projects / deliverable / linux.git / blob
? search:


4c189d0be4a3ba526beb1290440def362c28aee5
[deliverable/linux.git] / net / mac80211 / mlme.c
1 /*
2 * BSS client mode implementation
3 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4 * Copyright 2004, Instant802 Networks, Inc.
5 * Copyright 2005, Devicescape Software, Inc.
6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14 #include <linux/delay.h>
15 #include <linux/if_ether.h>
16 #include <linux/skbuff.h>
17 #include <linux/if_arp.h>
18 #include <linux/etherdevice.h>
19 #include <linux/rtnetlink.h>
20 #include <linux/pm_qos_params.h>
21 #include <linux/crc32.h>
22 #include <net/mac80211.h>
23 #include <asm/unaligned.h>
24
25 #include "ieee80211_i.h"
26 #include "driver-ops.h"
27 #include "rate.h"
28 #include "led.h"
29
30 #define IEEE80211_MAX_PROBE_TRIES 5
31
32 /*
33 * beacon loss detection timeout
34 * XXX: should depend on beacon interval
35 */
36 #define IEEE80211_BEACON_LOSS_TIME (2 * HZ)
37 /*
38 * Time the connection can be idle before we probe
39 * it to see if we can still talk to the AP.
40 */
41 #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ)
42 /*
43 * Time we wait for a probe response after sending
44 * a probe request because of beacon loss or for
45 * checking the connection still works.
46 */
47 #define IEEE80211_PROBE_WAIT (HZ / 2)
48
49 /*
50 * Weight given to the latest Beacon frame when calculating average signal
51 * strength for Beacon frames received in the current BSS. This must be
52 * between 1 and 15.
53 */
54 #define IEEE80211_SIGNAL_AVE_WEIGHT 3
55
56 #define TMR_RUNNING_TIMER 0
57 #define TMR_RUNNING_CHANSW 1
58
59 /*
60 * All cfg80211 functions have to be called outside a locked
61 * section so that they can acquire a lock themselves... This
62 * is much simpler than queuing up things in cfg80211, but we
63 * do need some indirection for that here.
64 */
65 enum rx_mgmt_action {
66 /* no action required */
67 RX_MGMT_NONE,
68
69 /* caller must call cfg80211_send_rx_auth() */
70 RX_MGMT_CFG80211_AUTH,
71
72 /* caller must call cfg80211_send_rx_assoc() */
73 RX_MGMT_CFG80211_ASSOC,
74
75 /* caller must call cfg80211_send_deauth() */
76 RX_MGMT_CFG80211_DEAUTH,
77
78 /* caller must call cfg80211_send_disassoc() */
79 RX_MGMT_CFG80211_DISASSOC,
80
81 /* caller must tell cfg80211 about internal error */
82 RX_MGMT_CFG80211_ASSOC_ERROR,
83 };
84
85 /* utils */
86 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
87 {
88 WARN_ON(!mutex_is_locked(&ifmgd->mtx));
89 }
90
91 /*
92 * We can have multiple work items (and connection probing)
93 * scheduling this timer, but we need to take care to only
94 * reschedule it when it should fire _earlier_ than it was
95 * asked for before, or if it's not pending right now. This
96 * function ensures that. Note that it then is required to
97 * run this function for all timeouts after the first one
98 * has happened -- the work that runs from this timer will
99 * do that.
100 */
101 static void run_again(struct ieee80211_if_managed *ifmgd,
102 unsigned long timeout)
103 {
104 ASSERT_MGD_MTX(ifmgd);
105
106 if (!timer_pending(&ifmgd->timer) ||
107 time_before(timeout, ifmgd->timer.expires))
108 mod_timer(&ifmgd->timer, timeout);
109 }
110
111 static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata)
112 {
113 if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
114 return;
115
116 mod_timer(&sdata->u.mgd.bcn_mon_timer,
117 round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME));
118 }
119
120 static int ecw2cw(int ecw)
121 {
122 return (1 << ecw) - 1;
123 }
124
125 /*
126 * ieee80211_enable_ht should be called only after the operating band
127 * has been determined as ht configuration depends on the hw's
128 * HT abilities for a specific band.
129 */
130 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
131 struct ieee80211_ht_info *hti,
132 const u8 *bssid, u16 ap_ht_cap_flags)
133 {
134 struct ieee80211_local *local = sdata->local;
135 struct ieee80211_supported_band *sband;
136 struct sta_info *sta;
137 u32 changed = 0;
138 u16 ht_opmode;
139 bool enable_ht = true, ht_changed;
140 enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
141
142 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
143
144 /* HT is not supported */
145 if (!sband->ht_cap.ht_supported)
146 enable_ht = false;
147
148 /* check that channel matches the right operating channel */
149 if (local->hw.conf.channel->center_freq !=
150 ieee80211_channel_to_frequency(hti->control_chan))
151 enable_ht = false;
152
153 if (enable_ht) {
154 channel_type = NL80211_CHAN_HT20;
155
156 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
157 (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
158 (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
159 switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
160 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
161 if (!(local->hw.conf.channel->flags &
162 IEEE80211_CHAN_NO_HT40PLUS))
163 channel_type = NL80211_CHAN_HT40PLUS;
164 break;
165 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
166 if (!(local->hw.conf.channel->flags &
167 IEEE80211_CHAN_NO_HT40MINUS))
168 channel_type = NL80211_CHAN_HT40MINUS;
169 break;
170 }
171 }
172 }
173
174 ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
175 channel_type != local->hw.conf.channel_type;
176
177 local->oper_channel_type = channel_type;
178
179 if (ht_changed) {
180 /* channel_type change automatically detected */
181 ieee80211_hw_config(local, 0);
182
183 rcu_read_lock();
184 sta = sta_info_get(sdata, bssid);
185 if (sta)
186 rate_control_rate_update(local, sband, sta,
187 IEEE80211_RC_HT_CHANGED,
188 local->oper_channel_type);
189 rcu_read_unlock();
190 }
191
192 /* disable HT */
193 if (!enable_ht)
194 return 0;
195
196 ht_opmode = le16_to_cpu(hti->operation_mode);
197
198 /* if bss configuration changed store the new one */
199 if (!sdata->ht_opmode_valid ||
200 sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
201 changed |= BSS_CHANGED_HT;
202 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
203 sdata->ht_opmode_valid = true;
204 }
205
206 return changed;
207 }
208
209 /* frame sending functions */
210
211 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
212 const u8 *bssid, u16 stype, u16 reason,
213 void *cookie, bool send_frame)
214 {
215 struct ieee80211_local *local = sdata->local;
216 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
217 struct sk_buff *skb;
218 struct ieee80211_mgmt *mgmt;
219
220 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
221 if (!skb) {
222 printk(KERN_DEBUG "%s: failed to allocate buffer for "
223 "deauth/disassoc frame\n", sdata->name);
224 return;
225 }
226 skb_reserve(skb, local->hw.extra_tx_headroom);
227
228 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
229 memset(mgmt, 0, 24);
230 memcpy(mgmt->da, bssid, ETH_ALEN);
231 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
232 memcpy(mgmt->bssid, bssid, ETH_ALEN);
233 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
234 skb_put(skb, 2);
235 /* u.deauth.reason_code == u.disassoc.reason_code */
236 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
237
238 if (stype == IEEE80211_STYPE_DEAUTH)
239 if (cookie)
240 __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
241 else
242 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
243 else
244 if (cookie)
245 __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
246 else
247 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
248 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
249 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
250
251 if (send_frame)
252 ieee80211_tx_skb(sdata, skb);
253 else
254 kfree_skb(skb);
255 }
256
257 void ieee80211_send_pspoll(struct ieee80211_local *local,
258 struct ieee80211_sub_if_data *sdata)
259 {
260 struct ieee80211_pspoll *pspoll;
261 struct sk_buff *skb;
262
263 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
264 if (!skb)
265 return;
266
267 pspoll = (struct ieee80211_pspoll *) skb->data;
268 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
269
270 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
271 ieee80211_tx_skb(sdata, skb);
272 }
273
274 void ieee80211_send_nullfunc(struct ieee80211_local *local,
275 struct ieee80211_sub_if_data *sdata,
276 int powersave)
277 {
278 struct sk_buff *skb;
279 struct ieee80211_hdr_3addr *nullfunc;
280
281 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
282 if (!skb)
283 return;
284
285 nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
286 if (powersave)
287 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
288
289 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
290 ieee80211_tx_skb(sdata, skb);
291 }
292
293 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
294 struct ieee80211_sub_if_data *sdata)
295 {
296 struct sk_buff *skb;
297 struct ieee80211_hdr *nullfunc;
298 __le16 fc;
299
300 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
301 return;
302
303 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
304 if (!skb) {
305 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
306 "nullfunc frame\n", sdata->name);
307 return;
308 }
309 skb_reserve(skb, local->hw.extra_tx_headroom);
310
311 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
312 memset(nullfunc, 0, 30);
313 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
314 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
315 nullfunc->frame_control = fc;
316 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
317 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
318 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
319 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
320
321 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
322 ieee80211_tx_skb(sdata, skb);
323 }
324
325 /* spectrum management related things */
326 static void ieee80211_chswitch_work(struct work_struct *work)
327 {
328 struct ieee80211_sub_if_data *sdata =
329 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
330 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
331
332 if (!ieee80211_sdata_running(sdata))
333 return;
334
335 mutex_lock(&ifmgd->mtx);
336 if (!ifmgd->associated)
337 goto out;
338
339 sdata->local->oper_channel = sdata->local->csa_channel;
340 ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL);
341
342 /* XXX: shouldn't really modify cfg80211-owned data! */
343 ifmgd->associated->channel = sdata->local->oper_channel;
344
345 ieee80211_wake_queues_by_reason(&sdata->local->hw,
346 IEEE80211_QUEUE_STOP_REASON_CSA);
347 out:
348 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
349 mutex_unlock(&ifmgd->mtx);
350 }
351
352 static void ieee80211_chswitch_timer(unsigned long data)
353 {
354 struct ieee80211_sub_if_data *sdata =
355 (struct ieee80211_sub_if_data *) data;
356 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
357
358 if (sdata->local->quiescing) {
359 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
360 return;
361 }
362
363 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
364 }
365
366 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
367 struct ieee80211_channel_sw_ie *sw_elem,
368 struct ieee80211_bss *bss)
369 {
370 struct cfg80211_bss *cbss =
371 container_of((void *)bss, struct cfg80211_bss, priv);
372 struct ieee80211_channel *new_ch;
373 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
374 int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
375
376 ASSERT_MGD_MTX(ifmgd);
377
378 if (!ifmgd->associated)
379 return;
380
381 if (sdata->local->scanning)
382 return;
383
384 /* Disregard subsequent beacons if we are already running a timer
385 processing a CSA */
386
387 if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
388 return;
389
390 new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
391 if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
392 return;
393
394 sdata->local->csa_channel = new_ch;
395
396 if (sw_elem->count <= 1) {
397 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
398 } else {
399 ieee80211_stop_queues_by_reason(&sdata->local->hw,
400 IEEE80211_QUEUE_STOP_REASON_CSA);
401 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
402 mod_timer(&ifmgd->chswitch_timer,
403 jiffies +
404 msecs_to_jiffies(sw_elem->count *
405 cbss->beacon_interval));
406 }
407 }
408
409 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
410 u16 capab_info, u8 *pwr_constr_elem,
411 u8 pwr_constr_elem_len)
412 {
413 struct ieee80211_conf *conf = &sdata->local->hw.conf;
414
415 if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
416 return;
417
418 /* Power constraint IE length should be 1 octet */
419 if (pwr_constr_elem_len != 1)
420 return;
421
422 if ((*pwr_constr_elem <= conf->channel->max_power) &&
423 (*pwr_constr_elem != sdata->local->power_constr_level)) {
424 sdata->local->power_constr_level = *pwr_constr_elem;
425 ieee80211_hw_config(sdata->local, 0);
426 }
427 }
428
429 /* powersave */
430 static void ieee80211_enable_ps(struct ieee80211_local *local,
431 struct ieee80211_sub_if_data *sdata)
432 {
433 struct ieee80211_conf *conf = &local->hw.conf;
434
435 /*
436 * If we are scanning right now then the parameters will
437 * take effect when scan finishes.
438 */
439 if (local->scanning)
440 return;
441
442 if (conf->dynamic_ps_timeout > 0 &&
443 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
444 mod_timer(&local->dynamic_ps_timer, jiffies +
445 msecs_to_jiffies(conf->dynamic_ps_timeout));
446 } else {
447 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
448 ieee80211_send_nullfunc(local, sdata, 1);
449
450 if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
451 conf->flags |= IEEE80211_CONF_PS;
452 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
453 }
454 }
455 }
456
457 static void ieee80211_change_ps(struct ieee80211_local *local)
458 {
459 struct ieee80211_conf *conf = &local->hw.conf;
460
461 if (local->ps_sdata) {
462 ieee80211_enable_ps(local, local->ps_sdata);
463 } else if (conf->flags & IEEE80211_CONF_PS) {
464 conf->flags &= ~IEEE80211_CONF_PS;
465 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
466 del_timer_sync(&local->dynamic_ps_timer);
467 cancel_work_sync(&local->dynamic_ps_enable_work);
468 }
469 }
470
471 /* need to hold RTNL or interface lock */
472 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
473 {
474 struct ieee80211_sub_if_data *sdata, *found = NULL;
475 int count = 0;
476
477 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
478 local->ps_sdata = NULL;
479 return;
480 }
481
482 if (!list_empty(&local->work_list)) {
483 local->ps_sdata = NULL;
484 goto change;
485 }
486
487 list_for_each_entry(sdata, &local->interfaces, list) {
488 if (!ieee80211_sdata_running(sdata))
489 continue;
490 if (sdata->vif.type != NL80211_IFTYPE_STATION)
491 continue;
492 found = sdata;
493 count++;
494 }
495
496 if (count == 1 && found->u.mgd.powersave &&
497 found->u.mgd.associated &&
498 found->u.mgd.associated->beacon_ies &&
499 !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
500 IEEE80211_STA_CONNECTION_POLL))) {
501 s32 beaconint_us;
502
503 if (latency < 0)
504 latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
505
506 beaconint_us = ieee80211_tu_to_usec(
507 found->vif.bss_conf.beacon_int);
508
509 if (beaconint_us > latency) {
510 local->ps_sdata = NULL;
511 } else {
512 struct ieee80211_bss *bss;
513 int maxslp = 1;
514 u8 dtimper;
515
516 bss = (void *)found->u.mgd.associated->priv;
517 dtimper = bss->dtim_period;
518
519 /* If the TIM IE is invalid, pretend the value is 1 */
520 if (!dtimper)
521 dtimper = 1;
522 else if (dtimper > 1)
523 maxslp = min_t(int, dtimper,
524 latency / beaconint_us);
525
526 local->hw.conf.max_sleep_period = maxslp;
527 local->hw.conf.ps_dtim_period = dtimper;
528 local->ps_sdata = found;
529 }
530 } else {
531 local->ps_sdata = NULL;
532 }
533
534 change:
535 ieee80211_change_ps(local);
536 }
537
538 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
539 {
540 struct ieee80211_local *local =
541 container_of(work, struct ieee80211_local,
542 dynamic_ps_disable_work);
543
544 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
545 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
546 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
547 }
548
549 ieee80211_wake_queues_by_reason(&local->hw,
550 IEEE80211_QUEUE_STOP_REASON_PS);
551 }
552
553 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
554 {
555 struct ieee80211_local *local =
556 container_of(work, struct ieee80211_local,
557 dynamic_ps_enable_work);
558 struct ieee80211_sub_if_data *sdata = local->ps_sdata;
559 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
560
561 /* can only happen when PS was just disabled anyway */
562 if (!sdata)
563 return;
564
565 if (local->hw.conf.flags & IEEE80211_CONF_PS)
566 return;
567
568 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
569 (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
570 ieee80211_send_nullfunc(local, sdata, 1);
571
572 if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) ||
573 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
574 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
575 local->hw.conf.flags |= IEEE80211_CONF_PS;
576 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
577 }
578 }
579
580 void ieee80211_dynamic_ps_timer(unsigned long data)
581 {
582 struct ieee80211_local *local = (void *) data;
583
584 if (local->quiescing || local->suspended)
585 return;
586
587 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
588 }
589
590 /* MLME */
591 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
592 struct ieee80211_if_managed *ifmgd,
593 u8 *wmm_param, size_t wmm_param_len)
594 {
595 struct ieee80211_tx_queue_params params;
596 size_t left;
597 int count;
598 u8 *pos, uapsd_queues = 0;
599
600 if (!local->ops->conf_tx)
601 return;
602
603 if (local->hw.queues < 4)
604 return;
605
606 if (!wmm_param)
607 return;
608
609 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
610 return;
611
612 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
613 uapsd_queues = local->uapsd_queues;
614
615 count = wmm_param[6] & 0x0f;
616 if (count == ifmgd->wmm_last_param_set)
617 return;
618 ifmgd->wmm_last_param_set = count;
619
620 pos = wmm_param + 8;
621 left = wmm_param_len - 8;
622
623 memset(&params, 0, sizeof(params));
624
625 local->wmm_acm = 0;
626 for (; left >= 4; left -= 4, pos += 4) {
627 int aci = (pos[0] >> 5) & 0x03;
628 int acm = (pos[0] >> 4) & 0x01;
629 bool uapsd = false;
630 int queue;
631
632 switch (aci) {
633 case 1: /* AC_BK */
634 queue = 3;
635 if (acm)
636 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
637 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
638 uapsd = true;
639 break;
640 case 2: /* AC_VI */
641 queue = 1;
642 if (acm)
643 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
644 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
645 uapsd = true;
646 break;
647 case 3: /* AC_VO */
648 queue = 0;
649 if (acm)
650 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
651 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
652 uapsd = true;
653 break;
654 case 0: /* AC_BE */
655 default:
656 queue = 2;
657 if (acm)
658 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
659 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
660 uapsd = true;
661 break;
662 }
663
664 params.aifs = pos[0] & 0x0f;
665 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
666 params.cw_min = ecw2cw(pos[1] & 0x0f);
667 params.txop = get_unaligned_le16(pos + 2);
668 params.uapsd = uapsd;
669
670 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
671 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
672 "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
673 wiphy_name(local->hw.wiphy), queue, aci, acm,
674 params.aifs, params.cw_min, params.cw_max, params.txop,
675 params.uapsd);
676 #endif
677 if (drv_conf_tx(local, queue, &params))
678 printk(KERN_DEBUG "%s: failed to set TX queue "
679 "parameters for queue %d\n",
680 wiphy_name(local->hw.wiphy), queue);
681 }
682
683 /* enable WMM or activate new settings */
684 local->hw.conf.flags |= IEEE80211_CONF_QOS;
685 drv_config(local, IEEE80211_CONF_CHANGE_QOS);
686 }
687
688 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
689 u16 capab, bool erp_valid, u8 erp)
690 {
691 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
692 u32 changed = 0;
693 bool use_protection;
694 bool use_short_preamble;
695 bool use_short_slot;
696
697 if (erp_valid) {
698 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
699 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
700 } else {
701 use_protection = false;
702 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
703 }
704
705 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
706 if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
707 use_short_slot = true;
708
709 if (use_protection != bss_conf->use_cts_prot) {
710 bss_conf->use_cts_prot = use_protection;
711 changed |= BSS_CHANGED_ERP_CTS_PROT;
712 }
713
714 if (use_short_preamble != bss_conf->use_short_preamble) {
715 bss_conf->use_short_preamble = use_short_preamble;
716 changed |= BSS_CHANGED_ERP_PREAMBLE;
717 }
718
719 if (use_short_slot != bss_conf->use_short_slot) {
720 bss_conf->use_short_slot = use_short_slot;
721 changed |= BSS_CHANGED_ERP_SLOT;
722 }
723
724 return changed;
725 }
726
727 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
728 struct cfg80211_bss *cbss,
729 u32 bss_info_changed)
730 {
731 struct ieee80211_bss *bss = (void *)cbss->priv;
732 struct ieee80211_local *local = sdata->local;
733
734 bss_info_changed |= BSS_CHANGED_ASSOC;
735 /* set timing information */
736 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
737 sdata->vif.bss_conf.timestamp = cbss->tsf;
738
739 bss_info_changed |= BSS_CHANGED_BEACON_INT;
740 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
741 cbss->capability, bss->has_erp_value, bss->erp_value);
742
743 sdata->u.mgd.associated = cbss;
744 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
745
746 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
747
748 /* just to be sure */
749 sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
750 IEEE80211_STA_BEACON_POLL);
751
752 /*
753 * Always handle WMM once after association regardless
754 * of the first value the AP uses. Setting -1 here has
755 * that effect because the AP values is an unsigned
756 * 4-bit value.
757 */
758 sdata->u.mgd.wmm_last_param_set = -1;
759
760 ieee80211_led_assoc(local, 1);
761
762 sdata->vif.bss_conf.assoc = 1;
763 /*
764 * For now just always ask the driver to update the basic rateset
765 * when we have associated, we aren't checking whether it actually
766 * changed or not.
767 */
768 bss_info_changed |= BSS_CHANGED_BASIC_RATES;
769
770 /* And the BSSID changed - we're associated now */
771 bss_info_changed |= BSS_CHANGED_BSSID;
772
773 /* Tell the driver to monitor connection quality (if supported) */
774 if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
775 sdata->vif.bss_conf.cqm_rssi_thold)
776 bss_info_changed |= BSS_CHANGED_CQM;
777
778 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
779
780 mutex_lock(&local->iflist_mtx);
781 ieee80211_recalc_ps(local, -1);
782 ieee80211_recalc_smps(local, sdata);
783 mutex_unlock(&local->iflist_mtx);
784
785 netif_tx_start_all_queues(sdata->dev);
786 netif_carrier_on(sdata->dev);
787 }
788
789 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
790 bool remove_sta)
791 {
792 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
793 struct ieee80211_local *local = sdata->local;
794 struct sta_info *sta;
795 u32 changed = 0, config_changed = 0;
796 u8 bssid[ETH_ALEN];
797
798 ASSERT_MGD_MTX(ifmgd);
799
800 if (WARN_ON(!ifmgd->associated))
801 return;
802
803 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
804
805 ifmgd->associated = NULL;
806 memset(ifmgd->bssid, 0, ETH_ALEN);
807
808 /*
809 * we need to commit the associated = NULL change because the
810 * scan code uses that to determine whether this iface should
811 * go to/wake up from powersave or not -- and could otherwise
812 * wake the queues erroneously.
813 */
814 smp_mb();
815
816 /*
817 * Thus, we can only afterwards stop the queues -- to account
818 * for the case where another CPU is finishing a scan at this
819 * time -- we don't want the scan code to enable queues.
820 */
821
822 netif_tx_stop_all_queues(sdata->dev);
823 netif_carrier_off(sdata->dev);
824
825 rcu_read_lock();
826 sta = sta_info_get(sdata, bssid);
827 if (sta) {
828 set_sta_flags(sta, WLAN_STA_DISASSOC);
829 ieee80211_sta_tear_down_BA_sessions(sta);
830 }
831 rcu_read_unlock();
832
833 changed |= ieee80211_reset_erp_info(sdata);
834
835 ieee80211_led_assoc(local, 0);
836 changed |= BSS_CHANGED_ASSOC;
837 sdata->vif.bss_conf.assoc = false;
838
839 ieee80211_set_wmm_default(sdata);
840
841 /* channel(_type) changes are handled by ieee80211_hw_config */
842 local->oper_channel_type = NL80211_CHAN_NO_HT;
843
844 /* on the next assoc, re-program HT parameters */
845 sdata->ht_opmode_valid = false;
846
847 local->power_constr_level = 0;
848
849 del_timer_sync(&local->dynamic_ps_timer);
850 cancel_work_sync(&local->dynamic_ps_enable_work);
851
852 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
853 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
854 config_changed |= IEEE80211_CONF_CHANGE_PS;
855 }
856
857 ieee80211_hw_config(local, config_changed);
858
859 /* And the BSSID changed -- not very interesting here */
860 changed |= BSS_CHANGED_BSSID;
861 ieee80211_bss_info_change_notify(sdata, changed);
862
863 if (remove_sta)
864 sta_info_destroy_addr(sdata, bssid);
865 }
866
867 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
868 struct ieee80211_hdr *hdr)
869 {
870 /*
871 * We can postpone the mgd.timer whenever receiving unicast frames
872 * from AP because we know that the connection is working both ways
873 * at that time. But multicast frames (and hence also beacons) must
874 * be ignored here, because we need to trigger the timer during
875 * data idle periods for sending the periodic probe request to the
876 * AP we're connected to.
877 */
878 if (is_multicast_ether_addr(hdr->addr1))
879 return;
880
881 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
882 return;
883
884 mod_timer(&sdata->u.mgd.conn_mon_timer,
885 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
886 }
887
888 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
889 {
890 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
891 const u8 *ssid;
892
893 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
894 ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
895 ssid + 2, ssid[1], NULL, 0);
896
897 ifmgd->probe_send_count++;
898 ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
899 run_again(ifmgd, ifmgd->probe_timeout);
900 }
901
902 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
903 bool beacon)
904 {
905 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
906 bool already = false;
907
908 if (!ieee80211_sdata_running(sdata))
909 return;
910
911 if (sdata->local->scanning)
912 return;
913
914 if (sdata->local->tmp_channel)
915 return;
916
917 mutex_lock(&ifmgd->mtx);
918
919 if (!ifmgd->associated)
920 goto out;
921
922 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
923 if (beacon && net_ratelimit())
924 printk(KERN_DEBUG "%s: detected beacon loss from AP "
925 "- sending probe request\n", sdata->name);
926 #endif
927
928 /*
929 * The driver/our work has already reported this event or the
930 * connection monitoring has kicked in and we have already sent
931 * a probe request. Or maybe the AP died and the driver keeps
932 * reporting until we disassociate...
933 *
934 * In either case we have to ignore the current call to this
935 * function (except for setting the correct probe reason bit)
936 * because otherwise we would reset the timer every time and
937 * never check whether we received a probe response!
938 */
939 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
940 IEEE80211_STA_CONNECTION_POLL))
941 already = true;
942
943 if (beacon)
944 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
945 else
946 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
947
948 if (already)
949 goto out;
950
951 mutex_lock(&sdata->local->iflist_mtx);
952 ieee80211_recalc_ps(sdata->local, -1);
953 mutex_unlock(&sdata->local->iflist_mtx);
954
955 ifmgd->probe_send_count = 0;
956 ieee80211_mgd_probe_ap_send(sdata);
957 out:
958 mutex_unlock(&ifmgd->mtx);
959 }
960
961 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
962 {
963 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
964 struct ieee80211_local *local = sdata->local;
965 u8 bssid[ETH_ALEN];
966
967 mutex_lock(&ifmgd->mtx);
968 if (!ifmgd->associated) {
969 mutex_unlock(&ifmgd->mtx);
970 return;
971 }
972
973 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
974
975 printk(KERN_DEBUG "Connection to AP %pM lost.\n", bssid);
976
977 ieee80211_set_disassoc(sdata, true);
978 ieee80211_recalc_idle(local);
979 mutex_unlock(&ifmgd->mtx);
980 /*
981 * must be outside lock due to cfg80211,
982 * but that's not a problem.
983 */
984 ieee80211_send_deauth_disassoc(sdata, bssid,
985 IEEE80211_STYPE_DEAUTH,
986 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
987 NULL, true);
988 }
989
990 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
991 {
992 struct ieee80211_sub_if_data *sdata =
993 container_of(work, struct ieee80211_sub_if_data,
994 u.mgd.beacon_connection_loss_work);
995
996 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
997 __ieee80211_connection_loss(sdata);
998 else
999 ieee80211_mgd_probe_ap(sdata, true);
1000 }
1001
1002 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1003 {
1004 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1005 struct ieee80211_hw *hw = &sdata->local->hw;
1006
1007 WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1008 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1009 }
1010 EXPORT_SYMBOL(ieee80211_beacon_loss);
1011
1012 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1013 {
1014 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1015 struct ieee80211_hw *hw = &sdata->local->hw;
1016
1017 WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1018 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1019 }
1020 EXPORT_SYMBOL(ieee80211_connection_loss);
1021
1022
1023 static enum rx_mgmt_action __must_check
1024 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1025 struct ieee80211_mgmt *mgmt, size_t len)
1026 {
1027 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1028 const u8 *bssid = NULL;
1029 u16 reason_code;
1030
1031 if (len < 24 + 2)
1032 return RX_MGMT_NONE;
1033
1034 ASSERT_MGD_MTX(ifmgd);
1035
1036 bssid = ifmgd->associated->bssid;
1037
1038 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1039
1040 printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1041 sdata->name, bssid, reason_code);
1042
1043 ieee80211_set_disassoc(sdata, true);
1044 ieee80211_recalc_idle(sdata->local);
1045
1046 return RX_MGMT_CFG80211_DEAUTH;
1047 }
1048
1049
1050 static enum rx_mgmt_action __must_check
1051 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1052 struct ieee80211_mgmt *mgmt, size_t len)
1053 {
1054 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1055 u16 reason_code;
1056
1057 if (len < 24 + 2)
1058 return RX_MGMT_NONE;
1059
1060 ASSERT_MGD_MTX(ifmgd);
1061
1062 if (WARN_ON(!ifmgd->associated))
1063 return RX_MGMT_NONE;
1064
1065 if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1066 return RX_MGMT_NONE;
1067
1068 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1069
1070 printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1071 sdata->name, mgmt->sa, reason_code);
1072
1073 ieee80211_set_disassoc(sdata, true);
1074 ieee80211_recalc_idle(sdata->local);
1075 return RX_MGMT_CFG80211_DISASSOC;
1076 }
1077
1078
1079 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1080 struct ieee80211_mgmt *mgmt, size_t len)
1081 {
1082 struct ieee80211_sub_if_data *sdata = wk->sdata;
1083 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1084 struct ieee80211_local *local = sdata->local;
1085 struct ieee80211_supported_band *sband;
1086 struct sta_info *sta;
1087 struct cfg80211_bss *cbss = wk->assoc.bss;
1088 u8 *pos;
1089 u32 rates, basic_rates;
1090 u16 capab_info, aid;
1091 struct ieee802_11_elems elems;
1092 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1093 u32 changed = 0;
1094 int i, j, err;
1095 bool have_higher_than_11mbit = false;
1096 u16 ap_ht_cap_flags;
1097
1098 /* AssocResp and ReassocResp have identical structure */
1099
1100 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1101 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1102
1103 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1104 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1105 "set\n", sdata->name, aid);
1106 aid &= ~(BIT(15) | BIT(14));
1107
1108 pos = mgmt->u.assoc_resp.variable;
1109 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1110
1111 if (!elems.supp_rates) {
1112 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1113 sdata->name);
1114 return false;
1115 }
1116
1117 ifmgd->aid = aid;
1118
1119 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1120 if (!sta) {
1121 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1122 " the AP\n", sdata->name);
1123 return false;
1124 }
1125
1126 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1127 WLAN_STA_ASSOC_AP);
1128 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1129 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1130
1131 rates = 0;
1132 basic_rates = 0;
1133 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1134
1135 for (i = 0; i < elems.supp_rates_len; i++) {
1136 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1137 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1138
1139 if (rate > 110)
1140 have_higher_than_11mbit = true;
1141
1142 for (j = 0; j < sband->n_bitrates; j++) {
1143 if (sband->bitrates[j].bitrate == rate) {
1144 rates |= BIT(j);
1145 if (is_basic)
1146 basic_rates |= BIT(j);
1147 break;
1148 }
1149 }
1150 }
1151
1152 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1153 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1154 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1155
1156 if (rate > 110)
1157 have_higher_than_11mbit = true;
1158
1159 for (j = 0; j < sband->n_bitrates; j++) {
1160 if (sband->bitrates[j].bitrate == rate) {
1161 rates |= BIT(j);
1162 if (is_basic)
1163 basic_rates |= BIT(j);
1164 break;
1165 }
1166 }
1167 }
1168
1169 sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1170 sdata->vif.bss_conf.basic_rates = basic_rates;
1171
1172 /* cf. IEEE 802.11 9.2.12 */
1173 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1174 have_higher_than_11mbit)
1175 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1176 else
1177 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1178
1179 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1180 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1181 elems.ht_cap_elem, &sta->sta.ht_cap);
1182
1183 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1184
1185 rate_control_rate_init(sta);
1186
1187 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1188 set_sta_flags(sta, WLAN_STA_MFP);
1189
1190 if (elems.wmm_param)
1191 set_sta_flags(sta, WLAN_STA_WME);
1192
1193 err = sta_info_insert(sta);
1194 sta = NULL;
1195 if (err) {
1196 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1197 " the AP (error %d)\n", sdata->name, err);
1198 return false;
1199 }
1200
1201 if (elems.wmm_param)
1202 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1203 elems.wmm_param_len);
1204 else
1205 ieee80211_set_wmm_default(sdata);
1206
1207 local->oper_channel = wk->chan;
1208
1209 if (elems.ht_info_elem && elems.wmm_param &&
1210 (sdata->local->hw.queues >= 4) &&
1211 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1212 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1213 cbss->bssid, ap_ht_cap_flags);
1214
1215 /* set AID and assoc capability,
1216 * ieee80211_set_associated() will tell the driver */
1217 bss_conf->aid = aid;
1218 bss_conf->assoc_capability = capab_info;
1219 ieee80211_set_associated(sdata, cbss, changed);
1220
1221 /*
1222 * If we're using 4-addr mode, let the AP know that we're
1223 * doing so, so that it can create the STA VLAN on its side
1224 */
1225 if (ifmgd->use_4addr)
1226 ieee80211_send_4addr_nullfunc(local, sdata);
1227
1228 /*
1229 * Start timer to probe the connection to the AP now.
1230 * Also start the timer that will detect beacon loss.
1231 */
1232 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1233 mod_beacon_timer(sdata);
1234
1235 return true;
1236 }
1237
1238
1239 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1240 struct ieee80211_mgmt *mgmt,
1241 size_t len,
1242 struct ieee80211_rx_status *rx_status,
1243 struct ieee802_11_elems *elems,
1244 bool beacon)
1245 {
1246 struct ieee80211_local *local = sdata->local;
1247 int freq;
1248 struct ieee80211_bss *bss;
1249 struct ieee80211_channel *channel;
1250 bool need_ps = false;
1251
1252 if (sdata->u.mgd.associated) {
1253 bss = (void *)sdata->u.mgd.associated->priv;
1254 /* not previously set so we may need to recalc */
1255 need_ps = !bss->dtim_period;
1256 }
1257
1258 if (elems->ds_params && elems->ds_params_len == 1)
1259 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1260 else
1261 freq = rx_status->freq;
1262
1263 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1264
1265 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1266 return;
1267
1268 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1269 channel, beacon);
1270 if (bss)
1271 ieee80211_rx_bss_put(local, bss);
1272
1273 if (!sdata->u.mgd.associated)
1274 return;
1275
1276 if (need_ps) {
1277 mutex_lock(&local->iflist_mtx);
1278 ieee80211_recalc_ps(local, -1);
1279 mutex_unlock(&local->iflist_mtx);
1280 }
1281
1282 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1283 (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1284 ETH_ALEN) == 0)) {
1285 struct ieee80211_channel_sw_ie *sw_elem =
1286 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1287 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1288 }
1289 }
1290
1291
1292 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1293 struct sk_buff *skb)
1294 {
1295 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1296 struct ieee80211_if_managed *ifmgd;
1297 struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1298 size_t baselen, len = skb->len;
1299 struct ieee802_11_elems elems;
1300
1301 ifmgd = &sdata->u.mgd;
1302
1303 ASSERT_MGD_MTX(ifmgd);
1304
1305 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1306 return; /* ignore ProbeResp to foreign address */
1307
1308 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1309 if (baselen > len)
1310 return;
1311
1312 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1313 &elems);
1314
1315 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1316
1317 if (ifmgd->associated &&
1318 memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1319 ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1320 IEEE80211_STA_CONNECTION_POLL)) {
1321 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1322 IEEE80211_STA_BEACON_POLL);
1323 mutex_lock(&sdata->local->iflist_mtx);
1324 ieee80211_recalc_ps(sdata->local, -1);
1325 mutex_unlock(&sdata->local->iflist_mtx);
1326 /*
1327 * We've received a probe response, but are not sure whether
1328 * we have or will be receiving any beacons or data, so let's
1329 * schedule the timers again, just in case.
1330 */
1331 mod_beacon_timer(sdata);
1332 mod_timer(&ifmgd->conn_mon_timer,
1333 round_jiffies_up(jiffies +
1334 IEEE80211_CONNECTION_IDLE_TIME));
1335 }
1336 }
1337
1338 /*
1339 * This is the canonical list of information elements we care about,
1340 * the filter code also gives us all changes to the Microsoft OUI
1341 * (00:50:F2) vendor IE which is used for WMM which we need to track.
1342 *
1343 * We implement beacon filtering in software since that means we can
1344 * avoid processing the frame here and in cfg80211, and userspace
1345 * will not be able to tell whether the hardware supports it or not.
1346 *
1347 * XXX: This list needs to be dynamic -- userspace needs to be able to
1348 * add items it requires. It also needs to be able to tell us to
1349 * look out for other vendor IEs.
1350 */
1351 static const u64 care_about_ies =
1352 (1ULL << WLAN_EID_COUNTRY) |
1353 (1ULL << WLAN_EID_ERP_INFO) |
1354 (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1355 (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1356 (1ULL << WLAN_EID_HT_CAPABILITY) |
1357 (1ULL << WLAN_EID_HT_INFORMATION);
1358
1359 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1360 struct ieee80211_mgmt *mgmt,
1361 size_t len,
1362 struct ieee80211_rx_status *rx_status)
1363 {
1364 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1365 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1366 size_t baselen;
1367 struct ieee802_11_elems elems;
1368 struct ieee80211_local *local = sdata->local;
1369 u32 changed = 0;
1370 bool erp_valid, directed_tim = false;
1371 u8 erp_value = 0;
1372 u32 ncrc;
1373 u8 *bssid;
1374
1375 ASSERT_MGD_MTX(ifmgd);
1376
1377 /* Process beacon from the current BSS */
1378 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1379 if (baselen > len)
1380 return;
1381
1382 if (rx_status->freq != local->hw.conf.channel->center_freq)
1383 return;
1384
1385 /*
1386 * We might have received a number of frames, among them a
1387 * disassoc frame and a beacon...
1388 */
1389 if (!ifmgd->associated)
1390 return;
1391
1392 bssid = ifmgd->associated->bssid;
1393
1394 /*
1395 * And in theory even frames from a different AP we were just
1396 * associated to a split-second ago!
1397 */
1398 if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1399 return;
1400
1401 /* Track average RSSI from the Beacon frames of the current AP */
1402 ifmgd->last_beacon_signal = rx_status->signal;
1403 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1404 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1405 ifmgd->ave_beacon_signal = rx_status->signal;
1406 ifmgd->last_cqm_event_signal = 0;
1407 } else {
1408 ifmgd->ave_beacon_signal =
1409 (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1410 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1411 ifmgd->ave_beacon_signal) / 16;
1412 }
1413 if (bss_conf->cqm_rssi_thold &&
1414 !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1415 int sig = ifmgd->ave_beacon_signal / 16;
1416 int last_event = ifmgd->last_cqm_event_signal;
1417 int thold = bss_conf->cqm_rssi_thold;
1418 int hyst = bss_conf->cqm_rssi_hyst;
1419 if (sig < thold &&
1420 (last_event == 0 || sig < last_event - hyst)) {
1421 ifmgd->last_cqm_event_signal = sig;
1422 ieee80211_cqm_rssi_notify(
1423 &sdata->vif,
1424 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1425 GFP_KERNEL);
1426 } else if (sig > thold &&
1427 (last_event == 0 || sig > last_event + hyst)) {
1428 ifmgd->last_cqm_event_signal = sig;
1429 ieee80211_cqm_rssi_notify(
1430 &sdata->vif,
1431 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1432 GFP_KERNEL);
1433 }
1434 }
1435
1436 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1437 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1438 if (net_ratelimit()) {
1439 printk(KERN_DEBUG "%s: cancelling probereq poll due "
1440 "to a received beacon\n", sdata->name);
1441 }
1442 #endif
1443 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1444 mutex_lock(&local->iflist_mtx);
1445 ieee80211_recalc_ps(local, -1);
1446 mutex_unlock(&local->iflist_mtx);
1447 }
1448
1449 /*
1450 * Push the beacon loss detection into the future since
1451 * we are processing a beacon from the AP just now.
1452 */
1453 mod_beacon_timer(sdata);
1454
1455 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1456 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1457 len - baselen, &elems,
1458 care_about_ies, ncrc);
1459
1460 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1461 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1462 ifmgd->aid);
1463
1464 if (ncrc != ifmgd->beacon_crc) {
1465 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1466 true);
1467
1468 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1469 elems.wmm_param_len);
1470 }
1471
1472 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1473 if (directed_tim) {
1474 if (local->hw.conf.dynamic_ps_timeout > 0) {
1475 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1476 ieee80211_hw_config(local,
1477 IEEE80211_CONF_CHANGE_PS);
1478 ieee80211_send_nullfunc(local, sdata, 0);
1479 } else {
1480 local->pspolling = true;
1481
1482 /*
1483 * Here is assumed that the driver will be
1484 * able to send ps-poll frame and receive a
1485 * response even though power save mode is
1486 * enabled, but some drivers might require
1487 * to disable power save here. This needs
1488 * to be investigated.
1489 */
1490 ieee80211_send_pspoll(local, sdata);
1491 }
1492 }
1493 }
1494
1495 if (ncrc == ifmgd->beacon_crc)
1496 return;
1497 ifmgd->beacon_crc = ncrc;
1498
1499 if (elems.erp_info && elems.erp_info_len >= 1) {
1500 erp_valid = true;
1501 erp_value = elems.erp_info[0];
1502 } else {
1503 erp_valid = false;
1504 }
1505 changed |= ieee80211_handle_bss_capability(sdata,
1506 le16_to_cpu(mgmt->u.beacon.capab_info),
1507 erp_valid, erp_value);
1508
1509
1510 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1511 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1512 struct sta_info *sta;
1513 struct ieee80211_supported_band *sband;
1514 u16 ap_ht_cap_flags;
1515
1516 rcu_read_lock();
1517
1518 sta = sta_info_get(sdata, bssid);
1519 if (WARN_ON(!sta)) {
1520 rcu_read_unlock();
1521 return;
1522 }
1523
1524 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1525
1526 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1527 elems.ht_cap_elem, &sta->sta.ht_cap);
1528
1529 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1530
1531 rcu_read_unlock();
1532
1533 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1534 bssid, ap_ht_cap_flags);
1535 }
1536
1537 /* Note: country IE parsing is done for us by cfg80211 */
1538 if (elems.country_elem) {
1539 /* TODO: IBSS also needs this */
1540 if (elems.pwr_constr_elem)
1541 ieee80211_handle_pwr_constr(sdata,
1542 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1543 elems.pwr_constr_elem,
1544 elems.pwr_constr_elem_len);
1545 }
1546
1547 ieee80211_bss_info_change_notify(sdata, changed);
1548 }
1549
1550 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1551 struct sk_buff *skb)
1552 {
1553 struct ieee80211_local *local = sdata->local;
1554 struct ieee80211_mgmt *mgmt;
1555 u16 fc;
1556
1557 if (skb->len < 24)
1558 return RX_DROP_MONITOR;
1559
1560 mgmt = (struct ieee80211_mgmt *) skb->data;
1561 fc = le16_to_cpu(mgmt->frame_control);
1562
1563 switch (fc & IEEE80211_FCTL_STYPE) {
1564 case IEEE80211_STYPE_PROBE_RESP:
1565 case IEEE80211_STYPE_BEACON:
1566 case IEEE80211_STYPE_DEAUTH:
1567 case IEEE80211_STYPE_DISASSOC:
1568 case IEEE80211_STYPE_ACTION:
1569 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1570 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
1571 return RX_QUEUED;
1572 }
1573
1574 return RX_DROP_MONITOR;
1575 }
1576
1577 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1578 struct sk_buff *skb)
1579 {
1580 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1581 struct ieee80211_rx_status *rx_status;
1582 struct ieee80211_mgmt *mgmt;
1583 enum rx_mgmt_action rma = RX_MGMT_NONE;
1584 u16 fc;
1585
1586 rx_status = (struct ieee80211_rx_status *) skb->cb;
1587 mgmt = (struct ieee80211_mgmt *) skb->data;
1588 fc = le16_to_cpu(mgmt->frame_control);
1589
1590 mutex_lock(&ifmgd->mtx);
1591
1592 if (ifmgd->associated &&
1593 memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1594 switch (fc & IEEE80211_FCTL_STYPE) {
1595 case IEEE80211_STYPE_BEACON:
1596 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1597 rx_status);
1598 break;
1599 case IEEE80211_STYPE_PROBE_RESP:
1600 ieee80211_rx_mgmt_probe_resp(sdata, skb);
1601 break;
1602 case IEEE80211_STYPE_DEAUTH:
1603 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1604 break;
1605 case IEEE80211_STYPE_DISASSOC:
1606 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1607 break;
1608 case IEEE80211_STYPE_ACTION:
1609 if (mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
1610 break;
1611
1612 ieee80211_sta_process_chanswitch(sdata,
1613 &mgmt->u.action.u.chan_switch.sw_elem,
1614 (void *)ifmgd->associated->priv);
1615 break;
1616 }
1617 mutex_unlock(&ifmgd->mtx);
1618
1619 switch (rma) {
1620 case RX_MGMT_NONE:
1621 /* no action */
1622 break;
1623 case RX_MGMT_CFG80211_DEAUTH:
1624 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1625 break;
1626 case RX_MGMT_CFG80211_DISASSOC:
1627 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1628 break;
1629 default:
1630 WARN(1, "unexpected: %d", rma);
1631 }
1632 goto out;
1633 }
1634
1635 mutex_unlock(&ifmgd->mtx);
1636
1637 if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1638 (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH)
1639 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1640
1641 out:
1642 kfree_skb(skb);
1643 }
1644
1645 static void ieee80211_sta_timer(unsigned long data)
1646 {
1647 struct ieee80211_sub_if_data *sdata =
1648 (struct ieee80211_sub_if_data *) data;
1649 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1650 struct ieee80211_local *local = sdata->local;
1651
1652 if (local->quiescing) {
1653 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1654 return;
1655 }
1656
1657 ieee80211_queue_work(&local->hw, &ifmgd->work);
1658 }
1659
1660 static void ieee80211_sta_work(struct work_struct *work)
1661 {
1662 struct ieee80211_sub_if_data *sdata =
1663 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1664 struct ieee80211_local *local = sdata->local;
1665 struct ieee80211_if_managed *ifmgd;
1666 struct sk_buff *skb;
1667
1668 if (!ieee80211_sdata_running(sdata))
1669 return;
1670
1671 if (local->scanning)
1672 return;
1673
1674 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1675 return;
1676
1677 /*
1678 * ieee80211_queue_work() should have picked up most cases,
1679 * here we'll pick the the rest.
1680 */
1681 if (WARN(local->suspended, "STA MLME work scheduled while "
1682 "going to suspend\n"))
1683 return;
1684
1685 ifmgd = &sdata->u.mgd;
1686
1687 /* first process frames to avoid timing out while a frame is pending */
1688 while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1689 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1690
1691 /* then process the rest of the work */
1692 mutex_lock(&ifmgd->mtx);
1693
1694 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1695 IEEE80211_STA_CONNECTION_POLL) &&
1696 ifmgd->associated) {
1697 u8 bssid[ETH_ALEN];
1698
1699 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1700 if (time_is_after_jiffies(ifmgd->probe_timeout))
1701 run_again(ifmgd, ifmgd->probe_timeout);
1702
1703 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1704 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1705 printk(KERN_DEBUG "No probe response from AP %pM"
1706 " after %dms, try %d\n", bssid,
1707 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1708 ifmgd->probe_send_count);
1709 #endif
1710 ieee80211_mgd_probe_ap_send(sdata);
1711 } else {
1712 /*
1713 * We actually lost the connection ... or did we?
1714 * Let's make sure!
1715 */
1716 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1717 IEEE80211_STA_BEACON_POLL);
1718 printk(KERN_DEBUG "No probe response from AP %pM"
1719 " after %dms, disconnecting.\n",
1720 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1721 ieee80211_set_disassoc(sdata, true);
1722 ieee80211_recalc_idle(local);
1723 mutex_unlock(&ifmgd->mtx);
1724 /*
1725 * must be outside lock due to cfg80211,
1726 * but that's not a problem.
1727 */
1728 ieee80211_send_deauth_disassoc(sdata, bssid,
1729 IEEE80211_STYPE_DEAUTH,
1730 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1731 NULL, true);
1732 mutex_lock(&ifmgd->mtx);
1733 }
1734 }
1735
1736 mutex_unlock(&ifmgd->mtx);
1737 }
1738
1739 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1740 {
1741 struct ieee80211_sub_if_data *sdata =
1742 (struct ieee80211_sub_if_data *) data;
1743 struct ieee80211_local *local = sdata->local;
1744
1745 if (local->quiescing)
1746 return;
1747
1748 ieee80211_queue_work(&sdata->local->hw,
1749 &sdata->u.mgd.beacon_connection_loss_work);
1750 }
1751
1752 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1753 {
1754 struct ieee80211_sub_if_data *sdata =
1755 (struct ieee80211_sub_if_data *) data;
1756 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1757 struct ieee80211_local *local = sdata->local;
1758
1759 if (local->quiescing)
1760 return;
1761
1762 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1763 }
1764
1765 static void ieee80211_sta_monitor_work(struct work_struct *work)
1766 {
1767 struct ieee80211_sub_if_data *sdata =
1768 container_of(work, struct ieee80211_sub_if_data,
1769 u.mgd.monitor_work);
1770
1771 ieee80211_mgd_probe_ap(sdata, false);
1772 }
1773
1774 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1775 {
1776 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1777 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1778 IEEE80211_STA_CONNECTION_POLL);
1779
1780 /* let's probe the connection once */
1781 ieee80211_queue_work(&sdata->local->hw,
1782 &sdata->u.mgd.monitor_work);
1783 /* and do all the other regular work too */
1784 ieee80211_queue_work(&sdata->local->hw,
1785 &sdata->u.mgd.work);
1786 }
1787 }
1788
1789 #ifdef CONFIG_PM
1790 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1791 {
1792 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1793
1794 /*
1795 * we need to use atomic bitops for the running bits
1796 * only because both timers might fire at the same
1797 * time -- the code here is properly synchronised.
1798 */
1799
1800 cancel_work_sync(&ifmgd->work);
1801 cancel_work_sync(&ifmgd->beacon_connection_loss_work);
1802 if (del_timer_sync(&ifmgd->timer))
1803 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1804
1805 cancel_work_sync(&ifmgd->chswitch_work);
1806 if (del_timer_sync(&ifmgd->chswitch_timer))
1807 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1808
1809 cancel_work_sync(&ifmgd->monitor_work);
1810 /* these will just be re-established on connection */
1811 del_timer_sync(&ifmgd->conn_mon_timer);
1812 del_timer_sync(&ifmgd->bcn_mon_timer);
1813 }
1814
1815 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1816 {
1817 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1818
1819 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1820 add_timer(&ifmgd->timer);
1821 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1822 add_timer(&ifmgd->chswitch_timer);
1823 }
1824 #endif
1825
1826 /* interface setup */
1827 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1828 {
1829 struct ieee80211_if_managed *ifmgd;
1830
1831 ifmgd = &sdata->u.mgd;
1832 INIT_WORK(&ifmgd->work, ieee80211_sta_work);
1833 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1834 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1835 INIT_WORK(&ifmgd->beacon_connection_loss_work,
1836 ieee80211_beacon_connection_loss_work);
1837 setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1838 (unsigned long) sdata);
1839 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1840 (unsigned long) sdata);
1841 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1842 (unsigned long) sdata);
1843 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1844 (unsigned long) sdata);
1845 skb_queue_head_init(&ifmgd->skb_queue);
1846
1847 ifmgd->flags = 0;
1848
1849 mutex_init(&ifmgd->mtx);
1850
1851 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1852 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1853 else
1854 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1855 }
1856
1857 /* scan finished notification */
1858 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1859 {
1860 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1861
1862 /* Restart STA timers */
1863 rcu_read_lock();
1864 list_for_each_entry_rcu(sdata, &local->interfaces, list)
1865 ieee80211_restart_sta_timer(sdata);
1866 rcu_read_unlock();
1867 }
1868
1869 int ieee80211_max_network_latency(struct notifier_block *nb,
1870 unsigned long data, void *dummy)
1871 {
1872 s32 latency_usec = (s32) data;
1873 struct ieee80211_local *local =
1874 container_of(nb, struct ieee80211_local,
1875 network_latency_notifier);
1876
1877 mutex_lock(&local->iflist_mtx);
1878 ieee80211_recalc_ps(local, latency_usec);
1879 mutex_unlock(&local->iflist_mtx);
1880
1881 return 0;
1882 }
1883
1884 /* config hooks */
1885 static enum work_done_result
1886 ieee80211_probe_auth_done(struct ieee80211_work *wk,
1887 struct sk_buff *skb)
1888 {
1889 if (!skb) {
1890 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
1891 return WORK_DONE_DESTROY;
1892 }
1893
1894 if (wk->type == IEEE80211_WORK_AUTH) {
1895 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
1896 return WORK_DONE_DESTROY;
1897 }
1898
1899 mutex_lock(&wk->sdata->u.mgd.mtx);
1900 ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
1901 mutex_unlock(&wk->sdata->u.mgd.mtx);
1902
1903 wk->type = IEEE80211_WORK_AUTH;
1904 wk->probe_auth.tries = 0;
1905 return WORK_DONE_REQUEUE;
1906 }
1907
1908 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
1909 struct cfg80211_auth_request *req)
1910 {
1911 const u8 *ssid;
1912 struct ieee80211_work *wk;
1913 u16 auth_alg;
1914
1915 if (req->local_state_change)
1916 return 0; /* no need to update mac80211 state */
1917
1918 switch (req->auth_type) {
1919 case NL80211_AUTHTYPE_OPEN_SYSTEM:
1920 auth_alg = WLAN_AUTH_OPEN;
1921 break;
1922 case NL80211_AUTHTYPE_SHARED_KEY:
1923 auth_alg = WLAN_AUTH_SHARED_KEY;
1924 break;
1925 case NL80211_AUTHTYPE_FT:
1926 auth_alg = WLAN_AUTH_FT;
1927 break;
1928 case NL80211_AUTHTYPE_NETWORK_EAP:
1929 auth_alg = WLAN_AUTH_LEAP;
1930 break;
1931 default:
1932 return -EOPNOTSUPP;
1933 }
1934
1935 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1936 if (!wk)
1937 return -ENOMEM;
1938
1939 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1940
1941 if (req->ie && req->ie_len) {
1942 memcpy(wk->ie, req->ie, req->ie_len);
1943 wk->ie_len = req->ie_len;
1944 }
1945
1946 if (req->key && req->key_len) {
1947 wk->probe_auth.key_len = req->key_len;
1948 wk->probe_auth.key_idx = req->key_idx;
1949 memcpy(wk->probe_auth.key, req->key, req->key_len);
1950 }
1951
1952 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1953 memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
1954 wk->probe_auth.ssid_len = ssid[1];
1955
1956 wk->probe_auth.algorithm = auth_alg;
1957 wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
1958
1959 /* if we already have a probe, don't probe again */
1960 if (req->bss->proberesp_ies)
1961 wk->type = IEEE80211_WORK_AUTH;
1962 else
1963 wk->type = IEEE80211_WORK_DIRECT_PROBE;
1964 wk->chan = req->bss->channel;
1965 wk->sdata = sdata;
1966 wk->done = ieee80211_probe_auth_done;
1967
1968 ieee80211_add_work(wk);
1969 return 0;
1970 }
1971
1972 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
1973 struct sk_buff *skb)
1974 {
1975 struct ieee80211_mgmt *mgmt;
1976 u16 status;
1977
1978 if (!skb) {
1979 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
1980 return WORK_DONE_DESTROY;
1981 }
1982
1983 mgmt = (void *)skb->data;
1984 status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1985
1986 if (status == WLAN_STATUS_SUCCESS) {
1987 mutex_lock(&wk->sdata->u.mgd.mtx);
1988 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
1989 mutex_unlock(&wk->sdata->u.mgd.mtx);
1990 /* oops -- internal error -- send timeout for now */
1991 cfg80211_send_assoc_timeout(wk->sdata->dev,
1992 wk->filter_ta);
1993 return WORK_DONE_DESTROY;
1994 }
1995 mutex_unlock(&wk->sdata->u.mgd.mtx);
1996 }
1997
1998 cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
1999 return WORK_DONE_DESTROY;
2000 }
2001
2002 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2003 struct cfg80211_assoc_request *req)
2004 {
2005 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2006 struct ieee80211_bss *bss = (void *)req->bss->priv;
2007 struct ieee80211_work *wk;
2008 const u8 *ssid;
2009 int i;
2010
2011 mutex_lock(&ifmgd->mtx);
2012 if (ifmgd->associated) {
2013 if (!req->prev_bssid ||
2014 memcmp(req->prev_bssid, ifmgd->associated->bssid,
2015 ETH_ALEN)) {
2016 /*
2017 * We are already associated and the request was not a
2018 * reassociation request from the current BSS, so
2019 * reject it.
2020 */
2021 mutex_unlock(&ifmgd->mtx);
2022 return -EALREADY;
2023 }
2024
2025 /* Trying to reassociate - clear previous association state */
2026 ieee80211_set_disassoc(sdata, true);
2027 }
2028 mutex_unlock(&ifmgd->mtx);
2029
2030 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2031 if (!wk)
2032 return -ENOMEM;
2033
2034 ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2035 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2036
2037 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2038 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2039 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2040 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2041 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2042
2043
2044 if (req->ie && req->ie_len) {
2045 memcpy(wk->ie, req->ie, req->ie_len);
2046 wk->ie_len = req->ie_len;
2047 } else
2048 wk->ie_len = 0;
2049
2050 wk->assoc.bss = req->bss;
2051
2052 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2053
2054 /* new association always uses requested smps mode */
2055 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2056 if (ifmgd->powersave)
2057 ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2058 else
2059 ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2060 } else
2061 ifmgd->ap_smps = ifmgd->req_smps;
2062
2063 wk->assoc.smps = ifmgd->ap_smps;
2064 /*
2065 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2066 * We still associate in non-HT mode (11a/b/g) if any one of these
2067 * ciphers is configured as pairwise.
2068 * We can set this to true for non-11n hardware, that'll be checked
2069 * separately along with the peer capabilities.
2070 */
2071 wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2072 wk->assoc.capability = req->bss->capability;
2073 wk->assoc.wmm_used = bss->wmm_used;
2074 wk->assoc.supp_rates = bss->supp_rates;
2075 wk->assoc.supp_rates_len = bss->supp_rates_len;
2076 wk->assoc.ht_information_ie =
2077 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2078
2079 if (bss->wmm_used && bss->uapsd_supported &&
2080 (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2081 wk->assoc.uapsd_used = true;
2082 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2083 } else {
2084 wk->assoc.uapsd_used = false;
2085 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2086 }
2087
2088 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2089 memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2090 wk->assoc.ssid_len = ssid[1];
2091
2092 if (req->prev_bssid)
2093 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2094
2095 wk->type = IEEE80211_WORK_ASSOC;
2096 wk->chan = req->bss->channel;
2097 wk->sdata = sdata;
2098 wk->done = ieee80211_assoc_done;
2099
2100 if (req->use_mfp) {
2101 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2102 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2103 } else {
2104 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2105 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2106 }
2107
2108 if (req->crypto.control_port)
2109 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2110 else
2111 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2112
2113 ieee80211_add_work(wk);
2114 return 0;
2115 }
2116
2117 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2118 struct cfg80211_deauth_request *req,
2119 void *cookie)
2120 {
2121 struct ieee80211_local *local = sdata->local;
2122 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2123 struct ieee80211_work *wk;
2124 const u8 *bssid = req->bss->bssid;
2125
2126 mutex_lock(&ifmgd->mtx);
2127
2128 if (ifmgd->associated == req->bss) {
2129 bssid = req->bss->bssid;
2130 ieee80211_set_disassoc(sdata, true);
2131 mutex_unlock(&ifmgd->mtx);
2132 } else {
2133 bool not_auth_yet = false;
2134
2135 mutex_unlock(&ifmgd->mtx);
2136
2137 mutex_lock(&local->work_mtx);
2138 list_for_each_entry(wk, &local->work_list, list) {
2139 if (wk->sdata != sdata)
2140 continue;
2141
2142 if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2143 wk->type != IEEE80211_WORK_AUTH)
2144 continue;
2145
2146 if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2147 continue;
2148
2149 not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2150 list_del_rcu(&wk->list);
2151 free_work(wk);
2152 break;
2153 }
2154 mutex_unlock(&local->work_mtx);
2155
2156 /*
2157 * If somebody requests authentication and we haven't
2158 * sent out an auth frame yet there's no need to send
2159 * out a deauth frame either. If the state was PROBE,
2160 * then this is the case. If it's AUTH we have sent a
2161 * frame, and if it's IDLE we have completed the auth
2162 * process already.
2163 */
2164 if (not_auth_yet) {
2165 __cfg80211_auth_canceled(sdata->dev, bssid);
2166 return 0;
2167 }
2168 }
2169
2170 printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2171 sdata->name, bssid, req->reason_code);
2172
2173 ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2174 req->reason_code, cookie,
2175 !req->local_state_change);
2176
2177 ieee80211_recalc_idle(sdata->local);
2178
2179 return 0;
2180 }
2181
2182 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2183 struct cfg80211_disassoc_request *req,
2184 void *cookie)
2185 {
2186 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2187 u8 bssid[ETH_ALEN];
2188
2189 mutex_lock(&ifmgd->mtx);
2190
2191 /*
2192 * cfg80211 should catch this ... but it's racy since
2193 * we can receive a disassoc frame, process it, hand it
2194 * to cfg80211 while that's in a locked section already
2195 * trying to tell us that the user wants to disconnect.
2196 */
2197 if (ifmgd->associated != req->bss) {
2198 mutex_unlock(&ifmgd->mtx);
2199 return -ENOLINK;
2200 }
2201
2202 printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2203 sdata->name, req->bss->bssid, req->reason_code);
2204
2205 memcpy(bssid, req->bss->bssid, ETH_ALEN);
2206 ieee80211_set_disassoc(sdata, false);
2207
2208 mutex_unlock(&ifmgd->mtx);
2209
2210 ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2211 IEEE80211_STYPE_DISASSOC, req->reason_code,
2212 cookie, !req->local_state_change);
2213 sta_info_destroy_addr(sdata, bssid);
2214
2215 ieee80211_recalc_idle(sdata->local);
2216
2217 return 0;
2218 }
2219
2220 int ieee80211_mgd_action(struct ieee80211_sub_if_data *sdata,
2221 struct ieee80211_channel *chan,
2222 enum nl80211_channel_type channel_type,
2223 const u8 *buf, size_t len, u64 *cookie)
2224 {
2225 struct ieee80211_local *local = sdata->local;
2226 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2227 struct sk_buff *skb;
2228
2229 /* Check that we are on the requested channel for transmission */
2230 if ((chan != local->tmp_channel ||
2231 channel_type != local->tmp_channel_type) &&
2232 (chan != local->oper_channel ||
2233 channel_type != local->oper_channel_type))
2234 return -EBUSY;
2235
2236 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len);
2237 if (!skb)
2238 return -ENOMEM;
2239 skb_reserve(skb, local->hw.extra_tx_headroom);
2240
2241 memcpy(skb_put(skb, len), buf, len);
2242
2243 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
2244 IEEE80211_SKB_CB(skb)->flags |=
2245 IEEE80211_TX_INTFL_DONT_ENCRYPT;
2246 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX |
2247 IEEE80211_TX_CTL_REQ_TX_STATUS;
2248 skb->dev = sdata->dev;
2249 ieee80211_tx_skb(sdata, skb);
2250
2251 *cookie = (unsigned long) skb;
2252 return 0;
2253 }
2254
2255 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2256 enum nl80211_cqm_rssi_threshold_event rssi_event,
2257 gfp_t gfp)
2258 {
2259 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2260
2261 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2262 }
2263 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
Linux kernel - Deliverables
This page took 0.108146 seconds and 5 git commands to generate.