/net/mac80211/mlme.c
C | 2141 lines | 1516 code | 392 blank | 233 comment | 279 complexity | 28f4deaceab71fbdc5f5a780a0e81374 MD5 | raw file
Possible License(s): CC-BY-SA-3.0, GPL-2.0, LGPL-2.0, AGPL-1.0
Large files files are truncated, but you can click here to view the full file
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 */
59enum 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 */
80static 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 */
95static 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
105static 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
114static 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 */
124static 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 if (local->tmp_channel)
172 local->tmp_channel_type = channel_type;
173 local->oper_channel_type = channel_type;
174
175 if (ht_changed) {
176 /* channel_type change automatically detected */
177 ieee80211_hw_config(local, 0);
178
179 rcu_read_lock();
180 sta = sta_info_get(sdata, bssid);
181 if (sta)
182 rate_control_rate_update(local, sband, sta,
183 IEEE80211_RC_HT_CHANGED,
184 local->oper_channel_type);
185 rcu_read_unlock();
186 }
187
188 /* disable HT */
189 if (!enable_ht)
190 return 0;
191
192 ht_opmode = le16_to_cpu(hti->operation_mode);
193
194 /* if bss configuration changed store the new one */
195 if (!sdata->ht_opmode_valid ||
196 sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
197 changed |= BSS_CHANGED_HT;
198 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
199 sdata->ht_opmode_valid = true;
200 }
201
202 return changed;
203}
204
205/* frame sending functions */
206
207static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
208 const u8 *bssid, u16 stype, u16 reason,
209 void *cookie)
210{
211 struct ieee80211_local *local = sdata->local;
212 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
213 struct sk_buff *skb;
214 struct ieee80211_mgmt *mgmt;
215
216 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
217 if (!skb) {
218 printk(KERN_DEBUG "%s: failed to allocate buffer for "
219 "deauth/disassoc frame\n", sdata->name);
220 return;
221 }
222 skb_reserve(skb, local->hw.extra_tx_headroom);
223
224 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
225 memset(mgmt, 0, 24);
226 memcpy(mgmt->da, bssid, ETH_ALEN);
227 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
228 memcpy(mgmt->bssid, bssid, ETH_ALEN);
229 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
230 skb_put(skb, 2);
231 /* u.deauth.reason_code == u.disassoc.reason_code */
232 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
233
234 if (stype == IEEE80211_STYPE_DEAUTH)
235 if (cookie)
236 __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
237 else
238 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
239 else
240 if (cookie)
241 __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
242 else
243 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
244 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
245 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
246 ieee80211_tx_skb(sdata, skb);
247}
248
249void ieee80211_send_pspoll(struct ieee80211_local *local,
250 struct ieee80211_sub_if_data *sdata)
251{
252 struct ieee80211_pspoll *pspoll;
253 struct sk_buff *skb;
254
255 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
256 if (!skb)
257 return;
258
259 pspoll = (struct ieee80211_pspoll *) skb->data;
260 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
261
262 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
263 ieee80211_tx_skb(sdata, skb);
264}
265
266void ieee80211_send_nullfunc(struct ieee80211_local *local,
267 struct ieee80211_sub_if_data *sdata,
268 int powersave)
269{
270 struct sk_buff *skb;
271 struct ieee80211_hdr_3addr *nullfunc;
272
273 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
274 if (!skb)
275 return;
276
277 nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
278 if (powersave)
279 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
280
281 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
282 ieee80211_tx_skb(sdata, skb);
283}
284
285static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
286 struct ieee80211_sub_if_data *sdata)
287{
288 struct sk_buff *skb;
289 struct ieee80211_hdr *nullfunc;
290 __le16 fc;
291
292 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
293 return;
294
295 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
296 if (!skb) {
297 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
298 "nullfunc frame\n", sdata->name);
299 return;
300 }
301 skb_reserve(skb, local->hw.extra_tx_headroom);
302
303 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
304 memset(nullfunc, 0, 30);
305 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
306 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
307 nullfunc->frame_control = fc;
308 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
309 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
310 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
311 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
312
313 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
314 ieee80211_tx_skb(sdata, skb);
315}
316
317/* spectrum management related things */
318static void ieee80211_chswitch_work(struct work_struct *work)
319{
320 struct ieee80211_sub_if_data *sdata =
321 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
322 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
323
324 if (!ieee80211_sdata_running(sdata))
325 return;
326
327 mutex_lock(&ifmgd->mtx);
328 if (!ifmgd->associated)
329 goto out;
330
331 sdata->local->oper_channel = sdata->local->csa_channel;
332 ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL);
333
334 /* XXX: shouldn't really modify cfg80211-owned data! */
335 ifmgd->associated->channel = sdata->local->oper_channel;
336
337 ieee80211_wake_queues_by_reason(&sdata->local->hw,
338 IEEE80211_QUEUE_STOP_REASON_CSA);
339 out:
340 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
341 mutex_unlock(&ifmgd->mtx);
342}
343
344static void ieee80211_chswitch_timer(unsigned long data)
345{
346 struct ieee80211_sub_if_data *sdata =
347 (struct ieee80211_sub_if_data *) data;
348 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
349
350 if (sdata->local->quiescing) {
351 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
352 return;
353 }
354
355 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
356}
357
358void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
359 struct ieee80211_channel_sw_ie *sw_elem,
360 struct ieee80211_bss *bss)
361{
362 struct cfg80211_bss *cbss =
363 container_of((void *)bss, struct cfg80211_bss, priv);
364 struct ieee80211_channel *new_ch;
365 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
366 int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
367
368 ASSERT_MGD_MTX(ifmgd);
369
370 if (!ifmgd->associated)
371 return;
372
373 if (sdata->local->scanning)
374 return;
375
376 /* Disregard subsequent beacons if we are already running a timer
377 processing a CSA */
378
379 if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
380 return;
381
382 new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
383 if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
384 return;
385
386 sdata->local->csa_channel = new_ch;
387
388 if (sw_elem->count <= 1) {
389 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
390 } else {
391 ieee80211_stop_queues_by_reason(&sdata->local->hw,
392 IEEE80211_QUEUE_STOP_REASON_CSA);
393 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
394 mod_timer(&ifmgd->chswitch_timer,
395 jiffies +
396 msecs_to_jiffies(sw_elem->count *
397 cbss->beacon_interval));
398 }
399}
400
401static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
402 u16 capab_info, u8 *pwr_constr_elem,
403 u8 pwr_constr_elem_len)
404{
405 struct ieee80211_conf *conf = &sdata->local->hw.conf;
406
407 if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
408 return;
409
410 /* Power constraint IE length should be 1 octet */
411 if (pwr_constr_elem_len != 1)
412 return;
413
414 if ((*pwr_constr_elem <= conf->channel->max_power) &&
415 (*pwr_constr_elem != sdata->local->power_constr_level)) {
416 sdata->local->power_constr_level = *pwr_constr_elem;
417 ieee80211_hw_config(sdata->local, 0);
418 }
419}
420
421/* powersave */
422static void ieee80211_enable_ps(struct ieee80211_local *local,
423 struct ieee80211_sub_if_data *sdata)
424{
425 struct ieee80211_conf *conf = &local->hw.conf;
426
427 /*
428 * If we are scanning right now then the parameters will
429 * take effect when scan finishes.
430 */
431 if (local->scanning)
432 return;
433
434 if (conf->dynamic_ps_timeout > 0 &&
435 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
436 mod_timer(&local->dynamic_ps_timer, jiffies +
437 msecs_to_jiffies(conf->dynamic_ps_timeout));
438 } else {
439 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
440 ieee80211_send_nullfunc(local, sdata, 1);
441
442 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
443 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
444 return;
445
446 conf->flags |= IEEE80211_CONF_PS;
447 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
448 }
449}
450
451static void ieee80211_change_ps(struct ieee80211_local *local)
452{
453 struct ieee80211_conf *conf = &local->hw.conf;
454
455 if (local->ps_sdata) {
456 ieee80211_enable_ps(local, local->ps_sdata);
457 } else if (conf->flags & IEEE80211_CONF_PS) {
458 conf->flags &= ~IEEE80211_CONF_PS;
459 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
460 del_timer_sync(&local->dynamic_ps_timer);
461 cancel_work_sync(&local->dynamic_ps_enable_work);
462 }
463}
464
465/* need to hold RTNL or interface lock */
466void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
467{
468 struct ieee80211_sub_if_data *sdata, *found = NULL;
469 int count = 0;
470
471 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
472 local->ps_sdata = NULL;
473 return;
474 }
475
476 if (!list_empty(&local->work_list)) {
477 local->ps_sdata = NULL;
478 goto change;
479 }
480
481 list_for_each_entry(sdata, &local->interfaces, list) {
482 if (!ieee80211_sdata_running(sdata))
483 continue;
484 if (sdata->vif.type != NL80211_IFTYPE_STATION)
485 continue;
486 found = sdata;
487 count++;
488 }
489
490 if (count == 1 && found->u.mgd.powersave &&
491 found->u.mgd.associated &&
492 found->u.mgd.associated->beacon_ies &&
493 !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
494 IEEE80211_STA_CONNECTION_POLL))) {
495 s32 beaconint_us;
496
497 if (latency < 0)
498 latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
499
500 beaconint_us = ieee80211_tu_to_usec(
501 found->vif.bss_conf.beacon_int);
502
503 if (beaconint_us > latency) {
504 local->ps_sdata = NULL;
505 } else {
506 struct ieee80211_bss *bss;
507 int maxslp = 1;
508 u8 dtimper;
509
510 bss = (void *)found->u.mgd.associated->priv;
511 dtimper = bss->dtim_period;
512
513 /* If the TIM IE is invalid, pretend the value is 1 */
514 if (!dtimper)
515 dtimper = 1;
516 else if (dtimper > 1)
517 maxslp = min_t(int, dtimper,
518 latency / beaconint_us);
519
520 local->hw.conf.max_sleep_period = maxslp;
521 local->hw.conf.ps_dtim_period = dtimper;
522 local->ps_sdata = found;
523 }
524 } else {
525 local->ps_sdata = NULL;
526 }
527
528 change:
529 ieee80211_change_ps(local);
530}
531
532void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
533{
534 struct ieee80211_local *local =
535 container_of(work, struct ieee80211_local,
536 dynamic_ps_disable_work);
537
538 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
539 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
540 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
541 }
542
543 ieee80211_wake_queues_by_reason(&local->hw,
544 IEEE80211_QUEUE_STOP_REASON_PS);
545}
546
547void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
548{
549 struct ieee80211_local *local =
550 container_of(work, struct ieee80211_local,
551 dynamic_ps_enable_work);
552 struct ieee80211_sub_if_data *sdata = local->ps_sdata;
553 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
554
555 /* can only happen when PS was just disabled anyway */
556 if (!sdata)
557 return;
558
559 if (local->hw.conf.flags & IEEE80211_CONF_PS)
560 return;
561
562 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
563 (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
564 ieee80211_send_nullfunc(local, sdata, 1);
565
566 if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
567 (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
568 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
569 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
570 local->hw.conf.flags |= IEEE80211_CONF_PS;
571 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
572 }
573}
574
575void ieee80211_dynamic_ps_timer(unsigned long data)
576{
577 struct ieee80211_local *local = (void *) data;
578
579 if (local->quiescing || local->suspended)
580 return;
581
582 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
583}
584
585/* MLME */
586static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
587 struct ieee80211_if_managed *ifmgd,
588 u8 *wmm_param, size_t wmm_param_len)
589{
590 struct ieee80211_tx_queue_params params;
591 size_t left;
592 int count;
593 u8 *pos, uapsd_queues = 0;
594
595 if (local->hw.queues < 4)
596 return;
597
598 if (!wmm_param)
599 return;
600
601 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
602 return;
603
604 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
605 uapsd_queues = local->uapsd_queues;
606
607 count = wmm_param[6] & 0x0f;
608 if (count == ifmgd->wmm_last_param_set)
609 return;
610 ifmgd->wmm_last_param_set = count;
611
612 pos = wmm_param + 8;
613 left = wmm_param_len - 8;
614
615 memset(¶ms, 0, sizeof(params));
616
617 local->wmm_acm = 0;
618 for (; left >= 4; left -= 4, pos += 4) {
619 int aci = (pos[0] >> 5) & 0x03;
620 int acm = (pos[0] >> 4) & 0x01;
621 bool uapsd = false;
622 int queue;
623
624 switch (aci) {
625 case 1: /* AC_BK */
626 queue = 3;
627 if (acm)
628 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
629 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
630 uapsd = true;
631 break;
632 case 2: /* AC_VI */
633 queue = 1;
634 if (acm)
635 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
636 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
637 uapsd = true;
638 break;
639 case 3: /* AC_VO */
640 queue = 0;
641 if (acm)
642 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
643 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
644 uapsd = true;
645 break;
646 case 0: /* AC_BE */
647 default:
648 queue = 2;
649 if (acm)
650 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
651 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
652 uapsd = true;
653 break;
654 }
655
656 params.aifs = pos[0] & 0x0f;
657 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
658 params.cw_min = ecw2cw(pos[1] & 0x0f);
659 params.txop = get_unaligned_le16(pos + 2);
660 params.uapsd = uapsd;
661
662#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
663 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
664 "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
665 wiphy_name(local->hw.wiphy), queue, aci, acm,
666 params.aifs, params.cw_min, params.cw_max, params.txop,
667 params.uapsd);
668#endif
669 if (drv_conf_tx(local, queue, ¶ms) && local->ops->conf_tx)
670 printk(KERN_DEBUG "%s: failed to set TX queue "
671 "parameters for queue %d\n",
672 wiphy_name(local->hw.wiphy), queue);
673 }
674}
675
676static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
677 u16 capab, bool erp_valid, u8 erp)
678{
679 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
680 u32 changed = 0;
681 bool use_protection;
682 bool use_short_preamble;
683 bool use_short_slot;
684
685 if (erp_valid) {
686 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
687 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
688 } else {
689 use_protection = false;
690 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
691 }
692
693 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
694 if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
695 use_short_slot = true;
696
697 if (use_protection != bss_conf->use_cts_prot) {
698 bss_conf->use_cts_prot = use_protection;
699 changed |= BSS_CHANGED_ERP_CTS_PROT;
700 }
701
702 if (use_short_preamble != bss_conf->use_short_preamble) {
703 bss_conf->use_short_preamble = use_short_preamble;
704 changed |= BSS_CHANGED_ERP_PREAMBLE;
705 }
706
707 if (use_short_slot != bss_conf->use_short_slot) {
708 bss_conf->use_short_slot = use_short_slot;
709 changed |= BSS_CHANGED_ERP_SLOT;
710 }
711
712 return changed;
713}
714
715static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
716 struct cfg80211_bss *cbss,
717 u32 bss_info_changed)
718{
719 struct ieee80211_bss *bss = (void *)cbss->priv;
720 struct ieee80211_local *local = sdata->local;
721
722 bss_info_changed |= BSS_CHANGED_ASSOC;
723 /* set timing information */
724 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
725 sdata->vif.bss_conf.timestamp = cbss->tsf;
726
727 bss_info_changed |= BSS_CHANGED_BEACON_INT;
728 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
729 cbss->capability, bss->has_erp_value, bss->erp_value);
730
731 sdata->u.mgd.associated = cbss;
732 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
733
734 /* just to be sure */
735 sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
736 IEEE80211_STA_BEACON_POLL);
737
738 /*
739 * Always handle WMM once after association regardless
740 * of the first value the AP uses. Setting -1 here has
741 * that effect because the AP values is an unsigned
742 * 4-bit value.
743 */
744 sdata->u.mgd.wmm_last_param_set = -1;
745
746 ieee80211_led_assoc(local, 1);
747
748 sdata->vif.bss_conf.assoc = 1;
749 /*
750 * For now just always ask the driver to update the basic rateset
751 * when we have associated, we aren't checking whether it actually
752 * changed or not.
753 */
754 bss_info_changed |= BSS_CHANGED_BASIC_RATES;
755
756 /* And the BSSID changed - we're associated now */
757 bss_info_changed |= BSS_CHANGED_BSSID;
758
759 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
760
761 mutex_lock(&local->iflist_mtx);
762 ieee80211_recalc_ps(local, -1);
763 ieee80211_recalc_smps(local, sdata);
764 mutex_unlock(&local->iflist_mtx);
765
766 netif_tx_start_all_queues(sdata->dev);
767 netif_carrier_on(sdata->dev);
768}
769
770static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata)
771{
772 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
773 struct ieee80211_local *local = sdata->local;
774 struct sta_info *sta;
775 u32 changed = 0, config_changed = 0;
776 u8 bssid[ETH_ALEN];
777
778 ASSERT_MGD_MTX(ifmgd);
779
780 if (WARN_ON(!ifmgd->associated))
781 return;
782
783 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
784
785 ifmgd->associated = NULL;
786 memset(ifmgd->bssid, 0, ETH_ALEN);
787
788 /*
789 * we need to commit the associated = NULL change because the
790 * scan code uses that to determine whether this iface should
791 * go to/wake up from powersave or not -- and could otherwise
792 * wake the queues erroneously.
793 */
794 smp_mb();
795
796 /*
797 * Thus, we can only afterwards stop the queues -- to account
798 * for the case where another CPU is finishing a scan at this
799 * time -- we don't want the scan code to enable queues.
800 */
801
802 netif_tx_stop_all_queues(sdata->dev);
803 netif_carrier_off(sdata->dev);
804
805 rcu_read_lock();
806 sta = sta_info_get(sdata, bssid);
807 if (sta) {
808 set_sta_flags(sta, WLAN_STA_DISASSOC);
809 ieee80211_sta_tear_down_BA_sessions(sta);
810 }
811 rcu_read_unlock();
812
813 changed |= ieee80211_reset_erp_info(sdata);
814
815 ieee80211_led_assoc(local, 0);
816 changed |= BSS_CHANGED_ASSOC;
817 sdata->vif.bss_conf.assoc = false;
818
819 ieee80211_set_wmm_default(sdata);
820
821 /* channel(_type) changes are handled by ieee80211_hw_config */
822 local->oper_channel_type = NL80211_CHAN_NO_HT;
823
824 /* on the next assoc, re-program HT parameters */
825 sdata->ht_opmode_valid = false;
826
827 local->power_constr_level = 0;
828
829 del_timer_sync(&local->dynamic_ps_timer);
830 cancel_work_sync(&local->dynamic_ps_enable_work);
831
832 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
833 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
834 config_changed |= IEEE80211_CONF_CHANGE_PS;
835 }
836
837 ieee80211_hw_config(local, config_changed);
838
839 /* And the BSSID changed -- not very interesting here */
840 changed |= BSS_CHANGED_BSSID;
841 ieee80211_bss_info_change_notify(sdata, changed);
842
843 sta_info_destroy_addr(sdata, bssid);
844}
845
846void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
847 struct ieee80211_hdr *hdr)
848{
849 /*
850 * We can postpone the mgd.timer whenever receiving unicast frames
851 * from AP because we know that the connection is working both ways
852 * at that time. But multicast frames (and hence also beacons) must
853 * be ignored here, because we need to trigger the timer during
854 * data idle periods for sending the periodic probe request to the
855 * AP we're connected to.
856 */
857 if (is_multicast_ether_addr(hdr->addr1))
858 return;
859
860 mod_timer(&sdata->u.mgd.conn_mon_timer,
861 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
862}
863
864static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
865{
866 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
867 const u8 *ssid;
868
869 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
870 ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
871 ssid + 2, ssid[1], NULL, 0);
872
873 ifmgd->probe_send_count++;
874 ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
875 run_again(ifmgd, ifmgd->probe_timeout);
876}
877
878static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
879 bool beacon)
880{
881 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
882 bool already = false;
883
884 if (!ieee80211_sdata_running(sdata))
885 return;
886
887 if (sdata->local->scanning)
888 return;
889
890 if (sdata->local->tmp_channel)
891 return;
892
893 mutex_lock(&ifmgd->mtx);
894
895 if (!ifmgd->associated)
896 goto out;
897
898#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
899 if (beacon && net_ratelimit())
900 printk(KERN_DEBUG "%s: detected beacon loss from AP "
901 "- sending probe request\n", sdata->name);
902#endif
903
904 /*
905 * The driver/our work has already reported this event or the
906 * connection monitoring has kicked in and we have already sent
907 * a probe request. Or maybe the AP died and the driver keeps
908 * reporting until we disassociate...
909 *
910 * In either case we have to ignore the current call to this
911 * function (except for setting the correct probe reason bit)
912 * because otherwise we would reset the timer every time and
913 * never check whether we received a probe response!
914 */
915 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
916 IEEE80211_STA_CONNECTION_POLL))
917 already = true;
918
919 if (beacon)
920 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
921 else
922 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
923
924 if (already)
925 goto out;
926
927 mutex_lock(&sdata->local->iflist_mtx);
928 ieee80211_recalc_ps(sdata->local, -1);
929 mutex_unlock(&sdata->local->iflist_mtx);
930
931 ifmgd->probe_send_count = 0;
932 ieee80211_mgd_probe_ap_send(sdata);
933 out:
934 mutex_unlock(&ifmgd->mtx);
935}
936
937void ieee80211_beacon_loss_work(struct work_struct *work)
938{
939 struct ieee80211_sub_if_data *sdata =
940 container_of(work, struct ieee80211_sub_if_data,
941 u.mgd.beacon_loss_work);
942
943 ieee80211_mgd_probe_ap(sdata, true);
944}
945
946void ieee80211_beacon_loss(struct ieee80211_vif *vif)
947{
948 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
949
950 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
951}
952EXPORT_SYMBOL(ieee80211_beacon_loss);
953
954static enum rx_mgmt_action __must_check
955ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
956 struct ieee80211_mgmt *mgmt, size_t len)
957{
958 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
959 const u8 *bssid = NULL;
960 u16 reason_code;
961
962 if (len < 24 + 2)
963 return RX_MGMT_NONE;
964
965 ASSERT_MGD_MTX(ifmgd);
966
967 bssid = ifmgd->associated->bssid;
968
969 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
970
971 printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
972 sdata->name, bssid, reason_code);
973
974 ieee80211_set_disassoc(sdata);
975 ieee80211_recalc_idle(sdata->local);
976
977 return RX_MGMT_CFG80211_DEAUTH;
978}
979
980
981static enum rx_mgmt_action __must_check
982ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
983 struct ieee80211_mgmt *mgmt, size_t len)
984{
985 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
986 u16 reason_code;
987
988 if (len < 24 + 2)
989 return RX_MGMT_NONE;
990
991 ASSERT_MGD_MTX(ifmgd);
992
993 if (WARN_ON(!ifmgd->associated))
994 return RX_MGMT_NONE;
995
996 if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
997 return RX_MGMT_NONE;
998
999 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1000
1001 printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1002 sdata->name, mgmt->sa, reason_code);
1003
1004 ieee80211_set_disassoc(sdata);
1005 ieee80211_recalc_idle(sdata->local);
1006 return RX_MGMT_CFG80211_DISASSOC;
1007}
1008
1009
1010static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1011 struct ieee80211_mgmt *mgmt, size_t len)
1012{
1013 struct ieee80211_sub_if_data *sdata = wk->sdata;
1014 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1015 struct ieee80211_local *local = sdata->local;
1016 struct ieee80211_supported_band *sband;
1017 struct sta_info *sta;
1018 struct cfg80211_bss *cbss = wk->assoc.bss;
1019 u8 *pos;
1020 u32 rates, basic_rates;
1021 u16 capab_info, aid;
1022 struct ieee802_11_elems elems;
1023 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1024 u32 changed = 0;
1025 int i, j, err;
1026 bool have_higher_than_11mbit = false;
1027 u16 ap_ht_cap_flags;
1028
1029 /* AssocResp and ReassocResp have identical structure */
1030
1031 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1032 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1033
1034 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1035 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1036 "set\n", sdata->name, aid);
1037 aid &= ~(BIT(15) | BIT(14));
1038
1039 pos = mgmt->u.assoc_resp.variable;
1040 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1041
1042 if (!elems.supp_rates) {
1043 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1044 sdata->name);
1045 return false;
1046 }
1047
1048 ifmgd->aid = aid;
1049
1050 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1051 if (!sta) {
1052 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1053 " the AP\n", sdata->name);
1054 return false;
1055 }
1056
1057 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1058 WLAN_STA_ASSOC_AP);
1059 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1060 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1061
1062 rates = 0;
1063 basic_rates = 0;
1064 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1065
1066 for (i = 0; i < elems.supp_rates_len; i++) {
1067 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1068 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1069
1070 if (rate > 110)
1071 have_higher_than_11mbit = true;
1072
1073 for (j = 0; j < sband->n_bitrates; j++) {
1074 if (sband->bitrates[j].bitrate == rate) {
1075 rates |= BIT(j);
1076 if (is_basic)
1077 basic_rates |= BIT(j);
1078 break;
1079 }
1080 }
1081 }
1082
1083 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1084 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1085 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1086
1087 if (rate > 110)
1088 have_higher_than_11mbit = true;
1089
1090 for (j = 0; j < sband->n_bitrates; j++) {
1091 if (sband->bitrates[j].bitrate == rate) {
1092 rates |= BIT(j);
1093 if (is_basic)
1094 basic_rates |= BIT(j);
1095 break;
1096 }
1097 }
1098 }
1099
1100 sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1101 sdata->vif.bss_conf.basic_rates = basic_rates;
1102
1103 /* cf. IEEE 802.11 9.2.12 */
1104 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1105 have_higher_than_11mbit)
1106 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1107 else
1108 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1109
1110 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1111 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1112 elems.ht_cap_elem, &sta->sta.ht_cap);
1113
1114 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1115
1116 rate_control_rate_init(sta);
1117
1118 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1119 set_sta_flags(sta, WLAN_STA_MFP);
1120
1121 if (elems.wmm_param)
1122 set_sta_flags(sta, WLAN_STA_WME);
1123
1124 err = sta_info_insert(sta);
1125 sta = NULL;
1126 if (err) {
1127 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1128 " the AP (error %d)\n", sdata->name, err);
1129 return false;
1130 }
1131
1132 if (elems.wmm_param)
1133 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1134 elems.wmm_param_len);
1135 else
1136 ieee80211_set_wmm_default(sdata);
1137
1138 local->oper_channel = wk->chan;
1139
1140 if (elems.ht_info_elem && elems.wmm_param &&
1141 (sdata->local->hw.queues >= 4) &&
1142 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1143 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1144 cbss->bssid, ap_ht_cap_flags);
1145
1146 /* set AID and assoc capability,
1147 * ieee80211_set_associated() will tell the driver */
1148 bss_conf->aid = aid;
1149 bss_conf->assoc_capability = capab_info;
1150 ieee80211_set_associated(sdata, cbss, changed);
1151
1152 /*
1153 * If we're using 4-addr mode, let the AP know that we're
1154 * doing so, so that it can create the STA VLAN on its side
1155 */
1156 if (ifmgd->use_4addr)
1157 ieee80211_send_4addr_nullfunc(local, sdata);
1158
1159 /*
1160 * Start timer to probe the connection to the AP now.
1161 * Also start the timer that will detect beacon loss.
1162 */
1163 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1164 mod_beacon_timer(sdata);
1165
1166 return true;
1167}
1168
1169
1170static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1171 struct ieee80211_mgmt *mgmt,
1172 size_t len,
1173 struct ieee80211_rx_status *rx_status,
1174 struct ieee802_11_elems *elems,
1175 bool beacon)
1176{
1177 struct ieee80211_local *local = sdata->local;
1178 int freq;
1179 struct ieee80211_bss *bss;
1180 struct ieee80211_channel *channel;
1181 bool need_ps = false;
1182
1183 if (sdata->u.mgd.associated) {
1184 bss = (void *)sdata->u.mgd.associated->priv;
1185 /* not previously set so we may need to recalc */
1186 need_ps = !bss->dtim_period;
1187 }
1188
1189 if (elems->ds_params && elems->ds_params_len == 1)
1190 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1191 else
1192 freq = rx_status->freq;
1193
1194 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1195
1196 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1197 return;
1198
1199 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1200 channel, beacon);
1201 if (bss)
1202 ieee80211_rx_bss_put(local, bss);
1203
1204 if (!sdata->u.mgd.associated)
1205 return;
1206
1207 if (need_ps) {
1208 mutex_lock(&local->iflist_mtx);
1209 ieee80211_recalc_ps(local, -1);
1210 mutex_unlock(&local->iflist_mtx);
1211 }
1212
1213 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1214 (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1215 ETH_ALEN) == 0)) {
1216 struct ieee80211_channel_sw_ie *sw_elem =
1217 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1218 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1219 }
1220}
1221
1222
1223static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1224 struct sk_buff *skb)
1225{
1226 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1227 struct ieee80211_if_managed *ifmgd;
1228 struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1229 size_t baselen, len = skb->len;
1230 struct ieee802_11_elems elems;
1231
1232 ifmgd = &sdata->u.mgd;
1233
1234 ASSERT_MGD_MTX(ifmgd);
1235
1236 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1237 return; /* ignore ProbeResp to foreign address */
1238
1239 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1240 if (baselen > len)
1241 return;
1242
1243 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1244 &elems);
1245
1246 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1247
1248 if (ifmgd->associated &&
1249 memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1250 ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1251 IEEE80211_STA_CONNECTION_POLL)) {
1252 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1253 IEEE80211_STA_BEACON_POLL);
1254 mutex_lock(&sdata->local->iflist_mtx);
1255 ieee80211_recalc_ps(sdata->local, -1);
1256 mutex_unlock(&sdata->local->iflist_mtx);
1257 /*
1258 * We've received a probe response, but are not sure whether
1259 * we have or will be receiving any beacons or data, so let's
1260 * schedule the timers again, just in case.
1261 */
1262 mod_beacon_timer(sdata);
1263 mod_timer(&ifmgd->conn_mon_timer,
1264 round_jiffies_up(jiffies +
1265 IEEE80211_CONNECTION_IDLE_TIME));
1266 }
1267}
1268
1269/*
1270 * This is the canonical list of information elements we care about,
1271 * the filter code also gives us all changes to the Microsoft OUI
1272 * (00:50:F2) vendor IE which is used for WMM which we need to track.
1273 *
1274 * We implement beacon filtering in software since that means we can
1275 * avoid processing the frame here and in cfg80211, and userspace
1276 * will not be able to tell whether the hardware supports it or not.
1277 *
1278 * XXX: This list needs to be dynamic -- userspace needs to be able to
1279 * add items it requires. It also needs to be able to tell us to
1280 * look out for other vendor IEs.
1281 */
1282static const u64 care_about_ies =
1283 (1ULL << WLAN_EID_COUNTRY) |
1284 (1ULL << WLAN_EID_ERP_INFO) |
1285 (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1286 (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1287 (1ULL << WLAN_EID_HT_CAPABILITY) |
1288 (1ULL << WLAN_EID_HT_INFORMATION);
1289
1290static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1291 struct ieee80211_mgmt *mgmt,
1292 size_t len,
1293 struct ieee80211_rx_status *rx_status)
1294{
1295 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1296 size_t baselen;
1297 struct ieee802_11_elems elems;
1298 struct ieee80211_local *local = sdata->local;
1299 u32 changed = 0;
1300 bool erp_valid, directed_tim = false;
1301 u8 erp_value = 0;
1302 u32 ncrc;
1303 u8 *bssid;
1304
1305 ASSERT_MGD_MTX(ifmgd);
1306
1307 /* Process beacon from the current BSS */
1308 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1309 if (baselen > len)
1310 return;
1311
1312 if (rx_status->freq != local->hw.conf.channel->center_freq)
1313 return;
1314
1315 /*
1316 * We might have received a number of frames, among them a
1317 * disassoc frame and a beacon...
1318 */
1319 if (!ifmgd->associated)
1320 return;
1321
1322 bssid = ifmgd->associated->bssid;
1323
1324 /*
1325 * And in theory even frames from a different AP we were just
1326 * associated to a split-second ago!
1327 */
1328 if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1329 return;
1330
1331 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1332#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1333 if (net_ratelimit()) {
1334 printk(KERN_DEBUG "%s: cancelling probereq poll due "
1335 "to a received beacon\n", sdata->name);
1336 }
1337#endif
1338 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1339 mutex_lock(&local->iflist_mtx);
1340 ieee80211_recalc_ps(local, -1);
1341 mutex_unlock(&local->iflist_mtx);
1342 }
1343
1344 /*
1345 * Push the beacon loss detection into the future since
1346 * we are processing a beacon from the AP just now.
1347 */
1348 mod_beacon_timer(sdata);
1349
1350 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1351 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1352 len - baselen, &elems,
1353 care_about_ies, ncrc);
1354
1355 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1356 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1357 ifmgd->aid);
1358
1359 if (ncrc != ifmgd->beacon_crc) {
1360 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1361 true);
1362
1363 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1364 elems.wmm_param_len);
1365 }
1366
1367 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1368 if (directed_tim) {
1369 if (local->hw.conf.dynamic_ps_timeout > 0) {
1370 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1371 ieee80211_hw_config(local,
1372 IEEE80211_CONF_CHANGE_PS);
1373 ieee80211_send_nullfunc(local, sdata, 0);
1374 } else {
1375 local->pspolling = true;
1376
1377 /*
1378 * Here is assumed that the driver will be
1379 * able to send ps-poll frame and receive a
1380 * response even though power save mode is
1381 * enabled, but some drivers might require
1382 * to disable power save here. This needs
1383 * to be investigated.
1384 */
1385 ieee80211_send_pspoll(local, sdata);
1386 }
1387 }
1388 }
1389
1390 if (ncrc == ifmgd->beacon_crc)
1391 return;
1392 ifmgd->beacon_crc = ncrc;
1393
1394 if (elems.erp_info && elems.erp_info_len >= 1) {
1395 erp_valid = true;
1396 erp_value = elems.erp_info[0];
1397 } else {
1398 erp_valid = false;
1399 }
1400 changed |= ieee80211_handle_bss_capability(sdata,
1401 le16_to_cpu(mgmt->u.beacon.capab_info),
1402 erp_valid, erp_value);
1403
1404
1405 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1406 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1407 struct sta_info *sta;
1408 struct ieee80211_supported_band *sband;
1409 u16 ap_ht_cap_flags;
1410
1411 rcu_read_lock();
1412
1413 sta = sta_info_get(sdata, bssid);
1414 if (WARN_ON(!sta)) {
1415 rcu_read_unlock();
1416 return;
1417 }
1418
1419 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1420
1421 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1422 elems.ht_cap_elem, &sta->sta.ht_cap);
1423
1424 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1425
1426 rcu_read_unlock();
1427
1428 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1429 bssid, ap_ht_cap_flags);
1430 }
1431
1432 /* Note: country IE parsing is done for us by cfg80211 */
1433 if (elems.country_elem) {
1434 /* TODO: IBSS also needs this */
1435 if (elems.pwr_constr_elem)
1436 ieee80211_handle_pwr_constr(sdata,
1437 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1438 elems.pwr_constr_elem,
1439 elems.pwr_constr_elem_len);
1440 }
1441
1442 ieee80211_bss_info_change_notify(sdata, changed);
1443}
1444
1445ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1446 struct sk_buff *skb)
1447{
1448 struct ieee80211_local *local = sdata->local;
1449 struct ieee80211_mgmt *mgmt;
1450 u16 fc;
1451
1452 if (skb->len < 24)
1453 return RX_DROP_MONITOR;
1454
1455 mgmt = (struct ieee80211_mgmt *) skb->data;
1456 fc = le16_to_cpu(mgmt->frame_control);
1457
1458 switch (fc & IEEE80211_FCTL_STYPE) {
1459 case IEEE80211_STYPE_PROBE_RESP:
1460 case IEEE80211_STYPE_BEACON:
1461 case IEEE80211_STYPE_DEAUTH:
1462 case IEEE80211_STYPE_DISASSOC:
1463 case IEEE80211_STYPE_ACTION:
1464 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1465 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
1466 return RX_QUEUED;
1467 }
1468
1469 return RX_DROP_MONITOR;
1470}
1471
1472static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1473 struct sk_buff *skb)
1474{
1475 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1476 struct ieee80211_rx_status *rx_status;
1477 struct ieee80211_mgmt *mgmt;
1478 enum rx_mgmt_action rma = RX_MGMT_NONE;
1479 u16 fc;
1480
1481 rx_status = (struct ieee80211_rx_status *) skb->cb;
1482 mgmt = (struct ieee80211_mgmt *) skb->data;
1483 fc = le16_to_cpu(mgmt->frame_control);
1484
1485 mutex_lock(&ifmgd->mtx);
1486
1487 if (ifmgd->associated &&
1488 memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1489 switch (fc & IEEE80211_FCTL_STYPE) {
1490 case IEEE80211_STYPE_BEACON:
1491 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1492 rx_status);
1493 break;
1494 case IEEE80211_STYPE_PROBE_RESP:
1495 ieee80211_rx_mgmt_probe_resp(sdata, skb);
1496 break;
1497 case IEEE80211_STYPE_DEAUTH:
1498 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1499 break;
1500 case IEEE80211_STYPE_DISASSOC:
1501 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1502 break;
1503 case IEEE80211_STYPE_ACTION:
1504 if (mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
1505 break;
1506
1507 ieee80211_sta_process_chanswitch(sdata,
1508 &mgmt->u.action.u.chan_switch.sw_elem,
1509 (void *)ifmgd->associated->priv);
1510 break;
1511 }
1512 mutex_unlock(&ifmgd->mtx);
1513
1514 switch (rma) {
1515 case RX_MGMT_NONE:
1516 /* no action */
1517 break;
1518 case RX_MGMT_CFG80211_DEAUTH:
1519 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1520 break;
1521 case RX_MGMT_CFG80211_DISASSOC:
1522 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1523 break;
1524 default:
1525 WARN(1, "unexpected: %d", rma);
1526 }
1527 goto out;
1528 }
1529
1530 mutex_unlock(&ifmgd->mtx);
1531
1532 if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1533 (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH)
1534 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1535
1536 out:
1537 kfree_skb(skb);
1538}
1539
1540static void ieee80211_sta_timer(unsigned long data)
1541{
1542 struct ieee80211_sub_if_data *sdata =
1543 (struct ieee80211_sub_if_data *) data;
1544 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1545 struct ieee80211_local *local = sdata->local;
1546
1547 if (local->quiescing) {
1548 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1549 return;
1550 }
1551
1552 ieee80211_queue_work(&local->hw, &ifmgd->work);
1553}
1554
1555static void ieee80211_sta_work(struct work_struct *work)
1556{
1557 struct ieee80211_sub_if_data *sdata =
1558 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1559 struct ieee80211_local *local = sdata->local;
1560 struct ieee80211_if_managed *ifmgd;
1561 struct sk_buff *skb;
1562
1563 if (!ieee80211_sdata_running(sdata))
1564 return;
1565
1566 if (local->scanning)
1567 return;
1568
1569 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1570 return;
1571
1572 /*
1573 * ieee80211_queue_work() should have picked up most cases,
1574 * here we'll pick the the rest.
1575 */
1576 if (WARN(local->suspended, "STA MLME work scheduled while "
1577 "going to suspend\n"))
1578 return;
1579
1580 ifmgd = &sdata->u.mgd;
1581
1582 /* first process frames to avoid timing out while a frame is pending */
1583 while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1584 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1585
1586 /* then process the rest of the work */
1587 mutex_lock(&ifmgd->mtx);
1588
1589 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1590 IEEE80211_STA_CONNECTION_POLL) &&
1591 ifmgd->associated) {
1592 u8 bssid[ETH_ALEN];
1593
1594 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1595 if (time_is_after_jiffies(ifmgd->probe_timeout))
1596 run_again(ifmgd, ifmgd->probe_timeout);
1597
1598 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1599#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1600 printk(KERN_DEBUG "No probe response from AP %pM"
1601 " after %dms, try %d\n", bssid,
1602 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1603 ifmgd->probe_send_count);
1604#endif
1605 ieee80211_mgd_probe_ap_send(sdata);
1606 } else {
1607 /*
1608 * We actually lost the connection ... or did we?
1609 * Let's make sure!
1610 */
1611 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1612 IEEE80211_STA_BEACON_POLL);
1613 printk(KERN_DEBUG "No probe response from AP %pM"
1614 " after %dms, disconnecting.\n",
1615 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1616 ieee80211_set_disassoc(sdata);
1617 ieee80211_recalc_idle(local);
1618 mutex_unlock(&ifmgd->mtx);
1619 /*
1620 * must be outside lock due to cfg80211,
1621 * but that's not a problem.
1622 */
1623 ieee80211_send_deauth_disassoc(sdata, bssid,
1624 IEEE80211_STYPE_DEAUTH,
1625 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1626 NULL);
1627 mutex_lock(&ifmgd->mtx);
1628 }
1629 }
1630
1631 mutex_unlock(&ifmgd->mtx);
1632}
1633
1634static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1635{
1636 struct ieee80211_sub_if_data *sdata =
1637 (struct ieee80211_sub_if_data *) data;
1638 struct ieee80211_local *local = sdata->local;
1639
1640 if (local->quiescing)
1641 return;
1642
1643 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
1644}
1645
1646static void ieee80211_sta_conn_mon_timer(unsigned long data)
1647{
1648 struct ieee80211_sub_if_data *sdata =
1649 (struct ieee80211_sub_if_data *) data;
1650 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1651 struct ieee80211_local *local = sdata->local;
1652
1653 if (local->quiescing)
1654 return;
1655
1656 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1657}
1658
1659static void ieee80211_sta_monitor_work(struct work_struct *work)
1660{
1661 struct ieee80211_sub_if_data *sdata =
1662 container_of(work, struct ieee80211_sub_if_data,
1663 u.mgd.monitor_work);
1664
1665 ieee80211_mgd_probe_ap(sdata, false);
1666}
1667
1668static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1669{
1670 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1671 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1672 IEEE80211_STA_CONNECTION_POLL);
1673
1674 /* let's probe the connection once */
1675 ieee80211_queue_work(&sdata->local->hw,
1676 &sdata->u.mgd.monitor_work);
1677 /* and do all the other regular work too */
1678 ieee80211_queue_work(&sdata->local->hw,
1679 &sdata->u.mgd.work);
1680 }
1681}
1682
1683#ifdef CONFIG_PM
1684void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1685{
1686 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1687
1688 /*
1689 * we need to use atomic bitops for the running bits
1690 * only because both timers might fire at the same
1691 * time -- the code here is properly synchronised.
1692 */
1693
1694 cancel_work_sync(&ifmgd->work);
1695 cancel_work_sync(&ifmgd->beacon_loss_work);
1696 if (del_timer_sync(&ifmgd->timer))
1697 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1698
1699 cancel_work_sync(&ifmgd->chswitch_work);
1700 if (del_timer_sync(&ifmgd->chswitch_timer))
1701 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1702
1703 cancel_work_sync(&ifmgd->monitor_work);
1704 /* these will just be re-established on connection */
1705 del_timer_sync(&ifmgd->conn_mon_timer);
1706 del_timer_sync(&ifmgd->bcn_mon_timer);
1707}
1708
1709void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1710{
1711 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1712
1713 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1714 add_timer(&ifmgd->timer);
1715 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1716 add_timer(&ifmgd->chswitch_timer);
1717}
1718#endif
1719
1720/* interface setup */
1721void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1722{
1723 struct ieee80211_if_managed *ifmgd;
1724
1725 ifmgd = &sdata->u.mgd;
1726 INIT_WORK(&ifmgd->work, ieee80211_sta_work);
1727 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1728 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1729 INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
1730 setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1731 (unsigned long) sdata);
1732 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1733 (unsigned long) sdata);
1734 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1735 (unsigned long) sdata);
1736 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1737 (unsigned long) sdata);
1738 skb_queue_head_init(&ifmgd->skb_queue);
1739
1740 ifmgd->flags = 0;
1741
1742 mutex_init(&ifmgd->mtx);
1743
1744 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1745 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1746 else
1747 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1748}
1749
1750/* scan finished notification */
1751void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1752{
1753 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1754
1755 /* Restart STA timers */
1756 rcu_read_lock();
1757 list_for_each_entry_rcu(sdata, &local->interfaces, list)
1758 ieee80211_restart_sta_timer(sdata);
1759 rcu_read_unlock();
1760}
1761
1762int ieee80211_max_network_latency(struct notifier_block *nb,
1763 unsigned long data, void *dummy)
1764{
1765 s32 latency_usec = (s32) data;
1766 struct ieee80211_local *local =
1767 container_of(nb, struct ieee80211_local,
1768 network_latency_notifier);
1769
1770 mutex_lock(&local->iflist_mtx);
1771 ieee80211_recalc_ps(local, latency_usec);
1772 mutex_unlock(&local->iflist_mtx);
1773
1774 return 0;
1775}
1776
1777/* config hooks */
1778static enum work_done_result
1779ieee80211_probe_auth_done(struct ieee80211_work *wk,
1780 struct sk_buff *skb)
1781{
1782 if (!skb) {
1783 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
1784 return WORK_DONE_DESTROY;
1785 }
1786
1787 if (wk->type == IEEE80211_WORK_AUTH) {
1788 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
1789 return WORK_DONE_DESTROY;
1790 }
1791
1792 mutex_lock(&wk->sdata->u.mgd.mtx);
1793 ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
1794 mutex_unlock(&wk->sdata->u.mgd.mtx);
1795
1796 wk->type = IEEE80211_WORK_AUTH;
1797 wk->probe_auth.tries = 0;
1798 return WORK_DONE_REQUEUE;
1799}
1800
1801int ieee80211_mgd_auth(struct ieee80211_sub…Large files files are truncated, but you can click here to view the full file