
2085 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2086 } else {
2087 wk->assoc.uapsd_used = false;
2088 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2089 }
2090
2091 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2092 memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2093 wk->assoc.ssid_len = ssid[1];
2094
2095 if (req->prev_bssid)
2096 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2097
2098 wk->type = IEEE80211_WORK_ASSOC;
2099 wk->chan = req->bss->channel;
2100 wk->sdata = sdata;
2101 wk->done = ieee80211_assoc_done;
2102
2103 if (req->use_mfp) {
2104 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2105 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2106 } else {
2107 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2108 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2109 }
2110
2111 if (req->crypto.control_port)
2112 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2113 else
2114 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2115
2116 ieee80211_add_work(wk);
2117 return 0;
2118 }
2119
2120 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2121 struct cfg80211_deauth_request *req,
2122 void *cookie)
2123 {
2124 struct ieee80211_local *local = sdata->local;
2125 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2126 struct ieee80211_work *wk;
2127 const u8 *bssid = req->bss->bssid;
2128
2129 mutex_lock(&ifmgd->mtx);
2130
2131 if (ifmgd->associated == req->bss) {
2132 bssid = req->bss->bssid;
2133 ieee80211_set_disassoc(sdata, true);
2134 mutex_unlock(&ifmgd->mtx);
2135 } else {
2136 bool not_auth_yet = false;
2137
2138 mutex_unlock(&ifmgd->mtx);
2139
2140 mutex_lock(&local->work_mtx);
2141 list_for_each_entry(wk, &local->work_list, list) {
2142 if (wk->sdata != sdata)
2143 continue;
2144
2145 if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2146 wk->type != IEEE80211_WORK_AUTH)
2147 continue;
2148
2149 if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2150 continue;
2151
2152 not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2153 list_del_rcu(&wk->list);
2154 free_work(wk);
2155 break;
2156 }
2157 mutex_unlock(&local->work_mtx);
2158
2159 /*
2160 * If somebody requests authentication and we haven't
2161 * sent out an auth frame yet there's no need to send
2162 * out a deauth frame either. If the state was PROBE,
2163 * then this is the case. If it's AUTH we have sent a
2164 * frame, and if it's IDLE we have completed the auth
2165 * process already.
2166 */
2167 if (not_auth_yet) {
2168 __cfg80211_auth_canceled(sdata->dev, bssid);
2169 return 0;
2170 }
2171 }
2172
2173 printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2174 sdata->name, bssid, req->reason_code);
2175
2176 ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2177 req->reason_code, cookie,
2178 !req->local_state_change);
2179
2180 ieee80211_recalc_idle(sdata->local);
2181
2182 return 0;
2183 }
2184
2185 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2186 struct cfg80211_disassoc_request *req,
2187 void *cookie)
2188 {
2189 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2190 u8 bssid[ETH_ALEN];
2191
2192 mutex_lock(&ifmgd->mtx);
2193
2194 /*
2195 * cfg80211 should catch this ... but it's racy since
2196 * we can receive a disassoc frame, process it, hand it
2197 * to cfg80211 while that's in a locked section already
2198 * trying to tell us that the user wants to disconnect.
2199 */
2200 if (ifmgd->associated != req->bss) {
2201 mutex_unlock(&ifmgd->mtx);
2202 return -ENOLINK;
2203 }
2204
2205 printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2206 sdata->name, req->bss->bssid, req->reason_code);
2207
2208 memcpy(bssid, req->bss->bssid, ETH_ALEN);
2209 ieee80211_set_disassoc(sdata, false);
2210
2211 mutex_unlock(&ifmgd->mtx);
2212
2213 ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2214 IEEE80211_STYPE_DISASSOC, req->reason_code,
2215 cookie, !req->local_state_change);
2216 sta_info_destroy_addr(sdata, bssid);
2217
2218 ieee80211_recalc_idle(sdata->local);
2219
2220 return 0;
2221 }
2222
2223 int ieee80211_mgd_action(struct ieee80211_sub_if_data *sdata,
2224 struct ieee80211_channel *chan,
2225 enum nl80211_channel_type channel_type,
2226 const u8 *buf, size_t len, u64 *cookie)
2227 {
2228 struct ieee80211_local *local = sdata->local;
2229 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2230 struct sk_buff *skb;
2231
2232 /* Check that we are on the requested channel for transmission */
2233 if ((chan != local->tmp_channel ||
2234 channel_type != local->tmp_channel_type) &&
2235 (chan != local->oper_channel ||
2236 channel_type != local->oper_channel_type))
2237 return -EBUSY;
2238
2239 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len);
2240 if (!skb)
2241 return -ENOMEM;
2242 skb_reserve(skb, local->hw.extra_tx_headroom);
2243
2244 memcpy(skb_put(skb, len), buf, len);
2245
2246 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
2247 IEEE80211_SKB_CB(skb)->flags |=
2248 IEEE80211_TX_INTFL_DONT_ENCRYPT;
2249 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX |
2250 IEEE80211_TX_CTL_REQ_TX_STATUS;
2251 skb->dev = sdata->dev;
2252 ieee80211_tx_skb(sdata, skb);
2253
2254 *cookie = (unsigned long) skb;
2255 return 0;
2256 }
2257
2258 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2259 enum nl80211_cqm_rssi_threshold_event rssi_event,
2260 gfp_t gfp)
2261 {
2262 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2263
2264 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2265 }
2266 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
Linux kernel - Deliverables
This page took 0.078471 seconds and 5 git commands to generate.