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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/vapier...
[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 #define TMR_RUNNING_TIMER 0
50 #define TMR_RUNNING_CHANSW 1
51
52 /*
53 * All cfg80211 functions have to be called outside a locked
54 * section so that they can acquire a lock themselves... This
55 * is much simpler than queuing up things in cfg80211, but we
56 * do need some indirection for that here.
57 */
58 enum rx_mgmt_action {
59 /* no action required */
60 RX_MGMT_NONE,
61
62 /* caller must call cfg80211_send_rx_auth() */
63 RX_MGMT_CFG80211_AUTH,
64
65 /* caller must call cfg80211_send_rx_assoc() */
66 RX_MGMT_CFG80211_ASSOC,
67
68 /* caller must call cfg80211_send_deauth() */
69 RX_MGMT_CFG80211_DEAUTH,
70
71 /* caller must call cfg80211_send_disassoc() */
72 RX_MGMT_CFG80211_DISASSOC,
73
74 /* caller must tell cfg80211 about internal error */
75 RX_MGMT_CFG80211_ASSOC_ERROR,
76 };
77
78 /* utils */
79 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
80 {
81 WARN_ON(!mutex_is_locked(&ifmgd->mtx));
82 }
83
84 /*
85 * We can have multiple work items (and connection probing)
86 * scheduling this timer, but we need to take care to only
87 * reschedule it when it should fire _earlier_ than it was
88 * asked for before, or if it's not pending right now. This
89 * function ensures that. Note that it then is required to
90 * run this function for all timeouts after the first one
91 * has happened -- the work that runs from this timer will
92 * do that.
93 */
94 static void run_again(struct ieee80211_if_managed *ifmgd,
95 unsigned long timeout)
96 {
97 ASSERT_MGD_MTX(ifmgd);
98
99 if (!timer_pending(&ifmgd->timer) ||
100 time_before(timeout, ifmgd->timer.expires))
101 mod_timer(&ifmgd->timer, timeout);
102 }
103
104 static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata)
105 {
106 if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
107 return;
108
109 mod_timer(&sdata->u.mgd.bcn_mon_timer,
110 round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME));
111 }
112
113 static int ecw2cw(int ecw)
114 {
115 return (1 << ecw) - 1;
116 }
117
118 /*
119 * ieee80211_enable_ht should be called only after the operating band
120 * has been determined as ht configuration depends on the hw's
121 * HT abilities for a specific band.
122 */
123 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
124 struct ieee80211_ht_info *hti,
125 const u8 *bssid, u16 ap_ht_cap_flags)
126 {
127 struct ieee80211_local *local = sdata->local;
128 struct ieee80211_supported_band *sband;
129 struct sta_info *sta;
130 u32 changed = 0;
131 u16 ht_opmode;
132 bool enable_ht = true, ht_changed;
133 enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
134
135 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
136
137 /* HT is not supported */
138 if (!sband->ht_cap.ht_supported)
139 enable_ht = false;
140
141 /* check that channel matches the right operating channel */
142 if (local->hw.conf.channel->center_freq !=
143 ieee80211_channel_to_frequency(hti->control_chan))
144 enable_ht = false;
145
146 if (enable_ht) {
147 channel_type = NL80211_CHAN_HT20;
148
149 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
150 (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
151 (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
152 switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
153 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
154 if (!(local->hw.conf.channel->flags &
155 IEEE80211_CHAN_NO_HT40PLUS))
156 channel_type = NL80211_CHAN_HT40PLUS;
157 break;
158 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
159 if (!(local->hw.conf.channel->flags &
160 IEEE80211_CHAN_NO_HT40MINUS))
161 channel_type = NL80211_CHAN_HT40MINUS;
162 break;
163 }
164 }
165 }
166
167 ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
168 channel_type != local->hw.conf.channel_type;
169
170 local->oper_channel_type = channel_type;
171
172 if (ht_changed) {
173 /* channel_type change automatically detected */
174 ieee80211_hw_config(local, 0);
175
176 rcu_read_lock();
177 sta = sta_info_get(sdata, bssid);
178 if (sta)
179 rate_control_rate_update(local, sband, sta,
180 IEEE80211_RC_HT_CHANGED,
181 local->oper_channel_type);
182 rcu_read_unlock();
183 }
184
185 /* disable HT */
186 if (!enable_ht)
187 return 0;
188
189 ht_opmode = le16_to_cpu(hti->operation_mode);
190
191 /* if bss configuration changed store the new one */
192 if (!sdata->ht_opmode_valid ||
193 sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
194 changed |= BSS_CHANGED_HT;
195 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
196 sdata->ht_opmode_valid = true;
197 }
198
199 return changed;
200 }
201
202 /* frame sending functions */
203
204 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
205 const u8 *bssid, u16 stype, u16 reason,
206 void *cookie)
207 {
208 struct ieee80211_local *local = sdata->local;
209 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
210 struct sk_buff *skb;
211 struct ieee80211_mgmt *mgmt;
212
213 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
214 if (!skb) {
215 printk(KERN_DEBUG "%s: failed to allocate buffer for "
216 "deauth/disassoc frame\n", sdata->name);
217 return;
218 }
219 skb_reserve(skb, local->hw.extra_tx_headroom);
220
221 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
222 memset(mgmt, 0, 24);
223 memcpy(mgmt->da, bssid, ETH_ALEN);
224 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
225 memcpy(mgmt->bssid, bssid, ETH_ALEN);
226 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
227 skb_put(skb, 2);
228 /* u.deauth.reason_code == u.disassoc.reason_code */
229 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
230
231 if (stype == IEEE80211_STYPE_DEAUTH)
232 if (cookie)
233 __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
234 else
235 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
236 else
237 if (cookie)
238 __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
239 else
240 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
241 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
242 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
243 ieee80211_tx_skb(sdata, skb);
244 }
245
246 void ieee80211_send_pspoll(struct ieee80211_local *local,
247 struct ieee80211_sub_if_data *sdata)
248 {
249 struct ieee80211_pspoll *pspoll;
250 struct sk_buff *skb;
251
252 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
253 if (!skb)
254 return;
255
256 pspoll = (struct ieee80211_pspoll *) skb->data;
257 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
258
259 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
260 ieee80211_tx_skb(sdata, skb);
261 }
262
263 void ieee80211_send_nullfunc(struct ieee80211_local *local,
264 struct ieee80211_sub_if_data *sdata,
265 int powersave)
266 {
267 struct sk_buff *skb;
268 struct ieee80211_hdr_3addr *nullfunc;
269
270 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
271 if (!skb)
272 return;
273
274 nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
275 if (powersave)
276 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
277
278 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
279 ieee80211_tx_skb(sdata, skb);
280 }
281
282 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
283 struct ieee80211_sub_if_data *sdata)
284 {
285 struct sk_buff *skb;
286 struct ieee80211_hdr *nullfunc;
287 __le16 fc;
288
289 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
290 return;
291
292 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
293 if (!skb) {
294 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
295 "nullfunc frame\n", sdata->name);
296 return;
297 }
298 skb_reserve(skb, local->hw.extra_tx_headroom);
299
300 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
301 memset(nullfunc, 0, 30);
302 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
303 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
304 nullfunc->frame_control = fc;
305 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
306 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
307 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
308 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
309
310 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
311 ieee80211_tx_skb(sdata, skb);
312 }
313
314 /* spectrum management related things */
315 static void ieee80211_chswitch_work(struct work_struct *work)
316 {
317 struct ieee80211_sub_if_data *sdata =
318 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
319 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
320
321 if (!ieee80211_sdata_running(sdata))
322 return;
323
324 mutex_lock(&ifmgd->mtx);
325 if (!ifmgd->associated)
326 goto out;
327
328 sdata->local->oper_channel = sdata->local->csa_channel;
329 ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL);
330
331 /* XXX: shouldn't really modify cfg80211-owned data! */
332 ifmgd->associated->channel = sdata->local->oper_channel;
333
334 ieee80211_wake_queues_by_reason(&sdata->local->hw,
335 IEEE80211_QUEUE_STOP_REASON_CSA);
336 out:
337 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
338 mutex_unlock(&ifmgd->mtx);
339 }
340
341 static void ieee80211_chswitch_timer(unsigned long data)
342 {
343 struct ieee80211_sub_if_data *sdata =
344 (struct ieee80211_sub_if_data *) data;
345 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
346
347 if (sdata->local->quiescing) {
348 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
349 return;
350 }
351
352 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
353 }
354
355 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
356 struct ieee80211_channel_sw_ie *sw_elem,
357 struct ieee80211_bss *bss)
358 {
359 struct cfg80211_bss *cbss =
360 container_of((void *)bss, struct cfg80211_bss, priv);
361 struct ieee80211_channel *new_ch;
362 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
363 int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
364
365 ASSERT_MGD_MTX(ifmgd);
366
367 if (!ifmgd->associated)
368 return;
369
370 if (sdata->local->scanning)
371 return;
372
373 /* Disregard subsequent beacons if we are already running a timer
374 processing a CSA */
375
376 if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
377 return;
378
379 new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
380 if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
381 return;
382
383 sdata->local->csa_channel = new_ch;
384
385 if (sw_elem->count <= 1) {
386 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
387 } else {
388 ieee80211_stop_queues_by_reason(&sdata->local->hw,
389 IEEE80211_QUEUE_STOP_REASON_CSA);
390 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
391 mod_timer(&ifmgd->chswitch_timer,
392 jiffies +
393 msecs_to_jiffies(sw_elem->count *
394 cbss->beacon_interval));
395 }
396 }
397
398 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
399 u16 capab_info, u8 *pwr_constr_elem,
400 u8 pwr_constr_elem_len)
401 {
402 struct ieee80211_conf *conf = &sdata->local->hw.conf;
403
404 if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
405 return;
406
407 /* Power constraint IE length should be 1 octet */
408 if (pwr_constr_elem_len != 1)
409 return;
410
411 if ((*pwr_constr_elem <= conf->channel->max_power) &&
412 (*pwr_constr_elem != sdata->local->power_constr_level)) {
413 sdata->local->power_constr_level = *pwr_constr_elem;
414 ieee80211_hw_config(sdata->local, 0);
415 }
416 }
417
418 /* powersave */
419 static void ieee80211_enable_ps(struct ieee80211_local *local,
420 struct ieee80211_sub_if_data *sdata)
421 {
422 struct ieee80211_conf *conf = &local->hw.conf;
423
424 /*
425 * If we are scanning right now then the parameters will
426 * take effect when scan finishes.
427 */
428 if (local->scanning)
429 return;
430
431 if (conf->dynamic_ps_timeout > 0 &&
432 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
433 mod_timer(&local->dynamic_ps_timer, jiffies +
434 msecs_to_jiffies(conf->dynamic_ps_timeout));
435 } else {
436 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
437 ieee80211_send_nullfunc(local, sdata, 1);
438
439 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
440 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
441 return;
442
443 conf->flags |= IEEE80211_CONF_PS;
444 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
445 }
446 }
447
448 static void ieee80211_change_ps(struct ieee80211_local *local)
449 {
450 struct ieee80211_conf *conf = &local->hw.conf;
451
452 if (local->ps_sdata) {
453 ieee80211_enable_ps(local, local->ps_sdata);
454 } else if (conf->flags & IEEE80211_CONF_PS) {
455 conf->flags &= ~IEEE80211_CONF_PS;
456 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
457 del_timer_sync(&local->dynamic_ps_timer);
458 cancel_work_sync(&local->dynamic_ps_enable_work);
459 }
460 }
461
462 /* need to hold RTNL or interface lock */
463 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
464 {
465 struct ieee80211_sub_if_data *sdata, *found = NULL;
466 int count = 0;
467
468 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
469 local->ps_sdata = NULL;
470 return;
471 }
472
473 if (!list_empty(&local->work_list)) {
474 local->ps_sdata = NULL;
475 goto change;
476 }
477
478 list_for_each_entry(sdata, &local->interfaces, list) {
479 if (!ieee80211_sdata_running(sdata))
480 continue;
481 if (sdata->vif.type != NL80211_IFTYPE_STATION)
482 continue;
483 found = sdata;
484 count++;
485 }
486
487 if (count == 1 && found->u.mgd.powersave &&
488 found->u.mgd.associated &&
489 found->u.mgd.associated->beacon_ies &&
490 !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
491 IEEE80211_STA_CONNECTION_POLL))) {
492 s32 beaconint_us;
493
494 if (latency < 0)
495 latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
496
497 beaconint_us = ieee80211_tu_to_usec(
498 found->vif.bss_conf.beacon_int);
499
500 if (beaconint_us > latency) {
501 local->ps_sdata = NULL;
502 } else {
503 struct ieee80211_bss *bss;
504 int maxslp = 1;
505 u8 dtimper;
506
507 bss = (void *)found->u.mgd.associated->priv;
508 dtimper = bss->dtim_period;
509
510 /* If the TIM IE is invalid, pretend the value is 1 */
511 if (!dtimper)
512 dtimper = 1;
513 else if (dtimper > 1)
514 maxslp = min_t(int, dtimper,
515 latency / beaconint_us);
516
517 local->hw.conf.max_sleep_period = maxslp;
518 local->hw.conf.ps_dtim_period = dtimper;
519 local->ps_sdata = found;
520 }
521 } else {
522 local->ps_sdata = NULL;
523 }
524
525 change:
526 ieee80211_change_ps(local);
527 }
528
529 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
530 {
531 struct ieee80211_local *local =
532 container_of(work, struct ieee80211_local,
533 dynamic_ps_disable_work);
534
535 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
536 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
537 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
538 }
539
540 ieee80211_wake_queues_by_reason(&local->hw,
541 IEEE80211_QUEUE_STOP_REASON_PS);
542 }
543
544 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
545 {
546 struct ieee80211_local *local =
547 container_of(work, struct ieee80211_local,
548 dynamic_ps_enable_work);
549 struct ieee80211_sub_if_data *sdata = local->ps_sdata;
550 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
551
552 /* can only happen when PS was just disabled anyway */
553 if (!sdata)
554 return;
555
556 if (local->hw.conf.flags & IEEE80211_CONF_PS)
557 return;
558
559 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
560 (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
561 ieee80211_send_nullfunc(local, sdata, 1);
562
563 if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
564 (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
565 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
566 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
567 local->hw.conf.flags |= IEEE80211_CONF_PS;
568 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
569 }
570 }
571
572 void ieee80211_dynamic_ps_timer(unsigned long data)
573 {
574 struct ieee80211_local *local = (void *) data;
575
576 if (local->quiescing || local->suspended)
577 return;
578
579 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
580 }
581
582 /* MLME */
583 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
584 struct ieee80211_if_managed *ifmgd,
585 u8 *wmm_param, size_t wmm_param_len)
586 {
587 struct ieee80211_tx_queue_params params;
588 size_t left;
589 int count;
590 u8 *pos, uapsd_queues = 0;
591
592 if (local->hw.queues < 4)
593 return;
594
595 if (!wmm_param)
596 return;
597
598 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
599 return;
600
601 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
602 uapsd_queues = local->uapsd_queues;
603
604 count = wmm_param[6] & 0x0f;
605 if (count == ifmgd->wmm_last_param_set)
606 return;
607 ifmgd->wmm_last_param_set = count;
608
609 pos = wmm_param + 8;
610 left = wmm_param_len - 8;
611
612 memset(&params, 0, sizeof(params));
613
614 local->wmm_acm = 0;
615 for (; left >= 4; left -= 4, pos += 4) {
616 int aci = (pos[0] >> 5) & 0x03;
617 int acm = (pos[0] >> 4) & 0x01;
618 bool uapsd = false;
619 int queue;
620
621 switch (aci) {
622 case 1: /* AC_BK */
623 queue = 3;
624 if (acm)
625 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
626 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
627 uapsd = true;
628 break;
629 case 2: /* AC_VI */
630 queue = 1;
631 if (acm)
632 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
633 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
634 uapsd = true;
635 break;
636 case 3: /* AC_VO */
637 queue = 0;
638 if (acm)
639 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
640 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
641 uapsd = true;
642 break;
643 case 0: /* AC_BE */
644 default:
645 queue = 2;
646 if (acm)
647 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
648 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
649 uapsd = true;
650 break;
651 }
652
653 params.aifs = pos[0] & 0x0f;
654 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
655 params.cw_min = ecw2cw(pos[1] & 0x0f);
656 params.txop = get_unaligned_le16(pos + 2);
657 params.uapsd = uapsd;
658
659 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
660 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
661 "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
662 wiphy_name(local->hw.wiphy), queue, aci, acm,
663 params.aifs, params.cw_min, params.cw_max, params.txop,
664 params.uapsd);
665 #endif
666 if (drv_conf_tx(local, queue, &params) && local->ops->conf_tx)
667 printk(KERN_DEBUG "%s: failed to set TX queue "
668 "parameters for queue %d\n",
669 wiphy_name(local->hw.wiphy), queue);
670 }
671 }
672
673 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
674 u16 capab, bool erp_valid, u8 erp)
675 {
676 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
677 u32 changed = 0;
678 bool use_protection;
679 bool use_short_preamble;
680 bool use_short_slot;
681
682 if (erp_valid) {
683 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
684 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
685 } else {
686 use_protection = false;
687 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
688 }
689
690 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
691 if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
692 use_short_slot = true;
693
694 if (use_protection != bss_conf->use_cts_prot) {
695 bss_conf->use_cts_prot = use_protection;
696 changed |= BSS_CHANGED_ERP_CTS_PROT;
697 }
698
699 if (use_short_preamble != bss_conf->use_short_preamble) {
700 bss_conf->use_short_preamble = use_short_preamble;
701 changed |= BSS_CHANGED_ERP_PREAMBLE;
702 }
703
704 if (use_short_slot != bss_conf->use_short_slot) {
705 bss_conf->use_short_slot = use_short_slot;
706 changed |= BSS_CHANGED_ERP_SLOT;
707 }
708
709 return changed;
710 }
711
712 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
713 struct cfg80211_bss *cbss,
714 u32 bss_info_changed)
715 {
716 struct ieee80211_bss *bss = (void *)cbss->priv;
717 struct ieee80211_local *local = sdata->local;
718
719 bss_info_changed |= BSS_CHANGED_ASSOC;
720 /* set timing information */
721 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
722 sdata->vif.bss_conf.timestamp = cbss->tsf;
723
724 bss_info_changed |= BSS_CHANGED_BEACON_INT;
725 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
726 cbss->capability, bss->has_erp_value, bss->erp_value);
727
728 sdata->u.mgd.associated = cbss;
729 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
730
731 /* just to be sure */
732 sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
733 IEEE80211_STA_BEACON_POLL);
734
735 /*
736 * Always handle WMM once after association regardless
737 * of the first value the AP uses. Setting -1 here has
738 * that effect because the AP values is an unsigned
739 * 4-bit value.
740 */
741 sdata->u.mgd.wmm_last_param_set = -1;
742
743 ieee80211_led_assoc(local, 1);
744
745 sdata->vif.bss_conf.assoc = 1;
746 /*
747 * For now just always ask the driver to update the basic rateset
748 * when we have associated, we aren't checking whether it actually
749 * changed or not.
750 */
751 bss_info_changed |= BSS_CHANGED_BASIC_RATES;
752
753 /* And the BSSID changed - we're associated now */
754 bss_info_changed |= BSS_CHANGED_BSSID;
755
756 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
757
758 mutex_lock(&local->iflist_mtx);
759 ieee80211_recalc_ps(local, -1);
760 ieee80211_recalc_smps(local, sdata);
761 mutex_unlock(&local->iflist_mtx);
762
763 netif_tx_start_all_queues(sdata->dev);
764 netif_carrier_on(sdata->dev);
765 }
766
767 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata)
768 {
769 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
770 struct ieee80211_local *local = sdata->local;
771 struct sta_info *sta;
772 u32 changed = 0, config_changed = 0;
773 u8 bssid[ETH_ALEN];
774
775 ASSERT_MGD_MTX(ifmgd);
776
777 if (WARN_ON(!ifmgd->associated))
778 return;
779
780 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
781
782 ifmgd->associated = NULL;
783 memset(ifmgd->bssid, 0, ETH_ALEN);
784
785 /*
786 * we need to commit the associated = NULL change because the
787 * scan code uses that to determine whether this iface should
788 * go to/wake up from powersave or not -- and could otherwise
789 * wake the queues erroneously.
790 */
791 smp_mb();
792
793 /*
794 * Thus, we can only afterwards stop the queues -- to account
795 * for the case where another CPU is finishing a scan at this
796 * time -- we don't want the scan code to enable queues.
797 */
798
799 netif_tx_stop_all_queues(sdata->dev);
800 netif_carrier_off(sdata->dev);
801
802 rcu_read_lock();
803 sta = sta_info_get(sdata, bssid);
804 if (sta) {
805 set_sta_flags(sta, WLAN_STA_DISASSOC);
806 ieee80211_sta_tear_down_BA_sessions(sta);
807 }
808 rcu_read_unlock();
809
810 changed |= ieee80211_reset_erp_info(sdata);
811
812 ieee80211_led_assoc(local, 0);
813 changed |= BSS_CHANGED_ASSOC;
814 sdata->vif.bss_conf.assoc = false;
815
816 ieee80211_set_wmm_default(sdata);
817
818 /* channel(_type) changes are handled by ieee80211_hw_config */
819 local->oper_channel_type = NL80211_CHAN_NO_HT;
820
821 /* on the next assoc, re-program HT parameters */
822 sdata->ht_opmode_valid = false;
823
824 local->power_constr_level = 0;
825
826 del_timer_sync(&local->dynamic_ps_timer);
827 cancel_work_sync(&local->dynamic_ps_enable_work);
828
829 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
830 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
831 config_changed |= IEEE80211_CONF_CHANGE_PS;
832 }
833
834 ieee80211_hw_config(local, config_changed);
835
836 /* And the BSSID changed -- not very interesting here */
837 changed |= BSS_CHANGED_BSSID;
838 ieee80211_bss_info_change_notify(sdata, changed);
839
840 sta_info_destroy_addr(sdata, bssid);
841 }
842
843 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
844 struct ieee80211_hdr *hdr)
845 {
846 /*
847 * We can postpone the mgd.timer whenever receiving unicast frames
848 * from AP because we know that the connection is working both ways
849 * at that time. But multicast frames (and hence also beacons) must
850 * be ignored here, because we need to trigger the timer during
851 * data idle periods for sending the periodic probe request to the
852 * AP we're connected to.
853 */
854 if (is_multicast_ether_addr(hdr->addr1))
855 return;
856
857 mod_timer(&sdata->u.mgd.conn_mon_timer,
858 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
859 }
860
861 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
862 {
863 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
864 const u8 *ssid;
865
866 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
867 ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
868 ssid + 2, ssid[1], NULL, 0);
869
870 ifmgd->probe_send_count++;
871 ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
872 run_again(ifmgd, ifmgd->probe_timeout);
873 }
874
875 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
876 bool beacon)
877 {
878 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
879 bool already = false;
880
881 if (!ieee80211_sdata_running(sdata))
882 return;
883
884 if (sdata->local->scanning)
885 return;
886
887 if (sdata->local->tmp_channel)
888 return;
889
890 mutex_lock(&ifmgd->mtx);
891
892 if (!ifmgd->associated)
893 goto out;
894
895 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
896 if (beacon && net_ratelimit())
897 printk(KERN_DEBUG "%s: detected beacon loss from AP "
898 "- sending probe request\n", sdata->name);
899 #endif
900
901 /*
902 * The driver/our work has already reported this event or the
903 * connection monitoring has kicked in and we have already sent
904 * a probe request. Or maybe the AP died and the driver keeps
905 * reporting until we disassociate...
906 *
907 * In either case we have to ignore the current call to this
908 * function (except for setting the correct probe reason bit)
909 * because otherwise we would reset the timer every time and
910 * never check whether we received a probe response!
911 */
912 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
913 IEEE80211_STA_CONNECTION_POLL))
914 already = true;
915
916 if (beacon)
917 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
918 else
919 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
920
921 if (already)
922 goto out;
923
924 mutex_lock(&sdata->local->iflist_mtx);
925 ieee80211_recalc_ps(sdata->local, -1);
926 mutex_unlock(&sdata->local->iflist_mtx);
927
928 ifmgd->probe_send_count = 0;
929 ieee80211_mgd_probe_ap_send(sdata);
930 out:
931 mutex_unlock(&ifmgd->mtx);
932 }
933
934 void ieee80211_beacon_loss_work(struct work_struct *work)
935 {
936 struct ieee80211_sub_if_data *sdata =
937 container_of(work, struct ieee80211_sub_if_data,
938 u.mgd.beacon_loss_work);
939
940 ieee80211_mgd_probe_ap(sdata, true);
941 }
942
943 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
944 {
945 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
946
947 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
948 }
949 EXPORT_SYMBOL(ieee80211_beacon_loss);
950
951 static enum rx_mgmt_action __must_check
952 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
953 struct ieee80211_mgmt *mgmt, size_t len)
954 {
955 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
956 const u8 *bssid = NULL;
957 u16 reason_code;
958
959 if (len < 24 + 2)
960 return RX_MGMT_NONE;
961
962 ASSERT_MGD_MTX(ifmgd);
963
964 bssid = ifmgd->associated->bssid;
965
966 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
967
968 printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
969 sdata->name, bssid, reason_code);
970
971 ieee80211_set_disassoc(sdata);
972 ieee80211_recalc_idle(sdata->local);
973
974 return RX_MGMT_CFG80211_DEAUTH;
975 }
976
977
978 static enum rx_mgmt_action __must_check
979 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
980 struct ieee80211_mgmt *mgmt, size_t len)
981 {
982 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
983 u16 reason_code;
984
985 if (len < 24 + 2)
986 return RX_MGMT_NONE;
987
988 ASSERT_MGD_MTX(ifmgd);
989
990 if (WARN_ON(!ifmgd->associated))
991 return RX_MGMT_NONE;
992
993 if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
994 return RX_MGMT_NONE;
995
996 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
997
998 printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
999 sdata->name, mgmt->sa, reason_code);
1000
1001 ieee80211_set_disassoc(sdata);
1002 ieee80211_recalc_idle(sdata->local);
1003 return RX_MGMT_CFG80211_DISASSOC;
1004 }
1005
1006
1007 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1008 struct ieee80211_mgmt *mgmt, size_t len)
1009 {
1010 struct ieee80211_sub_if_data *sdata = wk->sdata;
1011 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1012 struct ieee80211_local *local = sdata->local;
1013 struct ieee80211_supported_band *sband;
1014 struct sta_info *sta;
1015 struct cfg80211_bss *cbss = wk->assoc.bss;
1016 u8 *pos;
1017 u32 rates, basic_rates;
1018 u16 capab_info, aid;
1019 struct ieee802_11_elems elems;
1020 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1021 u32 changed = 0;
1022 int i, j, err;
1023 bool have_higher_than_11mbit = false;
1024 u16 ap_ht_cap_flags;
1025
1026 /* AssocResp and ReassocResp have identical structure */
1027
1028 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1029 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1030
1031 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1032 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1033 "set\n", sdata->name, aid);
1034 aid &= ~(BIT(15) | BIT(14));
1035
1036 pos = mgmt->u.assoc_resp.variable;
1037 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1038
1039 if (!elems.supp_rates) {
1040 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1041 sdata->name);
1042 return false;
1043 }
1044
1045 ifmgd->aid = aid;
1046
1047 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1048 if (!sta) {
1049 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1050 " the AP\n", sdata->name);
1051 return false;
1052 }
1053
1054 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1055 WLAN_STA_ASSOC_AP);
1056 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1057 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1058
1059 rates = 0;
1060 basic_rates = 0;
1061 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1062
1063 for (i = 0; i < elems.supp_rates_len; i++) {
1064 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1065 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1066
1067 if (rate > 110)
1068 have_higher_than_11mbit = true;
1069
1070 for (j = 0; j < sband->n_bitrates; j++) {
1071 if (sband->bitrates[j].bitrate == rate) {
1072 rates |= BIT(j);
1073 if (is_basic)
1074 basic_rates |= BIT(j);
1075 break;
1076 }
1077 }
1078 }
1079
1080 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1081 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1082 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1083
1084 if (rate > 110)
1085 have_higher_than_11mbit = true;
1086
1087 for (j = 0; j < sband->n_bitrates; j++) {
1088 if (sband->bitrates[j].bitrate == rate) {
1089 rates |= BIT(j);
1090 if (is_basic)
1091 basic_rates |= BIT(j);
1092 break;
1093 }
1094 }
1095 }
1096
1097 sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1098 sdata->vif.bss_conf.basic_rates = basic_rates;
1099
1100 /* cf. IEEE 802.11 9.2.12 */
1101 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1102 have_higher_than_11mbit)
1103 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1104 else
1105 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1106
1107 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1108 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1109 elems.ht_cap_elem, &sta->sta.ht_cap);
1110
1111 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1112
1113 rate_control_rate_init(sta);
1114
1115 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1116 set_sta_flags(sta, WLAN_STA_MFP);
1117
1118 if (elems.wmm_param)
1119 set_sta_flags(sta, WLAN_STA_WME);
1120
1121 err = sta_info_insert(sta);
1122 sta = NULL;
1123 if (err) {
1124 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1125 " the AP (error %d)\n", sdata->name, err);
1126 return false;
1127 }
1128
1129 if (elems.wmm_param)
1130 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1131 elems.wmm_param_len);
1132 else
1133 ieee80211_set_wmm_default(sdata);
1134
1135 local->oper_channel = wk->chan;
1136
1137 if (elems.ht_info_elem && elems.wmm_param &&
1138 (sdata->local->hw.queues >= 4) &&
1139 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1140 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1141 cbss->bssid, ap_ht_cap_flags);
1142
1143 /* set AID and assoc capability,
1144 * ieee80211_set_associated() will tell the driver */
1145 bss_conf->aid = aid;
1146 bss_conf->assoc_capability = capab_info;
1147 ieee80211_set_associated(sdata, cbss, changed);
1148
1149 /*
1150 * If we're using 4-addr mode, let the AP know that we're
1151 * doing so, so that it can create the STA VLAN on its side
1152 */
1153 if (ifmgd->use_4addr)
1154 ieee80211_send_4addr_nullfunc(local, sdata);
1155
1156 /*
1157 * Start timer to probe the connection to the AP now.
1158 * Also start the timer that will detect beacon loss.
1159 */
1160 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1161 mod_beacon_timer(sdata);
1162
1163 return true;
1164 }
1165
1166
1167 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1168 struct ieee80211_mgmt *mgmt,
1169 size_t len,
1170 struct ieee80211_rx_status *rx_status,
1171 struct ieee802_11_elems *elems,
1172 bool beacon)
1173 {
1174 struct ieee80211_local *local = sdata->local;
1175 int freq;
1176 struct ieee80211_bss *bss;
1177 struct ieee80211_channel *channel;
1178 bool need_ps = false;
1179
1180 if (sdata->u.mgd.associated) {
1181 bss = (void *)sdata->u.mgd.associated->priv;
1182 /* not previously set so we may need to recalc */
1183 need_ps = !bss->dtim_period;
1184 }
1185
1186 if (elems->ds_params && elems->ds_params_len == 1)
1187 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1188 else
1189 freq = rx_status->freq;
1190
1191 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1192
1193 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1194 return;
1195
1196 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1197 channel, beacon);
1198 if (bss)
1199 ieee80211_rx_bss_put(local, bss);
1200
1201 if (!sdata->u.mgd.associated)
1202 return;
1203
1204 if (need_ps) {
1205 mutex_lock(&local->iflist_mtx);
1206 ieee80211_recalc_ps(local, -1);
1207 mutex_unlock(&local->iflist_mtx);
1208 }
1209
1210 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1211 (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1212 ETH_ALEN) == 0)) {
1213 struct ieee80211_channel_sw_ie *sw_elem =
1214 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1215 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1216 }
1217 }
1218
1219
1220 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1221 struct sk_buff *skb)
1222 {
1223 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1224 struct ieee80211_if_managed *ifmgd;
1225 struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1226 size_t baselen, len = skb->len;
1227 struct ieee802_11_elems elems;
1228
1229 ifmgd = &sdata->u.mgd;
1230
1231 ASSERT_MGD_MTX(ifmgd);
1232
1233 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1234 return; /* ignore ProbeResp to foreign address */
1235
1236 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1237 if (baselen > len)
1238 return;
1239
1240 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1241 &elems);
1242
1243 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1244
1245 if (ifmgd->associated &&
1246 memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1247 ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1248 IEEE80211_STA_CONNECTION_POLL)) {
1249 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1250 IEEE80211_STA_BEACON_POLL);
1251 mutex_lock(&sdata->local->iflist_mtx);
1252 ieee80211_recalc_ps(sdata->local, -1);
1253 mutex_unlock(&sdata->local->iflist_mtx);
1254 /*
1255 * We've received a probe response, but are not sure whether
1256 * we have or will be receiving any beacons or data, so let's
1257 * schedule the timers again, just in case.
1258 */
1259 mod_beacon_timer(sdata);
1260 mod_timer(&ifmgd->conn_mon_timer,
1261 round_jiffies_up(jiffies +
1262 IEEE80211_CONNECTION_IDLE_TIME));
1263 }
1264 }
1265
1266 /*
1267 * This is the canonical list of information elements we care about,
1268 * the filter code also gives us all changes to the Microsoft OUI
1269 * (00:50:F2) vendor IE which is used for WMM which we need to track.
1270 *
1271 * We implement beacon filtering in software since that means we can
1272 * avoid processing the frame here and in cfg80211, and userspace
1273 * will not be able to tell whether the hardware supports it or not.
1274 *
1275 * XXX: This list needs to be dynamic -- userspace needs to be able to
1276 * add items it requires. It also needs to be able to tell us to
1277 * look out for other vendor IEs.
1278 */
1279 static const u64 care_about_ies =
1280 (1ULL << WLAN_EID_COUNTRY) |
1281 (1ULL << WLAN_EID_ERP_INFO) |
1282 (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1283 (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1284 (1ULL << WLAN_EID_HT_CAPABILITY) |
1285 (1ULL << WLAN_EID_HT_INFORMATION);
1286
1287 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1288 struct ieee80211_mgmt *mgmt,
1289 size_t len,
1290 struct ieee80211_rx_status *rx_status)
1291 {
1292 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1293 size_t baselen;
1294 struct ieee802_11_elems elems;
1295 struct ieee80211_local *local = sdata->local;
1296 u32 changed = 0;
1297 bool erp_valid, directed_tim = false;
1298 u8 erp_value = 0;
1299 u32 ncrc;
1300 u8 *bssid;
1301
1302 ASSERT_MGD_MTX(ifmgd);
1303
1304 /* Process beacon from the current BSS */
1305 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1306 if (baselen > len)
1307 return;
1308
1309 if (rx_status->freq != local->hw.conf.channel->center_freq)
1310 return;
1311
1312 /*
1313 * We might have received a number of frames, among them a
1314 * disassoc frame and a beacon...
1315 */
1316 if (!ifmgd->associated)
1317 return;
1318
1319 bssid = ifmgd->associated->bssid;
1320
1321 /*
1322 * And in theory even frames from a different AP we were just
1323 * associated to a split-second ago!
1324 */
1325 if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1326 return;
1327
1328 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1329 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1330 if (net_ratelimit()) {
1331 printk(KERN_DEBUG "%s: cancelling probereq poll due "
1332 "to a received beacon\n", sdata->name);
1333 }
1334 #endif
1335 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1336 mutex_lock(&local->iflist_mtx);
1337 ieee80211_recalc_ps(local, -1);
1338 mutex_unlock(&local->iflist_mtx);
1339 }
1340
1341 /*
1342 * Push the beacon loss detection into the future since
1343 * we are processing a beacon from the AP just now.
1344 */
1345 mod_beacon_timer(sdata);
1346
1347 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1348 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1349 len - baselen, &elems,
1350 care_about_ies, ncrc);
1351
1352 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1353 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1354 ifmgd->aid);
1355
1356 if (ncrc != ifmgd->beacon_crc) {
1357 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1358 true);
1359
1360 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1361 elems.wmm_param_len);
1362 }
1363
1364 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1365 if (directed_tim) {
1366 if (local->hw.conf.dynamic_ps_timeout > 0) {
1367 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1368 ieee80211_hw_config(local,
1369 IEEE80211_CONF_CHANGE_PS);
1370 ieee80211_send_nullfunc(local, sdata, 0);
1371 } else {
1372 local->pspolling = true;
1373
1374 /*
1375 * Here is assumed that the driver will be
1376 * able to send ps-poll frame and receive a
1377 * response even though power save mode is
1378 * enabled, but some drivers might require
1379 * to disable power save here. This needs
1380 * to be investigated.
1381 */
1382 ieee80211_send_pspoll(local, sdata);
1383 }
1384 }
1385 }
1386
1387 if (ncrc == ifmgd->beacon_crc)
1388 return;
1389 ifmgd->beacon_crc = ncrc;
1390
1391 if (elems.erp_info && elems.erp_info_len >= 1) {
1392 erp_valid = true;
1393 erp_value = elems.erp_info[0];
1394 } else {
1395 erp_valid = false;
1396 }
1397 changed |= ieee80211_handle_bss_capability(sdata,
1398 le16_to_cpu(mgmt->u.beacon.capab_info),
1399 erp_valid, erp_value);
1400
1401
1402 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1403 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1404 struct sta_info *sta;
1405 struct ieee80211_supported_band *sband;
1406 u16 ap_ht_cap_flags;
1407
1408 rcu_read_lock();
1409
1410 sta = sta_info_get(sdata, bssid);
1411 if (WARN_ON(!sta)) {
1412 rcu_read_unlock();
1413 return;
1414 }
1415
1416 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1417
1418 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1419 elems.ht_cap_elem, &sta->sta.ht_cap);
1420
1421 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1422
1423 rcu_read_unlock();
1424
1425 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1426 bssid, ap_ht_cap_flags);
1427 }
1428
1429 /* Note: country IE parsing is done for us by cfg80211 */
1430 if (elems.country_elem) {
1431 /* TODO: IBSS also needs this */
1432 if (elems.pwr_constr_elem)
1433 ieee80211_handle_pwr_constr(sdata,
1434 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1435 elems.pwr_constr_elem,
1436 elems.pwr_constr_elem_len);
1437 }
1438
1439 ieee80211_bss_info_change_notify(sdata, changed);
1440 }
1441
1442 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1443 struct sk_buff *skb)
1444 {
1445 struct ieee80211_local *local = sdata->local;
1446 struct ieee80211_mgmt *mgmt;
1447 u16 fc;
1448
1449 if (skb->len < 24)
1450 return RX_DROP_MONITOR;
1451
1452 mgmt = (struct ieee80211_mgmt *) skb->data;
1453 fc = le16_to_cpu(mgmt->frame_control);
1454
1455 switch (fc & IEEE80211_FCTL_STYPE) {
1456 case IEEE80211_STYPE_PROBE_RESP:
1457 case IEEE80211_STYPE_BEACON:
1458 case IEEE80211_STYPE_DEAUTH:
1459 case IEEE80211_STYPE_DISASSOC:
1460 case IEEE80211_STYPE_ACTION:
1461 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1462 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
1463 return RX_QUEUED;
1464 }
1465
1466 return RX_DROP_MONITOR;
1467 }
1468
1469 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1470 struct sk_buff *skb)
1471 {
1472 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1473 struct ieee80211_rx_status *rx_status;
1474 struct ieee80211_mgmt *mgmt;
1475 enum rx_mgmt_action rma = RX_MGMT_NONE;
1476 u16 fc;
1477
1478 rx_status = (struct ieee80211_rx_status *) skb->cb;
1479 mgmt = (struct ieee80211_mgmt *) skb->data;
1480 fc = le16_to_cpu(mgmt->frame_control);
1481
1482 mutex_lock(&ifmgd->mtx);
1483
1484 if (ifmgd->associated &&
1485 memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1486 switch (fc & IEEE80211_FCTL_STYPE) {
1487 case IEEE80211_STYPE_BEACON:
1488 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1489 rx_status);
1490 break;
1491 case IEEE80211_STYPE_PROBE_RESP:
1492 ieee80211_rx_mgmt_probe_resp(sdata, skb);
1493 break;
1494 case IEEE80211_STYPE_DEAUTH:
1495 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1496 break;
1497 case IEEE80211_STYPE_DISASSOC:
1498 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1499 break;
1500 case IEEE80211_STYPE_ACTION:
1501 if (mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
1502 break;
1503
1504 ieee80211_sta_process_chanswitch(sdata,
1505 &mgmt->u.action.u.chan_switch.sw_elem,
1506 (void *)ifmgd->associated->priv);
1507 break;
1508 }
1509 mutex_unlock(&ifmgd->mtx);
1510
1511 switch (rma) {
1512 case RX_MGMT_NONE:
1513 /* no action */
1514 break;
1515 case RX_MGMT_CFG80211_DEAUTH:
1516 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1517 break;
1518 case RX_MGMT_CFG80211_DISASSOC:
1519 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1520 break;
1521 default:
1522 WARN(1, "unexpected: %d", rma);
1523 }
1524 goto out;
1525 }
1526
1527 mutex_unlock(&ifmgd->mtx);
1528
1529 if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1530 (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH)
1531 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1532
1533 out:
1534 kfree_skb(skb);
1535 }
1536
1537 static void ieee80211_sta_timer(unsigned long data)
1538 {
1539 struct ieee80211_sub_if_data *sdata =
1540 (struct ieee80211_sub_if_data *) data;
1541 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1542 struct ieee80211_local *local = sdata->local;
1543
1544 if (local->quiescing) {
1545 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1546 return;
1547 }
1548
1549 ieee80211_queue_work(&local->hw, &ifmgd->work);
1550 }
1551
1552 static void ieee80211_sta_work(struct work_struct *work)
1553 {
1554 struct ieee80211_sub_if_data *sdata =
1555 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1556 struct ieee80211_local *local = sdata->local;
1557 struct ieee80211_if_managed *ifmgd;
1558 struct sk_buff *skb;
1559
1560 if (!ieee80211_sdata_running(sdata))
1561 return;
1562
1563 if (local->scanning)
1564 return;
1565
1566 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1567 return;
1568
1569 /*
1570 * ieee80211_queue_work() should have picked up most cases,
1571 * here we'll pick the the rest.
1572 */
1573 if (WARN(local->suspended, "STA MLME work scheduled while "
1574 "going to suspend\n"))
1575 return;
1576
1577 ifmgd = &sdata->u.mgd;
1578
1579 /* first process frames to avoid timing out while a frame is pending */
1580 while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1581 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1582
1583 /* then process the rest of the work */
1584 mutex_lock(&ifmgd->mtx);
1585
1586 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1587 IEEE80211_STA_CONNECTION_POLL) &&
1588 ifmgd->associated) {
1589 u8 bssid[ETH_ALEN];
1590
1591 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1592 if (time_is_after_jiffies(ifmgd->probe_timeout))
1593 run_again(ifmgd, ifmgd->probe_timeout);
1594
1595 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1596 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1597 printk(KERN_DEBUG "No probe response from AP %pM"
1598 " after %dms, try %d\n", bssid,
1599 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1600 ifmgd->probe_send_count);
1601 #endif
1602 ieee80211_mgd_probe_ap_send(sdata);
1603 } else {
1604 /*
1605 * We actually lost the connection ... or did we?
1606 * Let's make sure!
1607 */
1608 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1609 IEEE80211_STA_BEACON_POLL);
1610 printk(KERN_DEBUG "No probe response from AP %pM"
1611 " after %dms, disconnecting.\n",
1612 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1613 ieee80211_set_disassoc(sdata);
1614 ieee80211_recalc_idle(local);
1615 mutex_unlock(&ifmgd->mtx);
1616 /*
1617 * must be outside lock due to cfg80211,
1618 * but that's not a problem.
1619 */
1620 ieee80211_send_deauth_disassoc(sdata, bssid,
1621 IEEE80211_STYPE_DEAUTH,
1622 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1623 NULL);
1624 mutex_lock(&ifmgd->mtx);
1625 }
1626 }
1627
1628 mutex_unlock(&ifmgd->mtx);
1629 }
1630
1631 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1632 {
1633 struct ieee80211_sub_if_data *sdata =
1634 (struct ieee80211_sub_if_data *) data;
1635 struct ieee80211_local *local = sdata->local;
1636
1637 if (local->quiescing)
1638 return;
1639
1640 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
1641 }
1642
1643 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1644 {
1645 struct ieee80211_sub_if_data *sdata =
1646 (struct ieee80211_sub_if_data *) data;
1647 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1648 struct ieee80211_local *local = sdata->local;
1649
1650 if (local->quiescing)
1651 return;
1652
1653 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1654 }
1655
1656 static void ieee80211_sta_monitor_work(struct work_struct *work)
1657 {
1658 struct ieee80211_sub_if_data *sdata =
1659 container_of(work, struct ieee80211_sub_if_data,
1660 u.mgd.monitor_work);
1661
1662 ieee80211_mgd_probe_ap(sdata, false);
1663 }
1664
1665 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1666 {
1667 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1668 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1669 IEEE80211_STA_CONNECTION_POLL);
1670
1671 /* let's probe the connection once */
1672 ieee80211_queue_work(&sdata->local->hw,
1673 &sdata->u.mgd.monitor_work);
1674 /* and do all the other regular work too */
1675 ieee80211_queue_work(&sdata->local->hw,
1676 &sdata->u.mgd.work);
1677 }
1678 }
1679
1680 #ifdef CONFIG_PM
1681 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1682 {
1683 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1684
1685 /*
1686 * we need to use atomic bitops for the running bits
1687 * only because both timers might fire at the same
1688 * time -- the code here is properly synchronised.
1689 */
1690
1691 cancel_work_sync(&ifmgd->work);
1692 cancel_work_sync(&ifmgd->beacon_loss_work);
1693 if (del_timer_sync(&ifmgd->timer))
1694 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1695
1696 cancel_work_sync(&ifmgd->chswitch_work);
1697 if (del_timer_sync(&ifmgd->chswitch_timer))
1698 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1699
1700 cancel_work_sync(&ifmgd->monitor_work);
1701 /* these will just be re-established on connection */
1702 del_timer_sync(&ifmgd->conn_mon_timer);
1703 del_timer_sync(&ifmgd->bcn_mon_timer);
1704 }
1705
1706 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1707 {
1708 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1709
1710 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1711 add_timer(&ifmgd->timer);
1712 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1713 add_timer(&ifmgd->chswitch_timer);
1714 }
1715 #endif
1716
1717 /* interface setup */
1718 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1719 {
1720 struct ieee80211_if_managed *ifmgd;
1721
1722 ifmgd = &sdata->u.mgd;
1723 INIT_WORK(&ifmgd->work, ieee80211_sta_work);
1724 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1725 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1726 INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
1727 setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1728 (unsigned long) sdata);
1729 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1730 (unsigned long) sdata);
1731 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1732 (unsigned long) sdata);
1733 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1734 (unsigned long) sdata);
1735 skb_queue_head_init(&ifmgd->skb_queue);
1736
1737 ifmgd->flags = 0;
1738
1739 mutex_init(&ifmgd->mtx);
1740
1741 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1742 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1743 else
1744 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1745 }
1746
1747 /* scan finished notification */
1748 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1749 {
1750 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1751
1752 /* Restart STA timers */
1753 rcu_read_lock();
1754 list_for_each_entry_rcu(sdata, &local->interfaces, list)
1755 ieee80211_restart_sta_timer(sdata);
1756 rcu_read_unlock();
1757 }
1758
1759 int ieee80211_max_network_latency(struct notifier_block *nb,
1760 unsigned long data, void *dummy)
1761 {
1762 s32 latency_usec = (s32) data;
1763 struct ieee80211_local *local =
1764 container_of(nb, struct ieee80211_local,
1765 network_latency_notifier);
1766
1767 mutex_lock(&local->iflist_mtx);
1768 ieee80211_recalc_ps(local, latency_usec);
1769 mutex_unlock(&local->iflist_mtx);
1770
1771 return 0;
1772 }
1773
1774 /* config hooks */
1775 static enum work_done_result
1776 ieee80211_probe_auth_done(struct ieee80211_work *wk,
1777 struct sk_buff *skb)
1778 {
1779 if (!skb) {
1780 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
1781 return WORK_DONE_DESTROY;
1782 }
1783
1784 if (wk->type == IEEE80211_WORK_AUTH) {
1785 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
1786 return WORK_DONE_DESTROY;
1787 }
1788
1789 mutex_lock(&wk->sdata->u.mgd.mtx);
1790 ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
1791 mutex_unlock(&wk->sdata->u.mgd.mtx);
1792
1793 wk->type = IEEE80211_WORK_AUTH;
1794 wk->probe_auth.tries = 0;
1795 return WORK_DONE_REQUEUE;
1796 }
1797
1798 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
1799 struct cfg80211_auth_request *req)
1800 {
1801 const u8 *ssid;
1802 struct ieee80211_work *wk;
1803 u16 auth_alg;
1804
1805 switch (req->auth_type) {
1806 case NL80211_AUTHTYPE_OPEN_SYSTEM:
1807 auth_alg = WLAN_AUTH_OPEN;
1808 break;
1809 case NL80211_AUTHTYPE_SHARED_KEY:
1810 auth_alg = WLAN_AUTH_SHARED_KEY;
1811 break;
1812 case NL80211_AUTHTYPE_FT:
1813 auth_alg = WLAN_AUTH_FT;
1814 break;
1815 case NL80211_AUTHTYPE_NETWORK_EAP:
1816 auth_alg = WLAN_AUTH_LEAP;
1817 break;
1818 default:
1819 return -EOPNOTSUPP;
1820 }
1821
1822 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1823 if (!wk)
1824 return -ENOMEM;
1825
1826 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1827
1828 if (req->ie && req->ie_len) {
1829 memcpy(wk->ie, req->ie, req->ie_len);
1830 wk->ie_len = req->ie_len;
1831 }
1832
1833 if (req->key && req->key_len) {
1834 wk->probe_auth.key_len = req->key_len;
1835 wk->probe_auth.key_idx = req->key_idx;
1836 memcpy(wk->probe_auth.key, req->key, req->key_len);
1837 }
1838
1839 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1840 memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
1841 wk->probe_auth.ssid_len = ssid[1];
1842
1843 wk->probe_auth.algorithm = auth_alg;
1844 wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
1845
1846 /* if we already have a probe, don't probe again */
1847 if (req->bss->proberesp_ies)
1848 wk->type = IEEE80211_WORK_AUTH;
1849 else
1850 wk->type = IEEE80211_WORK_DIRECT_PROBE;
1851 wk->chan = req->bss->channel;
1852 wk->sdata = sdata;
1853 wk->done = ieee80211_probe_auth_done;
1854
1855 ieee80211_add_work(wk);
1856 return 0;
1857 }
1858
1859 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
1860 struct sk_buff *skb)
1861 {
1862 struct ieee80211_mgmt *mgmt;
1863 u16 status;
1864
1865 if (!skb) {
1866 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
1867 return WORK_DONE_DESTROY;
1868 }
1869
1870 mgmt = (void *)skb->data;
1871 status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1872
1873 if (status == WLAN_STATUS_SUCCESS) {
1874 mutex_lock(&wk->sdata->u.mgd.mtx);
1875 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
1876 mutex_unlock(&wk->sdata->u.mgd.mtx);
1877 /* oops -- internal error -- send timeout for now */
1878 cfg80211_send_assoc_timeout(wk->sdata->dev,
1879 wk->filter_ta);
1880 return WORK_DONE_DESTROY;
1881 }
1882 mutex_unlock(&wk->sdata->u.mgd.mtx);
1883 }
1884
1885 cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
1886 return WORK_DONE_DESTROY;
1887 }
1888
1889 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
1890 struct cfg80211_assoc_request *req)
1891 {
1892 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1893 struct ieee80211_bss *bss = (void *)req->bss->priv;
1894 struct ieee80211_work *wk;
1895 const u8 *ssid;
1896 int i;
1897
1898 mutex_lock(&ifmgd->mtx);
1899 if (ifmgd->associated) {
1900 if (!req->prev_bssid ||
1901 memcmp(req->prev_bssid, ifmgd->associated->bssid,
1902 ETH_ALEN)) {
1903 /*
1904 * We are already associated and the request was not a
1905 * reassociation request from the current BSS, so
1906 * reject it.
1907 */
1908 mutex_unlock(&ifmgd->mtx);
1909 return -EALREADY;
1910 }
1911
1912 /* Trying to reassociate - clear previous association state */
1913 ieee80211_set_disassoc(sdata);
1914 }
1915 mutex_unlock(&ifmgd->mtx);
1916
1917 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1918 if (!wk)
1919 return -ENOMEM;
1920
1921 ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
1922 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1923
1924 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
1925 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
1926 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
1927 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
1928 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
1929
1930
1931 if (req->ie && req->ie_len) {
1932 memcpy(wk->ie, req->ie, req->ie_len);
1933 wk->ie_len = req->ie_len;
1934 } else
1935 wk->ie_len = 0;
1936
1937 wk->assoc.bss = req->bss;
1938
1939 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1940
1941 /* new association always uses requested smps mode */
1942 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
1943 if (ifmgd->powersave)
1944 ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
1945 else
1946 ifmgd->ap_smps = IEEE80211_SMPS_OFF;
1947 } else
1948 ifmgd->ap_smps = ifmgd->req_smps;
1949
1950 wk->assoc.smps = ifmgd->ap_smps;
1951 /*
1952 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
1953 * We still associate in non-HT mode (11a/b/g) if any one of these
1954 * ciphers is configured as pairwise.
1955 * We can set this to true for non-11n hardware, that'll be checked
1956 * separately along with the peer capabilities.
1957 */
1958 wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
1959 wk->assoc.capability = req->bss->capability;
1960 wk->assoc.wmm_used = bss->wmm_used;
1961 wk->assoc.supp_rates = bss->supp_rates;
1962 wk->assoc.supp_rates_len = bss->supp_rates_len;
1963 wk->assoc.ht_information_ie =
1964 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
1965
1966 if (bss->wmm_used && bss->uapsd_supported &&
1967 (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
1968 wk->assoc.uapsd_used = true;
1969 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
1970 } else {
1971 wk->assoc.uapsd_used = false;
1972 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
1973 }
1974
1975 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1976 memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
1977 wk->assoc.ssid_len = ssid[1];
1978
1979 if (req->prev_bssid)
1980 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
1981
1982 wk->type = IEEE80211_WORK_ASSOC;
1983 wk->chan = req->bss->channel;
1984 wk->sdata = sdata;
1985 wk->done = ieee80211_assoc_done;
1986
1987 if (req->use_mfp) {
1988 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
1989 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
1990 } else {
1991 ifmgd->mfp = IEEE80211_MFP_DISABLED;
1992 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
1993 }
1994
1995 if (req->crypto.control_port)
1996 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
1997 else
1998 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
1999
2000 ieee80211_add_work(wk);
2001 return 0;
2002 }
2003
2004 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2005 struct cfg80211_deauth_request *req,
2006 void *cookie)
2007 {
2008 struct ieee80211_local *local = sdata->local;
2009 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2010 struct ieee80211_work *wk;
2011 const u8 *bssid = req->bss->bssid;
2012
2013 mutex_lock(&ifmgd->mtx);
2014
2015 if (ifmgd->associated == req->bss) {
2016 bssid = req->bss->bssid;
2017 ieee80211_set_disassoc(sdata);
2018 mutex_unlock(&ifmgd->mtx);
2019 } else {
2020 bool not_auth_yet = false;
2021
2022 mutex_unlock(&ifmgd->mtx);
2023
2024 mutex_lock(&local->work_mtx);
2025 list_for_each_entry(wk, &local->work_list, list) {
2026 if (wk->sdata != sdata)
2027 continue;
2028
2029 if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2030 wk->type != IEEE80211_WORK_AUTH)
2031 continue;
2032
2033 if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2034 continue;
2035
2036 not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2037 list_del_rcu(&wk->list);
2038 free_work(wk);
2039 break;
2040 }
2041 mutex_unlock(&local->work_mtx);
2042
2043 /*
2044 * If somebody requests authentication and we haven't
2045 * sent out an auth frame yet there's no need to send
2046 * out a deauth frame either. If the state was PROBE,
2047 * then this is the case. If it's AUTH we have sent a
2048 * frame, and if it's IDLE we have completed the auth
2049 * process already.
2050 */
2051 if (not_auth_yet) {
2052 __cfg80211_auth_canceled(sdata->dev, bssid);
2053 return 0;
2054 }
2055 }
2056
2057 printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2058 sdata->name, bssid, req->reason_code);
2059
2060 ieee80211_send_deauth_disassoc(sdata, bssid,
2061 IEEE80211_STYPE_DEAUTH, req->reason_code,
2062 cookie);
2063
2064 ieee80211_recalc_idle(sdata->local);
2065
2066 return 0;
2067 }
2068
2069 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2070 struct cfg80211_disassoc_request *req,
2071 void *cookie)
2072 {
2073 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2074
2075 mutex_lock(&ifmgd->mtx);
2076
2077 /*
2078 * cfg80211 should catch this ... but it's racy since
2079 * we can receive a disassoc frame, process it, hand it
2080 * to cfg80211 while that's in a locked section already
2081 * trying to tell us that the user wants to disconnect.
2082 */
2083 if (ifmgd->associated != req->bss) {
2084 mutex_unlock(&ifmgd->mtx);
2085 return -ENOLINK;
2086 }
2087
2088 printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2089 sdata->name, req->bss->bssid, req->reason_code);
2090
2091 ieee80211_set_disassoc(sdata);
2092
2093 mutex_unlock(&ifmgd->mtx);
2094
2095 ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2096 IEEE80211_STYPE_DISASSOC, req->reason_code,
2097 cookie);
2098
2099 ieee80211_recalc_idle(sdata->local);
2100
2101 return 0;
2102 }
2103
2104 int ieee80211_mgd_action(struct ieee80211_sub_if_data *sdata,
2105 struct ieee80211_channel *chan,
2106 enum nl80211_channel_type channel_type,
2107 const u8 *buf, size_t len, u64 *cookie)
2108 {
2109 struct ieee80211_local *local = sdata->local;
2110 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2111 struct sk_buff *skb;
2112
2113 /* Check that we are on the requested channel for transmission */
2114 if ((chan != local->tmp_channel ||
2115 channel_type != local->tmp_channel_type) &&
2116 (chan != local->oper_channel ||
2117 channel_type != local->oper_channel_type))
2118 return -EBUSY;
2119
2120 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len);
2121 if (!skb)
2122 return -ENOMEM;
2123 skb_reserve(skb, local->hw.extra_tx_headroom);
2124
2125 memcpy(skb_put(skb, len), buf, len);
2126
2127 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
2128 IEEE80211_SKB_CB(skb)->flags |=
2129 IEEE80211_TX_INTFL_DONT_ENCRYPT;
2130 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX |
2131 IEEE80211_TX_CTL_REQ_TX_STATUS;
2132 skb->dev = sdata->dev;
2133 ieee80211_tx_skb(sdata, skb);
2134
2135 *cookie = (unsigned long) skb;
2136 return 0;
2137 }
Linux kernel - Deliverables
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