?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / mac80211 / mlme.c
blob34e0650e9ef8f4ab38f618e981f03e3f189b0be9
1 /*
2 * BSS client mode implementation
3 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4 * Copyright 2004, Instant802 Networks, Inc.
5 * Copyright 2005, Devicescape Software, Inc.
6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14 #include <linux/delay.h>
15 #include <linux/if_ether.h>
16 #include <linux/skbuff.h>
17 #include <linux/if_arp.h>
18 #include <linux/etherdevice.h>
19 #include <linux/rtnetlink.h>
20 #include <linux/pm_qos_params.h>
21 #include <linux/crc32.h>
22 #include <net/mac80211.h>
23 #include <asm/unaligned.h>
24
25 #include "ieee80211_i.h"
26 #include "driver-ops.h"
27 #include "rate.h"
28 #include "led.h"
29
30 #define IEEE80211_MAX_PROBE_TRIES 5
31
32 /*
33 * beacon loss detection timeout
34 * XXX: should depend on beacon interval
35 */
36 #define IEEE80211_BEACON_LOSS_TIME (2 * HZ)
37 /*
38 * Time the connection can be idle before we probe
39 * it to see if we can still talk to the AP.
40 */
41 #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ)
42 /*
43 * Time we wait for a probe response after sending
44 * a probe request because of beacon loss or for
45 * checking the connection still works.
46 */
47 #define IEEE80211_PROBE_WAIT (HZ / 2)
48
49 #define TMR_RUNNING_TIMER 0
50 #define TMR_RUNNING_CHANSW 1
51
52 /*
53 * All cfg80211 functions have to be called outside a locked
54 * section so that they can acquire a lock themselves... This
55 * is much simpler than queuing up things in cfg80211, but we
56 * do need some indirection for that here.
57 */
58 enum rx_mgmt_action {
59 /* no action required */
60 RX_MGMT_NONE,
61
62 /* caller must call cfg80211_send_rx_auth() */
63 RX_MGMT_CFG80211_AUTH,
64
65 /* caller must call cfg80211_send_rx_assoc() */
66 RX_MGMT_CFG80211_ASSOC,
67
68 /* caller must call cfg80211_send_deauth() */
69 RX_MGMT_CFG80211_DEAUTH,
70
71 /* caller must call cfg80211_send_disassoc() */
72 RX_MGMT_CFG80211_DISASSOC,
73
74 /* caller must tell cfg80211 about internal error */
75 RX_MGMT_CFG80211_ASSOC_ERROR,
76 };
77
78 /* utils */
79 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
80 {
81 WARN_ON(!mutex_is_locked(&ifmgd->mtx));
82 }
83
84 /*
85 * We can have multiple work items (and connection probing)
86 * scheduling this timer, but we need to take care to only
87 * reschedule it when it should fire _earlier_ than it was
88 * asked for before, or if it's not pending right now. This
89 * function ensures that. Note that it then is required to
90 * run this function for all timeouts after the first one
91 * has happened -- the work that runs from this timer will
92 * do that.
93 */
94 static void run_again(struct ieee80211_if_managed *ifmgd,
95 unsigned long timeout)
96 {
97 ASSERT_MGD_MTX(ifmgd);
98
99 if (!timer_pending(&ifmgd->timer) ||
100 time_before(timeout, ifmgd->timer.expires))
101 mod_timer(&ifmgd->timer, timeout);
102 }
103
104 static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata)
105 {
106 if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
107 return;
108
109 mod_timer(&sdata->u.mgd.bcn_mon_timer,
110 round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME));
111 }
112
113 static int ecw2cw(int ecw)
114 {
115 return (1 << ecw) - 1;
116 }
117
118 /*
119 * ieee80211_enable_ht should be called only after the operating band
120 * has been determined as ht configuration depends on the hw's
121 * HT abilities for a specific band.
122 */
123 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
124 struct ieee80211_ht_info *hti,
125 const u8 *bssid, u16 ap_ht_cap_flags)
126 {
127 struct ieee80211_local *local = sdata->local;
128 struct ieee80211_supported_band *sband;
129 struct sta_info *sta;
130 u32 changed = 0;
131 u16 ht_opmode;
132 bool enable_ht = true, ht_changed;
133 enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
134
135 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
136
137 /* HT is not supported */
138 if (!sband->ht_cap.ht_supported)
139 enable_ht = false;
140
141 /* check that channel matches the right operating channel */
142 if (local->hw.conf.channel->center_freq !=
143 ieee80211_channel_to_frequency(hti->control_chan))
144 enable_ht = false;
145
146 if (enable_ht) {
147 channel_type = NL80211_CHAN_HT20;
148
149 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
150 (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
151 (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
152 switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
153 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
154 if (!(local->hw.conf.channel->flags &
155 IEEE80211_CHAN_NO_HT40PLUS))
156 channel_type = NL80211_CHAN_HT40PLUS;
157 break;
158 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
159 if (!(local->hw.conf.channel->flags &
160 IEEE80211_CHAN_NO_HT40MINUS))
161 channel_type = NL80211_CHAN_HT40MINUS;
162 break;
163 }
164 }
165 }
166
167 ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
168 channel_type != local->hw.conf.channel_type;
169
170 local->oper_channel_type = channel_type;
171
172 if (ht_changed) {
173 /* channel_type change automatically detected */
174 ieee80211_hw_config(local, 0);
175
176 rcu_read_lock();
177 sta = sta_info_get(sdata, bssid);
178 if (sta)
179 rate_control_rate_update(local, sband, sta,
180 IEEE80211_RC_HT_CHANGED,
181 local->oper_channel_type);
182 rcu_read_unlock();
183 }
184
185 /* disable HT */
186 if (!enable_ht)
187 return 0;
188
189 ht_opmode = le16_to_cpu(hti->operation_mode);
190
191 /* if bss configuration changed store the new one */
192 if (!sdata->ht_opmode_valid ||
193 sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
194 changed |= BSS_CHANGED_HT;
195 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
196 sdata->ht_opmode_valid = true;
197 }
198
199 return changed;
200 }
201
202 /* frame sending functions */
203
204 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
205 const u8 *bssid, u16 stype, u16 reason,
206 void *cookie)
207 {
208 struct ieee80211_local *local = sdata->local;
209 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
210 struct sk_buff *skb;
211 struct ieee80211_mgmt *mgmt;
212
213 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
214 if (!skb) {
215 printk(KERN_DEBUG "%s: failed to allocate buffer for "
216 "deauth/disassoc frame\n", sdata->name);
217 return;
218 }
219 skb_reserve(skb, local->hw.extra_tx_headroom);
220
221 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
222 memset(mgmt, 0, 24);
223 memcpy(mgmt->da, bssid, ETH_ALEN);
224 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
225 memcpy(mgmt->bssid, bssid, ETH_ALEN);
226 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
227 skb_put(skb, 2);
228 /* u.deauth.reason_code == u.disassoc.reason_code */
229 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
230
231 if (stype == IEEE80211_STYPE_DEAUTH)
232 if (cookie)
233 __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
234 else
235 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
236 else
237 if (cookie)
238 __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
239 else
240 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
241 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
242 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
243 ieee80211_tx_skb(sdata, skb);
244 }
245
246 void ieee80211_send_pspoll(struct ieee80211_local *local,
247 struct ieee80211_sub_if_data *sdata)
248 {
249 struct ieee80211_pspoll *pspoll;
250 struct sk_buff *skb;
251
252 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
253 if (!skb)
254 return;
255
256 pspoll = (struct ieee80211_pspoll *) skb->data;
257 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
258
259 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
260 ieee80211_tx_skb(sdata, skb);
261 }
262
263 void ieee80211_send_nullfunc(struct ieee80211_local *local,
264 struct ieee80211_sub_if_data *sdata,
265 int powersave)
266 {
267 struct sk_buff *skb;
268 struct ieee80211_hdr_3addr *nullfunc;
269
270 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
271 if (!skb)
272 return;
273
274 nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
275 if (powersave)
276 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
277
278 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
279 ieee80211_tx_skb(sdata, skb);
280 }
281
282 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
283 struct ieee80211_sub_if_data *sdata)
284 {
285 struct sk_buff *skb;
286 struct ieee80211_hdr *nullfunc;
287 __le16 fc;
288
289 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
290 return;
291
292 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
293 if (!skb) {
294 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
295 "nullfunc frame\n", sdata->name);
296 return;
297 }
298 skb_reserve(skb, local->hw.extra_tx_headroom);
299
300 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
301 memset(nullfunc, 0, 30);
302 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
303 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
304 nullfunc->frame_control = fc;
305 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
306 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
307 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
308 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
309
310 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
311 ieee80211_tx_skb(sdata, skb);
312 }
313
314 /* spectrum management related things */
315 static void ieee80211_chswitch_work(struct work_struct *work)
316 {
317 struct ieee80211_sub_if_data *sdata =
318 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
319 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
320
321 if (!ieee80211_sdata_running(sdata))
322 return;
323
324 mutex_lock(&ifmgd->mtx);
325 if (!ifmgd->associated)
326 goto out;
327
328 sdata->local->oper_channel = sdata->local->csa_channel;
329 ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL);
330
331 /* XXX: shouldn't really modify cfg80211-owned data! */
332 ifmgd->associated->channel = sdata->local->oper_channel;
333
334 ieee80211_wake_queues_by_reason(&sdata->local->hw,
335 IEEE80211_QUEUE_STOP_REASON_CSA);
336 out:
337 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
338 mutex_unlock(&ifmgd->mtx);
339 }
340
341 static void ieee80211_chswitch_timer(unsigned long data)
342 {
343 struct ieee80211_sub_if_data *sdata =
344 (struct ieee80211_sub_if_data *) data;
345 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
346
347 if (sdata->local->quiescing) {
348 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
349 return;
350 }
351
352 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
353 }
354
355 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
356 struct ieee80211_channel_sw_ie *sw_elem,
357 struct ieee80211_bss *bss)
358 {
359 struct cfg80211_bss *cbss =
360 container_of((void *)bss, struct cfg80211_bss, priv);
361 struct ieee80211_channel *new_ch;
362 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
363 int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
364
365 ASSERT_MGD_MTX(ifmgd);
366
367 if (!ifmgd->associated)
368 return;
369
370 if (sdata->local->scanning)
371 return;
372
373 /* Disregard subsequent beacons if we are already running a timer
374 processing a CSA */
375
376 if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
377 return;
378
379 new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
380 if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
381 return;
382
383 sdata->local->csa_channel = new_ch;
384
385 if (sw_elem->count <= 1) {
386 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
387 } else {
388 ieee80211_stop_queues_by_reason(&sdata->local->hw,
389 IEEE80211_QUEUE_STOP_REASON_CSA);
390 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
391 mod_timer(&ifmgd->chswitch_timer,
392 jiffies +
393 msecs_to_jiffies(sw_elem->count *
394 cbss->beacon_interval));
395 }
396 }
397
398 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
399 u16 capab_info, u8 *pwr_constr_elem,
400 u8 pwr_constr_elem_len)
401 {
402 struct ieee80211_conf *conf = &sdata->local->hw.conf;
403
404 if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
405 return;
406
407 /* Power constraint IE length should be 1 octet */
408 if (pwr_constr_elem_len != 1)
409 return;
410
411 if ((*pwr_constr_elem <= conf->channel->max_power) &&
412 (*pwr_constr_elem != sdata->local->power_constr_level)) {
413 sdata->local->power_constr_level = *pwr_constr_elem;
414 ieee80211_hw_config(sdata->local, 0);
415 }
416 }
417
418 /* powersave */
419 static void ieee80211_enable_ps(struct ieee80211_local *local,
420 struct ieee80211_sub_if_data *sdata)
421 {
422 struct ieee80211_conf *conf = &local->hw.conf;
423
424 /*
425 * If we are scanning right now then the parameters will
426 * take effect when scan finishes.
427 */
428 if (local->scanning)
429 return;
430
431 if (conf->dynamic_ps_timeout > 0 &&
432 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
433 mod_timer(&local->dynamic_ps_timer, jiffies +
434 msecs_to_jiffies(conf->dynamic_ps_timeout));
435 } else {
436 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
437 ieee80211_send_nullfunc(local, sdata, 1);
438
439 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
440 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
441 return;
442
443 conf->flags |= IEEE80211_CONF_PS;
444 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
445 }
446 }
447
448 static void ieee80211_change_ps(struct ieee80211_local *local)
449 {
450 struct ieee80211_conf *conf = &local->hw.conf;
451
452 if (local->ps_sdata) {
453 ieee80211_enable_ps(local, local->ps_sdata);
454 } else if (conf->flags & IEEE80211_CONF_PS) {
455 conf->flags &= ~IEEE80211_CONF_PS;
456 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
457 del_timer_sync(&local->dynamic_ps_timer);
458 cancel_work_sync(&local->dynamic_ps_enable_work);
459 }
460 }
461
462 /* need to hold RTNL or interface lock */
463 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
464 {
465 struct ieee80211_sub_if_data *sdata, *found = NULL;
466 int count = 0;
467
468 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
469 local->ps_sdata = NULL;
470 return;
471 }
472
473 if (!list_empty(&local->work_list)) {
474 local->ps_sdata = NULL;
475 goto change;
476 }
477
478 list_for_each_entry(sdata, &local->interfaces, list) {
479 if (!ieee80211_sdata_running(sdata))
480 continue;
481 if (sdata->vif.type != NL80211_IFTYPE_STATION)
482 continue;
483 found = sdata;
484 count++;
485 }
486
487 if (count == 1 && found->u.mgd.powersave &&
488 found->u.mgd.associated &&
489 found->u.mgd.associated->beacon_ies &&
490 !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
491 IEEE80211_STA_CONNECTION_POLL))) {
492 s32 beaconint_us;
493
494 if (latency < 0)
495 latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
496
497 beaconint_us = ieee80211_tu_to_usec(
498 found->vif.bss_conf.beacon_int);
499
500 if (beaconint_us > latency) {
501 local->ps_sdata = NULL;
502 } else {
503 struct ieee80211_bss *bss;
504 int maxslp = 1;
505 u8 dtimper;
506
507 bss = (void *)found->u.mgd.associated->priv;
508 dtimper = bss->dtim_period;
509
510 /* If the TIM IE is invalid, pretend the value is 1 */
511 if (!dtimper)
512 dtimper = 1;
513 else if (dtimper > 1)
514 maxslp = min_t(int, dtimper,
515 latency / beaconint_us);
516
517 local->hw.conf.max_sleep_period = maxslp;
518 local->hw.conf.ps_dtim_period = dtimper;
519 local->ps_sdata = found;
520 }
521 } else {
522 local->ps_sdata = NULL;
523 }
524
525 change:
526 ieee80211_change_ps(local);
527 }
528
529 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
530 {
531 struct ieee80211_local *local =
532 container_of(work, struct ieee80211_local,
533 dynamic_ps_disable_work);
534
535 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
536 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
537 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
538 }
539
540 ieee80211_wake_queues_by_reason(&local->hw,
541 IEEE80211_QUEUE_STOP_REASON_PS);
542 }
543
544 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
545 {
546 struct ieee80211_local *local =
547 container_of(work, struct ieee80211_local,
548 dynamic_ps_enable_work);
549 struct ieee80211_sub_if_data *sdata = local->ps_sdata;
550 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
551
552 /* can only happen when PS was just disabled anyway */
553 if (!sdata)
554 return;
555
556 if (local->hw.conf.flags & IEEE80211_CONF_PS)
557 return;
558
559 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
560 (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
561 ieee80211_send_nullfunc(local, sdata, 1);
562
563 if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
564 (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
565 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
566 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
567 local->hw.conf.flags |= IEEE80211_CONF_PS;
568 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
569 }
570 }
571
572 void ieee80211_dynamic_ps_timer(unsigned long data)
573 {
574 struct ieee80211_local *local = (void *) data;
575
576 if (local->quiescing || local->suspended)
577 return;
578
579 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
580 }
581
582 /* MLME */
583 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
584 struct ieee80211_if_managed *ifmgd,
585 u8 *wmm_param, size_t wmm_param_len)
586 {
587 struct ieee80211_tx_queue_params params;
588 size_t left;
589 int count;
590 u8 *pos, uapsd_queues = 0;
591
592 if (local->hw.queues < 4)
593 return;
594
595 if (!wmm_param)
596 return;
597
598 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
599 return;
600
601 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
602 uapsd_queues = local->uapsd_queues;
603
604 count = wmm_param[6] & 0x0f;
605 if (count == ifmgd->wmm_last_param_set)
606 return;
607 ifmgd->wmm_last_param_set = count;
608
609 pos = wmm_param + 8;
610 left = wmm_param_len - 8;
611
612 memset(&params, 0, sizeof(params));
613
614 local->wmm_acm = 0;
615 for (; left >= 4; left -= 4, pos += 4) {
616 int aci = (pos[0] >> 5) & 0x03;
617 int acm = (pos[0] >> 4) & 0x01;
618 bool uapsd = false;
619 int queue;
620
621 switch (aci) {
622 case 1: /* AC_BK */
623 queue = 3;
624 if (acm)
625 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
626 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
627 uapsd = true;
628 break;
629 case 2: /* AC_VI */
630 queue = 1;
631 if (acm)
632 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
633 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
634 uapsd = true;
635 break;
636 case 3: /* AC_VO */
637 queue = 0;
638 if (acm)
639 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
640 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
641 uapsd = true;
642 break;
643 case 0: /* AC_BE */
644 default:
645 queue = 2;
646 if (acm)
647 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
648 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
649 uapsd = true;
650 break;
651 }
652
653 params.aifs = pos[0] & 0x0f;
654 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
655 params.cw_min = ecw2cw(pos[1] & 0x0f);
656 params.txop = get_unaligned_le16(pos + 2);
657 params.uapsd = uapsd;
658
659 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
660 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
661 "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
662 wiphy_name(local->hw.wiphy), queue, aci, acm,
663 params.aifs, params.cw_min, params.cw_max, params.txop,
664 params.uapsd);
665 #endif
666 if (drv_conf_tx(local, queue, &params) && local->ops->conf_tx)
667 printk(KERN_DEBUG "%s: failed to set TX queue "
668 "parameters for queue %d\n",
669 wiphy_name(local->hw.wiphy), queue);
670 }
671 }
672
673 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
674 u16 capab, bool erp_valid, u8 erp)
675 {
676 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
677 u32 changed = 0;
678 bool use_protection;
679 bool use_short_preamble;
680 bool use_short_slot;
681
682 if (erp_valid) {
683 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
684 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
685 } else {
686 use_protection = false;
687 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
688 }
689
690 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
691 if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
692 use_short_slot = true;
693
694 if (use_protection != bss_conf->use_cts_prot) {
695 bss_conf->use_cts_prot = use_protection;
696 changed |= BSS_CHANGED_ERP_CTS_PROT;
697 }
698
699 if (use_short_preamble != bss_conf->use_short_preamble) {
700 bss_conf->use_short_preamble = use_short_preamble;
701 changed |= BSS_CHANGED_ERP_PREAMBLE;
702 }
703
704 if (use_short_slot != bss_conf->use_short_slot) {
705 bss_conf->use_short_slot = use_short_slot;
706 changed |= BSS_CHANGED_ERP_SLOT;
707 }
708
709 return changed;
710 }
711
712 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
713 struct cfg80211_bss *cbss,
714 u32 bss_info_changed)
715 {
716 struct ieee80211_bss *bss = (void *)cbss->priv;
717 struct ieee80211_local *local = sdata->local;
718
719 bss_info_changed |= BSS_CHANGED_ASSOC;
720 /* set timing information */
721 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
722 sdata->vif.bss_conf.timestamp = cbss->tsf;
723
724 bss_info_changed |= BSS_CHANGED_BEACON_INT;
725 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
726 cbss->capability, bss->has_erp_value, bss->erp_value);
727
728 sdata->u.mgd.associated = cbss;
729 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
730
731 /* just to be sure */
732 sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
733 IEEE80211_STA_BEACON_POLL);
734
735 /*
736 * Always handle WMM once after association regardless
737 * of the first value the AP uses. Setting -1 here has
738 * that effect because the AP values is an unsigned
739 * 4-bit value.
740 */
741 sdata->u.mgd.wmm_last_param_set = -1;
742
743 ieee80211_led_assoc(local, 1);
744
745 sdata->vif.bss_conf.assoc = 1;
746 /*
747 * For now just always ask the driver to update the basic rateset
748 * when we have associated, we aren't checking whether it actually
749 * changed or not.
750 */
751 bss_info_changed |= BSS_CHANGED_BASIC_RATES;
752
753 /* And the BSSID changed - we're associated now */
754 bss_info_changed |= BSS_CHANGED_BSSID;
755
756 /* Tell the driver to monitor connection quality (if supported) */
757 if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
758 sdata->vif.bss_conf.cqm_rssi_thold)
759 bss_info_changed |= BSS_CHANGED_CQM;
760
761 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
762
763 mutex_lock(&local->iflist_mtx);
764 ieee80211_recalc_ps(local, -1);
765 ieee80211_recalc_smps(local, sdata);
766 mutex_unlock(&local->iflist_mtx);
767
768 netif_tx_start_all_queues(sdata->dev);
769 netif_carrier_on(sdata->dev);
770 }
771
772 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata)
773 {
774 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
775 struct ieee80211_local *local = sdata->local;
776 struct sta_info *sta;
777 u32 changed = 0, config_changed = 0;
778 u8 bssid[ETH_ALEN];
779
780 ASSERT_MGD_MTX(ifmgd);
781
782 if (WARN_ON(!ifmgd->associated))
783 return;
784
785 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
786
787 ifmgd->associated = NULL;
788 memset(ifmgd->bssid, 0, ETH_ALEN);
789
790 /*
791 * we need to commit the associated = NULL change because the
792 * scan code uses that to determine whether this iface should
793 * go to/wake up from powersave or not -- and could otherwise
794 * wake the queues erroneously.
795 */
796 smp_mb();
797
798 /*
799 * Thus, we can only afterwards stop the queues -- to account
800 * for the case where another CPU is finishing a scan at this
801 * time -- we don't want the scan code to enable queues.
802 */
803
804 netif_tx_stop_all_queues(sdata->dev);
805 netif_carrier_off(sdata->dev);
806
807 rcu_read_lock();
808 sta = sta_info_get(sdata, bssid);
809 if (sta) {
810 set_sta_flags(sta, WLAN_STA_DISASSOC);
811 ieee80211_sta_tear_down_BA_sessions(sta);
812 }
813 rcu_read_unlock();
814
815 changed |= ieee80211_reset_erp_info(sdata);
816
817 ieee80211_led_assoc(local, 0);
818 changed |= BSS_CHANGED_ASSOC;
819 sdata->vif.bss_conf.assoc = false;
820
821 ieee80211_set_wmm_default(sdata);
822
823 /* channel(_type) changes are handled by ieee80211_hw_config */
824 local->oper_channel_type = NL80211_CHAN_NO_HT;
825
826 /* on the next assoc, re-program HT parameters */
827 sdata->ht_opmode_valid = false;
828
829 local->power_constr_level = 0;
830
831 del_timer_sync(&local->dynamic_ps_timer);
832 cancel_work_sync(&local->dynamic_ps_enable_work);
833
834 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
835 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
836 config_changed |= IEEE80211_CONF_CHANGE_PS;
837 }
838
839 ieee80211_hw_config(local, config_changed);
840
841 /* And the BSSID changed -- not very interesting here */
842 changed |= BSS_CHANGED_BSSID;
843 ieee80211_bss_info_change_notify(sdata, changed);
844
845 sta_info_destroy_addr(sdata, bssid);
846 }
847
848 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
849 struct ieee80211_hdr *hdr)
850 {
851 /*
852 * We can postpone the mgd.timer whenever receiving unicast frames
853 * from AP because we know that the connection is working both ways
854 * at that time. But multicast frames (and hence also beacons) must
855 * be ignored here, because we need to trigger the timer during
856 * data idle periods for sending the periodic probe request to the
857 * AP we're connected to.
858 */
859 if (is_multicast_ether_addr(hdr->addr1))
860 return;
861
862 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
863 return;
864
865 mod_timer(&sdata->u.mgd.conn_mon_timer,
866 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
867 }
868
869 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
870 {
871 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
872 const u8 *ssid;
873
874 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
875 ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
876 ssid + 2, ssid[1], NULL, 0);
877
878 ifmgd->probe_send_count++;
879 ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
880 run_again(ifmgd, ifmgd->probe_timeout);
881 }
882
883 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
884 bool beacon)
885 {
886 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
887 bool already = false;
888
889 if (!ieee80211_sdata_running(sdata))
890 return;
891
892 if (sdata->local->scanning)
893 return;
894
895 if (sdata->local->tmp_channel)
896 return;
897
898 mutex_lock(&ifmgd->mtx);
899
900 if (!ifmgd->associated)
901 goto out;
902
903 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
904 if (beacon && net_ratelimit())
905 printk(KERN_DEBUG "%s: detected beacon loss from AP "
906 "- sending probe request\n", sdata->name);
907 #endif
908
909 /*
910 * The driver/our work has already reported this event or the
911 * connection monitoring has kicked in and we have already sent
912 * a probe request. Or maybe the AP died and the driver keeps
913 * reporting until we disassociate...
914 *
915 * In either case we have to ignore the current call to this
916 * function (except for setting the correct probe reason bit)
917 * because otherwise we would reset the timer every time and
918 * never check whether we received a probe response!
919 */
920 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
921 IEEE80211_STA_CONNECTION_POLL))
922 already = true;
923
924 if (beacon)
925 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
926 else
927 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
928
929 if (already)
930 goto out;
931
932 mutex_lock(&sdata->local->iflist_mtx);
933 ieee80211_recalc_ps(sdata->local, -1);
934 mutex_unlock(&sdata->local->iflist_mtx);
935
936 ifmgd->probe_send_count = 0;
937 ieee80211_mgd_probe_ap_send(sdata);
938 out:
939 mutex_unlock(&ifmgd->mtx);
940 }
941
942 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
943 {
944 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
945 struct ieee80211_local *local = sdata->local;
946 u8 bssid[ETH_ALEN];
947
948 mutex_lock(&ifmgd->mtx);
949 if (!ifmgd->associated) {
950 mutex_unlock(&ifmgd->mtx);
951 return;
952 }
953
954 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
955
956 printk(KERN_DEBUG "Connection to AP %pM lost.\n", bssid);
957
958 ieee80211_set_disassoc(sdata);
959 ieee80211_recalc_idle(local);
960 mutex_unlock(&ifmgd->mtx);
961 /*
962 * must be outside lock due to cfg80211,
963 * but that's not a problem.
964 */
965 ieee80211_send_deauth_disassoc(sdata, bssid,
966 IEEE80211_STYPE_DEAUTH,
967 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
968 NULL);
969 }
970
971 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
972 {
973 struct ieee80211_sub_if_data *sdata =
974 container_of(work, struct ieee80211_sub_if_data,
975 u.mgd.beacon_connection_loss_work);
976
977 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
978 __ieee80211_connection_loss(sdata);
979 else
980 ieee80211_mgd_probe_ap(sdata, true);
981 }
982
983 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
984 {
985 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
986 struct ieee80211_hw *hw = &sdata->local->hw;
987
988 WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
989 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
990 }
991 EXPORT_SYMBOL(ieee80211_beacon_loss);
992
993 void ieee80211_connection_loss(struct ieee80211_vif *vif)
994 {
995 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
996 struct ieee80211_hw *hw = &sdata->local->hw;
997
998 WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
999 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1000 }
1001 EXPORT_SYMBOL(ieee80211_connection_loss);
1002
1003
1004 static enum rx_mgmt_action __must_check
1005 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1006 struct ieee80211_mgmt *mgmt, size_t len)
1007 {
1008 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1009 const u8 *bssid = NULL;
1010 u16 reason_code;
1011
1012 if (len < 24 + 2)
1013 return RX_MGMT_NONE;
1014
1015 ASSERT_MGD_MTX(ifmgd);
1016
1017 bssid = ifmgd->associated->bssid;
1018
1019 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1020
1021 printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1022 sdata->name, bssid, reason_code);
1023
1024 ieee80211_set_disassoc(sdata);
1025 ieee80211_recalc_idle(sdata->local);
1026
1027 return RX_MGMT_CFG80211_DEAUTH;
1028 }
1029
1030
1031 static enum rx_mgmt_action __must_check
1032 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1033 struct ieee80211_mgmt *mgmt, size_t len)
1034 {
1035 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1036 u16 reason_code;
1037
1038 if (len < 24 + 2)
1039 return RX_MGMT_NONE;
1040
1041 ASSERT_MGD_MTX(ifmgd);
1042
1043 if (WARN_ON(!ifmgd->associated))
1044 return RX_MGMT_NONE;
1045
1046 if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1047 return RX_MGMT_NONE;
1048
1049 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1050
1051 printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1052 sdata->name, mgmt->sa, reason_code);
1053
1054 ieee80211_set_disassoc(sdata);
1055 ieee80211_recalc_idle(sdata->local);
1056 return RX_MGMT_CFG80211_DISASSOC;
1057 }
1058
1059
1060 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1061 struct ieee80211_mgmt *mgmt, size_t len)
1062 {
1063 struct ieee80211_sub_if_data *sdata = wk->sdata;
1064 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1065 struct ieee80211_local *local = sdata->local;
1066 struct ieee80211_supported_band *sband;
1067 struct sta_info *sta;
1068 struct cfg80211_bss *cbss = wk->assoc.bss;
1069 u8 *pos;
1070 u32 rates, basic_rates;
1071 u16 capab_info, aid;
1072 struct ieee802_11_elems elems;
1073 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1074 u32 changed = 0;
1075 int i, j, err;
1076 bool have_higher_than_11mbit = false;
1077 u16 ap_ht_cap_flags;
1078
1079 /* AssocResp and ReassocResp have identical structure */
1080
1081 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1082 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1083
1084 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1085 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1086 "set\n", sdata->name, aid);
1087 aid &= ~(BIT(15) | BIT(14));
1088
1089 pos = mgmt->u.assoc_resp.variable;
1090 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1091
1092 if (!elems.supp_rates) {
1093 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1094 sdata->name);
1095 return false;
1096 }
1097
1098 ifmgd->aid = aid;
1099
1100 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1101 if (!sta) {
1102 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1103 " the AP\n", sdata->name);
1104 return false;
1105 }
1106
1107 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1108 WLAN_STA_ASSOC_AP);
1109 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1110 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1111
1112 rates = 0;
1113 basic_rates = 0;
1114 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1115
1116 for (i = 0; i < elems.supp_rates_len; i++) {
1117 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1118 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1119
1120 if (rate > 110)
1121 have_higher_than_11mbit = true;
1122
1123 for (j = 0; j < sband->n_bitrates; j++) {
1124 if (sband->bitrates[j].bitrate == rate) {
1125 rates |= BIT(j);
1126 if (is_basic)
1127 basic_rates |= BIT(j);
1128 break;
1129 }
1130 }
1131 }
1132
1133 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1134 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1135 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1136
1137 if (rate > 110)
1138 have_higher_than_11mbit = true;
1139
1140 for (j = 0; j < sband->n_bitrates; j++) {
1141 if (sband->bitrates[j].bitrate == rate) {
1142 rates |= BIT(j);
1143 if (is_basic)
1144 basic_rates |= BIT(j);
1145 break;
1146 }
1147 }
1148 }
1149
1150 sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1151 sdata->vif.bss_conf.basic_rates = basic_rates;
1152
1153 /* cf. IEEE 802.11 9.2.12 */
1154 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1155 have_higher_than_11mbit)
1156 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1157 else
1158 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1159
1160 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1161 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1162 elems.ht_cap_elem, &sta->sta.ht_cap);
1163
1164 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1165
1166 rate_control_rate_init(sta);
1167
1168 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1169 set_sta_flags(sta, WLAN_STA_MFP);
1170
1171 if (elems.wmm_param)
1172 set_sta_flags(sta, WLAN_STA_WME);
1173
1174 err = sta_info_insert(sta);
1175 sta = NULL;
1176 if (err) {
1177 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1178 " the AP (error %d)\n", sdata->name, err);
1179 return false;
1180 }
1181
1182 if (elems.wmm_param)
1183 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1184 elems.wmm_param_len);
1185 else
1186 ieee80211_set_wmm_default(sdata);
1187
1188 local->oper_channel = wk->chan;
1189
1190 if (elems.ht_info_elem && elems.wmm_param &&
1191 (sdata->local->hw.queues >= 4) &&
1192 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1193 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1194 cbss->bssid, ap_ht_cap_flags);
1195
1196 /* set AID and assoc capability,
1197 * ieee80211_set_associated() will tell the driver */
1198 bss_conf->aid = aid;
1199 bss_conf->assoc_capability = capab_info;
1200 ieee80211_set_associated(sdata, cbss, changed);
1201
1202 /*
1203 * If we're using 4-addr mode, let the AP know that we're
1204 * doing so, so that it can create the STA VLAN on its side
1205 */
1206 if (ifmgd->use_4addr)
1207 ieee80211_send_4addr_nullfunc(local, sdata);
1208
1209 /*
1210 * Start timer to probe the connection to the AP now.
1211 * Also start the timer that will detect beacon loss.
1212 */
1213 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1214 mod_beacon_timer(sdata);
1215
1216 return true;
1217 }
1218
1219
1220 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1221 struct ieee80211_mgmt *mgmt,
1222 size_t len,
1223 struct ieee80211_rx_status *rx_status,
1224 struct ieee802_11_elems *elems,
1225 bool beacon)
1226 {
1227 struct ieee80211_local *local = sdata->local;
1228 int freq;
1229 struct ieee80211_bss *bss;
1230 struct ieee80211_channel *channel;
1231 bool need_ps = false;
1232
1233 if (sdata->u.mgd.associated) {
1234 bss = (void *)sdata->u.mgd.associated->priv;
1235 /* not previously set so we may need to recalc */
1236 need_ps = !bss->dtim_period;
1237 }
1238
1239 if (elems->ds_params && elems->ds_params_len == 1)
1240 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1241 else
1242 freq = rx_status->freq;
1243
1244 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1245
1246 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1247 return;
1248
1249 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1250 channel, beacon);
1251 if (bss)
1252 ieee80211_rx_bss_put(local, bss);
1253
1254 if (!sdata->u.mgd.associated)
1255 return;
1256
1257 if (need_ps) {
1258 mutex_lock(&local->iflist_mtx);
1259 ieee80211_recalc_ps(local, -1);
1260 mutex_unlock(&local->iflist_mtx);
1261 }
1262
1263 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1264 (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1265 ETH_ALEN) == 0)) {
1266 struct ieee80211_channel_sw_ie *sw_elem =
1267 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1268 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1269 }
1270 }
1271
1272
1273 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1274 struct sk_buff *skb)
1275 {
1276 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1277 struct ieee80211_if_managed *ifmgd;
1278 struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1279 size_t baselen, len = skb->len;
1280 struct ieee802_11_elems elems;
1281
1282 ifmgd = &sdata->u.mgd;
1283
1284 ASSERT_MGD_MTX(ifmgd);
1285
1286 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1287 return; /* ignore ProbeResp to foreign address */
1288
1289 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1290 if (baselen > len)
1291 return;
1292
1293 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1294 &elems);
1295
1296 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1297
1298 if (ifmgd->associated &&
1299 memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1300 ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1301 IEEE80211_STA_CONNECTION_POLL)) {
1302 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1303 IEEE80211_STA_BEACON_POLL);
1304 mutex_lock(&sdata->local->iflist_mtx);
1305 ieee80211_recalc_ps(sdata->local, -1);
1306 mutex_unlock(&sdata->local->iflist_mtx);
1307 /*
1308 * We've received a probe response, but are not sure whether
1309 * we have or will be receiving any beacons or data, so let's
1310 * schedule the timers again, just in case.
1311 */
1312 mod_beacon_timer(sdata);
1313 mod_timer(&ifmgd->conn_mon_timer,
1314 round_jiffies_up(jiffies +
1315 IEEE80211_CONNECTION_IDLE_TIME));
1316 }
1317 }
1318
1319 /*
1320 * This is the canonical list of information elements we care about,
1321 * the filter code also gives us all changes to the Microsoft OUI
1322 * (00:50:F2) vendor IE which is used for WMM which we need to track.
1323 *
1324 * We implement beacon filtering in software since that means we can
1325 * avoid processing the frame here and in cfg80211, and userspace
1326 * will not be able to tell whether the hardware supports it or not.
1327 *
1328 * XXX: This list needs to be dynamic -- userspace needs to be able to
1329 * add items it requires. It also needs to be able to tell us to
1330 * look out for other vendor IEs.
1331 */
1332 static const u64 care_about_ies =
1333 (1ULL << WLAN_EID_COUNTRY) |
1334 (1ULL << WLAN_EID_ERP_INFO) |
1335 (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1336 (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1337 (1ULL << WLAN_EID_HT_CAPABILITY) |
1338 (1ULL << WLAN_EID_HT_INFORMATION);
1339
1340 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1341 struct ieee80211_mgmt *mgmt,
1342 size_t len,
1343 struct ieee80211_rx_status *rx_status)
1344 {
1345 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1346 size_t baselen;
1347 struct ieee802_11_elems elems;
1348 struct ieee80211_local *local = sdata->local;
1349 u32 changed = 0;
1350 bool erp_valid, directed_tim = false;
1351 u8 erp_value = 0;
1352 u32 ncrc;
1353 u8 *bssid;
1354
1355 ASSERT_MGD_MTX(ifmgd);
1356
1357 /* Process beacon from the current BSS */
1358 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1359 if (baselen > len)
1360 return;
1361
1362 if (rx_status->freq != local->hw.conf.channel->center_freq)
1363 return;
1364
1365 /*
1366 * We might have received a number of frames, among them a
1367 * disassoc frame and a beacon...
1368 */
1369 if (!ifmgd->associated)
1370 return;
1371
1372 bssid = ifmgd->associated->bssid;
1373
1374 /*
1375 * And in theory even frames from a different AP we were just
1376 * associated to a split-second ago!
1377 */
1378 if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1379 return;
1380
1381 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1382 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1383 if (net_ratelimit()) {
1384 printk(KERN_DEBUG "%s: cancelling probereq poll due "
1385 "to a received beacon\n", sdata->name);
1386 }
1387 #endif
1388 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1389 mutex_lock(&local->iflist_mtx);
1390 ieee80211_recalc_ps(local, -1);
1391 mutex_unlock(&local->iflist_mtx);
1392 }
1393
1394 /*
1395 * Push the beacon loss detection into the future since
1396 * we are processing a beacon from the AP just now.
1397 */
1398 mod_beacon_timer(sdata);
1399
1400 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1401 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1402 len - baselen, &elems,
1403 care_about_ies, ncrc);
1404
1405 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1406 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1407 ifmgd->aid);
1408
1409 if (ncrc != ifmgd->beacon_crc) {
1410 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1411 true);
1412
1413 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1414 elems.wmm_param_len);
1415 }
1416
1417 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1418 if (directed_tim) {
1419 if (local->hw.conf.dynamic_ps_timeout > 0) {
1420 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1421 ieee80211_hw_config(local,
1422 IEEE80211_CONF_CHANGE_PS);
1423 ieee80211_send_nullfunc(local, sdata, 0);
1424 } else {
1425 local->pspolling = true;
1426
1427 /*
1428 * Here is assumed that the driver will be
1429 * able to send ps-poll frame and receive a
1430 * response even though power save mode is
1431 * enabled, but some drivers might require
1432 * to disable power save here. This needs
1433 * to be investigated.
1434 */
1435 ieee80211_send_pspoll(local, sdata);
1436 }
1437 }
1438 }
1439
1440 if (ncrc == ifmgd->beacon_crc)
1441 return;
1442 ifmgd->beacon_crc = ncrc;
1443
1444 if (elems.erp_info && elems.erp_info_len >= 1) {
1445 erp_valid = true;
1446 erp_value = elems.erp_info[0];
1447 } else {
1448 erp_valid = false;
1449 }
1450 changed |= ieee80211_handle_bss_capability(sdata,
1451 le16_to_cpu(mgmt->u.beacon.capab_info),
1452 erp_valid, erp_value);
1453
1454
1455 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1456 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1457 struct sta_info *sta;
1458 struct ieee80211_supported_band *sband;
1459 u16 ap_ht_cap_flags;
1460
1461 rcu_read_lock();
1462
1463 sta = sta_info_get(sdata, bssid);
1464 if (WARN_ON(!sta)) {
1465 rcu_read_unlock();
1466 return;
1467 }
1468
1469 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1470
1471 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1472 elems.ht_cap_elem, &sta->sta.ht_cap);
1473
1474 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1475
1476 rcu_read_unlock();
1477
1478 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1479 bssid, ap_ht_cap_flags);
1480 }
1481
1482 /* Note: country IE parsing is done for us by cfg80211 */
1483 if (elems.country_elem) {
1484 /* TODO: IBSS also needs this */
1485 if (elems.pwr_constr_elem)
1486 ieee80211_handle_pwr_constr(sdata,
1487 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1488 elems.pwr_constr_elem,
1489 elems.pwr_constr_elem_len);
1490 }
1491
1492 ieee80211_bss_info_change_notify(sdata, changed);
1493 }
1494
1495 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1496 struct sk_buff *skb)
1497 {
1498 struct ieee80211_local *local = sdata->local;
1499 struct ieee80211_mgmt *mgmt;
1500 u16 fc;
1501
1502 if (skb->len < 24)
1503 return RX_DROP_MONITOR;
1504
1505 mgmt = (struct ieee80211_mgmt *) skb->data;
1506 fc = le16_to_cpu(mgmt->frame_control);
1507
1508 switch (fc & IEEE80211_FCTL_STYPE) {
1509 case IEEE80211_STYPE_PROBE_RESP:
1510 case IEEE80211_STYPE_BEACON:
1511 case IEEE80211_STYPE_DEAUTH:
1512 case IEEE80211_STYPE_DISASSOC:
1513 case IEEE80211_STYPE_ACTION:
1514 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1515 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
1516 return RX_QUEUED;
1517 }
1518
1519 return RX_DROP_MONITOR;
1520 }
1521
1522 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1523 struct sk_buff *skb)
1524 {
1525 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1526 struct ieee80211_rx_status *rx_status;
1527 struct ieee80211_mgmt *mgmt;
1528 enum rx_mgmt_action rma = RX_MGMT_NONE;
1529 u16 fc;
1530
1531 rx_status = (struct ieee80211_rx_status *) skb->cb;
1532 mgmt = (struct ieee80211_mgmt *) skb->data;
1533 fc = le16_to_cpu(mgmt->frame_control);
1534
1535 mutex_lock(&ifmgd->mtx);
1536
1537 if (ifmgd->associated &&
1538 memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1539 switch (fc & IEEE80211_FCTL_STYPE) {
1540 case IEEE80211_STYPE_BEACON:
1541 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1542 rx_status);
1543 break;
1544 case IEEE80211_STYPE_PROBE_RESP:
1545 ieee80211_rx_mgmt_probe_resp(sdata, skb);
1546 break;
1547 case IEEE80211_STYPE_DEAUTH:
1548 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1549 break;
1550 case IEEE80211_STYPE_DISASSOC:
1551 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1552 break;
1553 case IEEE80211_STYPE_ACTION:
1554 if (mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
1555 break;
1556
1557 ieee80211_sta_process_chanswitch(sdata,
1558 &mgmt->u.action.u.chan_switch.sw_elem,
1559 (void *)ifmgd->associated->priv);
1560 break;
1561 }
1562 mutex_unlock(&ifmgd->mtx);
1563
1564 switch (rma) {
1565 case RX_MGMT_NONE:
1566 /* no action */
1567 break;
1568 case RX_MGMT_CFG80211_DEAUTH:
1569 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1570 break;
1571 case RX_MGMT_CFG80211_DISASSOC:
1572 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1573 break;
1574 default:
1575 WARN(1, "unexpected: %d", rma);
1576 }
1577 goto out;
1578 }
1579
1580 mutex_unlock(&ifmgd->mtx);
1581
1582 if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1583 (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH)
1584 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1585
1586 out:
1587 kfree_skb(skb);
1588 }
1589
1590 static void ieee80211_sta_timer(unsigned long data)
1591 {
1592 struct ieee80211_sub_if_data *sdata =
1593 (struct ieee80211_sub_if_data *) data;
1594 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1595 struct ieee80211_local *local = sdata->local;
1596
1597 if (local->quiescing) {
1598 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1599 return;
1600 }
1601
1602 ieee80211_queue_work(&local->hw, &ifmgd->work);
1603 }
1604
1605 static void ieee80211_sta_work(struct work_struct *work)
1606 {
1607 struct ieee80211_sub_if_data *sdata =
1608 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1609 struct ieee80211_local *local = sdata->local;
1610 struct ieee80211_if_managed *ifmgd;
1611 struct sk_buff *skb;
1612
1613 if (!ieee80211_sdata_running(sdata))
1614 return;
1615
1616 if (local->scanning)
1617 return;
1618
1619 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1620 return;
1621
1622 /*
1623 * ieee80211_queue_work() should have picked up most cases,
1624 * here we'll pick the the rest.
1625 */
1626 if (WARN(local->suspended, "STA MLME work scheduled while "
1627 "going to suspend\n"))
1628 return;
1629
1630 ifmgd = &sdata->u.mgd;
1631
1632 /* first process frames to avoid timing out while a frame is pending */
1633 while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1634 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1635
1636 /* then process the rest of the work */
1637 mutex_lock(&ifmgd->mtx);
1638
1639 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1640 IEEE80211_STA_CONNECTION_POLL) &&
1641 ifmgd->associated) {
1642 u8 bssid[ETH_ALEN];
1643
1644 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1645 if (time_is_after_jiffies(ifmgd->probe_timeout))
1646 run_again(ifmgd, ifmgd->probe_timeout);
1647
1648 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1649 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1650 printk(KERN_DEBUG "No probe response from AP %pM"
1651 " after %dms, try %d\n", bssid,
1652 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1653 ifmgd->probe_send_count);
1654 #endif
1655 ieee80211_mgd_probe_ap_send(sdata);
1656 } else {
1657 /*
1658 * We actually lost the connection ... or did we?
1659 * Let's make sure!
1660 */
1661 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1662 IEEE80211_STA_BEACON_POLL);
1663 printk(KERN_DEBUG "No probe response from AP %pM"
1664 " after %dms, disconnecting.\n",
1665 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1666 ieee80211_set_disassoc(sdata);
1667 ieee80211_recalc_idle(local);
1668 mutex_unlock(&ifmgd->mtx);
1669 /*
1670 * must be outside lock due to cfg80211,
1671 * but that's not a problem.
1672 */
1673 ieee80211_send_deauth_disassoc(sdata, bssid,
1674 IEEE80211_STYPE_DEAUTH,
1675 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1676 NULL);
1677 mutex_lock(&ifmgd->mtx);
1678 }
1679 }
1680
1681 mutex_unlock(&ifmgd->mtx);
1682 }
1683
1684 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1685 {
1686 struct ieee80211_sub_if_data *sdata =
1687 (struct ieee80211_sub_if_data *) data;
1688 struct ieee80211_local *local = sdata->local;
1689
1690 if (local->quiescing)
1691 return;
1692
1693 ieee80211_queue_work(&sdata->local->hw,
1694 &sdata->u.mgd.beacon_connection_loss_work);
1695 }
1696
1697 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1698 {
1699 struct ieee80211_sub_if_data *sdata =
1700 (struct ieee80211_sub_if_data *) data;
1701 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1702 struct ieee80211_local *local = sdata->local;
1703
1704 if (local->quiescing)
1705 return;
1706
1707 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1708 }
1709
1710 static void ieee80211_sta_monitor_work(struct work_struct *work)
1711 {
1712 struct ieee80211_sub_if_data *sdata =
1713 container_of(work, struct ieee80211_sub_if_data,
1714 u.mgd.monitor_work);
1715
1716 ieee80211_mgd_probe_ap(sdata, false);
1717 }
1718
1719 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1720 {
1721 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1722 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1723 IEEE80211_STA_CONNECTION_POLL);
1724
1725 /* let's probe the connection once */
1726 ieee80211_queue_work(&sdata->local->hw,
1727 &sdata->u.mgd.monitor_work);
1728 /* and do all the other regular work too */
1729 ieee80211_queue_work(&sdata->local->hw,
1730 &sdata->u.mgd.work);
1731 }
1732 }
1733
1734 #ifdef CONFIG_PM
1735 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1736 {
1737 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1738
1739 /*
1740 * we need to use atomic bitops for the running bits
1741 * only because both timers might fire at the same
1742 * time -- the code here is properly synchronised.
1743 */
1744
1745 cancel_work_sync(&ifmgd->work);
1746 cancel_work_sync(&ifmgd->beacon_connection_loss_work);
1747 if (del_timer_sync(&ifmgd->timer))
1748 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1749
1750 cancel_work_sync(&ifmgd->chswitch_work);
1751 if (del_timer_sync(&ifmgd->chswitch_timer))
1752 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1753
1754 cancel_work_sync(&ifmgd->monitor_work);
1755 /* these will just be re-established on connection */
1756 del_timer_sync(&ifmgd->conn_mon_timer);
1757 del_timer_sync(&ifmgd->bcn_mon_timer);
1758 }
1759
1760 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1761 {
1762 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1763
1764 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1765 add_timer(&ifmgd->timer);
1766 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1767 add_timer(&ifmgd->chswitch_timer);
1768 }
1769 #endif
1770
1771 /* interface setup */
1772 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1773 {
1774 struct ieee80211_if_managed *ifmgd;
1775
1776 ifmgd = &sdata->u.mgd;
1777 INIT_WORK(&ifmgd->work, ieee80211_sta_work);
1778 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1779 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1780 INIT_WORK(&ifmgd->beacon_connection_loss_work,
1781 ieee80211_beacon_connection_loss_work);
1782 setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1783 (unsigned long) sdata);
1784 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1785 (unsigned long) sdata);
1786 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1787 (unsigned long) sdata);
1788 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1789 (unsigned long) sdata);
1790 skb_queue_head_init(&ifmgd->skb_queue);
1791
1792 ifmgd->flags = 0;
1793
1794 mutex_init(&ifmgd->mtx);
1795
1796 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1797 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1798 else
1799 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1800 }
1801
1802 /* scan finished notification */
1803 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1804 {
1805 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1806
1807 /* Restart STA timers */
1808 rcu_read_lock();
1809 list_for_each_entry_rcu(sdata, &local->interfaces, list)
1810 ieee80211_restart_sta_timer(sdata);
1811 rcu_read_unlock();
1812 }
1813
1814 int ieee80211_max_network_latency(struct notifier_block *nb,
1815 unsigned long data, void *dummy)
1816 {
1817 s32 latency_usec = (s32) data;
1818 struct ieee80211_local *local =
1819 container_of(nb, struct ieee80211_local,
1820 network_latency_notifier);
1821
1822 mutex_lock(&local->iflist_mtx);
1823 ieee80211_recalc_ps(local, latency_usec);
1824 mutex_unlock(&local->iflist_mtx);
1825
1826 return 0;
1827 }
1828
1829 /* config hooks */
1830 static enum work_done_result
1831 ieee80211_probe_auth_done(struct ieee80211_work *wk,
1832 struct sk_buff *skb)
1833 {
1834 if (!skb) {
1835 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
1836 return WORK_DONE_DESTROY;
1837 }
1838
1839 if (wk->type == IEEE80211_WORK_AUTH) {
1840 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
1841 return WORK_DONE_DESTROY;
1842 }
1843
1844 mutex_lock(&wk->sdata->u.mgd.mtx);
1845 ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
1846 mutex_unlock(&wk->sdata->u.mgd.mtx);
1847
1848 wk->type = IEEE80211_WORK_AUTH;
1849 wk->probe_auth.tries = 0;
1850 return WORK_DONE_REQUEUE;
1851 }
1852
1853 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
1854 struct cfg80211_auth_request *req)
1855 {
1856 const u8 *ssid;
1857 struct ieee80211_work *wk;
1858 u16 auth_alg;
1859
1860 switch (req->auth_type) {
1861 case NL80211_AUTHTYPE_OPEN_SYSTEM:
1862 auth_alg = WLAN_AUTH_OPEN;
1863 break;
1864 case NL80211_AUTHTYPE_SHARED_KEY:
1865 auth_alg = WLAN_AUTH_SHARED_KEY;
1866 break;
1867 case NL80211_AUTHTYPE_FT:
1868 auth_alg = WLAN_AUTH_FT;
1869 break;
1870 case NL80211_AUTHTYPE_NETWORK_EAP:
1871 auth_alg = WLAN_AUTH_LEAP;
1872 break;
1873 default:
1874 return -EOPNOTSUPP;
1875 }
1876
1877 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1878 if (!wk)
1879 return -ENOMEM;
1880
1881 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1882
1883 if (req->ie && req->ie_len) {
1884 memcpy(wk->ie, req->ie, req->ie_len);
1885 wk->ie_len = req->ie_len;
1886 }
1887
1888 if (req->key && req->key_len) {
1889 wk->probe_auth.key_len = req->key_len;
1890 wk->probe_auth.key_idx = req->key_idx;
1891 memcpy(wk->probe_auth.key, req->key, req->key_len);
1892 }
1893
1894 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1895 memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
1896 wk->probe_auth.ssid_len = ssid[1];
1897
1898 wk->probe_auth.algorithm = auth_alg;
1899 wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
1900
1901 /* if we already have a probe, don't probe again */
1902 if (req->bss->proberesp_ies)
1903 wk->type = IEEE80211_WORK_AUTH;
1904 else
1905 wk->type = IEEE80211_WORK_DIRECT_PROBE;
1906 wk->chan = req->bss->channel;
1907 wk->sdata = sdata;
1908 wk->done = ieee80211_probe_auth_done;
1909
1910 ieee80211_add_work(wk);
1911 return 0;
1912 }
1913
1914 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
1915 struct sk_buff *skb)
1916 {
1917 struct ieee80211_mgmt *mgmt;
1918 u16 status;
1919
1920 if (!skb) {
1921 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
1922 return WORK_DONE_DESTROY;
1923 }
1924
1925 mgmt = (void *)skb->data;
1926 status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1927
1928 if (status == WLAN_STATUS_SUCCESS) {
1929 mutex_lock(&wk->sdata->u.mgd.mtx);
1930 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
1931 mutex_unlock(&wk->sdata->u.mgd.mtx);
1932 /* oops -- internal error -- send timeout for now */
1933 cfg80211_send_assoc_timeout(wk->sdata->dev,
1934 wk->filter_ta);
1935 return WORK_DONE_DESTROY;
1936 }
1937 mutex_unlock(&wk->sdata->u.mgd.mtx);
1938 }
1939
1940 cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
1941 return WORK_DONE_DESTROY;
1942 }
1943
1944 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
1945 struct cfg80211_assoc_request *req)
1946 {
1947 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1948 struct ieee80211_bss *bss = (void *)req->bss->priv;
1949 struct ieee80211_work *wk;
1950 const u8 *ssid;
1951 int i;
1952
1953 mutex_lock(&ifmgd->mtx);
1954 if (ifmgd->associated) {
1955 if (!req->prev_bssid ||
1956 memcmp(req->prev_bssid, ifmgd->associated->bssid,
1957 ETH_ALEN)) {
1958 /*
1959 * We are already associated and the request was not a
1960 * reassociation request from the current BSS, so
1961 * reject it.
1962 */
1963 mutex_unlock(&ifmgd->mtx);
1964 return -EALREADY;
1965 }
1966
1967 /* Trying to reassociate - clear previous association state */
1968 ieee80211_set_disassoc(sdata);
1969 }
1970 mutex_unlock(&ifmgd->mtx);
1971
1972 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1973 if (!wk)
1974 return -ENOMEM;
1975
1976 ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
1977 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1978
1979 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
1980 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
1981 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
1982 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
1983 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
1984
1985
1986 if (req->ie && req->ie_len) {
1987 memcpy(wk->ie, req->ie, req->ie_len);
1988 wk->ie_len = req->ie_len;
1989 } else
1990 wk->ie_len = 0;
1991
1992 wk->assoc.bss = req->bss;
1993
1994 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1995
1996 /* new association always uses requested smps mode */
1997 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
1998 if (ifmgd->powersave)
1999 ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2000 else
2001 ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2002 } else
2003 ifmgd->ap_smps = ifmgd->req_smps;
2004
2005 wk->assoc.smps = ifmgd->ap_smps;
2006 /*
2007 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2008 * We still associate in non-HT mode (11a/b/g) if any one of these
2009 * ciphers is configured as pairwise.
2010 * We can set this to true for non-11n hardware, that'll be checked
2011 * separately along with the peer capabilities.
2012 */
2013 wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2014 wk->assoc.capability = req->bss->capability;
2015 wk->assoc.wmm_used = bss->wmm_used;
2016 wk->assoc.supp_rates = bss->supp_rates;
2017 wk->assoc.supp_rates_len = bss->supp_rates_len;
2018 wk->assoc.ht_information_ie =
2019 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2020
2021 if (bss->wmm_used && bss->uapsd_supported &&
2022 (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2023 wk->assoc.uapsd_used = true;
2024 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2025 } else {
2026 wk->assoc.uapsd_used = false;
2027 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2028 }
2029
2030 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2031 memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2032 wk->assoc.ssid_len = ssid[1];
2033
2034 if (req->prev_bssid)
2035 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2036
2037 wk->type = IEEE80211_WORK_ASSOC;
2038 wk->chan = req->bss->channel;
2039 wk->sdata = sdata;
2040 wk->done = ieee80211_assoc_done;
2041
2042 if (req->use_mfp) {
2043 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2044 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2045 } else {
2046 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2047 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2048 }
2049
2050 if (req->crypto.control_port)
2051 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2052 else
2053 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2054
2055 ieee80211_add_work(wk);
2056 return 0;
2057 }
2058
2059 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2060 struct cfg80211_deauth_request *req,
2061 void *cookie)
2062 {
2063 struct ieee80211_local *local = sdata->local;
2064 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2065 struct ieee80211_work *wk;
2066 const u8 *bssid = req->bss->bssid;
2067
2068 mutex_lock(&ifmgd->mtx);
2069
2070 if (ifmgd->associated == req->bss) {
2071 bssid = req->bss->bssid;
2072 ieee80211_set_disassoc(sdata);
2073 mutex_unlock(&ifmgd->mtx);
2074 } else {
2075 bool not_auth_yet = false;
2076
2077 mutex_unlock(&ifmgd->mtx);
2078
2079 mutex_lock(&local->work_mtx);
2080 list_for_each_entry(wk, &local->work_list, list) {
2081 if (wk->sdata != sdata)
2082 continue;
2083
2084 if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2085 wk->type != IEEE80211_WORK_AUTH)
2086 continue;
2087
2088 if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2089 continue;
2090
2091 not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2092 list_del_rcu(&wk->list);
2093 free_work(wk);
2094 break;
2095 }
2096 mutex_unlock(&local->work_mtx);
2097
2098 /*
2099 * If somebody requests authentication and we haven't
2100 * sent out an auth frame yet there's no need to send
2101 * out a deauth frame either. If the state was PROBE,
2102 * then this is the case. If it's AUTH we have sent a
2103 * frame, and if it's IDLE we have completed the auth
2104 * process already.
2105 */
2106 if (not_auth_yet) {
2107 __cfg80211_auth_canceled(sdata->dev, bssid);
2108 return 0;
2109 }
2110 }
2111
2112 printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2113 sdata->name, bssid, req->reason_code);
2114
2115 ieee80211_send_deauth_disassoc(sdata, bssid,
2116 IEEE80211_STYPE_DEAUTH, req->reason_code,
2117 cookie);
2118
2119 ieee80211_recalc_idle(sdata->local);
2120
2121 return 0;
2122 }
2123
2124 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2125 struct cfg80211_disassoc_request *req,
2126 void *cookie)
2127 {
2128 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2129
2130 mutex_lock(&ifmgd->mtx);
2131
2132 /*
2133 * cfg80211 should catch this ... but it's racy since
2134 * we can receive a disassoc frame, process it, hand it
2135 * to cfg80211 while that's in a locked section already
2136 * trying to tell us that the user wants to disconnect.
2137 */
2138 if (ifmgd->associated != req->bss) {
2139 mutex_unlock(&ifmgd->mtx);
2140 return -ENOLINK;
2141 }
2142
2143 printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2144 sdata->name, req->bss->bssid, req->reason_code);
2145
2146 ieee80211_set_disassoc(sdata);
2147
2148 mutex_unlock(&ifmgd->mtx);
2149
2150 ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2151 IEEE80211_STYPE_DISASSOC, req->reason_code,
2152 cookie);
2153
2154 ieee80211_recalc_idle(sdata->local);
2155
2156 return 0;
2157 }
2158
2159 int ieee80211_mgd_action(struct ieee80211_sub_if_data *sdata,
2160 struct ieee80211_channel *chan,
2161 enum nl80211_channel_type channel_type,
2162 const u8 *buf, size_t len, u64 *cookie)
2163 {
2164 struct ieee80211_local *local = sdata->local;
2165 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2166 struct sk_buff *skb;
2167
2168 /* Check that we are on the requested channel for transmission */
2169 if ((chan != local->tmp_channel ||
2170 channel_type != local->tmp_channel_type) &&
2171 (chan != local->oper_channel ||
2172 channel_type != local->oper_channel_type))
2173 return -EBUSY;
2174
2175 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len);
2176 if (!skb)
2177 return -ENOMEM;
2178 skb_reserve(skb, local->hw.extra_tx_headroom);
2179
2180 memcpy(skb_put(skb, len), buf, len);
2181
2182 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
2183 IEEE80211_SKB_CB(skb)->flags |=
2184 IEEE80211_TX_INTFL_DONT_ENCRYPT;
2185 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX |
2186 IEEE80211_TX_CTL_REQ_TX_STATUS;
2187 skb->dev = sdata->dev;
2188 ieee80211_tx_skb(sdata, skb);
2189
2190 *cookie = (unsigned long) skb;
2191 return 0;
2192 }
2193
2194 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2195 enum nl80211_cqm_rssi_threshold_event rssi_event,
2196 gfp_t gfp)
2197 {
2198 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2199
2200 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2201 }
2202 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree