07e7e41816be31cdd210f0dca41219525624c22b
[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_ASSOC_SCANS_MAX_TRIES 2
31 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
32 #define IEEE80211_AUTH_MAX_TRIES 3
33 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
34 #define IEEE80211_ASSOC_MAX_TRIES 3
35 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
36 #define IEEE80211_PROBE_WAIT (HZ / 5)
37 #define IEEE80211_PROBE_IDLE_TIME (60 * HZ)
38 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
39
40 #define TMR_RUNNING_TIMER       0
41 #define TMR_RUNNING_CHANSW      1
42
43 /* utils */
44 static int ecw2cw(int ecw)
45 {
46         return (1 << ecw) - 1;
47 }
48
49 static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie)
50 {
51         u8 *end, *pos;
52
53         pos = bss->cbss.information_elements;
54         if (pos == NULL)
55                 return NULL;
56         end = pos + bss->cbss.len_information_elements;
57
58         while (pos + 1 < end) {
59                 if (pos + 2 + pos[1] > end)
60                         break;
61                 if (pos[0] == ie)
62                         return pos;
63                 pos += 2 + pos[1];
64         }
65
66         return NULL;
67 }
68
69 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
70                                       struct ieee80211_supported_band *sband,
71                                       u32 *rates)
72 {
73         int i, j, count;
74         *rates = 0;
75         count = 0;
76         for (i = 0; i < bss->supp_rates_len; i++) {
77                 int rate = (bss->supp_rates[i] & 0x7F) * 5;
78
79                 for (j = 0; j < sband->n_bitrates; j++)
80                         if (sband->bitrates[j].bitrate == rate) {
81                                 *rates |= BIT(j);
82                                 count++;
83                                 break;
84                         }
85         }
86
87         return count;
88 }
89
90 /*
91  * ieee80211_enable_ht should be called only after the operating band
92  * has been determined as ht configuration depends on the hw's
93  * HT abilities for a specific band.
94  */
95 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
96                                struct ieee80211_ht_info *hti,
97                                u16 ap_ht_cap_flags)
98 {
99         struct ieee80211_local *local = sdata->local;
100         struct ieee80211_supported_band *sband;
101         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
102         struct sta_info *sta;
103         u32 changed = 0;
104         u16 ht_opmode;
105         bool enable_ht = true, ht_changed;
106         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
107
108         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
109
110         /* HT is not supported */
111         if (!sband->ht_cap.ht_supported)
112                 enable_ht = false;
113
114         /* check that channel matches the right operating channel */
115         if (local->hw.conf.channel->center_freq !=
116             ieee80211_channel_to_frequency(hti->control_chan))
117                 enable_ht = false;
118
119         if (enable_ht) {
120                 channel_type = NL80211_CHAN_HT20;
121
122                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
123                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
124                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
125                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
126                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
127                                 if (!(local->hw.conf.channel->flags &
128                                     IEEE80211_CHAN_NO_HT40PLUS))
129                                         channel_type = NL80211_CHAN_HT40PLUS;
130                                 break;
131                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
132                                 if (!(local->hw.conf.channel->flags &
133                                     IEEE80211_CHAN_NO_HT40MINUS))
134                                         channel_type = NL80211_CHAN_HT40MINUS;
135                                 break;
136                         }
137                 }
138         }
139
140         ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
141                      channel_type != local->hw.conf.channel_type;
142
143         local->oper_channel_type = channel_type;
144
145         if (ht_changed) {
146                 /* channel_type change automatically detected */
147                 ieee80211_hw_config(local, 0);
148
149                 rcu_read_lock();
150
151                 sta = sta_info_get(local, ifmgd->bssid);
152                 if (sta)
153                         rate_control_rate_update(local, sband, sta,
154                                                  IEEE80211_RC_HT_CHANGED);
155
156                 rcu_read_unlock();
157         }
158
159         /* disable HT */
160         if (!enable_ht)
161                 return 0;
162
163         ht_opmode = le16_to_cpu(hti->operation_mode);
164
165         /* if bss configuration changed store the new one */
166         if (!sdata->ht_opmode_valid ||
167             sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
168                 changed |= BSS_CHANGED_HT;
169                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
170                 sdata->ht_opmode_valid = true;
171         }
172
173         return changed;
174 }
175
176 /* frame sending functions */
177
178 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
179 {
180         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
181         struct ieee80211_local *local = sdata->local;
182         struct sk_buff *skb;
183         struct ieee80211_mgmt *mgmt;
184         u8 *pos, *ies, *ht_ie;
185         int i, len, count, rates_len, supp_rates_len;
186         u16 capab;
187         struct ieee80211_bss *bss;
188         int wmm = 0;
189         struct ieee80211_supported_band *sband;
190         u32 rates = 0;
191
192         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
193                             sizeof(*mgmt) + 200 + ifmgd->extra_ie_len +
194                             ifmgd->ssid_len);
195         if (!skb) {
196                 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
197                        "frame\n", sdata->dev->name);
198                 return;
199         }
200         skb_reserve(skb, local->hw.extra_tx_headroom);
201
202         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
203
204         capab = ifmgd->capab;
205
206         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
207                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
208                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
209                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
210                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
211         }
212
213         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
214                                    local->hw.conf.channel->center_freq,
215                                    ifmgd->ssid, ifmgd->ssid_len);
216         if (bss) {
217                 if (bss->cbss.capability & WLAN_CAPABILITY_PRIVACY)
218                         capab |= WLAN_CAPABILITY_PRIVACY;
219                 if (bss->wmm_used)
220                         wmm = 1;
221
222                 /* get all rates supported by the device and the AP as
223                  * some APs don't like getting a superset of their rates
224                  * in the association request (e.g. D-Link DAP 1353 in
225                  * b-only mode) */
226                 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
227
228                 if ((bss->cbss.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
229                     (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
230                         capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
231
232                 ieee80211_rx_bss_put(local, bss);
233         } else {
234                 rates = ~0;
235                 rates_len = sband->n_bitrates;
236         }
237
238         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
239         memset(mgmt, 0, 24);
240         memcpy(mgmt->da, ifmgd->bssid, ETH_ALEN);
241         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
242         memcpy(mgmt->bssid, ifmgd->bssid, ETH_ALEN);
243
244         if (ifmgd->flags & IEEE80211_STA_PREV_BSSID_SET) {
245                 skb_put(skb, 10);
246                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
247                                                   IEEE80211_STYPE_REASSOC_REQ);
248                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
249                 mgmt->u.reassoc_req.listen_interval =
250                                 cpu_to_le16(local->hw.conf.listen_interval);
251                 memcpy(mgmt->u.reassoc_req.current_ap, ifmgd->prev_bssid,
252                        ETH_ALEN);
253         } else {
254                 skb_put(skb, 4);
255                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
256                                                   IEEE80211_STYPE_ASSOC_REQ);
257                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
258                 mgmt->u.assoc_req.listen_interval =
259                                 cpu_to_le16(local->hw.conf.listen_interval);
260         }
261
262         /* SSID */
263         ies = pos = skb_put(skb, 2 + ifmgd->ssid_len);
264         *pos++ = WLAN_EID_SSID;
265         *pos++ = ifmgd->ssid_len;
266         memcpy(pos, ifmgd->ssid, ifmgd->ssid_len);
267
268         /* add all rates which were marked to be used above */
269         supp_rates_len = rates_len;
270         if (supp_rates_len > 8)
271                 supp_rates_len = 8;
272
273         len = sband->n_bitrates;
274         pos = skb_put(skb, supp_rates_len + 2);
275         *pos++ = WLAN_EID_SUPP_RATES;
276         *pos++ = supp_rates_len;
277
278         count = 0;
279         for (i = 0; i < sband->n_bitrates; i++) {
280                 if (BIT(i) & rates) {
281                         int rate = sband->bitrates[i].bitrate;
282                         *pos++ = (u8) (rate / 5);
283                         if (++count == 8)
284                                 break;
285                 }
286         }
287
288         if (rates_len > count) {
289                 pos = skb_put(skb, rates_len - count + 2);
290                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
291                 *pos++ = rates_len - count;
292
293                 for (i++; i < sband->n_bitrates; i++) {
294                         if (BIT(i) & rates) {
295                                 int rate = sband->bitrates[i].bitrate;
296                                 *pos++ = (u8) (rate / 5);
297                         }
298                 }
299         }
300
301         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
302                 /* 1. power capabilities */
303                 pos = skb_put(skb, 4);
304                 *pos++ = WLAN_EID_PWR_CAPABILITY;
305                 *pos++ = 2;
306                 *pos++ = 0; /* min tx power */
307                 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
308
309                 /* 2. supported channels */
310                 /* TODO: get this in reg domain format */
311                 pos = skb_put(skb, 2 * sband->n_channels + 2);
312                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
313                 *pos++ = 2 * sband->n_channels;
314                 for (i = 0; i < sband->n_channels; i++) {
315                         *pos++ = ieee80211_frequency_to_channel(
316                                         sband->channels[i].center_freq);
317                         *pos++ = 1; /* one channel in the subband*/
318                 }
319         }
320
321         if (ifmgd->extra_ie) {
322                 pos = skb_put(skb, ifmgd->extra_ie_len);
323                 memcpy(pos, ifmgd->extra_ie, ifmgd->extra_ie_len);
324         }
325
326         if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED)) {
327                 pos = skb_put(skb, 9);
328                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
329                 *pos++ = 7; /* len */
330                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
331                 *pos++ = 0x50;
332                 *pos++ = 0xf2;
333                 *pos++ = 2; /* WME */
334                 *pos++ = 0; /* WME info */
335                 *pos++ = 1; /* WME ver */
336                 *pos++ = 0;
337         }
338
339         /* wmm support is a must to HT */
340         /*
341          * IEEE802.11n does not allow TKIP/WEP as pairwise
342          * ciphers in HT mode. We still associate in non-ht
343          * mode (11a/b/g) if any one of these ciphers is
344          * configured as pairwise.
345          */
346         if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
347             sband->ht_cap.ht_supported &&
348             (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) &&
349             ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
350             (!(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))) {
351                 struct ieee80211_ht_info *ht_info =
352                         (struct ieee80211_ht_info *)(ht_ie + 2);
353                 u16 cap = sband->ht_cap.cap;
354                 __le16 tmp;
355                 u32 flags = local->hw.conf.channel->flags;
356
357                 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
358                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
359                         if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
360                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
361                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
362                         }
363                         break;
364                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
365                         if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
366                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
367                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
368                         }
369                         break;
370                 }
371
372                 tmp = cpu_to_le16(cap);
373                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
374                 *pos++ = WLAN_EID_HT_CAPABILITY;
375                 *pos++ = sizeof(struct ieee80211_ht_cap);
376                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
377                 memcpy(pos, &tmp, sizeof(u16));
378                 pos += sizeof(u16);
379                 /* TODO: needs a define here for << 2 */
380                 *pos++ = sband->ht_cap.ampdu_factor |
381                          (sband->ht_cap.ampdu_density << 2);
382                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
383         }
384
385         kfree(ifmgd->assocreq_ies);
386         ifmgd->assocreq_ies_len = (skb->data + skb->len) - ies;
387         ifmgd->assocreq_ies = kmalloc(ifmgd->assocreq_ies_len, GFP_KERNEL);
388         if (ifmgd->assocreq_ies)
389                 memcpy(ifmgd->assocreq_ies, ies, ifmgd->assocreq_ies_len);
390
391         ieee80211_tx_skb(sdata, skb, 0);
392 }
393
394
395 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
396                                            u16 stype, u16 reason)
397 {
398         struct ieee80211_local *local = sdata->local;
399         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
400         struct sk_buff *skb;
401         struct ieee80211_mgmt *mgmt;
402
403         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
404         if (!skb) {
405                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
406                        "deauth/disassoc frame\n", sdata->dev->name);
407                 return;
408         }
409         skb_reserve(skb, local->hw.extra_tx_headroom);
410
411         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
412         memset(mgmt, 0, 24);
413         memcpy(mgmt->da, ifmgd->bssid, ETH_ALEN);
414         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
415         memcpy(mgmt->bssid, ifmgd->bssid, ETH_ALEN);
416         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
417         skb_put(skb, 2);
418         /* u.deauth.reason_code == u.disassoc.reason_code */
419         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
420
421         if (stype == IEEE80211_STYPE_DEAUTH)
422                 cfg80211_send_deauth(sdata->dev, (u8 *) mgmt, skb->len);
423         else
424                 cfg80211_send_disassoc(sdata->dev, (u8 *) mgmt, skb->len);
425         ieee80211_tx_skb(sdata, skb, ifmgd->flags & IEEE80211_STA_MFP_ENABLED);
426 }
427
428 void ieee80211_send_pspoll(struct ieee80211_local *local,
429                            struct ieee80211_sub_if_data *sdata)
430 {
431         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
432         struct ieee80211_pspoll *pspoll;
433         struct sk_buff *skb;
434         u16 fc;
435
436         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
437         if (!skb) {
438                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
439                        "pspoll frame\n", sdata->dev->name);
440                 return;
441         }
442         skb_reserve(skb, local->hw.extra_tx_headroom);
443
444         pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
445         memset(pspoll, 0, sizeof(*pspoll));
446         fc = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL | IEEE80211_FCTL_PM;
447         pspoll->frame_control = cpu_to_le16(fc);
448         pspoll->aid = cpu_to_le16(ifmgd->aid);
449
450         /* aid in PS-Poll has its two MSBs each set to 1 */
451         pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
452
453         memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
454         memcpy(pspoll->ta, sdata->dev->dev_addr, ETH_ALEN);
455
456         ieee80211_tx_skb(sdata, skb, 0);
457 }
458
459 void ieee80211_send_nullfunc(struct ieee80211_local *local,
460                              struct ieee80211_sub_if_data *sdata,
461                              int powersave)
462 {
463         struct sk_buff *skb;
464         struct ieee80211_hdr *nullfunc;
465         __le16 fc;
466
467         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
468                 return;
469
470         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
471         if (!skb) {
472                 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
473                        "frame\n", sdata->dev->name);
474                 return;
475         }
476         skb_reserve(skb, local->hw.extra_tx_headroom);
477
478         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
479         memset(nullfunc, 0, 24);
480         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
481                          IEEE80211_FCTL_TODS);
482         if (powersave)
483                 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
484         nullfunc->frame_control = fc;
485         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
486         memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
487         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
488
489         ieee80211_tx_skb(sdata, skb, 0);
490 }
491
492 /* spectrum management related things */
493 static void ieee80211_chswitch_work(struct work_struct *work)
494 {
495         struct ieee80211_sub_if_data *sdata =
496                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
497         struct ieee80211_bss *bss;
498         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
499
500         if (!netif_running(sdata->dev))
501                 return;
502
503         bss = ieee80211_rx_bss_get(sdata->local, ifmgd->bssid,
504                                    sdata->local->hw.conf.channel->center_freq,
505                                    ifmgd->ssid, ifmgd->ssid_len);
506         if (!bss)
507                 goto exit;
508
509         sdata->local->oper_channel = sdata->local->csa_channel;
510         /* XXX: shouldn't really modify cfg80211-owned data! */
511         if (!ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL))
512                 bss->cbss.channel = sdata->local->oper_channel;
513
514         ieee80211_rx_bss_put(sdata->local, bss);
515 exit:
516         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
517         ieee80211_wake_queues_by_reason(&sdata->local->hw,
518                                         IEEE80211_QUEUE_STOP_REASON_CSA);
519 }
520
521 static void ieee80211_chswitch_timer(unsigned long data)
522 {
523         struct ieee80211_sub_if_data *sdata =
524                 (struct ieee80211_sub_if_data *) data;
525         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
526
527         if (sdata->local->quiescing) {
528                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
529                 return;
530         }
531
532         queue_work(sdata->local->hw.workqueue, &ifmgd->chswitch_work);
533 }
534
535 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
536                                       struct ieee80211_channel_sw_ie *sw_elem,
537                                       struct ieee80211_bss *bss)
538 {
539         struct ieee80211_channel *new_ch;
540         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
541         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
542
543         if (ifmgd->state != IEEE80211_STA_MLME_ASSOCIATED)
544                 return;
545
546         if (sdata->local->sw_scanning || sdata->local->hw_scanning)
547                 return;
548
549         /* Disregard subsequent beacons if we are already running a timer
550            processing a CSA */
551
552         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
553                 return;
554
555         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
556         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
557                 return;
558
559         sdata->local->csa_channel = new_ch;
560
561         if (sw_elem->count <= 1) {
562                 queue_work(sdata->local->hw.workqueue, &ifmgd->chswitch_work);
563         } else {
564                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
565                                         IEEE80211_QUEUE_STOP_REASON_CSA);
566                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
567                 mod_timer(&ifmgd->chswitch_timer,
568                           jiffies +
569                           msecs_to_jiffies(sw_elem->count *
570                                            bss->cbss.beacon_interval));
571         }
572 }
573
574 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
575                                         u16 capab_info, u8 *pwr_constr_elem,
576                                         u8 pwr_constr_elem_len)
577 {
578         struct ieee80211_conf *conf = &sdata->local->hw.conf;
579
580         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
581                 return;
582
583         /* Power constraint IE length should be 1 octet */
584         if (pwr_constr_elem_len != 1)
585                 return;
586
587         if ((*pwr_constr_elem <= conf->channel->max_power) &&
588             (*pwr_constr_elem != sdata->local->power_constr_level)) {
589                 sdata->local->power_constr_level = *pwr_constr_elem;
590                 ieee80211_hw_config(sdata->local, 0);
591         }
592 }
593
594 /* powersave */
595 static void ieee80211_enable_ps(struct ieee80211_local *local,
596                                 struct ieee80211_sub_if_data *sdata)
597 {
598         struct ieee80211_conf *conf = &local->hw.conf;
599
600         /*
601          * If we are scanning right now then the parameters will
602          * take effect when scan finishes.
603          */
604         if (local->hw_scanning || local->sw_scanning)
605                 return;
606
607         if (conf->dynamic_ps_timeout > 0 &&
608             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
609                 mod_timer(&local->dynamic_ps_timer, jiffies +
610                           msecs_to_jiffies(conf->dynamic_ps_timeout));
611         } else {
612                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
613                         ieee80211_send_nullfunc(local, sdata, 1);
614                 conf->flags |= IEEE80211_CONF_PS;
615                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
616         }
617 }
618
619 static void ieee80211_change_ps(struct ieee80211_local *local)
620 {
621         struct ieee80211_conf *conf = &local->hw.conf;
622
623         if (local->ps_sdata) {
624                 ieee80211_enable_ps(local, local->ps_sdata);
625         } else if (conf->flags & IEEE80211_CONF_PS) {
626                 conf->flags &= ~IEEE80211_CONF_PS;
627                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
628                 del_timer_sync(&local->dynamic_ps_timer);
629                 cancel_work_sync(&local->dynamic_ps_enable_work);
630         }
631 }
632
633 /* need to hold RTNL or interface lock */
634 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
635 {
636         struct ieee80211_sub_if_data *sdata, *found = NULL;
637         int count = 0;
638
639         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
640                 local->ps_sdata = NULL;
641                 return;
642         }
643
644         list_for_each_entry(sdata, &local->interfaces, list) {
645                 if (!netif_running(sdata->dev))
646                         continue;
647                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
648                         continue;
649                 found = sdata;
650                 count++;
651         }
652
653         if (count == 1 && found->u.mgd.powersave &&
654             (found->u.mgd.flags & IEEE80211_STA_ASSOCIATED) &&
655             !(found->u.mgd.flags & IEEE80211_STA_PROBEREQ_POLL)) {
656                 s32 beaconint_us;
657
658                 if (latency < 0)
659                         latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
660
661                 beaconint_us = ieee80211_tu_to_usec(
662                                         found->vif.bss_conf.beacon_int);
663
664                 if (beaconint_us > latency) {
665                         local->ps_sdata = NULL;
666                 } else {
667                         u8 dtimper = found->vif.bss_conf.dtim_period;
668                         int maxslp = 1;
669
670                         if (dtimper > 1)
671                                 maxslp = min_t(int, dtimper,
672                                                     latency / beaconint_us);
673
674                         local->hw.conf.max_sleep_period = maxslp;
675                         local->ps_sdata = found;
676                 }
677         } else {
678                 local->ps_sdata = NULL;
679         }
680
681         ieee80211_change_ps(local);
682 }
683
684 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
685 {
686         struct ieee80211_local *local =
687                 container_of(work, struct ieee80211_local,
688                              dynamic_ps_disable_work);
689
690         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
691                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
692                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
693         }
694
695         ieee80211_wake_queues_by_reason(&local->hw,
696                                         IEEE80211_QUEUE_STOP_REASON_PS);
697 }
698
699 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
700 {
701         struct ieee80211_local *local =
702                 container_of(work, struct ieee80211_local,
703                              dynamic_ps_enable_work);
704         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
705
706         /* can only happen when PS was just disabled anyway */
707         if (!sdata)
708                 return;
709
710         if (local->hw.conf.flags & IEEE80211_CONF_PS)
711                 return;
712
713         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
714                 ieee80211_send_nullfunc(local, sdata, 1);
715
716         local->hw.conf.flags |= IEEE80211_CONF_PS;
717         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
718 }
719
720 void ieee80211_dynamic_ps_timer(unsigned long data)
721 {
722         struct ieee80211_local *local = (void *) data;
723
724         if (local->quiescing || local->suspended)
725                 return;
726
727         queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
728 }
729
730 /* MLME */
731 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
732                                      struct ieee80211_if_managed *ifmgd,
733                                      u8 *wmm_param, size_t wmm_param_len)
734 {
735         struct ieee80211_tx_queue_params params;
736         size_t left;
737         int count;
738         u8 *pos;
739
740         if (!(ifmgd->flags & IEEE80211_STA_WMM_ENABLED))
741                 return;
742
743         if (!wmm_param)
744                 return;
745
746         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
747                 return;
748         count = wmm_param[6] & 0x0f;
749         if (count == ifmgd->wmm_last_param_set)
750                 return;
751         ifmgd->wmm_last_param_set = count;
752
753         pos = wmm_param + 8;
754         left = wmm_param_len - 8;
755
756         memset(&params, 0, sizeof(params));
757
758         local->wmm_acm = 0;
759         for (; left >= 4; left -= 4, pos += 4) {
760                 int aci = (pos[0] >> 5) & 0x03;
761                 int acm = (pos[0] >> 4) & 0x01;
762                 int queue;
763
764                 switch (aci) {
765                 case 1: /* AC_BK */
766                         queue = 3;
767                         if (acm)
768                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
769                         break;
770                 case 2: /* AC_VI */
771                         queue = 1;
772                         if (acm)
773                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
774                         break;
775                 case 3: /* AC_VO */
776                         queue = 0;
777                         if (acm)
778                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
779                         break;
780                 case 0: /* AC_BE */
781                 default:
782                         queue = 2;
783                         if (acm)
784                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
785                         break;
786                 }
787
788                 params.aifs = pos[0] & 0x0f;
789                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
790                 params.cw_min = ecw2cw(pos[1] & 0x0f);
791                 params.txop = get_unaligned_le16(pos + 2);
792 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
793                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
794                        "cWmin=%d cWmax=%d txop=%d\n",
795                        wiphy_name(local->hw.wiphy), queue, aci, acm,
796                        params.aifs, params.cw_min, params.cw_max, params.txop);
797 #endif
798                 if (drv_conf_tx(local, queue, &params) && local->ops->conf_tx)
799                         printk(KERN_DEBUG "%s: failed to set TX queue "
800                                "parameters for queue %d\n",
801                                wiphy_name(local->hw.wiphy), queue);
802         }
803 }
804
805 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
806                                            u16 capab, bool erp_valid, u8 erp)
807 {
808         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
809 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
810         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
811 #endif
812         u32 changed = 0;
813         bool use_protection;
814         bool use_short_preamble;
815         bool use_short_slot;
816
817         if (erp_valid) {
818                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
819                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
820         } else {
821                 use_protection = false;
822                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
823         }
824
825         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
826
827         if (use_protection != bss_conf->use_cts_prot) {
828 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
829                 if (net_ratelimit()) {
830                         printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
831                                sdata->dev->name,
832                                use_protection ? "enabled" : "disabled",
833                                ifmgd->bssid);
834                 }
835 #endif
836                 bss_conf->use_cts_prot = use_protection;
837                 changed |= BSS_CHANGED_ERP_CTS_PROT;
838         }
839
840         if (use_short_preamble != bss_conf->use_short_preamble) {
841 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
842                 if (net_ratelimit()) {
843                         printk(KERN_DEBUG "%s: switched to %s barker preamble"
844                                " (BSSID=%pM)\n",
845                                sdata->dev->name,
846                                use_short_preamble ? "short" : "long",
847                                ifmgd->bssid);
848                 }
849 #endif
850                 bss_conf->use_short_preamble = use_short_preamble;
851                 changed |= BSS_CHANGED_ERP_PREAMBLE;
852         }
853
854         if (use_short_slot != bss_conf->use_short_slot) {
855 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
856                 if (net_ratelimit()) {
857                         printk(KERN_DEBUG "%s: switched to %s slot time"
858                                " (BSSID=%pM)\n",
859                                sdata->dev->name,
860                                use_short_slot ? "short" : "long",
861                                ifmgd->bssid);
862                 }
863 #endif
864                 bss_conf->use_short_slot = use_short_slot;
865                 changed |= BSS_CHANGED_ERP_SLOT;
866         }
867
868         return changed;
869 }
870
871 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata)
872 {
873         union iwreq_data wrqu;
874
875         memset(&wrqu, 0, sizeof(wrqu));
876         if (sdata->u.mgd.flags & IEEE80211_STA_ASSOCIATED)
877                 memcpy(wrqu.ap_addr.sa_data, sdata->u.mgd.bssid, ETH_ALEN);
878         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
879         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
880 }
881
882 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata)
883 {
884         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
885         char *buf;
886         size_t len;
887         int i;
888         union iwreq_data wrqu;
889
890         if (!ifmgd->assocreq_ies && !ifmgd->assocresp_ies)
891                 return;
892
893         buf = kmalloc(50 + 2 * (ifmgd->assocreq_ies_len +
894                                 ifmgd->assocresp_ies_len), GFP_KERNEL);
895         if (!buf)
896                 return;
897
898         len = sprintf(buf, "ASSOCINFO(");
899         if (ifmgd->assocreq_ies) {
900                 len += sprintf(buf + len, "ReqIEs=");
901                 for (i = 0; i < ifmgd->assocreq_ies_len; i++) {
902                         len += sprintf(buf + len, "%02x",
903                                        ifmgd->assocreq_ies[i]);
904                 }
905         }
906         if (ifmgd->assocresp_ies) {
907                 if (ifmgd->assocreq_ies)
908                         len += sprintf(buf + len, " ");
909                 len += sprintf(buf + len, "RespIEs=");
910                 for (i = 0; i < ifmgd->assocresp_ies_len; i++) {
911                         len += sprintf(buf + len, "%02x",
912                                        ifmgd->assocresp_ies[i]);
913                 }
914         }
915         len += sprintf(buf + len, ")");
916
917         if (len > IW_CUSTOM_MAX) {
918                 len = sprintf(buf, "ASSOCRESPIE=");
919                 for (i = 0; i < ifmgd->assocresp_ies_len; i++) {
920                         len += sprintf(buf + len, "%02x",
921                                        ifmgd->assocresp_ies[i]);
922                 }
923         }
924
925         if (len <= IW_CUSTOM_MAX) {
926                 memset(&wrqu, 0, sizeof(wrqu));
927                 wrqu.data.length = len;
928                 wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
929         }
930
931         kfree(buf);
932 }
933
934
935 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
936                                      u32 bss_info_changed)
937 {
938         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
939         struct ieee80211_local *local = sdata->local;
940         struct ieee80211_conf *conf = &local_to_hw(local)->conf;
941
942         struct ieee80211_bss *bss;
943
944         bss_info_changed |= BSS_CHANGED_ASSOC;
945         ifmgd->flags |= IEEE80211_STA_ASSOCIATED;
946
947         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
948                                    conf->channel->center_freq,
949                                    ifmgd->ssid, ifmgd->ssid_len);
950         if (bss) {
951                 /* set timing information */
952                 sdata->vif.bss_conf.beacon_int = bss->cbss.beacon_interval;
953                 sdata->vif.bss_conf.timestamp = bss->cbss.tsf;
954                 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
955
956                 bss_info_changed |= BSS_CHANGED_BEACON_INT;
957                 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
958                         bss->cbss.capability, bss->has_erp_value, bss->erp_value);
959
960                 cfg80211_hold_bss(&bss->cbss);
961
962                 ieee80211_rx_bss_put(local, bss);
963         }
964
965         ifmgd->flags |= IEEE80211_STA_PREV_BSSID_SET;
966         memcpy(ifmgd->prev_bssid, sdata->u.mgd.bssid, ETH_ALEN);
967         ieee80211_sta_send_associnfo(sdata);
968
969         ifmgd->last_probe = jiffies;
970         ieee80211_led_assoc(local, 1);
971
972         sdata->vif.bss_conf.assoc = 1;
973         /*
974          * For now just always ask the driver to update the basic rateset
975          * when we have associated, we aren't checking whether it actually
976          * changed or not.
977          */
978         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
979
980         /* And the BSSID changed - we're associated now */
981         bss_info_changed |= BSS_CHANGED_BSSID;
982
983         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
984
985         /* will be same as sdata */
986         if (local->ps_sdata) {
987                 mutex_lock(&local->iflist_mtx);
988                 ieee80211_recalc_ps(local, -1);
989                 mutex_unlock(&local->iflist_mtx);
990         }
991
992         netif_tx_start_all_queues(sdata->dev);
993         netif_carrier_on(sdata->dev);
994
995         ieee80211_sta_send_apinfo(sdata);
996 }
997
998 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata)
999 {
1000         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1001         struct ieee80211_local *local = sdata->local;
1002
1003         ifmgd->direct_probe_tries++;
1004         if (ifmgd->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
1005                 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
1006                        sdata->dev->name, ifmgd->bssid);
1007                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1008                 ieee80211_recalc_idle(local);
1009                 cfg80211_send_auth_timeout(sdata->dev, ifmgd->bssid);
1010
1011                 /*
1012                  * Most likely AP is not in the range so remove the
1013                  * bss information associated to the AP
1014                  */
1015                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
1016                                 sdata->local->hw.conf.channel->center_freq,
1017                                 ifmgd->ssid, ifmgd->ssid_len);
1018
1019                 /*
1020                  * We might have a pending scan which had no chance to run yet
1021                  * due to state == IEEE80211_STA_MLME_DIRECT_PROBE.
1022                  * Hence, queue the STAs work again
1023                  */
1024                 queue_work(local->hw.workqueue, &ifmgd->work);
1025                 return;
1026         }
1027
1028         printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
1029                         sdata->dev->name, ifmgd->bssid,
1030                         ifmgd->direct_probe_tries);
1031
1032         ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1033
1034         /* Direct probe is sent to broadcast address as some APs
1035          * will not answer to direct packet in unassociated state.
1036          */
1037         ieee80211_send_probe_req(sdata, NULL,
1038                                  ifmgd->ssid, ifmgd->ssid_len, NULL, 0);
1039
1040         mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
1041 }
1042
1043
1044 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata)
1045 {
1046         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1047         struct ieee80211_local *local = sdata->local;
1048         u8 *ies;
1049         size_t ies_len;
1050
1051         ifmgd->auth_tries++;
1052         if (ifmgd->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
1053                 printk(KERN_DEBUG "%s: authentication with AP %pM"
1054                        " timed out\n",
1055                        sdata->dev->name, ifmgd->bssid);
1056                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1057                 ieee80211_recalc_idle(local);
1058                 cfg80211_send_auth_timeout(sdata->dev, ifmgd->bssid);
1059                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
1060                                 sdata->local->hw.conf.channel->center_freq,
1061                                 ifmgd->ssid, ifmgd->ssid_len);
1062
1063                 /*
1064                  * We might have a pending scan which had no chance to run yet
1065                  * due to state == IEEE80211_STA_MLME_AUTHENTICATE.
1066                  * Hence, queue the STAs work again
1067                  */
1068                 queue_work(local->hw.workqueue, &ifmgd->work);
1069                 return;
1070         }
1071
1072         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
1073         printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
1074                sdata->dev->name, ifmgd->bssid);
1075
1076         if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
1077                 ies = ifmgd->sme_auth_ie;
1078                 ies_len = ifmgd->sme_auth_ie_len;
1079         } else {
1080                 ies = NULL;
1081                 ies_len = 0;
1082         }
1083         ieee80211_send_auth(sdata, 1, ifmgd->auth_alg, ies, ies_len,
1084                             ifmgd->bssid, 0);
1085         ifmgd->auth_transaction = 2;
1086
1087         mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
1088 }
1089
1090 /*
1091  * The disassoc 'reason' argument can be either our own reason
1092  * if self disconnected or a reason code from the AP.
1093  */
1094 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1095                                    bool deauth, bool self_disconnected,
1096                                    u16 reason)
1097 {
1098         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1099         struct ieee80211_local *local = sdata->local;
1100         struct ieee80211_conf *conf = &local_to_hw(local)->conf;
1101         struct ieee80211_bss *bss;
1102         struct sta_info *sta;
1103         u32 changed = 0, config_changed = 0;
1104
1105         if (deauth) {
1106                 ifmgd->direct_probe_tries = 0;
1107                 ifmgd->auth_tries = 0;
1108         }
1109         ifmgd->assoc_scan_tries = 0;
1110         ifmgd->assoc_tries = 0;
1111
1112         netif_tx_stop_all_queues(sdata->dev);
1113         netif_carrier_off(sdata->dev);
1114
1115         rcu_read_lock();
1116         sta = sta_info_get(local, ifmgd->bssid);
1117         if (sta)
1118                 ieee80211_sta_tear_down_BA_sessions(sta);
1119         rcu_read_unlock();
1120
1121         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
1122                                    conf->channel->center_freq,
1123                                    ifmgd->ssid, ifmgd->ssid_len);
1124
1125         if (bss) {
1126                 cfg80211_unhold_bss(&bss->cbss);
1127                 ieee80211_rx_bss_put(local, bss);
1128         }
1129
1130         if (self_disconnected) {
1131                 if (deauth)
1132                         ieee80211_send_deauth_disassoc(sdata,
1133                                 IEEE80211_STYPE_DEAUTH, reason);
1134                 else
1135                         ieee80211_send_deauth_disassoc(sdata,
1136                                 IEEE80211_STYPE_DISASSOC, reason);
1137         }
1138
1139         ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
1140         changed |= ieee80211_reset_erp_info(sdata);
1141
1142         ieee80211_led_assoc(local, 0);
1143         changed |= BSS_CHANGED_ASSOC;
1144         sdata->vif.bss_conf.assoc = false;
1145
1146         ieee80211_sta_send_apinfo(sdata);
1147
1148         if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT) {
1149                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1150                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
1151                                 sdata->local->hw.conf.channel->center_freq,
1152                                 ifmgd->ssid, ifmgd->ssid_len);
1153         }
1154
1155         ieee80211_set_wmm_default(sdata);
1156
1157         ieee80211_recalc_idle(local);
1158
1159         /* channel(_type) changes are handled by ieee80211_hw_config */
1160         local->oper_channel_type = NL80211_CHAN_NO_HT;
1161
1162         /* on the next assoc, re-program HT parameters */
1163         sdata->ht_opmode_valid = false;
1164
1165         local->power_constr_level = 0;
1166
1167         del_timer_sync(&local->dynamic_ps_timer);
1168         cancel_work_sync(&local->dynamic_ps_enable_work);
1169
1170         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1171                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1172                 config_changed |= IEEE80211_CONF_CHANGE_PS;
1173         }
1174
1175         ieee80211_hw_config(local, config_changed);
1176
1177         /* And the BSSID changed -- not very interesting here */
1178         changed |= BSS_CHANGED_BSSID;
1179         ieee80211_bss_info_change_notify(sdata, changed);
1180
1181         rcu_read_lock();
1182
1183         sta = sta_info_get(local, ifmgd->bssid);
1184         if (!sta) {
1185                 rcu_read_unlock();
1186                 return;
1187         }
1188
1189         sta_info_unlink(&sta);
1190
1191         rcu_read_unlock();
1192
1193         sta_info_destroy(sta);
1194 }
1195
1196 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
1197 {
1198         if (!sdata || !sdata->default_key ||
1199             sdata->default_key->conf.alg != ALG_WEP)
1200                 return 0;
1201         return 1;
1202 }
1203
1204 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata)
1205 {
1206         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1207         struct ieee80211_local *local = sdata->local;
1208         struct ieee80211_bss *bss;
1209         int bss_privacy;
1210         int wep_privacy;
1211         int privacy_invoked;
1212
1213         if (!ifmgd || (ifmgd->flags & IEEE80211_STA_EXT_SME))
1214                 return 0;
1215
1216         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
1217                                    local->hw.conf.channel->center_freq,
1218                                    ifmgd->ssid, ifmgd->ssid_len);
1219         if (!bss)
1220                 return 0;
1221
1222         bss_privacy = !!(bss->cbss.capability & WLAN_CAPABILITY_PRIVACY);
1223         wep_privacy = !!ieee80211_sta_wep_configured(sdata);
1224         privacy_invoked = !!(ifmgd->flags & IEEE80211_STA_PRIVACY_INVOKED);
1225
1226         ieee80211_rx_bss_put(local, bss);
1227
1228         if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
1229                 return 0;
1230
1231         return 1;
1232 }
1233
1234 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata)
1235 {
1236         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1237         struct ieee80211_local *local = sdata->local;
1238
1239         ifmgd->assoc_tries++;
1240         if (ifmgd->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
1241                 printk(KERN_DEBUG "%s: association with AP %pM"
1242                        " timed out\n",
1243                        sdata->dev->name, ifmgd->bssid);
1244                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1245                 ieee80211_recalc_idle(local);
1246                 cfg80211_send_assoc_timeout(sdata->dev, ifmgd->bssid);
1247                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
1248                                 sdata->local->hw.conf.channel->center_freq,
1249                                 ifmgd->ssid, ifmgd->ssid_len);
1250                 /*
1251                  * We might have a pending scan which had no chance to run yet
1252                  * due to state == IEEE80211_STA_MLME_ASSOCIATE.
1253                  * Hence, queue the STAs work again
1254                  */
1255                 queue_work(local->hw.workqueue, &ifmgd->work);
1256                 return;
1257         }
1258
1259         ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE;
1260         printk(KERN_DEBUG "%s: associate with AP %pM\n",
1261                sdata->dev->name, ifmgd->bssid);
1262         if (ieee80211_privacy_mismatch(sdata)) {
1263                 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
1264                        "mixed-cell disabled - abort association\n", sdata->dev->name);
1265                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1266                 ieee80211_recalc_idle(local);
1267                 return;
1268         }
1269
1270         ieee80211_send_assoc(sdata);
1271
1272         mod_timer(&ifmgd->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
1273 }
1274
1275 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1276                              struct ieee80211_hdr *hdr)
1277 {
1278         /*
1279          * We can postpone the mgd.timer whenever receiving unicast frames
1280          * from AP because we know that the connection is working both ways
1281          * at that time. But multicast frames (and hence also beacons) must
1282          * be ignored here, because we need to trigger the timer during
1283          * data idle periods for sending the periodical probe request to
1284          * the AP.
1285          */
1286         if (!is_multicast_ether_addr(hdr->addr1))
1287                 mod_timer(&sdata->u.mgd.timer,
1288                           jiffies + IEEE80211_MONITORING_INTERVAL);
1289 }
1290
1291 void ieee80211_beacon_loss_work(struct work_struct *work)
1292 {
1293         struct ieee80211_sub_if_data *sdata =
1294                 container_of(work, struct ieee80211_sub_if_data,
1295                              u.mgd.beacon_loss_work);
1296         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1297
1298         /*
1299          * The driver has already reported this event and we have
1300          * already sent a probe request. Maybe the AP died and the
1301          * driver keeps reporting until we disassociate... We have
1302          * to ignore that because otherwise we would continually
1303          * reset the timer and never check whether we received a
1304          * probe response!
1305          */
1306         if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL)
1307                 return;
1308
1309 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1310         if (net_ratelimit()) {
1311                 printk(KERN_DEBUG "%s: driver reports beacon loss from AP %pM "
1312                        "- sending probe request\n", sdata->dev->name,
1313                        sdata->u.mgd.bssid);
1314         }
1315 #endif
1316
1317         ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1318
1319         mutex_lock(&sdata->local->iflist_mtx);
1320         ieee80211_recalc_ps(sdata->local, -1);
1321         mutex_unlock(&sdata->local->iflist_mtx);
1322
1323         ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1324                                  ifmgd->ssid_len, NULL, 0);
1325
1326         mod_timer(&ifmgd->timer, jiffies + IEEE80211_PROBE_WAIT);
1327 }
1328
1329 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1330 {
1331         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1332
1333         queue_work(sdata->local->hw.workqueue,
1334                    &sdata->u.mgd.beacon_loss_work);
1335 }
1336 EXPORT_SYMBOL(ieee80211_beacon_loss);
1337
1338 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata)
1339 {
1340         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1341         struct ieee80211_local *local = sdata->local;
1342         struct sta_info *sta;
1343         unsigned long last_rx;
1344         bool disassoc = false;
1345
1346         /* TODO: start monitoring current AP signal quality and number of
1347          * missed beacons. Scan other channels every now and then and search
1348          * for better APs. */
1349         /* TODO: remove expired BSSes */
1350
1351         ifmgd->state = IEEE80211_STA_MLME_ASSOCIATED;
1352
1353         rcu_read_lock();
1354
1355         sta = sta_info_get(local, ifmgd->bssid);
1356         if (!sta) {
1357                 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
1358                        sdata->dev->name, ifmgd->bssid);
1359                 disassoc = true;
1360                 rcu_read_unlock();
1361                 goto out;
1362         }
1363
1364         last_rx = sta->last_rx;
1365         rcu_read_unlock();
1366
1367         if ((ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) &&
1368             time_after(jiffies, last_rx + IEEE80211_PROBE_WAIT)) {
1369                 printk(KERN_DEBUG "%s: no probe response from AP %pM "
1370                        "- disassociating\n",
1371                        sdata->dev->name, ifmgd->bssid);
1372                 disassoc = true;
1373                 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1374                 goto out;
1375         }
1376
1377         /*
1378          * Beacon filtering is only enabled with power save and then the
1379          * stack should not check for beacon loss.
1380          */
1381         if (!((local->hw.flags & IEEE80211_HW_BEACON_FILTER) &&
1382               (local->hw.conf.flags & IEEE80211_CONF_PS)) &&
1383             time_after(jiffies,
1384                        ifmgd->last_beacon + IEEE80211_MONITORING_INTERVAL)) {
1385 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1386                 if (net_ratelimit()) {
1387                         printk(KERN_DEBUG "%s: beacon loss from AP %pM "
1388                                "- sending probe request\n",
1389                                sdata->dev->name, ifmgd->bssid);
1390                 }
1391 #endif
1392                 ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1393                 mutex_lock(&local->iflist_mtx);
1394                 ieee80211_recalc_ps(local, -1);
1395                 mutex_unlock(&local->iflist_mtx);
1396                 ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1397                                          ifmgd->ssid_len, NULL, 0);
1398                 mod_timer(&ifmgd->timer, jiffies + IEEE80211_PROBE_WAIT);
1399                 goto out;
1400         }
1401
1402         if (time_after(jiffies, last_rx + IEEE80211_PROBE_IDLE_TIME)) {
1403                 ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1404                 mutex_lock(&local->iflist_mtx);
1405                 ieee80211_recalc_ps(local, -1);
1406                 mutex_unlock(&local->iflist_mtx);
1407                 ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1408                                          ifmgd->ssid_len, NULL, 0);
1409         }
1410
1411  out:
1412         if (!disassoc)
1413                 mod_timer(&ifmgd->timer,
1414                           jiffies + IEEE80211_MONITORING_INTERVAL);
1415         else
1416                 ieee80211_set_disassoc(sdata, true, true,
1417                                         WLAN_REASON_PREV_AUTH_NOT_VALID);
1418 }
1419
1420
1421 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata)
1422 {
1423         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1424
1425         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1426         ifmgd->flags |= IEEE80211_STA_AUTHENTICATED;
1427         if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
1428                 /* Wait for SME to request association */
1429                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1430                 ieee80211_recalc_idle(sdata->local);
1431         } else
1432                 ieee80211_associate(sdata);
1433 }
1434
1435
1436 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1437                                      struct ieee80211_mgmt *mgmt,
1438                                      size_t len)
1439 {
1440         u8 *pos;
1441         struct ieee802_11_elems elems;
1442
1443         pos = mgmt->u.auth.variable;
1444         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1445         if (!elems.challenge)
1446                 return;
1447         ieee80211_send_auth(sdata, 3, sdata->u.mgd.auth_alg,
1448                             elems.challenge - 2, elems.challenge_len + 2,
1449                             sdata->u.mgd.bssid, 1);
1450         sdata->u.mgd.auth_transaction = 4;
1451 }
1452
1453 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1454                                    struct ieee80211_mgmt *mgmt,
1455                                    size_t len)
1456 {
1457         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1458         u16 auth_alg, auth_transaction, status_code;
1459
1460         if (ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE)
1461                 return;
1462
1463         if (len < 24 + 6)
1464                 return;
1465
1466         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
1467                 return;
1468
1469         if (memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
1470                 return;
1471
1472         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1473         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1474         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1475
1476         if (auth_alg != ifmgd->auth_alg ||
1477             auth_transaction != ifmgd->auth_transaction)
1478                 return;
1479
1480         if (status_code != WLAN_STATUS_SUCCESS) {
1481                 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1482                         u8 algs[3];
1483                         const int num_algs = ARRAY_SIZE(algs);
1484                         int i, pos;
1485                         algs[0] = algs[1] = algs[2] = 0xff;
1486                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1487                                 algs[0] = WLAN_AUTH_OPEN;
1488                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1489                                 algs[1] = WLAN_AUTH_SHARED_KEY;
1490                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1491                                 algs[2] = WLAN_AUTH_LEAP;
1492                         if (ifmgd->auth_alg == WLAN_AUTH_OPEN)
1493                                 pos = 0;
1494                         else if (ifmgd->auth_alg == WLAN_AUTH_SHARED_KEY)
1495                                 pos = 1;
1496                         else
1497                                 pos = 2;
1498                         for (i = 0; i < num_algs; i++) {
1499                                 pos++;
1500                                 if (pos >= num_algs)
1501                                         pos = 0;
1502                                 if (algs[pos] == ifmgd->auth_alg ||
1503                                     algs[pos] == 0xff)
1504                                         continue;
1505                                 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1506                                     !ieee80211_sta_wep_configured(sdata))
1507                                         continue;
1508                                 ifmgd->auth_alg = algs[pos];
1509                                 break;
1510                         }
1511                 }
1512                 return;
1513         }
1514
1515         switch (ifmgd->auth_alg) {
1516         case WLAN_AUTH_OPEN:
1517         case WLAN_AUTH_LEAP:
1518         case WLAN_AUTH_FT:
1519                 ieee80211_auth_completed(sdata);
1520                 cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, len);
1521                 break;
1522         case WLAN_AUTH_SHARED_KEY:
1523                 if (ifmgd->auth_transaction == 4) {
1524                         ieee80211_auth_completed(sdata);
1525                         cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, len);
1526                 } else
1527                         ieee80211_auth_challenge(sdata, mgmt, len);
1528                 break;
1529         }
1530 }
1531
1532
1533 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1534                                      struct ieee80211_mgmt *mgmt,
1535                                      size_t len)
1536 {
1537         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1538         u16 reason_code;
1539
1540         if (len < 24 + 2)
1541                 return;
1542
1543         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
1544                 return;
1545
1546         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1547
1548         if (ifmgd->flags & IEEE80211_STA_AUTHENTICATED)
1549                 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
1550                                 sdata->dev->name, reason_code);
1551
1552         if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
1553             (ifmgd->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1554              ifmgd->state == IEEE80211_STA_MLME_ASSOCIATE ||
1555              ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)) {
1556                 ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1557                 mod_timer(&ifmgd->timer, jiffies +
1558                                       IEEE80211_RETRY_AUTH_INTERVAL);
1559         }
1560
1561         ieee80211_set_disassoc(sdata, true, false, 0);
1562         ifmgd->flags &= ~IEEE80211_STA_AUTHENTICATED;
1563         cfg80211_send_deauth(sdata->dev, (u8 *) mgmt, len);
1564 }
1565
1566
1567 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1568                                        struct ieee80211_mgmt *mgmt,
1569                                        size_t len)
1570 {
1571         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1572         u16 reason_code;
1573
1574         if (len < 24 + 2)
1575                 return;
1576
1577         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
1578                 return;
1579
1580         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1581
1582         if (ifmgd->flags & IEEE80211_STA_ASSOCIATED)
1583                 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1584                                 sdata->dev->name, reason_code);
1585
1586         if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
1587             ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED) {
1588                 ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE;
1589                 mod_timer(&ifmgd->timer, jiffies +
1590                                       IEEE80211_RETRY_AUTH_INTERVAL);
1591         }
1592
1593         ieee80211_set_disassoc(sdata, false, false, reason_code);
1594         cfg80211_send_disassoc(sdata->dev, (u8 *) mgmt, len);
1595 }
1596
1597
1598 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1599                                          struct ieee80211_mgmt *mgmt,
1600                                          size_t len,
1601                                          int reassoc)
1602 {
1603         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1604         struct ieee80211_local *local = sdata->local;
1605         struct ieee80211_supported_band *sband;
1606         struct sta_info *sta;
1607         u32 rates, basic_rates;
1608         u16 capab_info, status_code, aid;
1609         struct ieee802_11_elems elems;
1610         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1611         u8 *pos;
1612         u32 changed = 0;
1613         int i, j;
1614         bool have_higher_than_11mbit = false, newsta = false;
1615         u16 ap_ht_cap_flags;
1616
1617         /* AssocResp and ReassocResp have identical structure, so process both
1618          * of them in this function. */
1619
1620         if (ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE)
1621                 return;
1622
1623         if (len < 24 + 6)
1624                 return;
1625
1626         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
1627                 return;
1628
1629         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1630         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1631         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1632
1633         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1634                "status=%d aid=%d)\n",
1635                sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1636                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1637
1638         pos = mgmt->u.assoc_resp.variable;
1639         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1640
1641         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1642             elems.timeout_int && elems.timeout_int_len == 5 &&
1643             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1644                 u32 tu, ms;
1645                 tu = get_unaligned_le32(elems.timeout_int + 1);
1646                 ms = tu * 1024 / 1000;
1647                 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1648                        "comeback duration %u TU (%u ms)\n",
1649                        sdata->dev->name, tu, ms);
1650                 if (ms > IEEE80211_ASSOC_TIMEOUT)
1651                         mod_timer(&ifmgd->timer,
1652                                   jiffies + msecs_to_jiffies(ms));
1653                 return;
1654         }
1655
1656         if (status_code != WLAN_STATUS_SUCCESS) {
1657                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1658                        sdata->dev->name, status_code);
1659                 /* if this was a reassociation, ensure we try a "full"
1660                  * association next time. This works around some broken APs
1661                  * which do not correctly reject reassociation requests. */
1662                 ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1663                 cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, len);
1664                 if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
1665                         /* Wait for SME to decide what to do next */
1666                         ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1667                         ieee80211_recalc_idle(local);
1668                 }
1669                 return;
1670         }
1671
1672         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1673                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1674                        "set\n", sdata->dev->name, aid);
1675         aid &= ~(BIT(15) | BIT(14));
1676
1677         if (!elems.supp_rates) {
1678                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1679                        sdata->dev->name);
1680                 return;
1681         }
1682
1683         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1684         ifmgd->aid = aid;
1685         ifmgd->ap_capab = capab_info;
1686
1687         kfree(ifmgd->assocresp_ies);
1688         ifmgd->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1689         ifmgd->assocresp_ies = kmalloc(ifmgd->assocresp_ies_len, GFP_KERNEL);
1690         if (ifmgd->assocresp_ies)
1691                 memcpy(ifmgd->assocresp_ies, pos, ifmgd->assocresp_ies_len);
1692
1693         rcu_read_lock();
1694
1695         /* Add STA entry for the AP */
1696         sta = sta_info_get(local, ifmgd->bssid);
1697         if (!sta) {
1698                 newsta = true;
1699
1700                 sta = sta_info_alloc(sdata, ifmgd->bssid, GFP_ATOMIC);
1701                 if (!sta) {
1702                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1703                                " the AP\n", sdata->dev->name);
1704                         rcu_read_unlock();
1705                         return;
1706                 }
1707
1708                 /* update new sta with its last rx activity */
1709                 sta->last_rx = jiffies;
1710         }
1711
1712         /*
1713          * FIXME: Do we really need to update the sta_info's information here?
1714          *        We already know about the AP (we found it in our list) so it
1715          *        should already be filled with the right info, no?
1716          *        As is stands, all this is racy because typically we assume
1717          *        the information that is filled in here (except flags) doesn't
1718          *        change while a STA structure is alive. As such, it should move
1719          *        to between the sta_info_alloc() and sta_info_insert() above.
1720          */
1721
1722         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP);
1723         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1724                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1725
1726         rates = 0;
1727         basic_rates = 0;
1728         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1729
1730         for (i = 0; i < elems.supp_rates_len; i++) {
1731                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1732                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1733
1734                 if (rate > 110)
1735                         have_higher_than_11mbit = true;
1736
1737                 for (j = 0; j < sband->n_bitrates; j++) {
1738                         if (sband->bitrates[j].bitrate == rate) {
1739                                 rates |= BIT(j);
1740                                 if (is_basic)
1741                                         basic_rates |= BIT(j);
1742                                 break;
1743                         }
1744                 }
1745         }
1746
1747         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1748                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1749                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1750
1751                 if (rate > 110)
1752                         have_higher_than_11mbit = true;
1753
1754                 for (j = 0; j < sband->n_bitrates; j++) {
1755                         if (sband->bitrates[j].bitrate == rate) {
1756                                 rates |= BIT(j);
1757                                 if (is_basic)
1758                                         basic_rates |= BIT(j);
1759                                 break;
1760                         }
1761                 }
1762         }
1763
1764         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1765         sdata->vif.bss_conf.basic_rates = basic_rates;
1766
1767         /* cf. IEEE 802.11 9.2.12 */
1768         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1769             have_higher_than_11mbit)
1770                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1771         else
1772                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1773
1774         /* If TKIP/WEP is used, no need to parse AP's HT capabilities */
1775         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))
1776                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1777                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1778
1779         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1780
1781         rate_control_rate_init(sta);
1782
1783         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1784                 set_sta_flags(sta, WLAN_STA_MFP);
1785
1786         if (elems.wmm_param)
1787                 set_sta_flags(sta, WLAN_STA_WME);
1788
1789         if (newsta) {
1790                 int err = sta_info_insert(sta);
1791                 if (err) {
1792                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1793                                " the AP (error %d)\n", sdata->dev->name, err);
1794                         rcu_read_unlock();
1795                         return;
1796                 }
1797         }
1798
1799         rcu_read_unlock();
1800
1801         if (elems.wmm_param)
1802                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1803                                          elems.wmm_param_len);
1804         else
1805                 ieee80211_set_wmm_default(sdata);
1806
1807         if (elems.ht_info_elem && elems.wmm_param &&
1808             (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
1809             !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))
1810                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1811                                                ap_ht_cap_flags);
1812
1813         /* set AID and assoc capability,
1814          * ieee80211_set_associated() will tell the driver */
1815         bss_conf->aid = aid;
1816         bss_conf->assoc_capability = capab_info;
1817         ieee80211_set_associated(sdata, changed);
1818
1819         /*
1820          * initialise the time of last beacon to be the association time,
1821          * otherwise beacon loss check will trigger immediately
1822          */
1823         ifmgd->last_beacon = jiffies;
1824
1825         ieee80211_associated(sdata);
1826         cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, len);
1827 }
1828
1829
1830 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1831                                   struct ieee80211_mgmt *mgmt,
1832                                   size_t len,
1833                                   struct ieee80211_rx_status *rx_status,
1834                                   struct ieee802_11_elems *elems,
1835                                   bool beacon)
1836 {
1837         struct ieee80211_local *local = sdata->local;
1838         int freq;
1839         struct ieee80211_bss *bss;
1840         struct ieee80211_channel *channel;
1841
1842         if (elems->ds_params && elems->ds_params_len == 1)
1843                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1844         else
1845                 freq = rx_status->freq;
1846
1847         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1848
1849         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1850                 return;
1851
1852         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1853                                         channel, beacon);
1854         if (!bss)
1855                 return;
1856
1857         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1858             (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN) == 0)) {
1859                 struct ieee80211_channel_sw_ie *sw_elem =
1860                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1861                 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1862         }
1863
1864         ieee80211_rx_bss_put(local, bss);
1865 }
1866
1867
1868 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1869                                          struct ieee80211_mgmt *mgmt,
1870                                          size_t len,
1871                                          struct ieee80211_rx_status *rx_status)
1872 {
1873         struct ieee80211_if_managed *ifmgd;
1874         size_t baselen;
1875         struct ieee802_11_elems elems;
1876
1877         ifmgd = &sdata->u.mgd;
1878
1879         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1880                 return; /* ignore ProbeResp to foreign address */
1881
1882         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1883         if (baselen > len)
1884                 return;
1885
1886         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1887                                 &elems);
1888
1889         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1890
1891         /* direct probe may be part of the association flow */
1892         if (ifmgd->state == IEEE80211_STA_MLME_DIRECT_PROBE) {
1893                 printk(KERN_DEBUG "%s direct probe responded\n",
1894                        sdata->dev->name);
1895                 ieee80211_authenticate(sdata);
1896         }
1897
1898         if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) {
1899                 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1900                 mutex_lock(&sdata->local->iflist_mtx);
1901                 ieee80211_recalc_ps(sdata->local, -1);
1902                 mutex_unlock(&sdata->local->iflist_mtx);
1903         }
1904 }
1905
1906 /*
1907  * This is the canonical list of information elements we care about,
1908  * the filter code also gives us all changes to the Microsoft OUI
1909  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1910  *
1911  * We implement beacon filtering in software since that means we can
1912  * avoid processing the frame here and in cfg80211, and userspace
1913  * will not be able to tell whether the hardware supports it or not.
1914  *
1915  * XXX: This list needs to be dynamic -- userspace needs to be able to
1916  *      add items it requires. It also needs to be able to tell us to
1917  *      look out for other vendor IEs.
1918  */
1919 static const u64 care_about_ies =
1920         (1ULL << WLAN_EID_COUNTRY) |
1921         (1ULL << WLAN_EID_ERP_INFO) |
1922         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1923         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1924         (1ULL << WLAN_EID_HT_CAPABILITY) |
1925         (1ULL << WLAN_EID_HT_INFORMATION);
1926
1927 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1928                                      struct ieee80211_mgmt *mgmt,
1929                                      size_t len,
1930                                      struct ieee80211_rx_status *rx_status)
1931 {
1932         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1933         size_t baselen;
1934         struct ieee802_11_elems elems;
1935         struct ieee80211_local *local = sdata->local;
1936         u32 changed = 0;
1937         bool erp_valid, directed_tim = false;
1938         u8 erp_value = 0;
1939         u32 ncrc;
1940
1941         /* Process beacon from the current BSS */
1942         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1943         if (baselen > len)
1944                 return;
1945
1946         if (rx_status->freq != local->hw.conf.channel->center_freq)
1947                 return;
1948
1949         if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED) ||
1950             memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
1951                 return;
1952
1953         if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) {
1954 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1955                 if (net_ratelimit()) {
1956                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1957                                "to a received beacon\n", sdata->dev->name);
1958                 }
1959 #endif
1960                 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1961                 mutex_lock(&local->iflist_mtx);
1962                 ieee80211_recalc_ps(local, -1);
1963                 mutex_unlock(&local->iflist_mtx);
1964         }
1965
1966         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1967         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1968                                           len - baselen, &elems,
1969                                           care_about_ies, ncrc);
1970
1971         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1972                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1973                                                    ifmgd->aid);
1974
1975         if (ncrc != ifmgd->beacon_crc) {
1976                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1977                                       true);
1978
1979                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1980                                          elems.wmm_param_len);
1981         }
1982
1983         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1984                 if (directed_tim) {
1985                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1986                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1987                                 ieee80211_hw_config(local,
1988                                                     IEEE80211_CONF_CHANGE_PS);
1989                                 ieee80211_send_nullfunc(local, sdata, 0);
1990                         } else {
1991                                 local->pspolling = true;
1992
1993                                 /*
1994                                  * Here is assumed that the driver will be
1995                                  * able to send ps-poll frame and receive a
1996                                  * response even though power save mode is
1997                                  * enabled, but some drivers might require
1998                                  * to disable power save here. This needs
1999                                  * to be investigated.
2000                                  */
2001                                 ieee80211_send_pspoll(local, sdata);
2002                         }
2003                 }
2004         }
2005
2006         if (ncrc == ifmgd->beacon_crc)
2007                 return;
2008         ifmgd->beacon_crc = ncrc;
2009
2010         if (elems.erp_info && elems.erp_info_len >= 1) {
2011                 erp_valid = true;
2012                 erp_value = elems.erp_info[0];
2013         } else {
2014                 erp_valid = false;
2015         }
2016         changed |= ieee80211_handle_bss_capability(sdata,
2017                         le16_to_cpu(mgmt->u.beacon.capab_info),
2018                         erp_valid, erp_value);
2019
2020
2021         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
2022             !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED)) {
2023                 struct sta_info *sta;
2024                 struct ieee80211_supported_band *sband;
2025                 u16 ap_ht_cap_flags;
2026
2027                 rcu_read_lock();
2028
2029                 sta = sta_info_get(local, ifmgd->bssid);
2030                 if (!sta) {
2031                         rcu_read_unlock();
2032                         return;
2033                 }
2034
2035                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2036
2037                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
2038                                 elems.ht_cap_elem, &sta->sta.ht_cap);
2039
2040                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
2041
2042                 rcu_read_unlock();
2043
2044                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
2045                                                ap_ht_cap_flags);
2046         }
2047
2048         if (elems.country_elem) {
2049                 /* Note we are only reviewing this on beacons
2050                  * for the BSSID we are associated to */
2051                 regulatory_hint_11d(local->hw.wiphy,
2052                         elems.country_elem, elems.country_elem_len);
2053
2054                 /* TODO: IBSS also needs this */
2055                 if (elems.pwr_constr_elem)
2056                         ieee80211_handle_pwr_constr(sdata,
2057                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
2058                                 elems.pwr_constr_elem,
2059                                 elems.pwr_constr_elem_len);
2060         }
2061
2062         ieee80211_bss_info_change_notify(sdata, changed);
2063 }
2064
2065 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
2066                                           struct sk_buff *skb,
2067                                           struct ieee80211_rx_status *rx_status)
2068 {
2069         struct ieee80211_local *local = sdata->local;
2070         struct ieee80211_mgmt *mgmt;
2071         u16 fc;
2072
2073         if (skb->len < 24)
2074                 return RX_DROP_MONITOR;
2075
2076         mgmt = (struct ieee80211_mgmt *) skb->data;
2077         fc = le16_to_cpu(mgmt->frame_control);
2078
2079         switch (fc & IEEE80211_FCTL_STYPE) {
2080         case IEEE80211_STYPE_PROBE_REQ:
2081         case IEEE80211_STYPE_PROBE_RESP:
2082         case IEEE80211_STYPE_BEACON:
2083                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
2084         case IEEE80211_STYPE_AUTH:
2085         case IEEE80211_STYPE_ASSOC_RESP:
2086         case IEEE80211_STYPE_REASSOC_RESP:
2087         case IEEE80211_STYPE_DEAUTH:
2088         case IEEE80211_STYPE_DISASSOC:
2089                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
2090                 queue_work(local->hw.workqueue, &sdata->u.mgd.work);
2091                 return RX_QUEUED;
2092         }
2093
2094         return RX_DROP_MONITOR;
2095 }
2096
2097 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2098                                          struct sk_buff *skb)
2099 {
2100         struct ieee80211_rx_status *rx_status;
2101         struct ieee80211_mgmt *mgmt;
2102         u16 fc;
2103
2104         rx_status = (struct ieee80211_rx_status *) skb->cb;
2105         mgmt = (struct ieee80211_mgmt *) skb->data;
2106         fc = le16_to_cpu(mgmt->frame_control);
2107
2108         switch (fc & IEEE80211_FCTL_STYPE) {
2109         case IEEE80211_STYPE_PROBE_RESP:
2110                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
2111                                              rx_status);
2112                 break;
2113         case IEEE80211_STYPE_BEACON:
2114                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
2115                                          rx_status);
2116                 break;
2117         case IEEE80211_STYPE_AUTH:
2118                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
2119                 break;
2120         case IEEE80211_STYPE_ASSOC_RESP:
2121                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 0);
2122                 break;
2123         case IEEE80211_STYPE_REASSOC_RESP:
2124                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 1);
2125                 break;
2126         case IEEE80211_STYPE_DEAUTH:
2127                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
2128                 break;
2129         case IEEE80211_STYPE_DISASSOC:
2130                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
2131                 break;
2132         }
2133
2134         kfree_skb(skb);
2135 }
2136
2137 static void ieee80211_sta_timer(unsigned long data)
2138 {
2139         struct ieee80211_sub_if_data *sdata =
2140                 (struct ieee80211_sub_if_data *) data;
2141         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2142         struct ieee80211_local *local = sdata->local;
2143
2144         if (local->quiescing) {
2145                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2146                 return;
2147         }
2148
2149         set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
2150         queue_work(local->hw.workqueue, &ifmgd->work);
2151 }
2152
2153 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata)
2154 {
2155         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2156         struct ieee80211_local *local = sdata->local;
2157
2158         /* Reset own TSF to allow time synchronization work. */
2159         drv_reset_tsf(local);
2160
2161         ifmgd->wmm_last_param_set = -1; /* allow any WMM update */
2162
2163
2164         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN)
2165                 ifmgd->auth_alg = WLAN_AUTH_OPEN;
2166         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
2167                 ifmgd->auth_alg = WLAN_AUTH_SHARED_KEY;
2168         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP)
2169                 ifmgd->auth_alg = WLAN_AUTH_LEAP;
2170         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_FT)
2171                 ifmgd->auth_alg = WLAN_AUTH_FT;
2172         else
2173                 ifmgd->auth_alg = WLAN_AUTH_OPEN;
2174         ifmgd->auth_transaction = -1;
2175         ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
2176         ifmgd->assoc_scan_tries = 0;
2177         ifmgd->direct_probe_tries = 0;
2178         ifmgd->auth_tries = 0;
2179         ifmgd->assoc_tries = 0;
2180         netif_tx_stop_all_queues(sdata->dev);
2181         netif_carrier_off(sdata->dev);
2182 }
2183
2184 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata)
2185 {
2186         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2187         struct ieee80211_local *local = sdata->local;
2188         struct ieee80211_bss *bss;
2189         u8 *bssid = ifmgd->bssid, *ssid = ifmgd->ssid;
2190         u8 ssid_len = ifmgd->ssid_len;
2191         u16 capa_mask = WLAN_CAPABILITY_ESS;
2192         u16 capa_val = WLAN_CAPABILITY_ESS;
2193         struct ieee80211_channel *chan = local->oper_channel;
2194
2195         if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
2196             ifmgd->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2197                             IEEE80211_STA_AUTO_BSSID_SEL |
2198                             IEEE80211_STA_AUTO_CHANNEL_SEL)) {
2199                 capa_mask |= WLAN_CAPABILITY_PRIVACY;
2200                 if (sdata->default_key)
2201                         capa_val |= WLAN_CAPABILITY_PRIVACY;
2202         }
2203
2204         if (ifmgd->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2205                 chan = NULL;
2206
2207         if (ifmgd->flags & IEEE80211_STA_AUTO_BSSID_SEL)
2208                 bssid = NULL;
2209
2210         if (ifmgd->flags & IEEE80211_STA_AUTO_SSID_SEL) {
2211                 ssid = NULL;
2212                 ssid_len = 0;
2213         }
2214
2215         bss = (void *)cfg80211_get_bss(local->hw.wiphy, chan,
2216                                        bssid, ssid, ssid_len,
2217                                        capa_mask, capa_val);
2218
2219         if (bss) {
2220                 local->oper_channel = bss->cbss.channel;
2221                 local->oper_channel_type = NL80211_CHAN_NO_HT;
2222                 ieee80211_hw_config(local, 0);
2223
2224                 if (!(ifmgd->flags & IEEE80211_STA_SSID_SET))
2225                         ieee80211_sta_set_ssid(sdata, bss->ssid,
2226                                                bss->ssid_len);
2227                 ieee80211_sta_set_bssid(sdata, bss->cbss.bssid);
2228                 ieee80211_sta_def_wmm_params(sdata, bss->supp_rates_len,
2229                                                     bss->supp_rates);
2230                 if (sdata->u.mgd.mfp == IEEE80211_MFP_REQUIRED)
2231                         sdata->u.mgd.flags |= IEEE80211_STA_MFP_ENABLED;
2232                 else
2233                         sdata->u.mgd.flags &= ~IEEE80211_STA_MFP_ENABLED;
2234
2235                 /* Send out direct probe if no probe resp was received or
2236                  * the one we have is outdated
2237                  */
2238                 if (!bss->last_probe_resp ||
2239                     time_after(jiffies, bss->last_probe_resp
2240                                         + IEEE80211_SCAN_RESULT_EXPIRE))
2241                         ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2242                 else
2243                         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
2244
2245                 ieee80211_rx_bss_put(local, bss);
2246                 ieee80211_sta_reset_auth(sdata);
2247                 return 0;
2248         } else {
2249                 if (ifmgd->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2250
2251                         ifmgd->assoc_scan_tries++;
2252
2253                         ieee80211_request_internal_scan(sdata, ifmgd->ssid,
2254                                                         ssid_len);
2255
2256                         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
2257                         set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
2258                 } else {
2259                         ifmgd->assoc_scan_tries = 0;
2260                         ifmgd->state = IEEE80211_STA_MLME_DISABLED;
2261                         ieee80211_recalc_idle(local);
2262                 }
2263         }
2264         return -1;
2265 }
2266
2267
2268 static void ieee80211_sta_work(struct work_struct *work)
2269 {
2270         struct ieee80211_sub_if_data *sdata =
2271                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
2272         struct ieee80211_local *local = sdata->local;
2273         struct ieee80211_if_managed *ifmgd;
2274         struct sk_buff *skb;
2275
2276         if (!netif_running(sdata->dev))
2277                 return;
2278
2279         if (local->sw_scanning || local->hw_scanning)
2280                 return;
2281
2282         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2283                 return;
2284
2285         /*
2286          * Nothing should have been stuffed into the workqueue during
2287          * the suspend->resume cycle. If this WARN is seen then there
2288          * is a bug with either the driver suspend or something in
2289          * mac80211 stuffing into the workqueue which we haven't yet
2290          * cleared during mac80211's suspend cycle.
2291          */
2292         if (WARN_ON(local->suspended))
2293                 return;
2294
2295         ifmgd = &sdata->u.mgd;
2296
2297         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
2298                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2299
2300         if (ifmgd->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2301             ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2302             ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE &&
2303             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request)) {
2304                 queue_delayed_work(local->hw.workqueue, &local->scan_work,
2305                                    round_jiffies_relative(0));
2306                 return;
2307         }
2308
2309         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request)) {
2310                 if (ieee80211_sta_config_auth(sdata))
2311                         return;
2312                 clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
2313         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request))
2314                 return;
2315
2316         ieee80211_recalc_idle(local);
2317
2318         switch (ifmgd->state) {
2319         case IEEE80211_STA_MLME_DISABLED:
2320                 break;
2321         case IEEE80211_STA_MLME_DIRECT_PROBE:
2322                 ieee80211_direct_probe(sdata);
2323                 break;
2324         case IEEE80211_STA_MLME_AUTHENTICATE:
2325                 ieee80211_authenticate(sdata);
2326                 break;
2327         case IEEE80211_STA_MLME_ASSOCIATE:
2328                 ieee80211_associate(sdata);
2329                 break;
2330         case IEEE80211_STA_MLME_ASSOCIATED:
2331                 ieee80211_associated(sdata);
2332                 break;
2333         default:
2334                 WARN_ON(1);
2335                 break;
2336         }
2337
2338         if (ieee80211_privacy_mismatch(sdata)) {
2339                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2340                        "mixed-cell disabled - disassociate\n", sdata->dev->name);
2341
2342                 ieee80211_set_disassoc(sdata, false, true,
2343                                         WLAN_REASON_UNSPECIFIED);
2344         }
2345 }
2346
2347 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2348 {
2349         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2350                 /*
2351                  * Need to update last_beacon to avoid beacon loss
2352                  * test to trigger.
2353                  */
2354                 sdata->u.mgd.last_beacon = jiffies;
2355
2356
2357                 queue_work(sdata->local->hw.workqueue,
2358                            &sdata->u.mgd.work);
2359         }
2360 }
2361
2362 #ifdef CONFIG_PM
2363 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2364 {
2365         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2366
2367         /*
2368          * we need to use atomic bitops for the running bits
2369          * only because both timers might fire at the same
2370          * time -- the code here is properly synchronised.
2371          */
2372
2373         cancel_work_sync(&ifmgd->work);
2374         cancel_work_sync(&ifmgd->beacon_loss_work);
2375         if (del_timer_sync(&ifmgd->timer))
2376                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2377
2378         cancel_work_sync(&ifmgd->chswitch_work);
2379         if (del_timer_sync(&ifmgd->chswitch_timer))
2380                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2381 }
2382
2383 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2384 {
2385         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2386
2387         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2388                 add_timer(&ifmgd->timer);
2389         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2390                 add_timer(&ifmgd->chswitch_timer);
2391 }
2392 #endif
2393
2394 /* interface setup */
2395 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2396 {
2397         struct ieee80211_if_managed *ifmgd;
2398         u32 hw_flags;
2399
2400         ifmgd = &sdata->u.mgd;
2401         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
2402         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2403         INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
2404         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2405                     (unsigned long) sdata);
2406         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2407                     (unsigned long) sdata);
2408         skb_queue_head_init(&ifmgd->skb_queue);
2409
2410         ifmgd->capab = WLAN_CAPABILITY_ESS;
2411         ifmgd->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2412                 IEEE80211_AUTH_ALG_SHARED_KEY;
2413         ifmgd->flags |= IEEE80211_STA_CREATE_IBSS |
2414                 IEEE80211_STA_AUTO_BSSID_SEL |
2415                 IEEE80211_STA_AUTO_CHANNEL_SEL;
2416         if (sdata->local->hw.queues >= 4)
2417                 ifmgd->flags |= IEEE80211_STA_WMM_ENABLED;
2418
2419         hw_flags = sdata->local->hw.flags;
2420
2421         if (hw_flags & IEEE80211_HW_SUPPORTS_PS) {
2422                 ifmgd->powersave = CONFIG_MAC80211_DEFAULT_PS_VALUE;
2423                 sdata->local->hw.conf.dynamic_ps_timeout = 500;
2424         }
2425 }
2426
2427 /* configuration hooks */
2428 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata)
2429 {
2430         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2431         struct ieee80211_local *local = sdata->local;
2432
2433         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2434                 return;
2435
2436         if ((ifmgd->flags & (IEEE80211_STA_BSSID_SET |
2437                              IEEE80211_STA_AUTO_BSSID_SEL)) &&
2438             (ifmgd->flags & (IEEE80211_STA_SSID_SET |
2439                              IEEE80211_STA_AUTO_SSID_SEL))) {
2440
2441                 if (ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)
2442                         ieee80211_set_disassoc(sdata, true, true,
2443                                                WLAN_REASON_DEAUTH_LEAVING);
2444
2445                 if (ifmgd->ssid_len == 0) {
2446                         /*
2447                          * Only allow association to be started if a valid SSID
2448                          * is configured.
2449                          */
2450                         return;
2451                 }
2452
2453                 if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) ||
2454                     ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE)
2455                         set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
2456                 else if (ifmgd->flags & IEEE80211_STA_EXT_SME)
2457                         set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
2458                 queue_work(local->hw.workqueue, &ifmgd->work);
2459         }
2460 }
2461
2462 int ieee80211_sta_commit(struct ieee80211_sub_if_data *sdata)
2463 {
2464         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2465
2466         if (ifmgd->ssid_len)
2467                 ifmgd->flags |= IEEE80211_STA_SSID_SET;
2468         else
2469                 ifmgd->flags &= ~IEEE80211_STA_SSID_SET;
2470
2471         return 0;
2472 }
2473
2474 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2475 {
2476         struct ieee80211_if_managed *ifmgd;
2477
2478         if (len > IEEE80211_MAX_SSID_LEN)
2479                 return -EINVAL;
2480
2481         ifmgd = &sdata->u.mgd;
2482
2483         if (ifmgd->ssid_len != len || memcmp(ifmgd->ssid, ssid, len) != 0) {
2484                 if (ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)
2485                         ieee80211_set_disassoc(sdata, true, true,
2486                                                WLAN_REASON_DEAUTH_LEAVING);
2487
2488                 /*
2489                  * Do not use reassociation if SSID is changed (different ESS).
2490                  */
2491                 ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2492                 memset(ifmgd->ssid, 0, sizeof(ifmgd->ssid));
2493                 memcpy(ifmgd->ssid, ssid, len);
2494                 ifmgd->ssid_len = len;
2495         }
2496
2497         return ieee80211_sta_commit(sdata);
2498 }
2499
2500 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2501 {
2502         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2503         memcpy(ssid, ifmgd->ssid, ifmgd->ssid_len);
2504         *len = ifmgd->ssid_len;
2505         return 0;
2506 }
2507
2508 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2509 {
2510         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2511
2512         if (compare_ether_addr(bssid, ifmgd->bssid) != 0 &&
2513             ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)
2514                 ieee80211_set_disassoc(sdata, true, true,
2515                                        WLAN_REASON_DEAUTH_LEAVING);
2516
2517         if (is_valid_ether_addr(bssid)) {
2518                 memcpy(ifmgd->bssid, bssid, ETH_ALEN);
2519                 ifmgd->flags |= IEEE80211_STA_BSSID_SET;
2520         } else {
2521                 memset(ifmgd->bssid, 0, ETH_ALEN);
2522                 ifmgd->flags &= ~IEEE80211_STA_BSSID_SET;
2523         }
2524
2525         return ieee80211_sta_commit(sdata);
2526 }
2527
2528 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata,
2529                                const char *ie, size_t len)
2530 {
2531         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2532
2533         if (len == 0 && ifmgd->extra_ie_len == 0)
2534                 return -EALREADY;
2535
2536         if (len == ifmgd->extra_ie_len && ifmgd->extra_ie &&
2537             memcmp(ifmgd->extra_ie, ie, len) == 0)
2538                 return -EALREADY;
2539
2540         kfree(ifmgd->extra_ie);
2541         if (len == 0) {
2542                 ifmgd->extra_ie = NULL;
2543                 ifmgd->extra_ie_len = 0;
2544                 return 0;
2545         }
2546         ifmgd->extra_ie = kmalloc(len, GFP_KERNEL);
2547         if (!ifmgd->extra_ie) {
2548                 ifmgd->extra_ie_len = 0;
2549                 return -ENOMEM;
2550         }
2551         memcpy(ifmgd->extra_ie, ie, len);
2552         ifmgd->extra_ie_len = len;
2553         return 0;
2554 }
2555
2556 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2557 {
2558         printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2559                sdata->dev->name, reason);
2560
2561         ieee80211_set_disassoc(sdata, true, true, reason);
2562         return 0;
2563 }
2564
2565 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2566 {
2567         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2568
2569         printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2570                sdata->dev->name, reason);
2571
2572         if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED))
2573                 return -ENOLINK;
2574
2575         ieee80211_set_disassoc(sdata, false, true, reason);
2576         return 0;
2577 }
2578
2579 /* scan finished notification */
2580 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2581 {
2582         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2583
2584         /* Restart STA timers */
2585         rcu_read_lock();
2586         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2587                 ieee80211_restart_sta_timer(sdata);
2588         rcu_read_unlock();
2589 }
2590
2591 int ieee80211_max_network_latency(struct notifier_block *nb,
2592                                   unsigned long data, void *dummy)
2593 {
2594         s32 latency_usec = (s32) data;
2595         struct ieee80211_local *local =
2596                 container_of(nb, struct ieee80211_local,
2597                              network_latency_notifier);
2598
2599         mutex_lock(&local->iflist_mtx);
2600         ieee80211_recalc_ps(local, latency_usec);
2601         mutex_unlock(&local->iflist_mtx);
2602
2603         return 0;
2604 }