e4d1fca5c72d102feb860a39b0b9c458cbf0a4dc
[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.reassoc_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         if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
395             sband->ht_cap.ht_supported &&
396             (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) &&
397             ht_ie[1] >= sizeof(struct ieee80211_ht_info)) {
398                 struct ieee80211_ht_info *ht_info =
399                         (struct ieee80211_ht_info *)(ht_ie + 2);
400                 u16 cap = sband->ht_cap.cap;
401                 __le16 tmp;
402                 u32 flags = local->hw.conf.channel->flags;
403
404                 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
405                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
406                         if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
407                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
408                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
409                         }
410                         break;
411                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
412                         if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
413                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
414                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
415                         }
416                         break;
417                 }
418
419                 tmp = cpu_to_le16(cap);
420                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
421                 *pos++ = WLAN_EID_HT_CAPABILITY;
422                 *pos++ = sizeof(struct ieee80211_ht_cap);
423                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
424                 memcpy(pos, &tmp, sizeof(u16));
425                 pos += sizeof(u16);
426                 /* TODO: needs a define here for << 2 */
427                 *pos++ = sband->ht_cap.ampdu_factor |
428                          (sband->ht_cap.ampdu_density << 2);
429                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
430         }
431
432         kfree(ifsta->assocreq_ies);
433         ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
434         ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
435         if (ifsta->assocreq_ies)
436                 memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);
437
438         ieee80211_tx_skb(sdata, skb, 0);
439 }
440
441
442 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
443                                            u16 stype, u16 reason)
444 {
445         struct ieee80211_local *local = sdata->local;
446         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
447         struct sk_buff *skb;
448         struct ieee80211_mgmt *mgmt;
449
450         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
451         if (!skb) {
452                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
453                        "deauth/disassoc frame\n", sdata->dev->name);
454                 return;
455         }
456         skb_reserve(skb, local->hw.extra_tx_headroom);
457
458         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
459         memset(mgmt, 0, 24);
460         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
461         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
462         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
463         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
464         skb_put(skb, 2);
465         /* u.deauth.reason_code == u.disassoc.reason_code */
466         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
467
468         ieee80211_tx_skb(sdata, skb, 0);
469 }
470
471 /* MLME */
472 static void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
473                                          struct ieee80211_bss *bss)
474 {
475         struct ieee80211_local *local = sdata->local;
476         int i, have_higher_than_11mbit = 0;
477
478         /* cf. IEEE 802.11 9.2.12 */
479         for (i = 0; i < bss->supp_rates_len; i++)
480                 if ((bss->supp_rates[i] & 0x7f) * 5 > 110)
481                         have_higher_than_11mbit = 1;
482
483         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
484             have_higher_than_11mbit)
485                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
486         else
487                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
488
489         ieee80211_set_wmm_default(sdata);
490 }
491
492 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
493                                      struct ieee80211_if_sta *ifsta,
494                                      u8 *wmm_param, size_t wmm_param_len)
495 {
496         struct ieee80211_tx_queue_params params;
497         size_t left;
498         int count;
499         u8 *pos;
500
501         if (!(ifsta->flags & IEEE80211_STA_WMM_ENABLED))
502                 return;
503
504         if (!wmm_param)
505                 return;
506
507         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
508                 return;
509         count = wmm_param[6] & 0x0f;
510         if (count == ifsta->wmm_last_param_set)
511                 return;
512         ifsta->wmm_last_param_set = count;
513
514         pos = wmm_param + 8;
515         left = wmm_param_len - 8;
516
517         memset(&params, 0, sizeof(params));
518
519         if (!local->ops->conf_tx)
520                 return;
521
522         local->wmm_acm = 0;
523         for (; left >= 4; left -= 4, pos += 4) {
524                 int aci = (pos[0] >> 5) & 0x03;
525                 int acm = (pos[0] >> 4) & 0x01;
526                 int queue;
527
528                 switch (aci) {
529                 case 1:
530                         queue = 3;
531                         if (acm)
532                                 local->wmm_acm |= BIT(0) | BIT(3);
533                         break;
534                 case 2:
535                         queue = 1;
536                         if (acm)
537                                 local->wmm_acm |= BIT(4) | BIT(5);
538                         break;
539                 case 3:
540                         queue = 0;
541                         if (acm)
542                                 local->wmm_acm |= BIT(6) | BIT(7);
543                         break;
544                 case 0:
545                 default:
546                         queue = 2;
547                         if (acm)
548                                 local->wmm_acm |= BIT(1) | BIT(2);
549                         break;
550                 }
551
552                 params.aifs = pos[0] & 0x0f;
553                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
554                 params.cw_min = ecw2cw(pos[1] & 0x0f);
555                 params.txop = get_unaligned_le16(pos + 2);
556 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
557                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
558                        "cWmin=%d cWmax=%d txop=%d\n",
559                        local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
560                        params.cw_max, params.txop);
561 #endif
562                 /* TODO: handle ACM (block TX, fallback to next lowest allowed
563                  * AC for now) */
564                 if (local->ops->conf_tx(local_to_hw(local), queue, &params)) {
565                         printk(KERN_DEBUG "%s: failed to set TX queue "
566                                "parameters for queue %d\n", local->mdev->name, queue);
567                 }
568         }
569 }
570
571 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
572                                            u16 capab, bool erp_valid, u8 erp)
573 {
574         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
575 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
576         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
577 #endif
578         u32 changed = 0;
579         bool use_protection;
580         bool use_short_preamble;
581         bool use_short_slot;
582
583         if (erp_valid) {
584                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
585                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
586         } else {
587                 use_protection = false;
588                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
589         }
590
591         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
592
593         if (use_protection != bss_conf->use_cts_prot) {
594 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
595                 if (net_ratelimit()) {
596                         printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
597                                sdata->dev->name,
598                                use_protection ? "enabled" : "disabled",
599                                ifsta->bssid);
600                 }
601 #endif
602                 bss_conf->use_cts_prot = use_protection;
603                 changed |= BSS_CHANGED_ERP_CTS_PROT;
604         }
605
606         if (use_short_preamble != bss_conf->use_short_preamble) {
607 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
608                 if (net_ratelimit()) {
609                         printk(KERN_DEBUG "%s: switched to %s barker preamble"
610                                " (BSSID=%pM)\n",
611                                sdata->dev->name,
612                                use_short_preamble ? "short" : "long",
613                                ifsta->bssid);
614                 }
615 #endif
616                 bss_conf->use_short_preamble = use_short_preamble;
617                 changed |= BSS_CHANGED_ERP_PREAMBLE;
618         }
619
620         if (use_short_slot != bss_conf->use_short_slot) {
621 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
622                 if (net_ratelimit()) {
623                         printk(KERN_DEBUG "%s: switched to %s slot"
624                                " (BSSID=%s)\n",
625                                sdata->dev->name,
626                                use_short_slot ? "short" : "long",
627                                ifsta->bssid);
628                 }
629 #endif
630                 bss_conf->use_short_slot = use_short_slot;
631                 changed |= BSS_CHANGED_ERP_SLOT;
632         }
633
634         return changed;
635 }
636
637 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata,
638                                         struct ieee80211_if_sta *ifsta)
639 {
640         union iwreq_data wrqu;
641         memset(&wrqu, 0, sizeof(wrqu));
642         if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
643                 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
644         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
645         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
646 }
647
648 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata,
649                                          struct ieee80211_if_sta *ifsta)
650 {
651         char *buf;
652         size_t len;
653         int i;
654         union iwreq_data wrqu;
655
656         if (!ifsta->assocreq_ies && !ifsta->assocresp_ies)
657                 return;
658
659         buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len +
660                                 ifsta->assocresp_ies_len), GFP_KERNEL);
661         if (!buf)
662                 return;
663
664         len = sprintf(buf, "ASSOCINFO(");
665         if (ifsta->assocreq_ies) {
666                 len += sprintf(buf + len, "ReqIEs=");
667                 for (i = 0; i < ifsta->assocreq_ies_len; i++) {
668                         len += sprintf(buf + len, "%02x",
669                                        ifsta->assocreq_ies[i]);
670                 }
671         }
672         if (ifsta->assocresp_ies) {
673                 if (ifsta->assocreq_ies)
674                         len += sprintf(buf + len, " ");
675                 len += sprintf(buf + len, "RespIEs=");
676                 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
677                         len += sprintf(buf + len, "%02x",
678                                        ifsta->assocresp_ies[i]);
679                 }
680         }
681         len += sprintf(buf + len, ")");
682
683         if (len > IW_CUSTOM_MAX) {
684                 len = sprintf(buf, "ASSOCRESPIE=");
685                 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
686                         len += sprintf(buf + len, "%02x",
687                                        ifsta->assocresp_ies[i]);
688                 }
689         }
690
691         if (len <= IW_CUSTOM_MAX) {
692                 memset(&wrqu, 0, sizeof(wrqu));
693                 wrqu.data.length = len;
694                 wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
695         }
696
697         kfree(buf);
698 }
699
700
701 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
702                                      struct ieee80211_if_sta *ifsta,
703                                      u32 bss_info_changed)
704 {
705         struct ieee80211_local *local = sdata->local;
706         struct ieee80211_conf *conf = &local_to_hw(local)->conf;
707
708         struct ieee80211_bss *bss;
709
710         bss_info_changed |= BSS_CHANGED_ASSOC;
711         ifsta->flags |= IEEE80211_STA_ASSOCIATED;
712
713         if (sdata->vif.type != NL80211_IFTYPE_STATION)
714                 return;
715
716         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
717                                    conf->channel->center_freq,
718                                    ifsta->ssid, ifsta->ssid_len);
719         if (bss) {
720                 /* set timing information */
721                 sdata->vif.bss_conf.beacon_int = bss->beacon_int;
722                 sdata->vif.bss_conf.timestamp = bss->timestamp;
723                 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
724
725                 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
726                         bss->capability, bss->has_erp_value, bss->erp_value);
727
728                 ieee80211_rx_bss_put(local, bss);
729         }
730
731         ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
732         memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
733         ieee80211_sta_send_associnfo(sdata, ifsta);
734
735         ifsta->last_probe = jiffies;
736         ieee80211_led_assoc(local, 1);
737
738         sdata->vif.bss_conf.assoc = 1;
739         /*
740          * For now just always ask the driver to update the basic rateset
741          * when we have associated, we aren't checking whether it actually
742          * changed or not.
743          */
744         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
745         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
746
747         netif_tx_start_all_queues(sdata->dev);
748         netif_carrier_on(sdata->dev);
749
750         ieee80211_sta_send_apinfo(sdata, ifsta);
751 }
752
753 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
754                                    struct ieee80211_if_sta *ifsta)
755 {
756         ifsta->direct_probe_tries++;
757         if (ifsta->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
758                 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
759                        sdata->dev->name, ifsta->bssid);
760                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
761                 ieee80211_sta_send_apinfo(sdata, ifsta);
762                 return;
763         }
764
765         printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
766                         sdata->dev->name, ifsta->bssid,
767                         ifsta->direct_probe_tries);
768
769         ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
770
771         set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifsta->request);
772
773         /* Direct probe is sent to broadcast address as some APs
774          * will not answer to direct packet in unassociated state.
775          */
776         ieee80211_send_probe_req(sdata, NULL,
777                                  ifsta->ssid, ifsta->ssid_len);
778
779         mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
780 }
781
782
783 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
784                                    struct ieee80211_if_sta *ifsta)
785 {
786         ifsta->auth_tries++;
787         if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
788                 printk(KERN_DEBUG "%s: authentication with AP %pM"
789                        " timed out\n",
790                        sdata->dev->name, ifsta->bssid);
791                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
792                 ieee80211_sta_send_apinfo(sdata, ifsta);
793                 return;
794         }
795
796         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
797         printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
798                sdata->dev->name, ifsta->bssid);
799
800         ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0);
801
802         mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
803 }
804
805 /*
806  * The disassoc 'reason' argument can be either our own reason
807  * if self disconnected or a reason code from the AP.
808  */
809 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
810                                    struct ieee80211_if_sta *ifsta, bool deauth,
811                                    bool self_disconnected, u16 reason)
812 {
813         struct ieee80211_local *local = sdata->local;
814         struct sta_info *sta;
815         u32 changed = 0;
816
817         rcu_read_lock();
818
819         sta = sta_info_get(local, ifsta->bssid);
820         if (!sta) {
821                 rcu_read_unlock();
822                 return;
823         }
824
825         if (deauth) {
826                 ifsta->direct_probe_tries = 0;
827                 ifsta->auth_tries = 0;
828         }
829         ifsta->assoc_scan_tries = 0;
830         ifsta->assoc_tries = 0;
831
832         netif_tx_stop_all_queues(sdata->dev);
833         netif_carrier_off(sdata->dev);
834
835         ieee80211_sta_tear_down_BA_sessions(sdata, sta->sta.addr);
836
837         if (self_disconnected) {
838                 if (deauth)
839                         ieee80211_send_deauth_disassoc(sdata,
840                                 IEEE80211_STYPE_DEAUTH, reason);
841                 else
842                         ieee80211_send_deauth_disassoc(sdata,
843                                 IEEE80211_STYPE_DISASSOC, reason);
844         }
845
846         ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
847         changed |= ieee80211_reset_erp_info(sdata);
848
849         ieee80211_led_assoc(local, 0);
850         changed |= BSS_CHANGED_ASSOC;
851         sdata->vif.bss_conf.assoc = false;
852
853         ieee80211_sta_send_apinfo(sdata, ifsta);
854
855         if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT)
856                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
857
858         rcu_read_unlock();
859
860         local->hw.conf.ht.enabled = false;
861         local->oper_channel_type = NL80211_CHAN_NO_HT;
862         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_HT);
863
864         ieee80211_bss_info_change_notify(sdata, changed);
865
866         rcu_read_lock();
867
868         sta = sta_info_get(local, ifsta->bssid);
869         if (!sta) {
870                 rcu_read_unlock();
871                 return;
872         }
873
874         sta_info_unlink(&sta);
875
876         rcu_read_unlock();
877
878         sta_info_destroy(sta);
879 }
880
881 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
882 {
883         if (!sdata || !sdata->default_key ||
884             sdata->default_key->conf.alg != ALG_WEP)
885                 return 0;
886         return 1;
887 }
888
889 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
890                                       struct ieee80211_if_sta *ifsta)
891 {
892         struct ieee80211_local *local = sdata->local;
893         struct ieee80211_bss *bss;
894         int bss_privacy;
895         int wep_privacy;
896         int privacy_invoked;
897
898         if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
899                 return 0;
900
901         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
902                                    local->hw.conf.channel->center_freq,
903                                    ifsta->ssid, ifsta->ssid_len);
904         if (!bss)
905                 return 0;
906
907         bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
908         wep_privacy = !!ieee80211_sta_wep_configured(sdata);
909         privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
910
911         ieee80211_rx_bss_put(local, bss);
912
913         if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
914                 return 0;
915
916         return 1;
917 }
918
919 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
920                                 struct ieee80211_if_sta *ifsta)
921 {
922         ifsta->assoc_tries++;
923         if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
924                 printk(KERN_DEBUG "%s: association with AP %pM"
925                        " timed out\n",
926                        sdata->dev->name, ifsta->bssid);
927                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
928                 ieee80211_sta_send_apinfo(sdata, ifsta);
929                 return;
930         }
931
932         ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
933         printk(KERN_DEBUG "%s: associate with AP %pM\n",
934                sdata->dev->name, ifsta->bssid);
935         if (ieee80211_privacy_mismatch(sdata, ifsta)) {
936                 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
937                        "mixed-cell disabled - abort association\n", sdata->dev->name);
938                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
939                 return;
940         }
941
942         ieee80211_send_assoc(sdata, ifsta);
943
944         mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
945 }
946
947
948 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
949                                  struct ieee80211_if_sta *ifsta)
950 {
951         struct ieee80211_local *local = sdata->local;
952         struct sta_info *sta;
953         int disassoc;
954
955         /* TODO: start monitoring current AP signal quality and number of
956          * missed beacons. Scan other channels every now and then and search
957          * for better APs. */
958         /* TODO: remove expired BSSes */
959
960         ifsta->state = IEEE80211_STA_MLME_ASSOCIATED;
961
962         rcu_read_lock();
963
964         sta = sta_info_get(local, ifsta->bssid);
965         if (!sta) {
966                 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
967                        sdata->dev->name, ifsta->bssid);
968                 disassoc = 1;
969         } else {
970                 disassoc = 0;
971                 if (time_after(jiffies,
972                                sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
973                         if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
974                                 printk(KERN_DEBUG "%s: No ProbeResp from "
975                                        "current AP %pM - assume out of "
976                                        "range\n",
977                                        sdata->dev->name, ifsta->bssid);
978                                 disassoc = 1;
979                         } else
980                                 ieee80211_send_probe_req(sdata, ifsta->bssid,
981                                                          ifsta->ssid,
982                                                          ifsta->ssid_len);
983                         ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
984                 } else {
985                         ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
986                         if (time_after(jiffies, ifsta->last_probe +
987                                        IEEE80211_PROBE_INTERVAL)) {
988                                 ifsta->last_probe = jiffies;
989                                 ieee80211_send_probe_req(sdata, ifsta->bssid,
990                                                          ifsta->ssid,
991                                                          ifsta->ssid_len);
992                         }
993                 }
994         }
995
996         rcu_read_unlock();
997
998         if (disassoc)
999                 ieee80211_set_disassoc(sdata, ifsta, true, true,
1000                                         WLAN_REASON_PREV_AUTH_NOT_VALID);
1001         else
1002                 mod_timer(&ifsta->timer, jiffies +
1003                                       IEEE80211_MONITORING_INTERVAL);
1004 }
1005
1006
1007 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1008                                      struct ieee80211_if_sta *ifsta)
1009 {
1010         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1011         ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
1012         ieee80211_associate(sdata, ifsta);
1013 }
1014
1015
1016 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1017                                      struct ieee80211_if_sta *ifsta,
1018                                      struct ieee80211_mgmt *mgmt,
1019                                      size_t len)
1020 {
1021         u8 *pos;
1022         struct ieee802_11_elems elems;
1023
1024         pos = mgmt->u.auth.variable;
1025         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1026         if (!elems.challenge)
1027                 return;
1028         ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2,
1029                             elems.challenge_len + 2, 1);
1030 }
1031
1032 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1033                                    struct ieee80211_if_sta *ifsta,
1034                                    struct ieee80211_mgmt *mgmt,
1035                                    size_t len)
1036 {
1037         u16 auth_alg, auth_transaction, status_code;
1038
1039         if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1040             sdata->vif.type != NL80211_IFTYPE_ADHOC)
1041                 return;
1042
1043         if (len < 24 + 6)
1044                 return;
1045
1046         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1047             memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1048                 return;
1049
1050         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1051             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1052                 return;
1053
1054         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1055         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1056         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1057
1058         if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1059                 /*
1060                  * IEEE 802.11 standard does not require authentication in IBSS
1061                  * networks and most implementations do not seem to use it.
1062                  * However, try to reply to authentication attempts if someone
1063                  * has actually implemented this.
1064                  */
1065                 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1066                         return;
1067                 ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0);
1068         }
1069
1070         if (auth_alg != ifsta->auth_alg ||
1071             auth_transaction != ifsta->auth_transaction)
1072                 return;
1073
1074         if (status_code != WLAN_STATUS_SUCCESS) {
1075                 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1076                         u8 algs[3];
1077                         const int num_algs = ARRAY_SIZE(algs);
1078                         int i, pos;
1079                         algs[0] = algs[1] = algs[2] = 0xff;
1080                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1081                                 algs[0] = WLAN_AUTH_OPEN;
1082                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1083                                 algs[1] = WLAN_AUTH_SHARED_KEY;
1084                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1085                                 algs[2] = WLAN_AUTH_LEAP;
1086                         if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1087                                 pos = 0;
1088                         else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1089                                 pos = 1;
1090                         else
1091                                 pos = 2;
1092                         for (i = 0; i < num_algs; i++) {
1093                                 pos++;
1094                                 if (pos >= num_algs)
1095                                         pos = 0;
1096                                 if (algs[pos] == ifsta->auth_alg ||
1097                                     algs[pos] == 0xff)
1098                                         continue;
1099                                 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1100                                     !ieee80211_sta_wep_configured(sdata))
1101                                         continue;
1102                                 ifsta->auth_alg = algs[pos];
1103                                 break;
1104                         }
1105                 }
1106                 return;
1107         }
1108
1109         switch (ifsta->auth_alg) {
1110         case WLAN_AUTH_OPEN:
1111         case WLAN_AUTH_LEAP:
1112                 ieee80211_auth_completed(sdata, ifsta);
1113                 break;
1114         case WLAN_AUTH_SHARED_KEY:
1115                 if (ifsta->auth_transaction == 4)
1116                         ieee80211_auth_completed(sdata, ifsta);
1117                 else
1118                         ieee80211_auth_challenge(sdata, ifsta, mgmt, len);
1119                 break;
1120         }
1121 }
1122
1123
1124 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1125                                      struct ieee80211_if_sta *ifsta,
1126                                      struct ieee80211_mgmt *mgmt,
1127                                      size_t len)
1128 {
1129         u16 reason_code;
1130
1131         if (len < 24 + 2)
1132                 return;
1133
1134         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1135                 return;
1136
1137         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1138
1139         if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
1140                 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
1141                                 sdata->dev->name, reason_code);
1142
1143         if (ifsta->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1144             ifsta->state == IEEE80211_STA_MLME_ASSOCIATE ||
1145             ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1146                 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1147                 mod_timer(&ifsta->timer, jiffies +
1148                                       IEEE80211_RETRY_AUTH_INTERVAL);
1149         }
1150
1151         ieee80211_set_disassoc(sdata, ifsta, true, false, 0);
1152         ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1153 }
1154
1155
1156 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1157                                        struct ieee80211_if_sta *ifsta,
1158                                        struct ieee80211_mgmt *mgmt,
1159                                        size_t len)
1160 {
1161         u16 reason_code;
1162
1163         if (len < 24 + 2)
1164                 return;
1165
1166         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1167                 return;
1168
1169         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1170
1171         if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1172                 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1173                                 sdata->dev->name, reason_code);
1174
1175         if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1176                 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1177                 mod_timer(&ifsta->timer, jiffies +
1178                                       IEEE80211_RETRY_AUTH_INTERVAL);
1179         }
1180
1181         ieee80211_set_disassoc(sdata, ifsta, false, false, reason_code);
1182 }
1183
1184
1185 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1186                                          struct ieee80211_if_sta *ifsta,
1187                                          struct ieee80211_mgmt *mgmt,
1188                                          size_t len,
1189                                          int reassoc)
1190 {
1191         struct ieee80211_local *local = sdata->local;
1192         struct ieee80211_supported_band *sband;
1193         struct sta_info *sta;
1194         u64 rates, basic_rates;
1195         u16 capab_info, status_code, aid;
1196         struct ieee802_11_elems elems;
1197         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1198         u8 *pos;
1199         u32 changed = 0;
1200         int i, j;
1201         bool have_higher_than_11mbit = false, newsta = false;
1202         u16 ap_ht_cap_flags;
1203
1204         /* AssocResp and ReassocResp have identical structure, so process both
1205          * of them in this function. */
1206
1207         if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATE)
1208                 return;
1209
1210         if (len < 24 + 6)
1211                 return;
1212
1213         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1214                 return;
1215
1216         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1217         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1218         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1219
1220         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1221                "status=%d aid=%d)\n",
1222                sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1223                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1224
1225         if (status_code != WLAN_STATUS_SUCCESS) {
1226                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1227                        sdata->dev->name, status_code);
1228                 /* if this was a reassociation, ensure we try a "full"
1229                  * association next time. This works around some broken APs
1230                  * which do not correctly reject reassociation requests. */
1231                 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1232                 return;
1233         }
1234
1235         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1236                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1237                        "set\n", sdata->dev->name, aid);
1238         aid &= ~(BIT(15) | BIT(14));
1239
1240         pos = mgmt->u.assoc_resp.variable;
1241         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1242
1243         if (!elems.supp_rates) {
1244                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1245                        sdata->dev->name);
1246                 return;
1247         }
1248
1249         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1250         ifsta->aid = aid;
1251         ifsta->ap_capab = capab_info;
1252
1253         kfree(ifsta->assocresp_ies);
1254         ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1255         ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
1256         if (ifsta->assocresp_ies)
1257                 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
1258
1259         rcu_read_lock();
1260
1261         /* Add STA entry for the AP */
1262         sta = sta_info_get(local, ifsta->bssid);
1263         if (!sta) {
1264                 struct ieee80211_bss *bss;
1265
1266                 newsta = true;
1267
1268                 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
1269                 if (!sta) {
1270                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1271                                " the AP\n", sdata->dev->name);
1272                         rcu_read_unlock();
1273                         return;
1274                 }
1275                 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
1276                                            local->hw.conf.channel->center_freq,
1277                                            ifsta->ssid, ifsta->ssid_len);
1278                 if (bss) {
1279                         sta->last_signal = bss->signal;
1280                         sta->last_qual = bss->qual;
1281                         sta->last_noise = bss->noise;
1282                         ieee80211_rx_bss_put(local, bss);
1283                 }
1284
1285                 /* update new sta with its last rx activity */
1286                 sta->last_rx = jiffies;
1287         }
1288
1289         /*
1290          * FIXME: Do we really need to update the sta_info's information here?
1291          *        We already know about the AP (we found it in our list) so it
1292          *        should already be filled with the right info, no?
1293          *        As is stands, all this is racy because typically we assume
1294          *        the information that is filled in here (except flags) doesn't
1295          *        change while a STA structure is alive. As such, it should move
1296          *        to between the sta_info_alloc() and sta_info_insert() above.
1297          */
1298
1299         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1300                            WLAN_STA_AUTHORIZED);
1301
1302         rates = 0;
1303         basic_rates = 0;
1304         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1305
1306         for (i = 0; i < elems.supp_rates_len; i++) {
1307                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1308                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1309
1310                 if (rate > 110)
1311                         have_higher_than_11mbit = true;
1312
1313                 for (j = 0; j < sband->n_bitrates; j++) {
1314                         if (sband->bitrates[j].bitrate == rate) {
1315                                 rates |= BIT(j);
1316                                 if (is_basic)
1317                                         basic_rates |= BIT(j);
1318                                 break;
1319                         }
1320                 }
1321         }
1322
1323         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1324                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1325                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1326
1327                 if (rate > 110)
1328                         have_higher_than_11mbit = true;
1329
1330                 for (j = 0; j < sband->n_bitrates; j++) {
1331                         if (sband->bitrates[j].bitrate == rate) {
1332                                 rates |= BIT(j);
1333                                 if (is_basic)
1334                                         basic_rates |= BIT(j);
1335                                 break;
1336                         }
1337                 }
1338         }
1339
1340         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1341         sdata->vif.bss_conf.basic_rates = basic_rates;
1342
1343         /* cf. IEEE 802.11 9.2.12 */
1344         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1345             have_higher_than_11mbit)
1346                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1347         else
1348                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1349
1350         if (elems.ht_cap_elem)
1351                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1352                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1353
1354         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1355
1356         rate_control_rate_init(sta);
1357
1358         if (elems.wmm_param)
1359                 set_sta_flags(sta, WLAN_STA_WME);
1360
1361         if (newsta) {
1362                 int err = sta_info_insert(sta);
1363                 if (err) {
1364                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1365                                " the AP (error %d)\n", sdata->dev->name, err);
1366                         rcu_read_unlock();
1367                         return;
1368                 }
1369         }
1370
1371         rcu_read_unlock();
1372
1373         if (elems.wmm_param)
1374                 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1375                                          elems.wmm_param_len);
1376
1377         if (elems.ht_info_elem && elems.wmm_param &&
1378             (ifsta->flags & IEEE80211_STA_WMM_ENABLED))
1379                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1380                                                ap_ht_cap_flags);
1381
1382         /* set AID and assoc capability,
1383          * ieee80211_set_associated() will tell the driver */
1384         bss_conf->aid = aid;
1385         bss_conf->assoc_capability = capab_info;
1386         ieee80211_set_associated(sdata, ifsta, changed);
1387
1388         ieee80211_associated(sdata, ifsta);
1389 }
1390
1391
1392 static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
1393                                    struct ieee80211_if_sta *ifsta,
1394                                    struct ieee80211_bss *bss)
1395 {
1396         struct ieee80211_local *local = sdata->local;
1397         int res, rates, i, j;
1398         struct sk_buff *skb;
1399         struct ieee80211_mgmt *mgmt;
1400         u8 *pos;
1401         struct ieee80211_supported_band *sband;
1402         union iwreq_data wrqu;
1403
1404         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
1405         if (!skb) {
1406                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
1407                        "response\n", sdata->dev->name);
1408                 return -ENOMEM;
1409         }
1410
1411         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1412
1413         /* Remove possible STA entries from other IBSS networks. */
1414         sta_info_flush_delayed(sdata);
1415
1416         if (local->ops->reset_tsf) {
1417                 /* Reset own TSF to allow time synchronization work. */
1418                 local->ops->reset_tsf(local_to_hw(local));
1419         }
1420         memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
1421         res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
1422         if (res)
1423                 return res;
1424
1425         local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
1426
1427         sdata->drop_unencrypted = bss->capability &
1428                 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
1429
1430         res = ieee80211_set_freq(sdata, bss->freq);
1431
1432         if (res)
1433                 return res;
1434
1435         /* Build IBSS probe response */
1436
1437         skb_reserve(skb, local->hw.extra_tx_headroom);
1438
1439         mgmt = (struct ieee80211_mgmt *)
1440                 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1441         memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1442         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1443                                                 IEEE80211_STYPE_PROBE_RESP);
1444         memset(mgmt->da, 0xff, ETH_ALEN);
1445         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1446         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1447         mgmt->u.beacon.beacon_int =
1448                 cpu_to_le16(local->hw.conf.beacon_int);
1449         mgmt->u.beacon.timestamp = cpu_to_le64(bss->timestamp);
1450         mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
1451
1452         pos = skb_put(skb, 2 + ifsta->ssid_len);
1453         *pos++ = WLAN_EID_SSID;
1454         *pos++ = ifsta->ssid_len;
1455         memcpy(pos, ifsta->ssid, ifsta->ssid_len);
1456
1457         rates = bss->supp_rates_len;
1458         if (rates > 8)
1459                 rates = 8;
1460         pos = skb_put(skb, 2 + rates);
1461         *pos++ = WLAN_EID_SUPP_RATES;
1462         *pos++ = rates;
1463         memcpy(pos, bss->supp_rates, rates);
1464
1465         if (bss->band == IEEE80211_BAND_2GHZ) {
1466                 pos = skb_put(skb, 2 + 1);
1467                 *pos++ = WLAN_EID_DS_PARAMS;
1468                 *pos++ = 1;
1469                 *pos++ = ieee80211_frequency_to_channel(bss->freq);
1470         }
1471
1472         pos = skb_put(skb, 2 + 2);
1473         *pos++ = WLAN_EID_IBSS_PARAMS;
1474         *pos++ = 2;
1475         /* FIX: set ATIM window based on scan results */
1476         *pos++ = 0;
1477         *pos++ = 0;
1478
1479         if (bss->supp_rates_len > 8) {
1480                 rates = bss->supp_rates_len - 8;
1481                 pos = skb_put(skb, 2 + rates);
1482                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1483                 *pos++ = rates;
1484                 memcpy(pos, &bss->supp_rates[8], rates);
1485         }
1486
1487         ifsta->probe_resp = skb;
1488
1489         ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
1490
1491
1492         rates = 0;
1493         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1494         for (i = 0; i < bss->supp_rates_len; i++) {
1495                 int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
1496                 for (j = 0; j < sband->n_bitrates; j++)
1497                         if (sband->bitrates[j].bitrate == bitrate)
1498                                 rates |= BIT(j);
1499         }
1500         ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
1501
1502         ieee80211_sta_def_wmm_params(sdata, bss);
1503
1504         ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED;
1505         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1506
1507         ieee80211_led_assoc(local, true);
1508
1509         memset(&wrqu, 0, sizeof(wrqu));
1510         memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
1511         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
1512
1513         return res;
1514 }
1515
1516 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1517                                   struct ieee80211_mgmt *mgmt,
1518                                   size_t len,
1519                                   struct ieee80211_rx_status *rx_status,
1520                                   struct ieee802_11_elems *elems,
1521                                   bool beacon)
1522 {
1523         struct ieee80211_local *local = sdata->local;
1524         int freq;
1525         struct ieee80211_bss *bss;
1526         struct sta_info *sta;
1527         struct ieee80211_channel *channel;
1528         u64 beacon_timestamp, rx_timestamp;
1529         u64 supp_rates = 0;
1530         enum ieee80211_band band = rx_status->band;
1531
1532         if (elems->ds_params && elems->ds_params_len == 1)
1533                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1534         else
1535                 freq = rx_status->freq;
1536
1537         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1538
1539         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1540                 return;
1541
1542         if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
1543             memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
1544                 supp_rates = ieee80211_sta_get_rates(local, elems, band);
1545
1546                 rcu_read_lock();
1547
1548                 sta = sta_info_get(local, mgmt->sa);
1549                 if (sta) {
1550                         u64 prev_rates;
1551
1552                         prev_rates = sta->sta.supp_rates[band];
1553                         /* make sure mandatory rates are always added */
1554                         sta->sta.supp_rates[band] = supp_rates |
1555                                 ieee80211_mandatory_rates(local, band);
1556
1557 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1558                         if (sta->sta.supp_rates[band] != prev_rates)
1559                                 printk(KERN_DEBUG "%s: updated supp_rates set "
1560                                     "for %pM based on beacon info (0x%llx | "
1561                                     "0x%llx -> 0x%llx)\n",
1562                                     sdata->dev->name,
1563                                     sta->sta.addr,
1564                                     (unsigned long long) prev_rates,
1565                                     (unsigned long long) supp_rates,
1566                                     (unsigned long long) sta->sta.supp_rates[band]);
1567 #endif
1568                 } else {
1569                         ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1570                 }
1571
1572                 rcu_read_unlock();
1573         }
1574
1575         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1576                                         freq, beacon);
1577         if (!bss)
1578                 return;
1579
1580         /* was just updated in ieee80211_bss_info_update */
1581         beacon_timestamp = bss->timestamp;
1582
1583         /*
1584          * In STA mode, the remaining parameters should not be overridden
1585          * by beacons because they're not necessarily accurate there.
1586          */
1587         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1588             bss->last_probe_resp && beacon) {
1589                 ieee80211_rx_bss_put(local, bss);
1590                 return;
1591         }
1592
1593         /* check if we need to merge IBSS */
1594         if (sdata->vif.type == NL80211_IFTYPE_ADHOC && beacon &&
1595             bss->capability & WLAN_CAPABILITY_IBSS &&
1596             bss->freq == local->oper_channel->center_freq &&
1597             elems->ssid_len == sdata->u.sta.ssid_len &&
1598             memcmp(elems->ssid, sdata->u.sta.ssid,
1599                                 sdata->u.sta.ssid_len) == 0) {
1600                 if (rx_status->flag & RX_FLAG_TSFT) {
1601                         /* in order for correct IBSS merging we need mactime
1602                          *
1603                          * since mactime is defined as the time the first data
1604                          * symbol of the frame hits the PHY, and the timestamp
1605                          * of the beacon is defined as "the time that the data
1606                          * symbol containing the first bit of the timestamp is
1607                          * transmitted to the PHY plus the transmitting STA’s
1608                          * delays through its local PHY from the MAC-PHY
1609                          * interface to its interface with the WM"
1610                          * (802.11 11.1.2) - equals the time this bit arrives at
1611                          * the receiver - we have to take into account the
1612                          * offset between the two.
1613                          * e.g: at 1 MBit that means mactime is 192 usec earlier
1614                          * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
1615                          */
1616                         int rate = local->hw.wiphy->bands[band]->
1617                                         bitrates[rx_status->rate_idx].bitrate;
1618                         rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
1619                 } else if (local && local->ops && local->ops->get_tsf)
1620                         /* second best option: get current TSF */
1621                         rx_timestamp = local->ops->get_tsf(local_to_hw(local));
1622                 else
1623                         /* can't merge without knowing the TSF */
1624                         rx_timestamp = -1LLU;
1625 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1626                 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
1627                        "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1628                        mgmt->sa, mgmt->bssid,
1629                        (unsigned long long)rx_timestamp,
1630                        (unsigned long long)beacon_timestamp,
1631                        (unsigned long long)(rx_timestamp - beacon_timestamp),
1632                        jiffies);
1633 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1634                 if (beacon_timestamp > rx_timestamp) {
1635 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1636                         printk(KERN_DEBUG "%s: beacon TSF higher than "
1637                                "local TSF - IBSS merge with BSSID %pM\n",
1638                                sdata->dev->name, mgmt->bssid);
1639 #endif
1640                         ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss);
1641                         ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1642                 }
1643         }
1644
1645         ieee80211_rx_bss_put(local, bss);
1646 }
1647
1648
1649 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1650                                          struct ieee80211_mgmt *mgmt,
1651                                          size_t len,
1652                                          struct ieee80211_rx_status *rx_status)
1653 {
1654         size_t baselen;
1655         struct ieee802_11_elems elems;
1656         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1657
1658         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1659                 return; /* ignore ProbeResp to foreign address */
1660
1661         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1662         if (baselen > len)
1663                 return;
1664
1665         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1666                                 &elems);
1667
1668         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1669
1670         /* direct probe may be part of the association flow */
1671         if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1672                                                         &ifsta->request)) {
1673                 printk(KERN_DEBUG "%s direct probe responded\n",
1674                        sdata->dev->name);
1675                 ieee80211_authenticate(sdata, ifsta);
1676         }
1677 }
1678
1679
1680 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1681                                      struct ieee80211_mgmt *mgmt,
1682                                      size_t len,
1683                                      struct ieee80211_rx_status *rx_status)
1684 {
1685         struct ieee80211_if_sta *ifsta;
1686         size_t baselen;
1687         struct ieee802_11_elems elems;
1688         struct ieee80211_local *local = sdata->local;
1689         u32 changed = 0;
1690         bool erp_valid;
1691         u8 erp_value = 0;
1692
1693         /* Process beacon from the current BSS */
1694         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1695         if (baselen > len)
1696                 return;
1697
1698         ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1699
1700         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1701
1702         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1703                 return;
1704         ifsta = &sdata->u.sta;
1705
1706         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
1707             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1708                 return;
1709
1710         ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1711                                  elems.wmm_param_len);
1712
1713
1714         if (elems.erp_info && elems.erp_info_len >= 1) {
1715                 erp_valid = true;
1716                 erp_value = elems.erp_info[0];
1717         } else {
1718                 erp_valid = false;
1719         }
1720         changed |= ieee80211_handle_bss_capability(sdata,
1721                         le16_to_cpu(mgmt->u.beacon.capab_info),
1722                         erp_valid, erp_value);
1723
1724
1725         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param) {
1726                 struct sta_info *sta;
1727                 struct ieee80211_supported_band *sband;
1728                 u16 ap_ht_cap_flags;
1729
1730                 rcu_read_lock();
1731
1732                 sta = sta_info_get(local, ifsta->bssid);
1733                 if (!sta) {
1734                         rcu_read_unlock();
1735                         return;
1736                 }
1737
1738                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1739
1740                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1741                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1742
1743                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1744
1745                 rcu_read_unlock();
1746
1747                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1748                                                ap_ht_cap_flags);
1749         }
1750
1751         if (elems.country_elem) {
1752                 /* Note we are only reviewing this on beacons
1753                  * for the BSSID we are associated to */
1754                 regulatory_hint_11d(local->hw.wiphy,
1755                         elems.country_elem, elems.country_elem_len);
1756         }
1757
1758         ieee80211_bss_info_change_notify(sdata, changed);
1759 }
1760
1761
1762 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1763                                         struct ieee80211_if_sta *ifsta,
1764                                         struct ieee80211_mgmt *mgmt,
1765                                         size_t len,
1766                                         struct ieee80211_rx_status *rx_status)
1767 {
1768         struct ieee80211_local *local = sdata->local;
1769         int tx_last_beacon;
1770         struct sk_buff *skb;
1771         struct ieee80211_mgmt *resp;
1772         u8 *pos, *end;
1773
1774         if (sdata->vif.type != NL80211_IFTYPE_ADHOC ||
1775             ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED ||
1776             len < 24 + 2 || !ifsta->probe_resp)
1777                 return;
1778
1779         if (local->ops->tx_last_beacon)
1780                 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
1781         else
1782                 tx_last_beacon = 1;
1783
1784 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1785         printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
1786                " (tx_last_beacon=%d)\n",
1787                sdata->dev->name, mgmt->sa, mgmt->da,
1788                mgmt->bssid, tx_last_beacon);
1789 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1790
1791         if (!tx_last_beacon)
1792                 return;
1793
1794         if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
1795             memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
1796                 return;
1797
1798         end = ((u8 *) mgmt) + len;
1799         pos = mgmt->u.probe_req.variable;
1800         if (pos[0] != WLAN_EID_SSID ||
1801             pos + 2 + pos[1] > end) {
1802 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1803                 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
1804                        "from %pM\n",
1805                        sdata->dev->name, mgmt->sa);
1806 #endif
1807                 return;
1808         }
1809         if (pos[1] != 0 &&
1810             (pos[1] != ifsta->ssid_len ||
1811              memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
1812                 /* Ignore ProbeReq for foreign SSID */
1813                 return;
1814         }
1815
1816         /* Reply with ProbeResp */
1817         skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
1818         if (!skb)
1819                 return;
1820
1821         resp = (struct ieee80211_mgmt *) skb->data;
1822         memcpy(resp->da, mgmt->sa, ETH_ALEN);
1823 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1824         printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
1825                sdata->dev->name, resp->da);
1826 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1827         ieee80211_tx_skb(sdata, skb, 0);
1828 }
1829
1830 void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
1831                            struct ieee80211_rx_status *rx_status)
1832 {
1833         struct ieee80211_local *local = sdata->local;
1834         struct ieee80211_if_sta *ifsta;
1835         struct ieee80211_mgmt *mgmt;
1836         u16 fc;
1837
1838         if (skb->len < 24)
1839                 goto fail;
1840
1841         ifsta = &sdata->u.sta;
1842
1843         mgmt = (struct ieee80211_mgmt *) skb->data;
1844         fc = le16_to_cpu(mgmt->frame_control);
1845
1846         switch (fc & IEEE80211_FCTL_STYPE) {
1847         case IEEE80211_STYPE_PROBE_REQ:
1848         case IEEE80211_STYPE_PROBE_RESP:
1849         case IEEE80211_STYPE_BEACON:
1850                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1851         case IEEE80211_STYPE_AUTH:
1852         case IEEE80211_STYPE_ASSOC_RESP:
1853         case IEEE80211_STYPE_REASSOC_RESP:
1854         case IEEE80211_STYPE_DEAUTH:
1855         case IEEE80211_STYPE_DISASSOC:
1856                 skb_queue_tail(&ifsta->skb_queue, skb);
1857                 queue_work(local->hw.workqueue, &ifsta->work);
1858                 return;
1859         }
1860
1861  fail:
1862         kfree_skb(skb);
1863 }
1864
1865 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1866                                          struct sk_buff *skb)
1867 {
1868         struct ieee80211_rx_status *rx_status;
1869         struct ieee80211_if_sta *ifsta;
1870         struct ieee80211_mgmt *mgmt;
1871         u16 fc;
1872
1873         ifsta = &sdata->u.sta;
1874
1875         rx_status = (struct ieee80211_rx_status *) skb->cb;
1876         mgmt = (struct ieee80211_mgmt *) skb->data;
1877         fc = le16_to_cpu(mgmt->frame_control);
1878
1879         switch (fc & IEEE80211_FCTL_STYPE) {
1880         case IEEE80211_STYPE_PROBE_REQ:
1881                 ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len,
1882                                             rx_status);
1883                 break;
1884         case IEEE80211_STYPE_PROBE_RESP:
1885                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
1886                 break;
1887         case IEEE80211_STYPE_BEACON:
1888                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
1889                 break;
1890         case IEEE80211_STYPE_AUTH:
1891                 ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len);
1892                 break;
1893         case IEEE80211_STYPE_ASSOC_RESP:
1894                 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
1895                 break;
1896         case IEEE80211_STYPE_REASSOC_RESP:
1897                 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
1898                 break;
1899         case IEEE80211_STYPE_DEAUTH:
1900                 ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len);
1901                 break;
1902         case IEEE80211_STYPE_DISASSOC:
1903                 ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len);
1904                 break;
1905         }
1906
1907         kfree_skb(skb);
1908 }
1909
1910
1911 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
1912 {
1913         struct ieee80211_local *local = sdata->local;
1914         int active = 0;
1915         struct sta_info *sta;
1916
1917         rcu_read_lock();
1918
1919         list_for_each_entry_rcu(sta, &local->sta_list, list) {
1920                 if (sta->sdata == sdata &&
1921                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
1922                                jiffies)) {
1923                         active++;
1924                         break;
1925                 }
1926         }
1927
1928         rcu_read_unlock();
1929
1930         return active;
1931 }
1932
1933
1934 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
1935                                      struct ieee80211_if_sta *ifsta)
1936 {
1937         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1938
1939         ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
1940         if (ieee80211_sta_active_ibss(sdata))
1941                 return;
1942
1943         printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
1944                "IBSS networks with same SSID (merge)\n", sdata->dev->name);
1945         ieee80211_request_scan(sdata, ifsta->ssid, ifsta->ssid_len);
1946 }
1947
1948
1949 static void ieee80211_sta_timer(unsigned long data)
1950 {
1951         struct ieee80211_sub_if_data *sdata =
1952                 (struct ieee80211_sub_if_data *) data;
1953         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1954         struct ieee80211_local *local = sdata->local;
1955
1956         set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
1957         queue_work(local->hw.workqueue, &ifsta->work);
1958 }
1959
1960 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata,
1961                                      struct ieee80211_if_sta *ifsta)
1962 {
1963         struct ieee80211_local *local = sdata->local;
1964
1965         if (local->ops->reset_tsf) {
1966                 /* Reset own TSF to allow time synchronization work. */
1967                 local->ops->reset_tsf(local_to_hw(local));
1968         }
1969
1970         ifsta->wmm_last_param_set = -1; /* allow any WMM update */
1971
1972
1973         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1974                 ifsta->auth_alg = WLAN_AUTH_OPEN;
1975         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1976                 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
1977         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1978                 ifsta->auth_alg = WLAN_AUTH_LEAP;
1979         else
1980                 ifsta->auth_alg = WLAN_AUTH_OPEN;
1981         ifsta->auth_transaction = -1;
1982         ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
1983         ifsta->assoc_scan_tries = 0;
1984         ifsta->direct_probe_tries = 0;
1985         ifsta->auth_tries = 0;
1986         ifsta->assoc_tries = 0;
1987         netif_tx_stop_all_queues(sdata->dev);
1988         netif_carrier_off(sdata->dev);
1989 }
1990
1991
1992 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
1993                                     const char *ssid, int ssid_len)
1994 {
1995         int tmp, hidden_ssid;
1996
1997         if (ssid_len == ifsta->ssid_len &&
1998             !memcmp(ifsta->ssid, ssid, ssid_len))
1999                 return 1;
2000
2001         if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
2002                 return 0;
2003
2004         hidden_ssid = 1;
2005         tmp = ssid_len;
2006         while (tmp--) {
2007                 if (ssid[tmp] != '\0') {
2008                         hidden_ssid = 0;
2009                         break;
2010                 }
2011         }
2012
2013         if (hidden_ssid && (ifsta->ssid_len == ssid_len || ssid_len == 0))
2014                 return 1;
2015
2016         if (ssid_len == 1 && ssid[0] == ' ')
2017                 return 1;
2018
2019         return 0;
2020 }
2021
2022 static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata,
2023                                      struct ieee80211_if_sta *ifsta)
2024 {
2025         struct ieee80211_local *local = sdata->local;
2026         struct ieee80211_bss *bss;
2027         struct ieee80211_supported_band *sband;
2028         u8 bssid[ETH_ALEN], *pos;
2029         int i;
2030         int ret;
2031
2032 #if 0
2033         /* Easier testing, use fixed BSSID. */
2034         memset(bssid, 0xfe, ETH_ALEN);
2035 #else
2036         /* Generate random, not broadcast, locally administered BSSID. Mix in
2037          * own MAC address to make sure that devices that do not have proper
2038          * random number generator get different BSSID. */
2039         get_random_bytes(bssid, ETH_ALEN);
2040         for (i = 0; i < ETH_ALEN; i++)
2041                 bssid[i] ^= sdata->dev->dev_addr[i];
2042         bssid[0] &= ~0x01;
2043         bssid[0] |= 0x02;
2044 #endif
2045
2046         printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
2047                sdata->dev->name, bssid);
2048
2049         bss = ieee80211_rx_bss_add(local, bssid,
2050                                    local->hw.conf.channel->center_freq,
2051                                    sdata->u.sta.ssid, sdata->u.sta.ssid_len);
2052         if (!bss)
2053                 return -ENOMEM;
2054
2055         bss->band = local->hw.conf.channel->band;
2056         sband = local->hw.wiphy->bands[bss->band];
2057
2058         if (local->hw.conf.beacon_int == 0)
2059                 local->hw.conf.beacon_int = 100;
2060         bss->beacon_int = local->hw.conf.beacon_int;
2061         bss->last_update = jiffies;
2062         bss->capability = WLAN_CAPABILITY_IBSS;
2063
2064         if (sdata->default_key)
2065                 bss->capability |= WLAN_CAPABILITY_PRIVACY;
2066         else
2067                 sdata->drop_unencrypted = 0;
2068
2069         bss->supp_rates_len = sband->n_bitrates;
2070         pos = bss->supp_rates;
2071         for (i = 0; i < sband->n_bitrates; i++) {
2072                 int rate = sband->bitrates[i].bitrate;
2073                 *pos++ = (u8) (rate / 5);
2074         }
2075
2076         ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2077         ieee80211_rx_bss_put(local, bss);
2078         return ret;
2079 }
2080
2081
2082 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
2083                                    struct ieee80211_if_sta *ifsta)
2084 {
2085         struct ieee80211_local *local = sdata->local;
2086         struct ieee80211_bss *bss;
2087         int found = 0;
2088         u8 bssid[ETH_ALEN];
2089         int active_ibss;
2090
2091         if (ifsta->ssid_len == 0)
2092                 return -EINVAL;
2093
2094         active_ibss = ieee80211_sta_active_ibss(sdata);
2095 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2096         printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
2097                sdata->dev->name, active_ibss);
2098 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2099         spin_lock_bh(&local->bss_lock);
2100         list_for_each_entry(bss, &local->bss_list, list) {
2101                 if (ifsta->ssid_len != bss->ssid_len ||
2102                     memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
2103                     || !(bss->capability & WLAN_CAPABILITY_IBSS))
2104                         continue;
2105 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2106                 printk(KERN_DEBUG "   bssid=%pM found\n", bss->bssid);
2107 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2108                 memcpy(bssid, bss->bssid, ETH_ALEN);
2109                 found = 1;
2110                 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
2111                         break;
2112         }
2113         spin_unlock_bh(&local->bss_lock);
2114
2115 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2116         if (found)
2117                 printk(KERN_DEBUG "   sta_find_ibss: selected %pM current "
2118                        "%pM\n", bssid, ifsta->bssid);
2119 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2120
2121         if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2122                 int ret;
2123                 int search_freq;
2124
2125                 if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2126                         search_freq = bss->freq;
2127                 else
2128                         search_freq = local->hw.conf.channel->center_freq;
2129
2130                 bss = ieee80211_rx_bss_get(local, bssid, search_freq,
2131                                            ifsta->ssid, ifsta->ssid_len);
2132                 if (!bss)
2133                         goto dont_join;
2134
2135                 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
2136                        " based on configured SSID\n",
2137                        sdata->dev->name, bssid);
2138                 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2139                 ieee80211_rx_bss_put(local, bss);
2140                 return ret;
2141         }
2142
2143 dont_join:
2144 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2145         printk(KERN_DEBUG "   did not try to join ibss\n");
2146 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2147
2148         /* Selected IBSS not found in current scan results - try to scan */
2149         if (ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED &&
2150             !ieee80211_sta_active_ibss(sdata)) {
2151                 mod_timer(&ifsta->timer, jiffies +
2152                                       IEEE80211_IBSS_MERGE_INTERVAL);
2153         } else if (time_after(jiffies, local->last_scan_completed +
2154                               IEEE80211_SCAN_INTERVAL)) {
2155                 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
2156                        "join\n", sdata->dev->name);
2157                 return ieee80211_request_scan(sdata, ifsta->ssid,
2158                                               ifsta->ssid_len);
2159         } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) {
2160                 int interval = IEEE80211_SCAN_INTERVAL;
2161
2162                 if (time_after(jiffies, ifsta->ibss_join_req +
2163                                IEEE80211_IBSS_JOIN_TIMEOUT)) {
2164                         if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
2165                             (!(local->oper_channel->flags &
2166                                         IEEE80211_CHAN_NO_IBSS)))
2167                                 return ieee80211_sta_create_ibss(sdata, ifsta);
2168                         if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
2169                                 printk(KERN_DEBUG "%s: IBSS not allowed on"
2170                                        " %d MHz\n", sdata->dev->name,
2171                                        local->hw.conf.channel->center_freq);
2172                         }
2173
2174                         /* No IBSS found - decrease scan interval and continue
2175                          * scanning. */
2176                         interval = IEEE80211_SCAN_INTERVAL_SLOW;
2177                 }
2178
2179                 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2180                 mod_timer(&ifsta->timer, jiffies + interval);
2181                 return 0;
2182         }
2183
2184         return 0;
2185 }
2186
2187
2188 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
2189                                      struct ieee80211_if_sta *ifsta)
2190 {
2191         struct ieee80211_local *local = sdata->local;
2192         struct ieee80211_bss *bss, *selected = NULL;
2193         int top_rssi = 0, freq;
2194
2195         spin_lock_bh(&local->bss_lock);
2196         freq = local->oper_channel->center_freq;
2197         list_for_each_entry(bss, &local->bss_list, list) {
2198                 if (!(bss->capability & WLAN_CAPABILITY_ESS))
2199                         continue;
2200
2201                 if ((ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2202                         IEEE80211_STA_AUTO_BSSID_SEL |
2203                         IEEE80211_STA_AUTO_CHANNEL_SEL)) &&
2204                     (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
2205                      !!sdata->default_key))
2206                         continue;
2207
2208                 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
2209                     bss->freq != freq)
2210                         continue;
2211
2212                 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
2213                     memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
2214                         continue;
2215
2216                 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
2217                     !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
2218                         continue;
2219
2220                 if (!selected || top_rssi < bss->signal) {
2221                         selected = bss;
2222                         top_rssi = bss->signal;
2223                 }
2224         }
2225         if (selected)
2226                 atomic_inc(&selected->users);
2227         spin_unlock_bh(&local->bss_lock);
2228
2229         if (selected) {
2230                 ieee80211_set_freq(sdata, selected->freq);
2231                 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
2232                         ieee80211_sta_set_ssid(sdata, selected->ssid,
2233                                                selected->ssid_len);
2234                 ieee80211_sta_set_bssid(sdata, selected->bssid);
2235                 ieee80211_sta_def_wmm_params(sdata, selected);
2236
2237                 /* Send out direct probe if no probe resp was received or
2238                  * the one we have is outdated
2239                  */
2240                 if (!selected->last_probe_resp ||
2241                     time_after(jiffies, selected->last_probe_resp
2242                                         + IEEE80211_SCAN_RESULT_EXPIRE))
2243                         ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2244                 else
2245                         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2246
2247                 ieee80211_rx_bss_put(local, selected);
2248                 ieee80211_sta_reset_auth(sdata, ifsta);
2249                 return 0;
2250         } else {
2251                 if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2252                         ifsta->assoc_scan_tries++;
2253                         if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
2254                                 ieee80211_start_scan(sdata, NULL, 0);
2255                         else
2256                                 ieee80211_start_scan(sdata, ifsta->ssid,
2257                                                          ifsta->ssid_len);
2258                         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2259                         set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2260                 } else
2261                         ifsta->state = IEEE80211_STA_MLME_DISABLED;
2262         }
2263         return -1;
2264 }
2265
2266
2267 static void ieee80211_sta_work(struct work_struct *work)
2268 {
2269         struct ieee80211_sub_if_data *sdata =
2270                 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
2271         struct ieee80211_local *local = sdata->local;
2272         struct ieee80211_if_sta *ifsta;
2273         struct sk_buff *skb;
2274
2275         if (!netif_running(sdata->dev))
2276                 return;
2277
2278         if (local->sw_scanning || local->hw_scanning)
2279                 return;
2280
2281         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION &&
2282                     sdata->vif.type != NL80211_IFTYPE_ADHOC))
2283                 return;
2284         ifsta = &sdata->u.sta;
2285
2286         while ((skb = skb_dequeue(&ifsta->skb_queue)))
2287                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2288
2289         if (ifsta->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2290             ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2291             ifsta->state != IEEE80211_STA_MLME_ASSOCIATE &&
2292             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
2293                 ieee80211_start_scan(sdata, ifsta->scan_ssid,
2294                                      ifsta->scan_ssid_len);
2295                 return;
2296         }
2297
2298         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
2299                 if (ieee80211_sta_config_auth(sdata, ifsta))
2300                         return;
2301                 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2302         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
2303                 return;
2304
2305         switch (ifsta->state) {
2306         case IEEE80211_STA_MLME_DISABLED:
2307                 break;
2308         case IEEE80211_STA_MLME_DIRECT_PROBE:
2309                 ieee80211_direct_probe(sdata, ifsta);
2310                 break;
2311         case IEEE80211_STA_MLME_AUTHENTICATE:
2312                 ieee80211_authenticate(sdata, ifsta);
2313                 break;
2314         case IEEE80211_STA_MLME_ASSOCIATE:
2315                 ieee80211_associate(sdata, ifsta);
2316                 break;
2317         case IEEE80211_STA_MLME_ASSOCIATED:
2318                 ieee80211_associated(sdata, ifsta);
2319                 break;
2320         case IEEE80211_STA_MLME_IBSS_SEARCH:
2321                 ieee80211_sta_find_ibss(sdata, ifsta);
2322                 break;
2323         case IEEE80211_STA_MLME_IBSS_JOINED:
2324                 ieee80211_sta_merge_ibss(sdata, ifsta);
2325                 break;
2326         default:
2327                 WARN_ON(1);
2328                 break;
2329         }
2330
2331         if (ieee80211_privacy_mismatch(sdata, ifsta)) {
2332                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2333                        "mixed-cell disabled - disassociate\n", sdata->dev->name);
2334
2335                 ieee80211_set_disassoc(sdata, ifsta, false, true,
2336                                         WLAN_REASON_UNSPECIFIED);
2337         }
2338 }
2339
2340 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2341 {
2342         if (sdata->vif.type == NL80211_IFTYPE_STATION)
2343                 queue_work(sdata->local->hw.workqueue,
2344                            &sdata->u.sta.work);
2345 }
2346
2347 /* interface setup */
2348 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2349 {
2350         struct ieee80211_if_sta *ifsta;
2351
2352         ifsta = &sdata->u.sta;
2353         INIT_WORK(&ifsta->work, ieee80211_sta_work);
2354         setup_timer(&ifsta->timer, ieee80211_sta_timer,
2355                     (unsigned long) sdata);
2356         skb_queue_head_init(&ifsta->skb_queue);
2357
2358         ifsta->capab = WLAN_CAPABILITY_ESS;
2359         ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2360                 IEEE80211_AUTH_ALG_SHARED_KEY;
2361         ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
2362                 IEEE80211_STA_AUTO_BSSID_SEL |
2363                 IEEE80211_STA_AUTO_CHANNEL_SEL;
2364         if (ieee80211_num_regular_queues(&sdata->local->hw) >= 4)
2365                 ifsta->flags |= IEEE80211_STA_WMM_ENABLED;
2366 }
2367
2368 /*
2369  * Add a new IBSS station, will also be called by the RX code when,
2370  * in IBSS mode, receiving a frame from a yet-unknown station, hence
2371  * must be callable in atomic context.
2372  */
2373 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
2374                                         u8 *bssid,u8 *addr, u64 supp_rates)
2375 {
2376         struct ieee80211_local *local = sdata->local;
2377         struct sta_info *sta;
2378         int band = local->hw.conf.channel->band;
2379
2380         /* TODO: Could consider removing the least recently used entry and
2381          * allow new one to be added. */
2382         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
2383                 if (net_ratelimit()) {
2384                         printk(KERN_DEBUG "%s: No room for a new IBSS STA "
2385                                "entry %pM\n", sdata->dev->name, addr);
2386                 }
2387                 return NULL;
2388         }
2389
2390         if (compare_ether_addr(bssid, sdata->u.sta.bssid))
2391                 return NULL;
2392
2393 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2394         printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
2395                wiphy_name(local->hw.wiphy), addr, sdata->dev->name);
2396 #endif
2397
2398         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
2399         if (!sta)
2400                 return NULL;
2401
2402         set_sta_flags(sta, WLAN_STA_AUTHORIZED);
2403
2404         /* make sure mandatory rates are always added */
2405         sta->sta.supp_rates[band] = supp_rates |
2406                         ieee80211_mandatory_rates(local, band);
2407
2408         rate_control_rate_init(sta);
2409
2410         if (sta_info_insert(sta))
2411                 return NULL;
2412
2413         return sta;
2414 }
2415
2416 /* configuration hooks */
2417 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata,
2418                             struct ieee80211_if_sta *ifsta)
2419 {
2420         struct ieee80211_local *local = sdata->local;
2421
2422         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2423                 return;
2424
2425         if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
2426                              IEEE80211_STA_AUTO_BSSID_SEL)) &&
2427             (ifsta->flags & (IEEE80211_STA_SSID_SET |
2428                              IEEE80211_STA_AUTO_SSID_SEL))) {
2429
2430                 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED)
2431                         ieee80211_set_disassoc(sdata, ifsta, true, true,
2432                                                WLAN_REASON_DEAUTH_LEAVING);
2433
2434                 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2435                 queue_work(local->hw.workqueue, &ifsta->work);
2436         }
2437 }
2438
2439 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2440 {
2441         struct ieee80211_if_sta *ifsta;
2442
2443         if (len > IEEE80211_MAX_SSID_LEN)
2444                 return -EINVAL;
2445
2446         ifsta = &sdata->u.sta;
2447
2448         if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) {
2449                 memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
2450                 memcpy(ifsta->ssid, ssid, len);
2451                 ifsta->ssid_len = len;
2452                 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2453         }
2454
2455         if (len)
2456                 ifsta->flags |= IEEE80211_STA_SSID_SET;
2457         else
2458                 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
2459
2460         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
2461             !(ifsta->flags & IEEE80211_STA_BSSID_SET)) {
2462                 ifsta->ibss_join_req = jiffies;
2463                 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2464                 return ieee80211_sta_find_ibss(sdata, ifsta);
2465         }
2466
2467         return 0;
2468 }
2469
2470 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2471 {
2472         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2473         memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
2474         *len = ifsta->ssid_len;
2475         return 0;
2476 }
2477
2478 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2479 {
2480         struct ieee80211_if_sta *ifsta;
2481         int res;
2482
2483         ifsta = &sdata->u.sta;
2484
2485         if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2486                 memcpy(ifsta->bssid, bssid, ETH_ALEN);
2487                 res = 0;
2488                 /*
2489                  * Hack! See also ieee80211_sta_set_ssid.
2490                  */
2491                 if (netif_running(sdata->dev))
2492                         res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
2493                 if (res) {
2494                         printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2495                                "the low-level driver\n", sdata->dev->name);
2496                         return res;
2497                 }
2498         }
2499
2500         if (is_valid_ether_addr(bssid))
2501                 ifsta->flags |= IEEE80211_STA_BSSID_SET;
2502         else
2503                 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
2504
2505         return 0;
2506 }
2507
2508 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
2509 {
2510         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2511
2512         kfree(ifsta->extra_ie);
2513         if (len == 0) {
2514                 ifsta->extra_ie = NULL;
2515                 ifsta->extra_ie_len = 0;
2516                 return 0;
2517         }
2518         ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
2519         if (!ifsta->extra_ie) {
2520                 ifsta->extra_ie_len = 0;
2521                 return -ENOMEM;
2522         }
2523         memcpy(ifsta->extra_ie, ie, len);
2524         ifsta->extra_ie_len = len;
2525         return 0;
2526 }
2527
2528 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2529 {
2530         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2531
2532         printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2533                sdata->dev->name, reason);
2534
2535         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2536             sdata->vif.type != NL80211_IFTYPE_ADHOC)
2537                 return -EINVAL;
2538
2539         ieee80211_set_disassoc(sdata, ifsta, true, true, reason);
2540         return 0;
2541 }
2542
2543 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2544 {
2545         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2546
2547         printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2548                sdata->dev->name, reason);
2549
2550         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2551                 return -EINVAL;
2552
2553         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
2554                 return -1;
2555
2556         ieee80211_set_disassoc(sdata, ifsta, false, true, reason);
2557         return 0;
2558 }
2559
2560 /* scan finished notification */
2561 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2562 {
2563         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2564         struct ieee80211_if_sta *ifsta;
2565
2566         if (sdata && sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2567                 ifsta = &sdata->u.sta;
2568                 if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) ||
2569                     (!(ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED) &&
2570                     !ieee80211_sta_active_ibss(sdata)))
2571                         ieee80211_sta_find_ibss(sdata, ifsta);
2572         }
2573
2574         /* Restart STA timers */
2575         rcu_read_lock();
2576         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2577                 ieee80211_restart_sta_timer(sdata);
2578         rcu_read_unlock();
2579 }