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 static int max_nullfunc_tries = 2;
32 module_param(max_nullfunc_tries, int, 0644);
33 MODULE_PARM_DESC(max_nullfunc_tries,
34 "Maximum nullfunc tx tries before disconnecting (reason 4).");
35
36 static int max_probe_tries = 5;
37 module_param(max_probe_tries, int, 0644);
38 MODULE_PARM_DESC(max_probe_tries,
39 "Maximum probe tries before disconnecting (reason 4).");
40
41 /*
42 * Beacon loss timeout is calculated as N frames times the
43 * advertised beacon interval. This may need to be somewhat
44 * higher than what hardware might detect to account for
45 * delays in the host processing frames. But since we also
46 * probe on beacon miss before declaring the connection lost
47 * default to what we want.
48 */
49 #define IEEE80211_BEACON_LOSS_COUNT 7
50
51 /*
52 * Time the connection can be idle before we probe
53 * it to see if we can still talk to the AP.
54 */
55 #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ)
56 /*
57 * Time we wait for a probe response after sending
58 * a probe request because of beacon loss or for
59 * checking the connection still works.
60 */
61 static int probe_wait_ms = 500;
62 module_param(probe_wait_ms, int, 0644);
63 MODULE_PARM_DESC(probe_wait_ms,
64 "Maximum time(ms) to wait for probe response"
65 " before disconnecting (reason 4).");
66
67 /*
68 * Weight given to the latest Beacon frame when calculating average signal
69 * strength for Beacon frames received in the current BSS. This must be
70 * between 1 and 15.
71 */
72 #define IEEE80211_SIGNAL_AVE_WEIGHT 3
73
74 /*
75 * How many Beacon frames need to have been used in average signal strength
76 * before starting to indicate signal change events.
77 */
78 #define IEEE80211_SIGNAL_AVE_MIN_COUNT 4
79
80 #define TMR_RUNNING_TIMER 0
81 #define TMR_RUNNING_CHANSW 1
82
83 /*
84 * All cfg80211 functions have to be called outside a locked
85 * section so that they can acquire a lock themselves... This
86 * is much simpler than queuing up things in cfg80211, but we
87 * do need some indirection for that here.
88 */
89 enum rx_mgmt_action {
90 /* no action required */
91 RX_MGMT_NONE,
92
93 /* caller must call cfg80211_send_rx_auth() */
94 RX_MGMT_CFG80211_AUTH,
95
96 /* caller must call cfg80211_send_rx_assoc() */
97 RX_MGMT_CFG80211_ASSOC,
98
99 /* caller must call cfg80211_send_deauth() */
100 RX_MGMT_CFG80211_DEAUTH,
101
102 /* caller must call cfg80211_send_disassoc() */
103 RX_MGMT_CFG80211_DISASSOC,
104
105 /* caller must tell cfg80211 about internal error */
106 RX_MGMT_CFG80211_ASSOC_ERROR,
107 };
108
109 /* utils */
ASSERT_MGD_MTX(struct ieee80211_if_managed * ifmgd)110 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
111 {
112 lockdep_assert_held(&ifmgd->mtx);
113 }
114
115 /*
116 * We can have multiple work items (and connection probing)
117 * scheduling this timer, but we need to take care to only
118 * reschedule it when it should fire _earlier_ than it was
119 * asked for before, or if it's not pending right now. This
120 * function ensures that. Note that it then is required to
121 * run this function for all timeouts after the first one
122 * has happened -- the work that runs from this timer will
123 * do that.
124 */
run_again(struct ieee80211_if_managed * ifmgd,unsigned long timeout)125 static void run_again(struct ieee80211_if_managed *ifmgd,
126 unsigned long timeout)
127 {
128 ASSERT_MGD_MTX(ifmgd);
129
130 if (!timer_pending(&ifmgd->timer) ||
131 time_before(timeout, ifmgd->timer.expires))
132 mod_timer(&ifmgd->timer, timeout);
133 }
134
ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data * sdata)135 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
136 {
137 if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
138 return;
139
140 mod_timer(&sdata->u.mgd.bcn_mon_timer,
141 round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
142 }
143
ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data * sdata)144 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
145 {
146 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
147
148 if (unlikely(!sdata->u.mgd.associated))
149 return;
150
151 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
152 return;
153
154 mod_timer(&sdata->u.mgd.conn_mon_timer,
155 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
156
157 ifmgd->probe_send_count = 0;
158 }
159
ecw2cw(int ecw)160 static int ecw2cw(int ecw)
161 {
162 return (1 << ecw) - 1;
163 }
164
165 /*
166 * ieee80211_enable_ht should be called only after the operating band
167 * has been determined as ht configuration depends on the hw's
168 * HT abilities for a specific band.
169 */
ieee80211_enable_ht(struct ieee80211_sub_if_data * sdata,struct ieee80211_ht_info * hti,const u8 * bssid,u16 ap_ht_cap_flags)170 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
171 struct ieee80211_ht_info *hti,
172 const u8 *bssid, u16 ap_ht_cap_flags)
173 {
174 struct ieee80211_local *local = sdata->local;
175 struct ieee80211_supported_band *sband;
176 struct sta_info *sta;
177 u32 changed = 0;
178 int hti_cfreq;
179 u16 ht_opmode;
180 bool enable_ht = true;
181 enum nl80211_channel_type prev_chantype;
182 enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
183
184 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
185
186 prev_chantype = sdata->vif.bss_conf.channel_type;
187
188 /* HT is not supported */
189 if (!sband->ht_cap.ht_supported)
190 enable_ht = false;
191
192 if (enable_ht) {
193 hti_cfreq = ieee80211_channel_to_frequency(hti->control_chan,
194 sband->band);
195 /* check that channel matches the right operating channel */
196 if (local->hw.conf.channel->center_freq != hti_cfreq) {
197 /* Some APs mess this up, evidently.
198 * Netgear WNDR3700 sometimes reports 4 higher than
199 * the actual channel, for instance.
200 */
201 printk(KERN_DEBUG
202 "%s: Wrong control channel in association"
203 " response: configured center-freq: %d"
204 " hti-cfreq: %d hti->control_chan: %d"
205 " band: %d. Disabling HT.\n",
206 sdata->name,
207 local->hw.conf.channel->center_freq,
208 hti_cfreq, hti->control_chan,
209 sband->band);
210 enable_ht = false;
211 }
212 }
213
214 if (enable_ht) {
215 channel_type = NL80211_CHAN_HT20;
216
217 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
218 (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
219 (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
220 switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
221 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
222 if (!(local->hw.conf.channel->flags &
223 IEEE80211_CHAN_NO_HT40PLUS))
224 channel_type = NL80211_CHAN_HT40PLUS;
225 break;
226 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
227 if (!(local->hw.conf.channel->flags &
228 IEEE80211_CHAN_NO_HT40MINUS))
229 channel_type = NL80211_CHAN_HT40MINUS;
230 break;
231 }
232 }
233 }
234
235 if (local->tmp_channel)
236 local->tmp_channel_type = channel_type;
237
238 if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
239 /* can only fail due to HT40+/- mismatch */
240 channel_type = NL80211_CHAN_HT20;
241 WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type));
242 }
243
244 /* channel_type change automatically detected */
245 ieee80211_hw_config(local, 0);
246
247 if (prev_chantype != channel_type) {
248 rcu_read_lock();
249 sta = sta_info_get(sdata, bssid);
250 if (sta)
251 rate_control_rate_update(local, sband, sta,
252 IEEE80211_RC_HT_CHANGED,
253 channel_type);
254 rcu_read_unlock();
255 }
256
257 ht_opmode = le16_to_cpu(hti->operation_mode);
258
259 /* if bss configuration changed store the new one */
260 if (sdata->ht_opmode_valid != enable_ht ||
261 sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
262 prev_chantype != channel_type) {
263 changed |= BSS_CHANGED_HT;
264 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
265 sdata->ht_opmode_valid = enable_ht;
266 }
267
268 return changed;
269 }
270
271 /* frame sending functions */
272
ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data * sdata,const u8 * bssid,u16 stype,u16 reason,void * cookie,bool send_frame)273 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
274 const u8 *bssid, u16 stype, u16 reason,
275 void *cookie, bool send_frame)
276 {
277 struct ieee80211_local *local = sdata->local;
278 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
279 struct sk_buff *skb;
280 struct ieee80211_mgmt *mgmt;
281
282 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
283 if (!skb) {
284 printk(KERN_DEBUG "%s: failed to allocate buffer for "
285 "deauth/disassoc frame\n", sdata->name);
286 return;
287 }
288 skb_reserve(skb, local->hw.extra_tx_headroom);
289
290 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
291 memset(mgmt, 0, 24);
292 memcpy(mgmt->da, bssid, ETH_ALEN);
293 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
294 memcpy(mgmt->bssid, bssid, ETH_ALEN);
295 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
296 skb_put(skb, 2);
297 /* u.deauth.reason_code == u.disassoc.reason_code */
298 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
299
300 if (stype == IEEE80211_STYPE_DEAUTH)
301 if (cookie)
302 __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
303 else
304 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
305 else
306 if (cookie)
307 __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
308 else
309 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
310 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
311 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
312
313 if (send_frame)
314 ieee80211_tx_skb(sdata, skb);
315 else
316 kfree_skb(skb);
317 }
318
ieee80211_send_pspoll(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata)319 void ieee80211_send_pspoll(struct ieee80211_local *local,
320 struct ieee80211_sub_if_data *sdata)
321 {
322 struct ieee80211_pspoll *pspoll;
323 struct sk_buff *skb;
324
325 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
326 if (!skb)
327 return;
328
329 pspoll = (struct ieee80211_pspoll *) skb->data;
330 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
331
332 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
333 ieee80211_tx_skb(sdata, skb);
334 }
335
ieee80211_send_nullfunc(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata,int powersave)336 void ieee80211_send_nullfunc(struct ieee80211_local *local,
337 struct ieee80211_sub_if_data *sdata,
338 int powersave)
339 {
340 struct sk_buff *skb;
341 struct ieee80211_hdr_3addr *nullfunc;
342
343 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
344 if (!skb)
345 return;
346
347 nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
348 if (powersave)
349 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
350
351 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
352 ieee80211_tx_skb(sdata, skb);
353 }
354
ieee80211_send_4addr_nullfunc(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata)355 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
356 struct ieee80211_sub_if_data *sdata)
357 {
358 struct sk_buff *skb;
359 struct ieee80211_hdr *nullfunc;
360 __le16 fc;
361
362 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
363 return;
364
365 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
366 if (!skb) {
367 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
368 "nullfunc frame\n", sdata->name);
369 return;
370 }
371 skb_reserve(skb, local->hw.extra_tx_headroom);
372
373 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
374 memset(nullfunc, 0, 30);
375 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
376 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
377 nullfunc->frame_control = fc;
378 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
379 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
380 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
381 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
382
383 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
384 ieee80211_tx_skb(sdata, skb);
385 }
386
387 /* spectrum management related things */
ieee80211_chswitch_work(struct work_struct * work)388 static void ieee80211_chswitch_work(struct work_struct *work)
389 {
390 struct ieee80211_sub_if_data *sdata =
391 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
392 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
393
394 if (!ieee80211_sdata_running(sdata))
395 return;
396
397 mutex_lock(&ifmgd->mtx);
398 if (!ifmgd->associated)
399 goto out;
400
401 sdata->local->oper_channel = sdata->local->csa_channel;
402 if (!sdata->local->ops->channel_switch) {
403 /* call "hw_config" only if doing sw channel switch */
404 ieee80211_hw_config(sdata->local,
405 IEEE80211_CONF_CHANGE_CHANNEL);
406 }
407
408 /* XXX: shouldn't really modify cfg80211-owned data! */
409 ifmgd->associated->channel = sdata->local->oper_channel;
410
411 ieee80211_wake_queues_by_reason(&sdata->local->hw,
412 IEEE80211_QUEUE_STOP_REASON_CSA);
413 out:
414 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
415 mutex_unlock(&ifmgd->mtx);
416 }
417
ieee80211_chswitch_done(struct ieee80211_vif * vif,bool success)418 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
419 {
420 struct ieee80211_sub_if_data *sdata;
421 struct ieee80211_if_managed *ifmgd;
422
423 sdata = vif_to_sdata(vif);
424 ifmgd = &sdata->u.mgd;
425
426 trace_api_chswitch_done(sdata, success);
427 if (!success) {
428 /*
429 * If the channel switch was not successful, stay
430 * around on the old channel. We currently lack
431 * good handling of this situation, possibly we
432 * should just drop the association.
433 */
434 sdata->local->csa_channel = sdata->local->oper_channel;
435 }
436
437 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
438 }
439 EXPORT_SYMBOL(ieee80211_chswitch_done);
440
ieee80211_chswitch_timer(unsigned long data)441 static void ieee80211_chswitch_timer(unsigned long data)
442 {
443 struct ieee80211_sub_if_data *sdata =
444 (struct ieee80211_sub_if_data *) data;
445 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
446
447 if (sdata->local->quiescing) {
448 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
449 return;
450 }
451
452 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
453 }
454
ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data * sdata,struct ieee80211_channel_sw_ie * sw_elem,struct ieee80211_bss * bss,u64 timestamp)455 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
456 struct ieee80211_channel_sw_ie *sw_elem,
457 struct ieee80211_bss *bss,
458 u64 timestamp)
459 {
460 struct cfg80211_bss *cbss =
461 container_of((void *)bss, struct cfg80211_bss, priv);
462 struct ieee80211_channel *new_ch;
463 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
464 int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
465 cbss->channel->band);
466
467 ASSERT_MGD_MTX(ifmgd);
468
469 if (!ifmgd->associated)
470 return;
471
472 if (sdata->local->scanning)
473 return;
474
475 /* Disregard subsequent beacons if we are already running a timer
476 processing a CSA */
477
478 if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
479 return;
480
481 new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
482 if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
483 return;
484
485 sdata->local->csa_channel = new_ch;
486
487 if (sdata->local->ops->channel_switch) {
488 /* use driver's channel switch callback */
489 struct ieee80211_channel_switch ch_switch;
490 memset(&ch_switch, 0, sizeof(ch_switch));
491 ch_switch.timestamp = timestamp;
492 if (sw_elem->mode) {
493 ch_switch.block_tx = true;
494 ieee80211_stop_queues_by_reason(&sdata->local->hw,
495 IEEE80211_QUEUE_STOP_REASON_CSA);
496 }
497 ch_switch.channel = new_ch;
498 ch_switch.count = sw_elem->count;
499 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
500 drv_channel_switch(sdata->local, &ch_switch);
501 return;
502 }
503
504 /* channel switch handled in software */
505 if (sw_elem->count <= 1) {
506 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
507 } else {
508 if (sw_elem->mode)
509 ieee80211_stop_queues_by_reason(&sdata->local->hw,
510 IEEE80211_QUEUE_STOP_REASON_CSA);
511 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
512 mod_timer(&ifmgd->chswitch_timer,
513 jiffies +
514 msecs_to_jiffies(sw_elem->count *
515 cbss->beacon_interval));
516 }
517 }
518
ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data * sdata,u16 capab_info,u8 * pwr_constr_elem,u8 pwr_constr_elem_len)519 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
520 u16 capab_info, u8 *pwr_constr_elem,
521 u8 pwr_constr_elem_len)
522 {
523 struct ieee80211_conf *conf = &sdata->local->hw.conf;
524
525 if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
526 return;
527
528 /* Power constraint IE length should be 1 octet */
529 if (pwr_constr_elem_len != 1)
530 return;
531
532 if ((*pwr_constr_elem <= conf->channel->max_power) &&
533 (*pwr_constr_elem != sdata->local->power_constr_level)) {
534 sdata->local->power_constr_level = *pwr_constr_elem;
535 ieee80211_hw_config(sdata->local, 0);
536 }
537 }
538
ieee80211_enable_dyn_ps(struct ieee80211_vif * vif)539 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
540 {
541 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
542 struct ieee80211_local *local = sdata->local;
543 struct ieee80211_conf *conf = &local->hw.conf;
544
545 WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
546 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
547 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
548
549 local->disable_dynamic_ps = false;
550 conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
551 }
552 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
553
ieee80211_disable_dyn_ps(struct ieee80211_vif * vif)554 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
555 {
556 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
557 struct ieee80211_local *local = sdata->local;
558 struct ieee80211_conf *conf = &local->hw.conf;
559
560 WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
561 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
562 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
563
564 local->disable_dynamic_ps = true;
565 conf->dynamic_ps_timeout = 0;
566 del_timer_sync(&local->dynamic_ps_timer);
567 ieee80211_queue_work(&local->hw,
568 &local->dynamic_ps_enable_work);
569 }
570 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
571
572 /* powersave */
ieee80211_enable_ps(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata)573 static void ieee80211_enable_ps(struct ieee80211_local *local,
574 struct ieee80211_sub_if_data *sdata)
575 {
576 struct ieee80211_conf *conf = &local->hw.conf;
577
578 /*
579 * If we are scanning right now then the parameters will
580 * take effect when scan finishes.
581 */
582 if (local->scanning)
583 return;
584
585 if (conf->dynamic_ps_timeout > 0 &&
586 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
587 mod_timer(&local->dynamic_ps_timer, jiffies +
588 msecs_to_jiffies(conf->dynamic_ps_timeout));
589 } else {
590 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
591 ieee80211_send_nullfunc(local, sdata, 1);
592
593 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
594 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
595 return;
596
597 conf->flags |= IEEE80211_CONF_PS;
598 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
599 }
600 }
601
ieee80211_change_ps(struct ieee80211_local * local)602 static void ieee80211_change_ps(struct ieee80211_local *local)
603 {
604 struct ieee80211_conf *conf = &local->hw.conf;
605
606 if (local->ps_sdata) {
607 ieee80211_enable_ps(local, local->ps_sdata);
608 } else if (conf->flags & IEEE80211_CONF_PS) {
609 conf->flags &= ~IEEE80211_CONF_PS;
610 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
611 del_timer_sync(&local->dynamic_ps_timer);
612 cancel_work_sync(&local->dynamic_ps_enable_work);
613 }
614 }
615
ieee80211_powersave_allowed(struct ieee80211_sub_if_data * sdata)616 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
617 {
618 struct ieee80211_if_managed *mgd = &sdata->u.mgd;
619 struct sta_info *sta = NULL;
620 u32 sta_flags = 0;
621
622 if (!mgd->powersave)
623 return false;
624
625 if (!mgd->associated)
626 return false;
627
628 if (!mgd->associated->beacon_ies)
629 return false;
630
631 if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
632 IEEE80211_STA_CONNECTION_POLL))
633 return false;
634
635 rcu_read_lock();
636 sta = sta_info_get(sdata, mgd->bssid);
637 if (sta)
638 sta_flags = get_sta_flags(sta);
639 rcu_read_unlock();
640
641 if (!(sta_flags & WLAN_STA_AUTHORIZED))
642 return false;
643
644 return true;
645 }
646
647 /* need to hold RTNL or interface lock */
ieee80211_recalc_ps(struct ieee80211_local * local,s32 latency)648 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
649 {
650 struct ieee80211_sub_if_data *sdata, *found = NULL;
651 int count = 0;
652 int timeout;
653
654 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
655 local->ps_sdata = NULL;
656 return;
657 }
658
659 if (!list_empty(&local->work_list)) {
660 local->ps_sdata = NULL;
661 goto change;
662 }
663
664 list_for_each_entry(sdata, &local->interfaces, list) {
665 if (!ieee80211_sdata_running(sdata))
666 continue;
667 if (sdata->vif.type == NL80211_IFTYPE_AP) {
668 /* If an AP vif is found, then disable PS
669 * by setting the count to zero thereby setting
670 * ps_sdata to NULL.
671 */
672 count = 0;
673 break;
674 }
675 if (sdata->vif.type != NL80211_IFTYPE_STATION)
676 continue;
677 found = sdata;
678 count++;
679 }
680
681 if (count == 1 && ieee80211_powersave_allowed(found)) {
682 struct ieee80211_conf *conf = &local->hw.conf;
683 s32 beaconint_us;
684
685 if (latency < 0)
686 latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
687
688 beaconint_us = ieee80211_tu_to_usec(
689 found->vif.bss_conf.beacon_int);
690
691 timeout = local->dynamic_ps_forced_timeout;
692 if (timeout < 0) {
693 /*
694 * Go to full PSM if the user configures a very low
695 * latency requirement.
696 * The 2000 second value is there for compatibility
697 * until the PM_QOS_NETWORK_LATENCY is configured
698 * with real values.
699 */
700 if (latency > (1900 * USEC_PER_MSEC) &&
701 latency != (2000 * USEC_PER_SEC))
702 timeout = 0;
703 else
704 timeout = 100;
705 }
706 local->dynamic_ps_user_timeout = timeout;
707 if (!local->disable_dynamic_ps)
708 conf->dynamic_ps_timeout =
709 local->dynamic_ps_user_timeout;
710
711 if (beaconint_us > latency) {
712 local->ps_sdata = NULL;
713 } else {
714 struct ieee80211_bss *bss;
715 int maxslp = 1;
716 u8 dtimper;
717
718 bss = (void *)found->u.mgd.associated->priv;
719 dtimper = bss->dtim_period;
720
721 /* If the TIM IE is invalid, pretend the value is 1 */
722 if (!dtimper)
723 dtimper = 1;
724 else if (dtimper > 1)
725 maxslp = min_t(int, dtimper,
726 latency / beaconint_us);
727
728 local->hw.conf.max_sleep_period = maxslp;
729 local->hw.conf.ps_dtim_period = dtimper;
730 local->ps_sdata = found;
731 }
732 } else {
733 local->ps_sdata = NULL;
734 }
735
736 change:
737 ieee80211_change_ps(local);
738 }
739
ieee80211_dynamic_ps_disable_work(struct work_struct * work)740 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
741 {
742 struct ieee80211_local *local =
743 container_of(work, struct ieee80211_local,
744 dynamic_ps_disable_work);
745
746 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
747 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
748 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
749 }
750
751 ieee80211_wake_queues_by_reason(&local->hw,
752 IEEE80211_QUEUE_STOP_REASON_PS);
753 }
754
ieee80211_dynamic_ps_enable_work(struct work_struct * work)755 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
756 {
757 struct ieee80211_local *local =
758 container_of(work, struct ieee80211_local,
759 dynamic_ps_enable_work);
760 struct ieee80211_sub_if_data *sdata = local->ps_sdata;
761 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
762
763 /* can only happen when PS was just disabled anyway */
764 if (!sdata)
765 return;
766
767 if (local->hw.conf.flags & IEEE80211_CONF_PS)
768 return;
769
770 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
771 (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED))) {
772 netif_tx_stop_all_queues(sdata->dev);
773 /*
774 * Flush all the frames queued in the driver before
775 * going to power save
776 */
777 drv_flush(local, false);
778 ieee80211_send_nullfunc(local, sdata, 1);
779
780 /* Flush once again to get the tx status of nullfunc frame */
781 drv_flush(local, false);
782 }
783
784 if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
785 (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
786 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
787 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
788 local->hw.conf.flags |= IEEE80211_CONF_PS;
789 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
790 }
791
792 netif_tx_start_all_queues(sdata->dev);
793 }
794
ieee80211_dynamic_ps_timer(unsigned long data)795 void ieee80211_dynamic_ps_timer(unsigned long data)
796 {
797 struct ieee80211_local *local = (void *) data;
798
799 if (local->quiescing || local->suspended)
800 return;
801
802 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
803 }
804
805 /* MLME */
ieee80211_sta_wmm_params(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata,u8 * wmm_param,size_t wmm_param_len)806 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
807 struct ieee80211_sub_if_data *sdata,
808 u8 *wmm_param, size_t wmm_param_len)
809 {
810 struct ieee80211_tx_queue_params params;
811 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
812 size_t left;
813 int count;
814 u8 *pos, uapsd_queues = 0;
815
816 if (!local->ops->conf_tx)
817 return;
818
819 if (local->hw.queues < 4)
820 return;
821
822 if (!wmm_param)
823 return;
824
825 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
826 return;
827
828 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
829 uapsd_queues = local->uapsd_queues;
830
831 count = wmm_param[6] & 0x0f;
832 if (count == ifmgd->wmm_last_param_set)
833 return;
834 ifmgd->wmm_last_param_set = count;
835
836 pos = wmm_param + 8;
837 left = wmm_param_len - 8;
838
839 memset(¶ms, 0, sizeof(params));
840
841 local->wmm_acm = 0;
842 for (; left >= 4; left -= 4, pos += 4) {
843 int aci = (pos[0] >> 5) & 0x03;
844 int acm = (pos[0] >> 4) & 0x01;
845 bool uapsd = false;
846 int queue;
847
848 switch (aci) {
849 case 1: /* AC_BK */
850 queue = 3;
851 if (acm)
852 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
853 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
854 uapsd = true;
855 break;
856 case 2: /* AC_VI */
857 queue = 1;
858 if (acm)
859 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
860 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
861 uapsd = true;
862 break;
863 case 3: /* AC_VO */
864 queue = 0;
865 if (acm)
866 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
867 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
868 uapsd = true;
869 break;
870 case 0: /* AC_BE */
871 default:
872 queue = 2;
873 if (acm)
874 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
875 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
876 uapsd = true;
877 break;
878 }
879
880 params.aifs = pos[0] & 0x0f;
881 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
882 params.cw_min = ecw2cw(pos[1] & 0x0f);
883 params.txop = get_unaligned_le16(pos + 2);
884 params.uapsd = uapsd;
885
886 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
887 wiphy_debug(local->hw.wiphy,
888 "WMM queue=%d aci=%d acm=%d aifs=%d "
889 "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
890 queue, aci, acm,
891 params.aifs, params.cw_min, params.cw_max,
892 params.txop, params.uapsd);
893 #endif
894 if (drv_conf_tx(local, queue, ¶ms))
895 wiphy_debug(local->hw.wiphy,
896 "failed to set TX queue parameters for queue %d\n",
897 queue);
898 }
899
900 /* enable WMM or activate new settings */
901 sdata->vif.bss_conf.qos = true;
902 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
903 }
904
ieee80211_handle_bss_capability(struct ieee80211_sub_if_data * sdata,u16 capab,bool erp_valid,u8 erp)905 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
906 u16 capab, bool erp_valid, u8 erp)
907 {
908 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
909 u32 changed = 0;
910 bool use_protection;
911 bool use_short_preamble;
912 bool use_short_slot;
913
914 if (erp_valid) {
915 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
916 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
917 } else {
918 use_protection = false;
919 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
920 }
921
922 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
923 if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
924 use_short_slot = true;
925
926 if (use_protection != bss_conf->use_cts_prot) {
927 bss_conf->use_cts_prot = use_protection;
928 changed |= BSS_CHANGED_ERP_CTS_PROT;
929 }
930
931 if (use_short_preamble != bss_conf->use_short_preamble) {
932 bss_conf->use_short_preamble = use_short_preamble;
933 changed |= BSS_CHANGED_ERP_PREAMBLE;
934 }
935
936 if (use_short_slot != bss_conf->use_short_slot) {
937 bss_conf->use_short_slot = use_short_slot;
938 changed |= BSS_CHANGED_ERP_SLOT;
939 }
940
941 return changed;
942 }
943
ieee80211_set_associated(struct ieee80211_sub_if_data * sdata,struct cfg80211_bss * cbss,u32 bss_info_changed)944 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
945 struct cfg80211_bss *cbss,
946 u32 bss_info_changed)
947 {
948 struct ieee80211_bss *bss = (void *)cbss->priv;
949 struct ieee80211_local *local = sdata->local;
950 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
951
952 bss_info_changed |= BSS_CHANGED_ASSOC;
953 /* set timing information */
954 bss_conf->beacon_int = cbss->beacon_interval;
955 bss_conf->timestamp = cbss->tsf;
956
957 bss_info_changed |= BSS_CHANGED_BEACON_INT;
958 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
959 cbss->capability, bss->has_erp_value, bss->erp_value);
960
961 sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
962 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
963
964 sdata->u.mgd.associated = cbss;
965 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
966
967 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
968
969 /* just to be sure */
970 sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
971 IEEE80211_STA_BEACON_POLL);
972
973 ieee80211_led_assoc(local, 1);
974
975 if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
976 bss_conf->dtim_period = bss->dtim_period;
977 else
978 bss_conf->dtim_period = 0;
979
980 bss_conf->assoc = 1;
981 /*
982 * For now just always ask the driver to update the basic rateset
983 * when we have associated, we aren't checking whether it actually
984 * changed or not.
985 */
986 bss_info_changed |= BSS_CHANGED_BASIC_RATES;
987
988 /* And the BSSID changed - we're associated now */
989 bss_info_changed |= BSS_CHANGED_BSSID;
990
991 /* Tell the driver to monitor connection quality (if supported) */
992 if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
993 bss_conf->cqm_rssi_thold)
994 bss_info_changed |= BSS_CHANGED_CQM;
995
996 /* Enable ARP filtering */
997 if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
998 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
999 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1000 }
1001
1002 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1003
1004 mutex_lock(&local->iflist_mtx);
1005 ieee80211_recalc_ps(local, -1);
1006 ieee80211_recalc_smps(local);
1007 mutex_unlock(&local->iflist_mtx);
1008
1009 netif_tx_start_all_queues(sdata->dev);
1010 netif_carrier_on(sdata->dev);
1011 }
1012
ieee80211_set_disassoc(struct ieee80211_sub_if_data * sdata,bool remove_sta,bool tx)1013 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1014 bool remove_sta, bool tx)
1015 {
1016 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1017 struct ieee80211_local *local = sdata->local;
1018 struct sta_info *sta;
1019 u32 changed = 0, config_changed = 0;
1020 u8 bssid[ETH_ALEN];
1021
1022 ASSERT_MGD_MTX(ifmgd);
1023
1024 if (WARN_ON(!ifmgd->associated))
1025 return;
1026
1027 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1028
1029 ifmgd->associated = NULL;
1030 memset(ifmgd->bssid, 0, ETH_ALEN);
1031
1032 /*
1033 * we need to commit the associated = NULL change because the
1034 * scan code uses that to determine whether this iface should
1035 * go to/wake up from powersave or not -- and could otherwise
1036 * wake the queues erroneously.
1037 */
1038 smp_mb();
1039
1040 /*
1041 * Thus, we can only afterwards stop the queues -- to account
1042 * for the case where another CPU is finishing a scan at this
1043 * time -- we don't want the scan code to enable queues.
1044 */
1045
1046 netif_tx_stop_all_queues(sdata->dev);
1047 netif_carrier_off(sdata->dev);
1048
1049 mutex_lock(&local->sta_mtx);
1050 sta = sta_info_get(sdata, bssid);
1051 if (sta) {
1052 set_sta_flags(sta, WLAN_STA_BLOCK_BA);
1053 ieee80211_sta_tear_down_BA_sessions(sta, tx);
1054 }
1055 mutex_unlock(&local->sta_mtx);
1056
1057 changed |= ieee80211_reset_erp_info(sdata);
1058
1059 ieee80211_led_assoc(local, 0);
1060 changed |= BSS_CHANGED_ASSOC;
1061 sdata->vif.bss_conf.assoc = false;
1062
1063 ieee80211_set_wmm_default(sdata);
1064
1065 /* channel(_type) changes are handled by ieee80211_hw_config */
1066 WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
1067
1068 /* on the next assoc, re-program HT parameters */
1069 sdata->ht_opmode_valid = false;
1070
1071 local->power_constr_level = 0;
1072
1073 del_timer_sync(&local->dynamic_ps_timer);
1074 cancel_work_sync(&local->dynamic_ps_enable_work);
1075
1076 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1077 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1078 config_changed |= IEEE80211_CONF_CHANGE_PS;
1079 }
1080
1081 ieee80211_hw_config(local, config_changed);
1082
1083 /* Disable ARP filtering */
1084 if (sdata->vif.bss_conf.arp_filter_enabled) {
1085 sdata->vif.bss_conf.arp_filter_enabled = false;
1086 changed |= BSS_CHANGED_ARP_FILTER;
1087 }
1088
1089 /* The BSSID (not really interesting) and HT changed */
1090 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1091 ieee80211_bss_info_change_notify(sdata, changed);
1092
1093 if (remove_sta)
1094 sta_info_destroy_addr(sdata, bssid);
1095
1096 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1097 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1098 del_timer_sync(&sdata->u.mgd.timer);
1099 del_timer_sync(&sdata->u.mgd.chswitch_timer);
1100 }
1101
ieee80211_sta_rx_notify(struct ieee80211_sub_if_data * sdata,struct ieee80211_hdr * hdr)1102 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1103 struct ieee80211_hdr *hdr)
1104 {
1105 /*
1106 * We can postpone the mgd.timer whenever receiving unicast frames
1107 * from AP because we know that the connection is working both ways
1108 * at that time. But multicast frames (and hence also beacons) must
1109 * be ignored here, because we need to trigger the timer during
1110 * data idle periods for sending the periodic probe request to the
1111 * AP we're connected to.
1112 */
1113 if (is_multicast_ether_addr(hdr->addr1))
1114 return;
1115
1116 ieee80211_sta_reset_conn_monitor(sdata);
1117 }
1118
ieee80211_reset_ap_probe(struct ieee80211_sub_if_data * sdata)1119 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1120 {
1121 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1122
1123 if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1124 IEEE80211_STA_CONNECTION_POLL)))
1125 return;
1126
1127 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1128 IEEE80211_STA_BEACON_POLL);
1129 mutex_lock(&sdata->local->iflist_mtx);
1130 ieee80211_recalc_ps(sdata->local, -1);
1131 mutex_unlock(&sdata->local->iflist_mtx);
1132
1133 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1134 return;
1135
1136 /*
1137 * We've received a probe response, but are not sure whether
1138 * we have or will be receiving any beacons or data, so let's
1139 * schedule the timers again, just in case.
1140 */
1141 ieee80211_sta_reset_beacon_monitor(sdata);
1142
1143 mod_timer(&ifmgd->conn_mon_timer,
1144 round_jiffies_up(jiffies +
1145 IEEE80211_CONNECTION_IDLE_TIME));
1146 }
1147
ieee80211_sta_tx_notify(struct ieee80211_sub_if_data * sdata,struct ieee80211_hdr * hdr,bool ack)1148 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1149 struct ieee80211_hdr *hdr, bool ack)
1150 {
1151 if (!ieee80211_is_data(hdr->frame_control))
1152 return;
1153
1154 if (ack)
1155 ieee80211_sta_reset_conn_monitor(sdata);
1156
1157 if (ieee80211_is_nullfunc(hdr->frame_control) &&
1158 sdata->u.mgd.probe_send_count > 0) {
1159 if (ack)
1160 sdata->u.mgd.probe_send_count = 0;
1161 else
1162 sdata->u.mgd.nullfunc_failed = true;
1163 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1164 }
1165 }
1166
ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data * sdata)1167 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1168 {
1169 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1170 const u8 *ssid;
1171 u8 *dst = ifmgd->associated->bssid;
1172 u8 unicast_limit = max(1, max_probe_tries - 3);
1173
1174 /*
1175 * Try sending broadcast probe requests for the last three
1176 * probe requests after the first ones failed since some
1177 * buggy APs only support broadcast probe requests.
1178 */
1179 if (ifmgd->probe_send_count >= unicast_limit)
1180 dst = NULL;
1181
1182 /*
1183 * When the hardware reports an accurate Tx ACK status, it's
1184 * better to send a nullfunc frame instead of a probe request,
1185 * as it will kick us off the AP quickly if we aren't associated
1186 * anymore. The timeout will be reset if the frame is ACKed by
1187 * the AP.
1188 */
1189 if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1190 ifmgd->nullfunc_failed = false;
1191 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1192 } else {
1193 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1194 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid[1], NULL, 0);
1195 }
1196
1197 ifmgd->probe_send_count++;
1198 ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1199 run_again(ifmgd, ifmgd->probe_timeout);
1200 }
1201
ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data * sdata,bool beacon)1202 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1203 bool beacon)
1204 {
1205 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1206 bool already = false;
1207
1208 if (!ieee80211_sdata_running(sdata))
1209 return;
1210
1211 if (sdata->local->scanning)
1212 return;
1213
1214 if (sdata->local->tmp_channel)
1215 return;
1216
1217 mutex_lock(&ifmgd->mtx);
1218
1219 if (!ifmgd->associated)
1220 goto out;
1221
1222 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1223 if (beacon && net_ratelimit())
1224 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1225 "- sending probe request\n", sdata->name);
1226 #endif
1227
1228 /*
1229 * The driver/our work has already reported this event or the
1230 * connection monitoring has kicked in and we have already sent
1231 * a probe request. Or maybe the AP died and the driver keeps
1232 * reporting until we disassociate...
1233 *
1234 * In either case we have to ignore the current call to this
1235 * function (except for setting the correct probe reason bit)
1236 * because otherwise we would reset the timer every time and
1237 * never check whether we received a probe response!
1238 */
1239 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1240 IEEE80211_STA_CONNECTION_POLL))
1241 already = true;
1242
1243 if (beacon)
1244 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1245 else
1246 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1247
1248 if (already)
1249 goto out;
1250
1251 mutex_lock(&sdata->local->iflist_mtx);
1252 ieee80211_recalc_ps(sdata->local, -1);
1253 mutex_unlock(&sdata->local->iflist_mtx);
1254
1255 ifmgd->probe_send_count = 0;
1256 ieee80211_mgd_probe_ap_send(sdata);
1257 out:
1258 mutex_unlock(&ifmgd->mtx);
1259 }
1260
ieee80211_ap_probereq_get(struct ieee80211_hw * hw,struct ieee80211_vif * vif)1261 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1262 struct ieee80211_vif *vif)
1263 {
1264 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1265 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1266 struct sk_buff *skb;
1267 const u8 *ssid;
1268
1269 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1270 return NULL;
1271
1272 ASSERT_MGD_MTX(ifmgd);
1273
1274 if (!ifmgd->associated)
1275 return NULL;
1276
1277 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1278 skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid,
1279 ssid + 2, ssid[1], NULL, 0);
1280
1281 return skb;
1282 }
1283 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1284
__ieee80211_connection_loss(struct ieee80211_sub_if_data * sdata)1285 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1286 {
1287 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1288 struct ieee80211_local *local = sdata->local;
1289 u8 bssid[ETH_ALEN];
1290
1291 mutex_lock(&ifmgd->mtx);
1292 if (!ifmgd->associated) {
1293 mutex_unlock(&ifmgd->mtx);
1294 return;
1295 }
1296
1297 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1298
1299 printk(KERN_DEBUG "%s: Connection to AP %pM lost.\n",
1300 sdata->name, bssid);
1301
1302 ieee80211_set_disassoc(sdata, true, true);
1303 mutex_unlock(&ifmgd->mtx);
1304
1305 mutex_lock(&local->mtx);
1306 ieee80211_recalc_idle(local);
1307 mutex_unlock(&local->mtx);
1308 /*
1309 * must be outside lock due to cfg80211,
1310 * but that's not a problem.
1311 */
1312 ieee80211_send_deauth_disassoc(sdata, bssid,
1313 IEEE80211_STYPE_DEAUTH,
1314 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1315 NULL, true);
1316 }
1317
ieee80211_beacon_connection_loss_work(struct work_struct * work)1318 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1319 {
1320 struct ieee80211_sub_if_data *sdata =
1321 container_of(work, struct ieee80211_sub_if_data,
1322 u.mgd.beacon_connection_loss_work);
1323
1324 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1325 __ieee80211_connection_loss(sdata);
1326 else
1327 ieee80211_mgd_probe_ap(sdata, true);
1328 }
1329
ieee80211_beacon_loss(struct ieee80211_vif * vif)1330 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1331 {
1332 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1333 struct ieee80211_hw *hw = &sdata->local->hw;
1334
1335 trace_api_beacon_loss(sdata);
1336
1337 WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1338 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1339 }
1340 EXPORT_SYMBOL(ieee80211_beacon_loss);
1341
ieee80211_connection_loss(struct ieee80211_vif * vif)1342 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1343 {
1344 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1345 struct ieee80211_hw *hw = &sdata->local->hw;
1346
1347 trace_api_connection_loss(sdata);
1348
1349 WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1350 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1351 }
1352 EXPORT_SYMBOL(ieee80211_connection_loss);
1353
1354
1355 static enum rx_mgmt_action __must_check
ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len)1356 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1357 struct ieee80211_mgmt *mgmt, size_t len)
1358 {
1359 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1360 const u8 *bssid = NULL;
1361 u16 reason_code;
1362
1363 if (len < 24 + 2)
1364 return RX_MGMT_NONE;
1365
1366 ASSERT_MGD_MTX(ifmgd);
1367
1368 bssid = ifmgd->associated->bssid;
1369
1370 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1371
1372 printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1373 sdata->name, bssid, reason_code);
1374
1375 ieee80211_set_disassoc(sdata, true, false);
1376 mutex_lock(&sdata->local->mtx);
1377 ieee80211_recalc_idle(sdata->local);
1378 mutex_unlock(&sdata->local->mtx);
1379
1380 return RX_MGMT_CFG80211_DEAUTH;
1381 }
1382
1383
1384 static enum rx_mgmt_action __must_check
ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len)1385 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1386 struct ieee80211_mgmt *mgmt, size_t len)
1387 {
1388 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1389 u16 reason_code;
1390
1391 if (len < 24 + 2)
1392 return RX_MGMT_NONE;
1393
1394 ASSERT_MGD_MTX(ifmgd);
1395
1396 if (WARN_ON(!ifmgd->associated))
1397 return RX_MGMT_NONE;
1398
1399 if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1400 return RX_MGMT_NONE;
1401
1402 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1403
1404 printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1405 sdata->name, mgmt->sa, reason_code);
1406
1407 ieee80211_set_disassoc(sdata, true, false);
1408 mutex_lock(&sdata->local->mtx);
1409 ieee80211_recalc_idle(sdata->local);
1410 mutex_unlock(&sdata->local->mtx);
1411 return RX_MGMT_CFG80211_DISASSOC;
1412 }
1413
1414
ieee80211_assoc_success(struct ieee80211_work * wk,struct ieee80211_mgmt * mgmt,size_t len)1415 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1416 struct ieee80211_mgmt *mgmt, size_t len)
1417 {
1418 struct ieee80211_sub_if_data *sdata = wk->sdata;
1419 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1420 struct ieee80211_local *local = sdata->local;
1421 struct ieee80211_supported_band *sband;
1422 struct sta_info *sta;
1423 struct cfg80211_bss *cbss = wk->assoc.bss;
1424 u8 *pos;
1425 u32 rates, basic_rates;
1426 u16 capab_info, aid;
1427 struct ieee802_11_elems elems;
1428 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1429 u32 changed = 0;
1430 int i, j, err;
1431 bool have_higher_than_11mbit = false;
1432 u16 ap_ht_cap_flags;
1433
1434 /* AssocResp and ReassocResp have identical structure */
1435
1436 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1437 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1438
1439 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1440 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1441 "set\n", sdata->name, aid);
1442 aid &= ~(BIT(15) | BIT(14));
1443
1444 pos = mgmt->u.assoc_resp.variable;
1445 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1446
1447 if (!elems.supp_rates) {
1448 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1449 sdata->name);
1450 return false;
1451 }
1452
1453 ifmgd->aid = aid;
1454
1455 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1456 if (!sta) {
1457 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1458 " the AP\n", sdata->name);
1459 return false;
1460 }
1461
1462 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1463 WLAN_STA_ASSOC_AP);
1464 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1465 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1466
1467 rates = 0;
1468 basic_rates = 0;
1469 sband = local->hw.wiphy->bands[wk->chan->band];
1470
1471 for (i = 0; i < elems.supp_rates_len; i++) {
1472 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1473 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1474
1475 if (rate > 110)
1476 have_higher_than_11mbit = true;
1477
1478 for (j = 0; j < sband->n_bitrates; j++) {
1479 if (sband->bitrates[j].bitrate == rate) {
1480 rates |= BIT(j);
1481 if (is_basic)
1482 basic_rates |= BIT(j);
1483 break;
1484 }
1485 }
1486 }
1487
1488 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1489 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1490 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1491
1492 if (rate > 110)
1493 have_higher_than_11mbit = true;
1494
1495 for (j = 0; j < sband->n_bitrates; j++) {
1496 if (sband->bitrates[j].bitrate == rate) {
1497 rates |= BIT(j);
1498 if (is_basic)
1499 basic_rates |= BIT(j);
1500 break;
1501 }
1502 }
1503 }
1504
1505 sta->sta.supp_rates[wk->chan->band] = rates;
1506 sdata->vif.bss_conf.basic_rates = basic_rates;
1507
1508 /* cf. IEEE 802.11 9.2.12 */
1509 if (wk->chan->band == IEEE80211_BAND_2GHZ &&
1510 have_higher_than_11mbit)
1511 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1512 else
1513 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1514
1515 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1516 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1517 elems.ht_cap_elem, &sta->sta.ht_cap);
1518
1519 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1520
1521 rate_control_rate_init(sta);
1522
1523 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1524 set_sta_flags(sta, WLAN_STA_MFP);
1525
1526 if (elems.wmm_param)
1527 set_sta_flags(sta, WLAN_STA_WME);
1528
1529 err = sta_info_insert(sta);
1530 sta = NULL;
1531 if (err) {
1532 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1533 " the AP (error %d)\n", sdata->name, err);
1534 return false;
1535 }
1536
1537 /*
1538 * Always handle WMM once after association regardless
1539 * of the first value the AP uses. Setting -1 here has
1540 * that effect because the AP values is an unsigned
1541 * 4-bit value.
1542 */
1543 ifmgd->wmm_last_param_set = -1;
1544
1545 if (elems.wmm_param)
1546 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1547 elems.wmm_param_len);
1548 else
1549 ieee80211_set_wmm_default(sdata);
1550
1551 local->oper_channel = wk->chan;
1552
1553 if (elems.ht_info_elem && elems.wmm_param &&
1554 (sdata->local->hw.queues >= 4) &&
1555 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1556 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1557 cbss->bssid, ap_ht_cap_flags);
1558
1559 /* set AID and assoc capability,
1560 * ieee80211_set_associated() will tell the driver */
1561 bss_conf->aid = aid;
1562 bss_conf->assoc_capability = capab_info;
1563 ieee80211_set_associated(sdata, cbss, changed);
1564
1565 /*
1566 * If we're using 4-addr mode, let the AP know that we're
1567 * doing so, so that it can create the STA VLAN on its side
1568 */
1569 if (ifmgd->use_4addr)
1570 ieee80211_send_4addr_nullfunc(local, sdata);
1571
1572 /*
1573 * Start timer to probe the connection to the AP now.
1574 * Also start the timer that will detect beacon loss.
1575 */
1576 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1577 ieee80211_sta_reset_beacon_monitor(sdata);
1578
1579 return true;
1580 }
1581
1582
ieee80211_rx_bss_info(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len,struct ieee80211_rx_status * rx_status,struct ieee802_11_elems * elems,bool beacon)1583 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1584 struct ieee80211_mgmt *mgmt,
1585 size_t len,
1586 struct ieee80211_rx_status *rx_status,
1587 struct ieee802_11_elems *elems,
1588 bool beacon)
1589 {
1590 struct ieee80211_local *local = sdata->local;
1591 int freq;
1592 struct ieee80211_bss *bss;
1593 struct ieee80211_channel *channel;
1594 bool need_ps = false;
1595
1596 if (sdata->u.mgd.associated) {
1597 bss = (void *)sdata->u.mgd.associated->priv;
1598 /* not previously set so we may need to recalc */
1599 need_ps = !bss->dtim_period;
1600 }
1601
1602 if (elems->ds_params && elems->ds_params_len == 1)
1603 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
1604 rx_status->band);
1605 else
1606 freq = rx_status->freq;
1607
1608 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1609
1610 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1611 return;
1612
1613 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1614 channel, beacon);
1615 if (bss)
1616 ieee80211_rx_bss_put(local, bss);
1617
1618 if (!sdata->u.mgd.associated)
1619 return;
1620
1621 if (need_ps) {
1622 mutex_lock(&local->iflist_mtx);
1623 ieee80211_recalc_ps(local, -1);
1624 mutex_unlock(&local->iflist_mtx);
1625 }
1626
1627 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1628 (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1629 ETH_ALEN) == 0)) {
1630 struct ieee80211_channel_sw_ie *sw_elem =
1631 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1632 ieee80211_sta_process_chanswitch(sdata, sw_elem,
1633 bss, rx_status->mactime);
1634 }
1635 }
1636
1637
ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1638 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1639 struct sk_buff *skb)
1640 {
1641 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1642 struct ieee80211_if_managed *ifmgd;
1643 struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1644 size_t baselen, len = skb->len;
1645 struct ieee802_11_elems elems;
1646
1647 ifmgd = &sdata->u.mgd;
1648
1649 ASSERT_MGD_MTX(ifmgd);
1650
1651 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1652 return; /* ignore ProbeResp to foreign address */
1653
1654 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1655 if (baselen > len)
1656 return;
1657
1658 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1659 &elems);
1660
1661 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1662
1663 if (ifmgd->associated &&
1664 memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0)
1665 ieee80211_reset_ap_probe(sdata);
1666 }
1667
1668 /*
1669 * This is the canonical list of information elements we care about,
1670 * the filter code also gives us all changes to the Microsoft OUI
1671 * (00:50:F2) vendor IE which is used for WMM which we need to track.
1672 *
1673 * We implement beacon filtering in software since that means we can
1674 * avoid processing the frame here and in cfg80211, and userspace
1675 * will not be able to tell whether the hardware supports it or not.
1676 *
1677 * XXX: This list needs to be dynamic -- userspace needs to be able to
1678 * add items it requires. It also needs to be able to tell us to
1679 * look out for other vendor IEs.
1680 */
1681 static const u64 care_about_ies =
1682 (1ULL << WLAN_EID_COUNTRY) |
1683 (1ULL << WLAN_EID_ERP_INFO) |
1684 (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1685 (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1686 (1ULL << WLAN_EID_HT_CAPABILITY) |
1687 (1ULL << WLAN_EID_HT_INFORMATION);
1688
ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len,struct ieee80211_rx_status * rx_status)1689 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1690 struct ieee80211_mgmt *mgmt,
1691 size_t len,
1692 struct ieee80211_rx_status *rx_status)
1693 {
1694 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1695 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1696 size_t baselen;
1697 struct ieee802_11_elems elems;
1698 struct ieee80211_local *local = sdata->local;
1699 u32 changed = 0;
1700 bool erp_valid, directed_tim = false;
1701 u8 erp_value = 0;
1702 u32 ncrc;
1703 u8 *bssid;
1704
1705 ASSERT_MGD_MTX(ifmgd);
1706
1707 /* Process beacon from the current BSS */
1708 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1709 if (baselen > len)
1710 return;
1711
1712 if (rx_status->freq != local->hw.conf.channel->center_freq)
1713 return;
1714
1715 /*
1716 * We might have received a number of frames, among them a
1717 * disassoc frame and a beacon...
1718 */
1719 if (!ifmgd->associated)
1720 return;
1721
1722 bssid = ifmgd->associated->bssid;
1723
1724 /*
1725 * And in theory even frames from a different AP we were just
1726 * associated to a split-second ago!
1727 */
1728 if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1729 return;
1730
1731 /* Track average RSSI from the Beacon frames of the current AP */
1732 ifmgd->last_beacon_signal = rx_status->signal;
1733 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1734 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1735 ifmgd->ave_beacon_signal = rx_status->signal * 16;
1736 ifmgd->last_cqm_event_signal = 0;
1737 ifmgd->count_beacon_signal = 1;
1738 } else {
1739 ifmgd->ave_beacon_signal =
1740 (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1741 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1742 ifmgd->ave_beacon_signal) / 16;
1743 ifmgd->count_beacon_signal++;
1744 }
1745 if (bss_conf->cqm_rssi_thold &&
1746 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
1747 !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1748 int sig = ifmgd->ave_beacon_signal / 16;
1749 int last_event = ifmgd->last_cqm_event_signal;
1750 int thold = bss_conf->cqm_rssi_thold;
1751 int hyst = bss_conf->cqm_rssi_hyst;
1752 if (sig < thold &&
1753 (last_event == 0 || sig < last_event - hyst)) {
1754 ifmgd->last_cqm_event_signal = sig;
1755 ieee80211_cqm_rssi_notify(
1756 &sdata->vif,
1757 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1758 GFP_KERNEL);
1759 } else if (sig > thold &&
1760 (last_event == 0 || sig > last_event + hyst)) {
1761 ifmgd->last_cqm_event_signal = sig;
1762 ieee80211_cqm_rssi_notify(
1763 &sdata->vif,
1764 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1765 GFP_KERNEL);
1766 }
1767 }
1768
1769 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1770 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1771 if (net_ratelimit()) {
1772 printk(KERN_DEBUG "%s: cancelling probereq poll due "
1773 "to a received beacon\n", sdata->name);
1774 }
1775 #endif
1776 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1777 mutex_lock(&local->iflist_mtx);
1778 ieee80211_recalc_ps(local, -1);
1779 mutex_unlock(&local->iflist_mtx);
1780 }
1781
1782 /*
1783 * Push the beacon loss detection into the future since
1784 * we are processing a beacon from the AP just now.
1785 */
1786 ieee80211_sta_reset_beacon_monitor(sdata);
1787
1788 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1789 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1790 len - baselen, &elems,
1791 care_about_ies, ncrc);
1792
1793 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1794 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1795 ifmgd->aid);
1796
1797 if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) {
1798 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1799 true);
1800
1801 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1802 elems.wmm_param_len);
1803 }
1804
1805 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1806 if (directed_tim) {
1807 if (local->hw.conf.dynamic_ps_timeout > 0) {
1808 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1809 ieee80211_hw_config(local,
1810 IEEE80211_CONF_CHANGE_PS);
1811 ieee80211_send_nullfunc(local, sdata, 0);
1812 } else {
1813 local->pspolling = true;
1814
1815 /*
1816 * Here is assumed that the driver will be
1817 * able to send ps-poll frame and receive a
1818 * response even though power save mode is
1819 * enabled, but some drivers might require
1820 * to disable power save here. This needs
1821 * to be investigated.
1822 */
1823 ieee80211_send_pspoll(local, sdata);
1824 }
1825 }
1826 }
1827
1828 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
1829 return;
1830 ifmgd->beacon_crc = ncrc;
1831 ifmgd->beacon_crc_valid = true;
1832
1833 if (elems.erp_info && elems.erp_info_len >= 1) {
1834 erp_valid = true;
1835 erp_value = elems.erp_info[0];
1836 } else {
1837 erp_valid = false;
1838 }
1839 changed |= ieee80211_handle_bss_capability(sdata,
1840 le16_to_cpu(mgmt->u.beacon.capab_info),
1841 erp_valid, erp_value);
1842
1843
1844 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1845 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1846 struct sta_info *sta;
1847 struct ieee80211_supported_band *sband;
1848 u16 ap_ht_cap_flags;
1849
1850 rcu_read_lock();
1851
1852 sta = sta_info_get(sdata, bssid);
1853 if (WARN_ON(!sta)) {
1854 rcu_read_unlock();
1855 return;
1856 }
1857
1858 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1859
1860 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1861 elems.ht_cap_elem, &sta->sta.ht_cap);
1862
1863 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1864
1865 rcu_read_unlock();
1866
1867 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1868 bssid, ap_ht_cap_flags);
1869 }
1870
1871 /* Note: country IE parsing is done for us by cfg80211 */
1872 if (elems.country_elem) {
1873 /* TODO: IBSS also needs this */
1874 if (elems.pwr_constr_elem)
1875 ieee80211_handle_pwr_constr(sdata,
1876 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1877 elems.pwr_constr_elem,
1878 elems.pwr_constr_elem_len);
1879 }
1880
1881 ieee80211_bss_info_change_notify(sdata, changed);
1882 }
1883
ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1884 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1885 struct sk_buff *skb)
1886 {
1887 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1888 struct ieee80211_rx_status *rx_status;
1889 struct ieee80211_mgmt *mgmt;
1890 enum rx_mgmt_action rma = RX_MGMT_NONE;
1891 u16 fc;
1892
1893 rx_status = (struct ieee80211_rx_status *) skb->cb;
1894 mgmt = (struct ieee80211_mgmt *) skb->data;
1895 fc = le16_to_cpu(mgmt->frame_control);
1896
1897 mutex_lock(&ifmgd->mtx);
1898
1899 if (ifmgd->associated &&
1900 memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1901 switch (fc & IEEE80211_FCTL_STYPE) {
1902 case IEEE80211_STYPE_BEACON:
1903 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1904 rx_status);
1905 break;
1906 case IEEE80211_STYPE_PROBE_RESP:
1907 ieee80211_rx_mgmt_probe_resp(sdata, skb);
1908 break;
1909 case IEEE80211_STYPE_DEAUTH:
1910 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1911 break;
1912 case IEEE80211_STYPE_DISASSOC:
1913 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1914 break;
1915 case IEEE80211_STYPE_ACTION:
1916 switch (mgmt->u.action.category) {
1917 case WLAN_CATEGORY_SPECTRUM_MGMT:
1918 ieee80211_sta_process_chanswitch(sdata,
1919 &mgmt->u.action.u.chan_switch.sw_elem,
1920 (void *)ifmgd->associated->priv,
1921 rx_status->mactime);
1922 break;
1923 }
1924 }
1925 mutex_unlock(&ifmgd->mtx);
1926
1927 switch (rma) {
1928 case RX_MGMT_NONE:
1929 /* no action */
1930 break;
1931 case RX_MGMT_CFG80211_DEAUTH:
1932 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1933 break;
1934 case RX_MGMT_CFG80211_DISASSOC:
1935 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1936 break;
1937 default:
1938 WARN(1, "unexpected: %d", rma);
1939 }
1940 return;
1941 }
1942
1943 mutex_unlock(&ifmgd->mtx);
1944
1945 if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1946 (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) {
1947 struct ieee80211_local *local = sdata->local;
1948 struct ieee80211_work *wk;
1949
1950 mutex_lock(&local->mtx);
1951 list_for_each_entry(wk, &local->work_list, list) {
1952 if (wk->sdata != sdata)
1953 continue;
1954
1955 if (wk->type != IEEE80211_WORK_ASSOC &&
1956 wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
1957 continue;
1958
1959 if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN))
1960 continue;
1961 if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN))
1962 continue;
1963
1964 /*
1965 * Printing the message only here means we can't
1966 * spuriously print it, but it also means that it
1967 * won't be printed when the frame comes in before
1968 * we even tried to associate or in similar cases.
1969 *
1970 * Ultimately, I suspect cfg80211 should print the
1971 * messages instead.
1972 */
1973 printk(KERN_DEBUG
1974 "%s: deauthenticated from %pM (Reason: %u)\n",
1975 sdata->name, mgmt->bssid,
1976 le16_to_cpu(mgmt->u.deauth.reason_code));
1977
1978 list_del_rcu(&wk->list);
1979 free_work(wk);
1980 break;
1981 }
1982 mutex_unlock(&local->mtx);
1983
1984 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1985 }
1986 }
1987
ieee80211_sta_timer(unsigned long data)1988 static void ieee80211_sta_timer(unsigned long data)
1989 {
1990 struct ieee80211_sub_if_data *sdata =
1991 (struct ieee80211_sub_if_data *) data;
1992 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1993 struct ieee80211_local *local = sdata->local;
1994
1995 if (local->quiescing) {
1996 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1997 return;
1998 }
1999
2000 ieee80211_queue_work(&local->hw, &sdata->work);
2001 }
2002
ieee80211_sta_connection_lost(struct ieee80211_sub_if_data * sdata,u8 * bssid)2003 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2004 u8 *bssid)
2005 {
2006 struct ieee80211_local *local = sdata->local;
2007 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2008
2009 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
2010 IEEE80211_STA_BEACON_POLL);
2011
2012 ieee80211_set_disassoc(sdata, true, true);
2013 mutex_unlock(&ifmgd->mtx);
2014 mutex_lock(&local->mtx);
2015 ieee80211_recalc_idle(local);
2016 mutex_unlock(&local->mtx);
2017 /*
2018 * must be outside lock due to cfg80211,
2019 * but that's not a problem.
2020 */
2021 ieee80211_send_deauth_disassoc(sdata, bssid,
2022 IEEE80211_STYPE_DEAUTH,
2023 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2024 NULL, true);
2025 mutex_lock(&ifmgd->mtx);
2026 }
2027
ieee80211_sta_work(struct ieee80211_sub_if_data * sdata)2028 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2029 {
2030 struct ieee80211_local *local = sdata->local;
2031 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2032
2033 /* then process the rest of the work */
2034 mutex_lock(&ifmgd->mtx);
2035
2036 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2037 IEEE80211_STA_CONNECTION_POLL) &&
2038 ifmgd->associated) {
2039 u8 bssid[ETH_ALEN];
2040 int max_tries;
2041
2042 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2043
2044 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2045 max_tries = max_nullfunc_tries;
2046 else
2047 max_tries = max_probe_tries;
2048
2049 /* ACK received for nullfunc probing frame */
2050 if (!ifmgd->probe_send_count)
2051 ieee80211_reset_ap_probe(sdata);
2052 else if (ifmgd->nullfunc_failed) {
2053 if (ifmgd->probe_send_count < max_tries) {
2054 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2055 wiphy_debug(local->hw.wiphy,
2056 "%s: No ack for nullfunc frame to"
2057 " AP %pM, try %d/%i\n",
2058 sdata->name, bssid,
2059 ifmgd->probe_send_count, max_tries);
2060 #endif
2061 ieee80211_mgd_probe_ap_send(sdata);
2062 } else {
2063 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2064 wiphy_debug(local->hw.wiphy,
2065 "%s: No ack for nullfunc frame to"
2066 " AP %pM, disconnecting.\n",
2067 sdata->name, bssid);
2068 #endif
2069 ieee80211_sta_connection_lost(sdata, bssid);
2070 }
2071 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
2072 run_again(ifmgd, ifmgd->probe_timeout);
2073 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2074 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2075 wiphy_debug(local->hw.wiphy,
2076 "%s: Failed to send nullfunc to AP %pM"
2077 " after %dms, disconnecting.\n",
2078 sdata->name,
2079 bssid, probe_wait_ms);
2080 #endif
2081 ieee80211_sta_connection_lost(sdata, bssid);
2082 } else if (ifmgd->probe_send_count < max_tries) {
2083 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2084 wiphy_debug(local->hw.wiphy,
2085 "%s: No probe response from AP %pM"
2086 " after %dms, try %d/%i\n",
2087 sdata->name,
2088 bssid, probe_wait_ms,
2089 ifmgd->probe_send_count, max_tries);
2090 #endif
2091 ieee80211_mgd_probe_ap_send(sdata);
2092 } else {
2093 /*
2094 * We actually lost the connection ... or did we?
2095 * Let's make sure!
2096 */
2097 wiphy_debug(local->hw.wiphy,
2098 "%s: No probe response from AP %pM"
2099 " after %dms, disconnecting.\n",
2100 sdata->name,
2101 bssid, probe_wait_ms);
2102
2103 ieee80211_sta_connection_lost(sdata, bssid);
2104 }
2105 }
2106
2107 mutex_unlock(&ifmgd->mtx);
2108 }
2109
ieee80211_sta_bcn_mon_timer(unsigned long data)2110 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2111 {
2112 struct ieee80211_sub_if_data *sdata =
2113 (struct ieee80211_sub_if_data *) data;
2114 struct ieee80211_local *local = sdata->local;
2115
2116 if (local->quiescing)
2117 return;
2118
2119 ieee80211_queue_work(&sdata->local->hw,
2120 &sdata->u.mgd.beacon_connection_loss_work);
2121 }
2122
ieee80211_sta_conn_mon_timer(unsigned long data)2123 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2124 {
2125 struct ieee80211_sub_if_data *sdata =
2126 (struct ieee80211_sub_if_data *) data;
2127 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2128 struct ieee80211_local *local = sdata->local;
2129
2130 if (local->quiescing)
2131 return;
2132
2133 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2134 }
2135
ieee80211_sta_monitor_work(struct work_struct * work)2136 static void ieee80211_sta_monitor_work(struct work_struct *work)
2137 {
2138 struct ieee80211_sub_if_data *sdata =
2139 container_of(work, struct ieee80211_sub_if_data,
2140 u.mgd.monitor_work);
2141
2142 ieee80211_mgd_probe_ap(sdata, false);
2143 }
2144
ieee80211_restart_sta_timer(struct ieee80211_sub_if_data * sdata)2145 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2146 {
2147 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2148 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
2149 IEEE80211_STA_CONNECTION_POLL);
2150
2151 /* let's probe the connection once */
2152 ieee80211_queue_work(&sdata->local->hw,
2153 &sdata->u.mgd.monitor_work);
2154 /* and do all the other regular work too */
2155 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2156 }
2157 }
2158
2159 #ifdef CONFIG_PM
ieee80211_sta_quiesce(struct ieee80211_sub_if_data * sdata)2160 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2161 {
2162 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2163
2164 /*
2165 * we need to use atomic bitops for the running bits
2166 * only because both timers might fire at the same
2167 * time -- the code here is properly synchronised.
2168 */
2169
2170 cancel_work_sync(&ifmgd->request_smps_work);
2171
2172 cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2173 if (del_timer_sync(&ifmgd->timer))
2174 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2175
2176 cancel_work_sync(&ifmgd->chswitch_work);
2177 if (del_timer_sync(&ifmgd->chswitch_timer))
2178 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2179
2180 cancel_work_sync(&ifmgd->monitor_work);
2181 /* these will just be re-established on connection */
2182 del_timer_sync(&ifmgd->conn_mon_timer);
2183 del_timer_sync(&ifmgd->bcn_mon_timer);
2184 }
2185
ieee80211_sta_restart(struct ieee80211_sub_if_data * sdata)2186 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2187 {
2188 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2189
2190 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2191 add_timer(&ifmgd->timer);
2192 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2193 add_timer(&ifmgd->chswitch_timer);
2194 ieee80211_sta_reset_beacon_monitor(sdata);
2195 ieee80211_restart_sta_timer(sdata);
2196 }
2197 #endif
2198
2199 /* interface setup */
ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data * sdata)2200 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2201 {
2202 struct ieee80211_if_managed *ifmgd;
2203
2204 ifmgd = &sdata->u.mgd;
2205 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2206 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2207 INIT_WORK(&ifmgd->beacon_connection_loss_work,
2208 ieee80211_beacon_connection_loss_work);
2209 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
2210 setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2211 (unsigned long) sdata);
2212 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2213 (unsigned long) sdata);
2214 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2215 (unsigned long) sdata);
2216 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2217 (unsigned long) sdata);
2218
2219 ifmgd->flags = 0;
2220
2221 mutex_init(&ifmgd->mtx);
2222
2223 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
2224 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
2225 else
2226 ifmgd->req_smps = IEEE80211_SMPS_OFF;
2227 }
2228
2229 /* scan finished notification */
ieee80211_mlme_notify_scan_completed(struct ieee80211_local * local)2230 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2231 {
2232 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2233
2234 /* Restart STA timers */
2235 rcu_read_lock();
2236 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2237 ieee80211_restart_sta_timer(sdata);
2238 rcu_read_unlock();
2239 }
2240
ieee80211_max_network_latency(struct notifier_block * nb,unsigned long data,void * dummy)2241 int ieee80211_max_network_latency(struct notifier_block *nb,
2242 unsigned long data, void *dummy)
2243 {
2244 s32 latency_usec = (s32) data;
2245 struct ieee80211_local *local =
2246 container_of(nb, struct ieee80211_local,
2247 network_latency_notifier);
2248
2249 mutex_lock(&local->iflist_mtx);
2250 ieee80211_recalc_ps(local, latency_usec);
2251 mutex_unlock(&local->iflist_mtx);
2252
2253 return 0;
2254 }
2255
2256 /* config hooks */
2257 static enum work_done_result
ieee80211_probe_auth_done(struct ieee80211_work * wk,struct sk_buff * skb)2258 ieee80211_probe_auth_done(struct ieee80211_work *wk,
2259 struct sk_buff *skb)
2260 {
2261 if (!skb) {
2262 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
2263 return WORK_DONE_DESTROY;
2264 }
2265
2266 if (wk->type == IEEE80211_WORK_AUTH) {
2267 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
2268 return WORK_DONE_DESTROY;
2269 }
2270
2271 mutex_lock(&wk->sdata->u.mgd.mtx);
2272 ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
2273 mutex_unlock(&wk->sdata->u.mgd.mtx);
2274
2275 wk->type = IEEE80211_WORK_AUTH;
2276 wk->probe_auth.tries = 0;
2277 return WORK_DONE_REQUEUE;
2278 }
2279
ieee80211_mgd_auth(struct ieee80211_sub_if_data * sdata,struct cfg80211_auth_request * req)2280 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2281 struct cfg80211_auth_request *req)
2282 {
2283 const u8 *ssid;
2284 struct ieee80211_work *wk;
2285 u16 auth_alg;
2286
2287 if (req->local_state_change)
2288 return 0; /* no need to update mac80211 state */
2289
2290 switch (req->auth_type) {
2291 case NL80211_AUTHTYPE_OPEN_SYSTEM:
2292 auth_alg = WLAN_AUTH_OPEN;
2293 break;
2294 case NL80211_AUTHTYPE_SHARED_KEY:
2295 if (IS_ERR(sdata->local->wep_tx_tfm))
2296 return -EOPNOTSUPP;
2297 auth_alg = WLAN_AUTH_SHARED_KEY;
2298 break;
2299 case NL80211_AUTHTYPE_FT:
2300 auth_alg = WLAN_AUTH_FT;
2301 break;
2302 case NL80211_AUTHTYPE_NETWORK_EAP:
2303 auth_alg = WLAN_AUTH_LEAP;
2304 break;
2305 default:
2306 return -EOPNOTSUPP;
2307 }
2308
2309 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2310 if (!wk)
2311 return -ENOMEM;
2312
2313 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2314
2315 if (req->ie && req->ie_len) {
2316 memcpy(wk->ie, req->ie, req->ie_len);
2317 wk->ie_len = req->ie_len;
2318 }
2319
2320 if (req->key && req->key_len) {
2321 wk->probe_auth.key_len = req->key_len;
2322 wk->probe_auth.key_idx = req->key_idx;
2323 memcpy(wk->probe_auth.key, req->key, req->key_len);
2324 }
2325
2326 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2327 memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
2328 wk->probe_auth.ssid_len = ssid[1];
2329
2330 wk->probe_auth.algorithm = auth_alg;
2331 wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
2332
2333 /* if we already have a probe, don't probe again */
2334 if (req->bss->proberesp_ies)
2335 wk->type = IEEE80211_WORK_AUTH;
2336 else
2337 wk->type = IEEE80211_WORK_DIRECT_PROBE;
2338 wk->chan = req->bss->channel;
2339 wk->chan_type = NL80211_CHAN_NO_HT;
2340 wk->sdata = sdata;
2341 wk->done = ieee80211_probe_auth_done;
2342
2343 ieee80211_add_work(wk);
2344 return 0;
2345 }
2346
ieee80211_assoc_done(struct ieee80211_work * wk,struct sk_buff * skb)2347 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
2348 struct sk_buff *skb)
2349 {
2350 struct ieee80211_mgmt *mgmt;
2351 struct ieee80211_rx_status *rx_status;
2352 struct ieee802_11_elems elems;
2353 u16 status;
2354
2355 if (!skb) {
2356 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
2357 return WORK_DONE_DESTROY;
2358 }
2359
2360 if (wk->type == IEEE80211_WORK_ASSOC_BEACON_WAIT) {
2361 mutex_lock(&wk->sdata->u.mgd.mtx);
2362 rx_status = (void *) skb->cb;
2363 ieee802_11_parse_elems(skb->data + 24 + 12, skb->len - 24 - 12, &elems);
2364 ieee80211_rx_bss_info(wk->sdata, (void *)skb->data, skb->len, rx_status,
2365 &elems, true);
2366 mutex_unlock(&wk->sdata->u.mgd.mtx);
2367
2368 wk->type = IEEE80211_WORK_ASSOC;
2369 /* not really done yet */
2370 return WORK_DONE_REQUEUE;
2371 }
2372
2373 mgmt = (void *)skb->data;
2374 status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2375
2376 if (status == WLAN_STATUS_SUCCESS) {
2377 mutex_lock(&wk->sdata->u.mgd.mtx);
2378 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
2379 mutex_unlock(&wk->sdata->u.mgd.mtx);
2380 /* oops -- internal error -- send timeout for now */
2381 cfg80211_send_assoc_timeout(wk->sdata->dev,
2382 wk->filter_ta);
2383 return WORK_DONE_DESTROY;
2384 }
2385
2386 mutex_unlock(&wk->sdata->u.mgd.mtx);
2387 }
2388
2389 cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2390 return WORK_DONE_DESTROY;
2391 }
2392
ieee80211_mgd_assoc(struct ieee80211_sub_if_data * sdata,struct cfg80211_assoc_request * req)2393 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2394 struct cfg80211_assoc_request *req)
2395 {
2396 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2397 struct ieee80211_bss *bss = (void *)req->bss->priv;
2398 struct ieee80211_work *wk;
2399 const u8 *ssid;
2400 int i;
2401
2402 mutex_lock(&ifmgd->mtx);
2403 if (ifmgd->associated) {
2404 if (!req->prev_bssid ||
2405 memcmp(req->prev_bssid, ifmgd->associated->bssid,
2406 ETH_ALEN)) {
2407 /*
2408 * We are already associated and the request was not a
2409 * reassociation request from the current BSS, so
2410 * reject it.
2411 */
2412 mutex_unlock(&ifmgd->mtx);
2413 return -EALREADY;
2414 }
2415
2416 /* Trying to reassociate - clear previous association state */
2417 ieee80211_set_disassoc(sdata, true, false);
2418 }
2419 mutex_unlock(&ifmgd->mtx);
2420
2421 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2422 if (!wk)
2423 return -ENOMEM;
2424
2425 ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2426 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2427
2428 ifmgd->beacon_crc_valid = false;
2429
2430 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2431 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2432 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2433 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2434 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2435
2436
2437 if (req->ie && req->ie_len) {
2438 memcpy(wk->ie, req->ie, req->ie_len);
2439 wk->ie_len = req->ie_len;
2440 } else
2441 wk->ie_len = 0;
2442
2443 wk->assoc.bss = req->bss;
2444
2445 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2446
2447 /* new association always uses requested smps mode */
2448 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2449 if (ifmgd->powersave)
2450 ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2451 else
2452 ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2453 } else
2454 ifmgd->ap_smps = ifmgd->req_smps;
2455
2456 wk->assoc.smps = ifmgd->ap_smps;
2457 /*
2458 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2459 * We still associate in non-HT mode (11a/b/g) if any one of these
2460 * ciphers is configured as pairwise.
2461 * We can set this to true for non-11n hardware, that'll be checked
2462 * separately along with the peer capabilities.
2463 */
2464 wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2465 wk->assoc.capability = req->bss->capability;
2466 wk->assoc.wmm_used = bss->wmm_used;
2467 wk->assoc.supp_rates = bss->supp_rates;
2468 wk->assoc.supp_rates_len = bss->supp_rates_len;
2469 wk->assoc.ht_information_ie =
2470 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2471
2472 if (bss->wmm_used && bss->uapsd_supported &&
2473 (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2474 wk->assoc.uapsd_used = true;
2475 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2476 } else {
2477 wk->assoc.uapsd_used = false;
2478 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2479 }
2480
2481 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2482 memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2483 wk->assoc.ssid_len = ssid[1];
2484
2485 if (req->prev_bssid)
2486 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2487
2488 wk->chan = req->bss->channel;
2489 wk->chan_type = NL80211_CHAN_NO_HT;
2490 wk->sdata = sdata;
2491 wk->done = ieee80211_assoc_done;
2492 if (!bss->dtim_period &&
2493 sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
2494 wk->type = IEEE80211_WORK_ASSOC_BEACON_WAIT;
2495 else
2496 wk->type = IEEE80211_WORK_ASSOC;
2497
2498 if (req->use_mfp) {
2499 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2500 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2501 } else {
2502 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2503 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2504 }
2505
2506 if (req->crypto.control_port)
2507 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2508 else
2509 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2510
2511 sdata->control_port_protocol = req->crypto.control_port_ethertype;
2512 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
2513
2514 ieee80211_add_work(wk);
2515 return 0;
2516 }
2517
ieee80211_mgd_deauth(struct ieee80211_sub_if_data * sdata,struct cfg80211_deauth_request * req,void * cookie)2518 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2519 struct cfg80211_deauth_request *req,
2520 void *cookie)
2521 {
2522 struct ieee80211_local *local = sdata->local;
2523 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2524 struct ieee80211_work *wk;
2525 u8 bssid[ETH_ALEN];
2526 bool assoc_bss = false;
2527
2528 mutex_lock(&ifmgd->mtx);
2529
2530 memcpy(bssid, req->bss->bssid, ETH_ALEN);
2531 if (ifmgd->associated == req->bss) {
2532 ieee80211_set_disassoc(sdata, false, true);
2533 mutex_unlock(&ifmgd->mtx);
2534 assoc_bss = true;
2535 } else {
2536 bool not_auth_yet = false;
2537
2538 mutex_unlock(&ifmgd->mtx);
2539
2540 mutex_lock(&local->mtx);
2541 list_for_each_entry(wk, &local->work_list, list) {
2542 if (wk->sdata != sdata)
2543 continue;
2544
2545 if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2546 wk->type != IEEE80211_WORK_AUTH &&
2547 wk->type != IEEE80211_WORK_ASSOC &&
2548 wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
2549 continue;
2550
2551 if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2552 continue;
2553
2554 not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2555 list_del_rcu(&wk->list);
2556 free_work(wk);
2557 break;
2558 }
2559 mutex_unlock(&local->mtx);
2560
2561 /*
2562 * If somebody requests authentication and we haven't
2563 * sent out an auth frame yet there's no need to send
2564 * out a deauth frame either. If the state was PROBE,
2565 * then this is the case. If it's AUTH we have sent a
2566 * frame, and if it's IDLE we have completed the auth
2567 * process already.
2568 */
2569 if (not_auth_yet) {
2570 __cfg80211_auth_canceled(sdata->dev, bssid);
2571 return 0;
2572 }
2573 }
2574
2575 printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2576 sdata->name, bssid, req->reason_code);
2577
2578 ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2579 req->reason_code, cookie,
2580 !req->local_state_change);
2581 if (assoc_bss)
2582 sta_info_destroy_addr(sdata, bssid);
2583
2584 mutex_lock(&sdata->local->mtx);
2585 ieee80211_recalc_idle(sdata->local);
2586 mutex_unlock(&sdata->local->mtx);
2587
2588 return 0;
2589 }
2590
ieee80211_mgd_disassoc(struct ieee80211_sub_if_data * sdata,struct cfg80211_disassoc_request * req,void * cookie)2591 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2592 struct cfg80211_disassoc_request *req,
2593 void *cookie)
2594 {
2595 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2596 u8 bssid[ETH_ALEN];
2597
2598 mutex_lock(&ifmgd->mtx);
2599
2600 /*
2601 * cfg80211 should catch this ... but it's racy since
2602 * we can receive a disassoc frame, process it, hand it
2603 * to cfg80211 while that's in a locked section already
2604 * trying to tell us that the user wants to disconnect.
2605 */
2606 if (ifmgd->associated != req->bss) {
2607 mutex_unlock(&ifmgd->mtx);
2608 return -ENOLINK;
2609 }
2610
2611 printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2612 sdata->name, req->bss->bssid, req->reason_code);
2613
2614 memcpy(bssid, req->bss->bssid, ETH_ALEN);
2615 ieee80211_set_disassoc(sdata, false, true);
2616
2617 mutex_unlock(&ifmgd->mtx);
2618
2619 ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2620 IEEE80211_STYPE_DISASSOC, req->reason_code,
2621 cookie, !req->local_state_change);
2622 sta_info_destroy_addr(sdata, bssid);
2623
2624 mutex_lock(&sdata->local->mtx);
2625 ieee80211_recalc_idle(sdata->local);
2626 mutex_unlock(&sdata->local->mtx);
2627
2628 return 0;
2629 }
2630
ieee80211_cqm_rssi_notify(struct ieee80211_vif * vif,enum nl80211_cqm_rssi_threshold_event rssi_event,gfp_t gfp)2631 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2632 enum nl80211_cqm_rssi_threshold_event rssi_event,
2633 gfp_t gfp)
2634 {
2635 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2636
2637 trace_api_cqm_rssi_notify(sdata, rssi_event);
2638
2639 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2640 }
2641 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
2642