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mac80211: proper bss private data handling
[mirror_ubuntu-bionic-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 <net/mac80211.h>
23 #include <asm/unaligned.h>
24
25 #include "ieee80211_i.h"
26 #include "driver-ops.h"
27 #include "rate.h"
28 #include "led.h"
29
30 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
31 #define IEEE80211_AUTH_MAX_TRIES 3
32 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
33 #define IEEE80211_ASSOC_MAX_TRIES 3
34 #define IEEE80211_MAX_PROBE_TRIES 5
35
36 /*
37 * beacon loss detection timeout
38 * XXX: should depend on beacon interval
39 */
40 #define IEEE80211_BEACON_LOSS_TIME (2 * HZ)
41 /*
42 * Time the connection can be idle before we probe
43 * it to see if we can still talk to the AP.
44 */
45 #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ)
46 /*
47 * Time we wait for a probe response after sending
48 * a probe request because of beacon loss or for
49 * checking the connection still works.
50 */
51 #define IEEE80211_PROBE_WAIT (HZ / 2)
52
53 #define TMR_RUNNING_TIMER 0
54 #define TMR_RUNNING_CHANSW 1
55
56 /*
57 * All cfg80211 functions have to be called outside a locked
58 * section so that they can acquire a lock themselves... This
59 * is much simpler than queuing up things in cfg80211, but we
60 * do need some indirection for that here.
61 */
62 enum rx_mgmt_action {
63 /* no action required */
64 RX_MGMT_NONE,
65
66 /* caller must call cfg80211_send_rx_auth() */
67 RX_MGMT_CFG80211_AUTH,
68
69 /* caller must call cfg80211_send_rx_assoc() */
70 RX_MGMT_CFG80211_ASSOC,
71
72 /* caller must call cfg80211_send_deauth() */
73 RX_MGMT_CFG80211_DEAUTH,
74
75 /* caller must call cfg80211_send_disassoc() */
76 RX_MGMT_CFG80211_DISASSOC,
77
78 /* caller must tell cfg80211 about internal error */
79 RX_MGMT_CFG80211_ASSOC_ERROR,
80 };
81
82 /* utils */
83 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
84 {
85 WARN_ON(!mutex_is_locked(&ifmgd->mtx));
86 }
87
88 /*
89 * We can have multiple work items (and connection probing)
90 * scheduling this timer, but we need to take care to only
91 * reschedule it when it should fire _earlier_ than it was
92 * asked for before, or if it's not pending right now. This
93 * function ensures that. Note that it then is required to
94 * run this function for all timeouts after the first one
95 * has happened -- the work that runs from this timer will
96 * do that.
97 */
98 static void run_again(struct ieee80211_if_managed *ifmgd,
99 unsigned long timeout)
100 {
101 ASSERT_MGD_MTX(ifmgd);
102
103 if (!timer_pending(&ifmgd->timer) ||
104 time_before(timeout, ifmgd->timer.expires))
105 mod_timer(&ifmgd->timer, timeout);
106 }
107
108 static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata)
109 {
110 if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
111 return;
112
113 mod_timer(&sdata->u.mgd.bcn_mon_timer,
114 round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME));
115 }
116
117 static int ecw2cw(int ecw)
118 {
119 return (1 << ecw) - 1;
120 }
121
122 /*
123 * ieee80211_enable_ht should be called only after the operating band
124 * has been determined as ht configuration depends on the hw's
125 * HT abilities for a specific band.
126 */
127 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
128 struct ieee80211_ht_info *hti,
129 const u8 *bssid, u16 ap_ht_cap_flags)
130 {
131 struct ieee80211_local *local = sdata->local;
132 struct ieee80211_supported_band *sband;
133 struct sta_info *sta;
134 u32 changed = 0;
135 u16 ht_opmode;
136 bool enable_ht = true, ht_changed;
137 enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
138
139 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
140
141 /* HT is not supported */
142 if (!sband->ht_cap.ht_supported)
143 enable_ht = false;
144
145 /* check that channel matches the right operating channel */
146 if (local->hw.conf.channel->center_freq !=
147 ieee80211_channel_to_frequency(hti->control_chan))
148 enable_ht = false;
149
150 if (enable_ht) {
151 channel_type = NL80211_CHAN_HT20;
152
153 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
154 (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
155 (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
156 switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
157 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
158 if (!(local->hw.conf.channel->flags &
159 IEEE80211_CHAN_NO_HT40PLUS))
160 channel_type = NL80211_CHAN_HT40PLUS;
161 break;
162 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
163 if (!(local->hw.conf.channel->flags &
164 IEEE80211_CHAN_NO_HT40MINUS))
165 channel_type = NL80211_CHAN_HT40MINUS;
166 break;
167 }
168 }
169 }
170
171 ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
172 channel_type != local->hw.conf.channel_type;
173
174 local->oper_channel_type = channel_type;
175
176 if (ht_changed) {
177 /* channel_type change automatically detected */
178 ieee80211_hw_config(local, 0);
179
180 rcu_read_lock();
181 sta = sta_info_get(sdata, bssid);
182 if (sta)
183 rate_control_rate_update(local, sband, sta,
184 IEEE80211_RC_HT_CHANGED);
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
207 static 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
249 void ieee80211_send_pspoll(struct ieee80211_local *local,
250 struct ieee80211_sub_if_data *sdata)
251 {
252 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
253 struct ieee80211_pspoll *pspoll;
254 struct sk_buff *skb;
255 u16 fc;
256
257 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
258 if (!skb) {
259 printk(KERN_DEBUG "%s: failed to allocate buffer for "
260 "pspoll frame\n", sdata->name);
261 return;
262 }
263 skb_reserve(skb, local->hw.extra_tx_headroom);
264
265 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
266 memset(pspoll, 0, sizeof(*pspoll));
267 fc = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL | IEEE80211_FCTL_PM;
268 pspoll->frame_control = cpu_to_le16(fc);
269 pspoll->aid = cpu_to_le16(ifmgd->aid);
270
271 /* aid in PS-Poll has its two MSBs each set to 1 */
272 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
273
274 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
275 memcpy(pspoll->ta, sdata->vif.addr, ETH_ALEN);
276
277 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
278 ieee80211_tx_skb(sdata, skb);
279 }
280
281 void ieee80211_send_nullfunc(struct ieee80211_local *local,
282 struct ieee80211_sub_if_data *sdata,
283 int powersave)
284 {
285 struct sk_buff *skb;
286 struct ieee80211_hdr *nullfunc;
287 __le16 fc;
288
289 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
290 return;
291
292 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
293 if (!skb) {
294 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
295 "frame\n", sdata->name);
296 return;
297 }
298 skb_reserve(skb, local->hw.extra_tx_headroom);
299
300 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
301 memset(nullfunc, 0, 24);
302 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
303 IEEE80211_FCTL_TODS);
304 if (powersave)
305 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
306 nullfunc->frame_control = fc;
307 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
308 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
309 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, 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 conf->flags |= IEEE80211_CONF_PS;
440 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
441 }
442 }
443
444 static void ieee80211_change_ps(struct ieee80211_local *local)
445 {
446 struct ieee80211_conf *conf = &local->hw.conf;
447
448 if (local->ps_sdata) {
449 ieee80211_enable_ps(local, local->ps_sdata);
450 } else if (conf->flags & IEEE80211_CONF_PS) {
451 conf->flags &= ~IEEE80211_CONF_PS;
452 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
453 del_timer_sync(&local->dynamic_ps_timer);
454 cancel_work_sync(&local->dynamic_ps_enable_work);
455 }
456 }
457
458 /* need to hold RTNL or interface lock */
459 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
460 {
461 struct ieee80211_sub_if_data *sdata, *found = NULL;
462 int count = 0;
463
464 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
465 local->ps_sdata = NULL;
466 return;
467 }
468
469 if (!list_empty(&local->work_list)) {
470 local->ps_sdata = NULL;
471 goto change;
472 }
473
474 list_for_each_entry(sdata, &local->interfaces, list) {
475 if (!ieee80211_sdata_running(sdata))
476 continue;
477 if (sdata->vif.type != NL80211_IFTYPE_STATION)
478 continue;
479 found = sdata;
480 count++;
481 }
482
483 if (count == 1 && found->u.mgd.powersave &&
484 found->u.mgd.associated &&
485 !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
486 IEEE80211_STA_CONNECTION_POLL))) {
487 s32 beaconint_us;
488
489 if (latency < 0)
490 latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
491
492 beaconint_us = ieee80211_tu_to_usec(
493 found->vif.bss_conf.beacon_int);
494
495 if (beaconint_us > latency) {
496 local->ps_sdata = NULL;
497 } else {
498 u8 dtimper = found->vif.bss_conf.dtim_period;
499 int maxslp = 1;
500
501 if (dtimper > 1)
502 maxslp = min_t(int, dtimper,
503 latency / beaconint_us);
504
505 local->hw.conf.max_sleep_period = maxslp;
506 local->ps_sdata = found;
507 }
508 } else {
509 local->ps_sdata = NULL;
510 }
511
512 change:
513 ieee80211_change_ps(local);
514 }
515
516 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
517 {
518 struct ieee80211_local *local =
519 container_of(work, struct ieee80211_local,
520 dynamic_ps_disable_work);
521
522 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
523 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
524 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
525 }
526
527 ieee80211_wake_queues_by_reason(&local->hw,
528 IEEE80211_QUEUE_STOP_REASON_PS);
529 }
530
531 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
532 {
533 struct ieee80211_local *local =
534 container_of(work, struct ieee80211_local,
535 dynamic_ps_enable_work);
536 struct ieee80211_sub_if_data *sdata = local->ps_sdata;
537
538 /* can only happen when PS was just disabled anyway */
539 if (!sdata)
540 return;
541
542 if (local->hw.conf.flags & IEEE80211_CONF_PS)
543 return;
544
545 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
546 ieee80211_send_nullfunc(local, sdata, 1);
547
548 local->hw.conf.flags |= IEEE80211_CONF_PS;
549 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
550 }
551
552 void ieee80211_dynamic_ps_timer(unsigned long data)
553 {
554 struct ieee80211_local *local = (void *) data;
555
556 if (local->quiescing || local->suspended)
557 return;
558
559 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
560 }
561
562 /* MLME */
563 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
564 struct ieee80211_if_managed *ifmgd,
565 u8 *wmm_param, size_t wmm_param_len)
566 {
567 struct ieee80211_tx_queue_params params;
568 size_t left;
569 int count;
570 u8 *pos;
571
572 if (local->hw.queues < 4)
573 return;
574
575 if (!wmm_param)
576 return;
577
578 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
579 return;
580 count = wmm_param[6] & 0x0f;
581 if (count == ifmgd->wmm_last_param_set)
582 return;
583 ifmgd->wmm_last_param_set = count;
584
585 pos = wmm_param + 8;
586 left = wmm_param_len - 8;
587
588 memset(&params, 0, sizeof(params));
589
590 local->wmm_acm = 0;
591 for (; left >= 4; left -= 4, pos += 4) {
592 int aci = (pos[0] >> 5) & 0x03;
593 int acm = (pos[0] >> 4) & 0x01;
594 int queue;
595
596 switch (aci) {
597 case 1: /* AC_BK */
598 queue = 3;
599 if (acm)
600 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
601 break;
602 case 2: /* AC_VI */
603 queue = 1;
604 if (acm)
605 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
606 break;
607 case 3: /* AC_VO */
608 queue = 0;
609 if (acm)
610 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
611 break;
612 case 0: /* AC_BE */
613 default:
614 queue = 2;
615 if (acm)
616 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
617 break;
618 }
619
620 params.aifs = pos[0] & 0x0f;
621 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
622 params.cw_min = ecw2cw(pos[1] & 0x0f);
623 params.txop = get_unaligned_le16(pos + 2);
624 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
625 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
626 "cWmin=%d cWmax=%d txop=%d\n",
627 wiphy_name(local->hw.wiphy), queue, aci, acm,
628 params.aifs, params.cw_min, params.cw_max, params.txop);
629 #endif
630 if (drv_conf_tx(local, queue, &params) && local->ops->conf_tx)
631 printk(KERN_DEBUG "%s: failed to set TX queue "
632 "parameters for queue %d\n",
633 wiphy_name(local->hw.wiphy), queue);
634 }
635 }
636
637 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
638 u16 capab, bool erp_valid, u8 erp)
639 {
640 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
641 u32 changed = 0;
642 bool use_protection;
643 bool use_short_preamble;
644 bool use_short_slot;
645
646 if (erp_valid) {
647 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
648 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
649 } else {
650 use_protection = false;
651 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
652 }
653
654 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
655
656 if (use_protection != bss_conf->use_cts_prot) {
657 bss_conf->use_cts_prot = use_protection;
658 changed |= BSS_CHANGED_ERP_CTS_PROT;
659 }
660
661 if (use_short_preamble != bss_conf->use_short_preamble) {
662 bss_conf->use_short_preamble = use_short_preamble;
663 changed |= BSS_CHANGED_ERP_PREAMBLE;
664 }
665
666 if (use_short_slot != bss_conf->use_short_slot) {
667 bss_conf->use_short_slot = use_short_slot;
668 changed |= BSS_CHANGED_ERP_SLOT;
669 }
670
671 return changed;
672 }
673
674 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
675 struct cfg80211_bss *cbss,
676 u32 bss_info_changed)
677 {
678 struct ieee80211_bss *bss = (void *)cbss->priv;
679 struct ieee80211_local *local = sdata->local;
680
681 bss_info_changed |= BSS_CHANGED_ASSOC;
682 /* set timing information */
683 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
684 sdata->vif.bss_conf.timestamp = cbss->tsf;
685 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
686
687 bss_info_changed |= BSS_CHANGED_BEACON_INT;
688 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
689 cbss->capability, bss->has_erp_value, bss->erp_value);
690
691 sdata->u.mgd.associated = cbss;
692 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
693
694 /* just to be sure */
695 sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
696 IEEE80211_STA_BEACON_POLL);
697
698 /*
699 * Always handle WMM once after association regardless
700 * of the first value the AP uses. Setting -1 here has
701 * that effect because the AP values is an unsigned
702 * 4-bit value.
703 */
704 sdata->u.mgd.wmm_last_param_set = -1;
705
706 ieee80211_led_assoc(local, 1);
707
708 sdata->vif.bss_conf.assoc = 1;
709 /*
710 * For now just always ask the driver to update the basic rateset
711 * when we have associated, we aren't checking whether it actually
712 * changed or not.
713 */
714 bss_info_changed |= BSS_CHANGED_BASIC_RATES;
715
716 /* And the BSSID changed - we're associated now */
717 bss_info_changed |= BSS_CHANGED_BSSID;
718
719 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
720
721 mutex_lock(&local->iflist_mtx);
722 ieee80211_recalc_ps(local, -1);
723 ieee80211_recalc_smps(local, sdata);
724 mutex_unlock(&local->iflist_mtx);
725
726 netif_start_queue(sdata->dev);
727 netif_carrier_on(sdata->dev);
728 }
729
730 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata)
731 {
732 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
733 struct ieee80211_local *local = sdata->local;
734 struct sta_info *sta;
735 u32 changed = 0, config_changed = 0;
736 u8 bssid[ETH_ALEN];
737
738 ASSERT_MGD_MTX(ifmgd);
739
740 if (WARN_ON(!ifmgd->associated))
741 return;
742
743 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
744
745 ifmgd->associated = NULL;
746 memset(ifmgd->bssid, 0, ETH_ALEN);
747
748 /*
749 * we need to commit the associated = NULL change because the
750 * scan code uses that to determine whether this iface should
751 * go to/wake up from powersave or not -- and could otherwise
752 * wake the queues erroneously.
753 */
754 smp_mb();
755
756 /*
757 * Thus, we can only afterwards stop the queues -- to account
758 * for the case where another CPU is finishing a scan at this
759 * time -- we don't want the scan code to enable queues.
760 */
761
762 netif_stop_queue(sdata->dev);
763 netif_carrier_off(sdata->dev);
764
765 rcu_read_lock();
766 sta = sta_info_get(sdata, bssid);
767 if (sta)
768 ieee80211_sta_tear_down_BA_sessions(sta);
769 rcu_read_unlock();
770
771 changed |= ieee80211_reset_erp_info(sdata);
772
773 ieee80211_led_assoc(local, 0);
774 changed |= BSS_CHANGED_ASSOC;
775 sdata->vif.bss_conf.assoc = false;
776
777 ieee80211_set_wmm_default(sdata);
778
779 /* channel(_type) changes are handled by ieee80211_hw_config */
780 local->oper_channel_type = NL80211_CHAN_NO_HT;
781
782 /* on the next assoc, re-program HT parameters */
783 sdata->ht_opmode_valid = false;
784
785 local->power_constr_level = 0;
786
787 del_timer_sync(&local->dynamic_ps_timer);
788 cancel_work_sync(&local->dynamic_ps_enable_work);
789
790 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
791 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
792 config_changed |= IEEE80211_CONF_CHANGE_PS;
793 }
794
795 ieee80211_hw_config(local, config_changed);
796
797 /* And the BSSID changed -- not very interesting here */
798 changed |= BSS_CHANGED_BSSID;
799 ieee80211_bss_info_change_notify(sdata, changed);
800
801 rcu_read_lock();
802
803 sta = sta_info_get(sdata, bssid);
804 if (!sta) {
805 rcu_read_unlock();
806 return;
807 }
808
809 sta_info_unlink(&sta);
810
811 rcu_read_unlock();
812
813 sta_info_destroy(sta);
814 }
815
816 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
817 struct ieee80211_hdr *hdr)
818 {
819 /*
820 * We can postpone the mgd.timer whenever receiving unicast frames
821 * from AP because we know that the connection is working both ways
822 * at that time. But multicast frames (and hence also beacons) must
823 * be ignored here, because we need to trigger the timer during
824 * data idle periods for sending the periodic probe request to the
825 * AP we're connected to.
826 */
827 if (is_multicast_ether_addr(hdr->addr1))
828 return;
829
830 mod_timer(&sdata->u.mgd.conn_mon_timer,
831 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
832 }
833
834 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
835 {
836 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
837 const u8 *ssid;
838
839 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
840 ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
841 ssid + 2, ssid[1], NULL, 0);
842
843 ifmgd->probe_send_count++;
844 ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
845 run_again(ifmgd, ifmgd->probe_timeout);
846 }
847
848 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
849 bool beacon)
850 {
851 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
852 bool already = false;
853
854 if (!ieee80211_sdata_running(sdata))
855 return;
856
857 if (sdata->local->scanning)
858 return;
859
860 mutex_lock(&ifmgd->mtx);
861
862 if (!ifmgd->associated)
863 goto out;
864
865 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
866 if (beacon && net_ratelimit())
867 printk(KERN_DEBUG "%s: detected beacon loss from AP "
868 "- sending probe request\n", sdata->name);
869 #endif
870
871 /*
872 * The driver/our work has already reported this event or the
873 * connection monitoring has kicked in and we have already sent
874 * a probe request. Or maybe the AP died and the driver keeps
875 * reporting until we disassociate...
876 *
877 * In either case we have to ignore the current call to this
878 * function (except for setting the correct probe reason bit)
879 * because otherwise we would reset the timer every time and
880 * never check whether we received a probe response!
881 */
882 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
883 IEEE80211_STA_CONNECTION_POLL))
884 already = true;
885
886 if (beacon)
887 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
888 else
889 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
890
891 if (already)
892 goto out;
893
894 mutex_lock(&sdata->local->iflist_mtx);
895 ieee80211_recalc_ps(sdata->local, -1);
896 mutex_unlock(&sdata->local->iflist_mtx);
897
898 ifmgd->probe_send_count = 0;
899 ieee80211_mgd_probe_ap_send(sdata);
900 out:
901 mutex_unlock(&ifmgd->mtx);
902 }
903
904 void ieee80211_beacon_loss_work(struct work_struct *work)
905 {
906 struct ieee80211_sub_if_data *sdata =
907 container_of(work, struct ieee80211_sub_if_data,
908 u.mgd.beacon_loss_work);
909
910 ieee80211_mgd_probe_ap(sdata, true);
911 }
912
913 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
914 {
915 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
916
917 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
918 }
919 EXPORT_SYMBOL(ieee80211_beacon_loss);
920
921 static enum rx_mgmt_action __must_check
922 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
923 struct ieee80211_mgmt *mgmt, size_t len)
924 {
925 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
926 const u8 *bssid = NULL;
927 u16 reason_code;
928
929 if (len < 24 + 2)
930 return RX_MGMT_NONE;
931
932 ASSERT_MGD_MTX(ifmgd);
933
934 bssid = ifmgd->associated->bssid;
935
936 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
937
938 printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
939 sdata->name, bssid, reason_code);
940
941 ieee80211_set_disassoc(sdata);
942 ieee80211_recalc_idle(sdata->local);
943
944 return RX_MGMT_CFG80211_DEAUTH;
945 }
946
947
948 static enum rx_mgmt_action __must_check
949 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
950 struct ieee80211_mgmt *mgmt, size_t len)
951 {
952 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
953 u16 reason_code;
954
955 if (len < 24 + 2)
956 return RX_MGMT_NONE;
957
958 ASSERT_MGD_MTX(ifmgd);
959
960 if (WARN_ON(!ifmgd->associated))
961 return RX_MGMT_NONE;
962
963 if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
964 return RX_MGMT_NONE;
965
966 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
967
968 printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
969 sdata->name, mgmt->sa, reason_code);
970
971 ieee80211_set_disassoc(sdata);
972 ieee80211_recalc_idle(sdata->local);
973 return RX_MGMT_CFG80211_DISASSOC;
974 }
975
976
977 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
978 struct ieee80211_mgmt *mgmt, size_t len)
979 {
980 struct ieee80211_sub_if_data *sdata = wk->sdata;
981 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
982 struct ieee80211_local *local = sdata->local;
983 struct ieee80211_supported_band *sband;
984 struct sta_info *sta;
985 struct cfg80211_bss *cbss = wk->assoc.bss;
986 u8 *pos;
987 u32 rates, basic_rates;
988 u16 capab_info, aid;
989 struct ieee802_11_elems elems;
990 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
991 u32 changed = 0;
992 int i, j, err;
993 bool have_higher_than_11mbit = false;
994 u16 ap_ht_cap_flags;
995
996 /* AssocResp and ReassocResp have identical structure */
997
998 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
999 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1000
1001 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1002 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1003 "set\n", sdata->name, aid);
1004 aid &= ~(BIT(15) | BIT(14));
1005
1006 pos = mgmt->u.assoc_resp.variable;
1007 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1008
1009 if (!elems.supp_rates) {
1010 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1011 sdata->name);
1012 return false;
1013 }
1014
1015 ifmgd->aid = aid;
1016
1017 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1018 if (!sta) {
1019 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1020 " the AP\n", sdata->name);
1021 return false;
1022 }
1023
1024 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1025 WLAN_STA_ASSOC_AP);
1026 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1027 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1028
1029 rates = 0;
1030 basic_rates = 0;
1031 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1032
1033 for (i = 0; i < elems.supp_rates_len; i++) {
1034 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1035 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1036
1037 if (rate > 110)
1038 have_higher_than_11mbit = true;
1039
1040 for (j = 0; j < sband->n_bitrates; j++) {
1041 if (sband->bitrates[j].bitrate == rate) {
1042 rates |= BIT(j);
1043 if (is_basic)
1044 basic_rates |= BIT(j);
1045 break;
1046 }
1047 }
1048 }
1049
1050 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1051 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1052 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1053
1054 if (rate > 110)
1055 have_higher_than_11mbit = true;
1056
1057 for (j = 0; j < sband->n_bitrates; j++) {
1058 if (sband->bitrates[j].bitrate == rate) {
1059 rates |= BIT(j);
1060 if (is_basic)
1061 basic_rates |= BIT(j);
1062 break;
1063 }
1064 }
1065 }
1066
1067 sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1068 sdata->vif.bss_conf.basic_rates = basic_rates;
1069
1070 /* cf. IEEE 802.11 9.2.12 */
1071 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1072 have_higher_than_11mbit)
1073 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1074 else
1075 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1076
1077 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1078 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1079 elems.ht_cap_elem, &sta->sta.ht_cap);
1080
1081 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1082
1083 rate_control_rate_init(sta);
1084
1085 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1086 set_sta_flags(sta, WLAN_STA_MFP);
1087
1088 if (elems.wmm_param)
1089 set_sta_flags(sta, WLAN_STA_WME);
1090
1091 err = sta_info_insert(sta);
1092 sta = NULL;
1093 if (err) {
1094 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1095 " the AP (error %d)\n", sdata->name, err);
1096 return RX_MGMT_CFG80211_ASSOC_ERROR;
1097 }
1098
1099 if (elems.wmm_param)
1100 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1101 elems.wmm_param_len);
1102 else
1103 ieee80211_set_wmm_default(sdata);
1104
1105 if (elems.ht_info_elem && elems.wmm_param &&
1106 (sdata->local->hw.queues >= 4) &&
1107 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1108 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1109 cbss->bssid, ap_ht_cap_flags);
1110
1111 /* set AID and assoc capability,
1112 * ieee80211_set_associated() will tell the driver */
1113 bss_conf->aid = aid;
1114 bss_conf->assoc_capability = capab_info;
1115 ieee80211_set_associated(sdata, cbss, changed);
1116
1117 /*
1118 * Start timer to probe the connection to the AP now.
1119 * Also start the timer that will detect beacon loss.
1120 */
1121 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1122 mod_beacon_timer(sdata);
1123
1124 return true;
1125 }
1126
1127
1128 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1129 struct ieee80211_mgmt *mgmt,
1130 size_t len,
1131 struct ieee80211_rx_status *rx_status,
1132 struct ieee802_11_elems *elems,
1133 bool beacon)
1134 {
1135 struct ieee80211_local *local = sdata->local;
1136 int freq;
1137 struct ieee80211_bss *bss;
1138 struct ieee80211_channel *channel;
1139
1140 if (elems->ds_params && elems->ds_params_len == 1)
1141 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1142 else
1143 freq = rx_status->freq;
1144
1145 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1146
1147 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1148 return;
1149
1150 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1151 channel, beacon);
1152 if (bss)
1153 ieee80211_rx_bss_put(local, bss);
1154
1155 if (!sdata->u.mgd.associated)
1156 return;
1157
1158 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1159 (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1160 ETH_ALEN) == 0)) {
1161 struct ieee80211_channel_sw_ie *sw_elem =
1162 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1163 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1164 }
1165 }
1166
1167
1168 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1169 struct sk_buff *skb)
1170 {
1171 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1172 struct ieee80211_if_managed *ifmgd;
1173 struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1174 size_t baselen, len = skb->len;
1175 struct ieee802_11_elems elems;
1176
1177 ifmgd = &sdata->u.mgd;
1178
1179 ASSERT_MGD_MTX(ifmgd);
1180
1181 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1182 return; /* ignore ProbeResp to foreign address */
1183
1184 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1185 if (baselen > len)
1186 return;
1187
1188 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1189 &elems);
1190
1191 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1192
1193 if (ifmgd->associated &&
1194 memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1195 ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1196 IEEE80211_STA_CONNECTION_POLL)) {
1197 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1198 IEEE80211_STA_BEACON_POLL);
1199 mutex_lock(&sdata->local->iflist_mtx);
1200 ieee80211_recalc_ps(sdata->local, -1);
1201 mutex_unlock(&sdata->local->iflist_mtx);
1202 /*
1203 * We've received a probe response, but are not sure whether
1204 * we have or will be receiving any beacons or data, so let's
1205 * schedule the timers again, just in case.
1206 */
1207 mod_beacon_timer(sdata);
1208 mod_timer(&ifmgd->conn_mon_timer,
1209 round_jiffies_up(jiffies +
1210 IEEE80211_CONNECTION_IDLE_TIME));
1211 }
1212 }
1213
1214 /*
1215 * This is the canonical list of information elements we care about,
1216 * the filter code also gives us all changes to the Microsoft OUI
1217 * (00:50:F2) vendor IE which is used for WMM which we need to track.
1218 *
1219 * We implement beacon filtering in software since that means we can
1220 * avoid processing the frame here and in cfg80211, and userspace
1221 * will not be able to tell whether the hardware supports it or not.
1222 *
1223 * XXX: This list needs to be dynamic -- userspace needs to be able to
1224 * add items it requires. It also needs to be able to tell us to
1225 * look out for other vendor IEs.
1226 */
1227 static const u64 care_about_ies =
1228 (1ULL << WLAN_EID_COUNTRY) |
1229 (1ULL << WLAN_EID_ERP_INFO) |
1230 (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1231 (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1232 (1ULL << WLAN_EID_HT_CAPABILITY) |
1233 (1ULL << WLAN_EID_HT_INFORMATION);
1234
1235 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1236 struct ieee80211_mgmt *mgmt,
1237 size_t len,
1238 struct ieee80211_rx_status *rx_status)
1239 {
1240 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1241 size_t baselen;
1242 struct ieee802_11_elems elems;
1243 struct ieee80211_local *local = sdata->local;
1244 u32 changed = 0;
1245 bool erp_valid, directed_tim = false;
1246 u8 erp_value = 0;
1247 u32 ncrc;
1248 u8 *bssid;
1249
1250 ASSERT_MGD_MTX(ifmgd);
1251
1252 /* Process beacon from the current BSS */
1253 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1254 if (baselen > len)
1255 return;
1256
1257 if (rx_status->freq != local->hw.conf.channel->center_freq)
1258 return;
1259
1260 /*
1261 * We might have received a number of frames, among them a
1262 * disassoc frame and a beacon...
1263 */
1264 if (!ifmgd->associated)
1265 return;
1266
1267 bssid = ifmgd->associated->bssid;
1268
1269 /*
1270 * And in theory even frames from a different AP we were just
1271 * associated to a split-second ago!
1272 */
1273 if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1274 return;
1275
1276 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1277 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1278 if (net_ratelimit()) {
1279 printk(KERN_DEBUG "%s: cancelling probereq poll due "
1280 "to a received beacon\n", sdata->name);
1281 }
1282 #endif
1283 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1284 mutex_lock(&local->iflist_mtx);
1285 ieee80211_recalc_ps(local, -1);
1286 mutex_unlock(&local->iflist_mtx);
1287 }
1288
1289 /*
1290 * Push the beacon loss detection into the future since
1291 * we are processing a beacon from the AP just now.
1292 */
1293 mod_beacon_timer(sdata);
1294
1295 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1296 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1297 len - baselen, &elems,
1298 care_about_ies, ncrc);
1299
1300 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1301 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1302 ifmgd->aid);
1303
1304 if (ncrc != ifmgd->beacon_crc) {
1305 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1306 true);
1307
1308 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1309 elems.wmm_param_len);
1310 }
1311
1312 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1313 if (directed_tim) {
1314 if (local->hw.conf.dynamic_ps_timeout > 0) {
1315 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1316 ieee80211_hw_config(local,
1317 IEEE80211_CONF_CHANGE_PS);
1318 ieee80211_send_nullfunc(local, sdata, 0);
1319 } else {
1320 local->pspolling = true;
1321
1322 /*
1323 * Here is assumed that the driver will be
1324 * able to send ps-poll frame and receive a
1325 * response even though power save mode is
1326 * enabled, but some drivers might require
1327 * to disable power save here. This needs
1328 * to be investigated.
1329 */
1330 ieee80211_send_pspoll(local, sdata);
1331 }
1332 }
1333 }
1334
1335 if (ncrc == ifmgd->beacon_crc)
1336 return;
1337 ifmgd->beacon_crc = ncrc;
1338
1339 if (elems.erp_info && elems.erp_info_len >= 1) {
1340 erp_valid = true;
1341 erp_value = elems.erp_info[0];
1342 } else {
1343 erp_valid = false;
1344 }
1345 changed |= ieee80211_handle_bss_capability(sdata,
1346 le16_to_cpu(mgmt->u.beacon.capab_info),
1347 erp_valid, erp_value);
1348
1349
1350 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1351 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1352 struct sta_info *sta;
1353 struct ieee80211_supported_band *sband;
1354 u16 ap_ht_cap_flags;
1355
1356 rcu_read_lock();
1357
1358 sta = sta_info_get(sdata, bssid);
1359 if (WARN_ON(!sta)) {
1360 rcu_read_unlock();
1361 return;
1362 }
1363
1364 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1365
1366 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1367 elems.ht_cap_elem, &sta->sta.ht_cap);
1368
1369 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1370
1371 rcu_read_unlock();
1372
1373 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1374 bssid, ap_ht_cap_flags);
1375 }
1376
1377 /* Note: country IE parsing is done for us by cfg80211 */
1378 if (elems.country_elem) {
1379 /* TODO: IBSS also needs this */
1380 if (elems.pwr_constr_elem)
1381 ieee80211_handle_pwr_constr(sdata,
1382 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1383 elems.pwr_constr_elem,
1384 elems.pwr_constr_elem_len);
1385 }
1386
1387 ieee80211_bss_info_change_notify(sdata, changed);
1388 }
1389
1390 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1391 struct sk_buff *skb)
1392 {
1393 struct ieee80211_local *local = sdata->local;
1394 struct ieee80211_mgmt *mgmt;
1395 u16 fc;
1396
1397 if (skb->len < 24)
1398 return RX_DROP_MONITOR;
1399
1400 mgmt = (struct ieee80211_mgmt *) skb->data;
1401 fc = le16_to_cpu(mgmt->frame_control);
1402
1403 switch (fc & IEEE80211_FCTL_STYPE) {
1404 case IEEE80211_STYPE_PROBE_RESP:
1405 case IEEE80211_STYPE_BEACON:
1406 case IEEE80211_STYPE_DEAUTH:
1407 case IEEE80211_STYPE_DISASSOC:
1408 case IEEE80211_STYPE_ACTION:
1409 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1410 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
1411 return RX_QUEUED;
1412 }
1413
1414 return RX_DROP_MONITOR;
1415 }
1416
1417 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1418 struct sk_buff *skb)
1419 {
1420 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1421 struct ieee80211_rx_status *rx_status;
1422 struct ieee80211_mgmt *mgmt;
1423 enum rx_mgmt_action rma = RX_MGMT_NONE;
1424 u16 fc;
1425
1426 rx_status = (struct ieee80211_rx_status *) skb->cb;
1427 mgmt = (struct ieee80211_mgmt *) skb->data;
1428 fc = le16_to_cpu(mgmt->frame_control);
1429
1430 mutex_lock(&ifmgd->mtx);
1431
1432 if (ifmgd->associated &&
1433 memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1434 switch (fc & IEEE80211_FCTL_STYPE) {
1435 case IEEE80211_STYPE_BEACON:
1436 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1437 rx_status);
1438 break;
1439 case IEEE80211_STYPE_PROBE_RESP:
1440 ieee80211_rx_mgmt_probe_resp(sdata, skb);
1441 break;
1442 case IEEE80211_STYPE_DEAUTH:
1443 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1444 break;
1445 case IEEE80211_STYPE_DISASSOC:
1446 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1447 break;
1448 case IEEE80211_STYPE_ACTION:
1449 /* XXX: differentiate, can only happen for CSA now! */
1450 ieee80211_sta_process_chanswitch(sdata,
1451 &mgmt->u.action.u.chan_switch.sw_elem,
1452 (void *)ifmgd->associated->priv);
1453 break;
1454 }
1455 mutex_unlock(&ifmgd->mtx);
1456
1457 switch (rma) {
1458 case RX_MGMT_NONE:
1459 /* no action */
1460 break;
1461 case RX_MGMT_CFG80211_DEAUTH:
1462 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1463 break;
1464 case RX_MGMT_CFG80211_DISASSOC:
1465 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1466 break;
1467 default:
1468 WARN(1, "unexpected: %d", rma);
1469 }
1470 goto out;
1471 }
1472
1473 mutex_unlock(&ifmgd->mtx);
1474
1475 if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1476 (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH)
1477 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1478
1479 out:
1480 kfree_skb(skb);
1481 }
1482
1483 static void ieee80211_sta_timer(unsigned long data)
1484 {
1485 struct ieee80211_sub_if_data *sdata =
1486 (struct ieee80211_sub_if_data *) data;
1487 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1488 struct ieee80211_local *local = sdata->local;
1489
1490 if (local->quiescing) {
1491 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1492 return;
1493 }
1494
1495 ieee80211_queue_work(&local->hw, &ifmgd->work);
1496 }
1497
1498 static void ieee80211_sta_work(struct work_struct *work)
1499 {
1500 struct ieee80211_sub_if_data *sdata =
1501 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1502 struct ieee80211_local *local = sdata->local;
1503 struct ieee80211_if_managed *ifmgd;
1504 struct sk_buff *skb;
1505
1506 if (!ieee80211_sdata_running(sdata))
1507 return;
1508
1509 if (local->scanning)
1510 return;
1511
1512 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1513 return;
1514
1515 /*
1516 * ieee80211_queue_work() should have picked up most cases,
1517 * here we'll pick the the rest.
1518 */
1519 if (WARN(local->suspended, "STA MLME work scheduled while "
1520 "going to suspend\n"))
1521 return;
1522
1523 ifmgd = &sdata->u.mgd;
1524
1525 /* first process frames to avoid timing out while a frame is pending */
1526 while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1527 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1528
1529 /* then process the rest of the work */
1530 mutex_lock(&ifmgd->mtx);
1531
1532 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1533 IEEE80211_STA_CONNECTION_POLL) &&
1534 ifmgd->associated) {
1535 u8 bssid[ETH_ALEN];
1536
1537 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1538 if (time_is_after_jiffies(ifmgd->probe_timeout))
1539 run_again(ifmgd, ifmgd->probe_timeout);
1540
1541 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1542 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1543 printk(KERN_DEBUG "No probe response from AP %pM"
1544 " after %dms, try %d\n", bssid,
1545 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1546 ifmgd->probe_send_count);
1547 #endif
1548 ieee80211_mgd_probe_ap_send(sdata);
1549 } else {
1550 /*
1551 * We actually lost the connection ... or did we?
1552 * Let's make sure!
1553 */
1554 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1555 IEEE80211_STA_BEACON_POLL);
1556 printk(KERN_DEBUG "No probe response from AP %pM"
1557 " after %dms, disconnecting.\n",
1558 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1559 ieee80211_set_disassoc(sdata);
1560 ieee80211_recalc_idle(local);
1561 mutex_unlock(&ifmgd->mtx);
1562 /*
1563 * must be outside lock due to cfg80211,
1564 * but that's not a problem.
1565 */
1566 ieee80211_send_deauth_disassoc(sdata, bssid,
1567 IEEE80211_STYPE_DEAUTH,
1568 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1569 NULL);
1570 mutex_lock(&ifmgd->mtx);
1571 }
1572 }
1573
1574 mutex_unlock(&ifmgd->mtx);
1575 }
1576
1577 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1578 {
1579 struct ieee80211_sub_if_data *sdata =
1580 (struct ieee80211_sub_if_data *) data;
1581 struct ieee80211_local *local = sdata->local;
1582
1583 if (local->quiescing)
1584 return;
1585
1586 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
1587 }
1588
1589 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1590 {
1591 struct ieee80211_sub_if_data *sdata =
1592 (struct ieee80211_sub_if_data *) data;
1593 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1594 struct ieee80211_local *local = sdata->local;
1595
1596 if (local->quiescing)
1597 return;
1598
1599 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1600 }
1601
1602 static void ieee80211_sta_monitor_work(struct work_struct *work)
1603 {
1604 struct ieee80211_sub_if_data *sdata =
1605 container_of(work, struct ieee80211_sub_if_data,
1606 u.mgd.monitor_work);
1607
1608 ieee80211_mgd_probe_ap(sdata, false);
1609 }
1610
1611 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1612 {
1613 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1614 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1615 IEEE80211_STA_CONNECTION_POLL);
1616
1617 /* let's probe the connection once */
1618 ieee80211_queue_work(&sdata->local->hw,
1619 &sdata->u.mgd.monitor_work);
1620 /* and do all the other regular work too */
1621 ieee80211_queue_work(&sdata->local->hw,
1622 &sdata->u.mgd.work);
1623 }
1624 }
1625
1626 #ifdef CONFIG_PM
1627 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1628 {
1629 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1630
1631 /*
1632 * we need to use atomic bitops for the running bits
1633 * only because both timers might fire at the same
1634 * time -- the code here is properly synchronised.
1635 */
1636
1637 cancel_work_sync(&ifmgd->work);
1638 cancel_work_sync(&ifmgd->beacon_loss_work);
1639 if (del_timer_sync(&ifmgd->timer))
1640 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1641
1642 cancel_work_sync(&ifmgd->chswitch_work);
1643 if (del_timer_sync(&ifmgd->chswitch_timer))
1644 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1645
1646 cancel_work_sync(&ifmgd->monitor_work);
1647 /* these will just be re-established on connection */
1648 del_timer_sync(&ifmgd->conn_mon_timer);
1649 del_timer_sync(&ifmgd->bcn_mon_timer);
1650 }
1651
1652 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1653 {
1654 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1655
1656 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1657 add_timer(&ifmgd->timer);
1658 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1659 add_timer(&ifmgd->chswitch_timer);
1660 }
1661 #endif
1662
1663 /* interface setup */
1664 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1665 {
1666 struct ieee80211_if_managed *ifmgd;
1667
1668 ifmgd = &sdata->u.mgd;
1669 INIT_WORK(&ifmgd->work, ieee80211_sta_work);
1670 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1671 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1672 INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
1673 setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1674 (unsigned long) sdata);
1675 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1676 (unsigned long) sdata);
1677 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1678 (unsigned long) sdata);
1679 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1680 (unsigned long) sdata);
1681 skb_queue_head_init(&ifmgd->skb_queue);
1682
1683 ifmgd->flags = 0;
1684
1685 mutex_init(&ifmgd->mtx);
1686
1687 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1688 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1689 else
1690 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1691 }
1692
1693 /* scan finished notification */
1694 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1695 {
1696 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1697
1698 /* Restart STA timers */
1699 rcu_read_lock();
1700 list_for_each_entry_rcu(sdata, &local->interfaces, list)
1701 ieee80211_restart_sta_timer(sdata);
1702 rcu_read_unlock();
1703 }
1704
1705 int ieee80211_max_network_latency(struct notifier_block *nb,
1706 unsigned long data, void *dummy)
1707 {
1708 s32 latency_usec = (s32) data;
1709 struct ieee80211_local *local =
1710 container_of(nb, struct ieee80211_local,
1711 network_latency_notifier);
1712
1713 mutex_lock(&local->iflist_mtx);
1714 ieee80211_recalc_ps(local, latency_usec);
1715 mutex_unlock(&local->iflist_mtx);
1716
1717 return 0;
1718 }
1719
1720 /* config hooks */
1721 static enum work_done_result
1722 ieee80211_probe_auth_done(struct ieee80211_work *wk,
1723 struct sk_buff *skb)
1724 {
1725 if (!skb) {
1726 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
1727 return WORK_DONE_DESTROY;
1728 }
1729
1730 if (wk->type == IEEE80211_WORK_AUTH) {
1731 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
1732 return WORK_DONE_DESTROY;
1733 }
1734
1735 mutex_lock(&wk->sdata->u.mgd.mtx);
1736 ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
1737 mutex_unlock(&wk->sdata->u.mgd.mtx);
1738
1739 wk->type = IEEE80211_WORK_AUTH;
1740 wk->probe_auth.tries = 0;
1741 return WORK_DONE_REQUEUE;
1742 }
1743
1744 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
1745 struct cfg80211_auth_request *req)
1746 {
1747 const u8 *ssid;
1748 struct ieee80211_work *wk;
1749 u16 auth_alg;
1750
1751 switch (req->auth_type) {
1752 case NL80211_AUTHTYPE_OPEN_SYSTEM:
1753 auth_alg = WLAN_AUTH_OPEN;
1754 break;
1755 case NL80211_AUTHTYPE_SHARED_KEY:
1756 auth_alg = WLAN_AUTH_SHARED_KEY;
1757 break;
1758 case NL80211_AUTHTYPE_FT:
1759 auth_alg = WLAN_AUTH_FT;
1760 break;
1761 case NL80211_AUTHTYPE_NETWORK_EAP:
1762 auth_alg = WLAN_AUTH_LEAP;
1763 break;
1764 default:
1765 return -EOPNOTSUPP;
1766 }
1767
1768 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1769 if (!wk)
1770 return -ENOMEM;
1771
1772 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);;
1773
1774 if (req->ie && req->ie_len) {
1775 memcpy(wk->ie, req->ie, req->ie_len);
1776 wk->ie_len = req->ie_len;
1777 }
1778
1779 if (req->key && req->key_len) {
1780 wk->probe_auth.key_len = req->key_len;
1781 wk->probe_auth.key_idx = req->key_idx;
1782 memcpy(wk->probe_auth.key, req->key, req->key_len);
1783 }
1784
1785 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1786 memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
1787 wk->probe_auth.ssid_len = ssid[1];
1788
1789 wk->probe_auth.algorithm = auth_alg;
1790 wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
1791
1792 wk->type = IEEE80211_WORK_DIRECT_PROBE;
1793 wk->chan = req->bss->channel;
1794 wk->sdata = sdata;
1795 wk->done = ieee80211_probe_auth_done;
1796
1797 /*
1798 * XXX: if still associated need to tell AP that we're going
1799 * to sleep and then change channel etc.
1800 * For now switch channel here, later will be handled
1801 * by submitting this as an off-channel work item.
1802 */
1803 sdata->local->oper_channel = req->bss->channel;
1804 ieee80211_hw_config(sdata->local, 0);
1805
1806 ieee80211_add_work(wk);
1807 return 0;
1808 }
1809
1810 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
1811 struct sk_buff *skb)
1812 {
1813 struct ieee80211_mgmt *mgmt;
1814 u16 status;
1815
1816 if (!skb) {
1817 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
1818 return WORK_DONE_DESTROY;
1819 }
1820
1821 mgmt = (void *)skb->data;
1822 status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1823
1824 if (status == WLAN_STATUS_SUCCESS) {
1825 mutex_lock(&wk->sdata->u.mgd.mtx);
1826 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
1827 mutex_unlock(&wk->sdata->u.mgd.mtx);
1828 /* oops -- internal error -- send timeout for now */
1829 cfg80211_send_assoc_timeout(wk->sdata->dev,
1830 wk->filter_ta);
1831 return WORK_DONE_DESTROY;
1832 }
1833 mutex_unlock(&wk->sdata->u.mgd.mtx);
1834 }
1835
1836 cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
1837 return WORK_DONE_DESTROY;
1838 }
1839
1840 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
1841 struct cfg80211_assoc_request *req)
1842 {
1843 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1844 struct ieee80211_bss *bss = (void *)req->bss->priv;
1845 struct ieee80211_work *wk;
1846 const u8 *ssid;
1847 int i;
1848
1849 mutex_lock(&ifmgd->mtx);
1850 if (ifmgd->associated) {
1851 mutex_unlock(&ifmgd->mtx);
1852 return -EALREADY;
1853 }
1854 mutex_unlock(&ifmgd->mtx);
1855
1856 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1857 if (!wk)
1858 return -ENOMEM;
1859
1860 ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
1861
1862 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
1863 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
1864 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
1865 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
1866 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
1867
1868
1869 if (req->ie && req->ie_len) {
1870 memcpy(wk->ie, req->ie, req->ie_len);
1871 wk->ie_len = req->ie_len;
1872 } else
1873 wk->ie_len = 0;
1874
1875 wk->assoc.bss = req->bss;
1876
1877 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1878
1879 /* new association always uses requested smps mode */
1880 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
1881 if (ifmgd->powersave)
1882 ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
1883 else
1884 ifmgd->ap_smps = IEEE80211_SMPS_OFF;
1885 } else
1886 ifmgd->ap_smps = ifmgd->req_smps;
1887
1888 wk->assoc.smps = ifmgd->ap_smps;
1889 /*
1890 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
1891 * We still associate in non-HT mode (11a/b/g) if any one of these
1892 * ciphers is configured as pairwise.
1893 * We can set this to true for non-11n hardware, that'll be checked
1894 * separately along with the peer capabilities.
1895 */
1896 wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
1897 wk->assoc.capability = req->bss->capability;
1898 wk->assoc.wmm_used = bss->wmm_used;
1899 wk->assoc.supp_rates = bss->supp_rates;
1900 wk->assoc.supp_rates_len = bss->supp_rates_len;
1901 wk->assoc.ht_information_ie =
1902 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
1903
1904 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1905 memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
1906 wk->assoc.ssid_len = ssid[1];
1907
1908 if (req->prev_bssid)
1909 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
1910
1911 wk->type = IEEE80211_WORK_ASSOC;
1912 wk->chan = req->bss->channel;
1913 wk->sdata = sdata;
1914 wk->done = ieee80211_assoc_done;
1915
1916 if (req->use_mfp) {
1917 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
1918 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
1919 } else {
1920 ifmgd->mfp = IEEE80211_MFP_DISABLED;
1921 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
1922 }
1923
1924 if (req->crypto.control_port)
1925 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
1926 else
1927 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
1928
1929 sdata->local->oper_channel = req->bss->channel;
1930 ieee80211_hw_config(sdata->local, 0);
1931
1932 ieee80211_add_work(wk);
1933 return 0;
1934 }
1935
1936 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
1937 struct cfg80211_deauth_request *req,
1938 void *cookie)
1939 {
1940 struct ieee80211_local *local = sdata->local;
1941 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1942 struct ieee80211_work *wk;
1943 const u8 *bssid = req->bss->bssid;
1944
1945 mutex_lock(&ifmgd->mtx);
1946
1947 if (ifmgd->associated == req->bss) {
1948 bssid = req->bss->bssid;
1949 ieee80211_set_disassoc(sdata);
1950 mutex_unlock(&ifmgd->mtx);
1951 } else {
1952 bool not_auth_yet = false;
1953
1954 mutex_unlock(&ifmgd->mtx);
1955
1956 mutex_lock(&local->work_mtx);
1957 list_for_each_entry(wk, &local->work_list, list) {
1958 if (wk->type != IEEE80211_WORK_DIRECT_PROBE)
1959 continue;
1960 if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
1961 continue;
1962 not_auth_yet = true;
1963 list_del(&wk->list);
1964 free_work(wk);
1965 break;
1966 }
1967 mutex_unlock(&local->work_mtx);
1968
1969 /*
1970 * If somebody requests authentication and we haven't
1971 * sent out an auth frame yet there's no need to send
1972 * out a deauth frame either. If the state was PROBE,
1973 * then this is the case. If it's AUTH we have sent a
1974 * frame, and if it's IDLE we have completed the auth
1975 * process already.
1976 */
1977 if (not_auth_yet) {
1978 __cfg80211_auth_canceled(sdata->dev, bssid);
1979 return 0;
1980 }
1981 }
1982
1983 printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
1984 sdata->name, bssid, req->reason_code);
1985
1986 ieee80211_send_deauth_disassoc(sdata, bssid,
1987 IEEE80211_STYPE_DEAUTH, req->reason_code,
1988 cookie);
1989
1990 ieee80211_recalc_idle(sdata->local);
1991
1992 return 0;
1993 }
1994
1995 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
1996 struct cfg80211_disassoc_request *req,
1997 void *cookie)
1998 {
1999 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2000
2001 mutex_lock(&ifmgd->mtx);
2002
2003 /*
2004 * cfg80211 should catch this ... but it's racy since
2005 * we can receive a disassoc frame, process it, hand it
2006 * to cfg80211 while that's in a locked section already
2007 * trying to tell us that the user wants to disconnect.
2008 */
2009 if (ifmgd->associated != req->bss) {
2010 mutex_unlock(&ifmgd->mtx);
2011 return -ENOLINK;
2012 }
2013
2014 printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2015 sdata->name, req->bss->bssid, req->reason_code);
2016
2017 ieee80211_set_disassoc(sdata);
2018
2019 mutex_unlock(&ifmgd->mtx);
2020
2021 ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2022 IEEE80211_STYPE_DISASSOC, req->reason_code,
2023 cookie);
2024
2025 ieee80211_recalc_idle(sdata->local);
2026
2027 return 0;
2028 }
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