projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
mac80211: Add interface for driver to temporarily disable dynamic ps
[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 <linux/slab.h>
23 #include <net/mac80211.h>
24 #include <asm/unaligned.h>
25
26 #include "ieee80211_i.h"
27 #include "driver-ops.h"
28 #include "rate.h"
29 #include "led.h"
30
31 #define IEEE80211_MAX_PROBE_TRIES 5
32
33 /*
34 * beacon loss detection timeout
35 * XXX: should depend on beacon interval
36 */
37 #define IEEE80211_BEACON_LOSS_TIME (2 * HZ)
38 /*
39 * Time the connection can be idle before we probe
40 * it to see if we can still talk to the AP.
41 */
42 #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ)
43 /*
44 * Time we wait for a probe response after sending
45 * a probe request because of beacon loss or for
46 * checking the connection still works.
47 */
48 #define IEEE80211_PROBE_WAIT (HZ / 2)
49
50 /*
51 * Weight given to the latest Beacon frame when calculating average signal
52 * strength for Beacon frames received in the current BSS. This must be
53 * between 1 and 15.
54 */
55 #define IEEE80211_SIGNAL_AVE_WEIGHT 3
56
57 #define TMR_RUNNING_TIMER 0
58 #define TMR_RUNNING_CHANSW 1
59
60 /*
61 * All cfg80211 functions have to be called outside a locked
62 * section so that they can acquire a lock themselves... This
63 * is much simpler than queuing up things in cfg80211, but we
64 * do need some indirection for that here.
65 */
66 enum rx_mgmt_action {
67 /* no action required */
68 RX_MGMT_NONE,
69
70 /* caller must call cfg80211_send_rx_auth() */
71 RX_MGMT_CFG80211_AUTH,
72
73 /* caller must call cfg80211_send_rx_assoc() */
74 RX_MGMT_CFG80211_ASSOC,
75
76 /* caller must call cfg80211_send_deauth() */
77 RX_MGMT_CFG80211_DEAUTH,
78
79 /* caller must call cfg80211_send_disassoc() */
80 RX_MGMT_CFG80211_DISASSOC,
81
82 /* caller must tell cfg80211 about internal error */
83 RX_MGMT_CFG80211_ASSOC_ERROR,
84 };
85
86 /* utils */
87 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
88 {
89 WARN_ON(!mutex_is_locked(&ifmgd->mtx));
90 }
91
92 /*
93 * We can have multiple work items (and connection probing)
94 * scheduling this timer, but we need to take care to only
95 * reschedule it when it should fire _earlier_ than it was
96 * asked for before, or if it's not pending right now. This
97 * function ensures that. Note that it then is required to
98 * run this function for all timeouts after the first one
99 * has happened -- the work that runs from this timer will
100 * do that.
101 */
102 static void run_again(struct ieee80211_if_managed *ifmgd,
103 unsigned long timeout)
104 {
105 ASSERT_MGD_MTX(ifmgd);
106
107 if (!timer_pending(&ifmgd->timer) ||
108 time_before(timeout, ifmgd->timer.expires))
109 mod_timer(&ifmgd->timer, timeout);
110 }
111
112 static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata)
113 {
114 if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
115 return;
116
117 mod_timer(&sdata->u.mgd.bcn_mon_timer,
118 round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME));
119 }
120
121 static int ecw2cw(int ecw)
122 {
123 return (1 << ecw) - 1;
124 }
125
126 /*
127 * ieee80211_enable_ht should be called only after the operating band
128 * has been determined as ht configuration depends on the hw's
129 * HT abilities for a specific band.
130 */
131 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
132 struct ieee80211_ht_info *hti,
133 const u8 *bssid, u16 ap_ht_cap_flags)
134 {
135 struct ieee80211_local *local = sdata->local;
136 struct ieee80211_supported_band *sband;
137 struct sta_info *sta;
138 u32 changed = 0;
139 u16 ht_opmode;
140 bool enable_ht = true;
141 enum nl80211_channel_type prev_chantype;
142 enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
143
144 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
145
146 prev_chantype = sdata->vif.bss_conf.channel_type;
147
148 /* HT is not supported */
149 if (!sband->ht_cap.ht_supported)
150 enable_ht = false;
151
152 /* check that channel matches the right operating channel */
153 if (local->hw.conf.channel->center_freq !=
154 ieee80211_channel_to_frequency(hti->control_chan))
155 enable_ht = false;
156
157 if (enable_ht) {
158 channel_type = NL80211_CHAN_HT20;
159
160 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
161 (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
162 (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
163 switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
164 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
165 if (!(local->hw.conf.channel->flags &
166 IEEE80211_CHAN_NO_HT40PLUS))
167 channel_type = NL80211_CHAN_HT40PLUS;
168 break;
169 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
170 if (!(local->hw.conf.channel->flags &
171 IEEE80211_CHAN_NO_HT40MINUS))
172 channel_type = NL80211_CHAN_HT40MINUS;
173 break;
174 }
175 }
176 }
177
178 if (local->tmp_channel)
179 local->tmp_channel_type = channel_type;
180
181 if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
182 /* can only fail due to HT40+/- mismatch */
183 channel_type = NL80211_CHAN_HT20;
184 WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type));
185 }
186
187 /* channel_type change automatically detected */
188 ieee80211_hw_config(local, 0);
189
190 if (prev_chantype != channel_type) {
191 rcu_read_lock();
192 sta = sta_info_get(sdata, bssid);
193 if (sta)
194 rate_control_rate_update(local, sband, sta,
195 IEEE80211_RC_HT_CHANGED,
196 channel_type);
197 rcu_read_unlock();
198 }
199
200 ht_opmode = le16_to_cpu(hti->operation_mode);
201
202 /* if bss configuration changed store the new one */
203 if (sdata->ht_opmode_valid != enable_ht ||
204 sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
205 prev_chantype != channel_type) {
206 changed |= BSS_CHANGED_HT;
207 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
208 sdata->ht_opmode_valid = enable_ht;
209 }
210
211 return changed;
212 }
213
214 /* frame sending functions */
215
216 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
217 const u8 *bssid, u16 stype, u16 reason,
218 void *cookie, bool send_frame)
219 {
220 struct ieee80211_local *local = sdata->local;
221 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
222 struct sk_buff *skb;
223 struct ieee80211_mgmt *mgmt;
224
225 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
226 if (!skb) {
227 printk(KERN_DEBUG "%s: failed to allocate buffer for "
228 "deauth/disassoc frame\n", sdata->name);
229 return;
230 }
231 skb_reserve(skb, local->hw.extra_tx_headroom);
232
233 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
234 memset(mgmt, 0, 24);
235 memcpy(mgmt->da, bssid, ETH_ALEN);
236 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
237 memcpy(mgmt->bssid, bssid, ETH_ALEN);
238 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
239 skb_put(skb, 2);
240 /* u.deauth.reason_code == u.disassoc.reason_code */
241 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
242
243 if (stype == IEEE80211_STYPE_DEAUTH)
244 if (cookie)
245 __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
246 else
247 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
248 else
249 if (cookie)
250 __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
251 else
252 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
253 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
254 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
255
256 if (send_frame)
257 ieee80211_tx_skb(sdata, skb);
258 else
259 kfree_skb(skb);
260 }
261
262 void ieee80211_send_pspoll(struct ieee80211_local *local,
263 struct ieee80211_sub_if_data *sdata)
264 {
265 struct ieee80211_pspoll *pspoll;
266 struct sk_buff *skb;
267
268 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
269 if (!skb)
270 return;
271
272 pspoll = (struct ieee80211_pspoll *) skb->data;
273 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
274
275 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
276 ieee80211_tx_skb(sdata, skb);
277 }
278
279 void ieee80211_send_nullfunc(struct ieee80211_local *local,
280 struct ieee80211_sub_if_data *sdata,
281 int powersave)
282 {
283 struct sk_buff *skb;
284 struct ieee80211_hdr_3addr *nullfunc;
285
286 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
287 if (!skb)
288 return;
289
290 nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
291 if (powersave)
292 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
293
294 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
295 ieee80211_tx_skb(sdata, skb);
296 }
297
298 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
299 struct ieee80211_sub_if_data *sdata)
300 {
301 struct sk_buff *skb;
302 struct ieee80211_hdr *nullfunc;
303 __le16 fc;
304
305 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
306 return;
307
308 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
309 if (!skb) {
310 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
311 "nullfunc frame\n", sdata->name);
312 return;
313 }
314 skb_reserve(skb, local->hw.extra_tx_headroom);
315
316 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
317 memset(nullfunc, 0, 30);
318 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
319 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
320 nullfunc->frame_control = fc;
321 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
322 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
323 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
324 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
325
326 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
327 ieee80211_tx_skb(sdata, skb);
328 }
329
330 /* spectrum management related things */
331 static void ieee80211_chswitch_work(struct work_struct *work)
332 {
333 struct ieee80211_sub_if_data *sdata =
334 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
335 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
336
337 if (!ieee80211_sdata_running(sdata))
338 return;
339
340 mutex_lock(&ifmgd->mtx);
341 if (!ifmgd->associated)
342 goto out;
343
344 sdata->local->oper_channel = sdata->local->csa_channel;
345 if (!sdata->local->ops->channel_switch) {
346 /* call "hw_config" only if doing sw channel switch */
347 ieee80211_hw_config(sdata->local,
348 IEEE80211_CONF_CHANGE_CHANNEL);
349 }
350
351 /* XXX: shouldn't really modify cfg80211-owned data! */
352 ifmgd->associated->channel = sdata->local->oper_channel;
353
354 ieee80211_wake_queues_by_reason(&sdata->local->hw,
355 IEEE80211_QUEUE_STOP_REASON_CSA);
356 out:
357 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
358 mutex_unlock(&ifmgd->mtx);
359 }
360
361 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
362 {
363 struct ieee80211_sub_if_data *sdata;
364 struct ieee80211_if_managed *ifmgd;
365
366 sdata = vif_to_sdata(vif);
367 ifmgd = &sdata->u.mgd;
368
369 trace_api_chswitch_done(sdata, success);
370 if (!success) {
371 /*
372 * If the channel switch was not successful, stay
373 * around on the old channel. We currently lack
374 * good handling of this situation, possibly we
375 * should just drop the association.
376 */
377 sdata->local->csa_channel = sdata->local->oper_channel;
378 }
379
380 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
381 }
382 EXPORT_SYMBOL(ieee80211_chswitch_done);
383
384 static void ieee80211_chswitch_timer(unsigned long data)
385 {
386 struct ieee80211_sub_if_data *sdata =
387 (struct ieee80211_sub_if_data *) data;
388 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
389
390 if (sdata->local->quiescing) {
391 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
392 return;
393 }
394
395 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
396 }
397
398 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
399 struct ieee80211_channel_sw_ie *sw_elem,
400 struct ieee80211_bss *bss,
401 u64 timestamp)
402 {
403 struct cfg80211_bss *cbss =
404 container_of((void *)bss, struct cfg80211_bss, priv);
405 struct ieee80211_channel *new_ch;
406 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
407 int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
408
409 ASSERT_MGD_MTX(ifmgd);
410
411 if (!ifmgd->associated)
412 return;
413
414 if (sdata->local->scanning)
415 return;
416
417 /* Disregard subsequent beacons if we are already running a timer
418 processing a CSA */
419
420 if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
421 return;
422
423 new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
424 if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
425 return;
426
427 sdata->local->csa_channel = new_ch;
428
429 if (sdata->local->ops->channel_switch) {
430 /* use driver's channel switch callback */
431 struct ieee80211_channel_switch ch_switch;
432 memset(&ch_switch, 0, sizeof(ch_switch));
433 ch_switch.timestamp = timestamp;
434 if (sw_elem->mode) {
435 ch_switch.block_tx = true;
436 ieee80211_stop_queues_by_reason(&sdata->local->hw,
437 IEEE80211_QUEUE_STOP_REASON_CSA);
438 }
439 ch_switch.channel = new_ch;
440 ch_switch.count = sw_elem->count;
441 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
442 drv_channel_switch(sdata->local, &ch_switch);
443 return;
444 }
445
446 /* channel switch handled in software */
447 if (sw_elem->count <= 1) {
448 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
449 } else {
450 if (sw_elem->mode)
451 ieee80211_stop_queues_by_reason(&sdata->local->hw,
452 IEEE80211_QUEUE_STOP_REASON_CSA);
453 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
454 mod_timer(&ifmgd->chswitch_timer,
455 jiffies +
456 msecs_to_jiffies(sw_elem->count *
457 cbss->beacon_interval));
458 }
459 }
460
461 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
462 u16 capab_info, u8 *pwr_constr_elem,
463 u8 pwr_constr_elem_len)
464 {
465 struct ieee80211_conf *conf = &sdata->local->hw.conf;
466
467 if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
468 return;
469
470 /* Power constraint IE length should be 1 octet */
471 if (pwr_constr_elem_len != 1)
472 return;
473
474 if ((*pwr_constr_elem <= conf->channel->max_power) &&
475 (*pwr_constr_elem != sdata->local->power_constr_level)) {
476 sdata->local->power_constr_level = *pwr_constr_elem;
477 ieee80211_hw_config(sdata->local, 0);
478 }
479 }
480
481 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
482 {
483 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
484 struct ieee80211_local *local = sdata->local;
485 struct ieee80211_conf *conf = &local->hw.conf;
486
487 WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
488 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
489 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
490
491 local->disable_dynamic_ps = false;
492 conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
493 }
494 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
495
496 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
497 {
498 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
499 struct ieee80211_local *local = sdata->local;
500 struct ieee80211_conf *conf = &local->hw.conf;
501
502 WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
503 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
504 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
505
506 local->disable_dynamic_ps = true;
507 conf->dynamic_ps_timeout = 0;
508 del_timer_sync(&local->dynamic_ps_timer);
509 ieee80211_queue_work(&local->hw,
510 &local->dynamic_ps_enable_work);
511 }
512 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
513
514 /* powersave */
515 static void ieee80211_enable_ps(struct ieee80211_local *local,
516 struct ieee80211_sub_if_data *sdata)
517 {
518 struct ieee80211_conf *conf = &local->hw.conf;
519
520 /*
521 * If we are scanning right now then the parameters will
522 * take effect when scan finishes.
523 */
524 if (local->scanning)
525 return;
526
527 if (conf->dynamic_ps_timeout > 0 &&
528 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
529 mod_timer(&local->dynamic_ps_timer, jiffies +
530 msecs_to_jiffies(conf->dynamic_ps_timeout));
531 } else {
532 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
533 ieee80211_send_nullfunc(local, sdata, 1);
534
535 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
536 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
537 return;
538
539 conf->flags |= IEEE80211_CONF_PS;
540 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
541 }
542 }
543
544 static void ieee80211_change_ps(struct ieee80211_local *local)
545 {
546 struct ieee80211_conf *conf = &local->hw.conf;
547
548 if (local->ps_sdata) {
549 ieee80211_enable_ps(local, local->ps_sdata);
550 } else if (conf->flags & IEEE80211_CONF_PS) {
551 conf->flags &= ~IEEE80211_CONF_PS;
552 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
553 del_timer_sync(&local->dynamic_ps_timer);
554 cancel_work_sync(&local->dynamic_ps_enable_work);
555 }
556 }
557
558 /* need to hold RTNL or interface lock */
559 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
560 {
561 struct ieee80211_sub_if_data *sdata, *found = NULL;
562 int count = 0;
563 int timeout;
564
565 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
566 local->ps_sdata = NULL;
567 return;
568 }
569
570 if (!list_empty(&local->work_list)) {
571 local->ps_sdata = NULL;
572 goto change;
573 }
574
575 list_for_each_entry(sdata, &local->interfaces, list) {
576 if (!ieee80211_sdata_running(sdata))
577 continue;
578 if (sdata->vif.type != NL80211_IFTYPE_STATION)
579 continue;
580 found = sdata;
581 count++;
582 }
583
584 if (count == 1 && found->u.mgd.powersave &&
585 found->u.mgd.associated &&
586 found->u.mgd.associated->beacon_ies &&
587 !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
588 IEEE80211_STA_CONNECTION_POLL))) {
589 struct ieee80211_conf *conf = &local->hw.conf;
590 s32 beaconint_us;
591
592 if (latency < 0)
593 latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
594
595 beaconint_us = ieee80211_tu_to_usec(
596 found->vif.bss_conf.beacon_int);
597
598 timeout = local->dynamic_ps_forced_timeout;
599 if (timeout < 0) {
600 /*
601 * Go to full PSM if the user configures a very low
602 * latency requirement.
603 * The 2 second value is there for compatibility until
604 * the PM_QOS_NETWORK_LATENCY is configured with real
605 * values.
606 */
607 if (latency > 1900000000 && latency != 2000000000)
608 timeout = 0;
609 else
610 timeout = 100;
611 }
612 local->dynamic_ps_user_timeout = timeout;
613 if (!local->disable_dynamic_ps)
614 conf->dynamic_ps_timeout =
615 local->dynamic_ps_user_timeout;
616
617 if (beaconint_us > latency) {
618 local->ps_sdata = NULL;
619 } else {
620 struct ieee80211_bss *bss;
621 int maxslp = 1;
622 u8 dtimper;
623
624 bss = (void *)found->u.mgd.associated->priv;
625 dtimper = bss->dtim_period;
626
627 /* If the TIM IE is invalid, pretend the value is 1 */
628 if (!dtimper)
629 dtimper = 1;
630 else if (dtimper > 1)
631 maxslp = min_t(int, dtimper,
632 latency / beaconint_us);
633
634 local->hw.conf.max_sleep_period = maxslp;
635 local->hw.conf.ps_dtim_period = dtimper;
636 local->ps_sdata = found;
637 }
638 } else {
639 local->ps_sdata = NULL;
640 }
641
642 change:
643 ieee80211_change_ps(local);
644 }
645
646 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
647 {
648 struct ieee80211_local *local =
649 container_of(work, struct ieee80211_local,
650 dynamic_ps_disable_work);
651
652 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
653 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
654 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
655 }
656
657 ieee80211_wake_queues_by_reason(&local->hw,
658 IEEE80211_QUEUE_STOP_REASON_PS);
659 }
660
661 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
662 {
663 struct ieee80211_local *local =
664 container_of(work, struct ieee80211_local,
665 dynamic_ps_enable_work);
666 struct ieee80211_sub_if_data *sdata = local->ps_sdata;
667 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
668
669 /* can only happen when PS was just disabled anyway */
670 if (!sdata)
671 return;
672
673 if (local->hw.conf.flags & IEEE80211_CONF_PS)
674 return;
675
676 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
677 (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
678 ieee80211_send_nullfunc(local, sdata, 1);
679
680 if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
681 (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
682 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
683 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
684 local->hw.conf.flags |= IEEE80211_CONF_PS;
685 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
686 }
687 }
688
689 void ieee80211_dynamic_ps_timer(unsigned long data)
690 {
691 struct ieee80211_local *local = (void *) data;
692
693 if (local->quiescing || local->suspended)
694 return;
695
696 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
697 }
698
699 /* MLME */
700 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
701 struct ieee80211_if_managed *ifmgd,
702 u8 *wmm_param, size_t wmm_param_len)
703 {
704 struct ieee80211_tx_queue_params params;
705 size_t left;
706 int count;
707 u8 *pos, uapsd_queues = 0;
708
709 if (!local->ops->conf_tx)
710 return;
711
712 if (local->hw.queues < 4)
713 return;
714
715 if (!wmm_param)
716 return;
717
718 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
719 return;
720
721 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
722 uapsd_queues = local->uapsd_queues;
723
724 count = wmm_param[6] & 0x0f;
725 if (count == ifmgd->wmm_last_param_set)
726 return;
727 ifmgd->wmm_last_param_set = count;
728
729 pos = wmm_param + 8;
730 left = wmm_param_len - 8;
731
732 memset(&params, 0, sizeof(params));
733
734 local->wmm_acm = 0;
735 for (; left >= 4; left -= 4, pos += 4) {
736 int aci = (pos[0] >> 5) & 0x03;
737 int acm = (pos[0] >> 4) & 0x01;
738 bool uapsd = false;
739 int queue;
740
741 switch (aci) {
742 case 1: /* AC_BK */
743 queue = 3;
744 if (acm)
745 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
746 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
747 uapsd = true;
748 break;
749 case 2: /* AC_VI */
750 queue = 1;
751 if (acm)
752 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
753 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
754 uapsd = true;
755 break;
756 case 3: /* AC_VO */
757 queue = 0;
758 if (acm)
759 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
760 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
761 uapsd = true;
762 break;
763 case 0: /* AC_BE */
764 default:
765 queue = 2;
766 if (acm)
767 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
768 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
769 uapsd = true;
770 break;
771 }
772
773 params.aifs = pos[0] & 0x0f;
774 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
775 params.cw_min = ecw2cw(pos[1] & 0x0f);
776 params.txop = get_unaligned_le16(pos + 2);
777 params.uapsd = uapsd;
778
779 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
780 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
781 "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
782 wiphy_name(local->hw.wiphy), queue, aci, acm,
783 params.aifs, params.cw_min, params.cw_max, params.txop,
784 params.uapsd);
785 #endif
786 if (drv_conf_tx(local, queue, &params))
787 printk(KERN_DEBUG "%s: failed to set TX queue "
788 "parameters for queue %d\n",
789 wiphy_name(local->hw.wiphy), queue);
790 }
791
792 /* enable WMM or activate new settings */
793 local->hw.conf.flags |= IEEE80211_CONF_QOS;
794 drv_config(local, IEEE80211_CONF_CHANGE_QOS);
795 }
796
797 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
798 u16 capab, bool erp_valid, u8 erp)
799 {
800 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
801 u32 changed = 0;
802 bool use_protection;
803 bool use_short_preamble;
804 bool use_short_slot;
805
806 if (erp_valid) {
807 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
808 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
809 } else {
810 use_protection = false;
811 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
812 }
813
814 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
815 if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
816 use_short_slot = true;
817
818 if (use_protection != bss_conf->use_cts_prot) {
819 bss_conf->use_cts_prot = use_protection;
820 changed |= BSS_CHANGED_ERP_CTS_PROT;
821 }
822
823 if (use_short_preamble != bss_conf->use_short_preamble) {
824 bss_conf->use_short_preamble = use_short_preamble;
825 changed |= BSS_CHANGED_ERP_PREAMBLE;
826 }
827
828 if (use_short_slot != bss_conf->use_short_slot) {
829 bss_conf->use_short_slot = use_short_slot;
830 changed |= BSS_CHANGED_ERP_SLOT;
831 }
832
833 return changed;
834 }
835
836 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
837 struct cfg80211_bss *cbss,
838 u32 bss_info_changed)
839 {
840 struct ieee80211_bss *bss = (void *)cbss->priv;
841 struct ieee80211_local *local = sdata->local;
842 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
843
844 bss_info_changed |= BSS_CHANGED_ASSOC;
845 /* set timing information */
846 bss_conf->beacon_int = cbss->beacon_interval;
847 bss_conf->timestamp = cbss->tsf;
848
849 bss_info_changed |= BSS_CHANGED_BEACON_INT;
850 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
851 cbss->capability, bss->has_erp_value, bss->erp_value);
852
853 sdata->u.mgd.associated = cbss;
854 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
855
856 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
857
858 /* just to be sure */
859 sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
860 IEEE80211_STA_BEACON_POLL);
861
862 /*
863 * Always handle WMM once after association regardless
864 * of the first value the AP uses. Setting -1 here has
865 * that effect because the AP values is an unsigned
866 * 4-bit value.
867 */
868 sdata->u.mgd.wmm_last_param_set = -1;
869
870 ieee80211_led_assoc(local, 1);
871
872 bss_conf->assoc = 1;
873 /*
874 * For now just always ask the driver to update the basic rateset
875 * when we have associated, we aren't checking whether it actually
876 * changed or not.
877 */
878 bss_info_changed |= BSS_CHANGED_BASIC_RATES;
879
880 /* And the BSSID changed - we're associated now */
881 bss_info_changed |= BSS_CHANGED_BSSID;
882
883 /* Tell the driver to monitor connection quality (if supported) */
884 if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
885 bss_conf->cqm_rssi_thold)
886 bss_info_changed |= BSS_CHANGED_CQM;
887
888 /* Enable ARP filtering */
889 if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
890 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
891 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
892 }
893
894 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
895
896 mutex_lock(&local->iflist_mtx);
897 ieee80211_recalc_ps(local, -1);
898 ieee80211_recalc_smps(local, sdata);
899 mutex_unlock(&local->iflist_mtx);
900
901 netif_tx_start_all_queues(sdata->dev);
902 netif_carrier_on(sdata->dev);
903 }
904
905 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
906 bool remove_sta)
907 {
908 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
909 struct ieee80211_local *local = sdata->local;
910 struct sta_info *sta;
911 u32 changed = 0, config_changed = 0;
912 u8 bssid[ETH_ALEN];
913
914 ASSERT_MGD_MTX(ifmgd);
915
916 if (WARN_ON(!ifmgd->associated))
917 return;
918
919 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
920
921 ifmgd->associated = NULL;
922 memset(ifmgd->bssid, 0, ETH_ALEN);
923
924 /*
925 * we need to commit the associated = NULL change because the
926 * scan code uses that to determine whether this iface should
927 * go to/wake up from powersave or not -- and could otherwise
928 * wake the queues erroneously.
929 */
930 smp_mb();
931
932 /*
933 * Thus, we can only afterwards stop the queues -- to account
934 * for the case where another CPU is finishing a scan at this
935 * time -- we don't want the scan code to enable queues.
936 */
937
938 netif_tx_stop_all_queues(sdata->dev);
939 netif_carrier_off(sdata->dev);
940
941 mutex_lock(&local->sta_mtx);
942 sta = sta_info_get(sdata, bssid);
943 if (sta) {
944 set_sta_flags(sta, WLAN_STA_BLOCK_BA);
945 ieee80211_sta_tear_down_BA_sessions(sta);
946 }
947 mutex_unlock(&local->sta_mtx);
948
949 changed |= ieee80211_reset_erp_info(sdata);
950
951 ieee80211_led_assoc(local, 0);
952 changed |= BSS_CHANGED_ASSOC;
953 sdata->vif.bss_conf.assoc = false;
954
955 ieee80211_set_wmm_default(sdata);
956
957 /* channel(_type) changes are handled by ieee80211_hw_config */
958 WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
959
960 /* on the next assoc, re-program HT parameters */
961 sdata->ht_opmode_valid = false;
962
963 local->power_constr_level = 0;
964
965 del_timer_sync(&local->dynamic_ps_timer);
966 cancel_work_sync(&local->dynamic_ps_enable_work);
967
968 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
969 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
970 config_changed |= IEEE80211_CONF_CHANGE_PS;
971 }
972
973 ieee80211_hw_config(local, config_changed);
974
975 /* Disable ARP filtering */
976 if (sdata->vif.bss_conf.arp_filter_enabled) {
977 sdata->vif.bss_conf.arp_filter_enabled = false;
978 changed |= BSS_CHANGED_ARP_FILTER;
979 }
980
981 /* The BSSID (not really interesting) and HT changed */
982 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
983 ieee80211_bss_info_change_notify(sdata, changed);
984
985 if (remove_sta)
986 sta_info_destroy_addr(sdata, bssid);
987 }
988
989 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
990 struct ieee80211_hdr *hdr)
991 {
992 /*
993 * We can postpone the mgd.timer whenever receiving unicast frames
994 * from AP because we know that the connection is working both ways
995 * at that time. But multicast frames (and hence also beacons) must
996 * be ignored here, because we need to trigger the timer during
997 * data idle periods for sending the periodic probe request to the
998 * AP we're connected to.
999 */
1000 if (is_multicast_ether_addr(hdr->addr1))
1001 return;
1002
1003 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1004 return;
1005
1006 mod_timer(&sdata->u.mgd.conn_mon_timer,
1007 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
1008 }
1009
1010 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1011 {
1012 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1013 const u8 *ssid;
1014
1015 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1016 ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
1017 ssid + 2, ssid[1], NULL, 0);
1018
1019 ifmgd->probe_send_count++;
1020 ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
1021 run_again(ifmgd, ifmgd->probe_timeout);
1022 }
1023
1024 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1025 bool beacon)
1026 {
1027 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1028 bool already = false;
1029
1030 if (!ieee80211_sdata_running(sdata))
1031 return;
1032
1033 if (sdata->local->scanning)
1034 return;
1035
1036 if (sdata->local->tmp_channel)
1037 return;
1038
1039 mutex_lock(&ifmgd->mtx);
1040
1041 if (!ifmgd->associated)
1042 goto out;
1043
1044 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1045 if (beacon && net_ratelimit())
1046 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1047 "- sending probe request\n", sdata->name);
1048 #endif
1049
1050 /*
1051 * The driver/our work has already reported this event or the
1052 * connection monitoring has kicked in and we have already sent
1053 * a probe request. Or maybe the AP died and the driver keeps
1054 * reporting until we disassociate...
1055 *
1056 * In either case we have to ignore the current call to this
1057 * function (except for setting the correct probe reason bit)
1058 * because otherwise we would reset the timer every time and
1059 * never check whether we received a probe response!
1060 */
1061 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1062 IEEE80211_STA_CONNECTION_POLL))
1063 already = true;
1064
1065 if (beacon)
1066 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1067 else
1068 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1069
1070 if (already)
1071 goto out;
1072
1073 mutex_lock(&sdata->local->iflist_mtx);
1074 ieee80211_recalc_ps(sdata->local, -1);
1075 mutex_unlock(&sdata->local->iflist_mtx);
1076
1077 ifmgd->probe_send_count = 0;
1078 ieee80211_mgd_probe_ap_send(sdata);
1079 out:
1080 mutex_unlock(&ifmgd->mtx);
1081 }
1082
1083 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1084 {
1085 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1086 struct ieee80211_local *local = sdata->local;
1087 u8 bssid[ETH_ALEN];
1088
1089 mutex_lock(&ifmgd->mtx);
1090 if (!ifmgd->associated) {
1091 mutex_unlock(&ifmgd->mtx);
1092 return;
1093 }
1094
1095 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1096
1097 printk(KERN_DEBUG "Connection to AP %pM lost.\n", bssid);
1098
1099 ieee80211_set_disassoc(sdata, true);
1100 ieee80211_recalc_idle(local);
1101 mutex_unlock(&ifmgd->mtx);
1102 /*
1103 * must be outside lock due to cfg80211,
1104 * but that's not a problem.
1105 */
1106 ieee80211_send_deauth_disassoc(sdata, bssid,
1107 IEEE80211_STYPE_DEAUTH,
1108 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1109 NULL, true);
1110 }
1111
1112 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1113 {
1114 struct ieee80211_sub_if_data *sdata =
1115 container_of(work, struct ieee80211_sub_if_data,
1116 u.mgd.beacon_connection_loss_work);
1117
1118 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1119 __ieee80211_connection_loss(sdata);
1120 else
1121 ieee80211_mgd_probe_ap(sdata, true);
1122 }
1123
1124 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1125 {
1126 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1127 struct ieee80211_hw *hw = &sdata->local->hw;
1128
1129 trace_api_beacon_loss(sdata);
1130
1131 WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1132 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1133 }
1134 EXPORT_SYMBOL(ieee80211_beacon_loss);
1135
1136 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1137 {
1138 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1139 struct ieee80211_hw *hw = &sdata->local->hw;
1140
1141 trace_api_connection_loss(sdata);
1142
1143 WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1144 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1145 }
1146 EXPORT_SYMBOL(ieee80211_connection_loss);
1147
1148
1149 static enum rx_mgmt_action __must_check
1150 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1151 struct ieee80211_mgmt *mgmt, size_t len)
1152 {
1153 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1154 const u8 *bssid = NULL;
1155 u16 reason_code;
1156
1157 if (len < 24 + 2)
1158 return RX_MGMT_NONE;
1159
1160 ASSERT_MGD_MTX(ifmgd);
1161
1162 bssid = ifmgd->associated->bssid;
1163
1164 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1165
1166 printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1167 sdata->name, bssid, reason_code);
1168
1169 ieee80211_set_disassoc(sdata, true);
1170 ieee80211_recalc_idle(sdata->local);
1171
1172 return RX_MGMT_CFG80211_DEAUTH;
1173 }
1174
1175
1176 static enum rx_mgmt_action __must_check
1177 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1178 struct ieee80211_mgmt *mgmt, size_t len)
1179 {
1180 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1181 u16 reason_code;
1182
1183 if (len < 24 + 2)
1184 return RX_MGMT_NONE;
1185
1186 ASSERT_MGD_MTX(ifmgd);
1187
1188 if (WARN_ON(!ifmgd->associated))
1189 return RX_MGMT_NONE;
1190
1191 if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1192 return RX_MGMT_NONE;
1193
1194 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1195
1196 printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1197 sdata->name, mgmt->sa, reason_code);
1198
1199 ieee80211_set_disassoc(sdata, true);
1200 ieee80211_recalc_idle(sdata->local);
1201 return RX_MGMT_CFG80211_DISASSOC;
1202 }
1203
1204
1205 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1206 struct ieee80211_mgmt *mgmt, size_t len)
1207 {
1208 struct ieee80211_sub_if_data *sdata = wk->sdata;
1209 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1210 struct ieee80211_local *local = sdata->local;
1211 struct ieee80211_supported_band *sband;
1212 struct sta_info *sta;
1213 struct cfg80211_bss *cbss = wk->assoc.bss;
1214 u8 *pos;
1215 u32 rates, basic_rates;
1216 u16 capab_info, aid;
1217 struct ieee802_11_elems elems;
1218 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1219 u32 changed = 0;
1220 int i, j, err;
1221 bool have_higher_than_11mbit = false;
1222 u16 ap_ht_cap_flags;
1223
1224 /* AssocResp and ReassocResp have identical structure */
1225
1226 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1227 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1228
1229 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1230 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1231 "set\n", sdata->name, aid);
1232 aid &= ~(BIT(15) | BIT(14));
1233
1234 pos = mgmt->u.assoc_resp.variable;
1235 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1236
1237 if (!elems.supp_rates) {
1238 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1239 sdata->name);
1240 return false;
1241 }
1242
1243 ifmgd->aid = aid;
1244
1245 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1246 if (!sta) {
1247 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1248 " the AP\n", sdata->name);
1249 return false;
1250 }
1251
1252 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1253 WLAN_STA_ASSOC_AP);
1254 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1255 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1256
1257 rates = 0;
1258 basic_rates = 0;
1259 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1260
1261 for (i = 0; i < elems.supp_rates_len; i++) {
1262 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1263 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1264
1265 if (rate > 110)
1266 have_higher_than_11mbit = true;
1267
1268 for (j = 0; j < sband->n_bitrates; j++) {
1269 if (sband->bitrates[j].bitrate == rate) {
1270 rates |= BIT(j);
1271 if (is_basic)
1272 basic_rates |= BIT(j);
1273 break;
1274 }
1275 }
1276 }
1277
1278 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1279 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1280 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1281
1282 if (rate > 110)
1283 have_higher_than_11mbit = true;
1284
1285 for (j = 0; j < sband->n_bitrates; j++) {
1286 if (sband->bitrates[j].bitrate == rate) {
1287 rates |= BIT(j);
1288 if (is_basic)
1289 basic_rates |= BIT(j);
1290 break;
1291 }
1292 }
1293 }
1294
1295 sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1296 sdata->vif.bss_conf.basic_rates = basic_rates;
1297
1298 /* cf. IEEE 802.11 9.2.12 */
1299 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1300 have_higher_than_11mbit)
1301 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1302 else
1303 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1304
1305 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1306 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1307 elems.ht_cap_elem, &sta->sta.ht_cap);
1308
1309 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1310
1311 rate_control_rate_init(sta);
1312
1313 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1314 set_sta_flags(sta, WLAN_STA_MFP);
1315
1316 if (elems.wmm_param)
1317 set_sta_flags(sta, WLAN_STA_WME);
1318
1319 err = sta_info_insert(sta);
1320 sta = NULL;
1321 if (err) {
1322 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1323 " the AP (error %d)\n", sdata->name, err);
1324 return false;
1325 }
1326
1327 if (elems.wmm_param)
1328 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1329 elems.wmm_param_len);
1330 else
1331 ieee80211_set_wmm_default(sdata);
1332
1333 local->oper_channel = wk->chan;
1334
1335 if (elems.ht_info_elem && elems.wmm_param &&
1336 (sdata->local->hw.queues >= 4) &&
1337 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1338 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1339 cbss->bssid, ap_ht_cap_flags);
1340
1341 /* set AID and assoc capability,
1342 * ieee80211_set_associated() will tell the driver */
1343 bss_conf->aid = aid;
1344 bss_conf->assoc_capability = capab_info;
1345 ieee80211_set_associated(sdata, cbss, changed);
1346
1347 /*
1348 * If we're using 4-addr mode, let the AP know that we're
1349 * doing so, so that it can create the STA VLAN on its side
1350 */
1351 if (ifmgd->use_4addr)
1352 ieee80211_send_4addr_nullfunc(local, sdata);
1353
1354 /*
1355 * Start timer to probe the connection to the AP now.
1356 * Also start the timer that will detect beacon loss.
1357 */
1358 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1359 mod_beacon_timer(sdata);
1360
1361 return true;
1362 }
1363
1364
1365 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1366 struct ieee80211_mgmt *mgmt,
1367 size_t len,
1368 struct ieee80211_rx_status *rx_status,
1369 struct ieee802_11_elems *elems,
1370 bool beacon)
1371 {
1372 struct ieee80211_local *local = sdata->local;
1373 int freq;
1374 struct ieee80211_bss *bss;
1375 struct ieee80211_channel *channel;
1376 bool need_ps = false;
1377
1378 if (sdata->u.mgd.associated) {
1379 bss = (void *)sdata->u.mgd.associated->priv;
1380 /* not previously set so we may need to recalc */
1381 need_ps = !bss->dtim_period;
1382 }
1383
1384 if (elems->ds_params && elems->ds_params_len == 1)
1385 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1386 else
1387 freq = rx_status->freq;
1388
1389 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1390
1391 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1392 return;
1393
1394 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1395 channel, beacon);
1396 if (bss)
1397 ieee80211_rx_bss_put(local, bss);
1398
1399 if (!sdata->u.mgd.associated)
1400 return;
1401
1402 if (need_ps) {
1403 mutex_lock(&local->iflist_mtx);
1404 ieee80211_recalc_ps(local, -1);
1405 mutex_unlock(&local->iflist_mtx);
1406 }
1407
1408 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1409 (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1410 ETH_ALEN) == 0)) {
1411 struct ieee80211_channel_sw_ie *sw_elem =
1412 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1413 ieee80211_sta_process_chanswitch(sdata, sw_elem,
1414 bss, rx_status->mactime);
1415 }
1416 }
1417
1418
1419 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1420 struct sk_buff *skb)
1421 {
1422 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1423 struct ieee80211_if_managed *ifmgd;
1424 struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1425 size_t baselen, len = skb->len;
1426 struct ieee802_11_elems elems;
1427
1428 ifmgd = &sdata->u.mgd;
1429
1430 ASSERT_MGD_MTX(ifmgd);
1431
1432 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1433 return; /* ignore ProbeResp to foreign address */
1434
1435 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1436 if (baselen > len)
1437 return;
1438
1439 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1440 &elems);
1441
1442 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1443
1444 if (ifmgd->associated &&
1445 memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1446 ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1447 IEEE80211_STA_CONNECTION_POLL)) {
1448 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1449 IEEE80211_STA_BEACON_POLL);
1450 mutex_lock(&sdata->local->iflist_mtx);
1451 ieee80211_recalc_ps(sdata->local, -1);
1452 mutex_unlock(&sdata->local->iflist_mtx);
1453
1454 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1455 return;
1456
1457 /*
1458 * We've received a probe response, but are not sure whether
1459 * we have or will be receiving any beacons or data, so let's
1460 * schedule the timers again, just in case.
1461 */
1462 mod_beacon_timer(sdata);
1463
1464 mod_timer(&ifmgd->conn_mon_timer,
1465 round_jiffies_up(jiffies +
1466 IEEE80211_CONNECTION_IDLE_TIME));
1467 }
1468 }
1469
1470 /*
1471 * This is the canonical list of information elements we care about,
1472 * the filter code also gives us all changes to the Microsoft OUI
1473 * (00:50:F2) vendor IE which is used for WMM which we need to track.
1474 *
1475 * We implement beacon filtering in software since that means we can
1476 * avoid processing the frame here and in cfg80211, and userspace
1477 * will not be able to tell whether the hardware supports it or not.
1478 *
1479 * XXX: This list needs to be dynamic -- userspace needs to be able to
1480 * add items it requires. It also needs to be able to tell us to
1481 * look out for other vendor IEs.
1482 */
1483 static const u64 care_about_ies =
1484 (1ULL << WLAN_EID_COUNTRY) |
1485 (1ULL << WLAN_EID_ERP_INFO) |
1486 (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1487 (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1488 (1ULL << WLAN_EID_HT_CAPABILITY) |
1489 (1ULL << WLAN_EID_HT_INFORMATION);
1490
1491 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1492 struct ieee80211_mgmt *mgmt,
1493 size_t len,
1494 struct ieee80211_rx_status *rx_status)
1495 {
1496 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1497 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1498 size_t baselen;
1499 struct ieee802_11_elems elems;
1500 struct ieee80211_local *local = sdata->local;
1501 u32 changed = 0;
1502 bool erp_valid, directed_tim = false;
1503 u8 erp_value = 0;
1504 u32 ncrc;
1505 u8 *bssid;
1506
1507 ASSERT_MGD_MTX(ifmgd);
1508
1509 /* Process beacon from the current BSS */
1510 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1511 if (baselen > len)
1512 return;
1513
1514 if (rx_status->freq != local->hw.conf.channel->center_freq)
1515 return;
1516
1517 /*
1518 * We might have received a number of frames, among them a
1519 * disassoc frame and a beacon...
1520 */
1521 if (!ifmgd->associated)
1522 return;
1523
1524 bssid = ifmgd->associated->bssid;
1525
1526 /*
1527 * And in theory even frames from a different AP we were just
1528 * associated to a split-second ago!
1529 */
1530 if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1531 return;
1532
1533 /* Track average RSSI from the Beacon frames of the current AP */
1534 ifmgd->last_beacon_signal = rx_status->signal;
1535 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1536 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1537 ifmgd->ave_beacon_signal = rx_status->signal;
1538 ifmgd->last_cqm_event_signal = 0;
1539 } else {
1540 ifmgd->ave_beacon_signal =
1541 (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1542 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1543 ifmgd->ave_beacon_signal) / 16;
1544 }
1545 if (bss_conf->cqm_rssi_thold &&
1546 !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1547 int sig = ifmgd->ave_beacon_signal / 16;
1548 int last_event = ifmgd->last_cqm_event_signal;
1549 int thold = bss_conf->cqm_rssi_thold;
1550 int hyst = bss_conf->cqm_rssi_hyst;
1551 if (sig < thold &&
1552 (last_event == 0 || sig < last_event - hyst)) {
1553 ifmgd->last_cqm_event_signal = sig;
1554 ieee80211_cqm_rssi_notify(
1555 &sdata->vif,
1556 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1557 GFP_KERNEL);
1558 } else if (sig > thold &&
1559 (last_event == 0 || sig > last_event + hyst)) {
1560 ifmgd->last_cqm_event_signal = sig;
1561 ieee80211_cqm_rssi_notify(
1562 &sdata->vif,
1563 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1564 GFP_KERNEL);
1565 }
1566 }
1567
1568 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1569 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1570 if (net_ratelimit()) {
1571 printk(KERN_DEBUG "%s: cancelling probereq poll due "
1572 "to a received beacon\n", sdata->name);
1573 }
1574 #endif
1575 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1576 mutex_lock(&local->iflist_mtx);
1577 ieee80211_recalc_ps(local, -1);
1578 mutex_unlock(&local->iflist_mtx);
1579 }
1580
1581 /*
1582 * Push the beacon loss detection into the future since
1583 * we are processing a beacon from the AP just now.
1584 */
1585 mod_beacon_timer(sdata);
1586
1587 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1588 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1589 len - baselen, &elems,
1590 care_about_ies, ncrc);
1591
1592 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1593 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1594 ifmgd->aid);
1595
1596 if (ncrc != ifmgd->beacon_crc) {
1597 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1598 true);
1599
1600 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1601 elems.wmm_param_len);
1602 }
1603
1604 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1605 if (directed_tim) {
1606 if (local->hw.conf.dynamic_ps_timeout > 0) {
1607 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1608 ieee80211_hw_config(local,
1609 IEEE80211_CONF_CHANGE_PS);
1610 ieee80211_send_nullfunc(local, sdata, 0);
1611 } else {
1612 local->pspolling = true;
1613
1614 /*
1615 * Here is assumed that the driver will be
1616 * able to send ps-poll frame and receive a
1617 * response even though power save mode is
1618 * enabled, but some drivers might require
1619 * to disable power save here. This needs
1620 * to be investigated.
1621 */
1622 ieee80211_send_pspoll(local, sdata);
1623 }
1624 }
1625 }
1626
1627 if (ncrc == ifmgd->beacon_crc)
1628 return;
1629 ifmgd->beacon_crc = ncrc;
1630
1631 if (elems.erp_info && elems.erp_info_len >= 1) {
1632 erp_valid = true;
1633 erp_value = elems.erp_info[0];
1634 } else {
1635 erp_valid = false;
1636 }
1637 changed |= ieee80211_handle_bss_capability(sdata,
1638 le16_to_cpu(mgmt->u.beacon.capab_info),
1639 erp_valid, erp_value);
1640
1641
1642 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1643 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1644 struct sta_info *sta;
1645 struct ieee80211_supported_band *sband;
1646 u16 ap_ht_cap_flags;
1647
1648 rcu_read_lock();
1649
1650 sta = sta_info_get(sdata, bssid);
1651 if (WARN_ON(!sta)) {
1652 rcu_read_unlock();
1653 return;
1654 }
1655
1656 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1657
1658 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1659 elems.ht_cap_elem, &sta->sta.ht_cap);
1660
1661 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1662
1663 rcu_read_unlock();
1664
1665 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1666 bssid, ap_ht_cap_flags);
1667 }
1668
1669 /* Note: country IE parsing is done for us by cfg80211 */
1670 if (elems.country_elem) {
1671 /* TODO: IBSS also needs this */
1672 if (elems.pwr_constr_elem)
1673 ieee80211_handle_pwr_constr(sdata,
1674 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1675 elems.pwr_constr_elem,
1676 elems.pwr_constr_elem_len);
1677 }
1678
1679 ieee80211_bss_info_change_notify(sdata, changed);
1680 }
1681
1682 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1683 struct sk_buff *skb)
1684 {
1685 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1686 struct ieee80211_rx_status *rx_status;
1687 struct ieee80211_mgmt *mgmt;
1688 enum rx_mgmt_action rma = RX_MGMT_NONE;
1689 u16 fc;
1690
1691 rx_status = (struct ieee80211_rx_status *) skb->cb;
1692 mgmt = (struct ieee80211_mgmt *) skb->data;
1693 fc = le16_to_cpu(mgmt->frame_control);
1694
1695 mutex_lock(&ifmgd->mtx);
1696
1697 if (ifmgd->associated &&
1698 memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1699 switch (fc & IEEE80211_FCTL_STYPE) {
1700 case IEEE80211_STYPE_BEACON:
1701 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1702 rx_status);
1703 break;
1704 case IEEE80211_STYPE_PROBE_RESP:
1705 ieee80211_rx_mgmt_probe_resp(sdata, skb);
1706 break;
1707 case IEEE80211_STYPE_DEAUTH:
1708 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1709 break;
1710 case IEEE80211_STYPE_DISASSOC:
1711 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1712 break;
1713 case IEEE80211_STYPE_ACTION:
1714 switch (mgmt->u.action.category) {
1715 case WLAN_CATEGORY_SPECTRUM_MGMT:
1716 ieee80211_sta_process_chanswitch(sdata,
1717 &mgmt->u.action.u.chan_switch.sw_elem,
1718 (void *)ifmgd->associated->priv,
1719 rx_status->mactime);
1720 break;
1721 }
1722 }
1723 mutex_unlock(&ifmgd->mtx);
1724
1725 switch (rma) {
1726 case RX_MGMT_NONE:
1727 /* no action */
1728 break;
1729 case RX_MGMT_CFG80211_DEAUTH:
1730 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1731 break;
1732 case RX_MGMT_CFG80211_DISASSOC:
1733 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1734 break;
1735 default:
1736 WARN(1, "unexpected: %d", rma);
1737 }
1738 return;
1739 }
1740
1741 mutex_unlock(&ifmgd->mtx);
1742
1743 if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1744 (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) {
1745 struct ieee80211_local *local = sdata->local;
1746 struct ieee80211_work *wk;
1747
1748 mutex_lock(&local->work_mtx);
1749 list_for_each_entry(wk, &local->work_list, list) {
1750 if (wk->sdata != sdata)
1751 continue;
1752
1753 if (wk->type != IEEE80211_WORK_ASSOC)
1754 continue;
1755
1756 if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN))
1757 continue;
1758 if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN))
1759 continue;
1760
1761 /*
1762 * Printing the message only here means we can't
1763 * spuriously print it, but it also means that it
1764 * won't be printed when the frame comes in before
1765 * we even tried to associate or in similar cases.
1766 *
1767 * Ultimately, I suspect cfg80211 should print the
1768 * messages instead.
1769 */
1770 printk(KERN_DEBUG
1771 "%s: deauthenticated from %pM (Reason: %u)\n",
1772 sdata->name, mgmt->bssid,
1773 le16_to_cpu(mgmt->u.deauth.reason_code));
1774
1775 list_del_rcu(&wk->list);
1776 free_work(wk);
1777 break;
1778 }
1779 mutex_unlock(&local->work_mtx);
1780
1781 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1782 }
1783 }
1784
1785 static void ieee80211_sta_timer(unsigned long data)
1786 {
1787 struct ieee80211_sub_if_data *sdata =
1788 (struct ieee80211_sub_if_data *) data;
1789 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1790 struct ieee80211_local *local = sdata->local;
1791
1792 if (local->quiescing) {
1793 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1794 return;
1795 }
1796
1797 ieee80211_queue_work(&local->hw, &sdata->work);
1798 }
1799
1800 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
1801 {
1802 struct ieee80211_local *local = sdata->local;
1803 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1804
1805 /* then process the rest of the work */
1806 mutex_lock(&ifmgd->mtx);
1807
1808 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1809 IEEE80211_STA_CONNECTION_POLL) &&
1810 ifmgd->associated) {
1811 u8 bssid[ETH_ALEN];
1812
1813 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1814 if (time_is_after_jiffies(ifmgd->probe_timeout))
1815 run_again(ifmgd, ifmgd->probe_timeout);
1816
1817 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1818 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1819 printk(KERN_DEBUG "No probe response from AP %pM"
1820 " after %dms, try %d\n", bssid,
1821 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1822 ifmgd->probe_send_count);
1823 #endif
1824 ieee80211_mgd_probe_ap_send(sdata);
1825 } else {
1826 /*
1827 * We actually lost the connection ... or did we?
1828 * Let's make sure!
1829 */
1830 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1831 IEEE80211_STA_BEACON_POLL);
1832 printk(KERN_DEBUG "No probe response from AP %pM"
1833 " after %dms, disconnecting.\n",
1834 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1835 ieee80211_set_disassoc(sdata, true);
1836 ieee80211_recalc_idle(local);
1837 mutex_unlock(&ifmgd->mtx);
1838 /*
1839 * must be outside lock due to cfg80211,
1840 * but that's not a problem.
1841 */
1842 ieee80211_send_deauth_disassoc(sdata, bssid,
1843 IEEE80211_STYPE_DEAUTH,
1844 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1845 NULL, true);
1846 mutex_lock(&ifmgd->mtx);
1847 }
1848 }
1849
1850 mutex_unlock(&ifmgd->mtx);
1851 }
1852
1853 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1854 {
1855 struct ieee80211_sub_if_data *sdata =
1856 (struct ieee80211_sub_if_data *) data;
1857 struct ieee80211_local *local = sdata->local;
1858
1859 if (local->quiescing)
1860 return;
1861
1862 ieee80211_queue_work(&sdata->local->hw,
1863 &sdata->u.mgd.beacon_connection_loss_work);
1864 }
1865
1866 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1867 {
1868 struct ieee80211_sub_if_data *sdata =
1869 (struct ieee80211_sub_if_data *) data;
1870 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1871 struct ieee80211_local *local = sdata->local;
1872
1873 if (local->quiescing)
1874 return;
1875
1876 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1877 }
1878
1879 static void ieee80211_sta_monitor_work(struct work_struct *work)
1880 {
1881 struct ieee80211_sub_if_data *sdata =
1882 container_of(work, struct ieee80211_sub_if_data,
1883 u.mgd.monitor_work);
1884
1885 ieee80211_mgd_probe_ap(sdata, false);
1886 }
1887
1888 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1889 {
1890 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1891 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1892 IEEE80211_STA_CONNECTION_POLL);
1893
1894 /* let's probe the connection once */
1895 ieee80211_queue_work(&sdata->local->hw,
1896 &sdata->u.mgd.monitor_work);
1897 /* and do all the other regular work too */
1898 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1899 }
1900 }
1901
1902 #ifdef CONFIG_PM
1903 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1904 {
1905 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1906
1907 /*
1908 * we need to use atomic bitops for the running bits
1909 * only because both timers might fire at the same
1910 * time -- the code here is properly synchronised.
1911 */
1912
1913 cancel_work_sync(&ifmgd->beacon_connection_loss_work);
1914 if (del_timer_sync(&ifmgd->timer))
1915 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1916
1917 cancel_work_sync(&ifmgd->chswitch_work);
1918 if (del_timer_sync(&ifmgd->chswitch_timer))
1919 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1920
1921 cancel_work_sync(&ifmgd->monitor_work);
1922 /* these will just be re-established on connection */
1923 del_timer_sync(&ifmgd->conn_mon_timer);
1924 del_timer_sync(&ifmgd->bcn_mon_timer);
1925 }
1926
1927 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1928 {
1929 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1930
1931 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1932 add_timer(&ifmgd->timer);
1933 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1934 add_timer(&ifmgd->chswitch_timer);
1935 }
1936 #endif
1937
1938 /* interface setup */
1939 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1940 {
1941 struct ieee80211_if_managed *ifmgd;
1942
1943 ifmgd = &sdata->u.mgd;
1944 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1945 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1946 INIT_WORK(&ifmgd->beacon_connection_loss_work,
1947 ieee80211_beacon_connection_loss_work);
1948 setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1949 (unsigned long) sdata);
1950 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1951 (unsigned long) sdata);
1952 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1953 (unsigned long) sdata);
1954 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1955 (unsigned long) sdata);
1956
1957 ifmgd->flags = 0;
1958
1959 mutex_init(&ifmgd->mtx);
1960
1961 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1962 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1963 else
1964 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1965 }
1966
1967 /* scan finished notification */
1968 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1969 {
1970 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1971
1972 /* Restart STA timers */
1973 rcu_read_lock();
1974 list_for_each_entry_rcu(sdata, &local->interfaces, list)
1975 ieee80211_restart_sta_timer(sdata);
1976 rcu_read_unlock();
1977 }
1978
1979 int ieee80211_max_network_latency(struct notifier_block *nb,
1980 unsigned long data, void *dummy)
1981 {
1982 s32 latency_usec = (s32) data;
1983 struct ieee80211_local *local =
1984 container_of(nb, struct ieee80211_local,
1985 network_latency_notifier);
1986
1987 mutex_lock(&local->iflist_mtx);
1988 ieee80211_recalc_ps(local, latency_usec);
1989 mutex_unlock(&local->iflist_mtx);
1990
1991 return 0;
1992 }
1993
1994 /* config hooks */
1995 static enum work_done_result
1996 ieee80211_probe_auth_done(struct ieee80211_work *wk,
1997 struct sk_buff *skb)
1998 {
1999 if (!skb) {
2000 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
2001 return WORK_DONE_DESTROY;
2002 }
2003
2004 if (wk->type == IEEE80211_WORK_AUTH) {
2005 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
2006 return WORK_DONE_DESTROY;
2007 }
2008
2009 mutex_lock(&wk->sdata->u.mgd.mtx);
2010 ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
2011 mutex_unlock(&wk->sdata->u.mgd.mtx);
2012
2013 wk->type = IEEE80211_WORK_AUTH;
2014 wk->probe_auth.tries = 0;
2015 return WORK_DONE_REQUEUE;
2016 }
2017
2018 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2019 struct cfg80211_auth_request *req)
2020 {
2021 const u8 *ssid;
2022 struct ieee80211_work *wk;
2023 u16 auth_alg;
2024
2025 if (req->local_state_change)
2026 return 0; /* no need to update mac80211 state */
2027
2028 switch (req->auth_type) {
2029 case NL80211_AUTHTYPE_OPEN_SYSTEM:
2030 auth_alg = WLAN_AUTH_OPEN;
2031 break;
2032 case NL80211_AUTHTYPE_SHARED_KEY:
2033 auth_alg = WLAN_AUTH_SHARED_KEY;
2034 break;
2035 case NL80211_AUTHTYPE_FT:
2036 auth_alg = WLAN_AUTH_FT;
2037 break;
2038 case NL80211_AUTHTYPE_NETWORK_EAP:
2039 auth_alg = WLAN_AUTH_LEAP;
2040 break;
2041 default:
2042 return -EOPNOTSUPP;
2043 }
2044
2045 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2046 if (!wk)
2047 return -ENOMEM;
2048
2049 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2050
2051 if (req->ie && req->ie_len) {
2052 memcpy(wk->ie, req->ie, req->ie_len);
2053 wk->ie_len = req->ie_len;
2054 }
2055
2056 if (req->key && req->key_len) {
2057 wk->probe_auth.key_len = req->key_len;
2058 wk->probe_auth.key_idx = req->key_idx;
2059 memcpy(wk->probe_auth.key, req->key, req->key_len);
2060 }
2061
2062 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2063 memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
2064 wk->probe_auth.ssid_len = ssid[1];
2065
2066 wk->probe_auth.algorithm = auth_alg;
2067 wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
2068
2069 /* if we already have a probe, don't probe again */
2070 if (req->bss->proberesp_ies)
2071 wk->type = IEEE80211_WORK_AUTH;
2072 else
2073 wk->type = IEEE80211_WORK_DIRECT_PROBE;
2074 wk->chan = req->bss->channel;
2075 wk->sdata = sdata;
2076 wk->done = ieee80211_probe_auth_done;
2077
2078 ieee80211_add_work(wk);
2079 return 0;
2080 }
2081
2082 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
2083 struct sk_buff *skb)
2084 {
2085 struct ieee80211_mgmt *mgmt;
2086 u16 status;
2087
2088 if (!skb) {
2089 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
2090 return WORK_DONE_DESTROY;
2091 }
2092
2093 mgmt = (void *)skb->data;
2094 status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2095
2096 if (status == WLAN_STATUS_SUCCESS) {
2097 mutex_lock(&wk->sdata->u.mgd.mtx);
2098 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
2099 mutex_unlock(&wk->sdata->u.mgd.mtx);
2100 /* oops -- internal error -- send timeout for now */
2101 cfg80211_send_assoc_timeout(wk->sdata->dev,
2102 wk->filter_ta);
2103 return WORK_DONE_DESTROY;
2104 }
2105
2106 mutex_unlock(&wk->sdata->u.mgd.mtx);
2107 }
2108
2109 cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2110 return WORK_DONE_DESTROY;
2111 }
2112
2113 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2114 struct cfg80211_assoc_request *req)
2115 {
2116 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2117 struct ieee80211_bss *bss = (void *)req->bss->priv;
2118 struct ieee80211_work *wk;
2119 const u8 *ssid;
2120 int i;
2121
2122 mutex_lock(&ifmgd->mtx);
2123 if (ifmgd->associated) {
2124 if (!req->prev_bssid ||
2125 memcmp(req->prev_bssid, ifmgd->associated->bssid,
2126 ETH_ALEN)) {
2127 /*
2128 * We are already associated and the request was not a
2129 * reassociation request from the current BSS, so
2130 * reject it.
2131 */
2132 mutex_unlock(&ifmgd->mtx);
2133 return -EALREADY;
2134 }
2135
2136 /* Trying to reassociate - clear previous association state */
2137 ieee80211_set_disassoc(sdata, true);
2138 }
2139 mutex_unlock(&ifmgd->mtx);
2140
2141 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2142 if (!wk)
2143 return -ENOMEM;
2144
2145 ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2146 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2147
2148 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2149 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2150 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2151 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2152 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2153
2154
2155 if (req->ie && req->ie_len) {
2156 memcpy(wk->ie, req->ie, req->ie_len);
2157 wk->ie_len = req->ie_len;
2158 } else
2159 wk->ie_len = 0;
2160
2161 wk->assoc.bss = req->bss;
2162
2163 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2164
2165 /* new association always uses requested smps mode */
2166 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2167 if (ifmgd->powersave)
2168 ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2169 else
2170 ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2171 } else
2172 ifmgd->ap_smps = ifmgd->req_smps;
2173
2174 wk->assoc.smps = ifmgd->ap_smps;
2175 /*
2176 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2177 * We still associate in non-HT mode (11a/b/g) if any one of these
2178 * ciphers is configured as pairwise.
2179 * We can set this to true for non-11n hardware, that'll be checked
2180 * separately along with the peer capabilities.
2181 */
2182 wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2183 wk->assoc.capability = req->bss->capability;
2184 wk->assoc.wmm_used = bss->wmm_used;
2185 wk->assoc.supp_rates = bss->supp_rates;
2186 wk->assoc.supp_rates_len = bss->supp_rates_len;
2187 wk->assoc.ht_information_ie =
2188 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2189
2190 if (bss->wmm_used && bss->uapsd_supported &&
2191 (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2192 wk->assoc.uapsd_used = true;
2193 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2194 } else {
2195 wk->assoc.uapsd_used = false;
2196 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2197 }
2198
2199 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2200 memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2201 wk->assoc.ssid_len = ssid[1];
2202
2203 if (req->prev_bssid)
2204 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2205
2206 wk->type = IEEE80211_WORK_ASSOC;
2207 wk->chan = req->bss->channel;
2208 wk->sdata = sdata;
2209 wk->done = ieee80211_assoc_done;
2210
2211 if (req->use_mfp) {
2212 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2213 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2214 } else {
2215 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2216 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2217 }
2218
2219 if (req->crypto.control_port)
2220 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2221 else
2222 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2223
2224 ieee80211_add_work(wk);
2225 return 0;
2226 }
2227
2228 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2229 struct cfg80211_deauth_request *req,
2230 void *cookie)
2231 {
2232 struct ieee80211_local *local = sdata->local;
2233 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2234 struct ieee80211_work *wk;
2235 u8 bssid[ETH_ALEN];
2236 bool assoc_bss = false;
2237
2238 mutex_lock(&ifmgd->mtx);
2239
2240 memcpy(bssid, req->bss->bssid, ETH_ALEN);
2241 if (ifmgd->associated == req->bss) {
2242 ieee80211_set_disassoc(sdata, false);
2243 mutex_unlock(&ifmgd->mtx);
2244 assoc_bss = true;
2245 } else {
2246 bool not_auth_yet = false;
2247
2248 mutex_unlock(&ifmgd->mtx);
2249
2250 mutex_lock(&local->work_mtx);
2251 list_for_each_entry(wk, &local->work_list, list) {
2252 if (wk->sdata != sdata)
2253 continue;
2254
2255 if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2256 wk->type != IEEE80211_WORK_AUTH &&
2257 wk->type != IEEE80211_WORK_ASSOC)
2258 continue;
2259
2260 if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2261 continue;
2262
2263 not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2264 list_del_rcu(&wk->list);
2265 free_work(wk);
2266 break;
2267 }
2268 mutex_unlock(&local->work_mtx);
2269
2270 /*
2271 * If somebody requests authentication and we haven't
2272 * sent out an auth frame yet there's no need to send
2273 * out a deauth frame either. If the state was PROBE,
2274 * then this is the case. If it's AUTH we have sent a
2275 * frame, and if it's IDLE we have completed the auth
2276 * process already.
2277 */
2278 if (not_auth_yet) {
2279 __cfg80211_auth_canceled(sdata->dev, bssid);
2280 return 0;
2281 }
2282 }
2283
2284 printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2285 sdata->name, bssid, req->reason_code);
2286
2287 ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2288 req->reason_code, cookie,
2289 !req->local_state_change);
2290 if (assoc_bss)
2291 sta_info_destroy_addr(sdata, bssid);
2292
2293 ieee80211_recalc_idle(sdata->local);
2294
2295 return 0;
2296 }
2297
2298 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2299 struct cfg80211_disassoc_request *req,
2300 void *cookie)
2301 {
2302 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2303 u8 bssid[ETH_ALEN];
2304
2305 mutex_lock(&ifmgd->mtx);
2306
2307 /*
2308 * cfg80211 should catch this ... but it's racy since
2309 * we can receive a disassoc frame, process it, hand it
2310 * to cfg80211 while that's in a locked section already
2311 * trying to tell us that the user wants to disconnect.
2312 */
2313 if (ifmgd->associated != req->bss) {
2314 mutex_unlock(&ifmgd->mtx);
2315 return -ENOLINK;
2316 }
2317
2318 printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2319 sdata->name, req->bss->bssid, req->reason_code);
2320
2321 memcpy(bssid, req->bss->bssid, ETH_ALEN);
2322 ieee80211_set_disassoc(sdata, false);
2323
2324 mutex_unlock(&ifmgd->mtx);
2325
2326 ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2327 IEEE80211_STYPE_DISASSOC, req->reason_code,
2328 cookie, !req->local_state_change);
2329 sta_info_destroy_addr(sdata, bssid);
2330
2331 ieee80211_recalc_idle(sdata->local);
2332
2333 return 0;
2334 }
2335
2336 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2337 enum nl80211_cqm_rssi_threshold_event rssi_event,
2338 gfp_t gfp)
2339 {
2340 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2341
2342 trace_api_cqm_rssi_notify(sdata, rssi_event);
2343
2344 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2345 }
2346 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
Linux kernel - Deliverables
This page took 0.095647 seconds and 5 git commands to generate.