mac80211: run scan after finish connection monitoring
[linux-3.10.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/moduleparam.h>
20 #include <linux/rtnetlink.h>
21 #include <linux/pm_qos.h>
22 #include <linux/crc32.h>
23 #include <linux/slab.h>
24 #include <linux/export.h>
25 #include <net/mac80211.h>
26 #include <asm/unaligned.h>
27
28 #include "ieee80211_i.h"
29 #include "driver-ops.h"
30 #include "rate.h"
31 #include "led.h"
32
33 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
34 #define IEEE80211_AUTH_MAX_TRIES 3
35 #define IEEE80211_AUTH_WAIT_ASSOC (HZ * 5)
36 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
37 #define IEEE80211_ASSOC_MAX_TRIES 3
38
39 static int max_nullfunc_tries = 2;
40 module_param(max_nullfunc_tries, int, 0644);
41 MODULE_PARM_DESC(max_nullfunc_tries,
42                  "Maximum nullfunc tx tries before disconnecting (reason 4).");
43
44 static int max_probe_tries = 5;
45 module_param(max_probe_tries, int, 0644);
46 MODULE_PARM_DESC(max_probe_tries,
47                  "Maximum probe tries before disconnecting (reason 4).");
48
49 /*
50  * Beacon loss timeout is calculated as N frames times the
51  * advertised beacon interval.  This may need to be somewhat
52  * higher than what hardware might detect to account for
53  * delays in the host processing frames. But since we also
54  * probe on beacon miss before declaring the connection lost
55  * default to what we want.
56  */
57 #define IEEE80211_BEACON_LOSS_COUNT     7
58
59 /*
60  * Time the connection can be idle before we probe
61  * it to see if we can still talk to the AP.
62  */
63 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
64 /*
65  * Time we wait for a probe response after sending
66  * a probe request because of beacon loss or for
67  * checking the connection still works.
68  */
69 static int probe_wait_ms = 500;
70 module_param(probe_wait_ms, int, 0644);
71 MODULE_PARM_DESC(probe_wait_ms,
72                  "Maximum time(ms) to wait for probe response"
73                  " before disconnecting (reason 4).");
74
75 /*
76  * Weight given to the latest Beacon frame when calculating average signal
77  * strength for Beacon frames received in the current BSS. This must be
78  * between 1 and 15.
79  */
80 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
81
82 /*
83  * How many Beacon frames need to have been used in average signal strength
84  * before starting to indicate signal change events.
85  */
86 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
87
88 #define TMR_RUNNING_TIMER       0
89 #define TMR_RUNNING_CHANSW      1
90
91 #define DEAUTH_DISASSOC_LEN     (24 /* hdr */ + 2 /* reason */)
92
93 /*
94  * All cfg80211 functions have to be called outside a locked
95  * section so that they can acquire a lock themselves... This
96  * is much simpler than queuing up things in cfg80211, but we
97  * do need some indirection for that here.
98  */
99 enum rx_mgmt_action {
100         /* no action required */
101         RX_MGMT_NONE,
102
103         /* caller must call cfg80211_send_deauth() */
104         RX_MGMT_CFG80211_DEAUTH,
105
106         /* caller must call cfg80211_send_disassoc() */
107         RX_MGMT_CFG80211_DISASSOC,
108
109         /* caller must call cfg80211_send_rx_auth() */
110         RX_MGMT_CFG80211_RX_AUTH,
111
112         /* caller must call cfg80211_send_rx_assoc() */
113         RX_MGMT_CFG80211_RX_ASSOC,
114
115         /* caller must call cfg80211_send_assoc_timeout() */
116         RX_MGMT_CFG80211_ASSOC_TIMEOUT,
117 };
118
119 /* utils */
120 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
121 {
122         lockdep_assert_held(&ifmgd->mtx);
123 }
124
125 /*
126  * We can have multiple work items (and connection probing)
127  * scheduling this timer, but we need to take care to only
128  * reschedule it when it should fire _earlier_ than it was
129  * asked for before, or if it's not pending right now. This
130  * function ensures that. Note that it then is required to
131  * run this function for all timeouts after the first one
132  * has happened -- the work that runs from this timer will
133  * do that.
134  */
135 static void run_again(struct ieee80211_if_managed *ifmgd, unsigned long timeout)
136 {
137         ASSERT_MGD_MTX(ifmgd);
138
139         if (!timer_pending(&ifmgd->timer) ||
140             time_before(timeout, ifmgd->timer.expires))
141                 mod_timer(&ifmgd->timer, timeout);
142 }
143
144 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
145 {
146         if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
147                 return;
148
149         mod_timer(&sdata->u.mgd.bcn_mon_timer,
150                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
151 }
152
153 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
154 {
155         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
156
157         if (unlikely(!sdata->u.mgd.associated))
158                 return;
159
160         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
161                 return;
162
163         mod_timer(&sdata->u.mgd.conn_mon_timer,
164                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
165
166         ifmgd->probe_send_count = 0;
167 }
168
169 static int ecw2cw(int ecw)
170 {
171         return (1 << ecw) - 1;
172 }
173
174 static u32 ieee80211_config_ht_tx(struct ieee80211_sub_if_data *sdata,
175                                   struct ieee80211_ht_operation *ht_oper,
176                                   const u8 *bssid, bool reconfig)
177 {
178         struct ieee80211_local *local = sdata->local;
179         struct ieee80211_supported_band *sband;
180         struct sta_info *sta;
181         u32 changed = 0;
182         u16 ht_opmode;
183         bool disable_40 = false;
184
185         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
186
187         switch (sdata->vif.bss_conf.channel_type) {
188         case NL80211_CHAN_HT40PLUS:
189                 if (local->hw.conf.channel->flags & IEEE80211_CHAN_NO_HT40PLUS)
190                         disable_40 = true;
191                 break;
192         case NL80211_CHAN_HT40MINUS:
193                 if (local->hw.conf.channel->flags & IEEE80211_CHAN_NO_HT40MINUS)
194                         disable_40 = true;
195                 break;
196         default:
197                 break;
198         }
199
200         /* This can change during the lifetime of the BSS */
201         if (!(ht_oper->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY))
202                 disable_40 = true;
203
204         mutex_lock(&local->sta_mtx);
205         sta = sta_info_get(sdata, bssid);
206
207         WARN_ON_ONCE(!sta);
208
209         if (sta && !sta->supports_40mhz)
210                 disable_40 = true;
211
212         if (sta && (!reconfig ||
213                     (disable_40 != !(sta->sta.ht_cap.cap &
214                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40)))) {
215
216                 if (disable_40)
217                         sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
218                 else
219                         sta->sta.ht_cap.cap |= IEEE80211_HT_CAP_SUP_WIDTH_20_40;
220
221                 rate_control_rate_update(local, sband, sta,
222                                          IEEE80211_RC_BW_CHANGED);
223         }
224         mutex_unlock(&local->sta_mtx);
225
226         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
227
228         /* if bss configuration changed store the new one */
229         if (!reconfig || (sdata->vif.bss_conf.ht_operation_mode != ht_opmode)) {
230                 changed |= BSS_CHANGED_HT;
231                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
232         }
233
234         return changed;
235 }
236
237 /* frame sending functions */
238
239 static int ieee80211_compatible_rates(const u8 *supp_rates, int supp_rates_len,
240                                       struct ieee80211_supported_band *sband,
241                                       u32 *rates)
242 {
243         int i, j, count;
244         *rates = 0;
245         count = 0;
246         for (i = 0; i < supp_rates_len; i++) {
247                 int rate = (supp_rates[i] & 0x7F) * 5;
248
249                 for (j = 0; j < sband->n_bitrates; j++)
250                         if (sband->bitrates[j].bitrate == rate) {
251                                 *rates |= BIT(j);
252                                 count++;
253                                 break;
254                         }
255         }
256
257         return count;
258 }
259
260 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
261                                 struct sk_buff *skb, const u8 *ht_oper_ie,
262                                 struct ieee80211_supported_band *sband,
263                                 struct ieee80211_channel *channel,
264                                 enum ieee80211_smps_mode smps)
265 {
266         struct ieee80211_ht_operation *ht_oper;
267         u8 *pos;
268         u32 flags = channel->flags;
269         u16 cap;
270         struct ieee80211_sta_ht_cap ht_cap;
271
272         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
273
274         if (!ht_oper_ie)
275                 return;
276
277         if (ht_oper_ie[1] < sizeof(struct ieee80211_ht_operation))
278                 return;
279
280         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
281         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
282
283         ht_oper = (struct ieee80211_ht_operation *)(ht_oper_ie + 2);
284
285         /* determine capability flags */
286         cap = ht_cap.cap;
287
288         switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
289         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
290                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
291                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
292                         cap &= ~IEEE80211_HT_CAP_SGI_40;
293                 }
294                 break;
295         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
296                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
297                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
298                         cap &= ~IEEE80211_HT_CAP_SGI_40;
299                 }
300                 break;
301         }
302
303         /*
304          * If 40 MHz was disabled associate as though we weren't
305          * capable of 40 MHz -- some broken APs will never fall
306          * back to trying to transmit in 20 MHz.
307          */
308         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
309                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
310                 cap &= ~IEEE80211_HT_CAP_SGI_40;
311         }
312
313         /* set SM PS mode properly */
314         cap &= ~IEEE80211_HT_CAP_SM_PS;
315         switch (smps) {
316         case IEEE80211_SMPS_AUTOMATIC:
317         case IEEE80211_SMPS_NUM_MODES:
318                 WARN_ON(1);
319         case IEEE80211_SMPS_OFF:
320                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
321                         IEEE80211_HT_CAP_SM_PS_SHIFT;
322                 break;
323         case IEEE80211_SMPS_STATIC:
324                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
325                         IEEE80211_HT_CAP_SM_PS_SHIFT;
326                 break;
327         case IEEE80211_SMPS_DYNAMIC:
328                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
329                         IEEE80211_HT_CAP_SM_PS_SHIFT;
330                 break;
331         }
332
333         /* reserve and fill IE */
334         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
335         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
336 }
337
338 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
339 {
340         struct ieee80211_local *local = sdata->local;
341         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
342         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
343         struct sk_buff *skb;
344         struct ieee80211_mgmt *mgmt;
345         u8 *pos, qos_info;
346         size_t offset = 0, noffset;
347         int i, count, rates_len, supp_rates_len;
348         u16 capab;
349         struct ieee80211_supported_band *sband;
350         u32 rates = 0;
351
352         lockdep_assert_held(&ifmgd->mtx);
353
354         sband = local->hw.wiphy->bands[local->oper_channel->band];
355
356         if (assoc_data->supp_rates_len) {
357                 /*
358                  * Get all rates supported by the device and the AP as
359                  * some APs don't like getting a superset of their rates
360                  * in the association request (e.g. D-Link DAP 1353 in
361                  * b-only mode)...
362                  */
363                 rates_len = ieee80211_compatible_rates(assoc_data->supp_rates,
364                                                        assoc_data->supp_rates_len,
365                                                        sband, &rates);
366         } else {
367                 /*
368                  * In case AP not provide any supported rates information
369                  * before association, we send information element(s) with
370                  * all rates that we support.
371                  */
372                 rates = ~0;
373                 rates_len = sband->n_bitrates;
374         }
375
376         skb = alloc_skb(local->hw.extra_tx_headroom +
377                         sizeof(*mgmt) + /* bit too much but doesn't matter */
378                         2 + assoc_data->ssid_len + /* SSID */
379                         4 + rates_len + /* (extended) rates */
380                         4 + /* power capability */
381                         2 + 2 * sband->n_channels + /* supported channels */
382                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
383                         assoc_data->ie_len + /* extra IEs */
384                         9, /* WMM */
385                         GFP_KERNEL);
386         if (!skb)
387                 return;
388
389         skb_reserve(skb, local->hw.extra_tx_headroom);
390
391         capab = WLAN_CAPABILITY_ESS;
392
393         if (sband->band == IEEE80211_BAND_2GHZ) {
394                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
395                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
396                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
397                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
398         }
399
400         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
401                 capab |= WLAN_CAPABILITY_PRIVACY;
402
403         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
404             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
405                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
406
407         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
408         memset(mgmt, 0, 24);
409         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
410         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
411         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
412
413         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
414                 skb_put(skb, 10);
415                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
416                                                   IEEE80211_STYPE_REASSOC_REQ);
417                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
418                 mgmt->u.reassoc_req.listen_interval =
419                                 cpu_to_le16(local->hw.conf.listen_interval);
420                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
421                        ETH_ALEN);
422         } else {
423                 skb_put(skb, 4);
424                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
425                                                   IEEE80211_STYPE_ASSOC_REQ);
426                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
427                 mgmt->u.assoc_req.listen_interval =
428                                 cpu_to_le16(local->hw.conf.listen_interval);
429         }
430
431         /* SSID */
432         pos = skb_put(skb, 2 + assoc_data->ssid_len);
433         *pos++ = WLAN_EID_SSID;
434         *pos++ = assoc_data->ssid_len;
435         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
436
437         /* add all rates which were marked to be used above */
438         supp_rates_len = rates_len;
439         if (supp_rates_len > 8)
440                 supp_rates_len = 8;
441
442         pos = skb_put(skb, supp_rates_len + 2);
443         *pos++ = WLAN_EID_SUPP_RATES;
444         *pos++ = supp_rates_len;
445
446         count = 0;
447         for (i = 0; i < sband->n_bitrates; i++) {
448                 if (BIT(i) & rates) {
449                         int rate = sband->bitrates[i].bitrate;
450                         *pos++ = (u8) (rate / 5);
451                         if (++count == 8)
452                                 break;
453                 }
454         }
455
456         if (rates_len > count) {
457                 pos = skb_put(skb, rates_len - count + 2);
458                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
459                 *pos++ = rates_len - count;
460
461                 for (i++; i < sband->n_bitrates; i++) {
462                         if (BIT(i) & rates) {
463                                 int rate = sband->bitrates[i].bitrate;
464                                 *pos++ = (u8) (rate / 5);
465                         }
466                 }
467         }
468
469         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
470                 /* 1. power capabilities */
471                 pos = skb_put(skb, 4);
472                 *pos++ = WLAN_EID_PWR_CAPABILITY;
473                 *pos++ = 2;
474                 *pos++ = 0; /* min tx power */
475                 *pos++ = local->oper_channel->max_power; /* max tx power */
476
477                 /* 2. supported channels */
478                 /* TODO: get this in reg domain format */
479                 pos = skb_put(skb, 2 * sband->n_channels + 2);
480                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
481                 *pos++ = 2 * sband->n_channels;
482                 for (i = 0; i < sband->n_channels; i++) {
483                         *pos++ = ieee80211_frequency_to_channel(
484                                         sband->channels[i].center_freq);
485                         *pos++ = 1; /* one channel in the subband*/
486                 }
487         }
488
489         /* if present, add any custom IEs that go before HT */
490         if (assoc_data->ie_len && assoc_data->ie) {
491                 static const u8 before_ht[] = {
492                         WLAN_EID_SSID,
493                         WLAN_EID_SUPP_RATES,
494                         WLAN_EID_EXT_SUPP_RATES,
495                         WLAN_EID_PWR_CAPABILITY,
496                         WLAN_EID_SUPPORTED_CHANNELS,
497                         WLAN_EID_RSN,
498                         WLAN_EID_QOS_CAPA,
499                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
500                         WLAN_EID_MOBILITY_DOMAIN,
501                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
502                 };
503                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
504                                              before_ht, ARRAY_SIZE(before_ht),
505                                              offset);
506                 pos = skb_put(skb, noffset - offset);
507                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
508                 offset = noffset;
509         }
510
511         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
512                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ht_operation_ie,
513                                     sband, local->oper_channel, ifmgd->ap_smps);
514
515         /* if present, add any custom non-vendor IEs that go after HT */
516         if (assoc_data->ie_len && assoc_data->ie) {
517                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
518                                                     assoc_data->ie_len,
519                                                     offset);
520                 pos = skb_put(skb, noffset - offset);
521                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
522                 offset = noffset;
523         }
524
525         if (assoc_data->wmm) {
526                 if (assoc_data->uapsd) {
527                         qos_info = ifmgd->uapsd_queues;
528                         qos_info |= (ifmgd->uapsd_max_sp_len <<
529                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
530                 } else {
531                         qos_info = 0;
532                 }
533
534                 pos = skb_put(skb, 9);
535                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
536                 *pos++ = 7; /* len */
537                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
538                 *pos++ = 0x50;
539                 *pos++ = 0xf2;
540                 *pos++ = 2; /* WME */
541                 *pos++ = 0; /* WME info */
542                 *pos++ = 1; /* WME ver */
543                 *pos++ = qos_info;
544         }
545
546         /* add any remaining custom (i.e. vendor specific here) IEs */
547         if (assoc_data->ie_len && assoc_data->ie) {
548                 noffset = assoc_data->ie_len;
549                 pos = skb_put(skb, noffset - offset);
550                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
551         }
552
553         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
554         ieee80211_tx_skb(sdata, skb);
555 }
556
557 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
558                                            const u8 *bssid, u16 stype,
559                                            u16 reason, bool send_frame,
560                                            u8 *frame_buf)
561 {
562         struct ieee80211_local *local = sdata->local;
563         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
564         struct sk_buff *skb;
565         struct ieee80211_mgmt *mgmt = (void *)frame_buf;
566
567         /* build frame */
568         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
569         mgmt->duration = 0; /* initialize only */
570         mgmt->seq_ctrl = 0; /* initialize only */
571         memcpy(mgmt->da, bssid, ETH_ALEN);
572         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
573         memcpy(mgmt->bssid, bssid, ETH_ALEN);
574         /* u.deauth.reason_code == u.disassoc.reason_code */
575         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
576
577         if (send_frame) {
578                 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
579                                     DEAUTH_DISASSOC_LEN);
580                 if (!skb)
581                         return;
582
583                 skb_reserve(skb, local->hw.extra_tx_headroom);
584
585                 /* copy in frame */
586                 memcpy(skb_put(skb, DEAUTH_DISASSOC_LEN),
587                        mgmt, DEAUTH_DISASSOC_LEN);
588
589                 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
590                         IEEE80211_SKB_CB(skb)->flags |=
591                                 IEEE80211_TX_INTFL_DONT_ENCRYPT;
592                 ieee80211_tx_skb(sdata, skb);
593         }
594 }
595
596 void ieee80211_send_pspoll(struct ieee80211_local *local,
597                            struct ieee80211_sub_if_data *sdata)
598 {
599         struct ieee80211_pspoll *pspoll;
600         struct sk_buff *skb;
601
602         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
603         if (!skb)
604                 return;
605
606         pspoll = (struct ieee80211_pspoll *) skb->data;
607         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
608
609         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
610         ieee80211_tx_skb(sdata, skb);
611 }
612
613 void ieee80211_send_nullfunc(struct ieee80211_local *local,
614                              struct ieee80211_sub_if_data *sdata,
615                              int powersave)
616 {
617         struct sk_buff *skb;
618         struct ieee80211_hdr_3addr *nullfunc;
619         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
620
621         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
622         if (!skb)
623                 return;
624
625         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
626         if (powersave)
627                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
628
629         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
630         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
631                             IEEE80211_STA_CONNECTION_POLL))
632                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
633
634         ieee80211_tx_skb(sdata, skb);
635 }
636
637 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
638                                           struct ieee80211_sub_if_data *sdata)
639 {
640         struct sk_buff *skb;
641         struct ieee80211_hdr *nullfunc;
642         __le16 fc;
643
644         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
645                 return;
646
647         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
648         if (!skb)
649                 return;
650
651         skb_reserve(skb, local->hw.extra_tx_headroom);
652
653         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
654         memset(nullfunc, 0, 30);
655         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
656                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
657         nullfunc->frame_control = fc;
658         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
659         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
660         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
661         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
662
663         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
664         ieee80211_tx_skb(sdata, skb);
665 }
666
667 /* spectrum management related things */
668 static void ieee80211_chswitch_work(struct work_struct *work)
669 {
670         struct ieee80211_sub_if_data *sdata =
671                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
672         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
673
674         if (!ieee80211_sdata_running(sdata))
675                 return;
676
677         mutex_lock(&ifmgd->mtx);
678         if (!ifmgd->associated)
679                 goto out;
680
681         sdata->local->oper_channel = sdata->local->csa_channel;
682         if (!sdata->local->ops->channel_switch) {
683                 /* call "hw_config" only if doing sw channel switch */
684                 ieee80211_hw_config(sdata->local,
685                         IEEE80211_CONF_CHANGE_CHANNEL);
686         } else {
687                 /* update the device channel directly */
688                 sdata->local->hw.conf.channel = sdata->local->oper_channel;
689         }
690
691         /* XXX: shouldn't really modify cfg80211-owned data! */
692         ifmgd->associated->channel = sdata->local->oper_channel;
693
694         ieee80211_wake_queues_by_reason(&sdata->local->hw,
695                                         IEEE80211_QUEUE_STOP_REASON_CSA);
696  out:
697         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
698         mutex_unlock(&ifmgd->mtx);
699 }
700
701 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
702 {
703         struct ieee80211_sub_if_data *sdata;
704         struct ieee80211_if_managed *ifmgd;
705
706         sdata = vif_to_sdata(vif);
707         ifmgd = &sdata->u.mgd;
708
709         trace_api_chswitch_done(sdata, success);
710         if (!success) {
711                 /*
712                  * If the channel switch was not successful, stay
713                  * around on the old channel. We currently lack
714                  * good handling of this situation, possibly we
715                  * should just drop the association.
716                  */
717                 sdata->local->csa_channel = sdata->local->oper_channel;
718         }
719
720         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
721 }
722 EXPORT_SYMBOL(ieee80211_chswitch_done);
723
724 static void ieee80211_chswitch_timer(unsigned long data)
725 {
726         struct ieee80211_sub_if_data *sdata =
727                 (struct ieee80211_sub_if_data *) data;
728         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
729
730         if (sdata->local->quiescing) {
731                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
732                 return;
733         }
734
735         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
736 }
737
738 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
739                                       struct ieee80211_channel_sw_ie *sw_elem,
740                                       struct ieee80211_bss *bss,
741                                       u64 timestamp)
742 {
743         struct cfg80211_bss *cbss =
744                 container_of((void *)bss, struct cfg80211_bss, priv);
745         struct ieee80211_channel *new_ch;
746         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
747         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
748                                                       cbss->channel->band);
749
750         ASSERT_MGD_MTX(ifmgd);
751
752         if (!ifmgd->associated)
753                 return;
754
755         if (sdata->local->scanning)
756                 return;
757
758         /* Disregard subsequent beacons if we are already running a timer
759            processing a CSA */
760
761         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
762                 return;
763
764         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
765         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
766                 return;
767
768         sdata->local->csa_channel = new_ch;
769
770         if (sdata->local->ops->channel_switch) {
771                 /* use driver's channel switch callback */
772                 struct ieee80211_channel_switch ch_switch;
773                 memset(&ch_switch, 0, sizeof(ch_switch));
774                 ch_switch.timestamp = timestamp;
775                 if (sw_elem->mode) {
776                         ch_switch.block_tx = true;
777                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
778                                         IEEE80211_QUEUE_STOP_REASON_CSA);
779                 }
780                 ch_switch.channel = new_ch;
781                 ch_switch.count = sw_elem->count;
782                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
783                 drv_channel_switch(sdata->local, &ch_switch);
784                 return;
785         }
786
787         /* channel switch handled in software */
788         if (sw_elem->count <= 1) {
789                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
790         } else {
791                 if (sw_elem->mode)
792                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
793                                         IEEE80211_QUEUE_STOP_REASON_CSA);
794                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
795                 mod_timer(&ifmgd->chswitch_timer,
796                           jiffies +
797                           msecs_to_jiffies(sw_elem->count *
798                                            cbss->beacon_interval));
799         }
800 }
801
802 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
803                                         u16 capab_info, u8 *pwr_constr_elem,
804                                         u8 pwr_constr_elem_len)
805 {
806         struct ieee80211_conf *conf = &sdata->local->hw.conf;
807
808         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
809                 return;
810
811         /* Power constraint IE length should be 1 octet */
812         if (pwr_constr_elem_len != 1)
813                 return;
814
815         if ((*pwr_constr_elem <= conf->channel->max_reg_power) &&
816             (*pwr_constr_elem != sdata->local->power_constr_level)) {
817                 sdata->local->power_constr_level = *pwr_constr_elem;
818                 ieee80211_hw_config(sdata->local, 0);
819         }
820 }
821
822 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
823 {
824         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
825         struct ieee80211_local *local = sdata->local;
826         struct ieee80211_conf *conf = &local->hw.conf;
827
828         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
829                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
830                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
831
832         local->disable_dynamic_ps = false;
833         conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
834 }
835 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
836
837 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
838 {
839         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
840         struct ieee80211_local *local = sdata->local;
841         struct ieee80211_conf *conf = &local->hw.conf;
842
843         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
844                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
845                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
846
847         local->disable_dynamic_ps = true;
848         conf->dynamic_ps_timeout = 0;
849         del_timer_sync(&local->dynamic_ps_timer);
850         ieee80211_queue_work(&local->hw,
851                              &local->dynamic_ps_enable_work);
852 }
853 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
854
855 /* powersave */
856 static void ieee80211_enable_ps(struct ieee80211_local *local,
857                                 struct ieee80211_sub_if_data *sdata)
858 {
859         struct ieee80211_conf *conf = &local->hw.conf;
860
861         /*
862          * If we are scanning right now then the parameters will
863          * take effect when scan finishes.
864          */
865         if (local->scanning)
866                 return;
867
868         if (conf->dynamic_ps_timeout > 0 &&
869             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
870                 mod_timer(&local->dynamic_ps_timer, jiffies +
871                           msecs_to_jiffies(conf->dynamic_ps_timeout));
872         } else {
873                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
874                         ieee80211_send_nullfunc(local, sdata, 1);
875
876                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
877                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
878                         return;
879
880                 conf->flags |= IEEE80211_CONF_PS;
881                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
882         }
883 }
884
885 static void ieee80211_change_ps(struct ieee80211_local *local)
886 {
887         struct ieee80211_conf *conf = &local->hw.conf;
888
889         if (local->ps_sdata) {
890                 ieee80211_enable_ps(local, local->ps_sdata);
891         } else if (conf->flags & IEEE80211_CONF_PS) {
892                 conf->flags &= ~IEEE80211_CONF_PS;
893                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
894                 del_timer_sync(&local->dynamic_ps_timer);
895                 cancel_work_sync(&local->dynamic_ps_enable_work);
896         }
897 }
898
899 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
900 {
901         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
902         struct sta_info *sta = NULL;
903         bool authorized = false;
904
905         if (!mgd->powersave)
906                 return false;
907
908         if (mgd->broken_ap)
909                 return false;
910
911         if (!mgd->associated)
912                 return false;
913
914         if (!mgd->associated->beacon_ies)
915                 return false;
916
917         if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
918                           IEEE80211_STA_CONNECTION_POLL))
919                 return false;
920
921         rcu_read_lock();
922         sta = sta_info_get(sdata, mgd->bssid);
923         if (sta)
924                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
925         rcu_read_unlock();
926
927         return authorized;
928 }
929
930 /* need to hold RTNL or interface lock */
931 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
932 {
933         struct ieee80211_sub_if_data *sdata, *found = NULL;
934         int count = 0;
935         int timeout;
936
937         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
938                 local->ps_sdata = NULL;
939                 return;
940         }
941
942         if (!list_empty(&local->work_list)) {
943                 local->ps_sdata = NULL;
944                 goto change;
945         }
946
947         list_for_each_entry(sdata, &local->interfaces, list) {
948                 if (!ieee80211_sdata_running(sdata))
949                         continue;
950                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
951                         /* If an AP vif is found, then disable PS
952                          * by setting the count to zero thereby setting
953                          * ps_sdata to NULL.
954                          */
955                         count = 0;
956                         break;
957                 }
958                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
959                         continue;
960                 found = sdata;
961                 count++;
962         }
963
964         if (count == 1 && ieee80211_powersave_allowed(found)) {
965                 struct ieee80211_conf *conf = &local->hw.conf;
966                 s32 beaconint_us;
967
968                 if (latency < 0)
969                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
970
971                 beaconint_us = ieee80211_tu_to_usec(
972                                         found->vif.bss_conf.beacon_int);
973
974                 timeout = local->dynamic_ps_forced_timeout;
975                 if (timeout < 0) {
976                         /*
977                          * Go to full PSM if the user configures a very low
978                          * latency requirement.
979                          * The 2000 second value is there for compatibility
980                          * until the PM_QOS_NETWORK_LATENCY is configured
981                          * with real values.
982                          */
983                         if (latency > (1900 * USEC_PER_MSEC) &&
984                             latency != (2000 * USEC_PER_SEC))
985                                 timeout = 0;
986                         else
987                                 timeout = 100;
988                 }
989                 local->dynamic_ps_user_timeout = timeout;
990                 if (!local->disable_dynamic_ps)
991                         conf->dynamic_ps_timeout =
992                                 local->dynamic_ps_user_timeout;
993
994                 if (beaconint_us > latency) {
995                         local->ps_sdata = NULL;
996                 } else {
997                         struct ieee80211_bss *bss;
998                         int maxslp = 1;
999                         u8 dtimper;
1000
1001                         bss = (void *)found->u.mgd.associated->priv;
1002                         dtimper = bss->dtim_period;
1003
1004                         /* If the TIM IE is invalid, pretend the value is 1 */
1005                         if (!dtimper)
1006                                 dtimper = 1;
1007                         else if (dtimper > 1)
1008                                 maxslp = min_t(int, dtimper,
1009                                                     latency / beaconint_us);
1010
1011                         local->hw.conf.max_sleep_period = maxslp;
1012                         local->hw.conf.ps_dtim_period = dtimper;
1013                         local->ps_sdata = found;
1014                 }
1015         } else {
1016                 local->ps_sdata = NULL;
1017         }
1018
1019  change:
1020         ieee80211_change_ps(local);
1021 }
1022
1023 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1024 {
1025         struct ieee80211_local *local =
1026                 container_of(work, struct ieee80211_local,
1027                              dynamic_ps_disable_work);
1028
1029         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1030                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1031                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1032         }
1033
1034         ieee80211_wake_queues_by_reason(&local->hw,
1035                                         IEEE80211_QUEUE_STOP_REASON_PS);
1036 }
1037
1038 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1039 {
1040         struct ieee80211_local *local =
1041                 container_of(work, struct ieee80211_local,
1042                              dynamic_ps_enable_work);
1043         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1044         struct ieee80211_if_managed *ifmgd;
1045         unsigned long flags;
1046         int q;
1047
1048         /* can only happen when PS was just disabled anyway */
1049         if (!sdata)
1050                 return;
1051
1052         ifmgd = &sdata->u.mgd;
1053
1054         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1055                 return;
1056
1057         if (!local->disable_dynamic_ps &&
1058             local->hw.conf.dynamic_ps_timeout > 0) {
1059                 /* don't enter PS if TX frames are pending */
1060                 if (drv_tx_frames_pending(local)) {
1061                         mod_timer(&local->dynamic_ps_timer, jiffies +
1062                                   msecs_to_jiffies(
1063                                   local->hw.conf.dynamic_ps_timeout));
1064                         return;
1065                 }
1066
1067                 /*
1068                  * transmission can be stopped by others which leads to
1069                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1070                  * is not the actual idle state.
1071                  */
1072                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1073                 for (q = 0; q < local->hw.queues; q++) {
1074                         if (local->queue_stop_reasons[q]) {
1075                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1076                                                        flags);
1077                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1078                                           msecs_to_jiffies(
1079                                           local->hw.conf.dynamic_ps_timeout));
1080                                 return;
1081                         }
1082                 }
1083                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1084         }
1085
1086         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1087             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1088                 netif_tx_stop_all_queues(sdata->dev);
1089
1090                 if (drv_tx_frames_pending(local))
1091                         mod_timer(&local->dynamic_ps_timer, jiffies +
1092                                   msecs_to_jiffies(
1093                                   local->hw.conf.dynamic_ps_timeout));
1094                 else {
1095                         ieee80211_send_nullfunc(local, sdata, 1);
1096                         /* Flush to get the tx status of nullfunc frame */
1097                         drv_flush(local, false);
1098                 }
1099         }
1100
1101         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1102               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1103             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1104                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1105                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1106                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1107         }
1108
1109         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1110                 netif_tx_wake_all_queues(sdata->dev);
1111 }
1112
1113 void ieee80211_dynamic_ps_timer(unsigned long data)
1114 {
1115         struct ieee80211_local *local = (void *) data;
1116
1117         if (local->quiescing || local->suspended)
1118                 return;
1119
1120         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1121 }
1122
1123 /* MLME */
1124 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
1125                                      struct ieee80211_sub_if_data *sdata,
1126                                      u8 *wmm_param, size_t wmm_param_len)
1127 {
1128         struct ieee80211_tx_queue_params params;
1129         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1130         size_t left;
1131         int count;
1132         u8 *pos, uapsd_queues = 0;
1133
1134         if (!local->ops->conf_tx)
1135                 return;
1136
1137         if (local->hw.queues < IEEE80211_NUM_ACS)
1138                 return;
1139
1140         if (!wmm_param)
1141                 return;
1142
1143         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1144                 return;
1145
1146         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1147                 uapsd_queues = ifmgd->uapsd_queues;
1148
1149         count = wmm_param[6] & 0x0f;
1150         if (count == ifmgd->wmm_last_param_set)
1151                 return;
1152         ifmgd->wmm_last_param_set = count;
1153
1154         pos = wmm_param + 8;
1155         left = wmm_param_len - 8;
1156
1157         memset(&params, 0, sizeof(params));
1158
1159         local->wmm_acm = 0;
1160         for (; left >= 4; left -= 4, pos += 4) {
1161                 int aci = (pos[0] >> 5) & 0x03;
1162                 int acm = (pos[0] >> 4) & 0x01;
1163                 bool uapsd = false;
1164                 int queue;
1165
1166                 switch (aci) {
1167                 case 1: /* AC_BK */
1168                         queue = 3;
1169                         if (acm)
1170                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1171                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1172                                 uapsd = true;
1173                         break;
1174                 case 2: /* AC_VI */
1175                         queue = 1;
1176                         if (acm)
1177                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1178                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1179                                 uapsd = true;
1180                         break;
1181                 case 3: /* AC_VO */
1182                         queue = 0;
1183                         if (acm)
1184                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1185                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1186                                 uapsd = true;
1187                         break;
1188                 case 0: /* AC_BE */
1189                 default:
1190                         queue = 2;
1191                         if (acm)
1192                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1193                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1194                                 uapsd = true;
1195                         break;
1196                 }
1197
1198                 params.aifs = pos[0] & 0x0f;
1199                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1200                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1201                 params.txop = get_unaligned_le16(pos + 2);
1202                 params.uapsd = uapsd;
1203
1204 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1205                 wiphy_debug(local->hw.wiphy,
1206                             "WMM queue=%d aci=%d acm=%d aifs=%d "
1207                             "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1208                             queue, aci, acm,
1209                             params.aifs, params.cw_min, params.cw_max,
1210                             params.txop, params.uapsd);
1211 #endif
1212                 sdata->tx_conf[queue] = params;
1213                 if (drv_conf_tx(local, sdata, queue, &params))
1214                         wiphy_debug(local->hw.wiphy,
1215                                     "failed to set TX queue parameters for queue %d\n",
1216                                     queue);
1217         }
1218
1219         /* enable WMM or activate new settings */
1220         sdata->vif.bss_conf.qos = true;
1221 }
1222
1223 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1224 {
1225         lockdep_assert_held(&sdata->local->mtx);
1226
1227         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1228                                 IEEE80211_STA_BEACON_POLL);
1229         ieee80211_run_deferred_scan(sdata->local);
1230 }
1231
1232 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1233 {
1234         mutex_lock(&sdata->local->mtx);
1235         __ieee80211_stop_poll(sdata);
1236         mutex_unlock(&sdata->local->mtx);
1237 }
1238
1239 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1240                                            u16 capab, bool erp_valid, u8 erp)
1241 {
1242         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1243         u32 changed = 0;
1244         bool use_protection;
1245         bool use_short_preamble;
1246         bool use_short_slot;
1247
1248         if (erp_valid) {
1249                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1250                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1251         } else {
1252                 use_protection = false;
1253                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1254         }
1255
1256         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1257         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
1258                 use_short_slot = true;
1259
1260         if (use_protection != bss_conf->use_cts_prot) {
1261                 bss_conf->use_cts_prot = use_protection;
1262                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1263         }
1264
1265         if (use_short_preamble != bss_conf->use_short_preamble) {
1266                 bss_conf->use_short_preamble = use_short_preamble;
1267                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1268         }
1269
1270         if (use_short_slot != bss_conf->use_short_slot) {
1271                 bss_conf->use_short_slot = use_short_slot;
1272                 changed |= BSS_CHANGED_ERP_SLOT;
1273         }
1274
1275         return changed;
1276 }
1277
1278 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1279                                      struct cfg80211_bss *cbss,
1280                                      u32 bss_info_changed)
1281 {
1282         struct ieee80211_bss *bss = (void *)cbss->priv;
1283         struct ieee80211_local *local = sdata->local;
1284         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1285
1286         bss_info_changed |= BSS_CHANGED_ASSOC;
1287         /* set timing information */
1288         bss_conf->beacon_int = cbss->beacon_interval;
1289         bss_conf->last_tsf = cbss->tsf;
1290
1291         bss_info_changed |= BSS_CHANGED_BEACON_INT;
1292         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1293                 cbss->capability, bss->has_erp_value, bss->erp_value);
1294
1295         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1296                 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
1297
1298         sdata->u.mgd.associated = cbss;
1299         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1300
1301         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1302
1303         /* just to be sure */
1304         ieee80211_stop_poll(sdata);
1305
1306         ieee80211_led_assoc(local, 1);
1307
1308         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
1309                 bss_conf->dtim_period = bss->dtim_period;
1310         else
1311                 bss_conf->dtim_period = 0;
1312
1313         bss_conf->assoc = 1;
1314
1315         /* Tell the driver to monitor connection quality (if supported) */
1316         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1317             bss_conf->cqm_rssi_thold)
1318                 bss_info_changed |= BSS_CHANGED_CQM;
1319
1320         /* Enable ARP filtering */
1321         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
1322                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
1323                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1324         }
1325
1326         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1327
1328         mutex_lock(&local->iflist_mtx);
1329         ieee80211_recalc_ps(local, -1);
1330         ieee80211_recalc_smps(local);
1331         mutex_unlock(&local->iflist_mtx);
1332
1333         netif_tx_start_all_queues(sdata->dev);
1334         netif_carrier_on(sdata->dev);
1335 }
1336
1337 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1338                                    u16 stype, u16 reason, bool tx,
1339                                    u8 *frame_buf)
1340 {
1341         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1342         struct ieee80211_local *local = sdata->local;
1343         struct sta_info *sta;
1344         u32 changed = 0;
1345         u8 bssid[ETH_ALEN];
1346
1347         ASSERT_MGD_MTX(ifmgd);
1348
1349         if (WARN_ON_ONCE(tx && !frame_buf))
1350                 return;
1351
1352         if (WARN_ON(!ifmgd->associated))
1353                 return;
1354
1355         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1356
1357         ifmgd->associated = NULL;
1358         memset(ifmgd->bssid, 0, ETH_ALEN);
1359
1360         /*
1361          * we need to commit the associated = NULL change because the
1362          * scan code uses that to determine whether this iface should
1363          * go to/wake up from powersave or not -- and could otherwise
1364          * wake the queues erroneously.
1365          */
1366         smp_mb();
1367
1368         /*
1369          * Thus, we can only afterwards stop the queues -- to account
1370          * for the case where another CPU is finishing a scan at this
1371          * time -- we don't want the scan code to enable queues.
1372          */
1373
1374         netif_tx_stop_all_queues(sdata->dev);
1375         netif_carrier_off(sdata->dev);
1376
1377         mutex_lock(&local->sta_mtx);
1378         sta = sta_info_get(sdata, bssid);
1379         if (sta) {
1380                 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
1381                 ieee80211_sta_tear_down_BA_sessions(sta, tx);
1382         }
1383         mutex_unlock(&local->sta_mtx);
1384
1385         /* deauthenticate/disassociate now */
1386         if (tx || frame_buf)
1387                 ieee80211_send_deauth_disassoc(sdata, bssid, stype, reason,
1388                                                tx, frame_buf);
1389
1390         /* flush out frame */
1391         if (tx)
1392                 drv_flush(local, false);
1393
1394         /* remove AP and TDLS peers */
1395         sta_info_flush(local, sdata);
1396
1397         /* finally reset all BSS / config parameters */
1398         changed |= ieee80211_reset_erp_info(sdata);
1399
1400         ieee80211_led_assoc(local, 0);
1401         changed |= BSS_CHANGED_ASSOC;
1402         sdata->vif.bss_conf.assoc = false;
1403
1404         /* on the next assoc, re-program HT parameters */
1405         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1406         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1407
1408         local->power_constr_level = 0;
1409
1410         del_timer_sync(&local->dynamic_ps_timer);
1411         cancel_work_sync(&local->dynamic_ps_enable_work);
1412
1413         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1414                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1415                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1416         }
1417         local->ps_sdata = NULL;
1418
1419         /* Disable ARP filtering */
1420         if (sdata->vif.bss_conf.arp_filter_enabled) {
1421                 sdata->vif.bss_conf.arp_filter_enabled = false;
1422                 changed |= BSS_CHANGED_ARP_FILTER;
1423         }
1424
1425         sdata->vif.bss_conf.qos = false;
1426         changed |= BSS_CHANGED_QOS;
1427
1428         /* The BSSID (not really interesting) and HT changed */
1429         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1430         ieee80211_bss_info_change_notify(sdata, changed);
1431
1432         /* channel(_type) changes are handled by ieee80211_hw_config */
1433         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
1434         ieee80211_hw_config(local, 0);
1435
1436         /* disassociated - set to defaults now */
1437         ieee80211_set_wmm_default(sdata, false);
1438
1439         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1440         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1441         del_timer_sync(&sdata->u.mgd.timer);
1442         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1443 }
1444
1445 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1446                              struct ieee80211_hdr *hdr)
1447 {
1448         /*
1449          * We can postpone the mgd.timer whenever receiving unicast frames
1450          * from AP because we know that the connection is working both ways
1451          * at that time. But multicast frames (and hence also beacons) must
1452          * be ignored here, because we need to trigger the timer during
1453          * data idle periods for sending the periodic probe request to the
1454          * AP we're connected to.
1455          */
1456         if (is_multicast_ether_addr(hdr->addr1))
1457                 return;
1458
1459         ieee80211_sta_reset_conn_monitor(sdata);
1460 }
1461
1462 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1463 {
1464         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1465         struct ieee80211_local *local = sdata->local;
1466
1467         mutex_lock(&local->mtx);
1468         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1469                               IEEE80211_STA_CONNECTION_POLL))) {
1470                 mutex_unlock(&local->mtx);
1471                 return;
1472         }
1473
1474         __ieee80211_stop_poll(sdata);
1475
1476         mutex_lock(&local->iflist_mtx);
1477         ieee80211_recalc_ps(local, -1);
1478         mutex_unlock(&local->iflist_mtx);
1479
1480         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1481                 goto out;
1482
1483         /*
1484          * We've received a probe response, but are not sure whether
1485          * we have or will be receiving any beacons or data, so let's
1486          * schedule the timers again, just in case.
1487          */
1488         ieee80211_sta_reset_beacon_monitor(sdata);
1489
1490         mod_timer(&ifmgd->conn_mon_timer,
1491                   round_jiffies_up(jiffies +
1492                                    IEEE80211_CONNECTION_IDLE_TIME));
1493 out:
1494         mutex_unlock(&local->mtx);
1495 }
1496
1497 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1498                              struct ieee80211_hdr *hdr, bool ack)
1499 {
1500         if (!ieee80211_is_data(hdr->frame_control))
1501             return;
1502
1503         if (ack)
1504                 ieee80211_sta_reset_conn_monitor(sdata);
1505
1506         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1507             sdata->u.mgd.probe_send_count > 0) {
1508                 if (ack)
1509                         sdata->u.mgd.probe_send_count = 0;
1510                 else
1511                         sdata->u.mgd.nullfunc_failed = true;
1512                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1513         }
1514 }
1515
1516 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1517 {
1518         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1519         const u8 *ssid;
1520         u8 *dst = ifmgd->associated->bssid;
1521         u8 unicast_limit = max(1, max_probe_tries - 3);
1522
1523         /*
1524          * Try sending broadcast probe requests for the last three
1525          * probe requests after the first ones failed since some
1526          * buggy APs only support broadcast probe requests.
1527          */
1528         if (ifmgd->probe_send_count >= unicast_limit)
1529                 dst = NULL;
1530
1531         /*
1532          * When the hardware reports an accurate Tx ACK status, it's
1533          * better to send a nullfunc frame instead of a probe request,
1534          * as it will kick us off the AP quickly if we aren't associated
1535          * anymore. The timeout will be reset if the frame is ACKed by
1536          * the AP.
1537          */
1538         ifmgd->probe_send_count++;
1539
1540         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1541                 ifmgd->nullfunc_failed = false;
1542                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1543         } else {
1544                 int ssid_len;
1545
1546                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1547                 if (WARN_ON_ONCE(ssid == NULL))
1548                         ssid_len = 0;
1549                 else
1550                         ssid_len = ssid[1];
1551
1552                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
1553                                          0, (u32) -1, true, false);
1554         }
1555
1556         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1557         run_again(ifmgd, ifmgd->probe_timeout);
1558         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
1559                 drv_flush(sdata->local, false);
1560 }
1561
1562 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1563                                    bool beacon)
1564 {
1565         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1566         bool already = false;
1567
1568         if (!ieee80211_sdata_running(sdata))
1569                 return;
1570
1571         mutex_lock(&ifmgd->mtx);
1572
1573         if (!ifmgd->associated)
1574                 goto out;
1575
1576         mutex_lock(&sdata->local->mtx);
1577
1578         if (sdata->local->tmp_channel || sdata->local->scanning) {
1579                 mutex_unlock(&sdata->local->mtx);
1580                 goto out;
1581         }
1582
1583 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1584         if (beacon)
1585                 net_dbg_ratelimited("%s: detected beacon loss from AP - sending probe request\n",
1586                                     sdata->name);
1587 #endif
1588
1589         /*
1590          * The driver/our work has already reported this event or the
1591          * connection monitoring has kicked in and we have already sent
1592          * a probe request. Or maybe the AP died and the driver keeps
1593          * reporting until we disassociate...
1594          *
1595          * In either case we have to ignore the current call to this
1596          * function (except for setting the correct probe reason bit)
1597          * because otherwise we would reset the timer every time and
1598          * never check whether we received a probe response!
1599          */
1600         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1601                             IEEE80211_STA_CONNECTION_POLL))
1602                 already = true;
1603
1604         if (beacon)
1605                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1606         else
1607                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1608
1609         mutex_unlock(&sdata->local->mtx);
1610
1611         if (already)
1612                 goto out;
1613
1614         mutex_lock(&sdata->local->iflist_mtx);
1615         ieee80211_recalc_ps(sdata->local, -1);
1616         mutex_unlock(&sdata->local->iflist_mtx);
1617
1618         ifmgd->probe_send_count = 0;
1619         ieee80211_mgd_probe_ap_send(sdata);
1620  out:
1621         mutex_unlock(&ifmgd->mtx);
1622 }
1623
1624 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1625                                           struct ieee80211_vif *vif)
1626 {
1627         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1628         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1629         struct sk_buff *skb;
1630         const u8 *ssid;
1631         int ssid_len;
1632
1633         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1634                 return NULL;
1635
1636         ASSERT_MGD_MTX(ifmgd);
1637
1638         if (!ifmgd->associated)
1639                 return NULL;
1640
1641         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1642         if (WARN_ON_ONCE(ssid == NULL))
1643                 ssid_len = 0;
1644         else
1645                 ssid_len = ssid[1];
1646
1647         skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid,
1648                                         (u32) -1, ssid + 2, ssid_len,
1649                                         NULL, 0, true);
1650
1651         return skb;
1652 }
1653 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1654
1655 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1656 {
1657         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1658         struct ieee80211_local *local = sdata->local;
1659         u8 bssid[ETH_ALEN];
1660         u8 frame_buf[DEAUTH_DISASSOC_LEN];
1661
1662         mutex_lock(&ifmgd->mtx);
1663         if (!ifmgd->associated) {
1664                 mutex_unlock(&ifmgd->mtx);
1665                 return;
1666         }
1667
1668         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1669
1670         printk(KERN_DEBUG "%s: Connection to AP %pM lost.\n",
1671                sdata->name, bssid);
1672
1673         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
1674                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1675                                false, frame_buf);
1676         mutex_unlock(&ifmgd->mtx);
1677
1678         /*
1679          * must be outside lock due to cfg80211,
1680          * but that's not a problem.
1681          */
1682         cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
1683
1684         mutex_lock(&local->mtx);
1685         ieee80211_recalc_idle(local);
1686         mutex_unlock(&local->mtx);
1687 }
1688
1689 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1690 {
1691         struct ieee80211_sub_if_data *sdata =
1692                 container_of(work, struct ieee80211_sub_if_data,
1693                              u.mgd.beacon_connection_loss_work);
1694         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1695         struct sta_info *sta;
1696
1697         if (ifmgd->associated) {
1698                 rcu_read_lock();
1699                 sta = sta_info_get(sdata, ifmgd->bssid);
1700                 if (sta)
1701                         sta->beacon_loss_count++;
1702                 rcu_read_unlock();
1703         }
1704
1705         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1706                 __ieee80211_connection_loss(sdata);
1707         else
1708                 ieee80211_mgd_probe_ap(sdata, true);
1709 }
1710
1711 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1712 {
1713         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1714         struct ieee80211_hw *hw = &sdata->local->hw;
1715
1716         trace_api_beacon_loss(sdata);
1717
1718         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1719         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1720 }
1721 EXPORT_SYMBOL(ieee80211_beacon_loss);
1722
1723 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1724 {
1725         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1726         struct ieee80211_hw *hw = &sdata->local->hw;
1727
1728         trace_api_connection_loss(sdata);
1729
1730         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1731         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1732 }
1733 EXPORT_SYMBOL(ieee80211_connection_loss);
1734
1735
1736 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
1737                                         bool assoc)
1738 {
1739         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1740
1741         lockdep_assert_held(&sdata->u.mgd.mtx);
1742
1743         if (!assoc) {
1744                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
1745
1746                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1747                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1748         }
1749
1750         cfg80211_put_bss(auth_data->bss);
1751         kfree(auth_data);
1752         sdata->u.mgd.auth_data = NULL;
1753 }
1754
1755 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1756                                      struct ieee80211_mgmt *mgmt, size_t len)
1757 {
1758         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1759         u8 *pos;
1760         struct ieee802_11_elems elems;
1761
1762         pos = mgmt->u.auth.variable;
1763         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1764         if (!elems.challenge)
1765                 return;
1766         auth_data->expected_transaction = 4;
1767         ieee80211_send_auth(sdata, 3, auth_data->algorithm,
1768                             elems.challenge - 2, elems.challenge_len + 2,
1769                             auth_data->bss->bssid, auth_data->bss->bssid,
1770                             auth_data->key, auth_data->key_len,
1771                             auth_data->key_idx);
1772 }
1773
1774 static enum rx_mgmt_action __must_check
1775 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1776                        struct ieee80211_mgmt *mgmt, size_t len)
1777 {
1778         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1779         u8 bssid[ETH_ALEN];
1780         u16 auth_alg, auth_transaction, status_code;
1781         struct sta_info *sta;
1782
1783         lockdep_assert_held(&ifmgd->mtx);
1784
1785         if (len < 24 + 6)
1786                 return RX_MGMT_NONE;
1787
1788         if (!ifmgd->auth_data || ifmgd->auth_data->done)
1789                 return RX_MGMT_NONE;
1790
1791         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
1792
1793         if (!ether_addr_equal(bssid, mgmt->bssid))
1794                 return RX_MGMT_NONE;
1795
1796         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1797         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1798         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1799
1800         if (auth_alg != ifmgd->auth_data->algorithm ||
1801             auth_transaction != ifmgd->auth_data->expected_transaction)
1802                 return RX_MGMT_NONE;
1803
1804         if (status_code != WLAN_STATUS_SUCCESS) {
1805                 printk(KERN_DEBUG "%s: %pM denied authentication (status %d)\n",
1806                        sdata->name, mgmt->sa, status_code);
1807                 goto out;
1808         }
1809
1810         switch (ifmgd->auth_data->algorithm) {
1811         case WLAN_AUTH_OPEN:
1812         case WLAN_AUTH_LEAP:
1813         case WLAN_AUTH_FT:
1814                 break;
1815         case WLAN_AUTH_SHARED_KEY:
1816                 if (ifmgd->auth_data->expected_transaction != 4) {
1817                         ieee80211_auth_challenge(sdata, mgmt, len);
1818                         /* need another frame */
1819                         return RX_MGMT_NONE;
1820                 }
1821                 break;
1822         default:
1823                 WARN_ONCE(1, "invalid auth alg %d",
1824                           ifmgd->auth_data->algorithm);
1825                 return RX_MGMT_NONE;
1826         }
1827
1828         printk(KERN_DEBUG "%s: authenticated\n", sdata->name);
1829  out:
1830         ifmgd->auth_data->done = true;
1831         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
1832         run_again(ifmgd, ifmgd->auth_data->timeout);
1833
1834         /* move station state to auth */
1835         mutex_lock(&sdata->local->sta_mtx);
1836         sta = sta_info_get(sdata, bssid);
1837         if (!sta) {
1838                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
1839                 goto out_err;
1840         }
1841         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
1842                 printk(KERN_DEBUG "%s: failed moving %pM to auth\n",
1843                        sdata->name, bssid);
1844                 goto out_err;
1845         }
1846         mutex_unlock(&sdata->local->sta_mtx);
1847
1848         return RX_MGMT_CFG80211_RX_AUTH;
1849  out_err:
1850         mutex_unlock(&sdata->local->sta_mtx);
1851         /* ignore frame -- wait for timeout */
1852         return RX_MGMT_NONE;
1853 }
1854
1855
1856 static enum rx_mgmt_action __must_check
1857 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1858                          struct ieee80211_mgmt *mgmt, size_t len)
1859 {
1860         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1861         const u8 *bssid = NULL;
1862         u16 reason_code;
1863
1864         lockdep_assert_held(&ifmgd->mtx);
1865
1866         if (len < 24 + 2)
1867                 return RX_MGMT_NONE;
1868
1869         if (!ifmgd->associated ||
1870             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
1871                 return RX_MGMT_NONE;
1872
1873         bssid = ifmgd->associated->bssid;
1874
1875         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1876
1877         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1878                         sdata->name, bssid, reason_code);
1879
1880         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1881
1882         mutex_lock(&sdata->local->mtx);
1883         ieee80211_recalc_idle(sdata->local);
1884         mutex_unlock(&sdata->local->mtx);
1885
1886         return RX_MGMT_CFG80211_DEAUTH;
1887 }
1888
1889
1890 static enum rx_mgmt_action __must_check
1891 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1892                            struct ieee80211_mgmt *mgmt, size_t len)
1893 {
1894         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1895         u16 reason_code;
1896
1897         lockdep_assert_held(&ifmgd->mtx);
1898
1899         if (len < 24 + 2)
1900                 return RX_MGMT_NONE;
1901
1902         if (!ifmgd->associated ||
1903             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
1904                 return RX_MGMT_NONE;
1905
1906         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1907
1908         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1909                         sdata->name, mgmt->sa, reason_code);
1910
1911         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1912
1913         mutex_lock(&sdata->local->mtx);
1914         ieee80211_recalc_idle(sdata->local);
1915         mutex_unlock(&sdata->local->mtx);
1916
1917         return RX_MGMT_CFG80211_DISASSOC;
1918 }
1919
1920 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
1921                                 u8 *supp_rates, unsigned int supp_rates_len,
1922                                 u32 *rates, u32 *basic_rates,
1923                                 bool *have_higher_than_11mbit,
1924                                 int *min_rate, int *min_rate_index)
1925 {
1926         int i, j;
1927
1928         for (i = 0; i < supp_rates_len; i++) {
1929                 int rate = (supp_rates[i] & 0x7f) * 5;
1930                 bool is_basic = !!(supp_rates[i] & 0x80);
1931
1932                 if (rate > 110)
1933                         *have_higher_than_11mbit = true;
1934
1935                 /*
1936                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
1937                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
1938                  *
1939                  * Note: Even through the membership selector and the basic
1940                  *       rate flag share the same bit, they are not exactly
1941                  *       the same.
1942                  */
1943                 if (!!(supp_rates[i] & 0x80) &&
1944                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1945                         continue;
1946
1947                 for (j = 0; j < sband->n_bitrates; j++) {
1948                         if (sband->bitrates[j].bitrate == rate) {
1949                                 *rates |= BIT(j);
1950                                 if (is_basic)
1951                                         *basic_rates |= BIT(j);
1952                                 if (rate < *min_rate) {
1953                                         *min_rate = rate;
1954                                         *min_rate_index = j;
1955                                 }
1956                                 break;
1957                         }
1958                 }
1959         }
1960 }
1961
1962 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
1963                                          bool assoc)
1964 {
1965         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
1966
1967         lockdep_assert_held(&sdata->u.mgd.mtx);
1968
1969         if (!assoc) {
1970                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
1971
1972                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1973                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1974         }
1975
1976         kfree(assoc_data);
1977         sdata->u.mgd.assoc_data = NULL;
1978 }
1979
1980 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
1981                                     struct cfg80211_bss *cbss,
1982                                     struct ieee80211_mgmt *mgmt, size_t len)
1983 {
1984         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1985         struct ieee80211_local *local = sdata->local;
1986         struct ieee80211_supported_band *sband;
1987         struct sta_info *sta;
1988         u8 *pos;
1989         u16 capab_info, aid;
1990         struct ieee802_11_elems elems;
1991         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1992         u32 changed = 0;
1993         int err;
1994
1995         /* AssocResp and ReassocResp have identical structure */
1996
1997         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1998         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1999
2000         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2001                 printk(KERN_DEBUG
2002                        "%s: invalid AID value 0x%x; bits 15:14 not set\n",
2003                        sdata->name, aid);
2004         aid &= ~(BIT(15) | BIT(14));
2005
2006         ifmgd->broken_ap = false;
2007
2008         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2009                 printk(KERN_DEBUG
2010                        "%s: invalid AID value %d (out of range), turn off PS\n",
2011                        sdata->name, aid);
2012                 aid = 0;
2013                 ifmgd->broken_ap = true;
2014         }
2015
2016         pos = mgmt->u.assoc_resp.variable;
2017         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2018
2019         if (!elems.supp_rates) {
2020                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
2021                        sdata->name);
2022                 return false;
2023         }
2024
2025         ifmgd->aid = aid;
2026
2027         mutex_lock(&sdata->local->sta_mtx);
2028         /*
2029          * station info was already allocated and inserted before
2030          * the association and should be available to us
2031          */
2032         sta = sta_info_get(sdata, cbss->bssid);
2033         if (WARN_ON(!sta)) {
2034                 mutex_unlock(&sdata->local->sta_mtx);
2035                 return false;
2036         }
2037
2038         sband = local->hw.wiphy->bands[local->oper_channel->band];
2039
2040         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2041                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2042                                 elems.ht_cap_elem, &sta->sta.ht_cap);
2043
2044         sta->supports_40mhz =
2045                 sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40;
2046
2047         rate_control_rate_init(sta);
2048
2049         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2050                 set_sta_flag(sta, WLAN_STA_MFP);
2051
2052         if (elems.wmm_param)
2053                 set_sta_flag(sta, WLAN_STA_WME);
2054
2055         err = sta_info_move_state(sta, IEEE80211_STA_AUTH);
2056         if (!err)
2057                 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2058         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2059                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2060         if (err) {
2061                 printk(KERN_DEBUG
2062                        "%s: failed to move station %pM to desired state\n",
2063                        sdata->name, sta->sta.addr);
2064                 WARN_ON(__sta_info_destroy(sta));
2065                 mutex_unlock(&sdata->local->sta_mtx);
2066                 return false;
2067         }
2068
2069         mutex_unlock(&sdata->local->sta_mtx);
2070
2071         /*
2072          * Always handle WMM once after association regardless
2073          * of the first value the AP uses. Setting -1 here has
2074          * that effect because the AP values is an unsigned
2075          * 4-bit value.
2076          */
2077         ifmgd->wmm_last_param_set = -1;
2078
2079         if (elems.wmm_param)
2080                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2081                                          elems.wmm_param_len);
2082         else
2083                 ieee80211_set_wmm_default(sdata, false);
2084         changed |= BSS_CHANGED_QOS;
2085
2086         if (elems.ht_operation && elems.wmm_param &&
2087             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2088                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2089                                                   cbss->bssid, false);
2090
2091         /* set AID and assoc capability,
2092          * ieee80211_set_associated() will tell the driver */
2093         bss_conf->aid = aid;
2094         bss_conf->assoc_capability = capab_info;
2095         ieee80211_set_associated(sdata, cbss, changed);
2096
2097         /*
2098          * If we're using 4-addr mode, let the AP know that we're
2099          * doing so, so that it can create the STA VLAN on its side
2100          */
2101         if (ifmgd->use_4addr)
2102                 ieee80211_send_4addr_nullfunc(local, sdata);
2103
2104         /*
2105          * Start timer to probe the connection to the AP now.
2106          * Also start the timer that will detect beacon loss.
2107          */
2108         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2109         ieee80211_sta_reset_beacon_monitor(sdata);
2110
2111         return true;
2112 }
2113
2114 static enum rx_mgmt_action __must_check
2115 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2116                              struct ieee80211_mgmt *mgmt, size_t len,
2117                              struct cfg80211_bss **bss)
2118 {
2119         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2120         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2121         u16 capab_info, status_code, aid;
2122         struct ieee802_11_elems elems;
2123         u8 *pos;
2124         bool reassoc;
2125
2126         lockdep_assert_held(&ifmgd->mtx);
2127
2128         if (!assoc_data)
2129                 return RX_MGMT_NONE;
2130         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2131                 return RX_MGMT_NONE;
2132
2133         /*
2134          * AssocResp and ReassocResp have identical structure, so process both
2135          * of them in this function.
2136          */
2137
2138         if (len < 24 + 6)
2139                 return RX_MGMT_NONE;
2140
2141         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2142         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2143         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2144         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2145
2146         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
2147                "status=%d aid=%d)\n",
2148                sdata->name, reassoc ? "Rea" : "A", mgmt->sa,
2149                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2150
2151         pos = mgmt->u.assoc_resp.variable;
2152         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2153
2154         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2155             elems.timeout_int && elems.timeout_int_len == 5 &&
2156             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2157                 u32 tu, ms;
2158                 tu = get_unaligned_le32(elems.timeout_int + 1);
2159                 ms = tu * 1024 / 1000;
2160                 printk(KERN_DEBUG "%s: %pM rejected association temporarily; "
2161                        "comeback duration %u TU (%u ms)\n",
2162                        sdata->name, mgmt->sa, tu, ms);
2163                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2164                 if (ms > IEEE80211_ASSOC_TIMEOUT)
2165                         run_again(ifmgd, assoc_data->timeout);
2166                 return RX_MGMT_NONE;
2167         }
2168
2169         *bss = assoc_data->bss;
2170
2171         if (status_code != WLAN_STATUS_SUCCESS) {
2172                 printk(KERN_DEBUG "%s: %pM denied association (code=%d)\n",
2173                        sdata->name, mgmt->sa, status_code);
2174                 ieee80211_destroy_assoc_data(sdata, false);
2175         } else {
2176                 printk(KERN_DEBUG "%s: associated\n", sdata->name);
2177
2178                 if (!ieee80211_assoc_success(sdata, *bss, mgmt, len)) {
2179                         /* oops -- internal error -- send timeout for now */
2180                         ieee80211_destroy_assoc_data(sdata, true);
2181                         sta_info_destroy_addr(sdata, mgmt->bssid);
2182                         cfg80211_put_bss(*bss);
2183                         return RX_MGMT_CFG80211_ASSOC_TIMEOUT;
2184                 }
2185
2186                 /*
2187                  * destroy assoc_data afterwards, as otherwise an idle
2188                  * recalc after assoc_data is NULL but before associated
2189                  * is set can cause the interface to go idle
2190                  */
2191                 ieee80211_destroy_assoc_data(sdata, true);
2192         }
2193
2194         return RX_MGMT_CFG80211_RX_ASSOC;
2195 }
2196 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2197                                   struct ieee80211_mgmt *mgmt,
2198                                   size_t len,
2199                                   struct ieee80211_rx_status *rx_status,
2200                                   struct ieee802_11_elems *elems,
2201                                   bool beacon)
2202 {
2203         struct ieee80211_local *local = sdata->local;
2204         int freq;
2205         struct ieee80211_bss *bss;
2206         struct ieee80211_channel *channel;
2207         bool need_ps = false;
2208
2209         if (sdata->u.mgd.associated &&
2210             ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid)) {
2211                 bss = (void *)sdata->u.mgd.associated->priv;
2212                 /* not previously set so we may need to recalc */
2213                 need_ps = !bss->dtim_period;
2214         }
2215
2216         if (elems->ds_params && elems->ds_params_len == 1)
2217                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
2218                                                       rx_status->band);
2219         else
2220                 freq = rx_status->freq;
2221
2222         channel = ieee80211_get_channel(local->hw.wiphy, freq);
2223
2224         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2225                 return;
2226
2227         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2228                                         channel, beacon);
2229         if (bss)
2230                 ieee80211_rx_bss_put(local, bss);
2231
2232         if (!sdata->u.mgd.associated)
2233                 return;
2234
2235         if (need_ps) {
2236                 mutex_lock(&local->iflist_mtx);
2237                 ieee80211_recalc_ps(local, -1);
2238                 mutex_unlock(&local->iflist_mtx);
2239         }
2240
2241         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
2242             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
2243                                                         ETH_ALEN) == 0)) {
2244                 struct ieee80211_channel_sw_ie *sw_elem =
2245                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
2246                 ieee80211_sta_process_chanswitch(sdata, sw_elem,
2247                                                  bss, rx_status->mactime);
2248         }
2249 }
2250
2251
2252 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2253                                          struct sk_buff *skb)
2254 {
2255         struct ieee80211_mgmt *mgmt = (void *)skb->data;
2256         struct ieee80211_if_managed *ifmgd;
2257         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2258         size_t baselen, len = skb->len;
2259         struct ieee802_11_elems elems;
2260
2261         ifmgd = &sdata->u.mgd;
2262
2263         ASSERT_MGD_MTX(ifmgd);
2264
2265         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2266                 return; /* ignore ProbeResp to foreign address */
2267
2268         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2269         if (baselen > len)
2270                 return;
2271
2272         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2273                                 &elems);
2274
2275         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
2276
2277         if (ifmgd->associated &&
2278             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2279                 ieee80211_reset_ap_probe(sdata);
2280
2281         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2282             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
2283                 /* got probe response, continue with auth */
2284                 printk(KERN_DEBUG "%s: direct probe responded\n", sdata->name);
2285                 ifmgd->auth_data->tries = 0;
2286                 ifmgd->auth_data->timeout = jiffies;
2287                 run_again(ifmgd, ifmgd->auth_data->timeout);
2288         }
2289 }
2290
2291 /*
2292  * This is the canonical list of information elements we care about,
2293  * the filter code also gives us all changes to the Microsoft OUI
2294  * (00:50:F2) vendor IE which is used for WMM which we need to track.
2295  *
2296  * We implement beacon filtering in software since that means we can
2297  * avoid processing the frame here and in cfg80211, and userspace
2298  * will not be able to tell whether the hardware supports it or not.
2299  *
2300  * XXX: This list needs to be dynamic -- userspace needs to be able to
2301  *      add items it requires. It also needs to be able to tell us to
2302  *      look out for other vendor IEs.
2303  */
2304 static const u64 care_about_ies =
2305         (1ULL << WLAN_EID_COUNTRY) |
2306         (1ULL << WLAN_EID_ERP_INFO) |
2307         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2308         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2309         (1ULL << WLAN_EID_HT_CAPABILITY) |
2310         (1ULL << WLAN_EID_HT_OPERATION);
2311
2312 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2313                                      struct ieee80211_mgmt *mgmt,
2314                                      size_t len,
2315                                      struct ieee80211_rx_status *rx_status)
2316 {
2317         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2318         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2319         size_t baselen;
2320         struct ieee802_11_elems elems;
2321         struct ieee80211_local *local = sdata->local;
2322         u32 changed = 0;
2323         bool erp_valid, directed_tim = false;
2324         u8 erp_value = 0;
2325         u32 ncrc;
2326         u8 *bssid;
2327
2328         lockdep_assert_held(&ifmgd->mtx);
2329
2330         /* Process beacon from the current BSS */
2331         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2332         if (baselen > len)
2333                 return;
2334
2335         if (rx_status->freq != local->hw.conf.channel->center_freq)
2336                 return;
2337
2338         if (ifmgd->assoc_data && !ifmgd->assoc_data->have_beacon &&
2339             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2340                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2341                                        len - baselen, &elems);
2342
2343                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2344                                       false);
2345                 ifmgd->assoc_data->have_beacon = true;
2346                 ifmgd->assoc_data->sent_assoc = false;
2347                 /* continue assoc process */
2348                 ifmgd->assoc_data->timeout = jiffies;
2349                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2350                 return;
2351         }
2352
2353         if (!ifmgd->associated ||
2354             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2355                 return;
2356         bssid = ifmgd->associated->bssid;
2357
2358         /* Track average RSSI from the Beacon frames of the current AP */
2359         ifmgd->last_beacon_signal = rx_status->signal;
2360         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2361                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2362                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
2363                 ifmgd->last_cqm_event_signal = 0;
2364                 ifmgd->count_beacon_signal = 1;
2365                 ifmgd->last_ave_beacon_signal = 0;
2366         } else {
2367                 ifmgd->ave_beacon_signal =
2368                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
2369                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
2370                          ifmgd->ave_beacon_signal) / 16;
2371                 ifmgd->count_beacon_signal++;
2372         }
2373
2374         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
2375             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
2376                 int sig = ifmgd->ave_beacon_signal;
2377                 int last_sig = ifmgd->last_ave_beacon_signal;
2378
2379                 /*
2380                  * if signal crosses either of the boundaries, invoke callback
2381                  * with appropriate parameters
2382                  */
2383                 if (sig > ifmgd->rssi_max_thold &&
2384                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
2385                         ifmgd->last_ave_beacon_signal = sig;
2386                         drv_rssi_callback(local, RSSI_EVENT_HIGH);
2387                 } else if (sig < ifmgd->rssi_min_thold &&
2388                            (last_sig >= ifmgd->rssi_max_thold ||
2389                            last_sig == 0)) {
2390                         ifmgd->last_ave_beacon_signal = sig;
2391                         drv_rssi_callback(local, RSSI_EVENT_LOW);
2392                 }
2393         }
2394
2395         if (bss_conf->cqm_rssi_thold &&
2396             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
2397             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
2398                 int sig = ifmgd->ave_beacon_signal / 16;
2399                 int last_event = ifmgd->last_cqm_event_signal;
2400                 int thold = bss_conf->cqm_rssi_thold;
2401                 int hyst = bss_conf->cqm_rssi_hyst;
2402                 if (sig < thold &&
2403                     (last_event == 0 || sig < last_event - hyst)) {
2404                         ifmgd->last_cqm_event_signal = sig;
2405                         ieee80211_cqm_rssi_notify(
2406                                 &sdata->vif,
2407                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
2408                                 GFP_KERNEL);
2409                 } else if (sig > thold &&
2410                            (last_event == 0 || sig > last_event + hyst)) {
2411                         ifmgd->last_cqm_event_signal = sig;
2412                         ieee80211_cqm_rssi_notify(
2413                                 &sdata->vif,
2414                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
2415                                 GFP_KERNEL);
2416                 }
2417         }
2418
2419         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
2420 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2421                 net_dbg_ratelimited("%s: cancelling probereq poll due to a received beacon\n",
2422                                     sdata->name);
2423 #endif
2424                 mutex_lock(&local->mtx);
2425                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
2426                 ieee80211_run_deferred_scan(local);
2427                 mutex_unlock(&local->mtx);
2428
2429                 mutex_lock(&local->iflist_mtx);
2430                 ieee80211_recalc_ps(local, -1);
2431                 mutex_unlock(&local->iflist_mtx);
2432         }
2433
2434         /*
2435          * Push the beacon loss detection into the future since
2436          * we are processing a beacon from the AP just now.
2437          */
2438         ieee80211_sta_reset_beacon_monitor(sdata);
2439
2440         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
2441         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
2442                                           len - baselen, &elems,
2443                                           care_about_ies, ncrc);
2444
2445         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2446                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
2447                                                    ifmgd->aid);
2448
2449         if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) {
2450                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2451                                       true);
2452
2453                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2454                                          elems.wmm_param_len);
2455         }
2456
2457         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
2458                 if (directed_tim) {
2459                         if (local->hw.conf.dynamic_ps_timeout > 0) {
2460                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2461                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2462                                         ieee80211_hw_config(local,
2463                                                             IEEE80211_CONF_CHANGE_PS);
2464                                 }
2465                                 ieee80211_send_nullfunc(local, sdata, 0);
2466                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
2467                                 local->pspolling = true;
2468
2469                                 /*
2470                                  * Here is assumed that the driver will be
2471                                  * able to send ps-poll frame and receive a
2472                                  * response even though power save mode is
2473                                  * enabled, but some drivers might require
2474                                  * to disable power save here. This needs
2475                                  * to be investigated.
2476                                  */
2477                                 ieee80211_send_pspoll(local, sdata);
2478                         }
2479                 }
2480         }
2481
2482         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
2483                 return;
2484         ifmgd->beacon_crc = ncrc;
2485         ifmgd->beacon_crc_valid = true;
2486
2487         if (elems.erp_info && elems.erp_info_len >= 1) {
2488                 erp_valid = true;
2489                 erp_value = elems.erp_info[0];
2490         } else {
2491                 erp_valid = false;
2492         }
2493         changed |= ieee80211_handle_bss_capability(sdata,
2494                         le16_to_cpu(mgmt->u.beacon.capab_info),
2495                         erp_valid, erp_value);
2496
2497
2498         if (elems.ht_cap_elem && elems.ht_operation && elems.wmm_param &&
2499             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
2500                 struct ieee80211_supported_band *sband;
2501
2502                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2503
2504                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2505                                                   bssid, true);
2506         }
2507
2508         /* Note: country IE parsing is done for us by cfg80211 */
2509         if (elems.country_elem) {
2510                 /* TODO: IBSS also needs this */
2511                 if (elems.pwr_constr_elem)
2512                         ieee80211_handle_pwr_constr(sdata,
2513                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
2514                                 elems.pwr_constr_elem,
2515                                 elems.pwr_constr_elem_len);
2516         }
2517
2518         ieee80211_bss_info_change_notify(sdata, changed);
2519 }
2520
2521 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2522                                   struct sk_buff *skb)
2523 {
2524         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2525         struct ieee80211_rx_status *rx_status;
2526         struct ieee80211_mgmt *mgmt;
2527         struct cfg80211_bss *bss = NULL;
2528         enum rx_mgmt_action rma = RX_MGMT_NONE;
2529         u16 fc;
2530
2531         rx_status = (struct ieee80211_rx_status *) skb->cb;
2532         mgmt = (struct ieee80211_mgmt *) skb->data;
2533         fc = le16_to_cpu(mgmt->frame_control);
2534
2535         mutex_lock(&ifmgd->mtx);
2536
2537         switch (fc & IEEE80211_FCTL_STYPE) {
2538         case IEEE80211_STYPE_BEACON:
2539                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2540                 break;
2541         case IEEE80211_STYPE_PROBE_RESP:
2542                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
2543                 break;
2544         case IEEE80211_STYPE_AUTH:
2545                 rma = ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
2546                 break;
2547         case IEEE80211_STYPE_DEAUTH:
2548                 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
2549                 break;
2550         case IEEE80211_STYPE_DISASSOC:
2551                 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
2552                 break;
2553         case IEEE80211_STYPE_ASSOC_RESP:
2554         case IEEE80211_STYPE_REASSOC_RESP:
2555                 rma = ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, &bss);
2556                 break;
2557         case IEEE80211_STYPE_ACTION:
2558                 switch (mgmt->u.action.category) {
2559                 case WLAN_CATEGORY_SPECTRUM_MGMT:
2560                         ieee80211_sta_process_chanswitch(sdata,
2561                                         &mgmt->u.action.u.chan_switch.sw_elem,
2562                                         (void *)ifmgd->associated->priv,
2563                                         rx_status->mactime);
2564                         break;
2565                 }
2566         }
2567         mutex_unlock(&ifmgd->mtx);
2568
2569         switch (rma) {
2570         case RX_MGMT_NONE:
2571                 /* no action */
2572                 break;
2573         case RX_MGMT_CFG80211_DEAUTH:
2574                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2575                 break;
2576         case RX_MGMT_CFG80211_DISASSOC:
2577                 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
2578                 break;
2579         case RX_MGMT_CFG80211_RX_AUTH:
2580                 cfg80211_send_rx_auth(sdata->dev, (u8 *)mgmt, skb->len);
2581                 break;
2582         case RX_MGMT_CFG80211_RX_ASSOC:
2583                 cfg80211_send_rx_assoc(sdata->dev, bss, (u8 *)mgmt, skb->len);
2584                 break;
2585         case RX_MGMT_CFG80211_ASSOC_TIMEOUT:
2586                 cfg80211_send_assoc_timeout(sdata->dev, mgmt->bssid);
2587                 break;
2588         default:
2589                 WARN(1, "unexpected: %d", rma);
2590         }
2591 }
2592
2593 static void ieee80211_sta_timer(unsigned long data)
2594 {
2595         struct ieee80211_sub_if_data *sdata =
2596                 (struct ieee80211_sub_if_data *) data;
2597         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2598         struct ieee80211_local *local = sdata->local;
2599
2600         if (local->quiescing) {
2601                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2602                 return;
2603         }
2604
2605         ieee80211_queue_work(&local->hw, &sdata->work);
2606 }
2607
2608 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2609                                           u8 *bssid, u8 reason)
2610 {
2611         struct ieee80211_local *local = sdata->local;
2612         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2613         u8 frame_buf[DEAUTH_DISASSOC_LEN];
2614
2615         ieee80211_stop_poll(sdata);
2616
2617         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
2618                                false, frame_buf);
2619         mutex_unlock(&ifmgd->mtx);
2620
2621         /*
2622          * must be outside lock due to cfg80211,
2623          * but that's not a problem.
2624          */
2625         cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
2626
2627         mutex_lock(&local->mtx);
2628         ieee80211_recalc_idle(local);
2629         mutex_unlock(&local->mtx);
2630
2631         mutex_lock(&ifmgd->mtx);
2632 }
2633
2634 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
2635 {
2636         struct ieee80211_local *local = sdata->local;
2637         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2638         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
2639
2640         lockdep_assert_held(&ifmgd->mtx);
2641
2642         if (WARN_ON_ONCE(!auth_data))
2643                 return -EINVAL;
2644
2645         auth_data->tries++;
2646
2647         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
2648                 printk(KERN_DEBUG "%s: authentication with %pM timed out\n",
2649                        sdata->name, auth_data->bss->bssid);
2650
2651                 /*
2652                  * Most likely AP is not in the range so remove the
2653                  * bss struct for that AP.
2654                  */
2655                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
2656
2657                 return -ETIMEDOUT;
2658         }
2659
2660         if (auth_data->bss->proberesp_ies) {
2661                 printk(KERN_DEBUG "%s: send auth to %pM (try %d/%d)\n",
2662                        sdata->name, auth_data->bss->bssid, auth_data->tries,
2663                        IEEE80211_AUTH_MAX_TRIES);
2664
2665                 auth_data->expected_transaction = 2;
2666                 ieee80211_send_auth(sdata, 1, auth_data->algorithm,
2667                                     auth_data->ie, auth_data->ie_len,
2668                                     auth_data->bss->bssid,
2669                                     auth_data->bss->bssid, NULL, 0, 0);
2670         } else {
2671                 const u8 *ssidie;
2672
2673                 printk(KERN_DEBUG "%s: direct probe to %pM (try %d/%i)\n",
2674                        sdata->name, auth_data->bss->bssid, auth_data->tries,
2675                        IEEE80211_AUTH_MAX_TRIES);
2676
2677                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
2678                 if (!ssidie)
2679                         return -EINVAL;
2680                 /*
2681                  * Direct probe is sent to broadcast address as some APs
2682                  * will not answer to direct packet in unassociated state.
2683                  */
2684                 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
2685                                          NULL, 0, (u32) -1, true, false);
2686         }
2687
2688         auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
2689         run_again(ifmgd, auth_data->timeout);
2690
2691         return 0;
2692 }
2693
2694 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
2695 {
2696         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2697         struct ieee80211_local *local = sdata->local;
2698
2699         lockdep_assert_held(&sdata->u.mgd.mtx);
2700
2701         assoc_data->tries++;
2702         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
2703                 printk(KERN_DEBUG "%s: association with %pM timed out\n",
2704                        sdata->name, assoc_data->bss->bssid);
2705
2706                 /*
2707                  * Most likely AP is not in the range so remove the
2708                  * bss struct for that AP.
2709                  */
2710                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
2711
2712                 return -ETIMEDOUT;
2713         }
2714
2715         printk(KERN_DEBUG "%s: associate with %pM (try %d/%d)\n",
2716                sdata->name, assoc_data->bss->bssid, assoc_data->tries,
2717                IEEE80211_ASSOC_MAX_TRIES);
2718         ieee80211_send_assoc(sdata);
2719
2720         assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
2721         run_again(&sdata->u.mgd, assoc_data->timeout);
2722
2723         return 0;
2724 }
2725
2726 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2727 {
2728         struct ieee80211_local *local = sdata->local;
2729         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2730
2731         mutex_lock(&ifmgd->mtx);
2732
2733         if (ifmgd->auth_data &&
2734             time_after(jiffies, ifmgd->auth_data->timeout)) {
2735                 if (ifmgd->auth_data->done) {
2736                         /*
2737                          * ok ... we waited for assoc but userspace didn't,
2738                          * so let's just kill the auth data
2739                          */
2740                         ieee80211_destroy_auth_data(sdata, false);
2741                 } else if (ieee80211_probe_auth(sdata)) {
2742                         u8 bssid[ETH_ALEN];
2743
2744                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2745
2746                         ieee80211_destroy_auth_data(sdata, false);
2747
2748                         mutex_unlock(&ifmgd->mtx);
2749                         cfg80211_send_auth_timeout(sdata->dev, bssid);
2750                         mutex_lock(&ifmgd->mtx);
2751                 }
2752         } else if (ifmgd->auth_data)
2753                 run_again(ifmgd, ifmgd->auth_data->timeout);
2754
2755         if (ifmgd->assoc_data &&
2756             time_after(jiffies, ifmgd->assoc_data->timeout)) {
2757                 if (!ifmgd->assoc_data->have_beacon ||
2758                     ieee80211_do_assoc(sdata)) {
2759                         u8 bssid[ETH_ALEN];
2760
2761                         memcpy(bssid, ifmgd->assoc_data->bss->bssid, ETH_ALEN);
2762
2763                         ieee80211_destroy_assoc_data(sdata, false);
2764
2765                         mutex_unlock(&ifmgd->mtx);
2766                         cfg80211_send_assoc_timeout(sdata->dev, bssid);
2767                         mutex_lock(&ifmgd->mtx);
2768                 }
2769         } else if (ifmgd->assoc_data)
2770                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2771
2772         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2773                             IEEE80211_STA_CONNECTION_POLL) &&
2774             ifmgd->associated) {
2775                 u8 bssid[ETH_ALEN];
2776                 int max_tries;
2777
2778                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2779
2780                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2781                         max_tries = max_nullfunc_tries;
2782                 else
2783                         max_tries = max_probe_tries;
2784
2785                 /* ACK received for nullfunc probing frame */
2786                 if (!ifmgd->probe_send_count)
2787                         ieee80211_reset_ap_probe(sdata);
2788                 else if (ifmgd->nullfunc_failed) {
2789                         if (ifmgd->probe_send_count < max_tries) {
2790 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2791                                 wiphy_debug(local->hw.wiphy,
2792                                             "%s: No ack for nullfunc frame to"
2793                                             " AP %pM, try %d/%i\n",
2794                                             sdata->name, bssid,
2795                                             ifmgd->probe_send_count, max_tries);
2796 #endif
2797                                 ieee80211_mgd_probe_ap_send(sdata);
2798                         } else {
2799 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2800                                 wiphy_debug(local->hw.wiphy,
2801                                             "%s: No ack for nullfunc frame to"
2802                                             " AP %pM, disconnecting.\n",
2803                                             sdata->name, bssid);
2804 #endif
2805                                 ieee80211_sta_connection_lost(sdata, bssid,
2806                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2807                         }
2808                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
2809                         run_again(ifmgd, ifmgd->probe_timeout);
2810                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2811 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2812                         wiphy_debug(local->hw.wiphy,
2813                                     "%s: Failed to send nullfunc to AP %pM"
2814                                     " after %dms, disconnecting.\n",
2815                                     sdata->name,
2816                                     bssid, probe_wait_ms);
2817 #endif
2818                         ieee80211_sta_connection_lost(sdata, bssid,
2819                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2820                 } else if (ifmgd->probe_send_count < max_tries) {
2821 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2822                         wiphy_debug(local->hw.wiphy,
2823                                     "%s: No probe response from AP %pM"
2824                                     " after %dms, try %d/%i\n",
2825                                     sdata->name,
2826                                     bssid, probe_wait_ms,
2827                                     ifmgd->probe_send_count, max_tries);
2828 #endif
2829                         ieee80211_mgd_probe_ap_send(sdata);
2830                 } else {
2831                         /*
2832                          * We actually lost the connection ... or did we?
2833                          * Let's make sure!
2834                          */
2835                         wiphy_debug(local->hw.wiphy,
2836                                     "%s: No probe response from AP %pM"
2837                                     " after %dms, disconnecting.\n",
2838                                     sdata->name,
2839                                     bssid, probe_wait_ms);
2840
2841                         ieee80211_sta_connection_lost(sdata, bssid,
2842                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2843                 }
2844         }
2845
2846         mutex_unlock(&ifmgd->mtx);
2847
2848         mutex_lock(&local->mtx);
2849         ieee80211_recalc_idle(local);
2850         mutex_unlock(&local->mtx);
2851 }
2852
2853 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2854 {
2855         struct ieee80211_sub_if_data *sdata =
2856                 (struct ieee80211_sub_if_data *) data;
2857         struct ieee80211_local *local = sdata->local;
2858
2859         if (local->quiescing)
2860                 return;
2861
2862         ieee80211_queue_work(&sdata->local->hw,
2863                              &sdata->u.mgd.beacon_connection_loss_work);
2864 }
2865
2866 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2867 {
2868         struct ieee80211_sub_if_data *sdata =
2869                 (struct ieee80211_sub_if_data *) data;
2870         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2871         struct ieee80211_local *local = sdata->local;
2872
2873         if (local->quiescing)
2874                 return;
2875
2876         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2877 }
2878
2879 static void ieee80211_sta_monitor_work(struct work_struct *work)
2880 {
2881         struct ieee80211_sub_if_data *sdata =
2882                 container_of(work, struct ieee80211_sub_if_data,
2883                              u.mgd.monitor_work);
2884
2885         ieee80211_mgd_probe_ap(sdata, false);
2886 }
2887
2888 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2889 {
2890         u32 flags;
2891
2892         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2893                 __ieee80211_stop_poll(sdata);
2894
2895                 /* let's probe the connection once */
2896                 flags = sdata->local->hw.flags;
2897                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
2898                         ieee80211_queue_work(&sdata->local->hw,
2899                                              &sdata->u.mgd.monitor_work);
2900                 /* and do all the other regular work too */
2901                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2902         }
2903 }
2904
2905 #ifdef CONFIG_PM
2906 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2907 {
2908         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2909
2910         /*
2911          * we need to use atomic bitops for the running bits
2912          * only because both timers might fire at the same
2913          * time -- the code here is properly synchronised.
2914          */
2915
2916         cancel_work_sync(&ifmgd->request_smps_work);
2917
2918         cancel_work_sync(&ifmgd->monitor_work);
2919         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2920         if (del_timer_sync(&ifmgd->timer))
2921                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2922
2923         cancel_work_sync(&ifmgd->chswitch_work);
2924         if (del_timer_sync(&ifmgd->chswitch_timer))
2925                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2926
2927         /* these will just be re-established on connection */
2928         del_timer_sync(&ifmgd->conn_mon_timer);
2929         del_timer_sync(&ifmgd->bcn_mon_timer);
2930 }
2931
2932 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2933 {
2934         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2935
2936         if (!ifmgd->associated)
2937                 return;
2938
2939         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
2940                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
2941                 mutex_lock(&ifmgd->mtx);
2942                 if (ifmgd->associated) {
2943 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2944                         wiphy_debug(sdata->local->hw.wiphy,
2945                                     "%s: driver requested disconnect after resume.\n",
2946                                     sdata->name);
2947 #endif
2948                         ieee80211_sta_connection_lost(sdata,
2949                                 ifmgd->associated->bssid,
2950                                 WLAN_REASON_UNSPECIFIED);
2951                         mutex_unlock(&ifmgd->mtx);
2952                         return;
2953                 }
2954                 mutex_unlock(&ifmgd->mtx);
2955         }
2956
2957         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2958                 add_timer(&ifmgd->timer);
2959         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2960                 add_timer(&ifmgd->chswitch_timer);
2961         ieee80211_sta_reset_beacon_monitor(sdata);
2962
2963         mutex_lock(&sdata->local->mtx);
2964         ieee80211_restart_sta_timer(sdata);
2965         mutex_unlock(&sdata->local->mtx);
2966 }
2967 #endif
2968
2969 /* interface setup */
2970 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2971 {
2972         struct ieee80211_if_managed *ifmgd;
2973
2974         ifmgd = &sdata->u.mgd;
2975         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2976         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2977         INIT_WORK(&ifmgd->beacon_connection_loss_work,
2978                   ieee80211_beacon_connection_loss_work);
2979         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
2980         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2981                     (unsigned long) sdata);
2982         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2983                     (unsigned long) sdata);
2984         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2985                     (unsigned long) sdata);
2986         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2987                     (unsigned long) sdata);
2988
2989         ifmgd->flags = 0;
2990         ifmgd->powersave = sdata->wdev.ps;
2991         ifmgd->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
2992         ifmgd->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
2993
2994         mutex_init(&ifmgd->mtx);
2995
2996         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
2997                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
2998         else
2999                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
3000 }
3001
3002 /* scan finished notification */
3003 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
3004 {
3005         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
3006
3007         /* Restart STA timers */
3008         rcu_read_lock();
3009         list_for_each_entry_rcu(sdata, &local->interfaces, list)
3010                 ieee80211_restart_sta_timer(sdata);
3011         rcu_read_unlock();
3012 }
3013
3014 int ieee80211_max_network_latency(struct notifier_block *nb,
3015                                   unsigned long data, void *dummy)
3016 {
3017         s32 latency_usec = (s32) data;
3018         struct ieee80211_local *local =
3019                 container_of(nb, struct ieee80211_local,
3020                              network_latency_notifier);
3021
3022         mutex_lock(&local->iflist_mtx);
3023         ieee80211_recalc_ps(local, latency_usec);
3024         mutex_unlock(&local->iflist_mtx);
3025
3026         return 0;
3027 }
3028
3029 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3030                                      struct cfg80211_bss *cbss, bool assoc)
3031 {
3032         struct ieee80211_local *local = sdata->local;
3033         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3034         struct ieee80211_bss *bss = (void *)cbss->priv;
3035         struct sta_info *sta;
3036         bool have_sta = false;
3037         int err;
3038         int ht_cfreq;
3039         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
3040         const u8 *ht_oper_ie;
3041         const struct ieee80211_ht_operation *ht_oper = NULL;
3042         struct ieee80211_supported_band *sband;
3043
3044         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3045                 return -EINVAL;
3046
3047         if (assoc) {
3048                 rcu_read_lock();
3049                 have_sta = sta_info_get(sdata, cbss->bssid);
3050                 rcu_read_unlock();
3051         }
3052
3053         if (!have_sta) {
3054                 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3055                 if (!sta)
3056                         return -ENOMEM;
3057         }
3058
3059         mutex_lock(&local->mtx);
3060         ieee80211_recalc_idle(sdata->local);
3061         mutex_unlock(&local->mtx);
3062
3063         /* switch to the right channel */
3064         sband = local->hw.wiphy->bands[cbss->channel->band];
3065
3066         ifmgd->flags &= ~IEEE80211_STA_DISABLE_40MHZ;
3067
3068         if (sband->ht_cap.ht_supported) {
3069                 ht_oper_ie = cfg80211_find_ie(WLAN_EID_HT_OPERATION,
3070                                               cbss->information_elements,
3071                                               cbss->len_information_elements);
3072                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3073                         ht_oper = (void *)(ht_oper_ie + 2);
3074         }
3075
3076         if (ht_oper) {
3077                 ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
3078                                                           cbss->channel->band);
3079                 /* check that channel matches the right operating channel */
3080                 if (cbss->channel->center_freq != ht_cfreq) {
3081                         /*
3082                          * It's possible that some APs are confused here;
3083                          * Netgear WNDR3700 sometimes reports 4 higher than
3084                          * the actual channel in association responses, but
3085                          * since we look at probe response/beacon data here
3086                          * it should be OK.
3087                          */
3088                         printk(KERN_DEBUG
3089                                "%s: Wrong control channel: center-freq: %d"
3090                                " ht-cfreq: %d ht->primary_chan: %d"
3091                                " band: %d. Disabling HT.\n",
3092                                sdata->name, cbss->channel->center_freq,
3093                                ht_cfreq, ht_oper->primary_chan,
3094                                cbss->channel->band);
3095                         ht_oper = NULL;
3096                 }
3097         }
3098
3099         if (ht_oper) {
3100                 channel_type = NL80211_CHAN_HT20;
3101
3102                 if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
3103                         switch (ht_oper->ht_param &
3104                                         IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
3105                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
3106                                 channel_type = NL80211_CHAN_HT40PLUS;
3107                                 break;
3108                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
3109                                 channel_type = NL80211_CHAN_HT40MINUS;
3110                                 break;
3111                         }
3112                 }
3113         }
3114
3115         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
3116                 /* can only fail due to HT40+/- mismatch */
3117                 channel_type = NL80211_CHAN_HT20;
3118                 printk(KERN_DEBUG
3119                        "%s: disabling 40 MHz due to multi-vif mismatch\n",
3120                        sdata->name);
3121                 ifmgd->flags |= IEEE80211_STA_DISABLE_40MHZ;
3122                 WARN_ON(!ieee80211_set_channel_type(local, sdata,
3123                                                     channel_type));
3124         }
3125
3126         local->oper_channel = cbss->channel;
3127         ieee80211_hw_config(local, 0);
3128
3129         if (!have_sta) {
3130                 u32 rates = 0, basic_rates = 0;
3131                 bool have_higher_than_11mbit;
3132                 int min_rate = INT_MAX, min_rate_index = -1;
3133
3134                 ieee80211_get_rates(sband, bss->supp_rates,
3135                                     bss->supp_rates_len,
3136                                     &rates, &basic_rates,
3137                                     &have_higher_than_11mbit,
3138                                     &min_rate, &min_rate_index);
3139
3140                 /*
3141                  * This used to be a workaround for basic rates missing
3142                  * in the association response frame. Now that we no
3143                  * longer use the basic rates from there, it probably
3144                  * doesn't happen any more, but keep the workaround so
3145                  * in case some *other* APs are buggy in different ways
3146                  * we can connect -- with a warning.
3147                  */
3148                 if (!basic_rates && min_rate_index >= 0) {
3149                         printk(KERN_DEBUG
3150                                "%s: No basic rates, using min rate instead.\n",
3151                                sdata->name);
3152                         basic_rates = BIT(min_rate_index);
3153                 }
3154
3155                 sta->sta.supp_rates[cbss->channel->band] = rates;
3156                 sdata->vif.bss_conf.basic_rates = basic_rates;
3157
3158                 /* cf. IEEE 802.11 9.2.12 */
3159                 if (local->oper_channel->band == IEEE80211_BAND_2GHZ &&
3160                     have_higher_than_11mbit)
3161                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
3162                 else
3163                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
3164
3165                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
3166
3167                 /* tell driver about BSSID and basic rates */
3168                 ieee80211_bss_info_change_notify(sdata,
3169                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES);
3170
3171                 if (assoc)
3172                         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
3173
3174                 err = sta_info_insert(sta);
3175                 sta = NULL;
3176                 if (err) {
3177                         printk(KERN_DEBUG
3178                                "%s: failed to insert STA entry for the AP (error %d)\n",
3179                                sdata->name, err);
3180                         return err;
3181                 }
3182         } else
3183                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
3184
3185         return 0;
3186 }
3187
3188 /* config hooks */
3189 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
3190                        struct cfg80211_auth_request *req)
3191 {
3192         struct ieee80211_local *local = sdata->local;
3193         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3194         struct ieee80211_mgd_auth_data *auth_data;
3195         u16 auth_alg;
3196         int err;
3197
3198         /* prepare auth data structure */
3199
3200         switch (req->auth_type) {
3201         case NL80211_AUTHTYPE_OPEN_SYSTEM:
3202                 auth_alg = WLAN_AUTH_OPEN;
3203                 break;
3204         case NL80211_AUTHTYPE_SHARED_KEY:
3205                 if (IS_ERR(local->wep_tx_tfm))
3206                         return -EOPNOTSUPP;
3207                 auth_alg = WLAN_AUTH_SHARED_KEY;
3208                 break;
3209         case NL80211_AUTHTYPE_FT:
3210                 auth_alg = WLAN_AUTH_FT;
3211                 break;
3212         case NL80211_AUTHTYPE_NETWORK_EAP:
3213                 auth_alg = WLAN_AUTH_LEAP;
3214                 break;
3215         default:
3216                 return -EOPNOTSUPP;
3217         }
3218
3219         auth_data = kzalloc(sizeof(*auth_data) + req->ie_len, GFP_KERNEL);
3220         if (!auth_data)
3221                 return -ENOMEM;
3222
3223         auth_data->bss = req->bss;
3224
3225         if (req->ie && req->ie_len) {
3226                 memcpy(auth_data->ie, req->ie, req->ie_len);
3227                 auth_data->ie_len = req->ie_len;
3228         }
3229
3230         if (req->key && req->key_len) {
3231                 auth_data->key_len = req->key_len;
3232                 auth_data->key_idx = req->key_idx;
3233                 memcpy(auth_data->key, req->key, req->key_len);
3234         }
3235
3236         auth_data->algorithm = auth_alg;
3237
3238         /* try to authenticate/probe */
3239
3240         mutex_lock(&ifmgd->mtx);
3241
3242         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
3243             ifmgd->assoc_data) {
3244                 err = -EBUSY;
3245                 goto err_free;
3246         }
3247
3248         if (ifmgd->auth_data)
3249                 ieee80211_destroy_auth_data(sdata, false);
3250
3251         /* prep auth_data so we don't go into idle on disassoc */
3252         ifmgd->auth_data = auth_data;
3253
3254         if (ifmgd->associated)
3255                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3256
3257         printk(KERN_DEBUG "%s: authenticate with %pM\n",
3258                sdata->name, req->bss->bssid);
3259
3260         err = ieee80211_prep_connection(sdata, req->bss, false);
3261         if (err)
3262                 goto err_clear;
3263
3264         err = ieee80211_probe_auth(sdata);
3265         if (err) {
3266                 sta_info_destroy_addr(sdata, req->bss->bssid);
3267                 goto err_clear;
3268         }
3269
3270         /* hold our own reference */
3271         cfg80211_ref_bss(auth_data->bss);
3272         err = 0;
3273         goto out_unlock;
3274
3275  err_clear:
3276         ifmgd->auth_data = NULL;
3277  err_free:
3278         kfree(auth_data);
3279  out_unlock:
3280         mutex_unlock(&ifmgd->mtx);
3281
3282         return err;
3283 }
3284
3285 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
3286                         struct cfg80211_assoc_request *req)
3287 {
3288         struct ieee80211_local *local = sdata->local;
3289         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3290         struct ieee80211_bss *bss = (void *)req->bss->priv;
3291         struct ieee80211_mgd_assoc_data *assoc_data;
3292         struct ieee80211_supported_band *sband;
3293         const u8 *ssidie;
3294         int i, err;
3295
3296         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
3297         if (!ssidie)
3298                 return -EINVAL;
3299
3300         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
3301         if (!assoc_data)
3302                 return -ENOMEM;
3303
3304         mutex_lock(&ifmgd->mtx);
3305
3306         if (ifmgd->associated)
3307                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3308
3309         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
3310                 err = -EBUSY;
3311                 goto err_free;
3312         }
3313
3314         if (ifmgd->assoc_data) {
3315                 err = -EBUSY;
3316                 goto err_free;
3317         }
3318
3319         if (ifmgd->auth_data) {
3320                 bool match;
3321
3322                 /* keep sta info, bssid if matching */
3323                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
3324                 ieee80211_destroy_auth_data(sdata, match);
3325         }
3326
3327         /* prepare assoc data */
3328
3329         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
3330         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
3331
3332         ifmgd->beacon_crc_valid = false;
3333
3334         /*
3335          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
3336          * We still associate in non-HT mode (11a/b/g) if any one of these
3337          * ciphers is configured as pairwise.
3338          * We can set this to true for non-11n hardware, that'll be checked
3339          * separately along with the peer capabilities.
3340          */
3341         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
3342                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
3343                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
3344                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
3345                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3346
3347         if (req->flags & ASSOC_REQ_DISABLE_HT)
3348                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3349
3350         /* Also disable HT if we don't support it or the AP doesn't use WMM */
3351         sband = local->hw.wiphy->bands[req->bss->channel->band];
3352         if (!sband->ht_cap.ht_supported ||
3353             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used)
3354                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3355
3356         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
3357         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
3358                sizeof(ifmgd->ht_capa_mask));
3359
3360         if (req->ie && req->ie_len) {
3361                 memcpy(assoc_data->ie, req->ie, req->ie_len);
3362                 assoc_data->ie_len = req->ie_len;
3363         }
3364
3365         assoc_data->bss = req->bss;
3366
3367         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
3368                 if (ifmgd->powersave)
3369                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
3370                 else
3371                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
3372         } else
3373                 ifmgd->ap_smps = ifmgd->req_smps;
3374
3375         assoc_data->capability = req->bss->capability;
3376         assoc_data->wmm = bss->wmm_used &&
3377                           (local->hw.queues >= IEEE80211_NUM_ACS);
3378         assoc_data->supp_rates = bss->supp_rates;
3379         assoc_data->supp_rates_len = bss->supp_rates_len;
3380         assoc_data->ht_operation_ie =
3381                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
3382
3383         if (bss->wmm_used && bss->uapsd_supported &&
3384             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
3385                 assoc_data->uapsd = true;
3386                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
3387         } else {
3388                 assoc_data->uapsd = false;
3389                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
3390         }
3391
3392         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
3393         assoc_data->ssid_len = ssidie[1];
3394
3395         if (req->prev_bssid)
3396                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
3397
3398         if (req->use_mfp) {
3399                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
3400                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
3401         } else {
3402                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
3403                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
3404         }
3405
3406         if (req->crypto.control_port)
3407                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
3408         else
3409                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
3410
3411         sdata->control_port_protocol = req->crypto.control_port_ethertype;
3412         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
3413
3414         /* kick off associate process */
3415
3416         ifmgd->assoc_data = assoc_data;
3417
3418         err = ieee80211_prep_connection(sdata, req->bss, true);
3419         if (err)
3420                 goto err_clear;
3421
3422         if (!bss->dtim_period &&
3423             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) {
3424                 /*
3425                  * Wait up to one beacon interval ...
3426                  * should this be more if we miss one?
3427                  */
3428                 printk(KERN_DEBUG "%s: waiting for beacon from %pM\n",
3429                        sdata->name, ifmgd->bssid);
3430                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
3431         } else {
3432                 assoc_data->have_beacon = true;
3433                 assoc_data->sent_assoc = false;
3434                 assoc_data->timeout = jiffies;
3435         }
3436         run_again(ifmgd, assoc_data->timeout);
3437
3438         if (bss->corrupt_data) {
3439                 char *corrupt_type = "data";
3440                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
3441                         if (bss->corrupt_data &
3442                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
3443                                 corrupt_type = "beacon and probe response";
3444                         else
3445                                 corrupt_type = "beacon";
3446                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
3447                         corrupt_type = "probe response";
3448                 printk(KERN_DEBUG "%s: associating with AP with corrupt %s\n",
3449                        sdata->name, corrupt_type);
3450         }
3451
3452         err = 0;
3453         goto out;
3454  err_clear:
3455         ifmgd->assoc_data = NULL;
3456  err_free:
3457         kfree(assoc_data);
3458  out:
3459         mutex_unlock(&ifmgd->mtx);
3460
3461         return err;
3462 }
3463
3464 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
3465                          struct cfg80211_deauth_request *req)
3466 {
3467         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3468         u8 frame_buf[DEAUTH_DISASSOC_LEN];
3469
3470         mutex_lock(&ifmgd->mtx);
3471
3472         if (ifmgd->auth_data) {
3473                 ieee80211_destroy_auth_data(sdata, false);
3474                 mutex_unlock(&ifmgd->mtx);
3475                 return 0;
3476         }
3477
3478         printk(KERN_DEBUG
3479                "%s: deauthenticating from %pM by local choice (reason=%d)\n",
3480                sdata->name, req->bssid, req->reason_code);
3481
3482         if (ifmgd->associated &&
3483             ether_addr_equal(ifmgd->associated->bssid, req->bssid))
3484                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3485                                        req->reason_code, true, frame_buf);
3486         else
3487                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
3488                                                IEEE80211_STYPE_DEAUTH,
3489                                                req->reason_code, true,
3490                                                frame_buf);
3491         mutex_unlock(&ifmgd->mtx);
3492
3493         __cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3494
3495         mutex_lock(&sdata->local->mtx);
3496         ieee80211_recalc_idle(sdata->local);
3497         mutex_unlock(&sdata->local->mtx);
3498
3499         return 0;
3500 }
3501
3502 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
3503                            struct cfg80211_disassoc_request *req)
3504 {
3505         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3506         u8 bssid[ETH_ALEN];
3507         u8 frame_buf[DEAUTH_DISASSOC_LEN];
3508
3509         mutex_lock(&ifmgd->mtx);
3510
3511         /*
3512          * cfg80211 should catch this ... but it's racy since
3513          * we can receive a disassoc frame, process it, hand it
3514          * to cfg80211 while that's in a locked section already
3515          * trying to tell us that the user wants to disconnect.
3516          */
3517         if (ifmgd->associated != req->bss) {
3518                 mutex_unlock(&ifmgd->mtx);
3519                 return -ENOLINK;
3520         }
3521
3522         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
3523                sdata->name, req->bss->bssid, req->reason_code);
3524
3525         memcpy(bssid, req->bss->bssid, ETH_ALEN);
3526         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
3527                                req->reason_code, !req->local_state_change,
3528                                frame_buf);
3529         mutex_unlock(&ifmgd->mtx);
3530
3531         __cfg80211_send_disassoc(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3532
3533         mutex_lock(&sdata->local->mtx);
3534         ieee80211_recalc_idle(sdata->local);
3535         mutex_unlock(&sdata->local->mtx);
3536
3537         return 0;
3538 }
3539
3540 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
3541 {
3542         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3543
3544         mutex_lock(&ifmgd->mtx);
3545         if (ifmgd->assoc_data)
3546                 ieee80211_destroy_assoc_data(sdata, false);
3547         if (ifmgd->auth_data)
3548                 ieee80211_destroy_auth_data(sdata, false);
3549         del_timer_sync(&ifmgd->timer);
3550         mutex_unlock(&ifmgd->mtx);
3551 }
3552
3553 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
3554                                enum nl80211_cqm_rssi_threshold_event rssi_event,
3555                                gfp_t gfp)
3556 {
3557         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3558
3559         trace_api_cqm_rssi_notify(sdata, rssi_event);
3560
3561         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
3562 }
3563 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
3564
3565 unsigned char ieee80211_get_operstate(struct ieee80211_vif *vif)
3566 {
3567         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3568         return sdata->dev->operstate;
3569 }
3570 EXPORT_SYMBOL(ieee80211_get_operstate);