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Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
[deliverable/linux.git] / net / mac80211 / mlme.c
1 /*
2 * BSS client mode implementation
3 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4 * Copyright 2004, Instant802 Networks, Inc.
5 * Copyright 2005, Devicescape Software, Inc.
6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14 #include <linux/delay.h>
15 #include <linux/if_ether.h>
16 #include <linux/skbuff.h>
17 #include <linux/if_arp.h>
18 #include <linux/etherdevice.h>
19 #include <linux/rtnetlink.h>
20 #include <linux/pm_qos_params.h>
21 #include <linux/crc32.h>
22 #include <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 rcu_read_unlock();
182 }
183
184 /* disable HT */
185 if (!enable_ht)
186 return 0;
187
188 ht_opmode = le16_to_cpu(hti->operation_mode);
189
190 /* if bss configuration changed store the new one */
191 if (!sdata->ht_opmode_valid ||
192 sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
193 changed |= BSS_CHANGED_HT;
194 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
195 sdata->ht_opmode_valid = true;
196 }
197
198 return changed;
199 }
200
201 /* frame sending functions */
202
203 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
204 const u8 *bssid, u16 stype, u16 reason,
205 void *cookie)
206 {
207 struct ieee80211_local *local = sdata->local;
208 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
209 struct sk_buff *skb;
210 struct ieee80211_mgmt *mgmt;
211
212 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
213 if (!skb) {
214 printk(KERN_DEBUG "%s: failed to allocate buffer for "
215 "deauth/disassoc frame\n", sdata->name);
216 return;
217 }
218 skb_reserve(skb, local->hw.extra_tx_headroom);
219
220 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
221 memset(mgmt, 0, 24);
222 memcpy(mgmt->da, bssid, ETH_ALEN);
223 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
224 memcpy(mgmt->bssid, bssid, ETH_ALEN);
225 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
226 skb_put(skb, 2);
227 /* u.deauth.reason_code == u.disassoc.reason_code */
228 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
229
230 if (stype == IEEE80211_STYPE_DEAUTH)
231 if (cookie)
232 __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
233 else
234 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
235 else
236 if (cookie)
237 __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
238 else
239 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
240 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
241 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
242 ieee80211_tx_skb(sdata, skb);
243 }
244
245 void ieee80211_send_pspoll(struct ieee80211_local *local,
246 struct ieee80211_sub_if_data *sdata)
247 {
248 struct ieee80211_pspoll *pspoll;
249 struct sk_buff *skb;
250
251 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
252 if (!skb)
253 return;
254
255 pspoll = (struct ieee80211_pspoll *) skb->data;
256 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
257
258 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
259 ieee80211_tx_skb(sdata, skb);
260 }
261
262 void ieee80211_send_nullfunc(struct ieee80211_local *local,
263 struct ieee80211_sub_if_data *sdata,
264 int powersave)
265 {
266 struct sk_buff *skb;
267 struct ieee80211_hdr_3addr *nullfunc;
268
269 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
270 if (!skb)
271 return;
272
273 nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
274 if (powersave)
275 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
276
277 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
278 ieee80211_tx_skb(sdata, skb);
279 }
280
281 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
282 struct ieee80211_sub_if_data *sdata)
283 {
284 struct sk_buff *skb;
285 struct ieee80211_hdr *nullfunc;
286 __le16 fc;
287
288 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
289 return;
290
291 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
292 if (!skb) {
293 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
294 "nullfunc frame\n", sdata->name);
295 return;
296 }
297 skb_reserve(skb, local->hw.extra_tx_headroom);
298
299 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
300 memset(nullfunc, 0, 30);
301 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
302 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
303 nullfunc->frame_control = fc;
304 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
305 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
306 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
307 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
308
309 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
310 ieee80211_tx_skb(sdata, skb);
311 }
312
313 /* spectrum management related things */
314 static void ieee80211_chswitch_work(struct work_struct *work)
315 {
316 struct ieee80211_sub_if_data *sdata =
317 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
318 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
319
320 if (!ieee80211_sdata_running(sdata))
321 return;
322
323 mutex_lock(&ifmgd->mtx);
324 if (!ifmgd->associated)
325 goto out;
326
327 sdata->local->oper_channel = sdata->local->csa_channel;
328 ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL);
329
330 /* XXX: shouldn't really modify cfg80211-owned data! */
331 ifmgd->associated->channel = sdata->local->oper_channel;
332
333 ieee80211_wake_queues_by_reason(&sdata->local->hw,
334 IEEE80211_QUEUE_STOP_REASON_CSA);
335 out:
336 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
337 mutex_unlock(&ifmgd->mtx);
338 }
339
340 static void ieee80211_chswitch_timer(unsigned long data)
341 {
342 struct ieee80211_sub_if_data *sdata =
343 (struct ieee80211_sub_if_data *) data;
344 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
345
346 if (sdata->local->quiescing) {
347 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
348 return;
349 }
350
351 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
352 }
353
354 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
355 struct ieee80211_channel_sw_ie *sw_elem,
356 struct ieee80211_bss *bss)
357 {
358 struct cfg80211_bss *cbss =
359 container_of((void *)bss, struct cfg80211_bss, priv);
360 struct ieee80211_channel *new_ch;
361 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
362 int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
363
364 ASSERT_MGD_MTX(ifmgd);
365
366 if (!ifmgd->associated)
367 return;
368
369 if (sdata->local->scanning)
370 return;
371
372 /* Disregard subsequent beacons if we are already running a timer
373 processing a CSA */
374
375 if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
376 return;
377
378 new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
379 if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
380 return;
381
382 sdata->local->csa_channel = new_ch;
383
384 if (sw_elem->count <= 1) {
385 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
386 } else {
387 ieee80211_stop_queues_by_reason(&sdata->local->hw,
388 IEEE80211_QUEUE_STOP_REASON_CSA);
389 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
390 mod_timer(&ifmgd->chswitch_timer,
391 jiffies +
392 msecs_to_jiffies(sw_elem->count *
393 cbss->beacon_interval));
394 }
395 }
396
397 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
398 u16 capab_info, u8 *pwr_constr_elem,
399 u8 pwr_constr_elem_len)
400 {
401 struct ieee80211_conf *conf = &sdata->local->hw.conf;
402
403 if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
404 return;
405
406 /* Power constraint IE length should be 1 octet */
407 if (pwr_constr_elem_len != 1)
408 return;
409
410 if ((*pwr_constr_elem <= conf->channel->max_power) &&
411 (*pwr_constr_elem != sdata->local->power_constr_level)) {
412 sdata->local->power_constr_level = *pwr_constr_elem;
413 ieee80211_hw_config(sdata->local, 0);
414 }
415 }
416
417 /* powersave */
418 static void ieee80211_enable_ps(struct ieee80211_local *local,
419 struct ieee80211_sub_if_data *sdata)
420 {
421 struct ieee80211_conf *conf = &local->hw.conf;
422
423 /*
424 * If we are scanning right now then the parameters will
425 * take effect when scan finishes.
426 */
427 if (local->scanning)
428 return;
429
430 if (conf->dynamic_ps_timeout > 0 &&
431 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
432 mod_timer(&local->dynamic_ps_timer, jiffies +
433 msecs_to_jiffies(conf->dynamic_ps_timeout));
434 } else {
435 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
436 ieee80211_send_nullfunc(local, sdata, 1);
437
438 if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
439 conf->flags |= IEEE80211_CONF_PS;
440 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
441 }
442 }
443 }
444
445 static void ieee80211_change_ps(struct ieee80211_local *local)
446 {
447 struct ieee80211_conf *conf = &local->hw.conf;
448
449 if (local->ps_sdata) {
450 ieee80211_enable_ps(local, local->ps_sdata);
451 } else if (conf->flags & IEEE80211_CONF_PS) {
452 conf->flags &= ~IEEE80211_CONF_PS;
453 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
454 del_timer_sync(&local->dynamic_ps_timer);
455 cancel_work_sync(&local->dynamic_ps_enable_work);
456 }
457 }
458
459 /* need to hold RTNL or interface lock */
460 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
461 {
462 struct ieee80211_sub_if_data *sdata, *found = NULL;
463 int count = 0;
464
465 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
466 local->ps_sdata = NULL;
467 return;
468 }
469
470 if (!list_empty(&local->work_list)) {
471 local->ps_sdata = NULL;
472 goto change;
473 }
474
475 list_for_each_entry(sdata, &local->interfaces, list) {
476 if (!ieee80211_sdata_running(sdata))
477 continue;
478 if (sdata->vif.type != NL80211_IFTYPE_STATION)
479 continue;
480 found = sdata;
481 count++;
482 }
483
484 if (count == 1 && found->u.mgd.powersave &&
485 found->u.mgd.associated &&
486 found->u.mgd.associated->beacon_ies &&
487 !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
488 IEEE80211_STA_CONNECTION_POLL))) {
489 s32 beaconint_us;
490
491 if (latency < 0)
492 latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
493
494 beaconint_us = ieee80211_tu_to_usec(
495 found->vif.bss_conf.beacon_int);
496
497 if (beaconint_us > latency) {
498 local->ps_sdata = NULL;
499 } else {
500 struct ieee80211_bss *bss;
501 int maxslp = 1;
502 u8 dtimper;
503
504 bss = (void *)found->u.mgd.associated->priv;
505 dtimper = bss->dtim_period;
506
507 /* If the TIM IE is invalid, pretend the value is 1 */
508 if (!dtimper)
509 dtimper = 1;
510 else if (dtimper > 1)
511 maxslp = min_t(int, dtimper,
512 latency / beaconint_us);
513
514 local->hw.conf.max_sleep_period = maxslp;
515 local->hw.conf.ps_dtim_period = dtimper;
516 local->ps_sdata = found;
517 }
518 } else {
519 local->ps_sdata = NULL;
520 }
521
522 change:
523 ieee80211_change_ps(local);
524 }
525
526 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
527 {
528 struct ieee80211_local *local =
529 container_of(work, struct ieee80211_local,
530 dynamic_ps_disable_work);
531
532 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
533 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
534 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
535 }
536
537 ieee80211_wake_queues_by_reason(&local->hw,
538 IEEE80211_QUEUE_STOP_REASON_PS);
539 }
540
541 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
542 {
543 struct ieee80211_local *local =
544 container_of(work, struct ieee80211_local,
545 dynamic_ps_enable_work);
546 struct ieee80211_sub_if_data *sdata = local->ps_sdata;
547 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
548
549 /* can only happen when PS was just disabled anyway */
550 if (!sdata)
551 return;
552
553 if (local->hw.conf.flags & IEEE80211_CONF_PS)
554 return;
555
556 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
557 (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
558 ieee80211_send_nullfunc(local, sdata, 1);
559
560 if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) ||
561 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
562 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
563 local->hw.conf.flags |= IEEE80211_CONF_PS;
564 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
565 }
566 }
567
568 void ieee80211_dynamic_ps_timer(unsigned long data)
569 {
570 struct ieee80211_local *local = (void *) data;
571
572 if (local->quiescing || local->suspended)
573 return;
574
575 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
576 }
577
578 /* MLME */
579 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
580 struct ieee80211_if_managed *ifmgd,
581 u8 *wmm_param, size_t wmm_param_len)
582 {
583 struct ieee80211_tx_queue_params params;
584 size_t left;
585 int count;
586 u8 *pos, uapsd_queues = 0;
587
588 if (local->hw.queues < 4)
589 return;
590
591 if (!wmm_param)
592 return;
593
594 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
595 return;
596
597 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
598 uapsd_queues = local->uapsd_queues;
599
600 count = wmm_param[6] & 0x0f;
601 if (count == ifmgd->wmm_last_param_set)
602 return;
603 ifmgd->wmm_last_param_set = count;
604
605 pos = wmm_param + 8;
606 left = wmm_param_len - 8;
607
608 memset(&params, 0, sizeof(params));
609
610 local->wmm_acm = 0;
611 for (; left >= 4; left -= 4, pos += 4) {
612 int aci = (pos[0] >> 5) & 0x03;
613 int acm = (pos[0] >> 4) & 0x01;
614 bool uapsd = false;
615 int queue;
616
617 switch (aci) {
618 case 1: /* AC_BK */
619 queue = 3;
620 if (acm)
621 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
622 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
623 uapsd = true;
624 break;
625 case 2: /* AC_VI */
626 queue = 1;
627 if (acm)
628 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
629 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
630 uapsd = true;
631 break;
632 case 3: /* AC_VO */
633 queue = 0;
634 if (acm)
635 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
636 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
637 uapsd = true;
638 break;
639 case 0: /* AC_BE */
640 default:
641 queue = 2;
642 if (acm)
643 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
644 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
645 uapsd = true;
646 break;
647 }
648
649 params.aifs = pos[0] & 0x0f;
650 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
651 params.cw_min = ecw2cw(pos[1] & 0x0f);
652 params.txop = get_unaligned_le16(pos + 2);
653 params.uapsd = uapsd;
654
655 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
656 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
657 "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
658 wiphy_name(local->hw.wiphy), queue, aci, acm,
659 params.aifs, params.cw_min, params.cw_max, params.txop,
660 params.uapsd);
661 #endif
662 if (drv_conf_tx(local, queue, &params) && local->ops->conf_tx)
663 printk(KERN_DEBUG "%s: failed to set TX queue "
664 "parameters for queue %d\n",
665 wiphy_name(local->hw.wiphy), queue);
666 }
667 }
668
669 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
670 u16 capab, bool erp_valid, u8 erp)
671 {
672 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
673 u32 changed = 0;
674 bool use_protection;
675 bool use_short_preamble;
676 bool use_short_slot;
677
678 if (erp_valid) {
679 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
680 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
681 } else {
682 use_protection = false;
683 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
684 }
685
686 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
687 if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
688 use_short_slot = true;
689
690 if (use_protection != bss_conf->use_cts_prot) {
691 bss_conf->use_cts_prot = use_protection;
692 changed |= BSS_CHANGED_ERP_CTS_PROT;
693 }
694
695 if (use_short_preamble != bss_conf->use_short_preamble) {
696 bss_conf->use_short_preamble = use_short_preamble;
697 changed |= BSS_CHANGED_ERP_PREAMBLE;
698 }
699
700 if (use_short_slot != bss_conf->use_short_slot) {
701 bss_conf->use_short_slot = use_short_slot;
702 changed |= BSS_CHANGED_ERP_SLOT;
703 }
704
705 return changed;
706 }
707
708 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
709 struct cfg80211_bss *cbss,
710 u32 bss_info_changed)
711 {
712 struct ieee80211_bss *bss = (void *)cbss->priv;
713 struct ieee80211_local *local = sdata->local;
714
715 bss_info_changed |= BSS_CHANGED_ASSOC;
716 /* set timing information */
717 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
718 sdata->vif.bss_conf.timestamp = cbss->tsf;
719
720 bss_info_changed |= BSS_CHANGED_BEACON_INT;
721 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
722 cbss->capability, bss->has_erp_value, bss->erp_value);
723
724 sdata->u.mgd.associated = cbss;
725 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
726
727 /* just to be sure */
728 sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
729 IEEE80211_STA_BEACON_POLL);
730
731 /*
732 * Always handle WMM once after association regardless
733 * of the first value the AP uses. Setting -1 here has
734 * that effect because the AP values is an unsigned
735 * 4-bit value.
736 */
737 sdata->u.mgd.wmm_last_param_set = -1;
738
739 ieee80211_led_assoc(local, 1);
740
741 sdata->vif.bss_conf.assoc = 1;
742 /*
743 * For now just always ask the driver to update the basic rateset
744 * when we have associated, we aren't checking whether it actually
745 * changed or not.
746 */
747 bss_info_changed |= BSS_CHANGED_BASIC_RATES;
748
749 /* And the BSSID changed - we're associated now */
750 bss_info_changed |= BSS_CHANGED_BSSID;
751
752 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
753
754 mutex_lock(&local->iflist_mtx);
755 ieee80211_recalc_ps(local, -1);
756 ieee80211_recalc_smps(local, sdata);
757 mutex_unlock(&local->iflist_mtx);
758
759 netif_tx_start_all_queues(sdata->dev);
760 netif_carrier_on(sdata->dev);
761 }
762
763 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata)
764 {
765 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
766 struct ieee80211_local *local = sdata->local;
767 struct sta_info *sta;
768 u32 changed = 0, config_changed = 0;
769 u8 bssid[ETH_ALEN];
770
771 ASSERT_MGD_MTX(ifmgd);
772
773 if (WARN_ON(!ifmgd->associated))
774 return;
775
776 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
777
778 ifmgd->associated = NULL;
779 memset(ifmgd->bssid, 0, ETH_ALEN);
780
781 /*
782 * we need to commit the associated = NULL change because the
783 * scan code uses that to determine whether this iface should
784 * go to/wake up from powersave or not -- and could otherwise
785 * wake the queues erroneously.
786 */
787 smp_mb();
788
789 /*
790 * Thus, we can only afterwards stop the queues -- to account
791 * for the case where another CPU is finishing a scan at this
792 * time -- we don't want the scan code to enable queues.
793 */
794
795 netif_tx_stop_all_queues(sdata->dev);
796 netif_carrier_off(sdata->dev);
797
798 rcu_read_lock();
799 sta = sta_info_get(sdata, bssid);
800 if (sta) {
801 set_sta_flags(sta, WLAN_STA_DISASSOC);
802 ieee80211_sta_tear_down_BA_sessions(sta);
803 }
804 rcu_read_unlock();
805
806 changed |= ieee80211_reset_erp_info(sdata);
807
808 ieee80211_led_assoc(local, 0);
809 changed |= BSS_CHANGED_ASSOC;
810 sdata->vif.bss_conf.assoc = false;
811
812 ieee80211_set_wmm_default(sdata);
813
814 /* channel(_type) changes are handled by ieee80211_hw_config */
815 local->oper_channel_type = NL80211_CHAN_NO_HT;
816
817 /* on the next assoc, re-program HT parameters */
818 sdata->ht_opmode_valid = false;
819
820 local->power_constr_level = 0;
821
822 del_timer_sync(&local->dynamic_ps_timer);
823 cancel_work_sync(&local->dynamic_ps_enable_work);
824
825 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
826 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
827 config_changed |= IEEE80211_CONF_CHANGE_PS;
828 }
829
830 ieee80211_hw_config(local, config_changed);
831
832 /* And the BSSID changed -- not very interesting here */
833 changed |= BSS_CHANGED_BSSID;
834 ieee80211_bss_info_change_notify(sdata, changed);
835
836 sta_info_destroy_addr(sdata, bssid);
837 }
838
839 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
840 struct ieee80211_hdr *hdr)
841 {
842 /*
843 * We can postpone the mgd.timer whenever receiving unicast frames
844 * from AP because we know that the connection is working both ways
845 * at that time. But multicast frames (and hence also beacons) must
846 * be ignored here, because we need to trigger the timer during
847 * data idle periods for sending the periodic probe request to the
848 * AP we're connected to.
849 */
850 if (is_multicast_ether_addr(hdr->addr1))
851 return;
852
853 mod_timer(&sdata->u.mgd.conn_mon_timer,
854 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
855 }
856
857 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
858 {
859 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
860 const u8 *ssid;
861
862 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
863 ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
864 ssid + 2, ssid[1], NULL, 0);
865
866 ifmgd->probe_send_count++;
867 ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
868 run_again(ifmgd, ifmgd->probe_timeout);
869 }
870
871 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
872 bool beacon)
873 {
874 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
875 bool already = false;
876
877 if (!ieee80211_sdata_running(sdata))
878 return;
879
880 if (sdata->local->scanning)
881 return;
882
883 if (sdata->local->tmp_channel)
884 return;
885
886 mutex_lock(&ifmgd->mtx);
887
888 if (!ifmgd->associated)
889 goto out;
890
891 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
892 if (beacon && net_ratelimit())
893 printk(KERN_DEBUG "%s: detected beacon loss from AP "
894 "- sending probe request\n", sdata->name);
895 #endif
896
897 /*
898 * The driver/our work has already reported this event or the
899 * connection monitoring has kicked in and we have already sent
900 * a probe request. Or maybe the AP died and the driver keeps
901 * reporting until we disassociate...
902 *
903 * In either case we have to ignore the current call to this
904 * function (except for setting the correct probe reason bit)
905 * because otherwise we would reset the timer every time and
906 * never check whether we received a probe response!
907 */
908 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
909 IEEE80211_STA_CONNECTION_POLL))
910 already = true;
911
912 if (beacon)
913 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
914 else
915 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
916
917 if (already)
918 goto out;
919
920 mutex_lock(&sdata->local->iflist_mtx);
921 ieee80211_recalc_ps(sdata->local, -1);
922 mutex_unlock(&sdata->local->iflist_mtx);
923
924 ifmgd->probe_send_count = 0;
925 ieee80211_mgd_probe_ap_send(sdata);
926 out:
927 mutex_unlock(&ifmgd->mtx);
928 }
929
930 void ieee80211_beacon_loss_work(struct work_struct *work)
931 {
932 struct ieee80211_sub_if_data *sdata =
933 container_of(work, struct ieee80211_sub_if_data,
934 u.mgd.beacon_loss_work);
935
936 ieee80211_mgd_probe_ap(sdata, true);
937 }
938
939 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
940 {
941 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
942
943 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
944 }
945 EXPORT_SYMBOL(ieee80211_beacon_loss);
946
947 static enum rx_mgmt_action __must_check
948 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
949 struct ieee80211_mgmt *mgmt, size_t len)
950 {
951 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
952 const u8 *bssid = NULL;
953 u16 reason_code;
954
955 if (len < 24 + 2)
956 return RX_MGMT_NONE;
957
958 ASSERT_MGD_MTX(ifmgd);
959
960 bssid = ifmgd->associated->bssid;
961
962 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
963
964 printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
965 sdata->name, bssid, reason_code);
966
967 ieee80211_set_disassoc(sdata);
968 ieee80211_recalc_idle(sdata->local);
969
970 return RX_MGMT_CFG80211_DEAUTH;
971 }
972
973
974 static enum rx_mgmt_action __must_check
975 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
976 struct ieee80211_mgmt *mgmt, size_t len)
977 {
978 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
979 u16 reason_code;
980
981 if (len < 24 + 2)
982 return RX_MGMT_NONE;
983
984 ASSERT_MGD_MTX(ifmgd);
985
986 if (WARN_ON(!ifmgd->associated))
987 return RX_MGMT_NONE;
988
989 if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
990 return RX_MGMT_NONE;
991
992 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
993
994 printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
995 sdata->name, mgmt->sa, reason_code);
996
997 ieee80211_set_disassoc(sdata);
998 ieee80211_recalc_idle(sdata->local);
999 return RX_MGMT_CFG80211_DISASSOC;
1000 }
1001
1002
1003 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1004 struct ieee80211_mgmt *mgmt, size_t len)
1005 {
1006 struct ieee80211_sub_if_data *sdata = wk->sdata;
1007 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1008 struct ieee80211_local *local = sdata->local;
1009 struct ieee80211_supported_band *sband;
1010 struct sta_info *sta;
1011 struct cfg80211_bss *cbss = wk->assoc.bss;
1012 u8 *pos;
1013 u32 rates, basic_rates;
1014 u16 capab_info, aid;
1015 struct ieee802_11_elems elems;
1016 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1017 u32 changed = 0;
1018 int i, j, err;
1019 bool have_higher_than_11mbit = false;
1020 u16 ap_ht_cap_flags;
1021
1022 /* AssocResp and ReassocResp have identical structure */
1023
1024 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1025 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1026
1027 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1028 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1029 "set\n", sdata->name, aid);
1030 aid &= ~(BIT(15) | BIT(14));
1031
1032 pos = mgmt->u.assoc_resp.variable;
1033 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1034
1035 if (!elems.supp_rates) {
1036 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1037 sdata->name);
1038 return false;
1039 }
1040
1041 ifmgd->aid = aid;
1042
1043 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1044 if (!sta) {
1045 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1046 " the AP\n", sdata->name);
1047 return false;
1048 }
1049
1050 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1051 WLAN_STA_ASSOC_AP);
1052 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1053 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1054
1055 rates = 0;
1056 basic_rates = 0;
1057 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1058
1059 for (i = 0; i < elems.supp_rates_len; i++) {
1060 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1061 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1062
1063 if (rate > 110)
1064 have_higher_than_11mbit = true;
1065
1066 for (j = 0; j < sband->n_bitrates; j++) {
1067 if (sband->bitrates[j].bitrate == rate) {
1068 rates |= BIT(j);
1069 if (is_basic)
1070 basic_rates |= BIT(j);
1071 break;
1072 }
1073 }
1074 }
1075
1076 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1077 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1078 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1079
1080 if (rate > 110)
1081 have_higher_than_11mbit = true;
1082
1083 for (j = 0; j < sband->n_bitrates; j++) {
1084 if (sband->bitrates[j].bitrate == rate) {
1085 rates |= BIT(j);
1086 if (is_basic)
1087 basic_rates |= BIT(j);
1088 break;
1089 }
1090 }
1091 }
1092
1093 sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1094 sdata->vif.bss_conf.basic_rates = basic_rates;
1095
1096 /* cf. IEEE 802.11 9.2.12 */
1097 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1098 have_higher_than_11mbit)
1099 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1100 else
1101 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1102
1103 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1104 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1105 elems.ht_cap_elem, &sta->sta.ht_cap);
1106
1107 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1108
1109 rate_control_rate_init(sta);
1110
1111 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1112 set_sta_flags(sta, WLAN_STA_MFP);
1113
1114 if (elems.wmm_param)
1115 set_sta_flags(sta, WLAN_STA_WME);
1116
1117 err = sta_info_insert(sta);
1118 sta = NULL;
1119 if (err) {
1120 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1121 " the AP (error %d)\n", sdata->name, err);
1122 return false;
1123 }
1124
1125 if (elems.wmm_param)
1126 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1127 elems.wmm_param_len);
1128 else
1129 ieee80211_set_wmm_default(sdata);
1130
1131 local->oper_channel = wk->chan;
1132
1133 if (elems.ht_info_elem && elems.wmm_param &&
1134 (sdata->local->hw.queues >= 4) &&
1135 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1136 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1137 cbss->bssid, ap_ht_cap_flags);
1138
1139 /* set AID and assoc capability,
1140 * ieee80211_set_associated() will tell the driver */
1141 bss_conf->aid = aid;
1142 bss_conf->assoc_capability = capab_info;
1143 ieee80211_set_associated(sdata, cbss, changed);
1144
1145 /*
1146 * If we're using 4-addr mode, let the AP know that we're
1147 * doing so, so that it can create the STA VLAN on its side
1148 */
1149 if (ifmgd->use_4addr)
1150 ieee80211_send_4addr_nullfunc(local, sdata);
1151
1152 /*
1153 * Start timer to probe the connection to the AP now.
1154 * Also start the timer that will detect beacon loss.
1155 */
1156 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1157 mod_beacon_timer(sdata);
1158
1159 return true;
1160 }
1161
1162
1163 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1164 struct ieee80211_mgmt *mgmt,
1165 size_t len,
1166 struct ieee80211_rx_status *rx_status,
1167 struct ieee802_11_elems *elems,
1168 bool beacon)
1169 {
1170 struct ieee80211_local *local = sdata->local;
1171 int freq;
1172 struct ieee80211_bss *bss;
1173 struct ieee80211_channel *channel;
1174 bool need_ps = false;
1175
1176 if (sdata->u.mgd.associated) {
1177 bss = (void *)sdata->u.mgd.associated->priv;
1178 /* not previously set so we may need to recalc */
1179 need_ps = !bss->dtim_period;
1180 }
1181
1182 if (elems->ds_params && elems->ds_params_len == 1)
1183 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1184 else
1185 freq = rx_status->freq;
1186
1187 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1188
1189 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1190 return;
1191
1192 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1193 channel, beacon);
1194 if (bss)
1195 ieee80211_rx_bss_put(local, bss);
1196
1197 if (!sdata->u.mgd.associated)
1198 return;
1199
1200 if (need_ps) {
1201 mutex_lock(&local->iflist_mtx);
1202 ieee80211_recalc_ps(local, -1);
1203 mutex_unlock(&local->iflist_mtx);
1204 }
1205
1206 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1207 (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1208 ETH_ALEN) == 0)) {
1209 struct ieee80211_channel_sw_ie *sw_elem =
1210 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1211 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1212 }
1213 }
1214
1215
1216 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1217 struct sk_buff *skb)
1218 {
1219 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1220 struct ieee80211_if_managed *ifmgd;
1221 struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1222 size_t baselen, len = skb->len;
1223 struct ieee802_11_elems elems;
1224
1225 ifmgd = &sdata->u.mgd;
1226
1227 ASSERT_MGD_MTX(ifmgd);
1228
1229 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1230 return; /* ignore ProbeResp to foreign address */
1231
1232 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1233 if (baselen > len)
1234 return;
1235
1236 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1237 &elems);
1238
1239 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1240
1241 if (ifmgd->associated &&
1242 memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1243 ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1244 IEEE80211_STA_CONNECTION_POLL)) {
1245 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1246 IEEE80211_STA_BEACON_POLL);
1247 mutex_lock(&sdata->local->iflist_mtx);
1248 ieee80211_recalc_ps(sdata->local, -1);
1249 mutex_unlock(&sdata->local->iflist_mtx);
1250 /*
1251 * We've received a probe response, but are not sure whether
1252 * we have or will be receiving any beacons or data, so let's
1253 * schedule the timers again, just in case.
1254 */
1255 mod_beacon_timer(sdata);
1256 mod_timer(&ifmgd->conn_mon_timer,
1257 round_jiffies_up(jiffies +
1258 IEEE80211_CONNECTION_IDLE_TIME));
1259 }
1260 }
1261
1262 /*
1263 * This is the canonical list of information elements we care about,
1264 * the filter code also gives us all changes to the Microsoft OUI
1265 * (00:50:F2) vendor IE which is used for WMM which we need to track.
1266 *
1267 * We implement beacon filtering in software since that means we can
1268 * avoid processing the frame here and in cfg80211, and userspace
1269 * will not be able to tell whether the hardware supports it or not.
1270 *
1271 * XXX: This list needs to be dynamic -- userspace needs to be able to
1272 * add items it requires. It also needs to be able to tell us to
1273 * look out for other vendor IEs.
1274 */
1275 static const u64 care_about_ies =
1276 (1ULL << WLAN_EID_COUNTRY) |
1277 (1ULL << WLAN_EID_ERP_INFO) |
1278 (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1279 (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1280 (1ULL << WLAN_EID_HT_CAPABILITY) |
1281 (1ULL << WLAN_EID_HT_INFORMATION);
1282
1283 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1284 struct ieee80211_mgmt *mgmt,
1285 size_t len,
1286 struct ieee80211_rx_status *rx_status)
1287 {
1288 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1289 size_t baselen;
1290 struct ieee802_11_elems elems;
1291 struct ieee80211_local *local = sdata->local;
1292 u32 changed = 0;
1293 bool erp_valid, directed_tim = false;
1294 u8 erp_value = 0;
1295 u32 ncrc;
1296 u8 *bssid;
1297
1298 ASSERT_MGD_MTX(ifmgd);
1299
1300 /* Process beacon from the current BSS */
1301 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1302 if (baselen > len)
1303 return;
1304
1305 if (rx_status->freq != local->hw.conf.channel->center_freq)
1306 return;
1307
1308 /*
1309 * We might have received a number of frames, among them a
1310 * disassoc frame and a beacon...
1311 */
1312 if (!ifmgd->associated)
1313 return;
1314
1315 bssid = ifmgd->associated->bssid;
1316
1317 /*
1318 * And in theory even frames from a different AP we were just
1319 * associated to a split-second ago!
1320 */
1321 if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1322 return;
1323
1324 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1325 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1326 if (net_ratelimit()) {
1327 printk(KERN_DEBUG "%s: cancelling probereq poll due "
1328 "to a received beacon\n", sdata->name);
1329 }
1330 #endif
1331 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1332 mutex_lock(&local->iflist_mtx);
1333 ieee80211_recalc_ps(local, -1);
1334 mutex_unlock(&local->iflist_mtx);
1335 }
1336
1337 /*
1338 * Push the beacon loss detection into the future since
1339 * we are processing a beacon from the AP just now.
1340 */
1341 mod_beacon_timer(sdata);
1342
1343 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1344 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1345 len - baselen, &elems,
1346 care_about_ies, ncrc);
1347
1348 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1349 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1350 ifmgd->aid);
1351
1352 if (ncrc != ifmgd->beacon_crc) {
1353 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1354 true);
1355
1356 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1357 elems.wmm_param_len);
1358 }
1359
1360 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1361 if (directed_tim) {
1362 if (local->hw.conf.dynamic_ps_timeout > 0) {
1363 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1364 ieee80211_hw_config(local,
1365 IEEE80211_CONF_CHANGE_PS);
1366 ieee80211_send_nullfunc(local, sdata, 0);
1367 } else {
1368 local->pspolling = true;
1369
1370 /*
1371 * Here is assumed that the driver will be
1372 * able to send ps-poll frame and receive a
1373 * response even though power save mode is
1374 * enabled, but some drivers might require
1375 * to disable power save here. This needs
1376 * to be investigated.
1377 */
1378 ieee80211_send_pspoll(local, sdata);
1379 }
1380 }
1381 }
1382
1383 if (ncrc == ifmgd->beacon_crc)
1384 return;
1385 ifmgd->beacon_crc = ncrc;
1386
1387 if (elems.erp_info && elems.erp_info_len >= 1) {
1388 erp_valid = true;
1389 erp_value = elems.erp_info[0];
1390 } else {
1391 erp_valid = false;
1392 }
1393 changed |= ieee80211_handle_bss_capability(sdata,
1394 le16_to_cpu(mgmt->u.beacon.capab_info),
1395 erp_valid, erp_value);
1396
1397
1398 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1399 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1400 struct sta_info *sta;
1401 struct ieee80211_supported_band *sband;
1402 u16 ap_ht_cap_flags;
1403
1404 rcu_read_lock();
1405
1406 sta = sta_info_get(sdata, bssid);
1407 if (WARN_ON(!sta)) {
1408 rcu_read_unlock();
1409 return;
1410 }
1411
1412 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1413
1414 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1415 elems.ht_cap_elem, &sta->sta.ht_cap);
1416
1417 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1418
1419 rcu_read_unlock();
1420
1421 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1422 bssid, ap_ht_cap_flags);
1423 }
1424
1425 /* Note: country IE parsing is done for us by cfg80211 */
1426 if (elems.country_elem) {
1427 /* TODO: IBSS also needs this */
1428 if (elems.pwr_constr_elem)
1429 ieee80211_handle_pwr_constr(sdata,
1430 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1431 elems.pwr_constr_elem,
1432 elems.pwr_constr_elem_len);
1433 }
1434
1435 ieee80211_bss_info_change_notify(sdata, changed);
1436 }
1437
1438 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1439 struct sk_buff *skb)
1440 {
1441 struct ieee80211_local *local = sdata->local;
1442 struct ieee80211_mgmt *mgmt;
1443 u16 fc;
1444
1445 if (skb->len < 24)
1446 return RX_DROP_MONITOR;
1447
1448 mgmt = (struct ieee80211_mgmt *) skb->data;
1449 fc = le16_to_cpu(mgmt->frame_control);
1450
1451 switch (fc & IEEE80211_FCTL_STYPE) {
1452 case IEEE80211_STYPE_PROBE_RESP:
1453 case IEEE80211_STYPE_BEACON:
1454 case IEEE80211_STYPE_DEAUTH:
1455 case IEEE80211_STYPE_DISASSOC:
1456 case IEEE80211_STYPE_ACTION:
1457 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1458 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
1459 return RX_QUEUED;
1460 }
1461
1462 return RX_DROP_MONITOR;
1463 }
1464
1465 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1466 struct sk_buff *skb)
1467 {
1468 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1469 struct ieee80211_rx_status *rx_status;
1470 struct ieee80211_mgmt *mgmt;
1471 enum rx_mgmt_action rma = RX_MGMT_NONE;
1472 u16 fc;
1473
1474 rx_status = (struct ieee80211_rx_status *) skb->cb;
1475 mgmt = (struct ieee80211_mgmt *) skb->data;
1476 fc = le16_to_cpu(mgmt->frame_control);
1477
1478 mutex_lock(&ifmgd->mtx);
1479
1480 if (ifmgd->associated &&
1481 memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1482 switch (fc & IEEE80211_FCTL_STYPE) {
1483 case IEEE80211_STYPE_BEACON:
1484 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1485 rx_status);
1486 break;
1487 case IEEE80211_STYPE_PROBE_RESP:
1488 ieee80211_rx_mgmt_probe_resp(sdata, skb);
1489 break;
1490 case IEEE80211_STYPE_DEAUTH:
1491 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1492 break;
1493 case IEEE80211_STYPE_DISASSOC:
1494 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1495 break;
1496 case IEEE80211_STYPE_ACTION:
1497 if (mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
1498 break;
1499
1500 ieee80211_sta_process_chanswitch(sdata,
1501 &mgmt->u.action.u.chan_switch.sw_elem,
1502 (void *)ifmgd->associated->priv);
1503 break;
1504 }
1505 mutex_unlock(&ifmgd->mtx);
1506
1507 switch (rma) {
1508 case RX_MGMT_NONE:
1509 /* no action */
1510 break;
1511 case RX_MGMT_CFG80211_DEAUTH:
1512 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1513 break;
1514 case RX_MGMT_CFG80211_DISASSOC:
1515 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1516 break;
1517 default:
1518 WARN(1, "unexpected: %d", rma);
1519 }
1520 goto out;
1521 }
1522
1523 mutex_unlock(&ifmgd->mtx);
1524
1525 if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1526 (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH)
1527 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1528
1529 out:
1530 kfree_skb(skb);
1531 }
1532
1533 static void ieee80211_sta_timer(unsigned long data)
1534 {
1535 struct ieee80211_sub_if_data *sdata =
1536 (struct ieee80211_sub_if_data *) data;
1537 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1538 struct ieee80211_local *local = sdata->local;
1539
1540 if (local->quiescing) {
1541 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1542 return;
1543 }
1544
1545 ieee80211_queue_work(&local->hw, &ifmgd->work);
1546 }
1547
1548 static void ieee80211_sta_work(struct work_struct *work)
1549 {
1550 struct ieee80211_sub_if_data *sdata =
1551 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1552 struct ieee80211_local *local = sdata->local;
1553 struct ieee80211_if_managed *ifmgd;
1554 struct sk_buff *skb;
1555
1556 if (!ieee80211_sdata_running(sdata))
1557 return;
1558
1559 if (local->scanning)
1560 return;
1561
1562 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1563 return;
1564
1565 /*
1566 * ieee80211_queue_work() should have picked up most cases,
1567 * here we'll pick the the rest.
1568 */
1569 if (WARN(local->suspended, "STA MLME work scheduled while "
1570 "going to suspend\n"))
1571 return;
1572
1573 ifmgd = &sdata->u.mgd;
1574
1575 /* first process frames to avoid timing out while a frame is pending */
1576 while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1577 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1578
1579 /* then process the rest of the work */
1580 mutex_lock(&ifmgd->mtx);
1581
1582 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1583 IEEE80211_STA_CONNECTION_POLL) &&
1584 ifmgd->associated) {
1585 u8 bssid[ETH_ALEN];
1586
1587 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1588 if (time_is_after_jiffies(ifmgd->probe_timeout))
1589 run_again(ifmgd, ifmgd->probe_timeout);
1590
1591 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1592 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1593 printk(KERN_DEBUG "No probe response from AP %pM"
1594 " after %dms, try %d\n", bssid,
1595 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1596 ifmgd->probe_send_count);
1597 #endif
1598 ieee80211_mgd_probe_ap_send(sdata);
1599 } else {
1600 /*
1601 * We actually lost the connection ... or did we?
1602 * Let's make sure!
1603 */
1604 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1605 IEEE80211_STA_BEACON_POLL);
1606 printk(KERN_DEBUG "No probe response from AP %pM"
1607 " after %dms, disconnecting.\n",
1608 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1609 ieee80211_set_disassoc(sdata);
1610 ieee80211_recalc_idle(local);
1611 mutex_unlock(&ifmgd->mtx);
1612 /*
1613 * must be outside lock due to cfg80211,
1614 * but that's not a problem.
1615 */
1616 ieee80211_send_deauth_disassoc(sdata, bssid,
1617 IEEE80211_STYPE_DEAUTH,
1618 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1619 NULL);
1620 mutex_lock(&ifmgd->mtx);
1621 }
1622 }
1623
1624 mutex_unlock(&ifmgd->mtx);
1625 }
1626
1627 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1628 {
1629 struct ieee80211_sub_if_data *sdata =
1630 (struct ieee80211_sub_if_data *) data;
1631 struct ieee80211_local *local = sdata->local;
1632
1633 if (local->quiescing)
1634 return;
1635
1636 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
1637 }
1638
1639 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1640 {
1641 struct ieee80211_sub_if_data *sdata =
1642 (struct ieee80211_sub_if_data *) data;
1643 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1644 struct ieee80211_local *local = sdata->local;
1645
1646 if (local->quiescing)
1647 return;
1648
1649 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1650 }
1651
1652 static void ieee80211_sta_monitor_work(struct work_struct *work)
1653 {
1654 struct ieee80211_sub_if_data *sdata =
1655 container_of(work, struct ieee80211_sub_if_data,
1656 u.mgd.monitor_work);
1657
1658 ieee80211_mgd_probe_ap(sdata, false);
1659 }
1660
1661 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1662 {
1663 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1664 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1665 IEEE80211_STA_CONNECTION_POLL);
1666
1667 /* let's probe the connection once */
1668 ieee80211_queue_work(&sdata->local->hw,
1669 &sdata->u.mgd.monitor_work);
1670 /* and do all the other regular work too */
1671 ieee80211_queue_work(&sdata->local->hw,
1672 &sdata->u.mgd.work);
1673 }
1674 }
1675
1676 #ifdef CONFIG_PM
1677 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1678 {
1679 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1680
1681 /*
1682 * we need to use atomic bitops for the running bits
1683 * only because both timers might fire at the same
1684 * time -- the code here is properly synchronised.
1685 */
1686
1687 cancel_work_sync(&ifmgd->work);
1688 cancel_work_sync(&ifmgd->beacon_loss_work);
1689 if (del_timer_sync(&ifmgd->timer))
1690 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1691
1692 cancel_work_sync(&ifmgd->chswitch_work);
1693 if (del_timer_sync(&ifmgd->chswitch_timer))
1694 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1695
1696 cancel_work_sync(&ifmgd->monitor_work);
1697 /* these will just be re-established on connection */
1698 del_timer_sync(&ifmgd->conn_mon_timer);
1699 del_timer_sync(&ifmgd->bcn_mon_timer);
1700 }
1701
1702 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1703 {
1704 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1705
1706 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1707 add_timer(&ifmgd->timer);
1708 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1709 add_timer(&ifmgd->chswitch_timer);
1710 }
1711 #endif
1712
1713 /* interface setup */
1714 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1715 {
1716 struct ieee80211_if_managed *ifmgd;
1717
1718 ifmgd = &sdata->u.mgd;
1719 INIT_WORK(&ifmgd->work, ieee80211_sta_work);
1720 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1721 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1722 INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
1723 setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1724 (unsigned long) sdata);
1725 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1726 (unsigned long) sdata);
1727 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1728 (unsigned long) sdata);
1729 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1730 (unsigned long) sdata);
1731 skb_queue_head_init(&ifmgd->skb_queue);
1732
1733 ifmgd->flags = 0;
1734
1735 mutex_init(&ifmgd->mtx);
1736
1737 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1738 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1739 else
1740 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1741 }
1742
1743 /* scan finished notification */
1744 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1745 {
1746 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1747
1748 /* Restart STA timers */
1749 rcu_read_lock();
1750 list_for_each_entry_rcu(sdata, &local->interfaces, list)
1751 ieee80211_restart_sta_timer(sdata);
1752 rcu_read_unlock();
1753 }
1754
1755 int ieee80211_max_network_latency(struct notifier_block *nb,
1756 unsigned long data, void *dummy)
1757 {
1758 s32 latency_usec = (s32) data;
1759 struct ieee80211_local *local =
1760 container_of(nb, struct ieee80211_local,
1761 network_latency_notifier);
1762
1763 mutex_lock(&local->iflist_mtx);
1764 ieee80211_recalc_ps(local, latency_usec);
1765 mutex_unlock(&local->iflist_mtx);
1766
1767 return 0;
1768 }
1769
1770 /* config hooks */
1771 static enum work_done_result
1772 ieee80211_probe_auth_done(struct ieee80211_work *wk,
1773 struct sk_buff *skb)
1774 {
1775 if (!skb) {
1776 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
1777 return WORK_DONE_DESTROY;
1778 }
1779
1780 if (wk->type == IEEE80211_WORK_AUTH) {
1781 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
1782 return WORK_DONE_DESTROY;
1783 }
1784
1785 mutex_lock(&wk->sdata->u.mgd.mtx);
1786 ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
1787 mutex_unlock(&wk->sdata->u.mgd.mtx);
1788
1789 wk->type = IEEE80211_WORK_AUTH;
1790 wk->probe_auth.tries = 0;
1791 return WORK_DONE_REQUEUE;
1792 }
1793
1794 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
1795 struct cfg80211_auth_request *req)
1796 {
1797 const u8 *ssid;
1798 struct ieee80211_work *wk;
1799 u16 auth_alg;
1800
1801 switch (req->auth_type) {
1802 case NL80211_AUTHTYPE_OPEN_SYSTEM:
1803 auth_alg = WLAN_AUTH_OPEN;
1804 break;
1805 case NL80211_AUTHTYPE_SHARED_KEY:
1806 auth_alg = WLAN_AUTH_SHARED_KEY;
1807 break;
1808 case NL80211_AUTHTYPE_FT:
1809 auth_alg = WLAN_AUTH_FT;
1810 break;
1811 case NL80211_AUTHTYPE_NETWORK_EAP:
1812 auth_alg = WLAN_AUTH_LEAP;
1813 break;
1814 default:
1815 return -EOPNOTSUPP;
1816 }
1817
1818 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1819 if (!wk)
1820 return -ENOMEM;
1821
1822 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1823
1824 if (req->ie && req->ie_len) {
1825 memcpy(wk->ie, req->ie, req->ie_len);
1826 wk->ie_len = req->ie_len;
1827 }
1828
1829 if (req->key && req->key_len) {
1830 wk->probe_auth.key_len = req->key_len;
1831 wk->probe_auth.key_idx = req->key_idx;
1832 memcpy(wk->probe_auth.key, req->key, req->key_len);
1833 }
1834
1835 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1836 memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
1837 wk->probe_auth.ssid_len = ssid[1];
1838
1839 wk->probe_auth.algorithm = auth_alg;
1840 wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
1841
1842 /* if we already have a probe, don't probe again */
1843 if (req->bss->proberesp_ies)
1844 wk->type = IEEE80211_WORK_AUTH;
1845 else
1846 wk->type = IEEE80211_WORK_DIRECT_PROBE;
1847 wk->chan = req->bss->channel;
1848 wk->sdata = sdata;
1849 wk->done = ieee80211_probe_auth_done;
1850
1851 ieee80211_add_work(wk);
1852 return 0;
1853 }
1854
1855 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
1856 struct sk_buff *skb)
1857 {
1858 struct ieee80211_mgmt *mgmt;
1859 u16 status;
1860
1861 if (!skb) {
1862 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
1863 return WORK_DONE_DESTROY;
1864 }
1865
1866 mgmt = (void *)skb->data;
1867 status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1868
1869 if (status == WLAN_STATUS_SUCCESS) {
1870 mutex_lock(&wk->sdata->u.mgd.mtx);
1871 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
1872 mutex_unlock(&wk->sdata->u.mgd.mtx);
1873 /* oops -- internal error -- send timeout for now */
1874 cfg80211_send_assoc_timeout(wk->sdata->dev,
1875 wk->filter_ta);
1876 return WORK_DONE_DESTROY;
1877 }
1878 mutex_unlock(&wk->sdata->u.mgd.mtx);
1879 }
1880
1881 cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
1882 return WORK_DONE_DESTROY;
1883 }
1884
1885 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
1886 struct cfg80211_assoc_request *req)
1887 {
1888 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1889 struct ieee80211_bss *bss = (void *)req->bss->priv;
1890 struct ieee80211_work *wk;
1891 const u8 *ssid;
1892 int i;
1893
1894 mutex_lock(&ifmgd->mtx);
1895 if (ifmgd->associated) {
1896 mutex_unlock(&ifmgd->mtx);
1897 return -EALREADY;
1898 }
1899 mutex_unlock(&ifmgd->mtx);
1900
1901 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1902 if (!wk)
1903 return -ENOMEM;
1904
1905 ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
1906 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1907
1908 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
1909 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
1910 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
1911 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
1912 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
1913
1914
1915 if (req->ie && req->ie_len) {
1916 memcpy(wk->ie, req->ie, req->ie_len);
1917 wk->ie_len = req->ie_len;
1918 } else
1919 wk->ie_len = 0;
1920
1921 wk->assoc.bss = req->bss;
1922
1923 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1924
1925 /* new association always uses requested smps mode */
1926 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
1927 if (ifmgd->powersave)
1928 ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
1929 else
1930 ifmgd->ap_smps = IEEE80211_SMPS_OFF;
1931 } else
1932 ifmgd->ap_smps = ifmgd->req_smps;
1933
1934 wk->assoc.smps = ifmgd->ap_smps;
1935 /*
1936 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
1937 * We still associate in non-HT mode (11a/b/g) if any one of these
1938 * ciphers is configured as pairwise.
1939 * We can set this to true for non-11n hardware, that'll be checked
1940 * separately along with the peer capabilities.
1941 */
1942 wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
1943 wk->assoc.capability = req->bss->capability;
1944 wk->assoc.wmm_used = bss->wmm_used;
1945 wk->assoc.supp_rates = bss->supp_rates;
1946 wk->assoc.supp_rates_len = bss->supp_rates_len;
1947 wk->assoc.ht_information_ie =
1948 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
1949
1950 if (bss->wmm_used && bss->uapsd_supported &&
1951 (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
1952 wk->assoc.uapsd_used = true;
1953 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
1954 } else {
1955 wk->assoc.uapsd_used = false;
1956 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
1957 }
1958
1959 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1960 memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
1961 wk->assoc.ssid_len = ssid[1];
1962
1963 if (req->prev_bssid)
1964 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
1965
1966 wk->type = IEEE80211_WORK_ASSOC;
1967 wk->chan = req->bss->channel;
1968 wk->sdata = sdata;
1969 wk->done = ieee80211_assoc_done;
1970
1971 if (req->use_mfp) {
1972 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
1973 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
1974 } else {
1975 ifmgd->mfp = IEEE80211_MFP_DISABLED;
1976 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
1977 }
1978
1979 if (req->crypto.control_port)
1980 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
1981 else
1982 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
1983
1984 ieee80211_add_work(wk);
1985 return 0;
1986 }
1987
1988 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
1989 struct cfg80211_deauth_request *req,
1990 void *cookie)
1991 {
1992 struct ieee80211_local *local = sdata->local;
1993 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1994 struct ieee80211_work *wk;
1995 const u8 *bssid = req->bss->bssid;
1996
1997 mutex_lock(&ifmgd->mtx);
1998
1999 if (ifmgd->associated == req->bss) {
2000 bssid = req->bss->bssid;
2001 ieee80211_set_disassoc(sdata);
2002 mutex_unlock(&ifmgd->mtx);
2003 } else {
2004 bool not_auth_yet = false;
2005
2006 mutex_unlock(&ifmgd->mtx);
2007
2008 mutex_lock(&local->work_mtx);
2009 list_for_each_entry(wk, &local->work_list, list) {
2010 if (wk->sdata != sdata)
2011 continue;
2012
2013 if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2014 wk->type != IEEE80211_WORK_AUTH)
2015 continue;
2016
2017 if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2018 continue;
2019
2020 not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2021 list_del_rcu(&wk->list);
2022 free_work(wk);
2023 break;
2024 }
2025 mutex_unlock(&local->work_mtx);
2026
2027 /*
2028 * If somebody requests authentication and we haven't
2029 * sent out an auth frame yet there's no need to send
2030 * out a deauth frame either. If the state was PROBE,
2031 * then this is the case. If it's AUTH we have sent a
2032 * frame, and if it's IDLE we have completed the auth
2033 * process already.
2034 */
2035 if (not_auth_yet) {
2036 __cfg80211_auth_canceled(sdata->dev, bssid);
2037 return 0;
2038 }
2039 }
2040
2041 printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2042 sdata->name, bssid, req->reason_code);
2043
2044 ieee80211_send_deauth_disassoc(sdata, bssid,
2045 IEEE80211_STYPE_DEAUTH, req->reason_code,
2046 cookie);
2047
2048 ieee80211_recalc_idle(sdata->local);
2049
2050 return 0;
2051 }
2052
2053 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2054 struct cfg80211_disassoc_request *req,
2055 void *cookie)
2056 {
2057 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2058
2059 mutex_lock(&ifmgd->mtx);
2060
2061 /*
2062 * cfg80211 should catch this ... but it's racy since
2063 * we can receive a disassoc frame, process it, hand it
2064 * to cfg80211 while that's in a locked section already
2065 * trying to tell us that the user wants to disconnect.
2066 */
2067 if (ifmgd->associated != req->bss) {
2068 mutex_unlock(&ifmgd->mtx);
2069 return -ENOLINK;
2070 }
2071
2072 printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2073 sdata->name, req->bss->bssid, req->reason_code);
2074
2075 ieee80211_set_disassoc(sdata);
2076
2077 mutex_unlock(&ifmgd->mtx);
2078
2079 ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2080 IEEE80211_STYPE_DISASSOC, req->reason_code,
2081 cookie);
2082
2083 ieee80211_recalc_idle(sdata->local);
2084
2085 return 0;
2086 }
Linux kernel - Deliverables
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