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include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit...
[mirror_ubuntu-artful-kernel.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 #define TMR_RUNNING_TIMER 0
51 #define TMR_RUNNING_CHANSW 1
52
53 /*
54 * All cfg80211 functions have to be called outside a locked
55 * section so that they can acquire a lock themselves... This
56 * is much simpler than queuing up things in cfg80211, but we
57 * do need some indirection for that here.
58 */
59 enum rx_mgmt_action {
60 /* no action required */
61 RX_MGMT_NONE,
62
63 /* caller must call cfg80211_send_rx_auth() */
64 RX_MGMT_CFG80211_AUTH,
65
66 /* caller must call cfg80211_send_rx_assoc() */
67 RX_MGMT_CFG80211_ASSOC,
68
69 /* caller must call cfg80211_send_deauth() */
70 RX_MGMT_CFG80211_DEAUTH,
71
72 /* caller must call cfg80211_send_disassoc() */
73 RX_MGMT_CFG80211_DISASSOC,
74
75 /* caller must tell cfg80211 about internal error */
76 RX_MGMT_CFG80211_ASSOC_ERROR,
77 };
78
79 /* utils */
80 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
81 {
82 WARN_ON(!mutex_is_locked(&ifmgd->mtx));
83 }
84
85 /*
86 * We can have multiple work items (and connection probing)
87 * scheduling this timer, but we need to take care to only
88 * reschedule it when it should fire _earlier_ than it was
89 * asked for before, or if it's not pending right now. This
90 * function ensures that. Note that it then is required to
91 * run this function for all timeouts after the first one
92 * has happened -- the work that runs from this timer will
93 * do that.
94 */
95 static void run_again(struct ieee80211_if_managed *ifmgd,
96 unsigned long timeout)
97 {
98 ASSERT_MGD_MTX(ifmgd);
99
100 if (!timer_pending(&ifmgd->timer) ||
101 time_before(timeout, ifmgd->timer.expires))
102 mod_timer(&ifmgd->timer, timeout);
103 }
104
105 static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata)
106 {
107 if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
108 return;
109
110 mod_timer(&sdata->u.mgd.bcn_mon_timer,
111 round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME));
112 }
113
114 static int ecw2cw(int ecw)
115 {
116 return (1 << ecw) - 1;
117 }
118
119 /*
120 * ieee80211_enable_ht should be called only after the operating band
121 * has been determined as ht configuration depends on the hw's
122 * HT abilities for a specific band.
123 */
124 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
125 struct ieee80211_ht_info *hti,
126 const u8 *bssid, u16 ap_ht_cap_flags)
127 {
128 struct ieee80211_local *local = sdata->local;
129 struct ieee80211_supported_band *sband;
130 struct sta_info *sta;
131 u32 changed = 0;
132 u16 ht_opmode;
133 bool enable_ht = true, ht_changed;
134 enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
135
136 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
137
138 /* HT is not supported */
139 if (!sband->ht_cap.ht_supported)
140 enable_ht = false;
141
142 /* check that channel matches the right operating channel */
143 if (local->hw.conf.channel->center_freq !=
144 ieee80211_channel_to_frequency(hti->control_chan))
145 enable_ht = false;
146
147 if (enable_ht) {
148 channel_type = NL80211_CHAN_HT20;
149
150 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
151 (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
152 (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
153 switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
154 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
155 if (!(local->hw.conf.channel->flags &
156 IEEE80211_CHAN_NO_HT40PLUS))
157 channel_type = NL80211_CHAN_HT40PLUS;
158 break;
159 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
160 if (!(local->hw.conf.channel->flags &
161 IEEE80211_CHAN_NO_HT40MINUS))
162 channel_type = NL80211_CHAN_HT40MINUS;
163 break;
164 }
165 }
166 }
167
168 ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
169 channel_type != local->hw.conf.channel_type;
170
171 local->oper_channel_type = channel_type;
172
173 if (ht_changed) {
174 /* channel_type change automatically detected */
175 ieee80211_hw_config(local, 0);
176
177 rcu_read_lock();
178 sta = sta_info_get(sdata, bssid);
179 if (sta)
180 rate_control_rate_update(local, sband, sta,
181 IEEE80211_RC_HT_CHANGED,
182 local->oper_channel_type);
183 rcu_read_unlock();
184 }
185
186 /* disable HT */
187 if (!enable_ht)
188 return 0;
189
190 ht_opmode = le16_to_cpu(hti->operation_mode);
191
192 /* if bss configuration changed store the new one */
193 if (!sdata->ht_opmode_valid ||
194 sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
195 changed |= BSS_CHANGED_HT;
196 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
197 sdata->ht_opmode_valid = true;
198 }
199
200 return changed;
201 }
202
203 /* frame sending functions */
204
205 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
206 const u8 *bssid, u16 stype, u16 reason,
207 void *cookie)
208 {
209 struct ieee80211_local *local = sdata->local;
210 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
211 struct sk_buff *skb;
212 struct ieee80211_mgmt *mgmt;
213
214 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
215 if (!skb) {
216 printk(KERN_DEBUG "%s: failed to allocate buffer for "
217 "deauth/disassoc frame\n", sdata->name);
218 return;
219 }
220 skb_reserve(skb, local->hw.extra_tx_headroom);
221
222 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
223 memset(mgmt, 0, 24);
224 memcpy(mgmt->da, bssid, ETH_ALEN);
225 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
226 memcpy(mgmt->bssid, bssid, ETH_ALEN);
227 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
228 skb_put(skb, 2);
229 /* u.deauth.reason_code == u.disassoc.reason_code */
230 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
231
232 if (stype == IEEE80211_STYPE_DEAUTH)
233 if (cookie)
234 __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
235 else
236 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
237 else
238 if (cookie)
239 __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
240 else
241 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
242 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
243 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
244 ieee80211_tx_skb(sdata, skb);
245 }
246
247 void ieee80211_send_pspoll(struct ieee80211_local *local,
248 struct ieee80211_sub_if_data *sdata)
249 {
250 struct ieee80211_pspoll *pspoll;
251 struct sk_buff *skb;
252
253 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
254 if (!skb)
255 return;
256
257 pspoll = (struct ieee80211_pspoll *) skb->data;
258 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
259
260 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
261 ieee80211_tx_skb(sdata, skb);
262 }
263
264 void ieee80211_send_nullfunc(struct ieee80211_local *local,
265 struct ieee80211_sub_if_data *sdata,
266 int powersave)
267 {
268 struct sk_buff *skb;
269 struct ieee80211_hdr_3addr *nullfunc;
270
271 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
272 if (!skb)
273 return;
274
275 nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
276 if (powersave)
277 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
278
279 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
280 ieee80211_tx_skb(sdata, skb);
281 }
282
283 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
284 struct ieee80211_sub_if_data *sdata)
285 {
286 struct sk_buff *skb;
287 struct ieee80211_hdr *nullfunc;
288 __le16 fc;
289
290 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
291 return;
292
293 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
294 if (!skb) {
295 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
296 "nullfunc frame\n", sdata->name);
297 return;
298 }
299 skb_reserve(skb, local->hw.extra_tx_headroom);
300
301 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
302 memset(nullfunc, 0, 30);
303 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
304 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
305 nullfunc->frame_control = fc;
306 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
307 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
308 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
309 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
310
311 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
312 ieee80211_tx_skb(sdata, skb);
313 }
314
315 /* spectrum management related things */
316 static void ieee80211_chswitch_work(struct work_struct *work)
317 {
318 struct ieee80211_sub_if_data *sdata =
319 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
320 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
321
322 if (!ieee80211_sdata_running(sdata))
323 return;
324
325 mutex_lock(&ifmgd->mtx);
326 if (!ifmgd->associated)
327 goto out;
328
329 sdata->local->oper_channel = sdata->local->csa_channel;
330 ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL);
331
332 /* XXX: shouldn't really modify cfg80211-owned data! */
333 ifmgd->associated->channel = sdata->local->oper_channel;
334
335 ieee80211_wake_queues_by_reason(&sdata->local->hw,
336 IEEE80211_QUEUE_STOP_REASON_CSA);
337 out:
338 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
339 mutex_unlock(&ifmgd->mtx);
340 }
341
342 static void ieee80211_chswitch_timer(unsigned long data)
343 {
344 struct ieee80211_sub_if_data *sdata =
345 (struct ieee80211_sub_if_data *) data;
346 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
347
348 if (sdata->local->quiescing) {
349 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
350 return;
351 }
352
353 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
354 }
355
356 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
357 struct ieee80211_channel_sw_ie *sw_elem,
358 struct ieee80211_bss *bss)
359 {
360 struct cfg80211_bss *cbss =
361 container_of((void *)bss, struct cfg80211_bss, priv);
362 struct ieee80211_channel *new_ch;
363 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
364 int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
365
366 ASSERT_MGD_MTX(ifmgd);
367
368 if (!ifmgd->associated)
369 return;
370
371 if (sdata->local->scanning)
372 return;
373
374 /* Disregard subsequent beacons if we are already running a timer
375 processing a CSA */
376
377 if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
378 return;
379
380 new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
381 if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
382 return;
383
384 sdata->local->csa_channel = new_ch;
385
386 if (sw_elem->count <= 1) {
387 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
388 } else {
389 ieee80211_stop_queues_by_reason(&sdata->local->hw,
390 IEEE80211_QUEUE_STOP_REASON_CSA);
391 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
392 mod_timer(&ifmgd->chswitch_timer,
393 jiffies +
394 msecs_to_jiffies(sw_elem->count *
395 cbss->beacon_interval));
396 }
397 }
398
399 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
400 u16 capab_info, u8 *pwr_constr_elem,
401 u8 pwr_constr_elem_len)
402 {
403 struct ieee80211_conf *conf = &sdata->local->hw.conf;
404
405 if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
406 return;
407
408 /* Power constraint IE length should be 1 octet */
409 if (pwr_constr_elem_len != 1)
410 return;
411
412 if ((*pwr_constr_elem <= conf->channel->max_power) &&
413 (*pwr_constr_elem != sdata->local->power_constr_level)) {
414 sdata->local->power_constr_level = *pwr_constr_elem;
415 ieee80211_hw_config(sdata->local, 0);
416 }
417 }
418
419 /* powersave */
420 static void ieee80211_enable_ps(struct ieee80211_local *local,
421 struct ieee80211_sub_if_data *sdata)
422 {
423 struct ieee80211_conf *conf = &local->hw.conf;
424
425 /*
426 * If we are scanning right now then the parameters will
427 * take effect when scan finishes.
428 */
429 if (local->scanning)
430 return;
431
432 if (conf->dynamic_ps_timeout > 0 &&
433 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
434 mod_timer(&local->dynamic_ps_timer, jiffies +
435 msecs_to_jiffies(conf->dynamic_ps_timeout));
436 } else {
437 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
438 ieee80211_send_nullfunc(local, sdata, 1);
439
440 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
441 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
442 return;
443
444 conf->flags |= IEEE80211_CONF_PS;
445 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
446 }
447 }
448
449 static void ieee80211_change_ps(struct ieee80211_local *local)
450 {
451 struct ieee80211_conf *conf = &local->hw.conf;
452
453 if (local->ps_sdata) {
454 ieee80211_enable_ps(local, local->ps_sdata);
455 } else if (conf->flags & IEEE80211_CONF_PS) {
456 conf->flags &= ~IEEE80211_CONF_PS;
457 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
458 del_timer_sync(&local->dynamic_ps_timer);
459 cancel_work_sync(&local->dynamic_ps_enable_work);
460 }
461 }
462
463 /* need to hold RTNL or interface lock */
464 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
465 {
466 struct ieee80211_sub_if_data *sdata, *found = NULL;
467 int count = 0;
468
469 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
470 local->ps_sdata = NULL;
471 return;
472 }
473
474 if (!list_empty(&local->work_list)) {
475 local->ps_sdata = NULL;
476 goto change;
477 }
478
479 list_for_each_entry(sdata, &local->interfaces, list) {
480 if (!ieee80211_sdata_running(sdata))
481 continue;
482 if (sdata->vif.type != NL80211_IFTYPE_STATION)
483 continue;
484 found = sdata;
485 count++;
486 }
487
488 if (count == 1 && found->u.mgd.powersave &&
489 found->u.mgd.associated &&
490 found->u.mgd.associated->beacon_ies &&
491 !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
492 IEEE80211_STA_CONNECTION_POLL))) {
493 s32 beaconint_us;
494
495 if (latency < 0)
496 latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
497
498 beaconint_us = ieee80211_tu_to_usec(
499 found->vif.bss_conf.beacon_int);
500
501 if (beaconint_us > latency) {
502 local->ps_sdata = NULL;
503 } else {
504 struct ieee80211_bss *bss;
505 int maxslp = 1;
506 u8 dtimper;
507
508 bss = (void *)found->u.mgd.associated->priv;
509 dtimper = bss->dtim_period;
510
511 /* If the TIM IE is invalid, pretend the value is 1 */
512 if (!dtimper)
513 dtimper = 1;
514 else if (dtimper > 1)
515 maxslp = min_t(int, dtimper,
516 latency / beaconint_us);
517
518 local->hw.conf.max_sleep_period = maxslp;
519 local->hw.conf.ps_dtim_period = dtimper;
520 local->ps_sdata = found;
521 }
522 } else {
523 local->ps_sdata = NULL;
524 }
525
526 change:
527 ieee80211_change_ps(local);
528 }
529
530 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
531 {
532 struct ieee80211_local *local =
533 container_of(work, struct ieee80211_local,
534 dynamic_ps_disable_work);
535
536 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
537 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
538 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
539 }
540
541 ieee80211_wake_queues_by_reason(&local->hw,
542 IEEE80211_QUEUE_STOP_REASON_PS);
543 }
544
545 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
546 {
547 struct ieee80211_local *local =
548 container_of(work, struct ieee80211_local,
549 dynamic_ps_enable_work);
550 struct ieee80211_sub_if_data *sdata = local->ps_sdata;
551 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
552
553 /* can only happen when PS was just disabled anyway */
554 if (!sdata)
555 return;
556
557 if (local->hw.conf.flags & IEEE80211_CONF_PS)
558 return;
559
560 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
561 (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
562 ieee80211_send_nullfunc(local, sdata, 1);
563
564 if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
565 (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
566 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
567 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
568 local->hw.conf.flags |= IEEE80211_CONF_PS;
569 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
570 }
571 }
572
573 void ieee80211_dynamic_ps_timer(unsigned long data)
574 {
575 struct ieee80211_local *local = (void *) data;
576
577 if (local->quiescing || local->suspended)
578 return;
579
580 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
581 }
582
583 /* MLME */
584 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
585 struct ieee80211_if_managed *ifmgd,
586 u8 *wmm_param, size_t wmm_param_len)
587 {
588 struct ieee80211_tx_queue_params params;
589 size_t left;
590 int count;
591 u8 *pos, uapsd_queues = 0;
592
593 if (local->hw.queues < 4)
594 return;
595
596 if (!wmm_param)
597 return;
598
599 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
600 return;
601
602 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
603 uapsd_queues = local->uapsd_queues;
604
605 count = wmm_param[6] & 0x0f;
606 if (count == ifmgd->wmm_last_param_set)
607 return;
608 ifmgd->wmm_last_param_set = count;
609
610 pos = wmm_param + 8;
611 left = wmm_param_len - 8;
612
613 memset(&params, 0, sizeof(params));
614
615 local->wmm_acm = 0;
616 for (; left >= 4; left -= 4, pos += 4) {
617 int aci = (pos[0] >> 5) & 0x03;
618 int acm = (pos[0] >> 4) & 0x01;
619 bool uapsd = false;
620 int queue;
621
622 switch (aci) {
623 case 1: /* AC_BK */
624 queue = 3;
625 if (acm)
626 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
627 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
628 uapsd = true;
629 break;
630 case 2: /* AC_VI */
631 queue = 1;
632 if (acm)
633 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
634 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
635 uapsd = true;
636 break;
637 case 3: /* AC_VO */
638 queue = 0;
639 if (acm)
640 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
641 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
642 uapsd = true;
643 break;
644 case 0: /* AC_BE */
645 default:
646 queue = 2;
647 if (acm)
648 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
649 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
650 uapsd = true;
651 break;
652 }
653
654 params.aifs = pos[0] & 0x0f;
655 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
656 params.cw_min = ecw2cw(pos[1] & 0x0f);
657 params.txop = get_unaligned_le16(pos + 2);
658 params.uapsd = uapsd;
659
660 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
661 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
662 "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
663 wiphy_name(local->hw.wiphy), queue, aci, acm,
664 params.aifs, params.cw_min, params.cw_max, params.txop,
665 params.uapsd);
666 #endif
667 if (drv_conf_tx(local, queue, &params) && local->ops->conf_tx)
668 printk(KERN_DEBUG "%s: failed to set TX queue "
669 "parameters for queue %d\n",
670 wiphy_name(local->hw.wiphy), queue);
671 }
672 }
673
674 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
675 u16 capab, bool erp_valid, u8 erp)
676 {
677 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
678 u32 changed = 0;
679 bool use_protection;
680 bool use_short_preamble;
681 bool use_short_slot;
682
683 if (erp_valid) {
684 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
685 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
686 } else {
687 use_protection = false;
688 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
689 }
690
691 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
692 if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
693 use_short_slot = true;
694
695 if (use_protection != bss_conf->use_cts_prot) {
696 bss_conf->use_cts_prot = use_protection;
697 changed |= BSS_CHANGED_ERP_CTS_PROT;
698 }
699
700 if (use_short_preamble != bss_conf->use_short_preamble) {
701 bss_conf->use_short_preamble = use_short_preamble;
702 changed |= BSS_CHANGED_ERP_PREAMBLE;
703 }
704
705 if (use_short_slot != bss_conf->use_short_slot) {
706 bss_conf->use_short_slot = use_short_slot;
707 changed |= BSS_CHANGED_ERP_SLOT;
708 }
709
710 return changed;
711 }
712
713 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
714 struct cfg80211_bss *cbss,
715 u32 bss_info_changed)
716 {
717 struct ieee80211_bss *bss = (void *)cbss->priv;
718 struct ieee80211_local *local = sdata->local;
719
720 bss_info_changed |= BSS_CHANGED_ASSOC;
721 /* set timing information */
722 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
723 sdata->vif.bss_conf.timestamp = cbss->tsf;
724
725 bss_info_changed |= BSS_CHANGED_BEACON_INT;
726 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
727 cbss->capability, bss->has_erp_value, bss->erp_value);
728
729 sdata->u.mgd.associated = cbss;
730 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
731
732 /* just to be sure */
733 sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
734 IEEE80211_STA_BEACON_POLL);
735
736 /*
737 * Always handle WMM once after association regardless
738 * of the first value the AP uses. Setting -1 here has
739 * that effect because the AP values is an unsigned
740 * 4-bit value.
741 */
742 sdata->u.mgd.wmm_last_param_set = -1;
743
744 ieee80211_led_assoc(local, 1);
745
746 sdata->vif.bss_conf.assoc = 1;
747 /*
748 * For now just always ask the driver to update the basic rateset
749 * when we have associated, we aren't checking whether it actually
750 * changed or not.
751 */
752 bss_info_changed |= BSS_CHANGED_BASIC_RATES;
753
754 /* And the BSSID changed - we're associated now */
755 bss_info_changed |= BSS_CHANGED_BSSID;
756
757 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
758
759 mutex_lock(&local->iflist_mtx);
760 ieee80211_recalc_ps(local, -1);
761 ieee80211_recalc_smps(local, sdata);
762 mutex_unlock(&local->iflist_mtx);
763
764 netif_tx_start_all_queues(sdata->dev);
765 netif_carrier_on(sdata->dev);
766 }
767
768 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata)
769 {
770 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
771 struct ieee80211_local *local = sdata->local;
772 struct sta_info *sta;
773 u32 changed = 0, config_changed = 0;
774 u8 bssid[ETH_ALEN];
775
776 ASSERT_MGD_MTX(ifmgd);
777
778 if (WARN_ON(!ifmgd->associated))
779 return;
780
781 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
782
783 ifmgd->associated = NULL;
784 memset(ifmgd->bssid, 0, ETH_ALEN);
785
786 /*
787 * we need to commit the associated = NULL change because the
788 * scan code uses that to determine whether this iface should
789 * go to/wake up from powersave or not -- and could otherwise
790 * wake the queues erroneously.
791 */
792 smp_mb();
793
794 /*
795 * Thus, we can only afterwards stop the queues -- to account
796 * for the case where another CPU is finishing a scan at this
797 * time -- we don't want the scan code to enable queues.
798 */
799
800 netif_tx_stop_all_queues(sdata->dev);
801 netif_carrier_off(sdata->dev);
802
803 rcu_read_lock();
804 sta = sta_info_get(sdata, bssid);
805 if (sta) {
806 set_sta_flags(sta, WLAN_STA_DISASSOC);
807 ieee80211_sta_tear_down_BA_sessions(sta);
808 }
809 rcu_read_unlock();
810
811 changed |= ieee80211_reset_erp_info(sdata);
812
813 ieee80211_led_assoc(local, 0);
814 changed |= BSS_CHANGED_ASSOC;
815 sdata->vif.bss_conf.assoc = false;
816
817 ieee80211_set_wmm_default(sdata);
818
819 /* channel(_type) changes are handled by ieee80211_hw_config */
820 local->oper_channel_type = NL80211_CHAN_NO_HT;
821
822 /* on the next assoc, re-program HT parameters */
823 sdata->ht_opmode_valid = false;
824
825 local->power_constr_level = 0;
826
827 del_timer_sync(&local->dynamic_ps_timer);
828 cancel_work_sync(&local->dynamic_ps_enable_work);
829
830 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
831 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
832 config_changed |= IEEE80211_CONF_CHANGE_PS;
833 }
834
835 ieee80211_hw_config(local, config_changed);
836
837 /* And the BSSID changed -- not very interesting here */
838 changed |= BSS_CHANGED_BSSID;
839 ieee80211_bss_info_change_notify(sdata, changed);
840
841 sta_info_destroy_addr(sdata, bssid);
842 }
843
844 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
845 struct ieee80211_hdr *hdr)
846 {
847 /*
848 * We can postpone the mgd.timer whenever receiving unicast frames
849 * from AP because we know that the connection is working both ways
850 * at that time. But multicast frames (and hence also beacons) must
851 * be ignored here, because we need to trigger the timer during
852 * data idle periods for sending the periodic probe request to the
853 * AP we're connected to.
854 */
855 if (is_multicast_ether_addr(hdr->addr1))
856 return;
857
858 mod_timer(&sdata->u.mgd.conn_mon_timer,
859 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
860 }
861
862 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
863 {
864 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
865 const u8 *ssid;
866
867 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
868 ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
869 ssid + 2, ssid[1], NULL, 0);
870
871 ifmgd->probe_send_count++;
872 ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
873 run_again(ifmgd, ifmgd->probe_timeout);
874 }
875
876 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
877 bool beacon)
878 {
879 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
880 bool already = false;
881
882 if (!ieee80211_sdata_running(sdata))
883 return;
884
885 if (sdata->local->scanning)
886 return;
887
888 if (sdata->local->tmp_channel)
889 return;
890
891 mutex_lock(&ifmgd->mtx);
892
893 if (!ifmgd->associated)
894 goto out;
895
896 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
897 if (beacon && net_ratelimit())
898 printk(KERN_DEBUG "%s: detected beacon loss from AP "
899 "- sending probe request\n", sdata->name);
900 #endif
901
902 /*
903 * The driver/our work has already reported this event or the
904 * connection monitoring has kicked in and we have already sent
905 * a probe request. Or maybe the AP died and the driver keeps
906 * reporting until we disassociate...
907 *
908 * In either case we have to ignore the current call to this
909 * function (except for setting the correct probe reason bit)
910 * because otherwise we would reset the timer every time and
911 * never check whether we received a probe response!
912 */
913 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
914 IEEE80211_STA_CONNECTION_POLL))
915 already = true;
916
917 if (beacon)
918 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
919 else
920 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
921
922 if (already)
923 goto out;
924
925 mutex_lock(&sdata->local->iflist_mtx);
926 ieee80211_recalc_ps(sdata->local, -1);
927 mutex_unlock(&sdata->local->iflist_mtx);
928
929 ifmgd->probe_send_count = 0;
930 ieee80211_mgd_probe_ap_send(sdata);
931 out:
932 mutex_unlock(&ifmgd->mtx);
933 }
934
935 void ieee80211_beacon_loss_work(struct work_struct *work)
936 {
937 struct ieee80211_sub_if_data *sdata =
938 container_of(work, struct ieee80211_sub_if_data,
939 u.mgd.beacon_loss_work);
940
941 ieee80211_mgd_probe_ap(sdata, true);
942 }
943
944 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
945 {
946 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
947
948 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
949 }
950 EXPORT_SYMBOL(ieee80211_beacon_loss);
951
952 static enum rx_mgmt_action __must_check
953 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
954 struct ieee80211_mgmt *mgmt, size_t len)
955 {
956 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
957 const u8 *bssid = NULL;
958 u16 reason_code;
959
960 if (len < 24 + 2)
961 return RX_MGMT_NONE;
962
963 ASSERT_MGD_MTX(ifmgd);
964
965 bssid = ifmgd->associated->bssid;
966
967 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
968
969 printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
970 sdata->name, bssid, reason_code);
971
972 ieee80211_set_disassoc(sdata);
973 ieee80211_recalc_idle(sdata->local);
974
975 return RX_MGMT_CFG80211_DEAUTH;
976 }
977
978
979 static enum rx_mgmt_action __must_check
980 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
981 struct ieee80211_mgmt *mgmt, size_t len)
982 {
983 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
984 u16 reason_code;
985
986 if (len < 24 + 2)
987 return RX_MGMT_NONE;
988
989 ASSERT_MGD_MTX(ifmgd);
990
991 if (WARN_ON(!ifmgd->associated))
992 return RX_MGMT_NONE;
993
994 if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
995 return RX_MGMT_NONE;
996
997 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
998
999 printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1000 sdata->name, mgmt->sa, reason_code);
1001
1002 ieee80211_set_disassoc(sdata);
1003 ieee80211_recalc_idle(sdata->local);
1004 return RX_MGMT_CFG80211_DISASSOC;
1005 }
1006
1007
1008 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1009 struct ieee80211_mgmt *mgmt, size_t len)
1010 {
1011 struct ieee80211_sub_if_data *sdata = wk->sdata;
1012 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1013 struct ieee80211_local *local = sdata->local;
1014 struct ieee80211_supported_band *sband;
1015 struct sta_info *sta;
1016 struct cfg80211_bss *cbss = wk->assoc.bss;
1017 u8 *pos;
1018 u32 rates, basic_rates;
1019 u16 capab_info, aid;
1020 struct ieee802_11_elems elems;
1021 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1022 u32 changed = 0;
1023 int i, j, err;
1024 bool have_higher_than_11mbit = false;
1025 u16 ap_ht_cap_flags;
1026
1027 /* AssocResp and ReassocResp have identical structure */
1028
1029 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1030 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1031
1032 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1033 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1034 "set\n", sdata->name, aid);
1035 aid &= ~(BIT(15) | BIT(14));
1036
1037 pos = mgmt->u.assoc_resp.variable;
1038 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1039
1040 if (!elems.supp_rates) {
1041 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1042 sdata->name);
1043 return false;
1044 }
1045
1046 ifmgd->aid = aid;
1047
1048 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1049 if (!sta) {
1050 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1051 " the AP\n", sdata->name);
1052 return false;
1053 }
1054
1055 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1056 WLAN_STA_ASSOC_AP);
1057 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1058 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1059
1060 rates = 0;
1061 basic_rates = 0;
1062 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1063
1064 for (i = 0; i < elems.supp_rates_len; i++) {
1065 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1066 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1067
1068 if (rate > 110)
1069 have_higher_than_11mbit = true;
1070
1071 for (j = 0; j < sband->n_bitrates; j++) {
1072 if (sband->bitrates[j].bitrate == rate) {
1073 rates |= BIT(j);
1074 if (is_basic)
1075 basic_rates |= BIT(j);
1076 break;
1077 }
1078 }
1079 }
1080
1081 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1082 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1083 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1084
1085 if (rate > 110)
1086 have_higher_than_11mbit = true;
1087
1088 for (j = 0; j < sband->n_bitrates; j++) {
1089 if (sband->bitrates[j].bitrate == rate) {
1090 rates |= BIT(j);
1091 if (is_basic)
1092 basic_rates |= BIT(j);
1093 break;
1094 }
1095 }
1096 }
1097
1098 sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1099 sdata->vif.bss_conf.basic_rates = basic_rates;
1100
1101 /* cf. IEEE 802.11 9.2.12 */
1102 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1103 have_higher_than_11mbit)
1104 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1105 else
1106 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1107
1108 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1109 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1110 elems.ht_cap_elem, &sta->sta.ht_cap);
1111
1112 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1113
1114 rate_control_rate_init(sta);
1115
1116 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1117 set_sta_flags(sta, WLAN_STA_MFP);
1118
1119 if (elems.wmm_param)
1120 set_sta_flags(sta, WLAN_STA_WME);
1121
1122 err = sta_info_insert(sta);
1123 sta = NULL;
1124 if (err) {
1125 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1126 " the AP (error %d)\n", sdata->name, err);
1127 return false;
1128 }
1129
1130 if (elems.wmm_param)
1131 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1132 elems.wmm_param_len);
1133 else
1134 ieee80211_set_wmm_default(sdata);
1135
1136 local->oper_channel = wk->chan;
1137
1138 if (elems.ht_info_elem && elems.wmm_param &&
1139 (sdata->local->hw.queues >= 4) &&
1140 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1141 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1142 cbss->bssid, ap_ht_cap_flags);
1143
1144 /* set AID and assoc capability,
1145 * ieee80211_set_associated() will tell the driver */
1146 bss_conf->aid = aid;
1147 bss_conf->assoc_capability = capab_info;
1148 ieee80211_set_associated(sdata, cbss, changed);
1149
1150 /*
1151 * If we're using 4-addr mode, let the AP know that we're
1152 * doing so, so that it can create the STA VLAN on its side
1153 */
1154 if (ifmgd->use_4addr)
1155 ieee80211_send_4addr_nullfunc(local, sdata);
1156
1157 /*
1158 * Start timer to probe the connection to the AP now.
1159 * Also start the timer that will detect beacon loss.
1160 */
1161 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1162 mod_beacon_timer(sdata);
1163
1164 return true;
1165 }
1166
1167
1168 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1169 struct ieee80211_mgmt *mgmt,
1170 size_t len,
1171 struct ieee80211_rx_status *rx_status,
1172 struct ieee802_11_elems *elems,
1173 bool beacon)
1174 {
1175 struct ieee80211_local *local = sdata->local;
1176 int freq;
1177 struct ieee80211_bss *bss;
1178 struct ieee80211_channel *channel;
1179 bool need_ps = false;
1180
1181 if (sdata->u.mgd.associated) {
1182 bss = (void *)sdata->u.mgd.associated->priv;
1183 /* not previously set so we may need to recalc */
1184 need_ps = !bss->dtim_period;
1185 }
1186
1187 if (elems->ds_params && elems->ds_params_len == 1)
1188 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1189 else
1190 freq = rx_status->freq;
1191
1192 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1193
1194 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1195 return;
1196
1197 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1198 channel, beacon);
1199 if (bss)
1200 ieee80211_rx_bss_put(local, bss);
1201
1202 if (!sdata->u.mgd.associated)
1203 return;
1204
1205 if (need_ps) {
1206 mutex_lock(&local->iflist_mtx);
1207 ieee80211_recalc_ps(local, -1);
1208 mutex_unlock(&local->iflist_mtx);
1209 }
1210
1211 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1212 (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1213 ETH_ALEN) == 0)) {
1214 struct ieee80211_channel_sw_ie *sw_elem =
1215 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1216 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1217 }
1218 }
1219
1220
1221 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1222 struct sk_buff *skb)
1223 {
1224 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1225 struct ieee80211_if_managed *ifmgd;
1226 struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1227 size_t baselen, len = skb->len;
1228 struct ieee802_11_elems elems;
1229
1230 ifmgd = &sdata->u.mgd;
1231
1232 ASSERT_MGD_MTX(ifmgd);
1233
1234 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1235 return; /* ignore ProbeResp to foreign address */
1236
1237 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1238 if (baselen > len)
1239 return;
1240
1241 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1242 &elems);
1243
1244 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1245
1246 if (ifmgd->associated &&
1247 memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1248 ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1249 IEEE80211_STA_CONNECTION_POLL)) {
1250 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1251 IEEE80211_STA_BEACON_POLL);
1252 mutex_lock(&sdata->local->iflist_mtx);
1253 ieee80211_recalc_ps(sdata->local, -1);
1254 mutex_unlock(&sdata->local->iflist_mtx);
1255 /*
1256 * We've received a probe response, but are not sure whether
1257 * we have or will be receiving any beacons or data, so let's
1258 * schedule the timers again, just in case.
1259 */
1260 mod_beacon_timer(sdata);
1261 mod_timer(&ifmgd->conn_mon_timer,
1262 round_jiffies_up(jiffies +
1263 IEEE80211_CONNECTION_IDLE_TIME));
1264 }
1265 }
1266
1267 /*
1268 * This is the canonical list of information elements we care about,
1269 * the filter code also gives us all changes to the Microsoft OUI
1270 * (00:50:F2) vendor IE which is used for WMM which we need to track.
1271 *
1272 * We implement beacon filtering in software since that means we can
1273 * avoid processing the frame here and in cfg80211, and userspace
1274 * will not be able to tell whether the hardware supports it or not.
1275 *
1276 * XXX: This list needs to be dynamic -- userspace needs to be able to
1277 * add items it requires. It also needs to be able to tell us to
1278 * look out for other vendor IEs.
1279 */
1280 static const u64 care_about_ies =
1281 (1ULL << WLAN_EID_COUNTRY) |
1282 (1ULL << WLAN_EID_ERP_INFO) |
1283 (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1284 (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1285 (1ULL << WLAN_EID_HT_CAPABILITY) |
1286 (1ULL << WLAN_EID_HT_INFORMATION);
1287
1288 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1289 struct ieee80211_mgmt *mgmt,
1290 size_t len,
1291 struct ieee80211_rx_status *rx_status)
1292 {
1293 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1294 size_t baselen;
1295 struct ieee802_11_elems elems;
1296 struct ieee80211_local *local = sdata->local;
1297 u32 changed = 0;
1298 bool erp_valid, directed_tim = false;
1299 u8 erp_value = 0;
1300 u32 ncrc;
1301 u8 *bssid;
1302
1303 ASSERT_MGD_MTX(ifmgd);
1304
1305 /* Process beacon from the current BSS */
1306 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1307 if (baselen > len)
1308 return;
1309
1310 if (rx_status->freq != local->hw.conf.channel->center_freq)
1311 return;
1312
1313 /*
1314 * We might have received a number of frames, among them a
1315 * disassoc frame and a beacon...
1316 */
1317 if (!ifmgd->associated)
1318 return;
1319
1320 bssid = ifmgd->associated->bssid;
1321
1322 /*
1323 * And in theory even frames from a different AP we were just
1324 * associated to a split-second ago!
1325 */
1326 if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1327 return;
1328
1329 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1330 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1331 if (net_ratelimit()) {
1332 printk(KERN_DEBUG "%s: cancelling probereq poll due "
1333 "to a received beacon\n", sdata->name);
1334 }
1335 #endif
1336 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1337 mutex_lock(&local->iflist_mtx);
1338 ieee80211_recalc_ps(local, -1);
1339 mutex_unlock(&local->iflist_mtx);
1340 }
1341
1342 /*
1343 * Push the beacon loss detection into the future since
1344 * we are processing a beacon from the AP just now.
1345 */
1346 mod_beacon_timer(sdata);
1347
1348 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1349 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1350 len - baselen, &elems,
1351 care_about_ies, ncrc);
1352
1353 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1354 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1355 ifmgd->aid);
1356
1357 if (ncrc != ifmgd->beacon_crc) {
1358 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1359 true);
1360
1361 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1362 elems.wmm_param_len);
1363 }
1364
1365 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1366 if (directed_tim) {
1367 if (local->hw.conf.dynamic_ps_timeout > 0) {
1368 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1369 ieee80211_hw_config(local,
1370 IEEE80211_CONF_CHANGE_PS);
1371 ieee80211_send_nullfunc(local, sdata, 0);
1372 } else {
1373 local->pspolling = true;
1374
1375 /*
1376 * Here is assumed that the driver will be
1377 * able to send ps-poll frame and receive a
1378 * response even though power save mode is
1379 * enabled, but some drivers might require
1380 * to disable power save here. This needs
1381 * to be investigated.
1382 */
1383 ieee80211_send_pspoll(local, sdata);
1384 }
1385 }
1386 }
1387
1388 if (ncrc == ifmgd->beacon_crc)
1389 return;
1390 ifmgd->beacon_crc = ncrc;
1391
1392 if (elems.erp_info && elems.erp_info_len >= 1) {
1393 erp_valid = true;
1394 erp_value = elems.erp_info[0];
1395 } else {
1396 erp_valid = false;
1397 }
1398 changed |= ieee80211_handle_bss_capability(sdata,
1399 le16_to_cpu(mgmt->u.beacon.capab_info),
1400 erp_valid, erp_value);
1401
1402
1403 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1404 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1405 struct sta_info *sta;
1406 struct ieee80211_supported_band *sband;
1407 u16 ap_ht_cap_flags;
1408
1409 rcu_read_lock();
1410
1411 sta = sta_info_get(sdata, bssid);
1412 if (WARN_ON(!sta)) {
1413 rcu_read_unlock();
1414 return;
1415 }
1416
1417 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1418
1419 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1420 elems.ht_cap_elem, &sta->sta.ht_cap);
1421
1422 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1423
1424 rcu_read_unlock();
1425
1426 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1427 bssid, ap_ht_cap_flags);
1428 }
1429
1430 /* Note: country IE parsing is done for us by cfg80211 */
1431 if (elems.country_elem) {
1432 /* TODO: IBSS also needs this */
1433 if (elems.pwr_constr_elem)
1434 ieee80211_handle_pwr_constr(sdata,
1435 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1436 elems.pwr_constr_elem,
1437 elems.pwr_constr_elem_len);
1438 }
1439
1440 ieee80211_bss_info_change_notify(sdata, changed);
1441 }
1442
1443 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1444 struct sk_buff *skb)
1445 {
1446 struct ieee80211_local *local = sdata->local;
1447 struct ieee80211_mgmt *mgmt;
1448 u16 fc;
1449
1450 if (skb->len < 24)
1451 return RX_DROP_MONITOR;
1452
1453 mgmt = (struct ieee80211_mgmt *) skb->data;
1454 fc = le16_to_cpu(mgmt->frame_control);
1455
1456 switch (fc & IEEE80211_FCTL_STYPE) {
1457 case IEEE80211_STYPE_PROBE_RESP:
1458 case IEEE80211_STYPE_BEACON:
1459 case IEEE80211_STYPE_DEAUTH:
1460 case IEEE80211_STYPE_DISASSOC:
1461 case IEEE80211_STYPE_ACTION:
1462 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1463 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
1464 return RX_QUEUED;
1465 }
1466
1467 return RX_DROP_MONITOR;
1468 }
1469
1470 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1471 struct sk_buff *skb)
1472 {
1473 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1474 struct ieee80211_rx_status *rx_status;
1475 struct ieee80211_mgmt *mgmt;
1476 enum rx_mgmt_action rma = RX_MGMT_NONE;
1477 u16 fc;
1478
1479 rx_status = (struct ieee80211_rx_status *) skb->cb;
1480 mgmt = (struct ieee80211_mgmt *) skb->data;
1481 fc = le16_to_cpu(mgmt->frame_control);
1482
1483 mutex_lock(&ifmgd->mtx);
1484
1485 if (ifmgd->associated &&
1486 memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1487 switch (fc & IEEE80211_FCTL_STYPE) {
1488 case IEEE80211_STYPE_BEACON:
1489 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1490 rx_status);
1491 break;
1492 case IEEE80211_STYPE_PROBE_RESP:
1493 ieee80211_rx_mgmt_probe_resp(sdata, skb);
1494 break;
1495 case IEEE80211_STYPE_DEAUTH:
1496 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1497 break;
1498 case IEEE80211_STYPE_DISASSOC:
1499 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1500 break;
1501 case IEEE80211_STYPE_ACTION:
1502 if (mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
1503 break;
1504
1505 ieee80211_sta_process_chanswitch(sdata,
1506 &mgmt->u.action.u.chan_switch.sw_elem,
1507 (void *)ifmgd->associated->priv);
1508 break;
1509 }
1510 mutex_unlock(&ifmgd->mtx);
1511
1512 switch (rma) {
1513 case RX_MGMT_NONE:
1514 /* no action */
1515 break;
1516 case RX_MGMT_CFG80211_DEAUTH:
1517 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1518 break;
1519 case RX_MGMT_CFG80211_DISASSOC:
1520 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1521 break;
1522 default:
1523 WARN(1, "unexpected: %d", rma);
1524 }
1525 goto out;
1526 }
1527
1528 mutex_unlock(&ifmgd->mtx);
1529
1530 if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1531 (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH)
1532 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1533
1534 out:
1535 kfree_skb(skb);
1536 }
1537
1538 static void ieee80211_sta_timer(unsigned long data)
1539 {
1540 struct ieee80211_sub_if_data *sdata =
1541 (struct ieee80211_sub_if_data *) data;
1542 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1543 struct ieee80211_local *local = sdata->local;
1544
1545 if (local->quiescing) {
1546 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1547 return;
1548 }
1549
1550 ieee80211_queue_work(&local->hw, &ifmgd->work);
1551 }
1552
1553 static void ieee80211_sta_work(struct work_struct *work)
1554 {
1555 struct ieee80211_sub_if_data *sdata =
1556 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1557 struct ieee80211_local *local = sdata->local;
1558 struct ieee80211_if_managed *ifmgd;
1559 struct sk_buff *skb;
1560
1561 if (!ieee80211_sdata_running(sdata))
1562 return;
1563
1564 if (local->scanning)
1565 return;
1566
1567 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1568 return;
1569
1570 /*
1571 * ieee80211_queue_work() should have picked up most cases,
1572 * here we'll pick the the rest.
1573 */
1574 if (WARN(local->suspended, "STA MLME work scheduled while "
1575 "going to suspend\n"))
1576 return;
1577
1578 ifmgd = &sdata->u.mgd;
1579
1580 /* first process frames to avoid timing out while a frame is pending */
1581 while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1582 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1583
1584 /* then process the rest of the work */
1585 mutex_lock(&ifmgd->mtx);
1586
1587 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1588 IEEE80211_STA_CONNECTION_POLL) &&
1589 ifmgd->associated) {
1590 u8 bssid[ETH_ALEN];
1591
1592 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1593 if (time_is_after_jiffies(ifmgd->probe_timeout))
1594 run_again(ifmgd, ifmgd->probe_timeout);
1595
1596 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1597 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1598 printk(KERN_DEBUG "No probe response from AP %pM"
1599 " after %dms, try %d\n", bssid,
1600 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1601 ifmgd->probe_send_count);
1602 #endif
1603 ieee80211_mgd_probe_ap_send(sdata);
1604 } else {
1605 /*
1606 * We actually lost the connection ... or did we?
1607 * Let's make sure!
1608 */
1609 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1610 IEEE80211_STA_BEACON_POLL);
1611 printk(KERN_DEBUG "No probe response from AP %pM"
1612 " after %dms, disconnecting.\n",
1613 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1614 ieee80211_set_disassoc(sdata);
1615 ieee80211_recalc_idle(local);
1616 mutex_unlock(&ifmgd->mtx);
1617 /*
1618 * must be outside lock due to cfg80211,
1619 * but that's not a problem.
1620 */
1621 ieee80211_send_deauth_disassoc(sdata, bssid,
1622 IEEE80211_STYPE_DEAUTH,
1623 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1624 NULL);
1625 mutex_lock(&ifmgd->mtx);
1626 }
1627 }
1628
1629 mutex_unlock(&ifmgd->mtx);
1630 }
1631
1632 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1633 {
1634 struct ieee80211_sub_if_data *sdata =
1635 (struct ieee80211_sub_if_data *) data;
1636 struct ieee80211_local *local = sdata->local;
1637
1638 if (local->quiescing)
1639 return;
1640
1641 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
1642 }
1643
1644 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1645 {
1646 struct ieee80211_sub_if_data *sdata =
1647 (struct ieee80211_sub_if_data *) data;
1648 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1649 struct ieee80211_local *local = sdata->local;
1650
1651 if (local->quiescing)
1652 return;
1653
1654 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1655 }
1656
1657 static void ieee80211_sta_monitor_work(struct work_struct *work)
1658 {
1659 struct ieee80211_sub_if_data *sdata =
1660 container_of(work, struct ieee80211_sub_if_data,
1661 u.mgd.monitor_work);
1662
1663 ieee80211_mgd_probe_ap(sdata, false);
1664 }
1665
1666 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1667 {
1668 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1669 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1670 IEEE80211_STA_CONNECTION_POLL);
1671
1672 /* let's probe the connection once */
1673 ieee80211_queue_work(&sdata->local->hw,
1674 &sdata->u.mgd.monitor_work);
1675 /* and do all the other regular work too */
1676 ieee80211_queue_work(&sdata->local->hw,
1677 &sdata->u.mgd.work);
1678 }
1679 }
1680
1681 #ifdef CONFIG_PM
1682 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1683 {
1684 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1685
1686 /*
1687 * we need to use atomic bitops for the running bits
1688 * only because both timers might fire at the same
1689 * time -- the code here is properly synchronised.
1690 */
1691
1692 cancel_work_sync(&ifmgd->work);
1693 cancel_work_sync(&ifmgd->beacon_loss_work);
1694 if (del_timer_sync(&ifmgd->timer))
1695 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1696
1697 cancel_work_sync(&ifmgd->chswitch_work);
1698 if (del_timer_sync(&ifmgd->chswitch_timer))
1699 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1700
1701 cancel_work_sync(&ifmgd->monitor_work);
1702 /* these will just be re-established on connection */
1703 del_timer_sync(&ifmgd->conn_mon_timer);
1704 del_timer_sync(&ifmgd->bcn_mon_timer);
1705 }
1706
1707 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1708 {
1709 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1710
1711 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1712 add_timer(&ifmgd->timer);
1713 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1714 add_timer(&ifmgd->chswitch_timer);
1715 }
1716 #endif
1717
1718 /* interface setup */
1719 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1720 {
1721 struct ieee80211_if_managed *ifmgd;
1722
1723 ifmgd = &sdata->u.mgd;
1724 INIT_WORK(&ifmgd->work, ieee80211_sta_work);
1725 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1726 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1727 INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
1728 setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1729 (unsigned long) sdata);
1730 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1731 (unsigned long) sdata);
1732 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1733 (unsigned long) sdata);
1734 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1735 (unsigned long) sdata);
1736 skb_queue_head_init(&ifmgd->skb_queue);
1737
1738 ifmgd->flags = 0;
1739
1740 mutex_init(&ifmgd->mtx);
1741
1742 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1743 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1744 else
1745 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1746 }
1747
1748 /* scan finished notification */
1749 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1750 {
1751 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1752
1753 /* Restart STA timers */
1754 rcu_read_lock();
1755 list_for_each_entry_rcu(sdata, &local->interfaces, list)
1756 ieee80211_restart_sta_timer(sdata);
1757 rcu_read_unlock();
1758 }
1759
1760 int ieee80211_max_network_latency(struct notifier_block *nb,
1761 unsigned long data, void *dummy)
1762 {
1763 s32 latency_usec = (s32) data;
1764 struct ieee80211_local *local =
1765 container_of(nb, struct ieee80211_local,
1766 network_latency_notifier);
1767
1768 mutex_lock(&local->iflist_mtx);
1769 ieee80211_recalc_ps(local, latency_usec);
1770 mutex_unlock(&local->iflist_mtx);
1771
1772 return 0;
1773 }
1774
1775 /* config hooks */
1776 static enum work_done_result
1777 ieee80211_probe_auth_done(struct ieee80211_work *wk,
1778 struct sk_buff *skb)
1779 {
1780 if (!skb) {
1781 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
1782 return WORK_DONE_DESTROY;
1783 }
1784
1785 if (wk->type == IEEE80211_WORK_AUTH) {
1786 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
1787 return WORK_DONE_DESTROY;
1788 }
1789
1790 mutex_lock(&wk->sdata->u.mgd.mtx);
1791 ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
1792 mutex_unlock(&wk->sdata->u.mgd.mtx);
1793
1794 wk->type = IEEE80211_WORK_AUTH;
1795 wk->probe_auth.tries = 0;
1796 return WORK_DONE_REQUEUE;
1797 }
1798
1799 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
1800 struct cfg80211_auth_request *req)
1801 {
1802 const u8 *ssid;
1803 struct ieee80211_work *wk;
1804 u16 auth_alg;
1805
1806 switch (req->auth_type) {
1807 case NL80211_AUTHTYPE_OPEN_SYSTEM:
1808 auth_alg = WLAN_AUTH_OPEN;
1809 break;
1810 case NL80211_AUTHTYPE_SHARED_KEY:
1811 auth_alg = WLAN_AUTH_SHARED_KEY;
1812 break;
1813 case NL80211_AUTHTYPE_FT:
1814 auth_alg = WLAN_AUTH_FT;
1815 break;
1816 case NL80211_AUTHTYPE_NETWORK_EAP:
1817 auth_alg = WLAN_AUTH_LEAP;
1818 break;
1819 default:
1820 return -EOPNOTSUPP;
1821 }
1822
1823 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1824 if (!wk)
1825 return -ENOMEM;
1826
1827 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1828
1829 if (req->ie && req->ie_len) {
1830 memcpy(wk->ie, req->ie, req->ie_len);
1831 wk->ie_len = req->ie_len;
1832 }
1833
1834 if (req->key && req->key_len) {
1835 wk->probe_auth.key_len = req->key_len;
1836 wk->probe_auth.key_idx = req->key_idx;
1837 memcpy(wk->probe_auth.key, req->key, req->key_len);
1838 }
1839
1840 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1841 memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
1842 wk->probe_auth.ssid_len = ssid[1];
1843
1844 wk->probe_auth.algorithm = auth_alg;
1845 wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
1846
1847 /* if we already have a probe, don't probe again */
1848 if (req->bss->proberesp_ies)
1849 wk->type = IEEE80211_WORK_AUTH;
1850 else
1851 wk->type = IEEE80211_WORK_DIRECT_PROBE;
1852 wk->chan = req->bss->channel;
1853 wk->sdata = sdata;
1854 wk->done = ieee80211_probe_auth_done;
1855
1856 ieee80211_add_work(wk);
1857 return 0;
1858 }
1859
1860 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
1861 struct sk_buff *skb)
1862 {
1863 struct ieee80211_mgmt *mgmt;
1864 u16 status;
1865
1866 if (!skb) {
1867 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
1868 return WORK_DONE_DESTROY;
1869 }
1870
1871 mgmt = (void *)skb->data;
1872 status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1873
1874 if (status == WLAN_STATUS_SUCCESS) {
1875 mutex_lock(&wk->sdata->u.mgd.mtx);
1876 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
1877 mutex_unlock(&wk->sdata->u.mgd.mtx);
1878 /* oops -- internal error -- send timeout for now */
1879 cfg80211_send_assoc_timeout(wk->sdata->dev,
1880 wk->filter_ta);
1881 return WORK_DONE_DESTROY;
1882 }
1883 mutex_unlock(&wk->sdata->u.mgd.mtx);
1884 }
1885
1886 cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
1887 return WORK_DONE_DESTROY;
1888 }
1889
1890 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
1891 struct cfg80211_assoc_request *req)
1892 {
1893 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1894 struct ieee80211_bss *bss = (void *)req->bss->priv;
1895 struct ieee80211_work *wk;
1896 const u8 *ssid;
1897 int i;
1898
1899 mutex_lock(&ifmgd->mtx);
1900 if (ifmgd->associated) {
1901 if (!req->prev_bssid ||
1902 memcmp(req->prev_bssid, ifmgd->associated->bssid,
1903 ETH_ALEN)) {
1904 /*
1905 * We are already associated and the request was not a
1906 * reassociation request from the current BSS, so
1907 * reject it.
1908 */
1909 mutex_unlock(&ifmgd->mtx);
1910 return -EALREADY;
1911 }
1912
1913 /* Trying to reassociate - clear previous association state */
1914 ieee80211_set_disassoc(sdata);
1915 }
1916 mutex_unlock(&ifmgd->mtx);
1917
1918 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1919 if (!wk)
1920 return -ENOMEM;
1921
1922 ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
1923 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1924
1925 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
1926 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
1927 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
1928 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
1929 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
1930
1931
1932 if (req->ie && req->ie_len) {
1933 memcpy(wk->ie, req->ie, req->ie_len);
1934 wk->ie_len = req->ie_len;
1935 } else
1936 wk->ie_len = 0;
1937
1938 wk->assoc.bss = req->bss;
1939
1940 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1941
1942 /* new association always uses requested smps mode */
1943 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
1944 if (ifmgd->powersave)
1945 ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
1946 else
1947 ifmgd->ap_smps = IEEE80211_SMPS_OFF;
1948 } else
1949 ifmgd->ap_smps = ifmgd->req_smps;
1950
1951 wk->assoc.smps = ifmgd->ap_smps;
1952 /*
1953 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
1954 * We still associate in non-HT mode (11a/b/g) if any one of these
1955 * ciphers is configured as pairwise.
1956 * We can set this to true for non-11n hardware, that'll be checked
1957 * separately along with the peer capabilities.
1958 */
1959 wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
1960 wk->assoc.capability = req->bss->capability;
1961 wk->assoc.wmm_used = bss->wmm_used;
1962 wk->assoc.supp_rates = bss->supp_rates;
1963 wk->assoc.supp_rates_len = bss->supp_rates_len;
1964 wk->assoc.ht_information_ie =
1965 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
1966
1967 if (bss->wmm_used && bss->uapsd_supported &&
1968 (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
1969 wk->assoc.uapsd_used = true;
1970 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
1971 } else {
1972 wk->assoc.uapsd_used = false;
1973 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
1974 }
1975
1976 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1977 memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
1978 wk->assoc.ssid_len = ssid[1];
1979
1980 if (req->prev_bssid)
1981 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
1982
1983 wk->type = IEEE80211_WORK_ASSOC;
1984 wk->chan = req->bss->channel;
1985 wk->sdata = sdata;
1986 wk->done = ieee80211_assoc_done;
1987
1988 if (req->use_mfp) {
1989 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
1990 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
1991 } else {
1992 ifmgd->mfp = IEEE80211_MFP_DISABLED;
1993 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
1994 }
1995
1996 if (req->crypto.control_port)
1997 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
1998 else
1999 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2000
2001 ieee80211_add_work(wk);
2002 return 0;
2003 }
2004
2005 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2006 struct cfg80211_deauth_request *req,
2007 void *cookie)
2008 {
2009 struct ieee80211_local *local = sdata->local;
2010 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2011 struct ieee80211_work *wk;
2012 const u8 *bssid = req->bss->bssid;
2013
2014 mutex_lock(&ifmgd->mtx);
2015
2016 if (ifmgd->associated == req->bss) {
2017 bssid = req->bss->bssid;
2018 ieee80211_set_disassoc(sdata);
2019 mutex_unlock(&ifmgd->mtx);
2020 } else {
2021 bool not_auth_yet = false;
2022
2023 mutex_unlock(&ifmgd->mtx);
2024
2025 mutex_lock(&local->work_mtx);
2026 list_for_each_entry(wk, &local->work_list, list) {
2027 if (wk->sdata != sdata)
2028 continue;
2029
2030 if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2031 wk->type != IEEE80211_WORK_AUTH)
2032 continue;
2033
2034 if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2035 continue;
2036
2037 not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2038 list_del_rcu(&wk->list);
2039 free_work(wk);
2040 break;
2041 }
2042 mutex_unlock(&local->work_mtx);
2043
2044 /*
2045 * If somebody requests authentication and we haven't
2046 * sent out an auth frame yet there's no need to send
2047 * out a deauth frame either. If the state was PROBE,
2048 * then this is the case. If it's AUTH we have sent a
2049 * frame, and if it's IDLE we have completed the auth
2050 * process already.
2051 */
2052 if (not_auth_yet) {
2053 __cfg80211_auth_canceled(sdata->dev, bssid);
2054 return 0;
2055 }
2056 }
2057
2058 printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2059 sdata->name, bssid, req->reason_code);
2060
2061 ieee80211_send_deauth_disassoc(sdata, bssid,
2062 IEEE80211_STYPE_DEAUTH, req->reason_code,
2063 cookie);
2064
2065 ieee80211_recalc_idle(sdata->local);
2066
2067 return 0;
2068 }
2069
2070 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2071 struct cfg80211_disassoc_request *req,
2072 void *cookie)
2073 {
2074 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2075
2076 mutex_lock(&ifmgd->mtx);
2077
2078 /*
2079 * cfg80211 should catch this ... but it's racy since
2080 * we can receive a disassoc frame, process it, hand it
2081 * to cfg80211 while that's in a locked section already
2082 * trying to tell us that the user wants to disconnect.
2083 */
2084 if (ifmgd->associated != req->bss) {
2085 mutex_unlock(&ifmgd->mtx);
2086 return -ENOLINK;
2087 }
2088
2089 printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2090 sdata->name, req->bss->bssid, req->reason_code);
2091
2092 ieee80211_set_disassoc(sdata);
2093
2094 mutex_unlock(&ifmgd->mtx);
2095
2096 ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2097 IEEE80211_STYPE_DISASSOC, req->reason_code,
2098 cookie);
2099
2100 ieee80211_recalc_idle(sdata->local);
2101
2102 return 0;
2103 }
2104
2105 int ieee80211_mgd_action(struct ieee80211_sub_if_data *sdata,
2106 struct ieee80211_channel *chan,
2107 enum nl80211_channel_type channel_type,
2108 const u8 *buf, size_t len, u64 *cookie)
2109 {
2110 struct ieee80211_local *local = sdata->local;
2111 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2112 struct sk_buff *skb;
2113
2114 /* Check that we are on the requested channel for transmission */
2115 if ((chan != local->tmp_channel ||
2116 channel_type != local->tmp_channel_type) &&
2117 (chan != local->oper_channel ||
2118 channel_type != local->oper_channel_type))
2119 return -EBUSY;
2120
2121 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len);
2122 if (!skb)
2123 return -ENOMEM;
2124 skb_reserve(skb, local->hw.extra_tx_headroom);
2125
2126 memcpy(skb_put(skb, len), buf, len);
2127
2128 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
2129 IEEE80211_SKB_CB(skb)->flags |=
2130 IEEE80211_TX_INTFL_DONT_ENCRYPT;
2131 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX |
2132 IEEE80211_TX_CTL_REQ_TX_STATUS;
2133 skb->dev = sdata->dev;
2134 ieee80211_tx_skb(sdata, skb);
2135
2136 *cookie = (unsigned long) skb;
2137 return 0;
2138 }
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