mac80211: Disallow to set multicast BSSID
[linux-2.6.git] / net / mac80211 / mlme.c
1 /*
2  * BSS client mode implementation
3  * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.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/wireless.h>
19 #include <linux/random.h>
20 #include <linux/etherdevice.h>
21 #include <linux/rtnetlink.h>
22 #include <net/iw_handler.h>
23 #include <net/mac80211.h>
24 #include <asm/unaligned.h>
25
26 #include "ieee80211_i.h"
27 #include "rate.h"
28 #include "led.h"
29
30 #define IEEE80211_ASSOC_SCANS_MAX_TRIES 2
31 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
32 #define IEEE80211_AUTH_MAX_TRIES 3
33 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
34 #define IEEE80211_ASSOC_MAX_TRIES 3
35 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
36 #define IEEE80211_PROBE_INTERVAL (60 * HZ)
37 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
38 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
39 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
40 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
41
42 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
43 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
44
45 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
46
47
48 /* utils */
49 static int ecw2cw(int ecw)
50 {
51         return (1 << ecw) - 1;
52 }
53
54 static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie)
55 {
56         u8 *end, *pos;
57
58         pos = bss->ies;
59         if (pos == NULL)
60                 return NULL;
61         end = pos + bss->ies_len;
62
63         while (pos + 1 < end) {
64                 if (pos + 2 + pos[1] > end)
65                         break;
66                 if (pos[0] == ie)
67                         return pos;
68                 pos += 2 + pos[1];
69         }
70
71         return NULL;
72 }
73
74 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
75                                       struct ieee80211_supported_band *sband,
76                                       u64 *rates)
77 {
78         int i, j, count;
79         *rates = 0;
80         count = 0;
81         for (i = 0; i < bss->supp_rates_len; i++) {
82                 int rate = (bss->supp_rates[i] & 0x7F) * 5;
83
84                 for (j = 0; j < sband->n_bitrates; j++)
85                         if (sband->bitrates[j].bitrate == rate) {
86                                 *rates |= BIT(j);
87                                 count++;
88                                 break;
89                         }
90         }
91
92         return count;
93 }
94
95 /* also used by mesh code */
96 u64 ieee80211_sta_get_rates(struct ieee80211_local *local,
97                             struct ieee802_11_elems *elems,
98                             enum ieee80211_band band)
99 {
100         struct ieee80211_supported_band *sband;
101         struct ieee80211_rate *bitrates;
102         size_t num_rates;
103         u64 supp_rates;
104         int i, j;
105         sband = local->hw.wiphy->bands[band];
106
107         if (!sband) {
108                 WARN_ON(1);
109                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
110         }
111
112         bitrates = sband->bitrates;
113         num_rates = sband->n_bitrates;
114         supp_rates = 0;
115         for (i = 0; i < elems->supp_rates_len +
116                      elems->ext_supp_rates_len; i++) {
117                 u8 rate = 0;
118                 int own_rate;
119                 if (i < elems->supp_rates_len)
120                         rate = elems->supp_rates[i];
121                 else if (elems->ext_supp_rates)
122                         rate = elems->ext_supp_rates
123                                 [i - elems->supp_rates_len];
124                 own_rate = 5 * (rate & 0x7f);
125                 for (j = 0; j < num_rates; j++)
126                         if (bitrates[j].bitrate == own_rate)
127                                 supp_rates |= BIT(j);
128         }
129         return supp_rates;
130 }
131
132 /* frame sending functions */
133
134 /* also used by scanning code */
135 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
136                               u8 *ssid, size_t ssid_len)
137 {
138         struct ieee80211_local *local = sdata->local;
139         struct ieee80211_supported_band *sband;
140         struct sk_buff *skb;
141         struct ieee80211_mgmt *mgmt;
142         u8 *pos, *supp_rates, *esupp_rates = NULL;
143         int i;
144
145         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200);
146         if (!skb) {
147                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
148                        "request\n", sdata->dev->name);
149                 return;
150         }
151         skb_reserve(skb, local->hw.extra_tx_headroom);
152
153         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
154         memset(mgmt, 0, 24);
155         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
156                                           IEEE80211_STYPE_PROBE_REQ);
157         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
158         if (dst) {
159                 memcpy(mgmt->da, dst, ETH_ALEN);
160                 memcpy(mgmt->bssid, dst, ETH_ALEN);
161         } else {
162                 memset(mgmt->da, 0xff, ETH_ALEN);
163                 memset(mgmt->bssid, 0xff, ETH_ALEN);
164         }
165         pos = skb_put(skb, 2 + ssid_len);
166         *pos++ = WLAN_EID_SSID;
167         *pos++ = ssid_len;
168         memcpy(pos, ssid, ssid_len);
169
170         supp_rates = skb_put(skb, 2);
171         supp_rates[0] = WLAN_EID_SUPP_RATES;
172         supp_rates[1] = 0;
173         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
174
175         for (i = 0; i < sband->n_bitrates; i++) {
176                 struct ieee80211_rate *rate = &sband->bitrates[i];
177                 if (esupp_rates) {
178                         pos = skb_put(skb, 1);
179                         esupp_rates[1]++;
180                 } else if (supp_rates[1] == 8) {
181                         esupp_rates = skb_put(skb, 3);
182                         esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
183                         esupp_rates[1] = 1;
184                         pos = &esupp_rates[2];
185                 } else {
186                         pos = skb_put(skb, 1);
187                         supp_rates[1]++;
188                 }
189                 *pos = rate->bitrate / 5;
190         }
191
192         ieee80211_tx_skb(sdata, skb, 0);
193 }
194
195 static void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
196                                 struct ieee80211_if_sta *ifsta,
197                                 int transaction, u8 *extra, size_t extra_len,
198                                 int encrypt)
199 {
200         struct ieee80211_local *local = sdata->local;
201         struct sk_buff *skb;
202         struct ieee80211_mgmt *mgmt;
203
204         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
205                             sizeof(*mgmt) + 6 + extra_len);
206         if (!skb) {
207                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
208                        "frame\n", sdata->dev->name);
209                 return;
210         }
211         skb_reserve(skb, local->hw.extra_tx_headroom);
212
213         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
214         memset(mgmt, 0, 24 + 6);
215         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
216                                           IEEE80211_STYPE_AUTH);
217         if (encrypt)
218                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
219         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
220         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
221         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
222         mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg);
223         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
224         ifsta->auth_transaction = transaction + 1;
225         mgmt->u.auth.status_code = cpu_to_le16(0);
226         if (extra)
227                 memcpy(skb_put(skb, extra_len), extra, extra_len);
228
229         ieee80211_tx_skb(sdata, skb, encrypt);
230 }
231
232 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
233                                  struct ieee80211_if_sta *ifsta)
234 {
235         struct ieee80211_local *local = sdata->local;
236         struct sk_buff *skb;
237         struct ieee80211_mgmt *mgmt;
238         u8 *pos, *ies, *ht_ie;
239         int i, len, count, rates_len, supp_rates_len;
240         u16 capab;
241         struct ieee80211_bss *bss;
242         int wmm = 0;
243         struct ieee80211_supported_band *sband;
244         u64 rates = 0;
245
246         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
247                             sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
248                             ifsta->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 = ifsta->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         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
268                                    local->hw.conf.channel->center_freq,
269                                    ifsta->ssid, ifsta->ssid_len);
270         if (bss) {
271                 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
272                         capab |= WLAN_CAPABILITY_PRIVACY;
273                 if (bss->wmm_used)
274                         wmm = 1;
275
276                 /* get all rates supported by the device and the AP as
277                  * some APs don't like getting a superset of their rates
278                  * in the association request (e.g. D-Link DAP 1353 in
279                  * b-only mode) */
280                 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
281
282                 if ((bss->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
283                     (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
284                         capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
285
286                 ieee80211_rx_bss_put(local, bss);
287         } else {
288                 rates = ~0;
289                 rates_len = sband->n_bitrates;
290         }
291
292         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
293         memset(mgmt, 0, 24);
294         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
295         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
296         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
297
298         if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
299                 skb_put(skb, 10);
300                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
301                                                   IEEE80211_STYPE_REASSOC_REQ);
302                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
303                 mgmt->u.reassoc_req.listen_interval =
304                                 cpu_to_le16(local->hw.conf.listen_interval);
305                 memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
306                        ETH_ALEN);
307         } else {
308                 skb_put(skb, 4);
309                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
310                                                   IEEE80211_STYPE_ASSOC_REQ);
311                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
312                 mgmt->u.assoc_req.listen_interval =
313                                 cpu_to_le16(local->hw.conf.listen_interval);
314         }
315
316         /* SSID */
317         ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
318         *pos++ = WLAN_EID_SSID;
319         *pos++ = ifsta->ssid_len;
320         memcpy(pos, ifsta->ssid, ifsta->ssid_len);
321
322         /* add all rates which were marked to be used above */
323         supp_rates_len = rates_len;
324         if (supp_rates_len > 8)
325                 supp_rates_len = 8;
326
327         len = sband->n_bitrates;
328         pos = skb_put(skb, supp_rates_len + 2);
329         *pos++ = WLAN_EID_SUPP_RATES;
330         *pos++ = supp_rates_len;
331
332         count = 0;
333         for (i = 0; i < sband->n_bitrates; i++) {
334                 if (BIT(i) & rates) {
335                         int rate = sband->bitrates[i].bitrate;
336                         *pos++ = (u8) (rate / 5);
337                         if (++count == 8)
338                                 break;
339                 }
340         }
341
342         if (rates_len > count) {
343                 pos = skb_put(skb, rates_len - count + 2);
344                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
345                 *pos++ = rates_len - count;
346
347                 for (i++; i < sband->n_bitrates; i++) {
348                         if (BIT(i) & rates) {
349                                 int rate = sband->bitrates[i].bitrate;
350                                 *pos++ = (u8) (rate / 5);
351                         }
352                 }
353         }
354
355         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
356                 /* 1. power capabilities */
357                 pos = skb_put(skb, 4);
358                 *pos++ = WLAN_EID_PWR_CAPABILITY;
359                 *pos++ = 2;
360                 *pos++ = 0; /* min tx power */
361                 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
362
363                 /* 2. supported channels */
364                 /* TODO: get this in reg domain format */
365                 pos = skb_put(skb, 2 * sband->n_channels + 2);
366                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
367                 *pos++ = 2 * sband->n_channels;
368                 for (i = 0; i < sband->n_channels; i++) {
369                         *pos++ = ieee80211_frequency_to_channel(
370                                         sband->channels[i].center_freq);
371                         *pos++ = 1; /* one channel in the subband*/
372                 }
373         }
374
375         if (ifsta->extra_ie) {
376                 pos = skb_put(skb, ifsta->extra_ie_len);
377                 memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
378         }
379
380         if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
381                 pos = skb_put(skb, 9);
382                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
383                 *pos++ = 7; /* len */
384                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
385                 *pos++ = 0x50;
386                 *pos++ = 0xf2;
387                 *pos++ = 2; /* WME */
388                 *pos++ = 0; /* WME info */
389                 *pos++ = 1; /* WME ver */
390                 *pos++ = 0;
391         }
392
393         /* wmm support is a must to HT */
394         /*
395          * IEEE802.11n does not allow TKIP/WEP as pairwise
396          * ciphers in HT mode. We still associate in non-ht
397          * mode (11a/b/g) if any one of these ciphers is
398          * configured as pairwise.
399          */
400         if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
401             sband->ht_cap.ht_supported &&
402             (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) &&
403             ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
404             (!(ifsta->flags & IEEE80211_STA_TKIP_WEP_USED))) {
405                 struct ieee80211_ht_info *ht_info =
406                         (struct ieee80211_ht_info *)(ht_ie + 2);
407                 u16 cap = sband->ht_cap.cap;
408                 __le16 tmp;
409                 u32 flags = local->hw.conf.channel->flags;
410
411                 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
412                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
413                         if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
414                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
415                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
416                         }
417                         break;
418                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
419                         if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
420                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
421                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
422                         }
423                         break;
424                 }
425
426                 tmp = cpu_to_le16(cap);
427                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
428                 *pos++ = WLAN_EID_HT_CAPABILITY;
429                 *pos++ = sizeof(struct ieee80211_ht_cap);
430                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
431                 memcpy(pos, &tmp, sizeof(u16));
432                 pos += sizeof(u16);
433                 /* TODO: needs a define here for << 2 */
434                 *pos++ = sband->ht_cap.ampdu_factor |
435                          (sband->ht_cap.ampdu_density << 2);
436                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
437         }
438
439         kfree(ifsta->assocreq_ies);
440         ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
441         ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
442         if (ifsta->assocreq_ies)
443                 memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);
444
445         ieee80211_tx_skb(sdata, skb, 0);
446 }
447
448
449 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
450                                            u16 stype, u16 reason)
451 {
452         struct ieee80211_local *local = sdata->local;
453         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
454         struct sk_buff *skb;
455         struct ieee80211_mgmt *mgmt;
456
457         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
458         if (!skb) {
459                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
460                        "deauth/disassoc frame\n", sdata->dev->name);
461                 return;
462         }
463         skb_reserve(skb, local->hw.extra_tx_headroom);
464
465         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
466         memset(mgmt, 0, 24);
467         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
468         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
469         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
470         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
471         skb_put(skb, 2);
472         /* u.deauth.reason_code == u.disassoc.reason_code */
473         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
474
475         ieee80211_tx_skb(sdata, skb, 0);
476 }
477
478 /* MLME */
479 static void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
480                                          struct ieee80211_bss *bss)
481 {
482         struct ieee80211_local *local = sdata->local;
483         int i, have_higher_than_11mbit = 0;
484
485         /* cf. IEEE 802.11 9.2.12 */
486         for (i = 0; i < bss->supp_rates_len; i++)
487                 if ((bss->supp_rates[i] & 0x7f) * 5 > 110)
488                         have_higher_than_11mbit = 1;
489
490         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
491             have_higher_than_11mbit)
492                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
493         else
494                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
495
496         ieee80211_set_wmm_default(sdata);
497 }
498
499 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
500                                      struct ieee80211_if_sta *ifsta,
501                                      u8 *wmm_param, size_t wmm_param_len)
502 {
503         struct ieee80211_tx_queue_params params;
504         size_t left;
505         int count;
506         u8 *pos;
507
508         if (!(ifsta->flags & IEEE80211_STA_WMM_ENABLED))
509                 return;
510
511         if (!wmm_param)
512                 return;
513
514         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
515                 return;
516         count = wmm_param[6] & 0x0f;
517         if (count == ifsta->wmm_last_param_set)
518                 return;
519         ifsta->wmm_last_param_set = count;
520
521         pos = wmm_param + 8;
522         left = wmm_param_len - 8;
523
524         memset(&params, 0, sizeof(params));
525
526         if (!local->ops->conf_tx)
527                 return;
528
529         local->wmm_acm = 0;
530         for (; left >= 4; left -= 4, pos += 4) {
531                 int aci = (pos[0] >> 5) & 0x03;
532                 int acm = (pos[0] >> 4) & 0x01;
533                 int queue;
534
535                 switch (aci) {
536                 case 1:
537                         queue = 3;
538                         if (acm)
539                                 local->wmm_acm |= BIT(0) | BIT(3);
540                         break;
541                 case 2:
542                         queue = 1;
543                         if (acm)
544                                 local->wmm_acm |= BIT(4) | BIT(5);
545                         break;
546                 case 3:
547                         queue = 0;
548                         if (acm)
549                                 local->wmm_acm |= BIT(6) | BIT(7);
550                         break;
551                 case 0:
552                 default:
553                         queue = 2;
554                         if (acm)
555                                 local->wmm_acm |= BIT(1) | BIT(2);
556                         break;
557                 }
558
559                 params.aifs = pos[0] & 0x0f;
560                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
561                 params.cw_min = ecw2cw(pos[1] & 0x0f);
562                 params.txop = get_unaligned_le16(pos + 2);
563 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
564                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
565                        "cWmin=%d cWmax=%d txop=%d\n",
566                        local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
567                        params.cw_max, params.txop);
568 #endif
569                 /* TODO: handle ACM (block TX, fallback to next lowest allowed
570                  * AC for now) */
571                 if (local->ops->conf_tx(local_to_hw(local), queue, &params)) {
572                         printk(KERN_DEBUG "%s: failed to set TX queue "
573                                "parameters for queue %d\n", local->mdev->name, queue);
574                 }
575         }
576 }
577
578 static bool check_tim(struct ieee802_11_elems *elems, u16 aid, bool *is_mc)
579 {
580         u8 mask;
581         u8 index, indexn1, indexn2;
582         struct ieee80211_tim_ie *tim = (struct ieee80211_tim_ie *) elems->tim;
583
584         aid &= 0x3fff;
585         index = aid / 8;
586         mask  = 1 << (aid & 7);
587
588         if (tim->bitmap_ctrl & 0x01)
589                 *is_mc = true;
590
591         indexn1 = tim->bitmap_ctrl & 0xfe;
592         indexn2 = elems->tim_len + indexn1 - 4;
593
594         if (index < indexn1 || index > indexn2)
595                 return false;
596
597         index -= indexn1;
598
599         return !!(tim->virtual_map[index] & mask);
600 }
601
602 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
603                                            u16 capab, bool erp_valid, u8 erp)
604 {
605         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
606 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
607         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
608 #endif
609         u32 changed = 0;
610         bool use_protection;
611         bool use_short_preamble;
612         bool use_short_slot;
613
614         if (erp_valid) {
615                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
616                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
617         } else {
618                 use_protection = false;
619                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
620         }
621
622         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
623
624         if (use_protection != bss_conf->use_cts_prot) {
625 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
626                 if (net_ratelimit()) {
627                         printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
628                                sdata->dev->name,
629                                use_protection ? "enabled" : "disabled",
630                                ifsta->bssid);
631                 }
632 #endif
633                 bss_conf->use_cts_prot = use_protection;
634                 changed |= BSS_CHANGED_ERP_CTS_PROT;
635         }
636
637         if (use_short_preamble != bss_conf->use_short_preamble) {
638 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
639                 if (net_ratelimit()) {
640                         printk(KERN_DEBUG "%s: switched to %s barker preamble"
641                                " (BSSID=%pM)\n",
642                                sdata->dev->name,
643                                use_short_preamble ? "short" : "long",
644                                ifsta->bssid);
645                 }
646 #endif
647                 bss_conf->use_short_preamble = use_short_preamble;
648                 changed |= BSS_CHANGED_ERP_PREAMBLE;
649         }
650
651         if (use_short_slot != bss_conf->use_short_slot) {
652 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
653                 if (net_ratelimit()) {
654                         printk(KERN_DEBUG "%s: switched to %s slot time"
655                                " (BSSID=%pM)\n",
656                                sdata->dev->name,
657                                use_short_slot ? "short" : "long",
658                                ifsta->bssid);
659                 }
660 #endif
661                 bss_conf->use_short_slot = use_short_slot;
662                 changed |= BSS_CHANGED_ERP_SLOT;
663         }
664
665         return changed;
666 }
667
668 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata,
669                                         struct ieee80211_if_sta *ifsta)
670 {
671         union iwreq_data wrqu;
672         memset(&wrqu, 0, sizeof(wrqu));
673         if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
674                 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
675         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
676         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
677 }
678
679 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata,
680                                          struct ieee80211_if_sta *ifsta)
681 {
682         char *buf;
683         size_t len;
684         int i;
685         union iwreq_data wrqu;
686
687         if (!ifsta->assocreq_ies && !ifsta->assocresp_ies)
688                 return;
689
690         buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len +
691                                 ifsta->assocresp_ies_len), GFP_KERNEL);
692         if (!buf)
693                 return;
694
695         len = sprintf(buf, "ASSOCINFO(");
696         if (ifsta->assocreq_ies) {
697                 len += sprintf(buf + len, "ReqIEs=");
698                 for (i = 0; i < ifsta->assocreq_ies_len; i++) {
699                         len += sprintf(buf + len, "%02x",
700                                        ifsta->assocreq_ies[i]);
701                 }
702         }
703         if (ifsta->assocresp_ies) {
704                 if (ifsta->assocreq_ies)
705                         len += sprintf(buf + len, " ");
706                 len += sprintf(buf + len, "RespIEs=");
707                 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
708                         len += sprintf(buf + len, "%02x",
709                                        ifsta->assocresp_ies[i]);
710                 }
711         }
712         len += sprintf(buf + len, ")");
713
714         if (len > IW_CUSTOM_MAX) {
715                 len = sprintf(buf, "ASSOCRESPIE=");
716                 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
717                         len += sprintf(buf + len, "%02x",
718                                        ifsta->assocresp_ies[i]);
719                 }
720         }
721
722         if (len <= IW_CUSTOM_MAX) {
723                 memset(&wrqu, 0, sizeof(wrqu));
724                 wrqu.data.length = len;
725                 wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
726         }
727
728         kfree(buf);
729 }
730
731
732 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
733                                      struct ieee80211_if_sta *ifsta,
734                                      u32 bss_info_changed)
735 {
736         struct ieee80211_local *local = sdata->local;
737         struct ieee80211_conf *conf = &local_to_hw(local)->conf;
738
739         struct ieee80211_bss *bss;
740
741         bss_info_changed |= BSS_CHANGED_ASSOC;
742         ifsta->flags |= IEEE80211_STA_ASSOCIATED;
743
744         if (sdata->vif.type != NL80211_IFTYPE_STATION)
745                 return;
746
747         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
748                                    conf->channel->center_freq,
749                                    ifsta->ssid, ifsta->ssid_len);
750         if (bss) {
751                 /* set timing information */
752                 sdata->vif.bss_conf.beacon_int = bss->beacon_int;
753                 sdata->vif.bss_conf.timestamp = bss->timestamp;
754                 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
755
756                 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
757                         bss->capability, bss->has_erp_value, bss->erp_value);
758
759                 ieee80211_rx_bss_put(local, bss);
760         }
761
762         ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
763         memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
764         ieee80211_sta_send_associnfo(sdata, ifsta);
765
766         ifsta->last_probe = jiffies;
767         ieee80211_led_assoc(local, 1);
768
769         sdata->vif.bss_conf.assoc = 1;
770         /*
771          * For now just always ask the driver to update the basic rateset
772          * when we have associated, we aren't checking whether it actually
773          * changed or not.
774          */
775         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
776         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
777
778         if (local->powersave &&
779                         !(local->hw.flags & IEEE80211_HW_NO_STACK_DYNAMIC_PS)) {
780                 if (local->dynamic_ps_timeout > 0)
781                         mod_timer(&local->dynamic_ps_timer, jiffies +
782                                   msecs_to_jiffies(local->dynamic_ps_timeout));
783                 else {
784                         ieee80211_send_nullfunc(local, sdata, 1);
785                         conf->flags |= IEEE80211_CONF_PS;
786                         ieee80211_hw_config(local,
787                                             IEEE80211_CONF_CHANGE_PS);
788                 }
789         }
790
791         netif_tx_start_all_queues(sdata->dev);
792         netif_carrier_on(sdata->dev);
793
794         ieee80211_sta_send_apinfo(sdata, ifsta);
795 }
796
797 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
798                                    struct ieee80211_if_sta *ifsta)
799 {
800         ifsta->direct_probe_tries++;
801         if (ifsta->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
802                 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
803                        sdata->dev->name, ifsta->bssid);
804                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
805                 ieee80211_sta_send_apinfo(sdata, ifsta);
806                 return;
807         }
808
809         printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
810                         sdata->dev->name, ifsta->bssid,
811                         ifsta->direct_probe_tries);
812
813         ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
814
815         set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifsta->request);
816
817         /* Direct probe is sent to broadcast address as some APs
818          * will not answer to direct packet in unassociated state.
819          */
820         ieee80211_send_probe_req(sdata, NULL,
821                                  ifsta->ssid, ifsta->ssid_len);
822
823         mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
824 }
825
826
827 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
828                                    struct ieee80211_if_sta *ifsta)
829 {
830         ifsta->auth_tries++;
831         if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
832                 printk(KERN_DEBUG "%s: authentication with AP %pM"
833                        " timed out\n",
834                        sdata->dev->name, ifsta->bssid);
835                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
836                 ieee80211_sta_send_apinfo(sdata, ifsta);
837                 return;
838         }
839
840         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
841         printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
842                sdata->dev->name, ifsta->bssid);
843
844         ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0);
845
846         mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
847 }
848
849 /*
850  * The disassoc 'reason' argument can be either our own reason
851  * if self disconnected or a reason code from the AP.
852  */
853 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
854                                    struct ieee80211_if_sta *ifsta, bool deauth,
855                                    bool self_disconnected, u16 reason)
856 {
857         struct ieee80211_local *local = sdata->local;
858         struct sta_info *sta;
859         u32 changed = 0, config_changed = 0;
860
861         rcu_read_lock();
862
863         sta = sta_info_get(local, ifsta->bssid);
864         if (!sta) {
865                 rcu_read_unlock();
866                 return;
867         }
868
869         if (deauth) {
870                 ifsta->direct_probe_tries = 0;
871                 ifsta->auth_tries = 0;
872         }
873         ifsta->assoc_scan_tries = 0;
874         ifsta->assoc_tries = 0;
875
876         netif_tx_stop_all_queues(sdata->dev);
877         netif_carrier_off(sdata->dev);
878
879         ieee80211_sta_tear_down_BA_sessions(sdata, sta->sta.addr);
880
881         if (self_disconnected) {
882                 if (deauth)
883                         ieee80211_send_deauth_disassoc(sdata,
884                                 IEEE80211_STYPE_DEAUTH, reason);
885                 else
886                         ieee80211_send_deauth_disassoc(sdata,
887                                 IEEE80211_STYPE_DISASSOC, reason);
888         }
889
890         ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
891         changed |= ieee80211_reset_erp_info(sdata);
892
893         ieee80211_led_assoc(local, 0);
894         changed |= BSS_CHANGED_ASSOC;
895         sdata->vif.bss_conf.assoc = false;
896
897         ieee80211_sta_send_apinfo(sdata, ifsta);
898
899         if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT)
900                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
901
902         rcu_read_unlock();
903
904         local->oper_channel_type = NL80211_CHAN_NO_HT;
905         config_changed |= IEEE80211_CONF_CHANGE_HT;
906
907         del_timer_sync(&local->dynamic_ps_timer);
908         cancel_work_sync(&local->dynamic_ps_enable_work);
909
910         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
911                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
912                 config_changed |= IEEE80211_CONF_CHANGE_PS;
913         }
914
915         ieee80211_hw_config(local, config_changed);
916         ieee80211_bss_info_change_notify(sdata, changed);
917
918         rcu_read_lock();
919
920         sta = sta_info_get(local, ifsta->bssid);
921         if (!sta) {
922                 rcu_read_unlock();
923                 return;
924         }
925
926         sta_info_unlink(&sta);
927
928         rcu_read_unlock();
929
930         sta_info_destroy(sta);
931 }
932
933 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
934 {
935         if (!sdata || !sdata->default_key ||
936             sdata->default_key->conf.alg != ALG_WEP)
937                 return 0;
938         return 1;
939 }
940
941 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
942                                       struct ieee80211_if_sta *ifsta)
943 {
944         struct ieee80211_local *local = sdata->local;
945         struct ieee80211_bss *bss;
946         int bss_privacy;
947         int wep_privacy;
948         int privacy_invoked;
949
950         if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
951                 return 0;
952
953         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
954                                    local->hw.conf.channel->center_freq,
955                                    ifsta->ssid, ifsta->ssid_len);
956         if (!bss)
957                 return 0;
958
959         bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
960         wep_privacy = !!ieee80211_sta_wep_configured(sdata);
961         privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
962
963         ieee80211_rx_bss_put(local, bss);
964
965         if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
966                 return 0;
967
968         return 1;
969 }
970
971 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
972                                 struct ieee80211_if_sta *ifsta)
973 {
974         ifsta->assoc_tries++;
975         if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
976                 printk(KERN_DEBUG "%s: association with AP %pM"
977                        " timed out\n",
978                        sdata->dev->name, ifsta->bssid);
979                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
980                 ieee80211_sta_send_apinfo(sdata, ifsta);
981                 return;
982         }
983
984         ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
985         printk(KERN_DEBUG "%s: associate with AP %pM\n",
986                sdata->dev->name, ifsta->bssid);
987         if (ieee80211_privacy_mismatch(sdata, ifsta)) {
988                 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
989                        "mixed-cell disabled - abort association\n", sdata->dev->name);
990                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
991                 return;
992         }
993
994         ieee80211_send_assoc(sdata, ifsta);
995
996         mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
997 }
998
999
1000 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
1001                                  struct ieee80211_if_sta *ifsta)
1002 {
1003         struct ieee80211_local *local = sdata->local;
1004         struct sta_info *sta;
1005         int disassoc;
1006
1007         /* TODO: start monitoring current AP signal quality and number of
1008          * missed beacons. Scan other channels every now and then and search
1009          * for better APs. */
1010         /* TODO: remove expired BSSes */
1011
1012         ifsta->state = IEEE80211_STA_MLME_ASSOCIATED;
1013
1014         rcu_read_lock();
1015
1016         sta = sta_info_get(local, ifsta->bssid);
1017         if (!sta) {
1018                 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
1019                        sdata->dev->name, ifsta->bssid);
1020                 disassoc = 1;
1021         } else {
1022                 disassoc = 0;
1023                 if (time_after(jiffies,
1024                                sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
1025                         if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
1026                                 printk(KERN_DEBUG "%s: No ProbeResp from "
1027                                        "current AP %pM - assume out of "
1028                                        "range\n",
1029                                        sdata->dev->name, ifsta->bssid);
1030                                 disassoc = 1;
1031                         } else
1032                                 ieee80211_send_probe_req(sdata, ifsta->bssid,
1033                                                          ifsta->ssid,
1034                                                          ifsta->ssid_len);
1035                         ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
1036                 } else {
1037                         ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1038                         if (time_after(jiffies, ifsta->last_probe +
1039                                        IEEE80211_PROBE_INTERVAL)) {
1040                                 ifsta->last_probe = jiffies;
1041                                 ieee80211_send_probe_req(sdata, ifsta->bssid,
1042                                                          ifsta->ssid,
1043                                                          ifsta->ssid_len);
1044                         }
1045                 }
1046         }
1047
1048         rcu_read_unlock();
1049
1050         if (disassoc)
1051                 ieee80211_set_disassoc(sdata, ifsta, true, true,
1052                                         WLAN_REASON_PREV_AUTH_NOT_VALID);
1053         else
1054                 mod_timer(&ifsta->timer, jiffies +
1055                                       IEEE80211_MONITORING_INTERVAL);
1056 }
1057
1058
1059 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1060                                      struct ieee80211_if_sta *ifsta)
1061 {
1062         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1063         ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
1064         ieee80211_associate(sdata, ifsta);
1065 }
1066
1067
1068 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1069                                      struct ieee80211_if_sta *ifsta,
1070                                      struct ieee80211_mgmt *mgmt,
1071                                      size_t len)
1072 {
1073         u8 *pos;
1074         struct ieee802_11_elems elems;
1075
1076         pos = mgmt->u.auth.variable;
1077         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1078         if (!elems.challenge)
1079                 return;
1080         ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2,
1081                             elems.challenge_len + 2, 1);
1082 }
1083
1084 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1085                                    struct ieee80211_if_sta *ifsta,
1086                                    struct ieee80211_mgmt *mgmt,
1087                                    size_t len)
1088 {
1089         u16 auth_alg, auth_transaction, status_code;
1090
1091         if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1092             sdata->vif.type != NL80211_IFTYPE_ADHOC)
1093                 return;
1094
1095         if (len < 24 + 6)
1096                 return;
1097
1098         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1099             memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1100                 return;
1101
1102         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1103             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1104                 return;
1105
1106         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1107         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1108         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1109
1110         if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1111                 /*
1112                  * IEEE 802.11 standard does not require authentication in IBSS
1113                  * networks and most implementations do not seem to use it.
1114                  * However, try to reply to authentication attempts if someone
1115                  * has actually implemented this.
1116                  */
1117                 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1118                         return;
1119                 ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0);
1120         }
1121
1122         if (auth_alg != ifsta->auth_alg ||
1123             auth_transaction != ifsta->auth_transaction)
1124                 return;
1125
1126         if (status_code != WLAN_STATUS_SUCCESS) {
1127                 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1128                         u8 algs[3];
1129                         const int num_algs = ARRAY_SIZE(algs);
1130                         int i, pos;
1131                         algs[0] = algs[1] = algs[2] = 0xff;
1132                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1133                                 algs[0] = WLAN_AUTH_OPEN;
1134                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1135                                 algs[1] = WLAN_AUTH_SHARED_KEY;
1136                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1137                                 algs[2] = WLAN_AUTH_LEAP;
1138                         if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1139                                 pos = 0;
1140                         else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1141                                 pos = 1;
1142                         else
1143                                 pos = 2;
1144                         for (i = 0; i < num_algs; i++) {
1145                                 pos++;
1146                                 if (pos >= num_algs)
1147                                         pos = 0;
1148                                 if (algs[pos] == ifsta->auth_alg ||
1149                                     algs[pos] == 0xff)
1150                                         continue;
1151                                 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1152                                     !ieee80211_sta_wep_configured(sdata))
1153                                         continue;
1154                                 ifsta->auth_alg = algs[pos];
1155                                 break;
1156                         }
1157                 }
1158                 return;
1159         }
1160
1161         switch (ifsta->auth_alg) {
1162         case WLAN_AUTH_OPEN:
1163         case WLAN_AUTH_LEAP:
1164                 ieee80211_auth_completed(sdata, ifsta);
1165                 break;
1166         case WLAN_AUTH_SHARED_KEY:
1167                 if (ifsta->auth_transaction == 4)
1168                         ieee80211_auth_completed(sdata, ifsta);
1169                 else
1170                         ieee80211_auth_challenge(sdata, ifsta, mgmt, len);
1171                 break;
1172         }
1173 }
1174
1175
1176 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1177                                      struct ieee80211_if_sta *ifsta,
1178                                      struct ieee80211_mgmt *mgmt,
1179                                      size_t len)
1180 {
1181         u16 reason_code;
1182
1183         if (len < 24 + 2)
1184                 return;
1185
1186         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1187                 return;
1188
1189         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1190
1191         if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
1192                 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
1193                                 sdata->dev->name, reason_code);
1194
1195         if (ifsta->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1196             ifsta->state == IEEE80211_STA_MLME_ASSOCIATE ||
1197             ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1198                 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1199                 mod_timer(&ifsta->timer, jiffies +
1200                                       IEEE80211_RETRY_AUTH_INTERVAL);
1201         }
1202
1203         ieee80211_set_disassoc(sdata, ifsta, true, false, 0);
1204         ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1205 }
1206
1207
1208 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1209                                        struct ieee80211_if_sta *ifsta,
1210                                        struct ieee80211_mgmt *mgmt,
1211                                        size_t len)
1212 {
1213         u16 reason_code;
1214
1215         if (len < 24 + 2)
1216                 return;
1217
1218         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1219                 return;
1220
1221         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1222
1223         if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1224                 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1225                                 sdata->dev->name, reason_code);
1226
1227         if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1228                 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1229                 mod_timer(&ifsta->timer, jiffies +
1230                                       IEEE80211_RETRY_AUTH_INTERVAL);
1231         }
1232
1233         ieee80211_set_disassoc(sdata, ifsta, false, false, reason_code);
1234 }
1235
1236
1237 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1238                                          struct ieee80211_if_sta *ifsta,
1239                                          struct ieee80211_mgmt *mgmt,
1240                                          size_t len,
1241                                          int reassoc)
1242 {
1243         struct ieee80211_local *local = sdata->local;
1244         struct ieee80211_supported_band *sband;
1245         struct sta_info *sta;
1246         u64 rates, basic_rates;
1247         u16 capab_info, status_code, aid;
1248         struct ieee802_11_elems elems;
1249         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1250         u8 *pos;
1251         u32 changed = 0;
1252         int i, j;
1253         bool have_higher_than_11mbit = false, newsta = false;
1254         u16 ap_ht_cap_flags;
1255
1256         /* AssocResp and ReassocResp have identical structure, so process both
1257          * of them in this function. */
1258
1259         if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATE)
1260                 return;
1261
1262         if (len < 24 + 6)
1263                 return;
1264
1265         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1266                 return;
1267
1268         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1269         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1270         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1271
1272         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1273                "status=%d aid=%d)\n",
1274                sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1275                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1276
1277         if (status_code != WLAN_STATUS_SUCCESS) {
1278                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1279                        sdata->dev->name, status_code);
1280                 /* if this was a reassociation, ensure we try a "full"
1281                  * association next time. This works around some broken APs
1282                  * which do not correctly reject reassociation requests. */
1283                 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1284                 return;
1285         }
1286
1287         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1288                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1289                        "set\n", sdata->dev->name, aid);
1290         aid &= ~(BIT(15) | BIT(14));
1291
1292         pos = mgmt->u.assoc_resp.variable;
1293         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1294
1295         if (!elems.supp_rates) {
1296                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1297                        sdata->dev->name);
1298                 return;
1299         }
1300
1301         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1302         ifsta->aid = aid;
1303         ifsta->ap_capab = capab_info;
1304
1305         kfree(ifsta->assocresp_ies);
1306         ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1307         ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
1308         if (ifsta->assocresp_ies)
1309                 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
1310
1311         rcu_read_lock();
1312
1313         /* Add STA entry for the AP */
1314         sta = sta_info_get(local, ifsta->bssid);
1315         if (!sta) {
1316                 struct ieee80211_bss *bss;
1317
1318                 newsta = true;
1319
1320                 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
1321                 if (!sta) {
1322                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1323                                " the AP\n", sdata->dev->name);
1324                         rcu_read_unlock();
1325                         return;
1326                 }
1327                 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
1328                                            local->hw.conf.channel->center_freq,
1329                                            ifsta->ssid, ifsta->ssid_len);
1330                 if (bss) {
1331                         sta->last_signal = bss->signal;
1332                         sta->last_qual = bss->qual;
1333                         sta->last_noise = bss->noise;
1334                         ieee80211_rx_bss_put(local, bss);
1335                 }
1336
1337                 /* update new sta with its last rx activity */
1338                 sta->last_rx = jiffies;
1339         }
1340
1341         /*
1342          * FIXME: Do we really need to update the sta_info's information here?
1343          *        We already know about the AP (we found it in our list) so it
1344          *        should already be filled with the right info, no?
1345          *        As is stands, all this is racy because typically we assume
1346          *        the information that is filled in here (except flags) doesn't
1347          *        change while a STA structure is alive. As such, it should move
1348          *        to between the sta_info_alloc() and sta_info_insert() above.
1349          */
1350
1351         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1352                            WLAN_STA_AUTHORIZED);
1353
1354         rates = 0;
1355         basic_rates = 0;
1356         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1357
1358         for (i = 0; i < elems.supp_rates_len; i++) {
1359                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1360                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1361
1362                 if (rate > 110)
1363                         have_higher_than_11mbit = true;
1364
1365                 for (j = 0; j < sband->n_bitrates; j++) {
1366                         if (sband->bitrates[j].bitrate == rate) {
1367                                 rates |= BIT(j);
1368                                 if (is_basic)
1369                                         basic_rates |= BIT(j);
1370                                 break;
1371                         }
1372                 }
1373         }
1374
1375         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1376                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1377                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1378
1379                 if (rate > 110)
1380                         have_higher_than_11mbit = true;
1381
1382                 for (j = 0; j < sband->n_bitrates; j++) {
1383                         if (sband->bitrates[j].bitrate == rate) {
1384                                 rates |= BIT(j);
1385                                 if (is_basic)
1386                                         basic_rates |= BIT(j);
1387                                 break;
1388                         }
1389                 }
1390         }
1391
1392         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1393         sdata->vif.bss_conf.basic_rates = basic_rates;
1394
1395         /* cf. IEEE 802.11 9.2.12 */
1396         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1397             have_higher_than_11mbit)
1398                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1399         else
1400                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1401
1402         if (elems.ht_cap_elem)
1403                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1404                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1405
1406         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1407
1408         rate_control_rate_init(sta);
1409
1410         if (elems.wmm_param)
1411                 set_sta_flags(sta, WLAN_STA_WME);
1412
1413         if (newsta) {
1414                 int err = sta_info_insert(sta);
1415                 if (err) {
1416                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1417                                " the AP (error %d)\n", sdata->dev->name, err);
1418                         rcu_read_unlock();
1419                         return;
1420                 }
1421         }
1422
1423         rcu_read_unlock();
1424
1425         if (elems.wmm_param)
1426                 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1427                                          elems.wmm_param_len);
1428
1429         if (elems.ht_info_elem && elems.wmm_param &&
1430             (ifsta->flags & IEEE80211_STA_WMM_ENABLED))
1431                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1432                                                ap_ht_cap_flags);
1433
1434         /* set AID and assoc capability,
1435          * ieee80211_set_associated() will tell the driver */
1436         bss_conf->aid = aid;
1437         bss_conf->assoc_capability = capab_info;
1438         ieee80211_set_associated(sdata, ifsta, changed);
1439
1440         ieee80211_associated(sdata, ifsta);
1441 }
1442
1443
1444 static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
1445                                    struct ieee80211_if_sta *ifsta,
1446                                    struct ieee80211_bss *bss)
1447 {
1448         struct ieee80211_local *local = sdata->local;
1449         int res, rates, i, j;
1450         struct sk_buff *skb;
1451         struct ieee80211_mgmt *mgmt;
1452         u8 *pos;
1453         struct ieee80211_supported_band *sband;
1454         union iwreq_data wrqu;
1455
1456         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
1457         if (!skb) {
1458                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
1459                        "response\n", sdata->dev->name);
1460                 return -ENOMEM;
1461         }
1462
1463         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1464
1465         /* Remove possible STA entries from other IBSS networks. */
1466         sta_info_flush_delayed(sdata);
1467
1468         if (local->ops->reset_tsf) {
1469                 /* Reset own TSF to allow time synchronization work. */
1470                 local->ops->reset_tsf(local_to_hw(local));
1471         }
1472         memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
1473         res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
1474         if (res)
1475                 return res;
1476
1477         local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
1478
1479         sdata->drop_unencrypted = bss->capability &
1480                 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
1481
1482         res = ieee80211_set_freq(sdata, bss->freq);
1483
1484         if (res)
1485                 return res;
1486
1487         /* Build IBSS probe response */
1488
1489         skb_reserve(skb, local->hw.extra_tx_headroom);
1490
1491         mgmt = (struct ieee80211_mgmt *)
1492                 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1493         memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1494         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1495                                                 IEEE80211_STYPE_PROBE_RESP);
1496         memset(mgmt->da, 0xff, ETH_ALEN);
1497         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1498         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1499         mgmt->u.beacon.beacon_int =
1500                 cpu_to_le16(local->hw.conf.beacon_int);
1501         mgmt->u.beacon.timestamp = cpu_to_le64(bss->timestamp);
1502         mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
1503
1504         pos = skb_put(skb, 2 + ifsta->ssid_len);
1505         *pos++ = WLAN_EID_SSID;
1506         *pos++ = ifsta->ssid_len;
1507         memcpy(pos, ifsta->ssid, ifsta->ssid_len);
1508
1509         rates = bss->supp_rates_len;
1510         if (rates > 8)
1511                 rates = 8;
1512         pos = skb_put(skb, 2 + rates);
1513         *pos++ = WLAN_EID_SUPP_RATES;
1514         *pos++ = rates;
1515         memcpy(pos, bss->supp_rates, rates);
1516
1517         if (bss->band == IEEE80211_BAND_2GHZ) {
1518                 pos = skb_put(skb, 2 + 1);
1519                 *pos++ = WLAN_EID_DS_PARAMS;
1520                 *pos++ = 1;
1521                 *pos++ = ieee80211_frequency_to_channel(bss->freq);
1522         }
1523
1524         pos = skb_put(skb, 2 + 2);
1525         *pos++ = WLAN_EID_IBSS_PARAMS;
1526         *pos++ = 2;
1527         /* FIX: set ATIM window based on scan results */
1528         *pos++ = 0;
1529         *pos++ = 0;
1530
1531         if (bss->supp_rates_len > 8) {
1532                 rates = bss->supp_rates_len - 8;
1533                 pos = skb_put(skb, 2 + rates);
1534                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1535                 *pos++ = rates;
1536                 memcpy(pos, &bss->supp_rates[8], rates);
1537         }
1538
1539         ifsta->probe_resp = skb;
1540
1541         ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
1542
1543
1544         rates = 0;
1545         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1546         for (i = 0; i < bss->supp_rates_len; i++) {
1547                 int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
1548                 for (j = 0; j < sband->n_bitrates; j++)
1549                         if (sband->bitrates[j].bitrate == bitrate)
1550                                 rates |= BIT(j);
1551         }
1552         ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
1553
1554         ieee80211_sta_def_wmm_params(sdata, bss);
1555
1556         ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED;
1557         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1558
1559         ieee80211_led_assoc(local, true);
1560
1561         memset(&wrqu, 0, sizeof(wrqu));
1562         memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
1563         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
1564
1565         return res;
1566 }
1567
1568 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1569                                   struct ieee80211_mgmt *mgmt,
1570                                   size_t len,
1571                                   struct ieee80211_rx_status *rx_status,
1572                                   struct ieee802_11_elems *elems,
1573                                   bool beacon)
1574 {
1575         struct ieee80211_local *local = sdata->local;
1576         int freq;
1577         struct ieee80211_bss *bss;
1578         struct sta_info *sta;
1579         struct ieee80211_channel *channel;
1580         u64 beacon_timestamp, rx_timestamp;
1581         u64 supp_rates = 0;
1582         enum ieee80211_band band = rx_status->band;
1583
1584         if (elems->ds_params && elems->ds_params_len == 1)
1585                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1586         else
1587                 freq = rx_status->freq;
1588
1589         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1590
1591         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1592                 return;
1593
1594         if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
1595             memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
1596                 supp_rates = ieee80211_sta_get_rates(local, elems, band);
1597
1598                 rcu_read_lock();
1599
1600                 sta = sta_info_get(local, mgmt->sa);
1601                 if (sta) {
1602                         u64 prev_rates;
1603
1604                         prev_rates = sta->sta.supp_rates[band];
1605                         /* make sure mandatory rates are always added */
1606                         sta->sta.supp_rates[band] = supp_rates |
1607                                 ieee80211_mandatory_rates(local, band);
1608
1609 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1610                         if (sta->sta.supp_rates[band] != prev_rates)
1611                                 printk(KERN_DEBUG "%s: updated supp_rates set "
1612                                     "for %pM based on beacon info (0x%llx | "
1613                                     "0x%llx -> 0x%llx)\n",
1614                                     sdata->dev->name,
1615                                     sta->sta.addr,
1616                                     (unsigned long long) prev_rates,
1617                                     (unsigned long long) supp_rates,
1618                                     (unsigned long long) sta->sta.supp_rates[band]);
1619 #endif
1620                 } else {
1621                         ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1622                 }
1623
1624                 rcu_read_unlock();
1625         }
1626
1627         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1628                                         freq, beacon);
1629         if (!bss)
1630                 return;
1631
1632         /* was just updated in ieee80211_bss_info_update */
1633         beacon_timestamp = bss->timestamp;
1634
1635         /*
1636          * In STA mode, the remaining parameters should not be overridden
1637          * by beacons because they're not necessarily accurate there.
1638          */
1639         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1640             bss->last_probe_resp && beacon) {
1641                 ieee80211_rx_bss_put(local, bss);
1642                 return;
1643         }
1644
1645         /* check if we need to merge IBSS */
1646         if (sdata->vif.type == NL80211_IFTYPE_ADHOC && beacon &&
1647             bss->capability & WLAN_CAPABILITY_IBSS &&
1648             bss->freq == local->oper_channel->center_freq &&
1649             elems->ssid_len == sdata->u.sta.ssid_len &&
1650             memcmp(elems->ssid, sdata->u.sta.ssid,
1651                                 sdata->u.sta.ssid_len) == 0) {
1652                 if (rx_status->flag & RX_FLAG_TSFT) {
1653                         /* in order for correct IBSS merging we need mactime
1654                          *
1655                          * since mactime is defined as the time the first data
1656                          * symbol of the frame hits the PHY, and the timestamp
1657                          * of the beacon is defined as "the time that the data
1658                          * symbol containing the first bit of the timestamp is
1659                          * transmitted to the PHY plus the transmitting STA’s
1660                          * delays through its local PHY from the MAC-PHY
1661                          * interface to its interface with the WM"
1662                          * (802.11 11.1.2) - equals the time this bit arrives at
1663                          * the receiver - we have to take into account the
1664                          * offset between the two.
1665                          * e.g: at 1 MBit that means mactime is 192 usec earlier
1666                          * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
1667                          */
1668                         int rate;
1669                         if (rx_status->flag & RX_FLAG_HT) {
1670                                 rate = 65; /* TODO: HT rates */
1671                         } else {
1672                                 rate = local->hw.wiphy->bands[band]->
1673                                         bitrates[rx_status->rate_idx].bitrate;
1674                         }
1675                         rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
1676                 } else if (local && local->ops && local->ops->get_tsf)
1677                         /* second best option: get current TSF */
1678                         rx_timestamp = local->ops->get_tsf(local_to_hw(local));
1679                 else
1680                         /* can't merge without knowing the TSF */
1681                         rx_timestamp = -1LLU;
1682 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1683                 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
1684                        "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1685                        mgmt->sa, mgmt->bssid,
1686                        (unsigned long long)rx_timestamp,
1687                        (unsigned long long)beacon_timestamp,
1688                        (unsigned long long)(rx_timestamp - beacon_timestamp),
1689                        jiffies);
1690 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1691                 if (beacon_timestamp > rx_timestamp) {
1692 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1693                         printk(KERN_DEBUG "%s: beacon TSF higher than "
1694                                "local TSF - IBSS merge with BSSID %pM\n",
1695                                sdata->dev->name, mgmt->bssid);
1696 #endif
1697                         ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss);
1698                         ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1699                 }
1700         }
1701
1702         ieee80211_rx_bss_put(local, bss);
1703 }
1704
1705
1706 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1707                                          struct ieee80211_mgmt *mgmt,
1708                                          size_t len,
1709                                          struct ieee80211_rx_status *rx_status)
1710 {
1711         size_t baselen;
1712         struct ieee802_11_elems elems;
1713         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1714
1715         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1716                 return; /* ignore ProbeResp to foreign address */
1717
1718         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1719         if (baselen > len)
1720                 return;
1721
1722         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1723                                 &elems);
1724
1725         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1726
1727         /* direct probe may be part of the association flow */
1728         if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1729                                                         &ifsta->request)) {
1730                 printk(KERN_DEBUG "%s direct probe responded\n",
1731                        sdata->dev->name);
1732                 ieee80211_authenticate(sdata, ifsta);
1733         }
1734 }
1735
1736
1737 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1738                                      struct ieee80211_mgmt *mgmt,
1739                                      size_t len,
1740                                      struct ieee80211_rx_status *rx_status)
1741 {
1742         struct ieee80211_if_sta *ifsta;
1743         size_t baselen;
1744         struct ieee802_11_elems elems;
1745         struct ieee80211_local *local = sdata->local;
1746         u32 changed = 0;
1747         bool erp_valid, directed_tim, is_mc = false;
1748         u8 erp_value = 0;
1749
1750         /* Process beacon from the current BSS */
1751         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1752         if (baselen > len)
1753                 return;
1754
1755         ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1756
1757         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1758
1759         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1760                 return;
1761         ifsta = &sdata->u.sta;
1762
1763         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
1764             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1765                 return;
1766
1767         ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1768                                  elems.wmm_param_len);
1769
1770         if (!(local->hw.flags & IEEE80211_HW_NO_STACK_DYNAMIC_PS)) {
1771                 directed_tim = check_tim(&elems, ifsta->aid, &is_mc);
1772
1773                 if (directed_tim || is_mc) {
1774                         if (local->hw.conf.flags && IEEE80211_CONF_PS) {
1775                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1776                                 ieee80211_hw_config(local,
1777                                                 IEEE80211_CONF_CHANGE_PS);
1778                                 ieee80211_send_nullfunc(local, sdata, 0);
1779                         }
1780                 }
1781         }
1782
1783         if (elems.erp_info && elems.erp_info_len >= 1) {
1784                 erp_valid = true;
1785                 erp_value = elems.erp_info[0];
1786         } else {
1787                 erp_valid = false;
1788         }
1789         changed |= ieee80211_handle_bss_capability(sdata,
1790                         le16_to_cpu(mgmt->u.beacon.capab_info),
1791                         erp_valid, erp_value);
1792
1793
1794         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param) {
1795                 struct sta_info *sta;
1796                 struct ieee80211_supported_band *sband;
1797                 u16 ap_ht_cap_flags;
1798
1799                 rcu_read_lock();
1800
1801                 sta = sta_info_get(local, ifsta->bssid);
1802                 if (!sta) {
1803                         rcu_read_unlock();
1804                         return;
1805                 }
1806
1807                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1808
1809                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1810                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1811
1812                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1813
1814                 rcu_read_unlock();
1815
1816                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1817                                                ap_ht_cap_flags);
1818         }
1819
1820         if (elems.country_elem) {
1821                 /* Note we are only reviewing this on beacons
1822                  * for the BSSID we are associated to */
1823                 regulatory_hint_11d(local->hw.wiphy,
1824                         elems.country_elem, elems.country_elem_len);
1825         }
1826
1827         ieee80211_bss_info_change_notify(sdata, changed);
1828 }
1829
1830
1831 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1832                                         struct ieee80211_if_sta *ifsta,
1833                                         struct ieee80211_mgmt *mgmt,
1834                                         size_t len,
1835                                         struct ieee80211_rx_status *rx_status)
1836 {
1837         struct ieee80211_local *local = sdata->local;
1838         int tx_last_beacon;
1839         struct sk_buff *skb;
1840         struct ieee80211_mgmt *resp;
1841         u8 *pos, *end;
1842
1843         if (sdata->vif.type != NL80211_IFTYPE_ADHOC ||
1844             ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED ||
1845             len < 24 + 2 || !ifsta->probe_resp)
1846                 return;
1847
1848         if (local->ops->tx_last_beacon)
1849                 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
1850         else
1851                 tx_last_beacon = 1;
1852
1853 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1854         printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
1855                " (tx_last_beacon=%d)\n",
1856                sdata->dev->name, mgmt->sa, mgmt->da,
1857                mgmt->bssid, tx_last_beacon);
1858 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1859
1860         if (!tx_last_beacon)
1861                 return;
1862
1863         if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
1864             memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
1865                 return;
1866
1867         end = ((u8 *) mgmt) + len;
1868         pos = mgmt->u.probe_req.variable;
1869         if (pos[0] != WLAN_EID_SSID ||
1870             pos + 2 + pos[1] > end) {
1871 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1872                 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
1873                        "from %pM\n",
1874                        sdata->dev->name, mgmt->sa);
1875 #endif
1876                 return;
1877         }
1878         if (pos[1] != 0 &&
1879             (pos[1] != ifsta->ssid_len ||
1880              memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
1881                 /* Ignore ProbeReq for foreign SSID */
1882                 return;
1883         }
1884
1885         /* Reply with ProbeResp */
1886         skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
1887         if (!skb)
1888                 return;
1889
1890         resp = (struct ieee80211_mgmt *) skb->data;
1891         memcpy(resp->da, mgmt->sa, ETH_ALEN);
1892 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1893         printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
1894                sdata->dev->name, resp->da);
1895 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1896         ieee80211_tx_skb(sdata, skb, 0);
1897 }
1898
1899 void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
1900                            struct ieee80211_rx_status *rx_status)
1901 {
1902         struct ieee80211_local *local = sdata->local;
1903         struct ieee80211_if_sta *ifsta;
1904         struct ieee80211_mgmt *mgmt;
1905         u16 fc;
1906
1907         if (skb->len < 24)
1908                 goto fail;
1909
1910         ifsta = &sdata->u.sta;
1911
1912         mgmt = (struct ieee80211_mgmt *) skb->data;
1913         fc = le16_to_cpu(mgmt->frame_control);
1914
1915         switch (fc & IEEE80211_FCTL_STYPE) {
1916         case IEEE80211_STYPE_PROBE_REQ:
1917         case IEEE80211_STYPE_PROBE_RESP:
1918         case IEEE80211_STYPE_BEACON:
1919                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1920         case IEEE80211_STYPE_AUTH:
1921         case IEEE80211_STYPE_ASSOC_RESP:
1922         case IEEE80211_STYPE_REASSOC_RESP:
1923         case IEEE80211_STYPE_DEAUTH:
1924         case IEEE80211_STYPE_DISASSOC:
1925                 skb_queue_tail(&ifsta->skb_queue, skb);
1926                 queue_work(local->hw.workqueue, &ifsta->work);
1927                 return;
1928         }
1929
1930  fail:
1931         kfree_skb(skb);
1932 }
1933
1934 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1935                                          struct sk_buff *skb)
1936 {
1937         struct ieee80211_rx_status *rx_status;
1938         struct ieee80211_if_sta *ifsta;
1939         struct ieee80211_mgmt *mgmt;
1940         u16 fc;
1941
1942         ifsta = &sdata->u.sta;
1943
1944         rx_status = (struct ieee80211_rx_status *) skb->cb;
1945         mgmt = (struct ieee80211_mgmt *) skb->data;
1946         fc = le16_to_cpu(mgmt->frame_control);
1947
1948         switch (fc & IEEE80211_FCTL_STYPE) {
1949         case IEEE80211_STYPE_PROBE_REQ:
1950                 ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len,
1951                                             rx_status);
1952                 break;
1953         case IEEE80211_STYPE_PROBE_RESP:
1954                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
1955                 break;
1956         case IEEE80211_STYPE_BEACON:
1957                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
1958                 break;
1959         case IEEE80211_STYPE_AUTH:
1960                 ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len);
1961                 break;
1962         case IEEE80211_STYPE_ASSOC_RESP:
1963                 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
1964                 break;
1965         case IEEE80211_STYPE_REASSOC_RESP:
1966                 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
1967                 break;
1968         case IEEE80211_STYPE_DEAUTH:
1969                 ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len);
1970                 break;
1971         case IEEE80211_STYPE_DISASSOC:
1972                 ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len);
1973                 break;
1974         }
1975
1976         kfree_skb(skb);
1977 }
1978
1979
1980 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
1981 {
1982         struct ieee80211_local *local = sdata->local;
1983         int active = 0;
1984         struct sta_info *sta;
1985
1986         rcu_read_lock();
1987
1988         list_for_each_entry_rcu(sta, &local->sta_list, list) {
1989                 if (sta->sdata == sdata &&
1990                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
1991                                jiffies)) {
1992                         active++;
1993                         break;
1994                 }
1995         }
1996
1997         rcu_read_unlock();
1998
1999         return active;
2000 }
2001
2002
2003 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
2004                                      struct ieee80211_if_sta *ifsta)
2005 {
2006         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
2007
2008         ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
2009         if (ieee80211_sta_active_ibss(sdata))
2010                 return;
2011
2012         printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
2013                "IBSS networks with same SSID (merge)\n", sdata->dev->name);
2014         ieee80211_request_scan(sdata, ifsta->ssid, ifsta->ssid_len);
2015 }
2016
2017
2018 static void ieee80211_sta_timer(unsigned long data)
2019 {
2020         struct ieee80211_sub_if_data *sdata =
2021                 (struct ieee80211_sub_if_data *) data;
2022         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2023         struct ieee80211_local *local = sdata->local;
2024
2025         set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2026         queue_work(local->hw.workqueue, &ifsta->work);
2027 }
2028
2029 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata,
2030                                      struct ieee80211_if_sta *ifsta)
2031 {
2032         struct ieee80211_local *local = sdata->local;
2033
2034         if (local->ops->reset_tsf) {
2035                 /* Reset own TSF to allow time synchronization work. */
2036                 local->ops->reset_tsf(local_to_hw(local));
2037         }
2038
2039         ifsta->wmm_last_param_set = -1; /* allow any WMM update */
2040
2041
2042         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
2043                 ifsta->auth_alg = WLAN_AUTH_OPEN;
2044         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
2045                 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
2046         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
2047                 ifsta->auth_alg = WLAN_AUTH_LEAP;
2048         else
2049                 ifsta->auth_alg = WLAN_AUTH_OPEN;
2050         ifsta->auth_transaction = -1;
2051         ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
2052         ifsta->assoc_scan_tries = 0;
2053         ifsta->direct_probe_tries = 0;
2054         ifsta->auth_tries = 0;
2055         ifsta->assoc_tries = 0;
2056         netif_tx_stop_all_queues(sdata->dev);
2057         netif_carrier_off(sdata->dev);
2058 }
2059
2060
2061 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
2062                                     const char *ssid, int ssid_len)
2063 {
2064         int tmp, hidden_ssid;
2065
2066         if (ssid_len == ifsta->ssid_len &&
2067             !memcmp(ifsta->ssid, ssid, ssid_len))
2068                 return 1;
2069
2070         if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
2071                 return 0;
2072
2073         hidden_ssid = 1;
2074         tmp = ssid_len;
2075         while (tmp--) {
2076                 if (ssid[tmp] != '\0') {
2077                         hidden_ssid = 0;
2078                         break;
2079                 }
2080         }
2081
2082         if (hidden_ssid && (ifsta->ssid_len == ssid_len || ssid_len == 0))
2083                 return 1;
2084
2085         if (ssid_len == 1 && ssid[0] == ' ')
2086                 return 1;
2087
2088         return 0;
2089 }
2090
2091 static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata,
2092                                      struct ieee80211_if_sta *ifsta)
2093 {
2094         struct ieee80211_local *local = sdata->local;
2095         struct ieee80211_bss *bss;
2096         struct ieee80211_supported_band *sband;
2097         u8 bssid[ETH_ALEN], *pos;
2098         int i;
2099         int ret;
2100
2101 #if 0
2102         /* Easier testing, use fixed BSSID. */
2103         memset(bssid, 0xfe, ETH_ALEN);
2104 #else
2105         /* Generate random, not broadcast, locally administered BSSID. Mix in
2106          * own MAC address to make sure that devices that do not have proper
2107          * random number generator get different BSSID. */
2108         get_random_bytes(bssid, ETH_ALEN);
2109         for (i = 0; i < ETH_ALEN; i++)
2110                 bssid[i] ^= sdata->dev->dev_addr[i];
2111         bssid[0] &= ~0x01;
2112         bssid[0] |= 0x02;
2113 #endif
2114
2115         printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
2116                sdata->dev->name, bssid);
2117
2118         bss = ieee80211_rx_bss_add(local, bssid,
2119                                    local->hw.conf.channel->center_freq,
2120                                    sdata->u.sta.ssid, sdata->u.sta.ssid_len);
2121         if (!bss)
2122                 return -ENOMEM;
2123
2124         bss->band = local->hw.conf.channel->band;
2125         sband = local->hw.wiphy->bands[bss->band];
2126
2127         if (local->hw.conf.beacon_int == 0)
2128                 local->hw.conf.beacon_int = 100;
2129         bss->beacon_int = local->hw.conf.beacon_int;
2130         bss->last_update = jiffies;
2131         bss->capability = WLAN_CAPABILITY_IBSS;
2132
2133         if (sdata->default_key)
2134                 bss->capability |= WLAN_CAPABILITY_PRIVACY;
2135         else
2136                 sdata->drop_unencrypted = 0;
2137
2138         bss->supp_rates_len = sband->n_bitrates;
2139         pos = bss->supp_rates;
2140         for (i = 0; i < sband->n_bitrates; i++) {
2141                 int rate = sband->bitrates[i].bitrate;
2142                 *pos++ = (u8) (rate / 5);
2143         }
2144
2145         ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2146         ieee80211_rx_bss_put(local, bss);
2147         return ret;
2148 }
2149
2150
2151 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
2152                                    struct ieee80211_if_sta *ifsta)
2153 {
2154         struct ieee80211_local *local = sdata->local;
2155         struct ieee80211_bss *bss;
2156         int found = 0;
2157         u8 bssid[ETH_ALEN];
2158         int active_ibss;
2159
2160         if (ifsta->ssid_len == 0)
2161                 return -EINVAL;
2162
2163         active_ibss = ieee80211_sta_active_ibss(sdata);
2164 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2165         printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
2166                sdata->dev->name, active_ibss);
2167 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2168         spin_lock_bh(&local->bss_lock);
2169         list_for_each_entry(bss, &local->bss_list, list) {
2170                 if (ifsta->ssid_len != bss->ssid_len ||
2171                     memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
2172                     || !(bss->capability & WLAN_CAPABILITY_IBSS))
2173                         continue;
2174 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2175                 printk(KERN_DEBUG "   bssid=%pM found\n", bss->bssid);
2176 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2177                 memcpy(bssid, bss->bssid, ETH_ALEN);
2178                 found = 1;
2179                 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
2180                         break;
2181         }
2182         spin_unlock_bh(&local->bss_lock);
2183
2184 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2185         if (found)
2186                 printk(KERN_DEBUG "   sta_find_ibss: selected %pM current "
2187                        "%pM\n", bssid, ifsta->bssid);
2188 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2189
2190         if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2191                 int ret;
2192                 int search_freq;
2193
2194                 if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2195                         search_freq = bss->freq;
2196                 else
2197                         search_freq = local->hw.conf.channel->center_freq;
2198
2199                 bss = ieee80211_rx_bss_get(local, bssid, search_freq,
2200                                            ifsta->ssid, ifsta->ssid_len);
2201                 if (!bss)
2202                         goto dont_join;
2203
2204                 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
2205                        " based on configured SSID\n",
2206                        sdata->dev->name, bssid);
2207                 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2208                 ieee80211_rx_bss_put(local, bss);
2209                 return ret;
2210         }
2211
2212 dont_join:
2213 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2214         printk(KERN_DEBUG "   did not try to join ibss\n");
2215 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2216
2217         /* Selected IBSS not found in current scan results - try to scan */
2218         if (ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED &&
2219             !ieee80211_sta_active_ibss(sdata)) {
2220                 mod_timer(&ifsta->timer, jiffies +
2221                                       IEEE80211_IBSS_MERGE_INTERVAL);
2222         } else if (time_after(jiffies, local->last_scan_completed +
2223                               IEEE80211_SCAN_INTERVAL)) {
2224                 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
2225                        "join\n", sdata->dev->name);
2226                 return ieee80211_request_scan(sdata, ifsta->ssid,
2227                                               ifsta->ssid_len);
2228         } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) {
2229                 int interval = IEEE80211_SCAN_INTERVAL;
2230
2231                 if (time_after(jiffies, ifsta->ibss_join_req +
2232                                IEEE80211_IBSS_JOIN_TIMEOUT)) {
2233                         if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
2234                             (!(local->oper_channel->flags &
2235                                         IEEE80211_CHAN_NO_IBSS)))
2236                                 return ieee80211_sta_create_ibss(sdata, ifsta);
2237                         if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
2238                                 printk(KERN_DEBUG "%s: IBSS not allowed on"
2239                                        " %d MHz\n", sdata->dev->name,
2240                                        local->hw.conf.channel->center_freq);
2241                         }
2242
2243                         /* No IBSS found - decrease scan interval and continue
2244                          * scanning. */
2245                         interval = IEEE80211_SCAN_INTERVAL_SLOW;
2246                 }
2247
2248                 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2249                 mod_timer(&ifsta->timer, jiffies + interval);
2250                 return 0;
2251         }
2252
2253         return 0;
2254 }
2255
2256
2257 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
2258                                      struct ieee80211_if_sta *ifsta)
2259 {
2260         struct ieee80211_local *local = sdata->local;
2261         struct ieee80211_bss *bss, *selected = NULL;
2262         int top_rssi = 0, freq;
2263
2264         spin_lock_bh(&local->bss_lock);
2265         freq = local->oper_channel->center_freq;
2266         list_for_each_entry(bss, &local->bss_list, list) {
2267                 if (!(bss->capability & WLAN_CAPABILITY_ESS))
2268                         continue;
2269
2270                 if ((ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2271                         IEEE80211_STA_AUTO_BSSID_SEL |
2272                         IEEE80211_STA_AUTO_CHANNEL_SEL)) &&
2273                     (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
2274                      !!sdata->default_key))
2275                         continue;
2276
2277                 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
2278                     bss->freq != freq)
2279                         continue;
2280
2281                 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
2282                     memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
2283                         continue;
2284
2285                 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
2286                     !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
2287                         continue;
2288
2289                 if (!selected || top_rssi < bss->signal) {
2290                         selected = bss;
2291                         top_rssi = bss->signal;
2292                 }
2293         }
2294         if (selected)
2295                 atomic_inc(&selected->users);
2296         spin_unlock_bh(&local->bss_lock);
2297
2298         if (selected) {
2299                 ieee80211_set_freq(sdata, selected->freq);
2300                 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
2301                         ieee80211_sta_set_ssid(sdata, selected->ssid,
2302                                                selected->ssid_len);
2303                 ieee80211_sta_set_bssid(sdata, selected->bssid);
2304                 ieee80211_sta_def_wmm_params(sdata, selected);
2305
2306                 /* Send out direct probe if no probe resp was received or
2307                  * the one we have is outdated
2308                  */
2309                 if (!selected->last_probe_resp ||
2310                     time_after(jiffies, selected->last_probe_resp
2311                                         + IEEE80211_SCAN_RESULT_EXPIRE))
2312                         ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2313                 else
2314                         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2315
2316                 ieee80211_rx_bss_put(local, selected);
2317                 ieee80211_sta_reset_auth(sdata, ifsta);
2318                 return 0;
2319         } else {
2320                 if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2321                         ifsta->assoc_scan_tries++;
2322                         if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
2323                                 ieee80211_start_scan(sdata, NULL, 0);
2324                         else
2325                                 ieee80211_start_scan(sdata, ifsta->ssid,
2326                                                          ifsta->ssid_len);
2327                         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2328                         set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2329                 } else
2330                         ifsta->state = IEEE80211_STA_MLME_DISABLED;
2331         }
2332         return -1;
2333 }
2334
2335
2336 static void ieee80211_sta_work(struct work_struct *work)
2337 {
2338         struct ieee80211_sub_if_data *sdata =
2339                 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
2340         struct ieee80211_local *local = sdata->local;
2341         struct ieee80211_if_sta *ifsta;
2342         struct sk_buff *skb;
2343
2344         if (!netif_running(sdata->dev))
2345                 return;
2346
2347         if (local->sw_scanning || local->hw_scanning)
2348                 return;
2349
2350         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION &&
2351                     sdata->vif.type != NL80211_IFTYPE_ADHOC))
2352                 return;
2353         ifsta = &sdata->u.sta;
2354
2355         while ((skb = skb_dequeue(&ifsta->skb_queue)))
2356                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2357
2358         if (ifsta->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2359             ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2360             ifsta->state != IEEE80211_STA_MLME_ASSOCIATE &&
2361             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
2362                 ieee80211_start_scan(sdata, ifsta->scan_ssid,
2363                                      ifsta->scan_ssid_len);
2364                 return;
2365         }
2366
2367         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
2368                 if (ieee80211_sta_config_auth(sdata, ifsta))
2369                         return;
2370                 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2371         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
2372                 return;
2373
2374         switch (ifsta->state) {
2375         case IEEE80211_STA_MLME_DISABLED:
2376                 break;
2377         case IEEE80211_STA_MLME_DIRECT_PROBE:
2378                 ieee80211_direct_probe(sdata, ifsta);
2379                 break;
2380         case IEEE80211_STA_MLME_AUTHENTICATE:
2381                 ieee80211_authenticate(sdata, ifsta);
2382                 break;
2383         case IEEE80211_STA_MLME_ASSOCIATE:
2384                 ieee80211_associate(sdata, ifsta);
2385                 break;
2386         case IEEE80211_STA_MLME_ASSOCIATED:
2387                 ieee80211_associated(sdata, ifsta);
2388                 break;
2389         case IEEE80211_STA_MLME_IBSS_SEARCH:
2390                 ieee80211_sta_find_ibss(sdata, ifsta);
2391                 break;
2392         case IEEE80211_STA_MLME_IBSS_JOINED:
2393                 ieee80211_sta_merge_ibss(sdata, ifsta);
2394                 break;
2395         default:
2396                 WARN_ON(1);
2397                 break;
2398         }
2399
2400         if (ieee80211_privacy_mismatch(sdata, ifsta)) {
2401                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2402                        "mixed-cell disabled - disassociate\n", sdata->dev->name);
2403
2404                 ieee80211_set_disassoc(sdata, ifsta, false, true,
2405                                         WLAN_REASON_UNSPECIFIED);
2406         }
2407 }
2408
2409 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2410 {
2411         if (sdata->vif.type == NL80211_IFTYPE_STATION)
2412                 queue_work(sdata->local->hw.workqueue,
2413                            &sdata->u.sta.work);
2414 }
2415
2416 /* interface setup */
2417 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2418 {
2419         struct ieee80211_if_sta *ifsta;
2420
2421         ifsta = &sdata->u.sta;
2422         INIT_WORK(&ifsta->work, ieee80211_sta_work);
2423         setup_timer(&ifsta->timer, ieee80211_sta_timer,
2424                     (unsigned long) sdata);
2425         skb_queue_head_init(&ifsta->skb_queue);
2426
2427         ifsta->capab = WLAN_CAPABILITY_ESS;
2428         ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2429                 IEEE80211_AUTH_ALG_SHARED_KEY;
2430         ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
2431                 IEEE80211_STA_AUTO_BSSID_SEL |
2432                 IEEE80211_STA_AUTO_CHANNEL_SEL;
2433         if (ieee80211_num_regular_queues(&sdata->local->hw) >= 4)
2434                 ifsta->flags |= IEEE80211_STA_WMM_ENABLED;
2435 }
2436
2437 /*
2438  * Add a new IBSS station, will also be called by the RX code when,
2439  * in IBSS mode, receiving a frame from a yet-unknown station, hence
2440  * must be callable in atomic context.
2441  */
2442 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
2443                                         u8 *bssid,u8 *addr, u64 supp_rates)
2444 {
2445         struct ieee80211_local *local = sdata->local;
2446         struct sta_info *sta;
2447         int band = local->hw.conf.channel->band;
2448
2449         /* TODO: Could consider removing the least recently used entry and
2450          * allow new one to be added. */
2451         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
2452                 if (net_ratelimit()) {
2453                         printk(KERN_DEBUG "%s: No room for a new IBSS STA "
2454                                "entry %pM\n", sdata->dev->name, addr);
2455                 }
2456                 return NULL;
2457         }
2458
2459         if (compare_ether_addr(bssid, sdata->u.sta.bssid))
2460                 return NULL;
2461
2462 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2463         printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
2464                wiphy_name(local->hw.wiphy), addr, sdata->dev->name);
2465 #endif
2466
2467         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
2468         if (!sta)
2469                 return NULL;
2470
2471         set_sta_flags(sta, WLAN_STA_AUTHORIZED);
2472
2473         /* make sure mandatory rates are always added */
2474         sta->sta.supp_rates[band] = supp_rates |
2475                         ieee80211_mandatory_rates(local, band);
2476
2477         rate_control_rate_init(sta);
2478
2479         if (sta_info_insert(sta))
2480                 return NULL;
2481
2482         return sta;
2483 }
2484
2485 /* configuration hooks */
2486 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata,
2487                             struct ieee80211_if_sta *ifsta)
2488 {
2489         struct ieee80211_local *local = sdata->local;
2490
2491         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2492                 return;
2493
2494         if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
2495                              IEEE80211_STA_AUTO_BSSID_SEL)) &&
2496             (ifsta->flags & (IEEE80211_STA_SSID_SET |
2497                              IEEE80211_STA_AUTO_SSID_SEL))) {
2498
2499                 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED)
2500                         ieee80211_set_disassoc(sdata, ifsta, true, true,
2501                                                WLAN_REASON_DEAUTH_LEAVING);
2502
2503                 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2504                 queue_work(local->hw.workqueue, &ifsta->work);
2505         }
2506 }
2507
2508 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2509 {
2510         struct ieee80211_if_sta *ifsta;
2511
2512         if (len > IEEE80211_MAX_SSID_LEN)
2513                 return -EINVAL;
2514
2515         ifsta = &sdata->u.sta;
2516
2517         if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) {
2518                 memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
2519                 memcpy(ifsta->ssid, ssid, len);
2520                 ifsta->ssid_len = len;
2521                 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2522         }
2523
2524         if (len)
2525                 ifsta->flags |= IEEE80211_STA_SSID_SET;
2526         else
2527                 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
2528
2529         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
2530             !(ifsta->flags & IEEE80211_STA_BSSID_SET)) {
2531                 ifsta->ibss_join_req = jiffies;
2532                 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2533                 return ieee80211_sta_find_ibss(sdata, ifsta);
2534         }
2535
2536         return 0;
2537 }
2538
2539 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2540 {
2541         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2542         memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
2543         *len = ifsta->ssid_len;
2544         return 0;
2545 }
2546
2547 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2548 {
2549         struct ieee80211_if_sta *ifsta;
2550         int res;
2551         bool valid;
2552
2553         ifsta = &sdata->u.sta;
2554         valid = is_valid_ether_addr(bssid);
2555
2556         if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2557                 if(valid)
2558                         memcpy(ifsta->bssid, bssid, ETH_ALEN);
2559                 else
2560                         memset(ifsta->bssid, 0, ETH_ALEN);
2561                 res = 0;
2562                 /*
2563                  * Hack! See also ieee80211_sta_set_ssid.
2564                  */
2565                 if (netif_running(sdata->dev))
2566                         res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
2567                 if (res) {
2568                         printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2569                                "the low-level driver\n", sdata->dev->name);
2570                         return res;
2571                 }
2572         }
2573
2574         if (valid)
2575                 ifsta->flags |= IEEE80211_STA_BSSID_SET;
2576         else
2577                 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
2578
2579         return 0;
2580 }
2581
2582 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
2583 {
2584         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2585
2586         kfree(ifsta->extra_ie);
2587         if (len == 0) {
2588                 ifsta->extra_ie = NULL;
2589                 ifsta->extra_ie_len = 0;
2590                 return 0;
2591         }
2592         ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
2593         if (!ifsta->extra_ie) {
2594                 ifsta->extra_ie_len = 0;
2595                 return -ENOMEM;
2596         }
2597         memcpy(ifsta->extra_ie, ie, len);
2598         ifsta->extra_ie_len = len;
2599         return 0;
2600 }
2601
2602 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2603 {
2604         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2605
2606         printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2607                sdata->dev->name, reason);
2608
2609         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2610             sdata->vif.type != NL80211_IFTYPE_ADHOC)
2611                 return -EINVAL;
2612
2613         ieee80211_set_disassoc(sdata, ifsta, true, true, reason);
2614         return 0;
2615 }
2616
2617 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2618 {
2619         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2620
2621         printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2622                sdata->dev->name, reason);
2623
2624         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2625                 return -EINVAL;
2626
2627         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
2628                 return -1;
2629
2630         ieee80211_set_disassoc(sdata, ifsta, false, true, reason);
2631         return 0;
2632 }
2633
2634 /* scan finished notification */
2635 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2636 {
2637         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2638         struct ieee80211_if_sta *ifsta;
2639
2640         if (sdata && sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2641                 ifsta = &sdata->u.sta;
2642                 if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) ||
2643                     (!(ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED) &&
2644                     !ieee80211_sta_active_ibss(sdata)))
2645                         ieee80211_sta_find_ibss(sdata, ifsta);
2646         }
2647
2648         /* Restart STA timers */
2649         rcu_read_lock();
2650         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2651                 ieee80211_restart_sta_timer(sdata);
2652         rcu_read_unlock();
2653 }
2654
2655 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
2656 {
2657         struct ieee80211_local *local =
2658                 container_of(work, struct ieee80211_local,
2659                              dynamic_ps_disable_work);
2660
2661         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2662                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2663                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2664         }
2665
2666         ieee80211_wake_queues_by_reason(&local->hw,
2667                                         IEEE80211_QUEUE_STOP_REASON_PS);
2668 }
2669
2670 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
2671 {
2672         struct ieee80211_local *local =
2673                 container_of(work, struct ieee80211_local,
2674                              dynamic_ps_enable_work);
2675         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2676
2677         if (local->hw.conf.flags & IEEE80211_CONF_PS)
2678                 return;
2679
2680         ieee80211_send_nullfunc(local, sdata, 1);
2681         local->hw.conf.flags |= IEEE80211_CONF_PS;
2682
2683         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2684 }
2685
2686 void ieee80211_dynamic_ps_timer(unsigned long data)
2687 {
2688         struct ieee80211_local *local = (void *) data;
2689
2690         queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
2691 }