mac80211: improve/fix mlme messages
[linux-2.6.git] / net / mac80211 / mlme.c
1 /*
2  * BSS client mode implementation
3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4  * Copyright 2004, Instant802 Networks, Inc.
5  * Copyright 2005, Devicescape Software, Inc.
6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License version 2 as
11  * published by the Free Software Foundation.
12  */
13
14 #include <linux/delay.h>
15 #include <linux/if_ether.h>
16 #include <linux/skbuff.h>
17 #include <linux/if_arp.h>
18 #include <linux/etherdevice.h>
19 #include <linux/rtnetlink.h>
20 #include <linux/pm_qos_params.h>
21 #include <linux/crc32.h>
22 #include <net/mac80211.h>
23 #include <asm/unaligned.h>
24
25 #include "ieee80211_i.h"
26 #include "driver-ops.h"
27 #include "rate.h"
28 #include "led.h"
29
30 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
31 #define IEEE80211_AUTH_MAX_TRIES 3
32 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
33 #define IEEE80211_ASSOC_MAX_TRIES 3
34 #define IEEE80211_MAX_PROBE_TRIES 5
35
36 /*
37  * beacon loss detection timeout
38  * XXX: should depend on beacon interval
39  */
40 #define IEEE80211_BEACON_LOSS_TIME      (2 * HZ)
41 /*
42  * Time the connection can be idle before we probe
43  * it to see if we can still talk to the AP.
44  */
45 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
46 /*
47  * Time we wait for a probe response after sending
48  * a probe request because of beacon loss or for
49  * checking the connection still works.
50  */
51 #define IEEE80211_PROBE_WAIT            (HZ / 2)
52
53 #define TMR_RUNNING_TIMER       0
54 #define TMR_RUNNING_CHANSW      1
55
56 /*
57  * All cfg80211 functions have to be called outside a locked
58  * section so that they can acquire a lock themselves... This
59  * is much simpler than queuing up things in cfg80211, but we
60  * do need some indirection for that here.
61  */
62 enum rx_mgmt_action {
63         /* no action required */
64         RX_MGMT_NONE,
65
66         /* caller must call cfg80211_send_rx_auth() */
67         RX_MGMT_CFG80211_AUTH,
68
69         /* caller must call cfg80211_send_rx_assoc() */
70         RX_MGMT_CFG80211_ASSOC,
71
72         /* caller must call cfg80211_send_deauth() */
73         RX_MGMT_CFG80211_DEAUTH,
74
75         /* caller must call cfg80211_send_disassoc() */
76         RX_MGMT_CFG80211_DISASSOC,
77
78         /* caller must call cfg80211_auth_timeout() & free work */
79         RX_MGMT_CFG80211_AUTH_TO,
80
81         /* caller must call cfg80211_assoc_timeout() & free work */
82         RX_MGMT_CFG80211_ASSOC_TO,
83 };
84
85 /* utils */
86 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
87 {
88         WARN_ON(!mutex_is_locked(&ifmgd->mtx));
89 }
90
91 /*
92  * We can have multiple work items (and connection probing)
93  * scheduling this timer, but we need to take care to only
94  * reschedule it when it should fire _earlier_ than it was
95  * asked for before, or if it's not pending right now. This
96  * function ensures that. Note that it then is required to
97  * run this function for all timeouts after the first one
98  * has happened -- the work that runs from this timer will
99  * do that.
100  */
101 static void run_again(struct ieee80211_if_managed *ifmgd,
102                              unsigned long timeout)
103 {
104         ASSERT_MGD_MTX(ifmgd);
105
106         if (!timer_pending(&ifmgd->timer) ||
107             time_before(timeout, ifmgd->timer.expires))
108                 mod_timer(&ifmgd->timer, timeout);
109 }
110
111 static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata)
112 {
113         if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
114                 return;
115
116         mod_timer(&sdata->u.mgd.bcn_mon_timer,
117                   round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME));
118 }
119
120 static int ecw2cw(int ecw)
121 {
122         return (1 << ecw) - 1;
123 }
124
125 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
126                                       struct ieee80211_supported_band *sband,
127                                       u32 *rates)
128 {
129         int i, j, count;
130         *rates = 0;
131         count = 0;
132         for (i = 0; i < bss->supp_rates_len; i++) {
133                 int rate = (bss->supp_rates[i] & 0x7F) * 5;
134
135                 for (j = 0; j < sband->n_bitrates; j++)
136                         if (sband->bitrates[j].bitrate == rate) {
137                                 *rates |= BIT(j);
138                                 count++;
139                                 break;
140                         }
141         }
142
143         return count;
144 }
145
146 /*
147  * ieee80211_enable_ht should be called only after the operating band
148  * has been determined as ht configuration depends on the hw's
149  * HT abilities for a specific band.
150  */
151 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
152                                struct ieee80211_ht_info *hti,
153                                const u8 *bssid, u16 ap_ht_cap_flags)
154 {
155         struct ieee80211_local *local = sdata->local;
156         struct ieee80211_supported_band *sband;
157         struct sta_info *sta;
158         u32 changed = 0;
159         u16 ht_opmode;
160         bool enable_ht = true, ht_changed;
161         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
162
163         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
164
165         /* HT is not supported */
166         if (!sband->ht_cap.ht_supported)
167                 enable_ht = false;
168
169         /* check that channel matches the right operating channel */
170         if (local->hw.conf.channel->center_freq !=
171             ieee80211_channel_to_frequency(hti->control_chan))
172                 enable_ht = false;
173
174         if (enable_ht) {
175                 channel_type = NL80211_CHAN_HT20;
176
177                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
178                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
179                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
180                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
181                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
182                                 if (!(local->hw.conf.channel->flags &
183                                     IEEE80211_CHAN_NO_HT40PLUS))
184                                         channel_type = NL80211_CHAN_HT40PLUS;
185                                 break;
186                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
187                                 if (!(local->hw.conf.channel->flags &
188                                     IEEE80211_CHAN_NO_HT40MINUS))
189                                         channel_type = NL80211_CHAN_HT40MINUS;
190                                 break;
191                         }
192                 }
193         }
194
195         ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
196                      channel_type != local->hw.conf.channel_type;
197
198         local->oper_channel_type = channel_type;
199
200         if (ht_changed) {
201                 /* channel_type change automatically detected */
202                 ieee80211_hw_config(local, 0);
203
204                 rcu_read_lock();
205                 sta = sta_info_get(local, bssid);
206                 if (sta)
207                         rate_control_rate_update(local, sband, sta,
208                                                  IEEE80211_RC_HT_CHANGED);
209                 rcu_read_unlock();
210         }
211
212         /* disable HT */
213         if (!enable_ht)
214                 return 0;
215
216         ht_opmode = le16_to_cpu(hti->operation_mode);
217
218         /* if bss configuration changed store the new one */
219         if (!sdata->ht_opmode_valid ||
220             sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
221                 changed |= BSS_CHANGED_HT;
222                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
223                 sdata->ht_opmode_valid = true;
224         }
225
226         return changed;
227 }
228
229 /* frame sending functions */
230
231 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
232                                  struct ieee80211_mgd_work *wk)
233 {
234         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
235         struct ieee80211_local *local = sdata->local;
236         struct sk_buff *skb;
237         struct ieee80211_mgmt *mgmt;
238         u8 *pos;
239         const u8 *ies, *ht_ie;
240         int i, len, count, rates_len, supp_rates_len;
241         u16 capab;
242         int wmm = 0;
243         struct ieee80211_supported_band *sband;
244         u32 rates = 0;
245
246         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
247                             sizeof(*mgmt) + 200 + wk->ie_len +
248                             wk->ssid_len);
249         if (!skb) {
250                 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
251                        "frame\n", sdata->dev->name);
252                 return;
253         }
254         skb_reserve(skb, local->hw.extra_tx_headroom);
255
256         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
257
258         capab = ifmgd->capab;
259
260         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
261                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
262                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
263                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
264                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
265         }
266
267         if (wk->bss->cbss.capability & WLAN_CAPABILITY_PRIVACY)
268                 capab |= WLAN_CAPABILITY_PRIVACY;
269         if (wk->bss->wmm_used)
270                 wmm = 1;
271
272         /* get all rates supported by the device and the AP as
273          * some APs don't like getting a superset of their rates
274          * in the association request (e.g. D-Link DAP 1353 in
275          * b-only mode) */
276         rates_len = ieee80211_compatible_rates(wk->bss, sband, &rates);
277
278         if ((wk->bss->cbss.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
279             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
280                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
281
282         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
283         memset(mgmt, 0, 24);
284         memcpy(mgmt->da, wk->bss->cbss.bssid, ETH_ALEN);
285         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
286         memcpy(mgmt->bssid, wk->bss->cbss.bssid, ETH_ALEN);
287
288         if (!is_zero_ether_addr(wk->prev_bssid)) {
289                 skb_put(skb, 10);
290                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
291                                                   IEEE80211_STYPE_REASSOC_REQ);
292                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
293                 mgmt->u.reassoc_req.listen_interval =
294                                 cpu_to_le16(local->hw.conf.listen_interval);
295                 memcpy(mgmt->u.reassoc_req.current_ap, wk->prev_bssid,
296                        ETH_ALEN);
297         } else {
298                 skb_put(skb, 4);
299                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
300                                                   IEEE80211_STYPE_ASSOC_REQ);
301                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
302                 mgmt->u.assoc_req.listen_interval =
303                                 cpu_to_le16(local->hw.conf.listen_interval);
304         }
305
306         /* SSID */
307         ies = pos = skb_put(skb, 2 + wk->ssid_len);
308         *pos++ = WLAN_EID_SSID;
309         *pos++ = wk->ssid_len;
310         memcpy(pos, wk->ssid, wk->ssid_len);
311
312         /* add all rates which were marked to be used above */
313         supp_rates_len = rates_len;
314         if (supp_rates_len > 8)
315                 supp_rates_len = 8;
316
317         len = sband->n_bitrates;
318         pos = skb_put(skb, supp_rates_len + 2);
319         *pos++ = WLAN_EID_SUPP_RATES;
320         *pos++ = supp_rates_len;
321
322         count = 0;
323         for (i = 0; i < sband->n_bitrates; i++) {
324                 if (BIT(i) & rates) {
325                         int rate = sband->bitrates[i].bitrate;
326                         *pos++ = (u8) (rate / 5);
327                         if (++count == 8)
328                                 break;
329                 }
330         }
331
332         if (rates_len > count) {
333                 pos = skb_put(skb, rates_len - count + 2);
334                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
335                 *pos++ = rates_len - count;
336
337                 for (i++; i < sband->n_bitrates; i++) {
338                         if (BIT(i) & rates) {
339                                 int rate = sband->bitrates[i].bitrate;
340                                 *pos++ = (u8) (rate / 5);
341                         }
342                 }
343         }
344
345         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
346                 /* 1. power capabilities */
347                 pos = skb_put(skb, 4);
348                 *pos++ = WLAN_EID_PWR_CAPABILITY;
349                 *pos++ = 2;
350                 *pos++ = 0; /* min tx power */
351                 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
352
353                 /* 2. supported channels */
354                 /* TODO: get this in reg domain format */
355                 pos = skb_put(skb, 2 * sband->n_channels + 2);
356                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
357                 *pos++ = 2 * sband->n_channels;
358                 for (i = 0; i < sband->n_channels; i++) {
359                         *pos++ = ieee80211_frequency_to_channel(
360                                         sband->channels[i].center_freq);
361                         *pos++ = 1; /* one channel in the subband*/
362                 }
363         }
364
365         if (wk->ie_len && wk->ie) {
366                 pos = skb_put(skb, wk->ie_len);
367                 memcpy(pos, wk->ie, wk->ie_len);
368         }
369
370         if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED)) {
371                 pos = skb_put(skb, 9);
372                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
373                 *pos++ = 7; /* len */
374                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
375                 *pos++ = 0x50;
376                 *pos++ = 0xf2;
377                 *pos++ = 2; /* WME */
378                 *pos++ = 0; /* WME info */
379                 *pos++ = 1; /* WME ver */
380                 *pos++ = 0;
381         }
382
383         /* wmm support is a must to HT */
384         /*
385          * IEEE802.11n does not allow TKIP/WEP as pairwise
386          * ciphers in HT mode. We still associate in non-ht
387          * mode (11a/b/g) if any one of these ciphers is
388          * configured as pairwise.
389          */
390         if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
391             sband->ht_cap.ht_supported &&
392             (ht_ie = ieee80211_bss_get_ie(&wk->bss->cbss, WLAN_EID_HT_INFORMATION)) &&
393             ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
394             (!(ifmgd->flags & IEEE80211_STA_DISABLE_11N))) {
395                 struct ieee80211_ht_info *ht_info =
396                         (struct ieee80211_ht_info *)(ht_ie + 2);
397                 u16 cap = sband->ht_cap.cap;
398                 __le16 tmp;
399                 u32 flags = local->hw.conf.channel->flags;
400
401                 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
402                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
403                         if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
404                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
405                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
406                         }
407                         break;
408                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
409                         if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
410                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
411                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
412                         }
413                         break;
414                 }
415
416                 tmp = cpu_to_le16(cap);
417                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
418                 *pos++ = WLAN_EID_HT_CAPABILITY;
419                 *pos++ = sizeof(struct ieee80211_ht_cap);
420                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
421                 memcpy(pos, &tmp, sizeof(u16));
422                 pos += sizeof(u16);
423                 /* TODO: needs a define here for << 2 */
424                 *pos++ = sband->ht_cap.ampdu_factor |
425                          (sband->ht_cap.ampdu_density << 2);
426                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
427         }
428
429         ieee80211_tx_skb(sdata, skb, 0);
430 }
431
432
433 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
434                                            const u8 *bssid, u16 stype, u16 reason,
435                                            void *cookie)
436 {
437         struct ieee80211_local *local = sdata->local;
438         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
439         struct sk_buff *skb;
440         struct ieee80211_mgmt *mgmt;
441
442         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
443         if (!skb) {
444                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
445                        "deauth/disassoc frame\n", sdata->dev->name);
446                 return;
447         }
448         skb_reserve(skb, local->hw.extra_tx_headroom);
449
450         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
451         memset(mgmt, 0, 24);
452         memcpy(mgmt->da, bssid, ETH_ALEN);
453         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
454         memcpy(mgmt->bssid, bssid, ETH_ALEN);
455         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
456         skb_put(skb, 2);
457         /* u.deauth.reason_code == u.disassoc.reason_code */
458         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
459
460         if (stype == IEEE80211_STYPE_DEAUTH)
461                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len, cookie);
462         else
463                 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len, cookie);
464         ieee80211_tx_skb(sdata, skb, ifmgd->flags & IEEE80211_STA_MFP_ENABLED);
465 }
466
467 void ieee80211_send_pspoll(struct ieee80211_local *local,
468                            struct ieee80211_sub_if_data *sdata)
469 {
470         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
471         struct ieee80211_pspoll *pspoll;
472         struct sk_buff *skb;
473         u16 fc;
474
475         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
476         if (!skb) {
477                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
478                        "pspoll frame\n", sdata->dev->name);
479                 return;
480         }
481         skb_reserve(skb, local->hw.extra_tx_headroom);
482
483         pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
484         memset(pspoll, 0, sizeof(*pspoll));
485         fc = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL | IEEE80211_FCTL_PM;
486         pspoll->frame_control = cpu_to_le16(fc);
487         pspoll->aid = cpu_to_le16(ifmgd->aid);
488
489         /* aid in PS-Poll has its two MSBs each set to 1 */
490         pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
491
492         memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
493         memcpy(pspoll->ta, sdata->dev->dev_addr, ETH_ALEN);
494
495         ieee80211_tx_skb(sdata, skb, 0);
496 }
497
498 void ieee80211_send_nullfunc(struct ieee80211_local *local,
499                              struct ieee80211_sub_if_data *sdata,
500                              int powersave)
501 {
502         struct sk_buff *skb;
503         struct ieee80211_hdr *nullfunc;
504         __le16 fc;
505
506         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
507                 return;
508
509         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
510         if (!skb) {
511                 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
512                        "frame\n", sdata->dev->name);
513                 return;
514         }
515         skb_reserve(skb, local->hw.extra_tx_headroom);
516
517         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
518         memset(nullfunc, 0, 24);
519         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
520                          IEEE80211_FCTL_TODS);
521         if (powersave)
522                 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
523         nullfunc->frame_control = fc;
524         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
525         memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
526         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
527
528         ieee80211_tx_skb(sdata, skb, 0);
529 }
530
531 /* spectrum management related things */
532 static void ieee80211_chswitch_work(struct work_struct *work)
533 {
534         struct ieee80211_sub_if_data *sdata =
535                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
536         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
537
538         if (!netif_running(sdata->dev))
539                 return;
540
541         mutex_lock(&ifmgd->mtx);
542         if (!ifmgd->associated)
543                 goto out;
544
545         sdata->local->oper_channel = sdata->local->csa_channel;
546         ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL);
547
548         /* XXX: shouldn't really modify cfg80211-owned data! */
549         ifmgd->associated->cbss.channel = sdata->local->oper_channel;
550
551         ieee80211_wake_queues_by_reason(&sdata->local->hw,
552                                         IEEE80211_QUEUE_STOP_REASON_CSA);
553  out:
554         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
555         mutex_unlock(&ifmgd->mtx);
556 }
557
558 static void ieee80211_chswitch_timer(unsigned long data)
559 {
560         struct ieee80211_sub_if_data *sdata =
561                 (struct ieee80211_sub_if_data *) data;
562         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
563
564         if (sdata->local->quiescing) {
565                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
566                 return;
567         }
568
569         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
570 }
571
572 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
573                                       struct ieee80211_channel_sw_ie *sw_elem,
574                                       struct ieee80211_bss *bss)
575 {
576         struct ieee80211_channel *new_ch;
577         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
578         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
579
580         ASSERT_MGD_MTX(ifmgd);
581
582         if (!ifmgd->associated)
583                 return;
584
585         if (sdata->local->scanning)
586                 return;
587
588         /* Disregard subsequent beacons if we are already running a timer
589            processing a CSA */
590
591         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
592                 return;
593
594         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
595         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
596                 return;
597
598         sdata->local->csa_channel = new_ch;
599
600         if (sw_elem->count <= 1) {
601                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
602         } else {
603                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
604                                         IEEE80211_QUEUE_STOP_REASON_CSA);
605                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
606                 mod_timer(&ifmgd->chswitch_timer,
607                           jiffies +
608                           msecs_to_jiffies(sw_elem->count *
609                                            bss->cbss.beacon_interval));
610         }
611 }
612
613 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
614                                         u16 capab_info, u8 *pwr_constr_elem,
615                                         u8 pwr_constr_elem_len)
616 {
617         struct ieee80211_conf *conf = &sdata->local->hw.conf;
618
619         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
620                 return;
621
622         /* Power constraint IE length should be 1 octet */
623         if (pwr_constr_elem_len != 1)
624                 return;
625
626         if ((*pwr_constr_elem <= conf->channel->max_power) &&
627             (*pwr_constr_elem != sdata->local->power_constr_level)) {
628                 sdata->local->power_constr_level = *pwr_constr_elem;
629                 ieee80211_hw_config(sdata->local, 0);
630         }
631 }
632
633 /* powersave */
634 static void ieee80211_enable_ps(struct ieee80211_local *local,
635                                 struct ieee80211_sub_if_data *sdata)
636 {
637         struct ieee80211_conf *conf = &local->hw.conf;
638
639         /*
640          * If we are scanning right now then the parameters will
641          * take effect when scan finishes.
642          */
643         if (local->scanning)
644                 return;
645
646         if (conf->dynamic_ps_timeout > 0 &&
647             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
648                 mod_timer(&local->dynamic_ps_timer, jiffies +
649                           msecs_to_jiffies(conf->dynamic_ps_timeout));
650         } else {
651                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
652                         ieee80211_send_nullfunc(local, sdata, 1);
653                 conf->flags |= IEEE80211_CONF_PS;
654                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
655         }
656 }
657
658 static void ieee80211_change_ps(struct ieee80211_local *local)
659 {
660         struct ieee80211_conf *conf = &local->hw.conf;
661
662         if (local->ps_sdata) {
663                 ieee80211_enable_ps(local, local->ps_sdata);
664         } else if (conf->flags & IEEE80211_CONF_PS) {
665                 conf->flags &= ~IEEE80211_CONF_PS;
666                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
667                 del_timer_sync(&local->dynamic_ps_timer);
668                 cancel_work_sync(&local->dynamic_ps_enable_work);
669         }
670 }
671
672 /* need to hold RTNL or interface lock */
673 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
674 {
675         struct ieee80211_sub_if_data *sdata, *found = NULL;
676         int count = 0;
677
678         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
679                 local->ps_sdata = NULL;
680                 return;
681         }
682
683         list_for_each_entry(sdata, &local->interfaces, list) {
684                 if (!netif_running(sdata->dev))
685                         continue;
686                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
687                         continue;
688                 found = sdata;
689                 count++;
690         }
691
692         if (count == 1 && found->u.mgd.powersave &&
693             found->u.mgd.associated && list_empty(&found->u.mgd.work_list) &&
694             !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
695                                     IEEE80211_STA_CONNECTION_POLL))) {
696                 s32 beaconint_us;
697
698                 if (latency < 0)
699                         latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
700
701                 beaconint_us = ieee80211_tu_to_usec(
702                                         found->vif.bss_conf.beacon_int);
703
704                 if (beaconint_us > latency) {
705                         local->ps_sdata = NULL;
706                 } else {
707                         u8 dtimper = found->vif.bss_conf.dtim_period;
708                         int maxslp = 1;
709
710                         if (dtimper > 1)
711                                 maxslp = min_t(int, dtimper,
712                                                     latency / beaconint_us);
713
714                         local->hw.conf.max_sleep_period = maxslp;
715                         local->ps_sdata = found;
716                 }
717         } else {
718                 local->ps_sdata = NULL;
719         }
720
721         ieee80211_change_ps(local);
722 }
723
724 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
725 {
726         struct ieee80211_local *local =
727                 container_of(work, struct ieee80211_local,
728                              dynamic_ps_disable_work);
729
730         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
731                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
732                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
733         }
734
735         ieee80211_wake_queues_by_reason(&local->hw,
736                                         IEEE80211_QUEUE_STOP_REASON_PS);
737 }
738
739 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
740 {
741         struct ieee80211_local *local =
742                 container_of(work, struct ieee80211_local,
743                              dynamic_ps_enable_work);
744         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
745
746         /* can only happen when PS was just disabled anyway */
747         if (!sdata)
748                 return;
749
750         if (local->hw.conf.flags & IEEE80211_CONF_PS)
751                 return;
752
753         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
754                 ieee80211_send_nullfunc(local, sdata, 1);
755
756         local->hw.conf.flags |= IEEE80211_CONF_PS;
757         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
758 }
759
760 void ieee80211_dynamic_ps_timer(unsigned long data)
761 {
762         struct ieee80211_local *local = (void *) data;
763
764         if (local->quiescing || local->suspended)
765                 return;
766
767         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
768 }
769
770 /* MLME */
771 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
772                                      struct ieee80211_if_managed *ifmgd,
773                                      u8 *wmm_param, size_t wmm_param_len)
774 {
775         struct ieee80211_tx_queue_params params;
776         size_t left;
777         int count;
778         u8 *pos;
779
780         if (!(ifmgd->flags & IEEE80211_STA_WMM_ENABLED))
781                 return;
782
783         if (!wmm_param)
784                 return;
785
786         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
787                 return;
788         count = wmm_param[6] & 0x0f;
789         if (count == ifmgd->wmm_last_param_set)
790                 return;
791         ifmgd->wmm_last_param_set = count;
792
793         pos = wmm_param + 8;
794         left = wmm_param_len - 8;
795
796         memset(&params, 0, sizeof(params));
797
798         local->wmm_acm = 0;
799         for (; left >= 4; left -= 4, pos += 4) {
800                 int aci = (pos[0] >> 5) & 0x03;
801                 int acm = (pos[0] >> 4) & 0x01;
802                 int queue;
803
804                 switch (aci) {
805                 case 1: /* AC_BK */
806                         queue = 3;
807                         if (acm)
808                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
809                         break;
810                 case 2: /* AC_VI */
811                         queue = 1;
812                         if (acm)
813                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
814                         break;
815                 case 3: /* AC_VO */
816                         queue = 0;
817                         if (acm)
818                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
819                         break;
820                 case 0: /* AC_BE */
821                 default:
822                         queue = 2;
823                         if (acm)
824                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
825                         break;
826                 }
827
828                 params.aifs = pos[0] & 0x0f;
829                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
830                 params.cw_min = ecw2cw(pos[1] & 0x0f);
831                 params.txop = get_unaligned_le16(pos + 2);
832 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
833                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
834                        "cWmin=%d cWmax=%d txop=%d\n",
835                        wiphy_name(local->hw.wiphy), queue, aci, acm,
836                        params.aifs, params.cw_min, params.cw_max, params.txop);
837 #endif
838                 if (drv_conf_tx(local, queue, &params) && local->ops->conf_tx)
839                         printk(KERN_DEBUG "%s: failed to set TX queue "
840                                "parameters for queue %d\n",
841                                wiphy_name(local->hw.wiphy), queue);
842         }
843 }
844
845 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
846                                            u16 capab, bool erp_valid, u8 erp)
847 {
848         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
849         u32 changed = 0;
850         bool use_protection;
851         bool use_short_preamble;
852         bool use_short_slot;
853
854         if (erp_valid) {
855                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
856                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
857         } else {
858                 use_protection = false;
859                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
860         }
861
862         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
863
864         if (use_protection != bss_conf->use_cts_prot) {
865                 bss_conf->use_cts_prot = use_protection;
866                 changed |= BSS_CHANGED_ERP_CTS_PROT;
867         }
868
869         if (use_short_preamble != bss_conf->use_short_preamble) {
870                 bss_conf->use_short_preamble = use_short_preamble;
871                 changed |= BSS_CHANGED_ERP_PREAMBLE;
872         }
873
874         if (use_short_slot != bss_conf->use_short_slot) {
875                 bss_conf->use_short_slot = use_short_slot;
876                 changed |= BSS_CHANGED_ERP_SLOT;
877         }
878
879         return changed;
880 }
881
882 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
883                                      struct ieee80211_mgd_work *wk,
884                                      u32 bss_info_changed)
885 {
886         struct ieee80211_local *local = sdata->local;
887         struct ieee80211_bss *bss = wk->bss;
888
889         bss_info_changed |= BSS_CHANGED_ASSOC;
890         /* set timing information */
891         sdata->vif.bss_conf.beacon_int = bss->cbss.beacon_interval;
892         sdata->vif.bss_conf.timestamp = bss->cbss.tsf;
893         sdata->vif.bss_conf.dtim_period = bss->dtim_period;
894
895         bss_info_changed |= BSS_CHANGED_BEACON_INT;
896         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
897                 bss->cbss.capability, bss->has_erp_value, bss->erp_value);
898
899         sdata->u.mgd.associated = bss;
900         sdata->u.mgd.old_associate_work = wk;
901         memcpy(sdata->u.mgd.bssid, bss->cbss.bssid, ETH_ALEN);
902
903         /* just to be sure */
904         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
905                                 IEEE80211_STA_BEACON_POLL);
906
907         ieee80211_led_assoc(local, 1);
908
909         sdata->vif.bss_conf.assoc = 1;
910         /*
911          * For now just always ask the driver to update the basic rateset
912          * when we have associated, we aren't checking whether it actually
913          * changed or not.
914          */
915         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
916
917         /* And the BSSID changed - we're associated now */
918         bss_info_changed |= BSS_CHANGED_BSSID;
919
920         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
921
922         mutex_lock(&local->iflist_mtx);
923         ieee80211_recalc_ps(local, -1);
924         mutex_unlock(&local->iflist_mtx);
925
926         netif_tx_start_all_queues(sdata->dev);
927         netif_carrier_on(sdata->dev);
928 }
929
930 static enum rx_mgmt_action __must_check
931 ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
932                        struct ieee80211_mgd_work *wk)
933 {
934         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
935         struct ieee80211_local *local = sdata->local;
936
937         wk->tries++;
938         if (wk->tries > IEEE80211_AUTH_MAX_TRIES) {
939                 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
940                        sdata->dev->name, wk->bss->cbss.bssid);
941
942                 /*
943                  * Most likely AP is not in the range so remove the
944                  * bss struct for that AP.
945                  */
946                 cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
947
948                 /*
949                  * We might have a pending scan which had no chance to run yet
950                  * due to work needing to be done. Hence, queue the STAs work
951                  * again for that.
952                  */
953                 ieee80211_queue_work(&local->hw, &ifmgd->work);
954                 return RX_MGMT_CFG80211_AUTH_TO;
955         }
956
957         printk(KERN_DEBUG "%s: direct probe to AP %pM (try %d)\n",
958                         sdata->dev->name, wk->bss->cbss.bssid,
959                         wk->tries);
960
961         /*
962          * Direct probe is sent to broadcast address as some APs
963          * will not answer to direct packet in unassociated state.
964          */
965         ieee80211_send_probe_req(sdata, NULL, wk->ssid, wk->ssid_len, NULL, 0);
966
967         wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
968         run_again(ifmgd, wk->timeout);
969
970         return RX_MGMT_NONE;
971 }
972
973
974 static enum rx_mgmt_action __must_check
975 ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
976                        struct ieee80211_mgd_work *wk)
977 {
978         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
979         struct ieee80211_local *local = sdata->local;
980
981         wk->tries++;
982         if (wk->tries > IEEE80211_AUTH_MAX_TRIES) {
983                 printk(KERN_DEBUG "%s: authentication with AP %pM"
984                        " timed out\n",
985                        sdata->dev->name, wk->bss->cbss.bssid);
986
987                 /*
988                  * Most likely AP is not in the range so remove the
989                  * bss struct for that AP.
990                  */
991                 cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
992
993                 /*
994                  * We might have a pending scan which had no chance to run yet
995                  * due to work needing to be done. Hence, queue the STAs work
996                  * again for that.
997                  */
998                 ieee80211_queue_work(&local->hw, &ifmgd->work);
999                 return RX_MGMT_CFG80211_AUTH_TO;
1000         }
1001
1002         printk(KERN_DEBUG "%s: authenticate with AP %pM (try %d)\n",
1003                sdata->dev->name, wk->bss->cbss.bssid, wk->tries);
1004
1005         ieee80211_send_auth(sdata, 1, wk->auth_alg, wk->ie, wk->ie_len,
1006                             wk->bss->cbss.bssid, NULL, 0, 0);
1007         wk->auth_transaction = 2;
1008
1009         wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
1010         run_again(ifmgd, wk->timeout);
1011
1012         return RX_MGMT_NONE;
1013 }
1014
1015 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1016                                    bool deauth)
1017 {
1018         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1019         struct ieee80211_local *local = sdata->local;
1020         struct sta_info *sta;
1021         u32 changed = 0, config_changed = 0;
1022         u8 bssid[ETH_ALEN];
1023
1024         ASSERT_MGD_MTX(ifmgd);
1025
1026         if (WARN_ON(!ifmgd->associated))
1027                 return;
1028
1029         memcpy(bssid, ifmgd->associated->cbss.bssid, ETH_ALEN);
1030
1031         ifmgd->associated = NULL;
1032         memset(ifmgd->bssid, 0, ETH_ALEN);
1033
1034         if (deauth) {
1035                 kfree(ifmgd->old_associate_work);
1036                 ifmgd->old_associate_work = NULL;
1037         } else {
1038                 struct ieee80211_mgd_work *wk = ifmgd->old_associate_work;
1039
1040                 wk->state = IEEE80211_MGD_STATE_IDLE;
1041                 list_add(&wk->list, &ifmgd->work_list);
1042         }
1043
1044         /*
1045          * we need to commit the associated = NULL change because the
1046          * scan code uses that to determine whether this iface should
1047          * go to/wake up from powersave or not -- and could otherwise
1048          * wake the queues erroneously.
1049          */
1050         smp_mb();
1051
1052         /*
1053          * Thus, we can only afterwards stop the queues -- to account
1054          * for the case where another CPU is finishing a scan at this
1055          * time -- we don't want the scan code to enable queues.
1056          */
1057
1058         netif_tx_stop_all_queues(sdata->dev);
1059         netif_carrier_off(sdata->dev);
1060
1061         rcu_read_lock();
1062         sta = sta_info_get(local, bssid);
1063         if (sta)
1064                 ieee80211_sta_tear_down_BA_sessions(sta);
1065         rcu_read_unlock();
1066
1067         changed |= ieee80211_reset_erp_info(sdata);
1068
1069         ieee80211_led_assoc(local, 0);
1070         changed |= BSS_CHANGED_ASSOC;
1071         sdata->vif.bss_conf.assoc = false;
1072
1073         ieee80211_set_wmm_default(sdata);
1074
1075         ieee80211_recalc_idle(local);
1076
1077         /* channel(_type) changes are handled by ieee80211_hw_config */
1078         local->oper_channel_type = NL80211_CHAN_NO_HT;
1079
1080         /* on the next assoc, re-program HT parameters */
1081         sdata->ht_opmode_valid = false;
1082
1083         local->power_constr_level = 0;
1084
1085         del_timer_sync(&local->dynamic_ps_timer);
1086         cancel_work_sync(&local->dynamic_ps_enable_work);
1087
1088         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1089                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1090                 config_changed |= IEEE80211_CONF_CHANGE_PS;
1091         }
1092
1093         ieee80211_hw_config(local, config_changed);
1094
1095         /* And the BSSID changed -- not very interesting here */
1096         changed |= BSS_CHANGED_BSSID;
1097         ieee80211_bss_info_change_notify(sdata, changed);
1098
1099         rcu_read_lock();
1100
1101         sta = sta_info_get(local, bssid);
1102         if (!sta) {
1103                 rcu_read_unlock();
1104                 return;
1105         }
1106
1107         sta_info_unlink(&sta);
1108
1109         rcu_read_unlock();
1110
1111         sta_info_destroy(sta);
1112 }
1113
1114 static enum rx_mgmt_action __must_check
1115 ieee80211_associate(struct ieee80211_sub_if_data *sdata,
1116                     struct ieee80211_mgd_work *wk)
1117 {
1118         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1119         struct ieee80211_local *local = sdata->local;
1120
1121         wk->tries++;
1122         if (wk->tries > IEEE80211_ASSOC_MAX_TRIES) {
1123                 printk(KERN_DEBUG "%s: association with AP %pM"
1124                        " timed out\n",
1125                        sdata->dev->name, wk->bss->cbss.bssid);
1126
1127                 /*
1128                  * Most likely AP is not in the range so remove the
1129                  * bss struct for that AP.
1130                  */
1131                 cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
1132
1133                 /*
1134                  * We might have a pending scan which had no chance to run yet
1135                  * due to work needing to be done. Hence, queue the STAs work
1136                  * again for that.
1137                  */
1138                 ieee80211_queue_work(&local->hw, &ifmgd->work);
1139                 return RX_MGMT_CFG80211_ASSOC_TO;
1140         }
1141
1142         printk(KERN_DEBUG "%s: associate with AP %pM (try %d)\n",
1143                sdata->dev->name, wk->bss->cbss.bssid, wk->tries);
1144         ieee80211_send_assoc(sdata, wk);
1145
1146         wk->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
1147         run_again(ifmgd, wk->timeout);
1148
1149         return RX_MGMT_NONE;
1150 }
1151
1152 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1153                              struct ieee80211_hdr *hdr)
1154 {
1155         /*
1156          * We can postpone the mgd.timer whenever receiving unicast frames
1157          * from AP because we know that the connection is working both ways
1158          * at that time. But multicast frames (and hence also beacons) must
1159          * be ignored here, because we need to trigger the timer during
1160          * data idle periods for sending the periodic probe request to the
1161          * AP we're connected to.
1162          */
1163         if (is_multicast_ether_addr(hdr->addr1))
1164                 return;
1165
1166         mod_timer(&sdata->u.mgd.conn_mon_timer,
1167                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
1168 }
1169
1170 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1171 {
1172         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1173         const u8 *ssid;
1174
1175         ssid = ieee80211_bss_get_ie(&ifmgd->associated->cbss, WLAN_EID_SSID);
1176         ieee80211_send_probe_req(sdata, ifmgd->associated->cbss.bssid,
1177                                  ssid + 2, ssid[1], NULL, 0);
1178
1179         ifmgd->probe_send_count++;
1180         ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
1181         run_again(ifmgd, ifmgd->probe_timeout);
1182 }
1183
1184 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1185                                    bool beacon)
1186 {
1187         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1188         bool already = false;
1189
1190         if (!netif_running(sdata->dev))
1191                 return;
1192
1193         if (sdata->local->scanning)
1194                 return;
1195
1196         mutex_lock(&ifmgd->mtx);
1197
1198         if (!ifmgd->associated)
1199                 goto out;
1200
1201 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1202         if (beacon && net_ratelimit())
1203                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1204                        "- sending probe request\n", sdata->dev->name);
1205 #endif
1206
1207         /*
1208          * The driver/our work has already reported this event or the
1209          * connection monitoring has kicked in and we have already sent
1210          * a probe request. Or maybe the AP died and the driver keeps
1211          * reporting until we disassociate...
1212          *
1213          * In either case we have to ignore the current call to this
1214          * function (except for setting the correct probe reason bit)
1215          * because otherwise we would reset the timer every time and
1216          * never check whether we received a probe response!
1217          */
1218         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1219                             IEEE80211_STA_CONNECTION_POLL))
1220                 already = true;
1221
1222         if (beacon)
1223                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1224         else
1225                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1226
1227         if (already)
1228                 goto out;
1229
1230         mutex_lock(&sdata->local->iflist_mtx);
1231         ieee80211_recalc_ps(sdata->local, -1);
1232         mutex_unlock(&sdata->local->iflist_mtx);
1233
1234         ifmgd->probe_send_count = 0;
1235         ieee80211_mgd_probe_ap_send(sdata);
1236  out:
1237         mutex_unlock(&ifmgd->mtx);
1238 }
1239
1240 void ieee80211_beacon_loss_work(struct work_struct *work)
1241 {
1242         struct ieee80211_sub_if_data *sdata =
1243                 container_of(work, struct ieee80211_sub_if_data,
1244                              u.mgd.beacon_loss_work);
1245
1246         ieee80211_mgd_probe_ap(sdata, true);
1247 }
1248
1249 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1250 {
1251         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1252
1253         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
1254 }
1255 EXPORT_SYMBOL(ieee80211_beacon_loss);
1256
1257 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1258                                      struct ieee80211_mgd_work *wk)
1259 {
1260         wk->state = IEEE80211_MGD_STATE_IDLE;
1261         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1262 }
1263
1264
1265 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1266                                      struct ieee80211_mgd_work *wk,
1267                                      struct ieee80211_mgmt *mgmt,
1268                                      size_t len)
1269 {
1270         u8 *pos;
1271         struct ieee802_11_elems elems;
1272
1273         pos = mgmt->u.auth.variable;
1274         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1275         if (!elems.challenge)
1276                 return;
1277         ieee80211_send_auth(sdata, 3, wk->auth_alg,
1278                             elems.challenge - 2, elems.challenge_len + 2,
1279                             wk->bss->cbss.bssid,
1280                             wk->key, wk->key_len, wk->key_idx);
1281         wk->auth_transaction = 4;
1282 }
1283
1284 static enum rx_mgmt_action __must_check
1285 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1286                        struct ieee80211_mgd_work *wk,
1287                        struct ieee80211_mgmt *mgmt, size_t len)
1288 {
1289         u16 auth_alg, auth_transaction, status_code;
1290
1291         if (wk->state != IEEE80211_MGD_STATE_AUTH)
1292                 return RX_MGMT_NONE;
1293
1294         if (len < 24 + 6)
1295                 return RX_MGMT_NONE;
1296
1297         if (memcmp(wk->bss->cbss.bssid, mgmt->sa, ETH_ALEN) != 0)
1298                 return RX_MGMT_NONE;
1299
1300         if (memcmp(wk->bss->cbss.bssid, mgmt->bssid, ETH_ALEN) != 0)
1301                 return RX_MGMT_NONE;
1302
1303         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1304         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1305         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1306
1307         if (auth_alg != wk->auth_alg ||
1308             auth_transaction != wk->auth_transaction)
1309                 return RX_MGMT_NONE;
1310
1311         if (status_code != WLAN_STATUS_SUCCESS) {
1312                 list_del(&wk->list);
1313                 kfree(wk);
1314                 return RX_MGMT_CFG80211_AUTH;
1315         }
1316
1317         switch (wk->auth_alg) {
1318         case WLAN_AUTH_OPEN:
1319         case WLAN_AUTH_LEAP:
1320         case WLAN_AUTH_FT:
1321                 ieee80211_auth_completed(sdata, wk);
1322                 return RX_MGMT_CFG80211_AUTH;
1323         case WLAN_AUTH_SHARED_KEY:
1324                 if (wk->auth_transaction == 4) {
1325                         ieee80211_auth_completed(sdata, wk);
1326                         return RX_MGMT_CFG80211_AUTH;
1327                 } else
1328                         ieee80211_auth_challenge(sdata, wk, mgmt, len);
1329                 break;
1330         }
1331
1332         return RX_MGMT_NONE;
1333 }
1334
1335
1336 static enum rx_mgmt_action __must_check
1337 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1338                          struct ieee80211_mgd_work *wk,
1339                          struct ieee80211_mgmt *mgmt, size_t len)
1340 {
1341         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1342         const u8 *bssid = NULL;
1343         u16 reason_code;
1344
1345         if (len < 24 + 2)
1346                 return RX_MGMT_NONE;
1347
1348         ASSERT_MGD_MTX(ifmgd);
1349
1350         if (wk)
1351                 bssid = wk->bss->cbss.bssid;
1352         else
1353                 bssid = ifmgd->associated->cbss.bssid;
1354
1355         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1356
1357         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1358                         sdata->dev->name, bssid, reason_code);
1359
1360         if (!wk) {
1361                 ieee80211_set_disassoc(sdata, true);
1362         } else {
1363                 list_del(&wk->list);
1364                 kfree(wk);
1365         }
1366
1367         return RX_MGMT_CFG80211_DEAUTH;
1368 }
1369
1370
1371 static enum rx_mgmt_action __must_check
1372 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1373                            struct ieee80211_mgmt *mgmt, size_t len)
1374 {
1375         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1376         u16 reason_code;
1377
1378         if (len < 24 + 2)
1379                 return RX_MGMT_NONE;
1380
1381         ASSERT_MGD_MTX(ifmgd);
1382
1383         if (WARN_ON(!ifmgd->associated))
1384                 return RX_MGMT_NONE;
1385
1386         if (WARN_ON(memcmp(ifmgd->associated->cbss.bssid, mgmt->sa, ETH_ALEN)))
1387                 return RX_MGMT_NONE;
1388
1389         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1390
1391         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1392                         sdata->dev->name, mgmt->sa, reason_code);
1393
1394         ieee80211_set_disassoc(sdata, false);
1395         return RX_MGMT_CFG80211_DISASSOC;
1396 }
1397
1398
1399 static enum rx_mgmt_action __must_check
1400 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1401                              struct ieee80211_mgd_work *wk,
1402                              struct ieee80211_mgmt *mgmt, size_t len,
1403                              bool reassoc)
1404 {
1405         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1406         struct ieee80211_local *local = sdata->local;
1407         struct ieee80211_supported_band *sband;
1408         struct sta_info *sta;
1409         u32 rates, basic_rates;
1410         u16 capab_info, status_code, aid;
1411         struct ieee802_11_elems elems;
1412         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1413         u8 *pos;
1414         u32 changed = 0;
1415         int i, j;
1416         bool have_higher_than_11mbit = false, newsta = false;
1417         u16 ap_ht_cap_flags;
1418
1419         /*
1420          * AssocResp and ReassocResp have identical structure, so process both
1421          * of them in this function.
1422          */
1423
1424         if (len < 24 + 6)
1425                 return RX_MGMT_NONE;
1426
1427         if (memcmp(wk->bss->cbss.bssid, mgmt->sa, ETH_ALEN) != 0)
1428                 return RX_MGMT_NONE;
1429
1430         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1431         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1432         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1433
1434         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1435                "status=%d aid=%d)\n",
1436                sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1437                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1438
1439         pos = mgmt->u.assoc_resp.variable;
1440         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1441
1442         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1443             elems.timeout_int && elems.timeout_int_len == 5 &&
1444             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1445                 u32 tu, ms;
1446                 tu = get_unaligned_le32(elems.timeout_int + 1);
1447                 ms = tu * 1024 / 1000;
1448                 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1449                        "comeback duration %u TU (%u ms)\n",
1450                        sdata->dev->name, tu, ms);
1451                 wk->timeout = jiffies + msecs_to_jiffies(ms);
1452                 if (ms > IEEE80211_ASSOC_TIMEOUT)
1453                         run_again(ifmgd, jiffies + msecs_to_jiffies(ms));
1454                 return RX_MGMT_NONE;
1455         }
1456
1457         if (status_code != WLAN_STATUS_SUCCESS) {
1458                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1459                        sdata->dev->name, status_code);
1460                 list_del(&wk->list);
1461                 kfree(wk);
1462                 return RX_MGMT_CFG80211_ASSOC;
1463         }
1464
1465         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1466                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1467                        "set\n", sdata->dev->name, aid);
1468         aid &= ~(BIT(15) | BIT(14));
1469
1470         if (!elems.supp_rates) {
1471                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1472                        sdata->dev->name);
1473                 return RX_MGMT_NONE;
1474         }
1475
1476         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1477         ifmgd->aid = aid;
1478
1479         rcu_read_lock();
1480
1481         /* Add STA entry for the AP */
1482         sta = sta_info_get(local, wk->bss->cbss.bssid);
1483         if (!sta) {
1484                 newsta = true;
1485
1486                 rcu_read_unlock();
1487
1488                 sta = sta_info_alloc(sdata, wk->bss->cbss.bssid, GFP_KERNEL);
1489                 if (!sta) {
1490                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1491                                " the AP\n", sdata->dev->name);
1492                         return RX_MGMT_NONE;
1493                 }
1494
1495                 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1496                                    WLAN_STA_ASSOC_AP);
1497                 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1498                         set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1499
1500                 rcu_read_lock();
1501         }
1502
1503         rates = 0;
1504         basic_rates = 0;
1505         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1506
1507         for (i = 0; i < elems.supp_rates_len; i++) {
1508                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1509                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1510
1511                 if (rate > 110)
1512                         have_higher_than_11mbit = true;
1513
1514                 for (j = 0; j < sband->n_bitrates; j++) {
1515                         if (sband->bitrates[j].bitrate == rate) {
1516                                 rates |= BIT(j);
1517                                 if (is_basic)
1518                                         basic_rates |= BIT(j);
1519                                 break;
1520                         }
1521                 }
1522         }
1523
1524         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1525                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1526                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1527
1528                 if (rate > 110)
1529                         have_higher_than_11mbit = true;
1530
1531                 for (j = 0; j < sband->n_bitrates; j++) {
1532                         if (sband->bitrates[j].bitrate == rate) {
1533                                 rates |= BIT(j);
1534                                 if (is_basic)
1535                                         basic_rates |= BIT(j);
1536                                 break;
1537                         }
1538                 }
1539         }
1540
1541         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1542         sdata->vif.bss_conf.basic_rates = basic_rates;
1543
1544         /* cf. IEEE 802.11 9.2.12 */
1545         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1546             have_higher_than_11mbit)
1547                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1548         else
1549                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1550
1551         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1552                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1553                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1554
1555         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1556
1557         rate_control_rate_init(sta);
1558
1559         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1560                 set_sta_flags(sta, WLAN_STA_MFP);
1561
1562         if (elems.wmm_param)
1563                 set_sta_flags(sta, WLAN_STA_WME);
1564
1565         if (newsta) {
1566                 int err = sta_info_insert(sta);
1567                 if (err) {
1568                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1569                                " the AP (error %d)\n", sdata->dev->name, err);
1570                         rcu_read_unlock();
1571                         return RX_MGMT_NONE;
1572                 }
1573         }
1574
1575         rcu_read_unlock();
1576
1577         if (elems.wmm_param)
1578                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1579                                          elems.wmm_param_len);
1580         else
1581                 ieee80211_set_wmm_default(sdata);
1582
1583         if (elems.ht_info_elem && elems.wmm_param &&
1584             (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
1585             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1586                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1587                                                wk->bss->cbss.bssid,
1588                                                ap_ht_cap_flags);
1589
1590         /* delete work item -- must be before set_associated for PS */
1591         list_del(&wk->list);
1592
1593         /* set AID and assoc capability,
1594          * ieee80211_set_associated() will tell the driver */
1595         bss_conf->aid = aid;
1596         bss_conf->assoc_capability = capab_info;
1597         /* this will take ownership of wk */
1598         ieee80211_set_associated(sdata, wk, changed);
1599
1600         /*
1601          * Start timer to probe the connection to the AP now.
1602          * Also start the timer that will detect beacon loss.
1603          */
1604         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1605         mod_beacon_timer(sdata);
1606
1607         return RX_MGMT_CFG80211_ASSOC;
1608 }
1609
1610
1611 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1612                                   struct ieee80211_mgmt *mgmt,
1613                                   size_t len,
1614                                   struct ieee80211_rx_status *rx_status,
1615                                   struct ieee802_11_elems *elems,
1616                                   bool beacon)
1617 {
1618         struct ieee80211_local *local = sdata->local;
1619         int freq;
1620         struct ieee80211_bss *bss;
1621         struct ieee80211_channel *channel;
1622
1623         if (elems->ds_params && elems->ds_params_len == 1)
1624                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1625         else
1626                 freq = rx_status->freq;
1627
1628         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1629
1630         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1631                 return;
1632
1633         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1634                                         channel, beacon);
1635         if (bss)
1636                 ieee80211_rx_bss_put(local, bss);
1637
1638         if (!sdata->u.mgd.associated)
1639                 return;
1640
1641         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1642             (memcmp(mgmt->bssid, sdata->u.mgd.associated->cbss.bssid,
1643                                                         ETH_ALEN) == 0)) {
1644                 struct ieee80211_channel_sw_ie *sw_elem =
1645                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1646                 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1647         }
1648 }
1649
1650
1651 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1652                                          struct ieee80211_mgd_work *wk,
1653                                          struct ieee80211_mgmt *mgmt, size_t len,
1654                                          struct ieee80211_rx_status *rx_status)
1655 {
1656         struct ieee80211_if_managed *ifmgd;
1657         size_t baselen;
1658         struct ieee802_11_elems elems;
1659
1660         ifmgd = &sdata->u.mgd;
1661
1662         ASSERT_MGD_MTX(ifmgd);
1663
1664         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1665                 return; /* ignore ProbeResp to foreign address */
1666
1667         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1668         if (baselen > len)
1669                 return;
1670
1671         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1672                                 &elems);
1673
1674         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1675
1676         /* direct probe may be part of the association flow */
1677         if (wk && wk->state == IEEE80211_MGD_STATE_PROBE) {
1678                 printk(KERN_DEBUG "%s: direct probe responded\n",
1679                        sdata->dev->name);
1680                 wk->tries = 0;
1681                 wk->state = IEEE80211_MGD_STATE_AUTH;
1682                 WARN_ON(ieee80211_authenticate(sdata, wk) != RX_MGMT_NONE);
1683         }
1684
1685         if (ifmgd->associated &&
1686             memcmp(mgmt->bssid, ifmgd->associated->cbss.bssid, ETH_ALEN) == 0 &&
1687             ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1688                             IEEE80211_STA_CONNECTION_POLL)) {
1689                 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1690                                   IEEE80211_STA_BEACON_POLL);
1691                 mutex_lock(&sdata->local->iflist_mtx);
1692                 ieee80211_recalc_ps(sdata->local, -1);
1693                 mutex_unlock(&sdata->local->iflist_mtx);
1694                 /*
1695                  * We've received a probe response, but are not sure whether
1696                  * we have or will be receiving any beacons or data, so let's
1697                  * schedule the timers again, just in case.
1698                  */
1699                 mod_beacon_timer(sdata);
1700                 mod_timer(&ifmgd->conn_mon_timer,
1701                           round_jiffies_up(jiffies +
1702                                            IEEE80211_CONNECTION_IDLE_TIME));
1703         }
1704 }
1705
1706 /*
1707  * This is the canonical list of information elements we care about,
1708  * the filter code also gives us all changes to the Microsoft OUI
1709  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1710  *
1711  * We implement beacon filtering in software since that means we can
1712  * avoid processing the frame here and in cfg80211, and userspace
1713  * will not be able to tell whether the hardware supports it or not.
1714  *
1715  * XXX: This list needs to be dynamic -- userspace needs to be able to
1716  *      add items it requires. It also needs to be able to tell us to
1717  *      look out for other vendor IEs.
1718  */
1719 static const u64 care_about_ies =
1720         (1ULL << WLAN_EID_COUNTRY) |
1721         (1ULL << WLAN_EID_ERP_INFO) |
1722         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1723         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1724         (1ULL << WLAN_EID_HT_CAPABILITY) |
1725         (1ULL << WLAN_EID_HT_INFORMATION);
1726
1727 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1728                                      struct ieee80211_mgmt *mgmt,
1729                                      size_t len,
1730                                      struct ieee80211_rx_status *rx_status)
1731 {
1732         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1733         size_t baselen;
1734         struct ieee802_11_elems elems;
1735         struct ieee80211_local *local = sdata->local;
1736         u32 changed = 0;
1737         bool erp_valid, directed_tim = false;
1738         u8 erp_value = 0;
1739         u32 ncrc;
1740         u8 *bssid;
1741
1742         ASSERT_MGD_MTX(ifmgd);
1743
1744         /* Process beacon from the current BSS */
1745         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1746         if (baselen > len)
1747                 return;
1748
1749         if (rx_status->freq != local->hw.conf.channel->center_freq)
1750                 return;
1751
1752         /*
1753          * We might have received a number of frames, among them a
1754          * disassoc frame and a beacon...
1755          */
1756         if (!ifmgd->associated)
1757                 return;
1758
1759         bssid = ifmgd->associated->cbss.bssid;
1760
1761         /*
1762          * And in theory even frames from a different AP we were just
1763          * associated to a split-second ago!
1764          */
1765         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1766                 return;
1767
1768         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1769 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1770                 if (net_ratelimit()) {
1771                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1772                                "to a received beacon\n", sdata->dev->name);
1773                 }
1774 #endif
1775                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1776                 mutex_lock(&local->iflist_mtx);
1777                 ieee80211_recalc_ps(local, -1);
1778                 mutex_unlock(&local->iflist_mtx);
1779         }
1780
1781         /*
1782          * Push the beacon loss detection into the future since
1783          * we are processing a beacon from the AP just now.
1784          */
1785         mod_beacon_timer(sdata);
1786
1787         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1788         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1789                                           len - baselen, &elems,
1790                                           care_about_ies, ncrc);
1791
1792         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1793                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1794                                                    ifmgd->aid);
1795
1796         if (ncrc != ifmgd->beacon_crc) {
1797                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1798                                       true);
1799
1800                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1801                                          elems.wmm_param_len);
1802         }
1803
1804         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1805                 if (directed_tim) {
1806                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1807                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1808                                 ieee80211_hw_config(local,
1809                                                     IEEE80211_CONF_CHANGE_PS);
1810                                 ieee80211_send_nullfunc(local, sdata, 0);
1811                         } else {
1812                                 local->pspolling = true;
1813
1814                                 /*
1815                                  * Here is assumed that the driver will be
1816                                  * able to send ps-poll frame and receive a
1817                                  * response even though power save mode is
1818                                  * enabled, but some drivers might require
1819                                  * to disable power save here. This needs
1820                                  * to be investigated.
1821                                  */
1822                                 ieee80211_send_pspoll(local, sdata);
1823                         }
1824                 }
1825         }
1826
1827         if (ncrc == ifmgd->beacon_crc)
1828                 return;
1829         ifmgd->beacon_crc = ncrc;
1830
1831         if (elems.erp_info && elems.erp_info_len >= 1) {
1832                 erp_valid = true;
1833                 erp_value = elems.erp_info[0];
1834         } else {
1835                 erp_valid = false;
1836         }
1837         changed |= ieee80211_handle_bss_capability(sdata,
1838                         le16_to_cpu(mgmt->u.beacon.capab_info),
1839                         erp_valid, erp_value);
1840
1841
1842         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1843             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1844                 struct sta_info *sta;
1845                 struct ieee80211_supported_band *sband;
1846                 u16 ap_ht_cap_flags;
1847
1848                 rcu_read_lock();
1849
1850                 sta = sta_info_get(local, bssid);
1851                 if (WARN_ON(!sta)) {
1852                         rcu_read_unlock();
1853                         return;
1854                 }
1855
1856                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1857
1858                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1859                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1860
1861                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1862
1863                 rcu_read_unlock();
1864
1865                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1866                                                bssid, ap_ht_cap_flags);
1867         }
1868
1869         /* Note: country IE parsing is done for us by cfg80211 */
1870         if (elems.country_elem) {
1871                 /* TODO: IBSS also needs this */
1872                 if (elems.pwr_constr_elem)
1873                         ieee80211_handle_pwr_constr(sdata,
1874                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1875                                 elems.pwr_constr_elem,
1876                                 elems.pwr_constr_elem_len);
1877         }
1878
1879         ieee80211_bss_info_change_notify(sdata, changed);
1880 }
1881
1882 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1883                                           struct sk_buff *skb)
1884 {
1885         struct ieee80211_local *local = sdata->local;
1886         struct ieee80211_mgmt *mgmt;
1887         u16 fc;
1888
1889         if (skb->len < 24)
1890                 return RX_DROP_MONITOR;
1891
1892         mgmt = (struct ieee80211_mgmt *) skb->data;
1893         fc = le16_to_cpu(mgmt->frame_control);
1894
1895         switch (fc & IEEE80211_FCTL_STYPE) {
1896         case IEEE80211_STYPE_PROBE_REQ:
1897         case IEEE80211_STYPE_PROBE_RESP:
1898         case IEEE80211_STYPE_BEACON:
1899         case IEEE80211_STYPE_AUTH:
1900         case IEEE80211_STYPE_ASSOC_RESP:
1901         case IEEE80211_STYPE_REASSOC_RESP:
1902         case IEEE80211_STYPE_DEAUTH:
1903         case IEEE80211_STYPE_DISASSOC:
1904         case IEEE80211_STYPE_ACTION:
1905                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1906                 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
1907                 return RX_QUEUED;
1908         }
1909
1910         return RX_DROP_MONITOR;
1911 }
1912
1913 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1914                                          struct sk_buff *skb)
1915 {
1916         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1917         struct ieee80211_rx_status *rx_status;
1918         struct ieee80211_mgmt *mgmt;
1919         struct ieee80211_mgd_work *wk;
1920         enum rx_mgmt_action rma = RX_MGMT_NONE;
1921         u16 fc;
1922
1923         rx_status = (struct ieee80211_rx_status *) skb->cb;
1924         mgmt = (struct ieee80211_mgmt *) skb->data;
1925         fc = le16_to_cpu(mgmt->frame_control);
1926
1927         mutex_lock(&ifmgd->mtx);
1928
1929         if (ifmgd->associated &&
1930             memcmp(ifmgd->associated->cbss.bssid, mgmt->bssid,
1931                                                         ETH_ALEN) == 0) {
1932                 switch (fc & IEEE80211_FCTL_STYPE) {
1933                 case IEEE80211_STYPE_BEACON:
1934                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1935                                                  rx_status);
1936                         break;
1937                 case IEEE80211_STYPE_PROBE_RESP:
1938                         ieee80211_rx_mgmt_probe_resp(sdata, NULL, mgmt,
1939                                                      skb->len, rx_status);
1940                         break;
1941                 case IEEE80211_STYPE_DEAUTH:
1942                         rma = ieee80211_rx_mgmt_deauth(sdata, NULL,
1943                                                        mgmt, skb->len);
1944                         break;
1945                 case IEEE80211_STYPE_DISASSOC:
1946                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1947                         break;
1948                 case IEEE80211_STYPE_ACTION:
1949                         /* XXX: differentiate, can only happen for CSA now! */
1950                         ieee80211_sta_process_chanswitch(sdata,
1951                                         &mgmt->u.action.u.chan_switch.sw_elem,
1952                                         ifmgd->associated);
1953                         break;
1954                 }
1955                 mutex_unlock(&ifmgd->mtx);
1956
1957                 switch (rma) {
1958                 case RX_MGMT_NONE:
1959                         /* no action */
1960                         break;
1961                 case RX_MGMT_CFG80211_DEAUTH:
1962                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len,
1963                                              NULL);
1964                         break;
1965                 case RX_MGMT_CFG80211_DISASSOC:
1966                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len,
1967                                                NULL);
1968                         break;
1969                 default:
1970                         WARN(1, "unexpected: %d", rma);
1971                 }
1972                 goto out;
1973         }
1974
1975         list_for_each_entry(wk, &ifmgd->work_list, list) {
1976                 if (memcmp(wk->bss->cbss.bssid, mgmt->bssid, ETH_ALEN) != 0)
1977                         continue;
1978
1979                 switch (fc & IEEE80211_FCTL_STYPE) {
1980                 case IEEE80211_STYPE_PROBE_RESP:
1981                         ieee80211_rx_mgmt_probe_resp(sdata, wk, mgmt, skb->len,
1982                                                      rx_status);
1983                         break;
1984                 case IEEE80211_STYPE_AUTH:
1985                         rma = ieee80211_rx_mgmt_auth(sdata, wk, mgmt, skb->len);
1986                         break;
1987                 case IEEE80211_STYPE_ASSOC_RESP:
1988                         rma = ieee80211_rx_mgmt_assoc_resp(sdata, wk, mgmt,
1989                                                            skb->len, false);
1990                         break;
1991                 case IEEE80211_STYPE_REASSOC_RESP:
1992                         rma = ieee80211_rx_mgmt_assoc_resp(sdata, wk, mgmt,
1993                                                            skb->len, true);
1994                         break;
1995                 case IEEE80211_STYPE_DEAUTH:
1996                         rma = ieee80211_rx_mgmt_deauth(sdata, wk, mgmt,
1997                                                        skb->len);
1998                         break;
1999                 }
2000                 /*
2001                  * We've processed this frame for that work, so it can't
2002                  * belong to another work struct.
2003                  * NB: this is also required for correctness because the
2004                  * called functions can free 'wk', and for 'rma'!
2005                  */
2006                 break;
2007         }
2008
2009         mutex_unlock(&ifmgd->mtx);
2010
2011         switch (rma) {
2012         case RX_MGMT_NONE:
2013                 /* no action */
2014                 break;
2015         case RX_MGMT_CFG80211_AUTH:
2016                 cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, skb->len);
2017                 break;
2018         case RX_MGMT_CFG80211_ASSOC:
2019                 cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, skb->len);
2020                 break;
2021         case RX_MGMT_CFG80211_DEAUTH:
2022                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len, NULL);
2023                 break;
2024         default:
2025                 WARN(1, "unexpected: %d", rma);
2026         }
2027
2028  out:
2029         kfree_skb(skb);
2030 }
2031
2032 static void ieee80211_sta_timer(unsigned long data)
2033 {
2034         struct ieee80211_sub_if_data *sdata =
2035                 (struct ieee80211_sub_if_data *) data;
2036         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2037         struct ieee80211_local *local = sdata->local;
2038
2039         if (local->quiescing) {
2040                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2041                 return;
2042         }
2043
2044         ieee80211_queue_work(&local->hw, &ifmgd->work);
2045 }
2046
2047 static void ieee80211_sta_work(struct work_struct *work)
2048 {
2049         struct ieee80211_sub_if_data *sdata =
2050                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
2051         struct ieee80211_local *local = sdata->local;
2052         struct ieee80211_if_managed *ifmgd;
2053         struct sk_buff *skb;
2054         struct ieee80211_mgd_work *wk, *tmp;
2055         LIST_HEAD(free_work);
2056         enum rx_mgmt_action rma;
2057         bool anybusy = false;
2058
2059         if (!netif_running(sdata->dev))
2060                 return;
2061
2062         if (local->scanning)
2063                 return;
2064
2065         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2066                 return;
2067
2068         /*
2069          * ieee80211_queue_work() should have picked up most cases,
2070          * here we'll pick the the rest.
2071          */
2072         if (WARN(local->suspended, "STA MLME work scheduled while "
2073                  "going to suspend\n"))
2074                 return;
2075
2076         ifmgd = &sdata->u.mgd;
2077
2078         /* first process frames to avoid timing out while a frame is pending */
2079         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
2080                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2081
2082         /* then process the rest of the work */
2083         mutex_lock(&ifmgd->mtx);
2084
2085         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2086                             IEEE80211_STA_CONNECTION_POLL) &&
2087             ifmgd->associated) {
2088                 u8 bssid[ETH_ALEN];
2089
2090                 memcpy(bssid, ifmgd->associated->cbss.bssid, ETH_ALEN);
2091                 if (time_is_after_jiffies(ifmgd->probe_timeout))
2092                         run_again(ifmgd, ifmgd->probe_timeout);
2093
2094                 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
2095 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2096                         printk(KERN_DEBUG "No probe response from AP %pM"
2097                                 " after %dms, try %d\n", bssid,
2098                                 (1000 * IEEE80211_PROBE_WAIT)/HZ,
2099                                 ifmgd->probe_send_count);
2100 #endif
2101                         ieee80211_mgd_probe_ap_send(sdata);
2102                 } else {
2103                         /*
2104                          * We actually lost the connection ... or did we?
2105                          * Let's make sure!
2106                          */
2107                         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
2108                                           IEEE80211_STA_BEACON_POLL);
2109                         printk(KERN_DEBUG "No probe response from AP %pM"
2110                                 " after %dms, disconnecting.\n",
2111                                 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
2112                         ieee80211_set_disassoc(sdata, true);
2113                         mutex_unlock(&ifmgd->mtx);
2114                         /*
2115                          * must be outside lock due to cfg80211,
2116                          * but that's not a problem.
2117                          */
2118                         ieee80211_send_deauth_disassoc(sdata, bssid,
2119                                         IEEE80211_STYPE_DEAUTH,
2120                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2121                                         NULL);
2122                         mutex_lock(&ifmgd->mtx);
2123                 }
2124         }
2125
2126
2127         ieee80211_recalc_idle(local);
2128
2129         list_for_each_entry_safe(wk, tmp, &ifmgd->work_list, list) {
2130                 if (time_is_after_jiffies(wk->timeout)) {
2131                         /*
2132                          * This work item isn't supposed to be worked on
2133                          * right now, but take care to adjust the timer
2134                          * properly.
2135                          */
2136                         run_again(ifmgd, wk->timeout);
2137                         continue;
2138                 }
2139
2140                 switch (wk->state) {
2141                 default:
2142                         WARN_ON(1);
2143                         /* fall through */
2144                 case IEEE80211_MGD_STATE_IDLE:
2145                         /* nothing */
2146                         rma = RX_MGMT_NONE;
2147                         break;
2148                 case IEEE80211_MGD_STATE_PROBE:
2149                         rma = ieee80211_direct_probe(sdata, wk);
2150                         break;
2151                 case IEEE80211_MGD_STATE_AUTH:
2152                         rma = ieee80211_authenticate(sdata, wk);
2153                         break;
2154                 case IEEE80211_MGD_STATE_ASSOC:
2155                         rma = ieee80211_associate(sdata, wk);
2156                         break;
2157                 }
2158
2159                 switch (rma) {
2160                 case RX_MGMT_NONE:
2161                         /* no action required */
2162                         break;
2163                 case RX_MGMT_CFG80211_AUTH_TO:
2164                 case RX_MGMT_CFG80211_ASSOC_TO:
2165                         list_del(&wk->list);
2166                         list_add(&wk->list, &free_work);
2167                         wk->tries = rma; /* small abuse but only local */
2168                         break;
2169                 default:
2170                         WARN(1, "unexpected: %d", rma);
2171                 }
2172         }
2173
2174         list_for_each_entry(wk, &ifmgd->work_list, list) {
2175                 if (wk->state != IEEE80211_MGD_STATE_IDLE) {
2176                         anybusy = true;
2177                         break;
2178                 }
2179         }
2180         if (!anybusy &&
2181             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request))
2182                 ieee80211_queue_delayed_work(&local->hw,
2183                                              &local->scan_work,
2184                                              round_jiffies_relative(0));
2185
2186         mutex_unlock(&ifmgd->mtx);
2187
2188         list_for_each_entry_safe(wk, tmp, &free_work, list) {
2189                 switch (wk->tries) {
2190                 case RX_MGMT_CFG80211_AUTH_TO:
2191                         cfg80211_send_auth_timeout(sdata->dev,
2192                                                    wk->bss->cbss.bssid);
2193                         break;
2194                 case RX_MGMT_CFG80211_ASSOC_TO:
2195                         cfg80211_send_assoc_timeout(sdata->dev,
2196                                                     wk->bss->cbss.bssid);
2197                         break;
2198                 default:
2199                         WARN(1, "unexpected: %d", wk->tries);
2200                 }
2201
2202                 list_del(&wk->list);
2203                 kfree(wk);
2204         }
2205
2206         ieee80211_recalc_idle(local);
2207 }
2208
2209 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2210 {
2211         struct ieee80211_sub_if_data *sdata =
2212                 (struct ieee80211_sub_if_data *) data;
2213         struct ieee80211_local *local = sdata->local;
2214
2215         if (local->quiescing)
2216                 return;
2217
2218         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
2219 }
2220
2221 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2222 {
2223         struct ieee80211_sub_if_data *sdata =
2224                 (struct ieee80211_sub_if_data *) data;
2225         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2226         struct ieee80211_local *local = sdata->local;
2227
2228         if (local->quiescing)
2229                 return;
2230
2231         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2232 }
2233
2234 static void ieee80211_sta_monitor_work(struct work_struct *work)
2235 {
2236         struct ieee80211_sub_if_data *sdata =
2237                 container_of(work, struct ieee80211_sub_if_data,
2238                              u.mgd.monitor_work);
2239
2240         ieee80211_mgd_probe_ap(sdata, false);
2241 }
2242
2243 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2244 {
2245         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2246                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
2247                                         IEEE80211_STA_CONNECTION_POLL);
2248
2249                 /* let's probe the connection once */
2250                 ieee80211_queue_work(&sdata->local->hw,
2251                            &sdata->u.mgd.monitor_work);
2252                 /* and do all the other regular work too */
2253                 ieee80211_queue_work(&sdata->local->hw,
2254                            &sdata->u.mgd.work);
2255         }
2256 }
2257
2258 #ifdef CONFIG_PM
2259 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2260 {
2261         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2262
2263         /*
2264          * we need to use atomic bitops for the running bits
2265          * only because both timers might fire at the same
2266          * time -- the code here is properly synchronised.
2267          */
2268
2269         cancel_work_sync(&ifmgd->work);
2270         cancel_work_sync(&ifmgd->beacon_loss_work);
2271         if (del_timer_sync(&ifmgd->timer))
2272                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2273
2274         cancel_work_sync(&ifmgd->chswitch_work);
2275         if (del_timer_sync(&ifmgd->chswitch_timer))
2276                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2277
2278         cancel_work_sync(&ifmgd->monitor_work);
2279         /* these will just be re-established on connection */
2280         del_timer_sync(&ifmgd->conn_mon_timer);
2281         del_timer_sync(&ifmgd->bcn_mon_timer);
2282 }
2283
2284 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2285 {
2286         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2287
2288         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2289                 add_timer(&ifmgd->timer);
2290         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2291                 add_timer(&ifmgd->chswitch_timer);
2292 }
2293 #endif
2294
2295 /* interface setup */
2296 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2297 {
2298         struct ieee80211_if_managed *ifmgd;
2299
2300         ifmgd = &sdata->u.mgd;
2301         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
2302         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2303         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2304         INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
2305         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2306                     (unsigned long) sdata);
2307         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2308                     (unsigned long) sdata);
2309         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2310                     (unsigned long) sdata);
2311         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2312                     (unsigned long) sdata);
2313         skb_queue_head_init(&ifmgd->skb_queue);
2314
2315         INIT_LIST_HEAD(&ifmgd->work_list);
2316
2317         ifmgd->capab = WLAN_CAPABILITY_ESS;
2318         ifmgd->flags = 0;
2319         if (sdata->local->hw.queues >= 4)
2320                 ifmgd->flags |= IEEE80211_STA_WMM_ENABLED;
2321
2322         mutex_init(&ifmgd->mtx);
2323 }
2324
2325 /* scan finished notification */
2326 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2327 {
2328         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2329
2330         /* Restart STA timers */
2331         rcu_read_lock();
2332         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2333                 ieee80211_restart_sta_timer(sdata);
2334         rcu_read_unlock();
2335 }
2336
2337 int ieee80211_max_network_latency(struct notifier_block *nb,
2338                                   unsigned long data, void *dummy)
2339 {
2340         s32 latency_usec = (s32) data;
2341         struct ieee80211_local *local =
2342                 container_of(nb, struct ieee80211_local,
2343                              network_latency_notifier);
2344
2345         mutex_lock(&local->iflist_mtx);
2346         ieee80211_recalc_ps(local, latency_usec);
2347         mutex_unlock(&local->iflist_mtx);
2348
2349         return 0;
2350 }
2351
2352 /* config hooks */
2353 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2354                        struct cfg80211_auth_request *req)
2355 {
2356         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2357         const u8 *ssid;
2358         struct ieee80211_mgd_work *wk;
2359         u16 auth_alg;
2360
2361         switch (req->auth_type) {
2362         case NL80211_AUTHTYPE_OPEN_SYSTEM:
2363                 auth_alg = WLAN_AUTH_OPEN;
2364                 break;
2365         case NL80211_AUTHTYPE_SHARED_KEY:
2366                 auth_alg = WLAN_AUTH_SHARED_KEY;
2367                 break;
2368         case NL80211_AUTHTYPE_FT:
2369                 auth_alg = WLAN_AUTH_FT;
2370                 break;
2371         case NL80211_AUTHTYPE_NETWORK_EAP:
2372                 auth_alg = WLAN_AUTH_LEAP;
2373                 break;
2374         default:
2375                 return -EOPNOTSUPP;
2376         }
2377
2378         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2379         if (!wk)
2380                 return -ENOMEM;
2381
2382         wk->bss = (void *)req->bss;
2383
2384         if (req->ie && req->ie_len) {
2385                 memcpy(wk->ie, req->ie, req->ie_len);
2386                 wk->ie_len = req->ie_len;
2387         }
2388
2389         if (req->key && req->key_len) {
2390                 wk->key_len = req->key_len;
2391                 wk->key_idx = req->key_idx;
2392                 memcpy(wk->key, req->key, req->key_len);
2393         }
2394
2395         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2396         memcpy(wk->ssid, ssid + 2, ssid[1]);
2397         wk->ssid_len = ssid[1];
2398
2399         wk->state = IEEE80211_MGD_STATE_PROBE;
2400         wk->auth_alg = auth_alg;
2401         wk->timeout = jiffies; /* run right away */
2402
2403         /*
2404          * XXX: if still associated need to tell AP that we're going
2405          *      to sleep and then change channel etc.
2406          */
2407         sdata->local->oper_channel = req->bss->channel;
2408         ieee80211_hw_config(sdata->local, 0);
2409
2410         mutex_lock(&ifmgd->mtx);
2411         list_add(&wk->list, &sdata->u.mgd.work_list);
2412         mutex_unlock(&ifmgd->mtx);
2413
2414         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.work);
2415         return 0;
2416 }
2417
2418 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2419                         struct cfg80211_assoc_request *req)
2420 {
2421         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2422         struct ieee80211_mgd_work *wk, *found = NULL;
2423         int i, err;
2424
2425         mutex_lock(&ifmgd->mtx);
2426
2427         list_for_each_entry(wk, &ifmgd->work_list, list) {
2428                 if (&wk->bss->cbss == req->bss &&
2429                     wk->state == IEEE80211_MGD_STATE_IDLE) {
2430                         found = wk;
2431                         break;
2432                 }
2433         }
2434
2435         if (!found) {
2436                 err = -ENOLINK;
2437                 goto out;
2438         }
2439
2440         list_del(&found->list);
2441
2442         wk = krealloc(found, sizeof(*wk) + req->ie_len, GFP_KERNEL);
2443         if (!wk) {
2444                 list_add(&found->list, &ifmgd->work_list);
2445                 err = -ENOMEM;
2446                 goto out;
2447         }
2448
2449         list_add(&wk->list, &ifmgd->work_list);
2450
2451         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2452
2453         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2454                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2455                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2456                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2457                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2458
2459         sdata->local->oper_channel = req->bss->channel;
2460         ieee80211_hw_config(sdata->local, 0);
2461
2462         if (req->ie && req->ie_len) {
2463                 memcpy(wk->ie, req->ie, req->ie_len);
2464                 wk->ie_len = req->ie_len;
2465         } else
2466                 wk->ie_len = 0;
2467
2468         if (req->prev_bssid)
2469                 memcpy(wk->prev_bssid, req->prev_bssid, ETH_ALEN);
2470
2471         wk->state = IEEE80211_MGD_STATE_ASSOC;
2472         wk->tries = 0;
2473         wk->timeout = jiffies; /* run right away */
2474
2475         if (req->use_mfp) {
2476                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2477                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2478         } else {
2479                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2480                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2481         }
2482
2483         if (req->crypto.control_port)
2484                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2485         else
2486                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2487
2488         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.work);
2489
2490         err = 0;
2491
2492  out:
2493         mutex_unlock(&ifmgd->mtx);
2494         return err;
2495 }
2496
2497 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2498                          struct cfg80211_deauth_request *req,
2499                          void *cookie)
2500 {
2501         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2502         struct ieee80211_mgd_work *wk;
2503         const u8 *bssid = NULL;
2504
2505         mutex_lock(&ifmgd->mtx);
2506
2507         if (ifmgd->associated && &ifmgd->associated->cbss == req->bss) {
2508                 bssid = req->bss->bssid;
2509                 ieee80211_set_disassoc(sdata, true);
2510         } else list_for_each_entry(wk, &ifmgd->work_list, list) {
2511                 if (&wk->bss->cbss == req->bss) {
2512                         bssid = req->bss->bssid;
2513                         list_del(&wk->list);
2514                         kfree(wk);
2515                         break;
2516                 }
2517         }
2518
2519         /*
2520          * cfg80211 should catch this ... but it's racy since
2521          * we can receive a deauth frame, process it, hand it
2522          * to cfg80211 while that's in a locked section already
2523          * trying to tell us that the user wants to disconnect.
2524          */
2525         if (!bssid) {
2526                 mutex_unlock(&ifmgd->mtx);
2527                 return -ENOLINK;
2528         }
2529
2530         mutex_unlock(&ifmgd->mtx);
2531
2532         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2533                sdata->dev->name, bssid, req->reason_code);
2534
2535         ieee80211_send_deauth_disassoc(sdata, bssid,
2536                         IEEE80211_STYPE_DEAUTH, req->reason_code,
2537                         cookie);
2538
2539         return 0;
2540 }
2541
2542 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2543                            struct cfg80211_disassoc_request *req,
2544                            void *cookie)
2545 {
2546         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2547
2548         mutex_lock(&ifmgd->mtx);
2549
2550         /*
2551          * cfg80211 should catch this ... but it's racy since
2552          * we can receive a disassoc frame, process it, hand it
2553          * to cfg80211 while that's in a locked section already
2554          * trying to tell us that the user wants to disconnect.
2555          */
2556         if (&ifmgd->associated->cbss != req->bss) {
2557                 mutex_unlock(&ifmgd->mtx);
2558                 return -ENOLINK;
2559         }
2560
2561         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2562                sdata->dev->name, req->bss->bssid, req->reason_code);
2563
2564         ieee80211_set_disassoc(sdata, false);
2565
2566         mutex_unlock(&ifmgd->mtx);
2567
2568         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2569                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2570                         cookie);
2571         return 0;
2572 }