Merge branch 'master' of /home/davem/src/GIT/linux-2.6/
[linux-2.6.git] / net / mac80211 / mlme.c
1 /*
2  * BSS client mode implementation
3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4  * Copyright 2004, Instant802 Networks, Inc.
5  * Copyright 2005, Devicescape Software, Inc.
6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License version 2 as
11  * published by the Free Software Foundation.
12  */
13
14 #include <linux/delay.h>
15 #include <linux/if_ether.h>
16 #include <linux/skbuff.h>
17 #include <linux/if_arp.h>
18 #include <linux/etherdevice.h>
19 #include <linux/rtnetlink.h>
20 #include <linux/pm_qos_params.h>
21 #include <linux/crc32.h>
22 #include <net/mac80211.h>
23 #include <asm/unaligned.h>
24
25 #include "ieee80211_i.h"
26 #include "driver-ops.h"
27 #include "rate.h"
28 #include "led.h"
29
30 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
31 #define IEEE80211_AUTH_MAX_TRIES 3
32 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
33 #define IEEE80211_ASSOC_MAX_TRIES 3
34 #define IEEE80211_MAX_PROBE_TRIES 5
35
36 /*
37  * beacon loss detection timeout
38  * XXX: should depend on beacon interval
39  */
40 #define IEEE80211_BEACON_LOSS_TIME      (2 * HZ)
41 /*
42  * Time the connection can be idle before we probe
43  * it to see if we can still talk to the AP.
44  */
45 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
46 /*
47  * Time we wait for a probe response after sending
48  * a probe request because of beacon loss or for
49  * checking the connection still works.
50  */
51 #define IEEE80211_PROBE_WAIT            (HZ / 2)
52
53 #define TMR_RUNNING_TIMER       0
54 #define TMR_RUNNING_CHANSW      1
55
56 /*
57  * All cfg80211 functions have to be called outside a locked
58  * section so that they can acquire a lock themselves... This
59  * is much simpler than queuing up things in cfg80211, but we
60  * do need some indirection for that here.
61  */
62 enum rx_mgmt_action {
63         /* no action required */
64         RX_MGMT_NONE,
65
66         /* caller must call cfg80211_send_rx_auth() */
67         RX_MGMT_CFG80211_AUTH,
68
69         /* caller must call cfg80211_send_rx_assoc() */
70         RX_MGMT_CFG80211_ASSOC,
71
72         /* caller must call cfg80211_send_deauth() */
73         RX_MGMT_CFG80211_DEAUTH,
74
75         /* caller must call cfg80211_send_disassoc() */
76         RX_MGMT_CFG80211_DISASSOC,
77
78         /* caller must call cfg80211_auth_timeout() & free work */
79         RX_MGMT_CFG80211_AUTH_TO,
80
81         /* caller must call cfg80211_assoc_timeout() & free work */
82         RX_MGMT_CFG80211_ASSOC_TO,
83 };
84
85 /* utils */
86 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
87 {
88         WARN_ON(!mutex_is_locked(&ifmgd->mtx));
89 }
90
91 /*
92  * We can have multiple work items (and connection probing)
93  * scheduling this timer, but we need to take care to only
94  * reschedule it when it should fire _earlier_ than it was
95  * asked for before, or if it's not pending right now. This
96  * function ensures that. Note that it then is required to
97  * run this function for all timeouts after the first one
98  * has happened -- the work that runs from this timer will
99  * do that.
100  */
101 static void run_again(struct ieee80211_if_managed *ifmgd,
102                              unsigned long timeout)
103 {
104         ASSERT_MGD_MTX(ifmgd);
105
106         if (!timer_pending(&ifmgd->timer) ||
107             time_before(timeout, ifmgd->timer.expires))
108                 mod_timer(&ifmgd->timer, timeout);
109 }
110
111 static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata)
112 {
113         if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
114                 return;
115
116         mod_timer(&sdata->u.mgd.bcn_mon_timer,
117                   round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME));
118 }
119
120 static int ecw2cw(int ecw)
121 {
122         return (1 << ecw) - 1;
123 }
124
125 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
126                                       struct ieee80211_supported_band *sband,
127                                       u32 *rates)
128 {
129         int i, j, count;
130         *rates = 0;
131         count = 0;
132         for (i = 0; i < bss->supp_rates_len; i++) {
133                 int rate = (bss->supp_rates[i] & 0x7F) * 5;
134
135                 for (j = 0; j < sband->n_bitrates; j++)
136                         if (sband->bitrates[j].bitrate == rate) {
137                                 *rates |= BIT(j);
138                                 count++;
139                                 break;
140                         }
141         }
142
143         return count;
144 }
145
146 /*
147  * ieee80211_enable_ht should be called only after the operating band
148  * has been determined as ht configuration depends on the hw's
149  * HT abilities for a specific band.
150  */
151 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
152                                struct ieee80211_ht_info *hti,
153                                const u8 *bssid, u16 ap_ht_cap_flags)
154 {
155         struct ieee80211_local *local = sdata->local;
156         struct ieee80211_supported_band *sband;
157         struct sta_info *sta;
158         u32 changed = 0;
159         u16 ht_opmode;
160         bool enable_ht = true, ht_changed;
161         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
162
163         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
164
165         /* HT is not supported */
166         if (!sband->ht_cap.ht_supported)
167                 enable_ht = false;
168
169         /* check that channel matches the right operating channel */
170         if (local->hw.conf.channel->center_freq !=
171             ieee80211_channel_to_frequency(hti->control_chan))
172                 enable_ht = false;
173
174         if (enable_ht) {
175                 channel_type = NL80211_CHAN_HT20;
176
177                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
178                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
179                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
180                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
181                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
182                                 if (!(local->hw.conf.channel->flags &
183                                     IEEE80211_CHAN_NO_HT40PLUS))
184                                         channel_type = NL80211_CHAN_HT40PLUS;
185                                 break;
186                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
187                                 if (!(local->hw.conf.channel->flags &
188                                     IEEE80211_CHAN_NO_HT40MINUS))
189                                         channel_type = NL80211_CHAN_HT40MINUS;
190                                 break;
191                         }
192                 }
193         }
194
195         ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
196                      channel_type != local->hw.conf.channel_type;
197
198         local->oper_channel_type = channel_type;
199
200         if (ht_changed) {
201                 /* channel_type change automatically detected */
202                 ieee80211_hw_config(local, 0);
203
204                 rcu_read_lock();
205                 sta = sta_info_get(local, bssid);
206                 if (sta)
207                         rate_control_rate_update(local, sband, sta,
208                                                  IEEE80211_RC_HT_CHANGED);
209                 rcu_read_unlock();
210         }
211
212         /* disable HT */
213         if (!enable_ht)
214                 return 0;
215
216         ht_opmode = le16_to_cpu(hti->operation_mode);
217
218         /* if bss configuration changed store the new one */
219         if (!sdata->ht_opmode_valid ||
220             sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
221                 changed |= BSS_CHANGED_HT;
222                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
223                 sdata->ht_opmode_valid = true;
224         }
225
226         return changed;
227 }
228
229 /* frame sending functions */
230
231 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
232                                  struct ieee80211_mgd_work *wk)
233 {
234         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
235         struct ieee80211_local *local = sdata->local;
236         struct sk_buff *skb;
237         struct ieee80211_mgmt *mgmt;
238         u8 *pos;
239         const u8 *ies, *ht_ie;
240         int i, len, count, rates_len, supp_rates_len;
241         u16 capab;
242         int wmm = 0;
243         struct ieee80211_supported_band *sband;
244         u32 rates = 0;
245
246         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
247                             sizeof(*mgmt) + 200 + wk->ie_len +
248                             wk->ssid_len);
249         if (!skb) {
250                 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
251                        "frame\n", sdata->dev->name);
252                 return;
253         }
254         skb_reserve(skb, local->hw.extra_tx_headroom);
255
256         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
257
258         capab = ifmgd->capab;
259
260         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
261                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
262                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
263                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
264                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
265         }
266
267         if (wk->bss->cbss.capability & WLAN_CAPABILITY_PRIVACY)
268                 capab |= WLAN_CAPABILITY_PRIVACY;
269         if (wk->bss->wmm_used)
270                 wmm = 1;
271
272         /* get all rates supported by the device and the AP as
273          * some APs don't like getting a superset of their rates
274          * in the association request (e.g. D-Link DAP 1353 in
275          * b-only mode) */
276         rates_len = ieee80211_compatible_rates(wk->bss, sband, &rates);
277
278         if ((wk->bss->cbss.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
279             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
280                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
281
282         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
283         memset(mgmt, 0, 24);
284         memcpy(mgmt->da, wk->bss->cbss.bssid, ETH_ALEN);
285         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
286         memcpy(mgmt->bssid, wk->bss->cbss.bssid, ETH_ALEN);
287
288         if (!is_zero_ether_addr(wk->prev_bssid)) {
289                 skb_put(skb, 10);
290                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
291                                                   IEEE80211_STYPE_REASSOC_REQ);
292                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
293                 mgmt->u.reassoc_req.listen_interval =
294                                 cpu_to_le16(local->hw.conf.listen_interval);
295                 memcpy(mgmt->u.reassoc_req.current_ap, wk->prev_bssid,
296                        ETH_ALEN);
297         } else {
298                 skb_put(skb, 4);
299                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
300                                                   IEEE80211_STYPE_ASSOC_REQ);
301                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
302                 mgmt->u.assoc_req.listen_interval =
303                                 cpu_to_le16(local->hw.conf.listen_interval);
304         }
305
306         /* SSID */
307         ies = pos = skb_put(skb, 2 + wk->ssid_len);
308         *pos++ = WLAN_EID_SSID;
309         *pos++ = wk->ssid_len;
310         memcpy(pos, wk->ssid, wk->ssid_len);
311
312         /* add all rates which were marked to be used above */
313         supp_rates_len = rates_len;
314         if (supp_rates_len > 8)
315                 supp_rates_len = 8;
316
317         len = sband->n_bitrates;
318         pos = skb_put(skb, supp_rates_len + 2);
319         *pos++ = WLAN_EID_SUPP_RATES;
320         *pos++ = supp_rates_len;
321
322         count = 0;
323         for (i = 0; i < sband->n_bitrates; i++) {
324                 if (BIT(i) & rates) {
325                         int rate = sband->bitrates[i].bitrate;
326                         *pos++ = (u8) (rate / 5);
327                         if (++count == 8)
328                                 break;
329                 }
330         }
331
332         if (rates_len > count) {
333                 pos = skb_put(skb, rates_len - count + 2);
334                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
335                 *pos++ = rates_len - count;
336
337                 for (i++; i < sband->n_bitrates; i++) {
338                         if (BIT(i) & rates) {
339                                 int rate = sband->bitrates[i].bitrate;
340                                 *pos++ = (u8) (rate / 5);
341                         }
342                 }
343         }
344
345         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
346                 /* 1. power capabilities */
347                 pos = skb_put(skb, 4);
348                 *pos++ = WLAN_EID_PWR_CAPABILITY;
349                 *pos++ = 2;
350                 *pos++ = 0; /* min tx power */
351                 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
352
353                 /* 2. supported channels */
354                 /* TODO: get this in reg domain format */
355                 pos = skb_put(skb, 2 * sband->n_channels + 2);
356                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
357                 *pos++ = 2 * sband->n_channels;
358                 for (i = 0; i < sband->n_channels; i++) {
359                         *pos++ = ieee80211_frequency_to_channel(
360                                         sband->channels[i].center_freq);
361                         *pos++ = 1; /* one channel in the subband*/
362                 }
363         }
364
365         if (wk->ie_len && wk->ie) {
366                 pos = skb_put(skb, wk->ie_len);
367                 memcpy(pos, wk->ie, wk->ie_len);
368         }
369
370         if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED)) {
371                 pos = skb_put(skb, 9);
372                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
373                 *pos++ = 7; /* len */
374                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
375                 *pos++ = 0x50;
376                 *pos++ = 0xf2;
377                 *pos++ = 2; /* WME */
378                 *pos++ = 0; /* WME info */
379                 *pos++ = 1; /* WME ver */
380                 *pos++ = 0;
381         }
382
383         /* wmm support is a must to HT */
384         /*
385          * IEEE802.11n does not allow TKIP/WEP as pairwise
386          * ciphers in HT mode. We still associate in non-ht
387          * mode (11a/b/g) if any one of these ciphers is
388          * configured as pairwise.
389          */
390         if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
391             sband->ht_cap.ht_supported &&
392             (ht_ie = ieee80211_bss_get_ie(&wk->bss->cbss, WLAN_EID_HT_INFORMATION)) &&
393             ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
394             (!(ifmgd->flags & IEEE80211_STA_DISABLE_11N))) {
395                 struct ieee80211_ht_info *ht_info =
396                         (struct ieee80211_ht_info *)(ht_ie + 2);
397                 u16 cap = sband->ht_cap.cap;
398                 __le16 tmp;
399                 u32 flags = local->hw.conf.channel->flags;
400
401                 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
402                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
403                         if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
404                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
405                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
406                         }
407                         break;
408                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
409                         if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
410                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
411                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
412                         }
413                         break;
414                 }
415
416                 tmp = cpu_to_le16(cap);
417                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
418                 *pos++ = WLAN_EID_HT_CAPABILITY;
419                 *pos++ = sizeof(struct ieee80211_ht_cap);
420                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
421                 memcpy(pos, &tmp, sizeof(u16));
422                 pos += sizeof(u16);
423                 /* TODO: needs a define here for << 2 */
424                 *pos++ = sband->ht_cap.ampdu_factor |
425                          (sband->ht_cap.ampdu_density << 2);
426                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
427         }
428
429         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
430         ieee80211_tx_skb(sdata, skb);
431 }
432
433
434 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
435                                            const u8 *bssid, u16 stype, u16 reason,
436                                            void *cookie)
437 {
438         struct ieee80211_local *local = sdata->local;
439         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
440         struct sk_buff *skb;
441         struct ieee80211_mgmt *mgmt;
442
443         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
444         if (!skb) {
445                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
446                        "deauth/disassoc frame\n", sdata->dev->name);
447                 return;
448         }
449         skb_reserve(skb, local->hw.extra_tx_headroom);
450
451         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
452         memset(mgmt, 0, 24);
453         memcpy(mgmt->da, bssid, ETH_ALEN);
454         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
455         memcpy(mgmt->bssid, bssid, ETH_ALEN);
456         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
457         skb_put(skb, 2);
458         /* u.deauth.reason_code == u.disassoc.reason_code */
459         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
460
461         if (stype == IEEE80211_STYPE_DEAUTH)
462                 if (cookie)
463                         __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
464                 else
465                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
466         else
467                 if (cookie)
468                         __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
469                 else
470                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
471         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
472                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
473         ieee80211_tx_skb(sdata, skb);
474 }
475
476 void ieee80211_send_pspoll(struct ieee80211_local *local,
477                            struct ieee80211_sub_if_data *sdata)
478 {
479         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
480         struct ieee80211_pspoll *pspoll;
481         struct sk_buff *skb;
482         u16 fc;
483
484         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
485         if (!skb) {
486                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
487                        "pspoll frame\n", sdata->dev->name);
488                 return;
489         }
490         skb_reserve(skb, local->hw.extra_tx_headroom);
491
492         pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
493         memset(pspoll, 0, sizeof(*pspoll));
494         fc = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL | IEEE80211_FCTL_PM;
495         pspoll->frame_control = cpu_to_le16(fc);
496         pspoll->aid = cpu_to_le16(ifmgd->aid);
497
498         /* aid in PS-Poll has its two MSBs each set to 1 */
499         pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
500
501         memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
502         memcpy(pspoll->ta, sdata->dev->dev_addr, ETH_ALEN);
503
504         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
505         ieee80211_tx_skb(sdata, skb);
506 }
507
508 void ieee80211_send_nullfunc(struct ieee80211_local *local,
509                              struct ieee80211_sub_if_data *sdata,
510                              int powersave)
511 {
512         struct sk_buff *skb;
513         struct ieee80211_hdr *nullfunc;
514         __le16 fc;
515
516         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
517                 return;
518
519         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
520         if (!skb) {
521                 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
522                        "frame\n", sdata->dev->name);
523                 return;
524         }
525         skb_reserve(skb, local->hw.extra_tx_headroom);
526
527         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
528         memset(nullfunc, 0, 24);
529         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
530                          IEEE80211_FCTL_TODS);
531         if (powersave)
532                 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
533         nullfunc->frame_control = fc;
534         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
535         memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
536         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
537
538         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
539         ieee80211_tx_skb(sdata, skb);
540 }
541
542 /* spectrum management related things */
543 static void ieee80211_chswitch_work(struct work_struct *work)
544 {
545         struct ieee80211_sub_if_data *sdata =
546                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
547         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
548
549         if (!netif_running(sdata->dev))
550                 return;
551
552         mutex_lock(&ifmgd->mtx);
553         if (!ifmgd->associated)
554                 goto out;
555
556         sdata->local->oper_channel = sdata->local->csa_channel;
557         ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL);
558
559         /* XXX: shouldn't really modify cfg80211-owned data! */
560         ifmgd->associated->cbss.channel = sdata->local->oper_channel;
561
562         ieee80211_wake_queues_by_reason(&sdata->local->hw,
563                                         IEEE80211_QUEUE_STOP_REASON_CSA);
564  out:
565         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
566         mutex_unlock(&ifmgd->mtx);
567 }
568
569 static void ieee80211_chswitch_timer(unsigned long data)
570 {
571         struct ieee80211_sub_if_data *sdata =
572                 (struct ieee80211_sub_if_data *) data;
573         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
574
575         if (sdata->local->quiescing) {
576                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
577                 return;
578         }
579
580         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
581 }
582
583 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
584                                       struct ieee80211_channel_sw_ie *sw_elem,
585                                       struct ieee80211_bss *bss)
586 {
587         struct ieee80211_channel *new_ch;
588         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
589         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
590
591         ASSERT_MGD_MTX(ifmgd);
592
593         if (!ifmgd->associated)
594                 return;
595
596         if (sdata->local->scanning)
597                 return;
598
599         /* Disregard subsequent beacons if we are already running a timer
600            processing a CSA */
601
602         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
603                 return;
604
605         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
606         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
607                 return;
608
609         sdata->local->csa_channel = new_ch;
610
611         if (sw_elem->count <= 1) {
612                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
613         } else {
614                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
615                                         IEEE80211_QUEUE_STOP_REASON_CSA);
616                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
617                 mod_timer(&ifmgd->chswitch_timer,
618                           jiffies +
619                           msecs_to_jiffies(sw_elem->count *
620                                            bss->cbss.beacon_interval));
621         }
622 }
623
624 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
625                                         u16 capab_info, u8 *pwr_constr_elem,
626                                         u8 pwr_constr_elem_len)
627 {
628         struct ieee80211_conf *conf = &sdata->local->hw.conf;
629
630         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
631                 return;
632
633         /* Power constraint IE length should be 1 octet */
634         if (pwr_constr_elem_len != 1)
635                 return;
636
637         if ((*pwr_constr_elem <= conf->channel->max_power) &&
638             (*pwr_constr_elem != sdata->local->power_constr_level)) {
639                 sdata->local->power_constr_level = *pwr_constr_elem;
640                 ieee80211_hw_config(sdata->local, 0);
641         }
642 }
643
644 /* powersave */
645 static void ieee80211_enable_ps(struct ieee80211_local *local,
646                                 struct ieee80211_sub_if_data *sdata)
647 {
648         struct ieee80211_conf *conf = &local->hw.conf;
649
650         /*
651          * If we are scanning right now then the parameters will
652          * take effect when scan finishes.
653          */
654         if (local->scanning)
655                 return;
656
657         if (conf->dynamic_ps_timeout > 0 &&
658             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
659                 mod_timer(&local->dynamic_ps_timer, jiffies +
660                           msecs_to_jiffies(conf->dynamic_ps_timeout));
661         } else {
662                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
663                         ieee80211_send_nullfunc(local, sdata, 1);
664                 conf->flags |= IEEE80211_CONF_PS;
665                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
666         }
667 }
668
669 static void ieee80211_change_ps(struct ieee80211_local *local)
670 {
671         struct ieee80211_conf *conf = &local->hw.conf;
672
673         if (local->ps_sdata) {
674                 ieee80211_enable_ps(local, local->ps_sdata);
675         } else if (conf->flags & IEEE80211_CONF_PS) {
676                 conf->flags &= ~IEEE80211_CONF_PS;
677                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
678                 del_timer_sync(&local->dynamic_ps_timer);
679                 cancel_work_sync(&local->dynamic_ps_enable_work);
680         }
681 }
682
683 /* need to hold RTNL or interface lock */
684 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
685 {
686         struct ieee80211_sub_if_data *sdata, *found = NULL;
687         int count = 0;
688
689         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
690                 local->ps_sdata = NULL;
691                 return;
692         }
693
694         list_for_each_entry(sdata, &local->interfaces, list) {
695                 if (!netif_running(sdata->dev))
696                         continue;
697                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
698                         continue;
699                 found = sdata;
700                 count++;
701         }
702
703         if (count == 1 && found->u.mgd.powersave &&
704             found->u.mgd.associated && list_empty(&found->u.mgd.work_list) &&
705             !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
706                                     IEEE80211_STA_CONNECTION_POLL))) {
707                 s32 beaconint_us;
708
709                 if (latency < 0)
710                         latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
711
712                 beaconint_us = ieee80211_tu_to_usec(
713                                         found->vif.bss_conf.beacon_int);
714
715                 if (beaconint_us > latency) {
716                         local->ps_sdata = NULL;
717                 } else {
718                         u8 dtimper = found->vif.bss_conf.dtim_period;
719                         int maxslp = 1;
720
721                         if (dtimper > 1)
722                                 maxslp = min_t(int, dtimper,
723                                                     latency / beaconint_us);
724
725                         local->hw.conf.max_sleep_period = maxslp;
726                         local->ps_sdata = found;
727                 }
728         } else {
729                 local->ps_sdata = NULL;
730         }
731
732         ieee80211_change_ps(local);
733 }
734
735 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
736 {
737         struct ieee80211_local *local =
738                 container_of(work, struct ieee80211_local,
739                              dynamic_ps_disable_work);
740
741         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
742                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
743                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
744         }
745
746         ieee80211_wake_queues_by_reason(&local->hw,
747                                         IEEE80211_QUEUE_STOP_REASON_PS);
748 }
749
750 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
751 {
752         struct ieee80211_local *local =
753                 container_of(work, struct ieee80211_local,
754                              dynamic_ps_enable_work);
755         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
756
757         /* can only happen when PS was just disabled anyway */
758         if (!sdata)
759                 return;
760
761         if (local->hw.conf.flags & IEEE80211_CONF_PS)
762                 return;
763
764         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
765                 ieee80211_send_nullfunc(local, sdata, 1);
766
767         local->hw.conf.flags |= IEEE80211_CONF_PS;
768         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
769 }
770
771 void ieee80211_dynamic_ps_timer(unsigned long data)
772 {
773         struct ieee80211_local *local = (void *) data;
774
775         if (local->quiescing || local->suspended)
776                 return;
777
778         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
779 }
780
781 /* MLME */
782 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
783                                      struct ieee80211_if_managed *ifmgd,
784                                      u8 *wmm_param, size_t wmm_param_len)
785 {
786         struct ieee80211_tx_queue_params params;
787         size_t left;
788         int count;
789         u8 *pos;
790
791         if (!(ifmgd->flags & IEEE80211_STA_WMM_ENABLED))
792                 return;
793
794         if (!wmm_param)
795                 return;
796
797         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
798                 return;
799         count = wmm_param[6] & 0x0f;
800         if (count == ifmgd->wmm_last_param_set)
801                 return;
802         ifmgd->wmm_last_param_set = count;
803
804         pos = wmm_param + 8;
805         left = wmm_param_len - 8;
806
807         memset(&params, 0, sizeof(params));
808
809         local->wmm_acm = 0;
810         for (; left >= 4; left -= 4, pos += 4) {
811                 int aci = (pos[0] >> 5) & 0x03;
812                 int acm = (pos[0] >> 4) & 0x01;
813                 int queue;
814
815                 switch (aci) {
816                 case 1: /* AC_BK */
817                         queue = 3;
818                         if (acm)
819                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
820                         break;
821                 case 2: /* AC_VI */
822                         queue = 1;
823                         if (acm)
824                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
825                         break;
826                 case 3: /* AC_VO */
827                         queue = 0;
828                         if (acm)
829                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
830                         break;
831                 case 0: /* AC_BE */
832                 default:
833                         queue = 2;
834                         if (acm)
835                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
836                         break;
837                 }
838
839                 params.aifs = pos[0] & 0x0f;
840                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
841                 params.cw_min = ecw2cw(pos[1] & 0x0f);
842                 params.txop = get_unaligned_le16(pos + 2);
843 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
844                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
845                        "cWmin=%d cWmax=%d txop=%d\n",
846                        wiphy_name(local->hw.wiphy), queue, aci, acm,
847                        params.aifs, params.cw_min, params.cw_max, params.txop);
848 #endif
849                 if (drv_conf_tx(local, queue, &params) && local->ops->conf_tx)
850                         printk(KERN_DEBUG "%s: failed to set TX queue "
851                                "parameters for queue %d\n",
852                                wiphy_name(local->hw.wiphy), queue);
853         }
854 }
855
856 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
857                                            u16 capab, bool erp_valid, u8 erp)
858 {
859         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
860         u32 changed = 0;
861         bool use_protection;
862         bool use_short_preamble;
863         bool use_short_slot;
864
865         if (erp_valid) {
866                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
867                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
868         } else {
869                 use_protection = false;
870                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
871         }
872
873         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
874
875         if (use_protection != bss_conf->use_cts_prot) {
876                 bss_conf->use_cts_prot = use_protection;
877                 changed |= BSS_CHANGED_ERP_CTS_PROT;
878         }
879
880         if (use_short_preamble != bss_conf->use_short_preamble) {
881                 bss_conf->use_short_preamble = use_short_preamble;
882                 changed |= BSS_CHANGED_ERP_PREAMBLE;
883         }
884
885         if (use_short_slot != bss_conf->use_short_slot) {
886                 bss_conf->use_short_slot = use_short_slot;
887                 changed |= BSS_CHANGED_ERP_SLOT;
888         }
889
890         return changed;
891 }
892
893 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
894                                      struct ieee80211_mgd_work *wk,
895                                      u32 bss_info_changed)
896 {
897         struct ieee80211_local *local = sdata->local;
898         struct ieee80211_bss *bss = wk->bss;
899
900         bss_info_changed |= BSS_CHANGED_ASSOC;
901         /* set timing information */
902         sdata->vif.bss_conf.beacon_int = bss->cbss.beacon_interval;
903         sdata->vif.bss_conf.timestamp = bss->cbss.tsf;
904         sdata->vif.bss_conf.dtim_period = bss->dtim_period;
905
906         bss_info_changed |= BSS_CHANGED_BEACON_INT;
907         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
908                 bss->cbss.capability, bss->has_erp_value, bss->erp_value);
909
910         sdata->u.mgd.associated = bss;
911         sdata->u.mgd.old_associate_work = wk;
912         memcpy(sdata->u.mgd.bssid, bss->cbss.bssid, ETH_ALEN);
913
914         /* just to be sure */
915         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
916                                 IEEE80211_STA_BEACON_POLL);
917
918         /*
919          * Always handle WMM once after association regardless
920          * of the first value the AP uses. Setting -1 here has
921          * that effect because the AP values is an unsigned
922          * 4-bit value.
923          */
924         sdata->u.mgd.wmm_last_param_set = -1;
925
926         ieee80211_led_assoc(local, 1);
927
928         sdata->vif.bss_conf.assoc = 1;
929         /*
930          * For now just always ask the driver to update the basic rateset
931          * when we have associated, we aren't checking whether it actually
932          * changed or not.
933          */
934         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
935
936         /* And the BSSID changed - we're associated now */
937         bss_info_changed |= BSS_CHANGED_BSSID;
938
939         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
940
941         mutex_lock(&local->iflist_mtx);
942         ieee80211_recalc_ps(local, -1);
943         mutex_unlock(&local->iflist_mtx);
944
945         netif_tx_start_all_queues(sdata->dev);
946         netif_carrier_on(sdata->dev);
947 }
948
949 static enum rx_mgmt_action __must_check
950 ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
951                        struct ieee80211_mgd_work *wk)
952 {
953         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
954         struct ieee80211_local *local = sdata->local;
955
956         wk->tries++;
957         if (wk->tries > IEEE80211_AUTH_MAX_TRIES) {
958                 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
959                        sdata->dev->name, wk->bss->cbss.bssid);
960
961                 /*
962                  * Most likely AP is not in the range so remove the
963                  * bss struct for that AP.
964                  */
965                 cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
966
967                 /*
968                  * We might have a pending scan which had no chance to run yet
969                  * due to work needing to be done. Hence, queue the STAs work
970                  * again for that.
971                  */
972                 ieee80211_queue_work(&local->hw, &ifmgd->work);
973                 return RX_MGMT_CFG80211_AUTH_TO;
974         }
975
976         printk(KERN_DEBUG "%s: direct probe to AP %pM (try %d)\n",
977                         sdata->dev->name, wk->bss->cbss.bssid,
978                         wk->tries);
979
980         /*
981          * Direct probe is sent to broadcast address as some APs
982          * will not answer to direct packet in unassociated state.
983          */
984         ieee80211_send_probe_req(sdata, NULL, wk->ssid, wk->ssid_len, NULL, 0);
985
986         wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
987         run_again(ifmgd, wk->timeout);
988
989         return RX_MGMT_NONE;
990 }
991
992
993 static enum rx_mgmt_action __must_check
994 ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
995                        struct ieee80211_mgd_work *wk)
996 {
997         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
998         struct ieee80211_local *local = sdata->local;
999
1000         wk->tries++;
1001         if (wk->tries > IEEE80211_AUTH_MAX_TRIES) {
1002                 printk(KERN_DEBUG "%s: authentication with AP %pM"
1003                        " timed out\n",
1004                        sdata->dev->name, wk->bss->cbss.bssid);
1005
1006                 /*
1007                  * Most likely AP is not in the range so remove the
1008                  * bss struct for that AP.
1009                  */
1010                 cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
1011
1012                 /*
1013                  * We might have a pending scan which had no chance to run yet
1014                  * due to work needing to be done. Hence, queue the STAs work
1015                  * again for that.
1016                  */
1017                 ieee80211_queue_work(&local->hw, &ifmgd->work);
1018                 return RX_MGMT_CFG80211_AUTH_TO;
1019         }
1020
1021         printk(KERN_DEBUG "%s: authenticate with AP %pM (try %d)\n",
1022                sdata->dev->name, wk->bss->cbss.bssid, wk->tries);
1023
1024         ieee80211_send_auth(sdata, 1, wk->auth_alg, wk->ie, wk->ie_len,
1025                             wk->bss->cbss.bssid, NULL, 0, 0);
1026         wk->auth_transaction = 2;
1027
1028         wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
1029         run_again(ifmgd, wk->timeout);
1030
1031         return RX_MGMT_NONE;
1032 }
1033
1034 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1035                                    bool deauth)
1036 {
1037         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1038         struct ieee80211_local *local = sdata->local;
1039         struct sta_info *sta;
1040         u32 changed = 0, config_changed = 0;
1041         u8 bssid[ETH_ALEN];
1042
1043         ASSERT_MGD_MTX(ifmgd);
1044
1045         if (WARN_ON(!ifmgd->associated))
1046                 return;
1047
1048         memcpy(bssid, ifmgd->associated->cbss.bssid, ETH_ALEN);
1049
1050         ifmgd->associated = NULL;
1051         memset(ifmgd->bssid, 0, ETH_ALEN);
1052
1053         if (deauth) {
1054                 kfree(ifmgd->old_associate_work);
1055                 ifmgd->old_associate_work = NULL;
1056         } else {
1057                 struct ieee80211_mgd_work *wk = ifmgd->old_associate_work;
1058
1059                 wk->state = IEEE80211_MGD_STATE_IDLE;
1060                 list_add(&wk->list, &ifmgd->work_list);
1061         }
1062
1063         /*
1064          * we need to commit the associated = NULL change because the
1065          * scan code uses that to determine whether this iface should
1066          * go to/wake up from powersave or not -- and could otherwise
1067          * wake the queues erroneously.
1068          */
1069         smp_mb();
1070
1071         /*
1072          * Thus, we can only afterwards stop the queues -- to account
1073          * for the case where another CPU is finishing a scan at this
1074          * time -- we don't want the scan code to enable queues.
1075          */
1076
1077         netif_tx_stop_all_queues(sdata->dev);
1078         netif_carrier_off(sdata->dev);
1079
1080         rcu_read_lock();
1081         sta = sta_info_get(local, bssid);
1082         if (sta)
1083                 ieee80211_sta_tear_down_BA_sessions(sta);
1084         rcu_read_unlock();
1085
1086         changed |= ieee80211_reset_erp_info(sdata);
1087
1088         ieee80211_led_assoc(local, 0);
1089         changed |= BSS_CHANGED_ASSOC;
1090         sdata->vif.bss_conf.assoc = false;
1091
1092         ieee80211_set_wmm_default(sdata);
1093
1094         /* channel(_type) changes are handled by ieee80211_hw_config */
1095         local->oper_channel_type = NL80211_CHAN_NO_HT;
1096
1097         /* on the next assoc, re-program HT parameters */
1098         sdata->ht_opmode_valid = false;
1099
1100         local->power_constr_level = 0;
1101
1102         del_timer_sync(&local->dynamic_ps_timer);
1103         cancel_work_sync(&local->dynamic_ps_enable_work);
1104
1105         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1106                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1107                 config_changed |= IEEE80211_CONF_CHANGE_PS;
1108         }
1109
1110         ieee80211_hw_config(local, config_changed);
1111
1112         /* And the BSSID changed -- not very interesting here */
1113         changed |= BSS_CHANGED_BSSID;
1114         ieee80211_bss_info_change_notify(sdata, changed);
1115
1116         rcu_read_lock();
1117
1118         sta = sta_info_get(local, bssid);
1119         if (!sta) {
1120                 rcu_read_unlock();
1121                 return;
1122         }
1123
1124         sta_info_unlink(&sta);
1125
1126         rcu_read_unlock();
1127
1128         sta_info_destroy(sta);
1129 }
1130
1131 static enum rx_mgmt_action __must_check
1132 ieee80211_associate(struct ieee80211_sub_if_data *sdata,
1133                     struct ieee80211_mgd_work *wk)
1134 {
1135         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1136         struct ieee80211_local *local = sdata->local;
1137
1138         wk->tries++;
1139         if (wk->tries > IEEE80211_ASSOC_MAX_TRIES) {
1140                 printk(KERN_DEBUG "%s: association with AP %pM"
1141                        " timed out\n",
1142                        sdata->dev->name, wk->bss->cbss.bssid);
1143
1144                 /*
1145                  * Most likely AP is not in the range so remove the
1146                  * bss struct for that AP.
1147                  */
1148                 cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
1149
1150                 /*
1151                  * We might have a pending scan which had no chance to run yet
1152                  * due to work needing to be done. Hence, queue the STAs work
1153                  * again for that.
1154                  */
1155                 ieee80211_queue_work(&local->hw, &ifmgd->work);
1156                 return RX_MGMT_CFG80211_ASSOC_TO;
1157         }
1158
1159         printk(KERN_DEBUG "%s: associate with AP %pM (try %d)\n",
1160                sdata->dev->name, wk->bss->cbss.bssid, wk->tries);
1161         ieee80211_send_assoc(sdata, wk);
1162
1163         wk->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
1164         run_again(ifmgd, wk->timeout);
1165
1166         return RX_MGMT_NONE;
1167 }
1168
1169 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1170                              struct ieee80211_hdr *hdr)
1171 {
1172         /*
1173          * We can postpone the mgd.timer whenever receiving unicast frames
1174          * from AP because we know that the connection is working both ways
1175          * at that time. But multicast frames (and hence also beacons) must
1176          * be ignored here, because we need to trigger the timer during
1177          * data idle periods for sending the periodic probe request to the
1178          * AP we're connected to.
1179          */
1180         if (is_multicast_ether_addr(hdr->addr1))
1181                 return;
1182
1183         mod_timer(&sdata->u.mgd.conn_mon_timer,
1184                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
1185 }
1186
1187 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1188 {
1189         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1190         const u8 *ssid;
1191
1192         ssid = ieee80211_bss_get_ie(&ifmgd->associated->cbss, WLAN_EID_SSID);
1193         ieee80211_send_probe_req(sdata, ifmgd->associated->cbss.bssid,
1194                                  ssid + 2, ssid[1], NULL, 0);
1195
1196         ifmgd->probe_send_count++;
1197         ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
1198         run_again(ifmgd, ifmgd->probe_timeout);
1199 }
1200
1201 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1202                                    bool beacon)
1203 {
1204         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1205         bool already = false;
1206
1207         if (!netif_running(sdata->dev))
1208                 return;
1209
1210         if (sdata->local->scanning)
1211                 return;
1212
1213         mutex_lock(&ifmgd->mtx);
1214
1215         if (!ifmgd->associated)
1216                 goto out;
1217
1218 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1219         if (beacon && net_ratelimit())
1220                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1221                        "- sending probe request\n", sdata->dev->name);
1222 #endif
1223
1224         /*
1225          * The driver/our work has already reported this event or the
1226          * connection monitoring has kicked in and we have already sent
1227          * a probe request. Or maybe the AP died and the driver keeps
1228          * reporting until we disassociate...
1229          *
1230          * In either case we have to ignore the current call to this
1231          * function (except for setting the correct probe reason bit)
1232          * because otherwise we would reset the timer every time and
1233          * never check whether we received a probe response!
1234          */
1235         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1236                             IEEE80211_STA_CONNECTION_POLL))
1237                 already = true;
1238
1239         if (beacon)
1240                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1241         else
1242                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1243
1244         if (already)
1245                 goto out;
1246
1247         mutex_lock(&sdata->local->iflist_mtx);
1248         ieee80211_recalc_ps(sdata->local, -1);
1249         mutex_unlock(&sdata->local->iflist_mtx);
1250
1251         ifmgd->probe_send_count = 0;
1252         ieee80211_mgd_probe_ap_send(sdata);
1253  out:
1254         mutex_unlock(&ifmgd->mtx);
1255 }
1256
1257 void ieee80211_beacon_loss_work(struct work_struct *work)
1258 {
1259         struct ieee80211_sub_if_data *sdata =
1260                 container_of(work, struct ieee80211_sub_if_data,
1261                              u.mgd.beacon_loss_work);
1262
1263         ieee80211_mgd_probe_ap(sdata, true);
1264 }
1265
1266 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1267 {
1268         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1269
1270         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
1271 }
1272 EXPORT_SYMBOL(ieee80211_beacon_loss);
1273
1274 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1275                                      struct ieee80211_mgd_work *wk)
1276 {
1277         wk->state = IEEE80211_MGD_STATE_IDLE;
1278         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1279 }
1280
1281
1282 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1283                                      struct ieee80211_mgd_work *wk,
1284                                      struct ieee80211_mgmt *mgmt,
1285                                      size_t len)
1286 {
1287         u8 *pos;
1288         struct ieee802_11_elems elems;
1289
1290         pos = mgmt->u.auth.variable;
1291         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1292         if (!elems.challenge)
1293                 return;
1294         ieee80211_send_auth(sdata, 3, wk->auth_alg,
1295                             elems.challenge - 2, elems.challenge_len + 2,
1296                             wk->bss->cbss.bssid,
1297                             wk->key, wk->key_len, wk->key_idx);
1298         wk->auth_transaction = 4;
1299 }
1300
1301 static enum rx_mgmt_action __must_check
1302 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1303                        struct ieee80211_mgd_work *wk,
1304                        struct ieee80211_mgmt *mgmt, size_t len)
1305 {
1306         u16 auth_alg, auth_transaction, status_code;
1307
1308         if (wk->state != IEEE80211_MGD_STATE_AUTH)
1309                 return RX_MGMT_NONE;
1310
1311         if (len < 24 + 6)
1312                 return RX_MGMT_NONE;
1313
1314         if (memcmp(wk->bss->cbss.bssid, mgmt->sa, ETH_ALEN) != 0)
1315                 return RX_MGMT_NONE;
1316
1317         if (memcmp(wk->bss->cbss.bssid, mgmt->bssid, ETH_ALEN) != 0)
1318                 return RX_MGMT_NONE;
1319
1320         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1321         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1322         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1323
1324         if (auth_alg != wk->auth_alg ||
1325             auth_transaction != wk->auth_transaction)
1326                 return RX_MGMT_NONE;
1327
1328         if (status_code != WLAN_STATUS_SUCCESS) {
1329                 list_del(&wk->list);
1330                 kfree(wk);
1331                 return RX_MGMT_CFG80211_AUTH;
1332         }
1333
1334         switch (wk->auth_alg) {
1335         case WLAN_AUTH_OPEN:
1336         case WLAN_AUTH_LEAP:
1337         case WLAN_AUTH_FT:
1338                 ieee80211_auth_completed(sdata, wk);
1339                 return RX_MGMT_CFG80211_AUTH;
1340         case WLAN_AUTH_SHARED_KEY:
1341                 if (wk->auth_transaction == 4) {
1342                         ieee80211_auth_completed(sdata, wk);
1343                         return RX_MGMT_CFG80211_AUTH;
1344                 } else
1345                         ieee80211_auth_challenge(sdata, wk, mgmt, len);
1346                 break;
1347         }
1348
1349         return RX_MGMT_NONE;
1350 }
1351
1352
1353 static enum rx_mgmt_action __must_check
1354 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1355                          struct ieee80211_mgd_work *wk,
1356                          struct ieee80211_mgmt *mgmt, size_t len)
1357 {
1358         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1359         const u8 *bssid = NULL;
1360         u16 reason_code;
1361
1362         if (len < 24 + 2)
1363                 return RX_MGMT_NONE;
1364
1365         ASSERT_MGD_MTX(ifmgd);
1366
1367         if (wk)
1368                 bssid = wk->bss->cbss.bssid;
1369         else
1370                 bssid = ifmgd->associated->cbss.bssid;
1371
1372         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1373
1374         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1375                         sdata->dev->name, bssid, reason_code);
1376
1377         if (!wk) {
1378                 ieee80211_set_disassoc(sdata, true);
1379                 ieee80211_recalc_idle(sdata->local);
1380         } else {
1381                 list_del(&wk->list);
1382                 kfree(wk);
1383         }
1384
1385         return RX_MGMT_CFG80211_DEAUTH;
1386 }
1387
1388
1389 static enum rx_mgmt_action __must_check
1390 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1391                            struct ieee80211_mgmt *mgmt, size_t len)
1392 {
1393         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1394         u16 reason_code;
1395
1396         if (len < 24 + 2)
1397                 return RX_MGMT_NONE;
1398
1399         ASSERT_MGD_MTX(ifmgd);
1400
1401         if (WARN_ON(!ifmgd->associated))
1402                 return RX_MGMT_NONE;
1403
1404         if (WARN_ON(memcmp(ifmgd->associated->cbss.bssid, mgmt->sa, ETH_ALEN)))
1405                 return RX_MGMT_NONE;
1406
1407         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1408
1409         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1410                         sdata->dev->name, mgmt->sa, reason_code);
1411
1412         ieee80211_set_disassoc(sdata, false);
1413         ieee80211_recalc_idle(sdata->local);
1414         return RX_MGMT_CFG80211_DISASSOC;
1415 }
1416
1417
1418 static enum rx_mgmt_action __must_check
1419 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1420                              struct ieee80211_mgd_work *wk,
1421                              struct ieee80211_mgmt *mgmt, size_t len,
1422                              bool reassoc)
1423 {
1424         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1425         struct ieee80211_local *local = sdata->local;
1426         struct ieee80211_supported_band *sband;
1427         struct sta_info *sta;
1428         u32 rates, basic_rates;
1429         u16 capab_info, status_code, aid;
1430         struct ieee802_11_elems elems;
1431         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1432         u8 *pos;
1433         u32 changed = 0;
1434         int i, j;
1435         bool have_higher_than_11mbit = false, newsta = false;
1436         u16 ap_ht_cap_flags;
1437
1438         /*
1439          * AssocResp and ReassocResp have identical structure, so process both
1440          * of them in this function.
1441          */
1442
1443         if (len < 24 + 6)
1444                 return RX_MGMT_NONE;
1445
1446         if (memcmp(wk->bss->cbss.bssid, mgmt->sa, ETH_ALEN) != 0)
1447                 return RX_MGMT_NONE;
1448
1449         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1450         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1451         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1452
1453         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1454                "status=%d aid=%d)\n",
1455                sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1456                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1457
1458         pos = mgmt->u.assoc_resp.variable;
1459         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1460
1461         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1462             elems.timeout_int && elems.timeout_int_len == 5 &&
1463             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1464                 u32 tu, ms;
1465                 tu = get_unaligned_le32(elems.timeout_int + 1);
1466                 ms = tu * 1024 / 1000;
1467                 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1468                        "comeback duration %u TU (%u ms)\n",
1469                        sdata->dev->name, tu, ms);
1470                 wk->timeout = jiffies + msecs_to_jiffies(ms);
1471                 if (ms > IEEE80211_ASSOC_TIMEOUT)
1472                         run_again(ifmgd, jiffies + msecs_to_jiffies(ms));
1473                 return RX_MGMT_NONE;
1474         }
1475
1476         if (status_code != WLAN_STATUS_SUCCESS) {
1477                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1478                        sdata->dev->name, status_code);
1479                 wk->state = IEEE80211_MGD_STATE_IDLE;
1480                 return RX_MGMT_CFG80211_ASSOC;
1481         }
1482
1483         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1484                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1485                        "set\n", sdata->dev->name, aid);
1486         aid &= ~(BIT(15) | BIT(14));
1487
1488         if (!elems.supp_rates) {
1489                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1490                        sdata->dev->name);
1491                 return RX_MGMT_NONE;
1492         }
1493
1494         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1495         ifmgd->aid = aid;
1496
1497         rcu_read_lock();
1498
1499         /* Add STA entry for the AP */
1500         sta = sta_info_get(local, wk->bss->cbss.bssid);
1501         if (!sta) {
1502                 newsta = true;
1503
1504                 rcu_read_unlock();
1505
1506                 sta = sta_info_alloc(sdata, wk->bss->cbss.bssid, GFP_KERNEL);
1507                 if (!sta) {
1508                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1509                                " the AP\n", sdata->dev->name);
1510                         return RX_MGMT_NONE;
1511                 }
1512
1513                 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1514                                    WLAN_STA_ASSOC_AP);
1515                 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1516                         set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1517
1518                 rcu_read_lock();
1519         }
1520
1521         rates = 0;
1522         basic_rates = 0;
1523         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1524
1525         for (i = 0; i < elems.supp_rates_len; i++) {
1526                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1527                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1528
1529                 if (rate > 110)
1530                         have_higher_than_11mbit = true;
1531
1532                 for (j = 0; j < sband->n_bitrates; j++) {
1533                         if (sband->bitrates[j].bitrate == rate) {
1534                                 rates |= BIT(j);
1535                                 if (is_basic)
1536                                         basic_rates |= BIT(j);
1537                                 break;
1538                         }
1539                 }
1540         }
1541
1542         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1543                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1544                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1545
1546                 if (rate > 110)
1547                         have_higher_than_11mbit = true;
1548
1549                 for (j = 0; j < sband->n_bitrates; j++) {
1550                         if (sband->bitrates[j].bitrate == rate) {
1551                                 rates |= BIT(j);
1552                                 if (is_basic)
1553                                         basic_rates |= BIT(j);
1554                                 break;
1555                         }
1556                 }
1557         }
1558
1559         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1560         sdata->vif.bss_conf.basic_rates = basic_rates;
1561
1562         /* cf. IEEE 802.11 9.2.12 */
1563         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1564             have_higher_than_11mbit)
1565                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1566         else
1567                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1568
1569         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1570                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1571                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1572
1573         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1574
1575         rate_control_rate_init(sta);
1576
1577         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1578                 set_sta_flags(sta, WLAN_STA_MFP);
1579
1580         if (elems.wmm_param)
1581                 set_sta_flags(sta, WLAN_STA_WME);
1582
1583         if (newsta) {
1584                 int err = sta_info_insert(sta);
1585                 if (err) {
1586                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1587                                " the AP (error %d)\n", sdata->dev->name, err);
1588                         rcu_read_unlock();
1589                         return RX_MGMT_NONE;
1590                 }
1591         }
1592
1593         rcu_read_unlock();
1594
1595         if (elems.wmm_param)
1596                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1597                                          elems.wmm_param_len);
1598         else
1599                 ieee80211_set_wmm_default(sdata);
1600
1601         if (elems.ht_info_elem && elems.wmm_param &&
1602             (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
1603             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1604                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1605                                                wk->bss->cbss.bssid,
1606                                                ap_ht_cap_flags);
1607
1608         /* delete work item -- must be before set_associated for PS */
1609         list_del(&wk->list);
1610
1611         /* set AID and assoc capability,
1612          * ieee80211_set_associated() will tell the driver */
1613         bss_conf->aid = aid;
1614         bss_conf->assoc_capability = capab_info;
1615         /* this will take ownership of wk */
1616         ieee80211_set_associated(sdata, wk, changed);
1617
1618         /*
1619          * Start timer to probe the connection to the AP now.
1620          * Also start the timer that will detect beacon loss.
1621          */
1622         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1623         mod_beacon_timer(sdata);
1624
1625         return RX_MGMT_CFG80211_ASSOC;
1626 }
1627
1628
1629 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1630                                   struct ieee80211_mgmt *mgmt,
1631                                   size_t len,
1632                                   struct ieee80211_rx_status *rx_status,
1633                                   struct ieee802_11_elems *elems,
1634                                   bool beacon)
1635 {
1636         struct ieee80211_local *local = sdata->local;
1637         int freq;
1638         struct ieee80211_bss *bss;
1639         struct ieee80211_channel *channel;
1640
1641         if (elems->ds_params && elems->ds_params_len == 1)
1642                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1643         else
1644                 freq = rx_status->freq;
1645
1646         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1647
1648         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1649                 return;
1650
1651         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1652                                         channel, beacon);
1653         if (bss)
1654                 ieee80211_rx_bss_put(local, bss);
1655
1656         if (!sdata->u.mgd.associated)
1657                 return;
1658
1659         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1660             (memcmp(mgmt->bssid, sdata->u.mgd.associated->cbss.bssid,
1661                                                         ETH_ALEN) == 0)) {
1662                 struct ieee80211_channel_sw_ie *sw_elem =
1663                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1664                 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1665         }
1666 }
1667
1668
1669 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1670                                          struct ieee80211_mgd_work *wk,
1671                                          struct ieee80211_mgmt *mgmt, size_t len,
1672                                          struct ieee80211_rx_status *rx_status)
1673 {
1674         struct ieee80211_if_managed *ifmgd;
1675         size_t baselen;
1676         struct ieee802_11_elems elems;
1677
1678         ifmgd = &sdata->u.mgd;
1679
1680         ASSERT_MGD_MTX(ifmgd);
1681
1682         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1683                 return; /* ignore ProbeResp to foreign address */
1684
1685         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1686         if (baselen > len)
1687                 return;
1688
1689         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1690                                 &elems);
1691
1692         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1693
1694         /* direct probe may be part of the association flow */
1695         if (wk && wk->state == IEEE80211_MGD_STATE_PROBE) {
1696                 printk(KERN_DEBUG "%s: direct probe responded\n",
1697                        sdata->dev->name);
1698                 wk->tries = 0;
1699                 wk->state = IEEE80211_MGD_STATE_AUTH;
1700                 WARN_ON(ieee80211_authenticate(sdata, wk) != RX_MGMT_NONE);
1701         }
1702
1703         if (ifmgd->associated &&
1704             memcmp(mgmt->bssid, ifmgd->associated->cbss.bssid, ETH_ALEN) == 0 &&
1705             ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1706                             IEEE80211_STA_CONNECTION_POLL)) {
1707                 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1708                                   IEEE80211_STA_BEACON_POLL);
1709                 mutex_lock(&sdata->local->iflist_mtx);
1710                 ieee80211_recalc_ps(sdata->local, -1);
1711                 mutex_unlock(&sdata->local->iflist_mtx);
1712                 /*
1713                  * We've received a probe response, but are not sure whether
1714                  * we have or will be receiving any beacons or data, so let's
1715                  * schedule the timers again, just in case.
1716                  */
1717                 mod_beacon_timer(sdata);
1718                 mod_timer(&ifmgd->conn_mon_timer,
1719                           round_jiffies_up(jiffies +
1720                                            IEEE80211_CONNECTION_IDLE_TIME));
1721         }
1722 }
1723
1724 /*
1725  * This is the canonical list of information elements we care about,
1726  * the filter code also gives us all changes to the Microsoft OUI
1727  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1728  *
1729  * We implement beacon filtering in software since that means we can
1730  * avoid processing the frame here and in cfg80211, and userspace
1731  * will not be able to tell whether the hardware supports it or not.
1732  *
1733  * XXX: This list needs to be dynamic -- userspace needs to be able to
1734  *      add items it requires. It also needs to be able to tell us to
1735  *      look out for other vendor IEs.
1736  */
1737 static const u64 care_about_ies =
1738         (1ULL << WLAN_EID_COUNTRY) |
1739         (1ULL << WLAN_EID_ERP_INFO) |
1740         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1741         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1742         (1ULL << WLAN_EID_HT_CAPABILITY) |
1743         (1ULL << WLAN_EID_HT_INFORMATION);
1744
1745 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1746                                      struct ieee80211_mgmt *mgmt,
1747                                      size_t len,
1748                                      struct ieee80211_rx_status *rx_status)
1749 {
1750         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1751         size_t baselen;
1752         struct ieee802_11_elems elems;
1753         struct ieee80211_local *local = sdata->local;
1754         u32 changed = 0;
1755         bool erp_valid, directed_tim = false;
1756         u8 erp_value = 0;
1757         u32 ncrc;
1758         u8 *bssid;
1759
1760         ASSERT_MGD_MTX(ifmgd);
1761
1762         /* Process beacon from the current BSS */
1763         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1764         if (baselen > len)
1765                 return;
1766
1767         if (rx_status->freq != local->hw.conf.channel->center_freq)
1768                 return;
1769
1770         /*
1771          * We might have received a number of frames, among them a
1772          * disassoc frame and a beacon...
1773          */
1774         if (!ifmgd->associated)
1775                 return;
1776
1777         bssid = ifmgd->associated->cbss.bssid;
1778
1779         /*
1780          * And in theory even frames from a different AP we were just
1781          * associated to a split-second ago!
1782          */
1783         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1784                 return;
1785
1786         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1787 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1788                 if (net_ratelimit()) {
1789                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1790                                "to a received beacon\n", sdata->dev->name);
1791                 }
1792 #endif
1793                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1794                 mutex_lock(&local->iflist_mtx);
1795                 ieee80211_recalc_ps(local, -1);
1796                 mutex_unlock(&local->iflist_mtx);
1797         }
1798
1799         /*
1800          * Push the beacon loss detection into the future since
1801          * we are processing a beacon from the AP just now.
1802          */
1803         mod_beacon_timer(sdata);
1804
1805         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1806         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1807                                           len - baselen, &elems,
1808                                           care_about_ies, ncrc);
1809
1810         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1811                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1812                                                    ifmgd->aid);
1813
1814         if (ncrc != ifmgd->beacon_crc) {
1815                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1816                                       true);
1817
1818                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1819                                          elems.wmm_param_len);
1820         }
1821
1822         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1823                 if (directed_tim) {
1824                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1825                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1826                                 ieee80211_hw_config(local,
1827                                                     IEEE80211_CONF_CHANGE_PS);
1828                                 ieee80211_send_nullfunc(local, sdata, 0);
1829                         } else {
1830                                 local->pspolling = true;
1831
1832                                 /*
1833                                  * Here is assumed that the driver will be
1834                                  * able to send ps-poll frame and receive a
1835                                  * response even though power save mode is
1836                                  * enabled, but some drivers might require
1837                                  * to disable power save here. This needs
1838                                  * to be investigated.
1839                                  */
1840                                 ieee80211_send_pspoll(local, sdata);
1841                         }
1842                 }
1843         }
1844
1845         if (ncrc == ifmgd->beacon_crc)
1846                 return;
1847         ifmgd->beacon_crc = ncrc;
1848
1849         if (elems.erp_info && elems.erp_info_len >= 1) {
1850                 erp_valid = true;
1851                 erp_value = elems.erp_info[0];
1852         } else {
1853                 erp_valid = false;
1854         }
1855         changed |= ieee80211_handle_bss_capability(sdata,
1856                         le16_to_cpu(mgmt->u.beacon.capab_info),
1857                         erp_valid, erp_value);
1858
1859
1860         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1861             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1862                 struct sta_info *sta;
1863                 struct ieee80211_supported_band *sband;
1864                 u16 ap_ht_cap_flags;
1865
1866                 rcu_read_lock();
1867
1868                 sta = sta_info_get(local, bssid);
1869                 if (WARN_ON(!sta)) {
1870                         rcu_read_unlock();
1871                         return;
1872                 }
1873
1874                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1875
1876                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1877                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1878
1879                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1880
1881                 rcu_read_unlock();
1882
1883                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1884                                                bssid, ap_ht_cap_flags);
1885         }
1886
1887         /* Note: country IE parsing is done for us by cfg80211 */
1888         if (elems.country_elem) {
1889                 /* TODO: IBSS also needs this */
1890                 if (elems.pwr_constr_elem)
1891                         ieee80211_handle_pwr_constr(sdata,
1892                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1893                                 elems.pwr_constr_elem,
1894                                 elems.pwr_constr_elem_len);
1895         }
1896
1897         ieee80211_bss_info_change_notify(sdata, changed);
1898 }
1899
1900 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1901                                           struct sk_buff *skb)
1902 {
1903         struct ieee80211_local *local = sdata->local;
1904         struct ieee80211_mgmt *mgmt;
1905         u16 fc;
1906
1907         if (skb->len < 24)
1908                 return RX_DROP_MONITOR;
1909
1910         mgmt = (struct ieee80211_mgmt *) skb->data;
1911         fc = le16_to_cpu(mgmt->frame_control);
1912
1913         switch (fc & IEEE80211_FCTL_STYPE) {
1914         case IEEE80211_STYPE_PROBE_RESP:
1915         case IEEE80211_STYPE_BEACON:
1916         case IEEE80211_STYPE_AUTH:
1917         case IEEE80211_STYPE_ASSOC_RESP:
1918         case IEEE80211_STYPE_REASSOC_RESP:
1919         case IEEE80211_STYPE_DEAUTH:
1920         case IEEE80211_STYPE_DISASSOC:
1921         case IEEE80211_STYPE_ACTION:
1922                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1923                 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
1924                 return RX_QUEUED;
1925         }
1926
1927         return RX_DROP_MONITOR;
1928 }
1929
1930 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1931                                          struct sk_buff *skb)
1932 {
1933         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1934         struct ieee80211_rx_status *rx_status;
1935         struct ieee80211_mgmt *mgmt;
1936         struct ieee80211_mgd_work *wk;
1937         enum rx_mgmt_action rma = RX_MGMT_NONE;
1938         u16 fc;
1939
1940         rx_status = (struct ieee80211_rx_status *) skb->cb;
1941         mgmt = (struct ieee80211_mgmt *) skb->data;
1942         fc = le16_to_cpu(mgmt->frame_control);
1943
1944         mutex_lock(&ifmgd->mtx);
1945
1946         if (ifmgd->associated &&
1947             memcmp(ifmgd->associated->cbss.bssid, mgmt->bssid,
1948                                                         ETH_ALEN) == 0) {
1949                 switch (fc & IEEE80211_FCTL_STYPE) {
1950                 case IEEE80211_STYPE_BEACON:
1951                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1952                                                  rx_status);
1953                         break;
1954                 case IEEE80211_STYPE_PROBE_RESP:
1955                         ieee80211_rx_mgmt_probe_resp(sdata, NULL, mgmt,
1956                                                      skb->len, rx_status);
1957                         break;
1958                 case IEEE80211_STYPE_DEAUTH:
1959                         rma = ieee80211_rx_mgmt_deauth(sdata, NULL,
1960                                                        mgmt, skb->len);
1961                         break;
1962                 case IEEE80211_STYPE_DISASSOC:
1963                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1964                         break;
1965                 case IEEE80211_STYPE_ACTION:
1966                         if (mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
1967                                 break;
1968
1969                         ieee80211_sta_process_chanswitch(sdata,
1970                                         &mgmt->u.action.u.chan_switch.sw_elem,
1971                                         ifmgd->associated);
1972                         break;
1973                 }
1974                 mutex_unlock(&ifmgd->mtx);
1975
1976                 switch (rma) {
1977                 case RX_MGMT_NONE:
1978                         /* no action */
1979                         break;
1980                 case RX_MGMT_CFG80211_DEAUTH:
1981                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1982                         break;
1983                 case RX_MGMT_CFG80211_DISASSOC:
1984                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1985                         break;
1986                 default:
1987                         WARN(1, "unexpected: %d", rma);
1988                 }
1989                 goto out;
1990         }
1991
1992         list_for_each_entry(wk, &ifmgd->work_list, list) {
1993                 if (memcmp(wk->bss->cbss.bssid, mgmt->bssid, ETH_ALEN) != 0)
1994                         continue;
1995
1996                 switch (fc & IEEE80211_FCTL_STYPE) {
1997                 case IEEE80211_STYPE_PROBE_RESP:
1998                         ieee80211_rx_mgmt_probe_resp(sdata, wk, mgmt, skb->len,
1999                                                      rx_status);
2000                         break;
2001                 case IEEE80211_STYPE_AUTH:
2002                         rma = ieee80211_rx_mgmt_auth(sdata, wk, mgmt, skb->len);
2003                         break;
2004                 case IEEE80211_STYPE_ASSOC_RESP:
2005                         rma = ieee80211_rx_mgmt_assoc_resp(sdata, wk, mgmt,
2006                                                            skb->len, false);
2007                         break;
2008                 case IEEE80211_STYPE_REASSOC_RESP:
2009                         rma = ieee80211_rx_mgmt_assoc_resp(sdata, wk, mgmt,
2010                                                            skb->len, true);
2011                         break;
2012                 case IEEE80211_STYPE_DEAUTH:
2013                         rma = ieee80211_rx_mgmt_deauth(sdata, wk, mgmt,
2014                                                        skb->len);
2015                         break;
2016                 }
2017                 /*
2018                  * We've processed this frame for that work, so it can't
2019                  * belong to another work struct.
2020                  * NB: this is also required for correctness because the
2021                  * called functions can free 'wk', and for 'rma'!
2022                  */
2023                 break;
2024         }
2025
2026         mutex_unlock(&ifmgd->mtx);
2027
2028         switch (rma) {
2029         case RX_MGMT_NONE:
2030                 /* no action */
2031                 break;
2032         case RX_MGMT_CFG80211_AUTH:
2033                 cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, skb->len);
2034                 break;
2035         case RX_MGMT_CFG80211_ASSOC:
2036                 cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, skb->len);
2037                 break;
2038         case RX_MGMT_CFG80211_DEAUTH:
2039                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2040                 break;
2041         default:
2042                 WARN(1, "unexpected: %d", rma);
2043         }
2044
2045  out:
2046         kfree_skb(skb);
2047 }
2048
2049 static void ieee80211_sta_timer(unsigned long data)
2050 {
2051         struct ieee80211_sub_if_data *sdata =
2052                 (struct ieee80211_sub_if_data *) data;
2053         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2054         struct ieee80211_local *local = sdata->local;
2055
2056         if (local->quiescing) {
2057                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2058                 return;
2059         }
2060
2061         ieee80211_queue_work(&local->hw, &ifmgd->work);
2062 }
2063
2064 static void ieee80211_sta_work(struct work_struct *work)
2065 {
2066         struct ieee80211_sub_if_data *sdata =
2067                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
2068         struct ieee80211_local *local = sdata->local;
2069         struct ieee80211_if_managed *ifmgd;
2070         struct sk_buff *skb;
2071         struct ieee80211_mgd_work *wk, *tmp;
2072         LIST_HEAD(free_work);
2073         enum rx_mgmt_action rma;
2074         bool anybusy = false;
2075
2076         if (!netif_running(sdata->dev))
2077                 return;
2078
2079         if (local->scanning)
2080                 return;
2081
2082         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2083                 return;
2084
2085         /*
2086          * ieee80211_queue_work() should have picked up most cases,
2087          * here we'll pick the the rest.
2088          */
2089         if (WARN(local->suspended, "STA MLME work scheduled while "
2090                  "going to suspend\n"))
2091                 return;
2092
2093         ifmgd = &sdata->u.mgd;
2094
2095         /* first process frames to avoid timing out while a frame is pending */
2096         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
2097                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2098
2099         /* then process the rest of the work */
2100         mutex_lock(&ifmgd->mtx);
2101
2102         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2103                             IEEE80211_STA_CONNECTION_POLL) &&
2104             ifmgd->associated) {
2105                 u8 bssid[ETH_ALEN];
2106
2107                 memcpy(bssid, ifmgd->associated->cbss.bssid, ETH_ALEN);
2108                 if (time_is_after_jiffies(ifmgd->probe_timeout))
2109                         run_again(ifmgd, ifmgd->probe_timeout);
2110
2111                 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
2112 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2113                         printk(KERN_DEBUG "No probe response from AP %pM"
2114                                 " after %dms, try %d\n", bssid,
2115                                 (1000 * IEEE80211_PROBE_WAIT)/HZ,
2116                                 ifmgd->probe_send_count);
2117 #endif
2118                         ieee80211_mgd_probe_ap_send(sdata);
2119                 } else {
2120                         /*
2121                          * We actually lost the connection ... or did we?
2122                          * Let's make sure!
2123                          */
2124                         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
2125                                           IEEE80211_STA_BEACON_POLL);
2126                         printk(KERN_DEBUG "No probe response from AP %pM"
2127                                 " after %dms, disconnecting.\n",
2128                                 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
2129                         ieee80211_set_disassoc(sdata, true);
2130                         ieee80211_recalc_idle(local);
2131                         mutex_unlock(&ifmgd->mtx);
2132                         /*
2133                          * must be outside lock due to cfg80211,
2134                          * but that's not a problem.
2135                          */
2136                         ieee80211_send_deauth_disassoc(sdata, bssid,
2137                                         IEEE80211_STYPE_DEAUTH,
2138                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2139                                         NULL);
2140                         mutex_lock(&ifmgd->mtx);
2141                 }
2142         }
2143
2144
2145         ieee80211_recalc_idle(local);
2146
2147         list_for_each_entry_safe(wk, tmp, &ifmgd->work_list, list) {
2148                 if (time_is_after_jiffies(wk->timeout)) {
2149                         /*
2150                          * This work item isn't supposed to be worked on
2151                          * right now, but take care to adjust the timer
2152                          * properly.
2153                          */
2154                         run_again(ifmgd, wk->timeout);
2155                         continue;
2156                 }
2157
2158                 switch (wk->state) {
2159                 default:
2160                         WARN_ON(1);
2161                         /* fall through */
2162                 case IEEE80211_MGD_STATE_IDLE:
2163                         /* nothing */
2164                         rma = RX_MGMT_NONE;
2165                         break;
2166                 case IEEE80211_MGD_STATE_PROBE:
2167                         rma = ieee80211_direct_probe(sdata, wk);
2168                         break;
2169                 case IEEE80211_MGD_STATE_AUTH:
2170                         rma = ieee80211_authenticate(sdata, wk);
2171                         break;
2172                 case IEEE80211_MGD_STATE_ASSOC:
2173                         rma = ieee80211_associate(sdata, wk);
2174                         break;
2175                 }
2176
2177                 switch (rma) {
2178                 case RX_MGMT_NONE:
2179                         /* no action required */
2180                         break;
2181                 case RX_MGMT_CFG80211_AUTH_TO:
2182                 case RX_MGMT_CFG80211_ASSOC_TO:
2183                         list_del(&wk->list);
2184                         list_add(&wk->list, &free_work);
2185                         wk->tries = rma; /* small abuse but only local */
2186                         break;
2187                 default:
2188                         WARN(1, "unexpected: %d", rma);
2189                 }
2190         }
2191
2192         list_for_each_entry(wk, &ifmgd->work_list, list) {
2193                 if (wk->state != IEEE80211_MGD_STATE_IDLE) {
2194                         anybusy = true;
2195                         break;
2196                 }
2197         }
2198         if (!anybusy &&
2199             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request))
2200                 ieee80211_queue_delayed_work(&local->hw,
2201                                              &local->scan_work,
2202                                              round_jiffies_relative(0));
2203
2204         mutex_unlock(&ifmgd->mtx);
2205
2206         list_for_each_entry_safe(wk, tmp, &free_work, list) {
2207                 switch (wk->tries) {
2208                 case RX_MGMT_CFG80211_AUTH_TO:
2209                         cfg80211_send_auth_timeout(sdata->dev,
2210                                                    wk->bss->cbss.bssid);
2211                         break;
2212                 case RX_MGMT_CFG80211_ASSOC_TO:
2213                         cfg80211_send_assoc_timeout(sdata->dev,
2214                                                     wk->bss->cbss.bssid);
2215                         break;
2216                 default:
2217                         WARN(1, "unexpected: %d", wk->tries);
2218                 }
2219
2220                 list_del(&wk->list);
2221                 kfree(wk);
2222         }
2223
2224         ieee80211_recalc_idle(local);
2225 }
2226
2227 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2228 {
2229         struct ieee80211_sub_if_data *sdata =
2230                 (struct ieee80211_sub_if_data *) data;
2231         struct ieee80211_local *local = sdata->local;
2232
2233         if (local->quiescing)
2234                 return;
2235
2236         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
2237 }
2238
2239 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2240 {
2241         struct ieee80211_sub_if_data *sdata =
2242                 (struct ieee80211_sub_if_data *) data;
2243         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2244         struct ieee80211_local *local = sdata->local;
2245
2246         if (local->quiescing)
2247                 return;
2248
2249         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2250 }
2251
2252 static void ieee80211_sta_monitor_work(struct work_struct *work)
2253 {
2254         struct ieee80211_sub_if_data *sdata =
2255                 container_of(work, struct ieee80211_sub_if_data,
2256                              u.mgd.monitor_work);
2257
2258         ieee80211_mgd_probe_ap(sdata, false);
2259 }
2260
2261 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2262 {
2263         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2264                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
2265                                         IEEE80211_STA_CONNECTION_POLL);
2266
2267                 /* let's probe the connection once */
2268                 ieee80211_queue_work(&sdata->local->hw,
2269                            &sdata->u.mgd.monitor_work);
2270                 /* and do all the other regular work too */
2271                 ieee80211_queue_work(&sdata->local->hw,
2272                            &sdata->u.mgd.work);
2273         }
2274 }
2275
2276 #ifdef CONFIG_PM
2277 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2278 {
2279         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2280
2281         /*
2282          * we need to use atomic bitops for the running bits
2283          * only because both timers might fire at the same
2284          * time -- the code here is properly synchronised.
2285          */
2286
2287         cancel_work_sync(&ifmgd->work);
2288         cancel_work_sync(&ifmgd->beacon_loss_work);
2289         if (del_timer_sync(&ifmgd->timer))
2290                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2291
2292         cancel_work_sync(&ifmgd->chswitch_work);
2293         if (del_timer_sync(&ifmgd->chswitch_timer))
2294                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2295
2296         cancel_work_sync(&ifmgd->monitor_work);
2297         /* these will just be re-established on connection */
2298         del_timer_sync(&ifmgd->conn_mon_timer);
2299         del_timer_sync(&ifmgd->bcn_mon_timer);
2300 }
2301
2302 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2303 {
2304         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2305
2306         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2307                 add_timer(&ifmgd->timer);
2308         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2309                 add_timer(&ifmgd->chswitch_timer);
2310 }
2311 #endif
2312
2313 /* interface setup */
2314 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2315 {
2316         struct ieee80211_if_managed *ifmgd;
2317
2318         ifmgd = &sdata->u.mgd;
2319         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
2320         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2321         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2322         INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
2323         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2324                     (unsigned long) sdata);
2325         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2326                     (unsigned long) sdata);
2327         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2328                     (unsigned long) sdata);
2329         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2330                     (unsigned long) sdata);
2331         skb_queue_head_init(&ifmgd->skb_queue);
2332
2333         INIT_LIST_HEAD(&ifmgd->work_list);
2334
2335         ifmgd->capab = WLAN_CAPABILITY_ESS;
2336         ifmgd->flags = 0;
2337         if (sdata->local->hw.queues >= 4)
2338                 ifmgd->flags |= IEEE80211_STA_WMM_ENABLED;
2339
2340         mutex_init(&ifmgd->mtx);
2341 }
2342
2343 /* scan finished notification */
2344 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2345 {
2346         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2347
2348         /* Restart STA timers */
2349         rcu_read_lock();
2350         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2351                 ieee80211_restart_sta_timer(sdata);
2352         rcu_read_unlock();
2353 }
2354
2355 int ieee80211_max_network_latency(struct notifier_block *nb,
2356                                   unsigned long data, void *dummy)
2357 {
2358         s32 latency_usec = (s32) data;
2359         struct ieee80211_local *local =
2360                 container_of(nb, struct ieee80211_local,
2361                              network_latency_notifier);
2362
2363         mutex_lock(&local->iflist_mtx);
2364         ieee80211_recalc_ps(local, latency_usec);
2365         mutex_unlock(&local->iflist_mtx);
2366
2367         return 0;
2368 }
2369
2370 /* config hooks */
2371 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2372                        struct cfg80211_auth_request *req)
2373 {
2374         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2375         const u8 *ssid;
2376         struct ieee80211_mgd_work *wk;
2377         u16 auth_alg;
2378
2379         switch (req->auth_type) {
2380         case NL80211_AUTHTYPE_OPEN_SYSTEM:
2381                 auth_alg = WLAN_AUTH_OPEN;
2382                 break;
2383         case NL80211_AUTHTYPE_SHARED_KEY:
2384                 auth_alg = WLAN_AUTH_SHARED_KEY;
2385                 break;
2386         case NL80211_AUTHTYPE_FT:
2387                 auth_alg = WLAN_AUTH_FT;
2388                 break;
2389         case NL80211_AUTHTYPE_NETWORK_EAP:
2390                 auth_alg = WLAN_AUTH_LEAP;
2391                 break;
2392         default:
2393                 return -EOPNOTSUPP;
2394         }
2395
2396         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2397         if (!wk)
2398                 return -ENOMEM;
2399
2400         wk->bss = (void *)req->bss;
2401
2402         if (req->ie && req->ie_len) {
2403                 memcpy(wk->ie, req->ie, req->ie_len);
2404                 wk->ie_len = req->ie_len;
2405         }
2406
2407         if (req->key && req->key_len) {
2408                 wk->key_len = req->key_len;
2409                 wk->key_idx = req->key_idx;
2410                 memcpy(wk->key, req->key, req->key_len);
2411         }
2412
2413         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2414         memcpy(wk->ssid, ssid + 2, ssid[1]);
2415         wk->ssid_len = ssid[1];
2416
2417         wk->state = IEEE80211_MGD_STATE_PROBE;
2418         wk->auth_alg = auth_alg;
2419         wk->timeout = jiffies; /* run right away */
2420
2421         /*
2422          * XXX: if still associated need to tell AP that we're going
2423          *      to sleep and then change channel etc.
2424          */
2425         sdata->local->oper_channel = req->bss->channel;
2426         ieee80211_hw_config(sdata->local, 0);
2427
2428         mutex_lock(&ifmgd->mtx);
2429         list_add(&wk->list, &sdata->u.mgd.work_list);
2430         mutex_unlock(&ifmgd->mtx);
2431
2432         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.work);
2433         return 0;
2434 }
2435
2436 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2437                         struct cfg80211_assoc_request *req)
2438 {
2439         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2440         struct ieee80211_mgd_work *wk, *found = NULL;
2441         int i, err;
2442
2443         mutex_lock(&ifmgd->mtx);
2444
2445         list_for_each_entry(wk, &ifmgd->work_list, list) {
2446                 if (&wk->bss->cbss == req->bss &&
2447                     wk->state == IEEE80211_MGD_STATE_IDLE) {
2448                         found = wk;
2449                         break;
2450                 }
2451         }
2452
2453         if (!found) {
2454                 err = -ENOLINK;
2455                 goto out;
2456         }
2457
2458         list_del(&found->list);
2459
2460         wk = krealloc(found, sizeof(*wk) + req->ie_len, GFP_KERNEL);
2461         if (!wk) {
2462                 list_add(&found->list, &ifmgd->work_list);
2463                 err = -ENOMEM;
2464                 goto out;
2465         }
2466
2467         list_add(&wk->list, &ifmgd->work_list);
2468
2469         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2470
2471         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2472                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2473                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2474                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2475                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2476
2477         sdata->local->oper_channel = req->bss->channel;
2478         ieee80211_hw_config(sdata->local, 0);
2479
2480         if (req->ie && req->ie_len) {
2481                 memcpy(wk->ie, req->ie, req->ie_len);
2482                 wk->ie_len = req->ie_len;
2483         } else
2484                 wk->ie_len = 0;
2485
2486         if (req->prev_bssid)
2487                 memcpy(wk->prev_bssid, req->prev_bssid, ETH_ALEN);
2488
2489         wk->state = IEEE80211_MGD_STATE_ASSOC;
2490         wk->tries = 0;
2491         wk->timeout = jiffies; /* run right away */
2492
2493         if (req->use_mfp) {
2494                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2495                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2496         } else {
2497                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2498                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2499         }
2500
2501         if (req->crypto.control_port)
2502                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2503         else
2504                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2505
2506         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.work);
2507
2508         err = 0;
2509
2510  out:
2511         mutex_unlock(&ifmgd->mtx);
2512         return err;
2513 }
2514
2515 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2516                          struct cfg80211_deauth_request *req,
2517                          void *cookie)
2518 {
2519         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2520         struct ieee80211_mgd_work *wk;
2521         const u8 *bssid = NULL;
2522         bool not_auth_yet = false;
2523
2524         mutex_lock(&ifmgd->mtx);
2525
2526         if (ifmgd->associated && &ifmgd->associated->cbss == req->bss) {
2527                 bssid = req->bss->bssid;
2528                 ieee80211_set_disassoc(sdata, true);
2529         } else list_for_each_entry(wk, &ifmgd->work_list, list) {
2530                 if (&wk->bss->cbss == req->bss) {
2531                         bssid = req->bss->bssid;
2532                         if (wk->state == IEEE80211_MGD_STATE_PROBE)
2533                                 not_auth_yet = true;
2534                         list_del(&wk->list);
2535                         kfree(wk);
2536                         break;
2537                 }
2538         }
2539
2540         /*
2541          * If somebody requests authentication and we haven't
2542          * sent out an auth frame yet there's no need to send
2543          * out a deauth frame either. If the state was PROBE,
2544          * then this is the case. If it's AUTH we have sent a
2545          * frame, and if it's IDLE we have completed the auth
2546          * process already.
2547          */
2548         if (not_auth_yet) {
2549                 mutex_unlock(&ifmgd->mtx);
2550                 __cfg80211_auth_canceled(sdata->dev, bssid);
2551                 return 0;
2552         }
2553
2554         /*
2555          * cfg80211 should catch this ... but it's racy since
2556          * we can receive a deauth frame, process it, hand it
2557          * to cfg80211 while that's in a locked section already
2558          * trying to tell us that the user wants to disconnect.
2559          */
2560         if (!bssid) {
2561                 mutex_unlock(&ifmgd->mtx);
2562                 return -ENOLINK;
2563         }
2564
2565         mutex_unlock(&ifmgd->mtx);
2566
2567         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2568                sdata->dev->name, bssid, req->reason_code);
2569
2570         ieee80211_send_deauth_disassoc(sdata, bssid,
2571                         IEEE80211_STYPE_DEAUTH, req->reason_code,
2572                         cookie);
2573
2574         ieee80211_recalc_idle(sdata->local);
2575
2576         return 0;
2577 }
2578
2579 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2580                            struct cfg80211_disassoc_request *req,
2581                            void *cookie)
2582 {
2583         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2584
2585         mutex_lock(&ifmgd->mtx);
2586
2587         /*
2588          * cfg80211 should catch this ... but it's racy since
2589          * we can receive a disassoc frame, process it, hand it
2590          * to cfg80211 while that's in a locked section already
2591          * trying to tell us that the user wants to disconnect.
2592          */
2593         if (&ifmgd->associated->cbss != req->bss) {
2594                 mutex_unlock(&ifmgd->mtx);
2595                 return -ENOLINK;
2596         }
2597
2598         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2599                sdata->dev->name, req->bss->bssid, req->reason_code);
2600
2601         ieee80211_set_disassoc(sdata, false);
2602
2603         mutex_unlock(&ifmgd->mtx);
2604
2605         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2606                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2607                         cookie);
2608
2609         ieee80211_recalc_idle(sdata->local);
2610
2611         return 0;
2612 }