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