mac80211: fix notify_mac function
[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/netdevice.h>
18 #include <linux/if_arp.h>
19 #include <linux/wireless.h>
20 #include <linux/random.h>
21 #include <linux/etherdevice.h>
22 #include <linux/rtnetlink.h>
23 #include <net/iw_handler.h>
24 #include <net/mac80211.h>
25 #include <asm/unaligned.h>
26
27 #include "ieee80211_i.h"
28 #include "rate.h"
29 #include "led.h"
30
31 #define IEEE80211_ASSOC_SCANS_MAX_TRIES 2
32 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
33 #define IEEE80211_AUTH_MAX_TRIES 3
34 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
35 #define IEEE80211_ASSOC_MAX_TRIES 3
36 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
37 #define IEEE80211_PROBE_INTERVAL (60 * HZ)
38 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
39 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
40 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
41 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
42
43 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
44 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
45
46 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
47
48
49 /* utils */
50 static int ecw2cw(int ecw)
51 {
52         return (1 << ecw) - 1;
53 }
54
55 static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie)
56 {
57         u8 *end, *pos;
58
59         pos = bss->ies;
60         if (pos == NULL)
61                 return NULL;
62         end = pos + bss->ies_len;
63
64         while (pos + 1 < end) {
65                 if (pos + 2 + pos[1] > end)
66                         break;
67                 if (pos[0] == ie)
68                         return pos;
69                 pos += 2 + pos[1];
70         }
71
72         return NULL;
73 }
74
75 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
76                                       struct ieee80211_supported_band *sband,
77                                       u64 *rates)
78 {
79         int i, j, count;
80         *rates = 0;
81         count = 0;
82         for (i = 0; i < bss->supp_rates_len; i++) {
83                 int rate = (bss->supp_rates[i] & 0x7F) * 5;
84
85                 for (j = 0; j < sband->n_bitrates; j++)
86                         if (sband->bitrates[j].bitrate == rate) {
87                                 *rates |= BIT(j);
88                                 count++;
89                                 break;
90                         }
91         }
92
93         return count;
94 }
95
96 /* also used by mesh code */
97 u64 ieee80211_sta_get_rates(struct ieee80211_local *local,
98                             struct ieee802_11_elems *elems,
99                             enum ieee80211_band band)
100 {
101         struct ieee80211_supported_band *sband;
102         struct ieee80211_rate *bitrates;
103         size_t num_rates;
104         u64 supp_rates;
105         int i, j;
106         sband = local->hw.wiphy->bands[band];
107
108         if (!sband) {
109                 WARN_ON(1);
110                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
111         }
112
113         bitrates = sband->bitrates;
114         num_rates = sband->n_bitrates;
115         supp_rates = 0;
116         for (i = 0; i < elems->supp_rates_len +
117                      elems->ext_supp_rates_len; i++) {
118                 u8 rate = 0;
119                 int own_rate;
120                 if (i < elems->supp_rates_len)
121                         rate = elems->supp_rates[i];
122                 else if (elems->ext_supp_rates)
123                         rate = elems->ext_supp_rates
124                                 [i - elems->supp_rates_len];
125                 own_rate = 5 * (rate & 0x7f);
126                 for (j = 0; j < num_rates; j++)
127                         if (bitrates[j].bitrate == own_rate)
128                                 supp_rates |= BIT(j);
129         }
130         return supp_rates;
131 }
132
133 /* frame sending functions */
134
135 /* also used by scanning code */
136 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
137                               u8 *ssid, size_t ssid_len)
138 {
139         struct ieee80211_local *local = sdata->local;
140         struct ieee80211_supported_band *sband;
141         struct sk_buff *skb;
142         struct ieee80211_mgmt *mgmt;
143         u8 *pos, *supp_rates, *esupp_rates = NULL;
144         int i;
145
146         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200);
147         if (!skb) {
148                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
149                        "request\n", sdata->dev->name);
150                 return;
151         }
152         skb_reserve(skb, local->hw.extra_tx_headroom);
153
154         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
155         memset(mgmt, 0, 24);
156         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
157                                           IEEE80211_STYPE_PROBE_REQ);
158         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
159         if (dst) {
160                 memcpy(mgmt->da, dst, ETH_ALEN);
161                 memcpy(mgmt->bssid, dst, ETH_ALEN);
162         } else {
163                 memset(mgmt->da, 0xff, ETH_ALEN);
164                 memset(mgmt->bssid, 0xff, ETH_ALEN);
165         }
166         pos = skb_put(skb, 2 + ssid_len);
167         *pos++ = WLAN_EID_SSID;
168         *pos++ = ssid_len;
169         memcpy(pos, ssid, ssid_len);
170
171         supp_rates = skb_put(skb, 2);
172         supp_rates[0] = WLAN_EID_SUPP_RATES;
173         supp_rates[1] = 0;
174         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
175
176         for (i = 0; i < sband->n_bitrates; i++) {
177                 struct ieee80211_rate *rate = &sband->bitrates[i];
178                 if (esupp_rates) {
179                         pos = skb_put(skb, 1);
180                         esupp_rates[1]++;
181                 } else if (supp_rates[1] == 8) {
182                         esupp_rates = skb_put(skb, 3);
183                         esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
184                         esupp_rates[1] = 1;
185                         pos = &esupp_rates[2];
186                 } else {
187                         pos = skb_put(skb, 1);
188                         supp_rates[1]++;
189                 }
190                 *pos = rate->bitrate / 5;
191         }
192
193         ieee80211_tx_skb(sdata, skb, 0);
194 }
195
196 static void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
197                                 struct ieee80211_if_sta *ifsta,
198                                 int transaction, u8 *extra, size_t extra_len,
199                                 int encrypt)
200 {
201         struct ieee80211_local *local = sdata->local;
202         struct sk_buff *skb;
203         struct ieee80211_mgmt *mgmt;
204
205         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
206                             sizeof(*mgmt) + 6 + extra_len);
207         if (!skb) {
208                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
209                        "frame\n", sdata->dev->name);
210                 return;
211         }
212         skb_reserve(skb, local->hw.extra_tx_headroom);
213
214         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
215         memset(mgmt, 0, 24 + 6);
216         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
217                                           IEEE80211_STYPE_AUTH);
218         if (encrypt)
219                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
220         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
221         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
222         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
223         mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg);
224         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
225         ifsta->auth_transaction = transaction + 1;
226         mgmt->u.auth.status_code = cpu_to_le16(0);
227         if (extra)
228                 memcpy(skb_put(skb, extra_len), extra, extra_len);
229
230         ieee80211_tx_skb(sdata, skb, encrypt);
231 }
232
233 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
234                                  struct ieee80211_if_sta *ifsta)
235 {
236         struct ieee80211_local *local = sdata->local;
237         struct sk_buff *skb;
238         struct ieee80211_mgmt *mgmt;
239         u8 *pos, *ies, *ht_add_ie;
240         int i, len, count, rates_len, supp_rates_len;
241         u16 capab;
242         struct ieee80211_bss *bss;
243         int wmm = 0;
244         struct ieee80211_supported_band *sband;
245         u64 rates = 0;
246
247         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
248                             sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
249                             ifsta->ssid_len);
250         if (!skb) {
251                 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
252                        "frame\n", sdata->dev->name);
253                 return;
254         }
255         skb_reserve(skb, local->hw.extra_tx_headroom);
256
257         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
258
259         capab = ifsta->capab;
260
261         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
262                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
263                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
264                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
265                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
266         }
267
268         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
269                                    local->hw.conf.channel->center_freq,
270                                    ifsta->ssid, ifsta->ssid_len);
271         if (bss) {
272                 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
273                         capab |= WLAN_CAPABILITY_PRIVACY;
274                 if (bss->wmm_used)
275                         wmm = 1;
276
277                 /* get all rates supported by the device and the AP as
278                  * some APs don't like getting a superset of their rates
279                  * in the association request (e.g. D-Link DAP 1353 in
280                  * b-only mode) */
281                 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
282
283                 if ((bss->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
284                     (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
285                         capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
286
287                 ieee80211_rx_bss_put(local, bss);
288         } else {
289                 rates = ~0;
290                 rates_len = sband->n_bitrates;
291         }
292
293         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
294         memset(mgmt, 0, 24);
295         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
296         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
297         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
298
299         if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
300                 skb_put(skb, 10);
301                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
302                                                   IEEE80211_STYPE_REASSOC_REQ);
303                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
304                 mgmt->u.reassoc_req.listen_interval =
305                                 cpu_to_le16(local->hw.conf.listen_interval);
306                 memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
307                        ETH_ALEN);
308         } else {
309                 skb_put(skb, 4);
310                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
311                                                   IEEE80211_STYPE_ASSOC_REQ);
312                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
313                 mgmt->u.reassoc_req.listen_interval =
314                                 cpu_to_le16(local->hw.conf.listen_interval);
315         }
316
317         /* SSID */
318         ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
319         *pos++ = WLAN_EID_SSID;
320         *pos++ = ifsta->ssid_len;
321         memcpy(pos, ifsta->ssid, ifsta->ssid_len);
322
323         /* add all rates which were marked to be used above */
324         supp_rates_len = rates_len;
325         if (supp_rates_len > 8)
326                 supp_rates_len = 8;
327
328         len = sband->n_bitrates;
329         pos = skb_put(skb, supp_rates_len + 2);
330         *pos++ = WLAN_EID_SUPP_RATES;
331         *pos++ = supp_rates_len;
332
333         count = 0;
334         for (i = 0; i < sband->n_bitrates; i++) {
335                 if (BIT(i) & rates) {
336                         int rate = sband->bitrates[i].bitrate;
337                         *pos++ = (u8) (rate / 5);
338                         if (++count == 8)
339                                 break;
340                 }
341         }
342
343         if (rates_len > count) {
344                 pos = skb_put(skb, rates_len - count + 2);
345                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
346                 *pos++ = rates_len - count;
347
348                 for (i++; i < sband->n_bitrates; i++) {
349                         if (BIT(i) & rates) {
350                                 int rate = sband->bitrates[i].bitrate;
351                                 *pos++ = (u8) (rate / 5);
352                         }
353                 }
354         }
355
356         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
357                 /* 1. power capabilities */
358                 pos = skb_put(skb, 4);
359                 *pos++ = WLAN_EID_PWR_CAPABILITY;
360                 *pos++ = 2;
361                 *pos++ = 0; /* min tx power */
362                 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
363
364                 /* 2. supported channels */
365                 /* TODO: get this in reg domain format */
366                 pos = skb_put(skb, 2 * sband->n_channels + 2);
367                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
368                 *pos++ = 2 * sband->n_channels;
369                 for (i = 0; i < sband->n_channels; i++) {
370                         *pos++ = ieee80211_frequency_to_channel(
371                                         sband->channels[i].center_freq);
372                         *pos++ = 1; /* one channel in the subband*/
373                 }
374         }
375
376         if (ifsta->extra_ie) {
377                 pos = skb_put(skb, ifsta->extra_ie_len);
378                 memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
379         }
380
381         if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
382                 pos = skb_put(skb, 9);
383                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
384                 *pos++ = 7; /* len */
385                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
386                 *pos++ = 0x50;
387                 *pos++ = 0xf2;
388                 *pos++ = 2; /* WME */
389                 *pos++ = 0; /* WME info */
390                 *pos++ = 1; /* WME ver */
391                 *pos++ = 0;
392         }
393
394         /* wmm support is a must to HT */
395         if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
396             sband->ht_info.ht_supported &&
397             (ht_add_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_EXTRA_INFO))) {
398                 struct ieee80211_ht_addt_info *ht_add_info =
399                         (struct ieee80211_ht_addt_info *)ht_add_ie;
400                 u16 cap = sband->ht_info.cap;
401                 __le16 tmp;
402                 u32 flags = local->hw.conf.channel->flags;
403
404                 switch (ht_add_info->ht_param & IEEE80211_HT_IE_CHA_SEC_OFFSET) {
405                 case IEEE80211_HT_IE_CHA_SEC_ABOVE:
406                         if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
407                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH;
408                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
409                         }
410                         break;
411                 case IEEE80211_HT_IE_CHA_SEC_BELOW:
412                         if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
413                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH;
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_info.ampdu_factor |
428                          (sband->ht_info.ampdu_density << 2);
429                 memcpy(pos, sband->ht_info.supp_mcs_set, 16);
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_protect_preamb(struct ieee80211_sub_if_data *sdata,
572                                            bool use_protection,
573                                            bool use_short_preamble)
574 {
575         struct ieee80211_bss_conf *bss_conf = &sdata->bss_conf;
576 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
577         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
578         DECLARE_MAC_BUF(mac);
579 #endif
580         u32 changed = 0;
581
582         if (use_protection != bss_conf->use_cts_prot) {
583 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
584                 if (net_ratelimit()) {
585                         printk(KERN_DEBUG "%s: CTS protection %s (BSSID="
586                                "%s)\n",
587                                sdata->dev->name,
588                                use_protection ? "enabled" : "disabled",
589                                print_mac(mac, ifsta->bssid));
590                 }
591 #endif
592                 bss_conf->use_cts_prot = use_protection;
593                 changed |= BSS_CHANGED_ERP_CTS_PROT;
594         }
595
596         if (use_short_preamble != bss_conf->use_short_preamble) {
597 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
598                 if (net_ratelimit()) {
599                         printk(KERN_DEBUG "%s: switched to %s barker preamble"
600                                " (BSSID=%s)\n",
601                                sdata->dev->name,
602                                use_short_preamble ? "short" : "long",
603                                print_mac(mac, ifsta->bssid));
604                 }
605 #endif
606                 bss_conf->use_short_preamble = use_short_preamble;
607                 changed |= BSS_CHANGED_ERP_PREAMBLE;
608         }
609
610         return changed;
611 }
612
613 static u32 ieee80211_handle_erp_ie(struct ieee80211_sub_if_data *sdata,
614                                    u8 erp_value)
615 {
616         bool use_protection = (erp_value & WLAN_ERP_USE_PROTECTION) != 0;
617         bool use_short_preamble = (erp_value & WLAN_ERP_BARKER_PREAMBLE) == 0;
618
619         return ieee80211_handle_protect_preamb(sdata,
620                         use_protection, use_short_preamble);
621 }
622
623 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
624                                            struct ieee80211_bss *bss)
625 {
626         u32 changed = 0;
627
628         if (bss->has_erp_value)
629                 changed |= ieee80211_handle_erp_ie(sdata, bss->erp_value);
630         else {
631                 u16 capab = bss->capability;
632                 changed |= ieee80211_handle_protect_preamb(sdata, false,
633                                 (capab & WLAN_CAPABILITY_SHORT_PREAMBLE) != 0);
634         }
635
636         return changed;
637 }
638
639 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata,
640                                         struct ieee80211_if_sta *ifsta)
641 {
642         union iwreq_data wrqu;
643         memset(&wrqu, 0, sizeof(wrqu));
644         if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
645                 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
646         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
647         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
648 }
649
650 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata,
651                                          struct ieee80211_if_sta *ifsta)
652 {
653         char *buf;
654         size_t len;
655         int i;
656         union iwreq_data wrqu;
657
658         if (!ifsta->assocreq_ies && !ifsta->assocresp_ies)
659                 return;
660
661         buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len +
662                                 ifsta->assocresp_ies_len), GFP_KERNEL);
663         if (!buf)
664                 return;
665
666         len = sprintf(buf, "ASSOCINFO(");
667         if (ifsta->assocreq_ies) {
668                 len += sprintf(buf + len, "ReqIEs=");
669                 for (i = 0; i < ifsta->assocreq_ies_len; i++) {
670                         len += sprintf(buf + len, "%02x",
671                                        ifsta->assocreq_ies[i]);
672                 }
673         }
674         if (ifsta->assocresp_ies) {
675                 if (ifsta->assocreq_ies)
676                         len += sprintf(buf + len, " ");
677                 len += sprintf(buf + len, "RespIEs=");
678                 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
679                         len += sprintf(buf + len, "%02x",
680                                        ifsta->assocresp_ies[i]);
681                 }
682         }
683         len += sprintf(buf + len, ")");
684
685         if (len > IW_CUSTOM_MAX) {
686                 len = sprintf(buf, "ASSOCRESPIE=");
687                 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
688                         len += sprintf(buf + len, "%02x",
689                                        ifsta->assocresp_ies[i]);
690                 }
691         }
692
693         if (len <= IW_CUSTOM_MAX) {
694                 memset(&wrqu, 0, sizeof(wrqu));
695                 wrqu.data.length = len;
696                 wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
697         }
698
699         kfree(buf);
700 }
701
702
703 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
704                                      struct ieee80211_if_sta *ifsta)
705 {
706         struct ieee80211_local *local = sdata->local;
707         struct ieee80211_conf *conf = &local_to_hw(local)->conf;
708         u32 changed = BSS_CHANGED_ASSOC;
709
710         struct ieee80211_bss *bss;
711
712         ifsta->flags |= IEEE80211_STA_ASSOCIATED;
713
714         if (sdata->vif.type != NL80211_IFTYPE_STATION)
715                 return;
716
717         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
718                                    conf->channel->center_freq,
719                                    ifsta->ssid, ifsta->ssid_len);
720         if (bss) {
721                 /* set timing information */
722                 sdata->bss_conf.beacon_int = bss->beacon_int;
723                 sdata->bss_conf.timestamp = bss->timestamp;
724                 sdata->bss_conf.dtim_period = bss->dtim_period;
725
726                 changed |= ieee80211_handle_bss_capability(sdata, bss);
727
728                 ieee80211_rx_bss_put(local, bss);
729         }
730
731         if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) {
732                 changed |= BSS_CHANGED_HT;
733                 sdata->bss_conf.assoc_ht = 1;
734                 sdata->bss_conf.ht_conf = &conf->ht_conf;
735                 sdata->bss_conf.ht_bss_conf = &conf->ht_bss_conf;
736         }
737
738         ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
739         memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
740         ieee80211_sta_send_associnfo(sdata, ifsta);
741
742         ifsta->last_probe = jiffies;
743         ieee80211_led_assoc(local, 1);
744
745         sdata->bss_conf.assoc = 1;
746         /*
747          * For now just always ask the driver to update the basic rateset
748          * when we have associated, we aren't checking whether it actually
749          * changed or not.
750          */
751         changed |= BSS_CHANGED_BASIC_RATES;
752         ieee80211_bss_info_change_notify(sdata, changed);
753
754         netif_tx_start_all_queues(sdata->dev);
755         netif_carrier_on(sdata->dev);
756
757         ieee80211_sta_send_apinfo(sdata, ifsta);
758 }
759
760 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
761                                    struct ieee80211_if_sta *ifsta)
762 {
763         DECLARE_MAC_BUF(mac);
764
765         ifsta->direct_probe_tries++;
766         if (ifsta->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
767                 printk(KERN_DEBUG "%s: direct probe to AP %s timed out\n",
768                        sdata->dev->name, print_mac(mac, ifsta->bssid));
769                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
770                 return;
771         }
772
773         printk(KERN_DEBUG "%s: direct probe to AP %s try %d\n",
774                         sdata->dev->name, print_mac(mac, ifsta->bssid),
775                         ifsta->direct_probe_tries);
776
777         ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
778
779         set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifsta->request);
780
781         /* Direct probe is sent to broadcast address as some APs
782          * will not answer to direct packet in unassociated state.
783          */
784         ieee80211_send_probe_req(sdata, NULL,
785                                  ifsta->ssid, ifsta->ssid_len);
786
787         mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
788 }
789
790
791 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
792                                    struct ieee80211_if_sta *ifsta)
793 {
794         DECLARE_MAC_BUF(mac);
795
796         ifsta->auth_tries++;
797         if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
798                 printk(KERN_DEBUG "%s: authentication with AP %s"
799                        " timed out\n",
800                        sdata->dev->name, print_mac(mac, ifsta->bssid));
801                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
802                 return;
803         }
804
805         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
806         printk(KERN_DEBUG "%s: authenticate with AP %s\n",
807                sdata->dev->name, print_mac(mac, ifsta->bssid));
808
809         ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0);
810
811         mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
812 }
813
814 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
815                                    struct ieee80211_if_sta *ifsta, bool deauth,
816                                    bool self_disconnected, u16 reason)
817 {
818         struct ieee80211_local *local = sdata->local;
819         struct sta_info *sta;
820         u32 changed = BSS_CHANGED_ASSOC;
821
822         rcu_read_lock();
823
824         sta = sta_info_get(local, ifsta->bssid);
825         if (!sta) {
826                 rcu_read_unlock();
827                 return;
828         }
829
830         if (deauth) {
831                 ifsta->direct_probe_tries = 0;
832                 ifsta->auth_tries = 0;
833         }
834         ifsta->assoc_scan_tries = 0;
835         ifsta->assoc_tries = 0;
836
837         netif_tx_stop_all_queues(sdata->dev);
838         netif_carrier_off(sdata->dev);
839
840         ieee80211_sta_tear_down_BA_sessions(sdata, sta->sta.addr);
841
842         if (self_disconnected) {
843                 if (deauth)
844                         ieee80211_send_deauth_disassoc(sdata,
845                                 IEEE80211_STYPE_DEAUTH, reason);
846                 else
847                         ieee80211_send_deauth_disassoc(sdata,
848                                 IEEE80211_STYPE_DISASSOC, reason);
849         }
850
851         ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
852         changed |= ieee80211_reset_erp_info(sdata);
853
854         if (sdata->bss_conf.assoc_ht)
855                 changed |= BSS_CHANGED_HT;
856
857         sdata->bss_conf.assoc_ht = 0;
858         sdata->bss_conf.ht_conf = NULL;
859         sdata->bss_conf.ht_bss_conf = NULL;
860
861         ieee80211_led_assoc(local, 0);
862         sdata->bss_conf.assoc = 0;
863
864         ieee80211_sta_send_apinfo(sdata, ifsta);
865
866         if (self_disconnected)
867                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
868
869         sta_info_unlink(&sta);
870
871         rcu_read_unlock();
872
873         sta_info_destroy(sta);
874 }
875
876 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
877 {
878         if (!sdata || !sdata->default_key ||
879             sdata->default_key->conf.alg != ALG_WEP)
880                 return 0;
881         return 1;
882 }
883
884 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
885                                       struct ieee80211_if_sta *ifsta)
886 {
887         struct ieee80211_local *local = sdata->local;
888         struct ieee80211_bss *bss;
889         int bss_privacy;
890         int wep_privacy;
891         int privacy_invoked;
892
893         if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
894                 return 0;
895
896         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
897                                    local->hw.conf.channel->center_freq,
898                                    ifsta->ssid, ifsta->ssid_len);
899         if (!bss)
900                 return 0;
901
902         bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
903         wep_privacy = !!ieee80211_sta_wep_configured(sdata);
904         privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
905
906         ieee80211_rx_bss_put(local, bss);
907
908         if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
909                 return 0;
910
911         return 1;
912 }
913
914 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
915                                 struct ieee80211_if_sta *ifsta)
916 {
917         DECLARE_MAC_BUF(mac);
918
919         ifsta->assoc_tries++;
920         if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
921                 printk(KERN_DEBUG "%s: association with AP %s"
922                        " timed out\n",
923                        sdata->dev->name, print_mac(mac, ifsta->bssid));
924                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
925                 return;
926         }
927
928         ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
929         printk(KERN_DEBUG "%s: associate with AP %s\n",
930                sdata->dev->name, print_mac(mac, ifsta->bssid));
931         if (ieee80211_privacy_mismatch(sdata, ifsta)) {
932                 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
933                        "mixed-cell disabled - abort association\n", sdata->dev->name);
934                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
935                 return;
936         }
937
938         ieee80211_send_assoc(sdata, ifsta);
939
940         mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
941 }
942
943
944 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
945                                  struct ieee80211_if_sta *ifsta)
946 {
947         struct ieee80211_local *local = sdata->local;
948         struct sta_info *sta;
949         int disassoc;
950         DECLARE_MAC_BUF(mac);
951
952         /* TODO: start monitoring current AP signal quality and number of
953          * missed beacons. Scan other channels every now and then and search
954          * for better APs. */
955         /* TODO: remove expired BSSes */
956
957         ifsta->state = IEEE80211_STA_MLME_ASSOCIATED;
958
959         rcu_read_lock();
960
961         sta = sta_info_get(local, ifsta->bssid);
962         if (!sta) {
963                 printk(KERN_DEBUG "%s: No STA entry for own AP %s\n",
964                        sdata->dev->name, print_mac(mac, ifsta->bssid));
965                 disassoc = 1;
966         } else {
967                 disassoc = 0;
968                 if (time_after(jiffies,
969                                sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
970                         if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
971                                 printk(KERN_DEBUG "%s: No ProbeResp from "
972                                        "current AP %s - assume out of "
973                                        "range\n",
974                                        sdata->dev->name, print_mac(mac, ifsta->bssid));
975                                 disassoc = 1;
976                         } else
977                                 ieee80211_send_probe_req(sdata, ifsta->bssid,
978                                                          ifsta->ssid,
979                                                          ifsta->ssid_len);
980                         ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
981                 } else {
982                         ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
983                         if (time_after(jiffies, ifsta->last_probe +
984                                        IEEE80211_PROBE_INTERVAL)) {
985                                 ifsta->last_probe = jiffies;
986                                 ieee80211_send_probe_req(sdata, ifsta->bssid,
987                                                          ifsta->ssid,
988                                                          ifsta->ssid_len);
989                         }
990                 }
991         }
992
993         rcu_read_unlock();
994
995         if (disassoc)
996                 ieee80211_set_disassoc(sdata, ifsta, true, true,
997                                         WLAN_REASON_PREV_AUTH_NOT_VALID);
998         else
999                 mod_timer(&ifsta->timer, jiffies +
1000                                       IEEE80211_MONITORING_INTERVAL);
1001 }
1002
1003
1004 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1005                                      struct ieee80211_if_sta *ifsta)
1006 {
1007         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1008         ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
1009         ieee80211_associate(sdata, ifsta);
1010 }
1011
1012
1013 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1014                                      struct ieee80211_if_sta *ifsta,
1015                                      struct ieee80211_mgmt *mgmt,
1016                                      size_t len)
1017 {
1018         u8 *pos;
1019         struct ieee802_11_elems elems;
1020
1021         pos = mgmt->u.auth.variable;
1022         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1023         if (!elems.challenge)
1024                 return;
1025         ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2,
1026                             elems.challenge_len + 2, 1);
1027 }
1028
1029 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1030                                    struct ieee80211_if_sta *ifsta,
1031                                    struct ieee80211_mgmt *mgmt,
1032                                    size_t len)
1033 {
1034         u16 auth_alg, auth_transaction, status_code;
1035         DECLARE_MAC_BUF(mac);
1036
1037         if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1038             sdata->vif.type != NL80211_IFTYPE_ADHOC)
1039                 return;
1040
1041         if (len < 24 + 6)
1042                 return;
1043
1044         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1045             memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1046                 return;
1047
1048         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1049             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1050                 return;
1051
1052         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1053         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1054         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1055
1056         if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1057                 /*
1058                  * IEEE 802.11 standard does not require authentication in IBSS
1059                  * networks and most implementations do not seem to use it.
1060                  * However, try to reply to authentication attempts if someone
1061                  * has actually implemented this.
1062                  */
1063                 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1064                         return;
1065                 ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0);
1066         }
1067
1068         if (auth_alg != ifsta->auth_alg ||
1069             auth_transaction != ifsta->auth_transaction)
1070                 return;
1071
1072         if (status_code != WLAN_STATUS_SUCCESS) {
1073                 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1074                         u8 algs[3];
1075                         const int num_algs = ARRAY_SIZE(algs);
1076                         int i, pos;
1077                         algs[0] = algs[1] = algs[2] = 0xff;
1078                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1079                                 algs[0] = WLAN_AUTH_OPEN;
1080                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1081                                 algs[1] = WLAN_AUTH_SHARED_KEY;
1082                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1083                                 algs[2] = WLAN_AUTH_LEAP;
1084                         if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1085                                 pos = 0;
1086                         else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1087                                 pos = 1;
1088                         else
1089                                 pos = 2;
1090                         for (i = 0; i < num_algs; i++) {
1091                                 pos++;
1092                                 if (pos >= num_algs)
1093                                         pos = 0;
1094                                 if (algs[pos] == ifsta->auth_alg ||
1095                                     algs[pos] == 0xff)
1096                                         continue;
1097                                 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1098                                     !ieee80211_sta_wep_configured(sdata))
1099                                         continue;
1100                                 ifsta->auth_alg = algs[pos];
1101                                 break;
1102                         }
1103                 }
1104                 return;
1105         }
1106
1107         switch (ifsta->auth_alg) {
1108         case WLAN_AUTH_OPEN:
1109         case WLAN_AUTH_LEAP:
1110                 ieee80211_auth_completed(sdata, ifsta);
1111                 break;
1112         case WLAN_AUTH_SHARED_KEY:
1113                 if (ifsta->auth_transaction == 4)
1114                         ieee80211_auth_completed(sdata, ifsta);
1115                 else
1116                         ieee80211_auth_challenge(sdata, ifsta, mgmt, len);
1117                 break;
1118         }
1119 }
1120
1121
1122 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1123                                      struct ieee80211_if_sta *ifsta,
1124                                      struct ieee80211_mgmt *mgmt,
1125                                      size_t len)
1126 {
1127         u16 reason_code;
1128         DECLARE_MAC_BUF(mac);
1129
1130         if (len < 24 + 2)
1131                 return;
1132
1133         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1134                 return;
1135
1136         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1137
1138         if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
1139                 printk(KERN_DEBUG "%s: deauthenticated\n", sdata->dev->name);
1140
1141         if (ifsta->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1142             ifsta->state == IEEE80211_STA_MLME_ASSOCIATE ||
1143             ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1144                 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1145                 mod_timer(&ifsta->timer, jiffies +
1146                                       IEEE80211_RETRY_AUTH_INTERVAL);
1147         }
1148
1149         ieee80211_set_disassoc(sdata, ifsta, true, false, 0);
1150         ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1151 }
1152
1153
1154 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1155                                        struct ieee80211_if_sta *ifsta,
1156                                        struct ieee80211_mgmt *mgmt,
1157                                        size_t len)
1158 {
1159         u16 reason_code;
1160         DECLARE_MAC_BUF(mac);
1161
1162         if (len < 24 + 2)
1163                 return;
1164
1165         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1166                 return;
1167
1168         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1169
1170         if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1171                 printk(KERN_DEBUG "%s: disassociated\n", sdata->dev->name);
1172
1173         if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1174                 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1175                 mod_timer(&ifsta->timer, jiffies +
1176                                       IEEE80211_RETRY_AUTH_INTERVAL);
1177         }
1178
1179         ieee80211_set_disassoc(sdata, ifsta, false, false, 0);
1180 }
1181
1182
1183 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1184                                          struct ieee80211_if_sta *ifsta,
1185                                          struct ieee80211_mgmt *mgmt,
1186                                          size_t len,
1187                                          int reassoc)
1188 {
1189         struct ieee80211_local *local = sdata->local;
1190         struct ieee80211_supported_band *sband;
1191         struct sta_info *sta;
1192         u64 rates, basic_rates;
1193         u16 capab_info, status_code, aid;
1194         struct ieee802_11_elems elems;
1195         struct ieee80211_bss_conf *bss_conf = &sdata->bss_conf;
1196         u8 *pos;
1197         int i, j;
1198         DECLARE_MAC_BUF(mac);
1199         bool have_higher_than_11mbit = false;
1200
1201         /* AssocResp and ReassocResp have identical structure, so process both
1202          * of them in this function. */
1203
1204         if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATE)
1205                 return;
1206
1207         if (len < 24 + 6)
1208                 return;
1209
1210         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1211                 return;
1212
1213         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1214         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1215         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1216
1217         printk(KERN_DEBUG "%s: RX %sssocResp from %s (capab=0x%x "
1218                "status=%d aid=%d)\n",
1219                sdata->dev->name, reassoc ? "Rea" : "A", print_mac(mac, mgmt->sa),
1220                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1221
1222         if (status_code != WLAN_STATUS_SUCCESS) {
1223                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1224                        sdata->dev->name, status_code);
1225                 /* if this was a reassociation, ensure we try a "full"
1226                  * association next time. This works around some broken APs
1227                  * which do not correctly reject reassociation requests. */
1228                 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1229                 return;
1230         }
1231
1232         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1233                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1234                        "set\n", sdata->dev->name, aid);
1235         aid &= ~(BIT(15) | BIT(14));
1236
1237         pos = mgmt->u.assoc_resp.variable;
1238         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1239
1240         if (!elems.supp_rates) {
1241                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1242                        sdata->dev->name);
1243                 return;
1244         }
1245
1246         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1247         ifsta->aid = aid;
1248         ifsta->ap_capab = capab_info;
1249
1250         kfree(ifsta->assocresp_ies);
1251         ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1252         ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
1253         if (ifsta->assocresp_ies)
1254                 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
1255
1256         rcu_read_lock();
1257
1258         /* Add STA entry for the AP */
1259         sta = sta_info_get(local, ifsta->bssid);
1260         if (!sta) {
1261                 struct ieee80211_bss *bss;
1262                 int err;
1263
1264                 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
1265                 if (!sta) {
1266                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1267                                " the AP\n", sdata->dev->name);
1268                         rcu_read_unlock();
1269                         return;
1270                 }
1271                 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
1272                                            local->hw.conf.channel->center_freq,
1273                                            ifsta->ssid, ifsta->ssid_len);
1274                 if (bss) {
1275                         sta->last_signal = bss->signal;
1276                         sta->last_qual = bss->qual;
1277                         sta->last_noise = bss->noise;
1278                         ieee80211_rx_bss_put(local, bss);
1279                 }
1280
1281                 err = sta_info_insert(sta);
1282                 if (err) {
1283                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1284                                " the AP (error %d)\n", sdata->dev->name, err);
1285                         rcu_read_unlock();
1286                         return;
1287                 }
1288                 /* update new sta with its last rx activity */
1289                 sta->last_rx = jiffies;
1290         }
1291
1292         /*
1293          * FIXME: Do we really need to update the sta_info's information here?
1294          *        We already know about the AP (we found it in our list) so it
1295          *        should already be filled with the right info, no?
1296          *        As is stands, all this is racy because typically we assume
1297          *        the information that is filled in here (except flags) doesn't
1298          *        change while a STA structure is alive. As such, it should move
1299          *        to between the sta_info_alloc() and sta_info_insert() above.
1300          */
1301
1302         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1303                            WLAN_STA_AUTHORIZED);
1304
1305         rates = 0;
1306         basic_rates = 0;
1307         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1308
1309         for (i = 0; i < elems.supp_rates_len; i++) {
1310                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1311
1312                 if (rate > 110)
1313                         have_higher_than_11mbit = true;
1314
1315                 for (j = 0; j < sband->n_bitrates; j++) {
1316                         if (sband->bitrates[j].bitrate == rate)
1317                                 rates |= BIT(j);
1318                         if (elems.supp_rates[i] & 0x80)
1319                                 basic_rates |= BIT(j);
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
1326                 if (rate > 110)
1327                         have_higher_than_11mbit = true;
1328
1329                 for (j = 0; j < sband->n_bitrates; j++) {
1330                         if (sband->bitrates[j].bitrate == rate)
1331                                 rates |= BIT(j);
1332                         if (elems.ext_supp_rates[i] & 0x80)
1333                                 basic_rates |= BIT(j);
1334                 }
1335         }
1336
1337         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1338         sdata->bss_conf.basic_rates = basic_rates;
1339
1340         /* cf. IEEE 802.11 9.2.12 */
1341         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1342             have_higher_than_11mbit)
1343                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1344         else
1345                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1346
1347         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1348             (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
1349                 struct ieee80211_ht_bss_info bss_info;
1350                 ieee80211_ht_cap_ie_to_ht_info(
1351                                 elems.ht_cap_elem, &sta->sta.ht_info);
1352                 ieee80211_ht_addt_info_ie_to_ht_bss_info(
1353                                 elems.ht_info_elem, &bss_info);
1354                 ieee80211_handle_ht(local, 1, &sta->sta.ht_info, &bss_info);
1355         }
1356
1357         rate_control_rate_init(sta);
1358
1359         if (elems.wmm_param) {
1360                 set_sta_flags(sta, WLAN_STA_WME);
1361                 rcu_read_unlock();
1362                 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1363                                          elems.wmm_param_len);
1364         } else
1365                 rcu_read_unlock();
1366
1367         /* set AID and assoc capability,
1368          * ieee80211_set_associated() will tell the driver */
1369         bss_conf->aid = aid;
1370         bss_conf->assoc_capability = capab_info;
1371         ieee80211_set_associated(sdata, ifsta);
1372
1373         ieee80211_associated(sdata, ifsta);
1374 }
1375
1376
1377 static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
1378                                    struct ieee80211_if_sta *ifsta,
1379                                    struct ieee80211_bss *bss)
1380 {
1381         struct ieee80211_local *local = sdata->local;
1382         int res, rates, i, j;
1383         struct sk_buff *skb;
1384         struct ieee80211_mgmt *mgmt;
1385         u8 *pos;
1386         struct ieee80211_supported_band *sband;
1387         union iwreq_data wrqu;
1388
1389         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1390
1391         /* Remove possible STA entries from other IBSS networks. */
1392         sta_info_flush_delayed(sdata);
1393
1394         if (local->ops->reset_tsf) {
1395                 /* Reset own TSF to allow time synchronization work. */
1396                 local->ops->reset_tsf(local_to_hw(local));
1397         }
1398         memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
1399         res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
1400         if (res)
1401                 return res;
1402
1403         local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
1404
1405         sdata->drop_unencrypted = bss->capability &
1406                 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
1407
1408         res = ieee80211_set_freq(sdata, bss->freq);
1409
1410         if (res)
1411                 return res;
1412
1413         /* Build IBSS probe response */
1414         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
1415         if (skb) {
1416                 skb_reserve(skb, local->hw.extra_tx_headroom);
1417
1418                 mgmt = (struct ieee80211_mgmt *)
1419                         skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1420                 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1421                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1422                                                   IEEE80211_STYPE_PROBE_RESP);
1423                 memset(mgmt->da, 0xff, ETH_ALEN);
1424                 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1425                 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1426                 mgmt->u.beacon.beacon_int =
1427                         cpu_to_le16(local->hw.conf.beacon_int);
1428                 mgmt->u.beacon.timestamp = cpu_to_le64(bss->timestamp);
1429                 mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
1430
1431                 pos = skb_put(skb, 2 + ifsta->ssid_len);
1432                 *pos++ = WLAN_EID_SSID;
1433                 *pos++ = ifsta->ssid_len;
1434                 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
1435
1436                 rates = bss->supp_rates_len;
1437                 if (rates > 8)
1438                         rates = 8;
1439                 pos = skb_put(skb, 2 + rates);
1440                 *pos++ = WLAN_EID_SUPP_RATES;
1441                 *pos++ = rates;
1442                 memcpy(pos, bss->supp_rates, rates);
1443
1444                 if (bss->band == IEEE80211_BAND_2GHZ) {
1445                         pos = skb_put(skb, 2 + 1);
1446                         *pos++ = WLAN_EID_DS_PARAMS;
1447                         *pos++ = 1;
1448                         *pos++ = ieee80211_frequency_to_channel(bss->freq);
1449                 }
1450
1451                 pos = skb_put(skb, 2 + 2);
1452                 *pos++ = WLAN_EID_IBSS_PARAMS;
1453                 *pos++ = 2;
1454                 /* FIX: set ATIM window based on scan results */
1455                 *pos++ = 0;
1456                 *pos++ = 0;
1457
1458                 if (bss->supp_rates_len > 8) {
1459                         rates = bss->supp_rates_len - 8;
1460                         pos = skb_put(skb, 2 + rates);
1461                         *pos++ = WLAN_EID_EXT_SUPP_RATES;
1462                         *pos++ = rates;
1463                         memcpy(pos, &bss->supp_rates[8], rates);
1464                 }
1465
1466                 ifsta->probe_resp = skb;
1467
1468                 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
1469         }
1470
1471         rates = 0;
1472         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1473         for (i = 0; i < bss->supp_rates_len; i++) {
1474                 int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
1475                 for (j = 0; j < sband->n_bitrates; j++)
1476                         if (sband->bitrates[j].bitrate == bitrate)
1477                                 rates |= BIT(j);
1478         }
1479         ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
1480
1481         ieee80211_sta_def_wmm_params(sdata, bss);
1482
1483         ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED;
1484         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1485
1486         ieee80211_led_assoc(local, true);
1487
1488         memset(&wrqu, 0, sizeof(wrqu));
1489         memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
1490         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
1491
1492         return res;
1493 }
1494
1495 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1496                                   struct ieee80211_mgmt *mgmt,
1497                                   size_t len,
1498                                   struct ieee80211_rx_status *rx_status,
1499                                   struct ieee802_11_elems *elems,
1500                                   bool beacon)
1501 {
1502         struct ieee80211_local *local = sdata->local;
1503         int freq;
1504         struct ieee80211_bss *bss;
1505         struct sta_info *sta;
1506         struct ieee80211_channel *channel;
1507         u64 beacon_timestamp, rx_timestamp;
1508         u64 supp_rates = 0;
1509         enum ieee80211_band band = rx_status->band;
1510         DECLARE_MAC_BUF(mac);
1511         DECLARE_MAC_BUF(mac2);
1512
1513         if (elems->ds_params && elems->ds_params_len == 1)
1514                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1515         else
1516                 freq = rx_status->freq;
1517
1518         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1519
1520         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1521                 return;
1522
1523         if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
1524             memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
1525                 supp_rates = ieee80211_sta_get_rates(local, elems, band);
1526
1527                 rcu_read_lock();
1528
1529                 sta = sta_info_get(local, mgmt->sa);
1530                 if (sta) {
1531                         u64 prev_rates;
1532
1533                         prev_rates = sta->sta.supp_rates[band];
1534                         /* make sure mandatory rates are always added */
1535                         sta->sta.supp_rates[band] = supp_rates |
1536                                 ieee80211_mandatory_rates(local, band);
1537
1538 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1539                         if (sta->sta.supp_rates[band] != prev_rates)
1540                                 printk(KERN_DEBUG "%s: updated supp_rates set "
1541                                     "for %s based on beacon info (0x%llx | "
1542                                     "0x%llx -> 0x%llx)\n",
1543                                     sdata->dev->name,
1544                                     print_mac(mac, sta->sta.addr),
1545                                     (unsigned long long) prev_rates,
1546                                     (unsigned long long) supp_rates,
1547                                     (unsigned long long) sta->sta.supp_rates[band]);
1548 #endif
1549                 } else {
1550                         ieee80211_ibss_add_sta(sdata, NULL, mgmt->bssid,
1551                                                mgmt->sa, supp_rates);
1552                 }
1553
1554                 rcu_read_unlock();
1555         }
1556
1557         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1558                                         freq, beacon);
1559         if (!bss)
1560                 return;
1561
1562         /* was just updated in ieee80211_bss_info_update */
1563         beacon_timestamp = bss->timestamp;
1564
1565         /*
1566          * In STA mode, the remaining parameters should not be overridden
1567          * by beacons because they're not necessarily accurate there.
1568          */
1569         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1570             bss->last_probe_resp && beacon) {
1571                 ieee80211_rx_bss_put(local, bss);
1572                 return;
1573         }
1574
1575         /* check if we need to merge IBSS */
1576         if (sdata->vif.type == NL80211_IFTYPE_ADHOC && beacon &&
1577             bss->capability & WLAN_CAPABILITY_IBSS &&
1578             bss->freq == local->oper_channel->center_freq &&
1579             elems->ssid_len == sdata->u.sta.ssid_len &&
1580             memcmp(elems->ssid, sdata->u.sta.ssid,
1581                                 sdata->u.sta.ssid_len) == 0) {
1582                 if (rx_status->flag & RX_FLAG_TSFT) {
1583                         /* in order for correct IBSS merging we need mactime
1584                          *
1585                          * since mactime is defined as the time the first data
1586                          * symbol of the frame hits the PHY, and the timestamp
1587                          * of the beacon is defined as "the time that the data
1588                          * symbol containing the first bit of the timestamp is
1589                          * transmitted to the PHY plus the transmitting STA’s
1590                          * delays through its local PHY from the MAC-PHY
1591                          * interface to its interface with the WM"
1592                          * (802.11 11.1.2) - equals the time this bit arrives at
1593                          * the receiver - we have to take into account the
1594                          * offset between the two.
1595                          * e.g: at 1 MBit that means mactime is 192 usec earlier
1596                          * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
1597                          */
1598                         int rate = local->hw.wiphy->bands[band]->
1599                                         bitrates[rx_status->rate_idx].bitrate;
1600                         rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
1601                 } else if (local && local->ops && local->ops->get_tsf)
1602                         /* second best option: get current TSF */
1603                         rx_timestamp = local->ops->get_tsf(local_to_hw(local));
1604                 else
1605                         /* can't merge without knowing the TSF */
1606                         rx_timestamp = -1LLU;
1607 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1608                 printk(KERN_DEBUG "RX beacon SA=%s BSSID="
1609                        "%s TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1610                        print_mac(mac, mgmt->sa),
1611                        print_mac(mac2, mgmt->bssid),
1612                        (unsigned long long)rx_timestamp,
1613                        (unsigned long long)beacon_timestamp,
1614                        (unsigned long long)(rx_timestamp - beacon_timestamp),
1615                        jiffies);
1616 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1617                 if (beacon_timestamp > rx_timestamp) {
1618 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1619                         printk(KERN_DEBUG "%s: beacon TSF higher than "
1620                                "local TSF - IBSS merge with BSSID %s\n",
1621                                sdata->dev->name, print_mac(mac, mgmt->bssid));
1622 #endif
1623                         ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss);
1624                         ieee80211_ibss_add_sta(sdata, NULL,
1625                                                mgmt->bssid, mgmt->sa,
1626                                                supp_rates);
1627                 }
1628         }
1629
1630         ieee80211_rx_bss_put(local, bss);
1631 }
1632
1633
1634 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1635                                          struct ieee80211_mgmt *mgmt,
1636                                          size_t len,
1637                                          struct ieee80211_rx_status *rx_status)
1638 {
1639         size_t baselen;
1640         struct ieee802_11_elems elems;
1641         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1642
1643         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1644                 return; /* ignore ProbeResp to foreign address */
1645
1646         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1647         if (baselen > len)
1648                 return;
1649
1650         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1651                                 &elems);
1652
1653         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1654
1655         /* direct probe may be part of the association flow */
1656         if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1657                                                         &ifsta->request)) {
1658                 printk(KERN_DEBUG "%s direct probe responded\n",
1659                        sdata->dev->name);
1660                 ieee80211_authenticate(sdata, ifsta);
1661         }
1662 }
1663
1664
1665 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1666                                      struct ieee80211_mgmt *mgmt,
1667                                      size_t len,
1668                                      struct ieee80211_rx_status *rx_status)
1669 {
1670         struct ieee80211_if_sta *ifsta;
1671         size_t baselen;
1672         struct ieee802_11_elems elems;
1673         struct ieee80211_local *local = sdata->local;
1674         struct ieee80211_conf *conf = &local->hw.conf;
1675         u32 changed = 0;
1676
1677         /* Process beacon from the current BSS */
1678         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1679         if (baselen > len)
1680                 return;
1681
1682         ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1683
1684         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1685
1686         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1687                 return;
1688         ifsta = &sdata->u.sta;
1689
1690         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
1691             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1692                 return;
1693
1694         ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1695                                  elems.wmm_param_len);
1696
1697         if (elems.erp_info && elems.erp_info_len >= 1)
1698                 changed |= ieee80211_handle_erp_ie(sdata, elems.erp_info[0]);
1699         else {
1700                 u16 capab = le16_to_cpu(mgmt->u.beacon.capab_info);
1701                 changed |= ieee80211_handle_protect_preamb(sdata, false,
1702                                 (capab & WLAN_CAPABILITY_SHORT_PREAMBLE) != 0);
1703         }
1704
1705         if (elems.ht_cap_elem && elems.ht_info_elem &&
1706             elems.wmm_param && conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) {
1707                 struct ieee80211_ht_bss_info bss_info;
1708
1709                 ieee80211_ht_addt_info_ie_to_ht_bss_info(
1710                                 elems.ht_info_elem, &bss_info);
1711                 changed |= ieee80211_handle_ht(local, 1, &conf->ht_conf,
1712                                                &bss_info);
1713         }
1714
1715         ieee80211_bss_info_change_notify(sdata, changed);
1716 }
1717
1718
1719 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1720                                         struct ieee80211_if_sta *ifsta,
1721                                         struct ieee80211_mgmt *mgmt,
1722                                         size_t len,
1723                                         struct ieee80211_rx_status *rx_status)
1724 {
1725         struct ieee80211_local *local = sdata->local;
1726         int tx_last_beacon;
1727         struct sk_buff *skb;
1728         struct ieee80211_mgmt *resp;
1729         u8 *pos, *end;
1730         DECLARE_MAC_BUF(mac);
1731 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1732         DECLARE_MAC_BUF(mac2);
1733         DECLARE_MAC_BUF(mac3);
1734 #endif
1735
1736         if (sdata->vif.type != NL80211_IFTYPE_ADHOC ||
1737             ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED ||
1738             len < 24 + 2 || !ifsta->probe_resp)
1739                 return;
1740
1741         if (local->ops->tx_last_beacon)
1742                 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
1743         else
1744                 tx_last_beacon = 1;
1745
1746 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1747         printk(KERN_DEBUG "%s: RX ProbeReq SA=%s DA=%s BSSID="
1748                "%s (tx_last_beacon=%d)\n",
1749                sdata->dev->name, print_mac(mac, mgmt->sa), print_mac(mac2, mgmt->da),
1750                print_mac(mac3, mgmt->bssid), tx_last_beacon);
1751 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1752
1753         if (!tx_last_beacon)
1754                 return;
1755
1756         if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
1757             memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
1758                 return;
1759
1760         end = ((u8 *) mgmt) + len;
1761         pos = mgmt->u.probe_req.variable;
1762         if (pos[0] != WLAN_EID_SSID ||
1763             pos + 2 + pos[1] > end) {
1764 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1765                 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
1766                        "from %s\n",
1767                        sdata->dev->name, print_mac(mac, mgmt->sa));
1768 #endif
1769                 return;
1770         }
1771         if (pos[1] != 0 &&
1772             (pos[1] != ifsta->ssid_len ||
1773              memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
1774                 /* Ignore ProbeReq for foreign SSID */
1775                 return;
1776         }
1777
1778         /* Reply with ProbeResp */
1779         skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
1780         if (!skb)
1781                 return;
1782
1783         resp = (struct ieee80211_mgmt *) skb->data;
1784         memcpy(resp->da, mgmt->sa, ETH_ALEN);
1785 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1786         printk(KERN_DEBUG "%s: Sending ProbeResp to %s\n",
1787                sdata->dev->name, print_mac(mac, resp->da));
1788 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1789         ieee80211_tx_skb(sdata, skb, 0);
1790 }
1791
1792 void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
1793                            struct ieee80211_rx_status *rx_status)
1794 {
1795         struct ieee80211_local *local = sdata->local;
1796         struct ieee80211_if_sta *ifsta;
1797         struct ieee80211_mgmt *mgmt;
1798         u16 fc;
1799
1800         if (skb->len < 24)
1801                 goto fail;
1802
1803         ifsta = &sdata->u.sta;
1804
1805         mgmt = (struct ieee80211_mgmt *) skb->data;
1806         fc = le16_to_cpu(mgmt->frame_control);
1807
1808         switch (fc & IEEE80211_FCTL_STYPE) {
1809         case IEEE80211_STYPE_PROBE_REQ:
1810         case IEEE80211_STYPE_PROBE_RESP:
1811         case IEEE80211_STYPE_BEACON:
1812                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1813         case IEEE80211_STYPE_AUTH:
1814         case IEEE80211_STYPE_ASSOC_RESP:
1815         case IEEE80211_STYPE_REASSOC_RESP:
1816         case IEEE80211_STYPE_DEAUTH:
1817         case IEEE80211_STYPE_DISASSOC:
1818                 skb_queue_tail(&ifsta->skb_queue, skb);
1819                 queue_work(local->hw.workqueue, &ifsta->work);
1820                 return;
1821         }
1822
1823  fail:
1824         kfree_skb(skb);
1825 }
1826
1827 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1828                                          struct sk_buff *skb)
1829 {
1830         struct ieee80211_rx_status *rx_status;
1831         struct ieee80211_if_sta *ifsta;
1832         struct ieee80211_mgmt *mgmt;
1833         u16 fc;
1834
1835         ifsta = &sdata->u.sta;
1836
1837         rx_status = (struct ieee80211_rx_status *) skb->cb;
1838         mgmt = (struct ieee80211_mgmt *) skb->data;
1839         fc = le16_to_cpu(mgmt->frame_control);
1840
1841         switch (fc & IEEE80211_FCTL_STYPE) {
1842         case IEEE80211_STYPE_PROBE_REQ:
1843                 ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len,
1844                                             rx_status);
1845                 break;
1846         case IEEE80211_STYPE_PROBE_RESP:
1847                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
1848                 break;
1849         case IEEE80211_STYPE_BEACON:
1850                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
1851                 break;
1852         case IEEE80211_STYPE_AUTH:
1853                 ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len);
1854                 break;
1855         case IEEE80211_STYPE_ASSOC_RESP:
1856                 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
1857                 break;
1858         case IEEE80211_STYPE_REASSOC_RESP:
1859                 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
1860                 break;
1861         case IEEE80211_STYPE_DEAUTH:
1862                 ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len);
1863                 break;
1864         case IEEE80211_STYPE_DISASSOC:
1865                 ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len);
1866                 break;
1867         }
1868
1869         kfree_skb(skb);
1870 }
1871
1872
1873 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
1874 {
1875         struct ieee80211_local *local = sdata->local;
1876         int active = 0;
1877         struct sta_info *sta;
1878
1879         rcu_read_lock();
1880
1881         list_for_each_entry_rcu(sta, &local->sta_list, list) {
1882                 if (sta->sdata == sdata &&
1883                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
1884                                jiffies)) {
1885                         active++;
1886                         break;
1887                 }
1888         }
1889
1890         rcu_read_unlock();
1891
1892         return active;
1893 }
1894
1895
1896 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
1897                                      struct ieee80211_if_sta *ifsta)
1898 {
1899         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1900
1901         ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
1902         if (ieee80211_sta_active_ibss(sdata))
1903                 return;
1904
1905         printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
1906                "IBSS networks with same SSID (merge)\n", sdata->dev->name);
1907         ieee80211_request_scan(sdata, ifsta->ssid, ifsta->ssid_len);
1908 }
1909
1910
1911 static void ieee80211_sta_timer(unsigned long data)
1912 {
1913         struct ieee80211_sub_if_data *sdata =
1914                 (struct ieee80211_sub_if_data *) data;
1915         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1916         struct ieee80211_local *local = sdata->local;
1917
1918         set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
1919         queue_work(local->hw.workqueue, &ifsta->work);
1920 }
1921
1922 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata,
1923                                      struct ieee80211_if_sta *ifsta)
1924 {
1925         struct ieee80211_local *local = sdata->local;
1926
1927         if (local->ops->reset_tsf) {
1928                 /* Reset own TSF to allow time synchronization work. */
1929                 local->ops->reset_tsf(local_to_hw(local));
1930         }
1931
1932         ifsta->wmm_last_param_set = -1; /* allow any WMM update */
1933
1934
1935         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1936                 ifsta->auth_alg = WLAN_AUTH_OPEN;
1937         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1938                 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
1939         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1940                 ifsta->auth_alg = WLAN_AUTH_LEAP;
1941         else
1942                 ifsta->auth_alg = WLAN_AUTH_OPEN;
1943         ifsta->auth_transaction = -1;
1944         ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
1945         ifsta->assoc_scan_tries = 0;
1946         ifsta->direct_probe_tries = 0;
1947         ifsta->auth_tries = 0;
1948         ifsta->assoc_tries = 0;
1949         netif_tx_stop_all_queues(sdata->dev);
1950         netif_carrier_off(sdata->dev);
1951 }
1952
1953
1954 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
1955                                     const char *ssid, int ssid_len)
1956 {
1957         int tmp, hidden_ssid;
1958
1959         if (ssid_len == ifsta->ssid_len &&
1960             !memcmp(ifsta->ssid, ssid, ssid_len))
1961                 return 1;
1962
1963         if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
1964                 return 0;
1965
1966         hidden_ssid = 1;
1967         tmp = ssid_len;
1968         while (tmp--) {
1969                 if (ssid[tmp] != '\0') {
1970                         hidden_ssid = 0;
1971                         break;
1972                 }
1973         }
1974
1975         if (hidden_ssid && ifsta->ssid_len == ssid_len)
1976                 return 1;
1977
1978         if (ssid_len == 1 && ssid[0] == ' ')
1979                 return 1;
1980
1981         return 0;
1982 }
1983
1984 static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata,
1985                                      struct ieee80211_if_sta *ifsta)
1986 {
1987         struct ieee80211_local *local = sdata->local;
1988         struct ieee80211_bss *bss;
1989         struct ieee80211_supported_band *sband;
1990         u8 bssid[ETH_ALEN], *pos;
1991         int i;
1992         int ret;
1993         DECLARE_MAC_BUF(mac);
1994
1995 #if 0
1996         /* Easier testing, use fixed BSSID. */
1997         memset(bssid, 0xfe, ETH_ALEN);
1998 #else
1999         /* Generate random, not broadcast, locally administered BSSID. Mix in
2000          * own MAC address to make sure that devices that do not have proper
2001          * random number generator get different BSSID. */
2002         get_random_bytes(bssid, ETH_ALEN);
2003         for (i = 0; i < ETH_ALEN; i++)
2004                 bssid[i] ^= sdata->dev->dev_addr[i];
2005         bssid[0] &= ~0x01;
2006         bssid[0] |= 0x02;
2007 #endif
2008
2009         printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %s\n",
2010                sdata->dev->name, print_mac(mac, bssid));
2011
2012         bss = ieee80211_rx_bss_add(local, bssid,
2013                                    local->hw.conf.channel->center_freq,
2014                                    sdata->u.sta.ssid, sdata->u.sta.ssid_len);
2015         if (!bss)
2016                 return -ENOMEM;
2017
2018         bss->band = local->hw.conf.channel->band;
2019         sband = local->hw.wiphy->bands[bss->band];
2020
2021         if (local->hw.conf.beacon_int == 0)
2022                 local->hw.conf.beacon_int = 100;
2023         bss->beacon_int = local->hw.conf.beacon_int;
2024         bss->last_update = jiffies;
2025         bss->capability = WLAN_CAPABILITY_IBSS;
2026
2027         if (sdata->default_key)
2028                 bss->capability |= WLAN_CAPABILITY_PRIVACY;
2029         else
2030                 sdata->drop_unencrypted = 0;
2031
2032         bss->supp_rates_len = sband->n_bitrates;
2033         pos = bss->supp_rates;
2034         for (i = 0; i < sband->n_bitrates; i++) {
2035                 int rate = sband->bitrates[i].bitrate;
2036                 *pos++ = (u8) (rate / 5);
2037         }
2038
2039         ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2040         ieee80211_rx_bss_put(local, bss);
2041         return ret;
2042 }
2043
2044
2045 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
2046                                    struct ieee80211_if_sta *ifsta)
2047 {
2048         struct ieee80211_local *local = sdata->local;
2049         struct ieee80211_bss *bss;
2050         int found = 0;
2051         u8 bssid[ETH_ALEN];
2052         int active_ibss;
2053         DECLARE_MAC_BUF(mac);
2054         DECLARE_MAC_BUF(mac2);
2055
2056         if (ifsta->ssid_len == 0)
2057                 return -EINVAL;
2058
2059         active_ibss = ieee80211_sta_active_ibss(sdata);
2060 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2061         printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
2062                sdata->dev->name, active_ibss);
2063 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2064         spin_lock_bh(&local->bss_lock);
2065         list_for_each_entry(bss, &local->bss_list, list) {
2066                 if (ifsta->ssid_len != bss->ssid_len ||
2067                     memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
2068                     || !(bss->capability & WLAN_CAPABILITY_IBSS))
2069                         continue;
2070 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2071                 printk(KERN_DEBUG "   bssid=%s found\n",
2072                        print_mac(mac, bss->bssid));
2073 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2074                 memcpy(bssid, bss->bssid, ETH_ALEN);
2075                 found = 1;
2076                 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
2077                         break;
2078         }
2079         spin_unlock_bh(&local->bss_lock);
2080
2081 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2082         if (found)
2083                 printk(KERN_DEBUG "   sta_find_ibss: selected %s current "
2084                        "%s\n", print_mac(mac, bssid),
2085                        print_mac(mac2, ifsta->bssid));
2086 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2087
2088         if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2089                 int ret;
2090                 int search_freq;
2091
2092                 if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2093                         search_freq = bss->freq;
2094                 else
2095                         search_freq = local->hw.conf.channel->center_freq;
2096
2097                 bss = ieee80211_rx_bss_get(local, bssid, search_freq,
2098                                            ifsta->ssid, ifsta->ssid_len);
2099                 if (!bss)
2100                         goto dont_join;
2101
2102                 printk(KERN_DEBUG "%s: Selected IBSS BSSID %s"
2103                        " based on configured SSID\n",
2104                        sdata->dev->name, print_mac(mac, bssid));
2105                 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2106                 ieee80211_rx_bss_put(local, bss);
2107                 return ret;
2108         }
2109
2110 dont_join:
2111 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2112         printk(KERN_DEBUG "   did not try to join ibss\n");
2113 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2114
2115         /* Selected IBSS not found in current scan results - try to scan */
2116         if (ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED &&
2117             !ieee80211_sta_active_ibss(sdata)) {
2118                 mod_timer(&ifsta->timer, jiffies +
2119                                       IEEE80211_IBSS_MERGE_INTERVAL);
2120         } else if (time_after(jiffies, local->last_scan_completed +
2121                               IEEE80211_SCAN_INTERVAL)) {
2122                 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
2123                        "join\n", sdata->dev->name);
2124                 return ieee80211_request_scan(sdata, ifsta->ssid,
2125                                               ifsta->ssid_len);
2126         } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) {
2127                 int interval = IEEE80211_SCAN_INTERVAL;
2128
2129                 if (time_after(jiffies, ifsta->ibss_join_req +
2130                                IEEE80211_IBSS_JOIN_TIMEOUT)) {
2131                         if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
2132                             (!(local->oper_channel->flags &
2133                                         IEEE80211_CHAN_NO_IBSS)))
2134                                 return ieee80211_sta_create_ibss(sdata, ifsta);
2135                         if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
2136                                 printk(KERN_DEBUG "%s: IBSS not allowed on"
2137                                        " %d MHz\n", sdata->dev->name,
2138                                        local->hw.conf.channel->center_freq);
2139                         }
2140
2141                         /* No IBSS found - decrease scan interval and continue
2142                          * scanning. */
2143                         interval = IEEE80211_SCAN_INTERVAL_SLOW;
2144                 }
2145
2146                 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2147                 mod_timer(&ifsta->timer, jiffies + interval);
2148                 return 0;
2149         }
2150
2151         return 0;
2152 }
2153
2154
2155 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
2156                                      struct ieee80211_if_sta *ifsta)
2157 {
2158         struct ieee80211_local *local = sdata->local;
2159         struct ieee80211_bss *bss, *selected = NULL;
2160         int top_rssi = 0, freq;
2161
2162         spin_lock_bh(&local->bss_lock);
2163         freq = local->oper_channel->center_freq;
2164         list_for_each_entry(bss, &local->bss_list, list) {
2165                 if (!(bss->capability & WLAN_CAPABILITY_ESS))
2166                         continue;
2167
2168                 if ((ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2169                         IEEE80211_STA_AUTO_BSSID_SEL |
2170                         IEEE80211_STA_AUTO_CHANNEL_SEL)) &&
2171                     (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
2172                      !!sdata->default_key))
2173                         continue;
2174
2175                 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
2176                     bss->freq != freq)
2177                         continue;
2178
2179                 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
2180                     memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
2181                         continue;
2182
2183                 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
2184                     !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
2185                         continue;
2186
2187                 if (!selected || top_rssi < bss->signal) {
2188                         selected = bss;
2189                         top_rssi = bss->signal;
2190                 }
2191         }
2192         if (selected)
2193                 atomic_inc(&selected->users);
2194         spin_unlock_bh(&local->bss_lock);
2195
2196         if (selected) {
2197                 ieee80211_set_freq(sdata, selected->freq);
2198                 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
2199                         ieee80211_sta_set_ssid(sdata, selected->ssid,
2200                                                selected->ssid_len);
2201                 ieee80211_sta_set_bssid(sdata, selected->bssid);
2202                 ieee80211_sta_def_wmm_params(sdata, selected);
2203
2204                 /* Send out direct probe if no probe resp was received or
2205                  * the one we have is outdated
2206                  */
2207                 if (!selected->last_probe_resp ||
2208                     time_after(jiffies, selected->last_probe_resp
2209                                         + IEEE80211_SCAN_RESULT_EXPIRE))
2210                         ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2211                 else
2212                         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2213
2214                 ieee80211_rx_bss_put(local, selected);
2215                 ieee80211_sta_reset_auth(sdata, ifsta);
2216                 return 0;
2217         } else {
2218                 if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2219                         ifsta->assoc_scan_tries++;
2220                         if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
2221                                 ieee80211_start_scan(sdata, NULL, 0);
2222                         else
2223                                 ieee80211_start_scan(sdata, ifsta->ssid,
2224                                                          ifsta->ssid_len);
2225                         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2226                         set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2227                 } else
2228                         ifsta->state = IEEE80211_STA_MLME_DISABLED;
2229         }
2230         return -1;
2231 }
2232
2233
2234 static void ieee80211_sta_work(struct work_struct *work)
2235 {
2236         struct ieee80211_sub_if_data *sdata =
2237                 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
2238         struct ieee80211_local *local = sdata->local;
2239         struct ieee80211_if_sta *ifsta;
2240         struct sk_buff *skb;
2241
2242         if (!netif_running(sdata->dev))
2243                 return;
2244
2245         if (local->sw_scanning || local->hw_scanning)
2246                 return;
2247
2248         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION &&
2249                     sdata->vif.type != NL80211_IFTYPE_ADHOC))
2250                 return;
2251         ifsta = &sdata->u.sta;
2252
2253         while ((skb = skb_dequeue(&ifsta->skb_queue)))
2254                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2255
2256         if (ifsta->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2257             ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2258             ifsta->state != IEEE80211_STA_MLME_ASSOCIATE &&
2259             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
2260                 ieee80211_start_scan(sdata, ifsta->scan_ssid,
2261                                      ifsta->scan_ssid_len);
2262                 return;
2263         }
2264
2265         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
2266                 if (ieee80211_sta_config_auth(sdata, ifsta))
2267                         return;
2268                 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2269         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
2270                 return;
2271
2272         switch (ifsta->state) {
2273         case IEEE80211_STA_MLME_DISABLED:
2274                 break;
2275         case IEEE80211_STA_MLME_DIRECT_PROBE:
2276                 ieee80211_direct_probe(sdata, ifsta);
2277                 break;
2278         case IEEE80211_STA_MLME_AUTHENTICATE:
2279                 ieee80211_authenticate(sdata, ifsta);
2280                 break;
2281         case IEEE80211_STA_MLME_ASSOCIATE:
2282                 ieee80211_associate(sdata, ifsta);
2283                 break;
2284         case IEEE80211_STA_MLME_ASSOCIATED:
2285                 ieee80211_associated(sdata, ifsta);
2286                 break;
2287         case IEEE80211_STA_MLME_IBSS_SEARCH:
2288                 ieee80211_sta_find_ibss(sdata, ifsta);
2289                 break;
2290         case IEEE80211_STA_MLME_IBSS_JOINED:
2291                 ieee80211_sta_merge_ibss(sdata, ifsta);
2292                 break;
2293         default:
2294                 WARN_ON(1);
2295                 break;
2296         }
2297
2298         if (ieee80211_privacy_mismatch(sdata, ifsta)) {
2299                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2300                        "mixed-cell disabled - disassociate\n", sdata->dev->name);
2301
2302                 ieee80211_set_disassoc(sdata, ifsta, false, true,
2303                                         WLAN_REASON_UNSPECIFIED);
2304         }
2305 }
2306
2307 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2308 {
2309         if (sdata->vif.type == NL80211_IFTYPE_STATION)
2310                 queue_work(sdata->local->hw.workqueue,
2311                            &sdata->u.sta.work);
2312 }
2313
2314 /* interface setup */
2315 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2316 {
2317         struct ieee80211_if_sta *ifsta;
2318
2319         ifsta = &sdata->u.sta;
2320         INIT_WORK(&ifsta->work, ieee80211_sta_work);
2321         setup_timer(&ifsta->timer, ieee80211_sta_timer,
2322                     (unsigned long) sdata);
2323         skb_queue_head_init(&ifsta->skb_queue);
2324
2325         ifsta->capab = WLAN_CAPABILITY_ESS;
2326         ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2327                 IEEE80211_AUTH_ALG_SHARED_KEY;
2328         ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
2329                 IEEE80211_STA_AUTO_BSSID_SEL |
2330                 IEEE80211_STA_AUTO_CHANNEL_SEL;
2331         if (ieee80211_num_regular_queues(&sdata->local->hw) >= 4)
2332                 ifsta->flags |= IEEE80211_STA_WMM_ENABLED;
2333 }
2334
2335 /*
2336  * Add a new IBSS station, will also be called by the RX code when,
2337  * in IBSS mode, receiving a frame from a yet-unknown station, hence
2338  * must be callable in atomic context.
2339  */
2340 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
2341                                         struct sk_buff *skb, u8 *bssid,
2342                                         u8 *addr, u64 supp_rates)
2343 {
2344         struct ieee80211_local *local = sdata->local;
2345         struct sta_info *sta;
2346         DECLARE_MAC_BUF(mac);
2347         int band = local->hw.conf.channel->band;
2348
2349         /* TODO: Could consider removing the least recently used entry and
2350          * allow new one to be added. */
2351         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
2352                 if (net_ratelimit()) {
2353                         printk(KERN_DEBUG "%s: No room for a new IBSS STA "
2354                                "entry %s\n", sdata->dev->name, print_mac(mac, addr));
2355                 }
2356                 return NULL;
2357         }
2358
2359         if (compare_ether_addr(bssid, sdata->u.sta.bssid))
2360                 return NULL;
2361
2362 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2363         printk(KERN_DEBUG "%s: Adding new IBSS station %s (dev=%s)\n",
2364                wiphy_name(local->hw.wiphy), print_mac(mac, addr), sdata->dev->name);
2365 #endif
2366
2367         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
2368         if (!sta)
2369                 return NULL;
2370
2371         set_sta_flags(sta, WLAN_STA_AUTHORIZED);
2372
2373         /* make sure mandatory rates are always added */
2374         sta->sta.supp_rates[band] = supp_rates |
2375                         ieee80211_mandatory_rates(local, band);
2376
2377         rate_control_rate_init(sta);
2378
2379         if (sta_info_insert(sta))
2380                 return NULL;
2381
2382         return sta;
2383 }
2384
2385 /* configuration hooks */
2386 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata,
2387                             struct ieee80211_if_sta *ifsta)
2388 {
2389         struct ieee80211_local *local = sdata->local;
2390
2391         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2392                 return;
2393
2394         if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
2395                              IEEE80211_STA_AUTO_BSSID_SEL)) &&
2396             (ifsta->flags & (IEEE80211_STA_SSID_SET |
2397                              IEEE80211_STA_AUTO_SSID_SEL))) {
2398
2399                 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED)
2400                         ieee80211_set_disassoc(sdata, ifsta, true, true,
2401                                                WLAN_REASON_DEAUTH_LEAVING);
2402
2403                 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2404                 queue_work(local->hw.workqueue, &ifsta->work);
2405         }
2406 }
2407
2408 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2409 {
2410         struct ieee80211_if_sta *ifsta;
2411         int res;
2412
2413         if (len > IEEE80211_MAX_SSID_LEN)
2414                 return -EINVAL;
2415
2416         ifsta = &sdata->u.sta;
2417
2418         if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) {
2419                 memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
2420                 memcpy(ifsta->ssid, ssid, len);
2421                 ifsta->ssid_len = len;
2422                 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2423
2424                 res = 0;
2425                 /*
2426                  * Hack! MLME code needs to be cleaned up to have different
2427                  * entry points for configuration and internal selection change
2428                  */
2429                 if (netif_running(sdata->dev))
2430                         res = ieee80211_if_config(sdata, IEEE80211_IFCC_SSID);
2431                 if (res) {
2432                         printk(KERN_DEBUG "%s: Failed to config new SSID to "
2433                                "the low-level driver\n", sdata->dev->name);
2434                         return res;
2435                 }
2436         }
2437
2438         if (len)
2439                 ifsta->flags |= IEEE80211_STA_SSID_SET;
2440         else
2441                 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
2442
2443         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
2444             !(ifsta->flags & IEEE80211_STA_BSSID_SET)) {
2445                 ifsta->ibss_join_req = jiffies;
2446                 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2447                 return ieee80211_sta_find_ibss(sdata, ifsta);
2448         }
2449
2450         return 0;
2451 }
2452
2453 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2454 {
2455         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2456         memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
2457         *len = ifsta->ssid_len;
2458         return 0;
2459 }
2460
2461 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2462 {
2463         struct ieee80211_if_sta *ifsta;
2464         int res;
2465
2466         ifsta = &sdata->u.sta;
2467
2468         if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2469                 memcpy(ifsta->bssid, bssid, ETH_ALEN);
2470                 res = 0;
2471                 /*
2472                  * Hack! See also ieee80211_sta_set_ssid.
2473                  */
2474                 if (netif_running(sdata->dev))
2475                         res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
2476                 if (res) {
2477                         printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2478                                "the low-level driver\n", sdata->dev->name);
2479                         return res;
2480                 }
2481         }
2482
2483         if (is_valid_ether_addr(bssid))
2484                 ifsta->flags |= IEEE80211_STA_BSSID_SET;
2485         else
2486                 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
2487
2488         return 0;
2489 }
2490
2491 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
2492 {
2493         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2494
2495         kfree(ifsta->extra_ie);
2496         if (len == 0) {
2497                 ifsta->extra_ie = NULL;
2498                 ifsta->extra_ie_len = 0;
2499                 return 0;
2500         }
2501         ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
2502         if (!ifsta->extra_ie) {
2503                 ifsta->extra_ie_len = 0;
2504                 return -ENOMEM;
2505         }
2506         memcpy(ifsta->extra_ie, ie, len);
2507         ifsta->extra_ie_len = len;
2508         return 0;
2509 }
2510
2511 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2512 {
2513         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2514
2515         printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2516                sdata->dev->name, reason);
2517
2518         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2519             sdata->vif.type != NL80211_IFTYPE_ADHOC)
2520                 return -EINVAL;
2521
2522         ieee80211_set_disassoc(sdata, ifsta, true, true, reason);
2523         return 0;
2524 }
2525
2526 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2527 {
2528         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2529
2530         printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2531                sdata->dev->name, reason);
2532
2533         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2534                 return -EINVAL;
2535
2536         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
2537                 return -1;
2538
2539         ieee80211_set_disassoc(sdata, ifsta, false, true, reason);
2540         return 0;
2541 }
2542
2543 /* scan finished notification */
2544 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2545 {
2546         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2547         struct ieee80211_if_sta *ifsta;
2548
2549         if (sdata && sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2550                 ifsta = &sdata->u.sta;
2551                 if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) ||
2552                     (!(ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED) &&
2553                     !ieee80211_sta_active_ibss(sdata)))
2554                         ieee80211_sta_find_ibss(sdata, ifsta);
2555         }
2556
2557         /* Restart STA timers */
2558         rcu_read_lock();
2559         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2560                 ieee80211_restart_sta_timer(sdata);
2561         rcu_read_unlock();
2562 }
2563
2564 /* driver notification call */
2565 void ieee80211_notify_mac(struct ieee80211_hw *hw,
2566                           enum ieee80211_notification_types  notif_type)
2567 {
2568         struct ieee80211_local *local = hw_to_local(hw);
2569         struct ieee80211_sub_if_data *sdata;
2570
2571         switch (notif_type) {
2572         case IEEE80211_NOTIFY_RE_ASSOC:
2573                 rtnl_lock();
2574                 list_for_each_entry(sdata, &local->interfaces, list) {
2575                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2576                                 continue;
2577
2578                         ieee80211_sta_req_auth(sdata, &sdata->u.sta);
2579                 }
2580                 rtnl_unlock();
2581                 break;
2582         }
2583 }
2584 EXPORT_SYMBOL(ieee80211_notify_mac);