mac80211: BSS info: check channel first
[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 /* TODO:
15  * order BSS list by RSSI(?) ("quality of AP")
16  * scan result table filtering (by capability (privacy, IBSS/BSS, WPA/RSN IE,
17  *    SSID)
18  */
19 #include <linux/delay.h>
20 #include <linux/if_ether.h>
21 #include <linux/skbuff.h>
22 #include <linux/netdevice.h>
23 #include <linux/if_arp.h>
24 #include <linux/wireless.h>
25 #include <linux/random.h>
26 #include <linux/etherdevice.h>
27 #include <linux/rtnetlink.h>
28 #include <net/iw_handler.h>
29 #include <asm/types.h>
30
31 #include <net/mac80211.h>
32 #include "ieee80211_i.h"
33 #include "rate.h"
34 #include "led.h"
35 #include "mesh.h"
36
37 #define IEEE80211_ASSOC_SCANS_MAX_TRIES 2
38 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
39 #define IEEE80211_AUTH_MAX_TRIES 3
40 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
41 #define IEEE80211_ASSOC_MAX_TRIES 3
42 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
43 #define IEEE80211_MESH_HOUSEKEEPING_INTERVAL (60 * HZ)
44 #define IEEE80211_PROBE_INTERVAL (60 * HZ)
45 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
46 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
47 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
48 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
49
50 #define IEEE80211_PROBE_DELAY (HZ / 33)
51 #define IEEE80211_CHANNEL_TIME (HZ / 33)
52 #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 5)
53 #define IEEE80211_SCAN_RESULT_EXPIRE (10 * HZ)
54 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
55 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
56 #define IEEE80211_MESH_PEER_INACTIVITY_LIMIT (1800 * HZ)
57
58 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
59
60
61 #define ERP_INFO_USE_PROTECTION BIT(1)
62
63 /* mgmt header + 1 byte action code */
64 #define IEEE80211_MIN_ACTION_SIZE (24 + 1)
65
66 #define IEEE80211_ADDBA_PARAM_POLICY_MASK 0x0002
67 #define IEEE80211_ADDBA_PARAM_TID_MASK 0x003C
68 #define IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK 0xFFA0
69 #define IEEE80211_DELBA_PARAM_TID_MASK 0xF000
70 #define IEEE80211_DELBA_PARAM_INITIATOR_MASK 0x0800
71
72 /* next values represent the buffer size for A-MPDU frame.
73  * According to IEEE802.11n spec size varies from 8K to 64K (in powers of 2) */
74 #define IEEE80211_MIN_AMPDU_BUF 0x8
75 #define IEEE80211_MAX_AMPDU_BUF 0x40
76
77 static void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
78                                      u8 *ssid, size_t ssid_len);
79 static struct ieee80211_sta_bss *
80 ieee80211_rx_bss_get(struct ieee80211_local *local, u8 *bssid, int freq,
81                      u8 *ssid, u8 ssid_len);
82 static void ieee80211_rx_bss_put(struct ieee80211_local *local,
83                                  struct ieee80211_sta_bss *bss);
84 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
85                                    struct ieee80211_if_sta *ifsta);
86 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata);
87 static int ieee80211_sta_start_scan(struct ieee80211_sub_if_data *sdata,
88                                     u8 *ssid, size_t ssid_len);
89 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
90                                      struct ieee80211_if_sta *ifsta);
91 static void sta_rx_agg_session_timer_expired(unsigned long data);
92
93
94 void ieee802_11_parse_elems(u8 *start, size_t len,
95                             struct ieee802_11_elems *elems)
96 {
97         size_t left = len;
98         u8 *pos = start;
99
100         memset(elems, 0, sizeof(*elems));
101         elems->ie_start = start;
102         elems->total_len = len;
103
104         while (left >= 2) {
105                 u8 id, elen;
106
107                 id = *pos++;
108                 elen = *pos++;
109                 left -= 2;
110
111                 if (elen > left)
112                         return;
113
114                 switch (id) {
115                 case WLAN_EID_SSID:
116                         elems->ssid = pos;
117                         elems->ssid_len = elen;
118                         break;
119                 case WLAN_EID_SUPP_RATES:
120                         elems->supp_rates = pos;
121                         elems->supp_rates_len = elen;
122                         break;
123                 case WLAN_EID_FH_PARAMS:
124                         elems->fh_params = pos;
125                         elems->fh_params_len = elen;
126                         break;
127                 case WLAN_EID_DS_PARAMS:
128                         elems->ds_params = pos;
129                         elems->ds_params_len = elen;
130                         break;
131                 case WLAN_EID_CF_PARAMS:
132                         elems->cf_params = pos;
133                         elems->cf_params_len = elen;
134                         break;
135                 case WLAN_EID_TIM:
136                         elems->tim = pos;
137                         elems->tim_len = elen;
138                         break;
139                 case WLAN_EID_IBSS_PARAMS:
140                         elems->ibss_params = pos;
141                         elems->ibss_params_len = elen;
142                         break;
143                 case WLAN_EID_CHALLENGE:
144                         elems->challenge = pos;
145                         elems->challenge_len = elen;
146                         break;
147                 case WLAN_EID_WPA:
148                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
149                             pos[2] == 0xf2) {
150                                 /* Microsoft OUI (00:50:F2) */
151                                 if (pos[3] == 1) {
152                                         /* OUI Type 1 - WPA IE */
153                                         elems->wpa = pos;
154                                         elems->wpa_len = elen;
155                                 } else if (elen >= 5 && pos[3] == 2) {
156                                         if (pos[4] == 0) {
157                                                 elems->wmm_info = pos;
158                                                 elems->wmm_info_len = elen;
159                                         } else if (pos[4] == 1) {
160                                                 elems->wmm_param = pos;
161                                                 elems->wmm_param_len = elen;
162                                         }
163                                 }
164                         }
165                         break;
166                 case WLAN_EID_RSN:
167                         elems->rsn = pos;
168                         elems->rsn_len = elen;
169                         break;
170                 case WLAN_EID_ERP_INFO:
171                         elems->erp_info = pos;
172                         elems->erp_info_len = elen;
173                         break;
174                 case WLAN_EID_EXT_SUPP_RATES:
175                         elems->ext_supp_rates = pos;
176                         elems->ext_supp_rates_len = elen;
177                         break;
178                 case WLAN_EID_HT_CAPABILITY:
179                         elems->ht_cap_elem = pos;
180                         elems->ht_cap_elem_len = elen;
181                         break;
182                 case WLAN_EID_HT_EXTRA_INFO:
183                         elems->ht_info_elem = pos;
184                         elems->ht_info_elem_len = elen;
185                         break;
186                 case WLAN_EID_MESH_ID:
187                         elems->mesh_id = pos;
188                         elems->mesh_id_len = elen;
189                         break;
190                 case WLAN_EID_MESH_CONFIG:
191                         elems->mesh_config = pos;
192                         elems->mesh_config_len = elen;
193                         break;
194                 case WLAN_EID_PEER_LINK:
195                         elems->peer_link = pos;
196                         elems->peer_link_len = elen;
197                         break;
198                 case WLAN_EID_PREQ:
199                         elems->preq = pos;
200                         elems->preq_len = elen;
201                         break;
202                 case WLAN_EID_PREP:
203                         elems->prep = pos;
204                         elems->prep_len = elen;
205                         break;
206                 case WLAN_EID_PERR:
207                         elems->perr = pos;
208                         elems->perr_len = elen;
209                         break;
210                 case WLAN_EID_CHANNEL_SWITCH:
211                         elems->ch_switch_elem = pos;
212                         elems->ch_switch_elem_len = elen;
213                         break;
214                 case WLAN_EID_QUIET:
215                         if (!elems->quiet_elem) {
216                                 elems->quiet_elem = pos;
217                                 elems->quiet_elem_len = elen;
218                         }
219                         elems->num_of_quiet_elem++;
220                         break;
221                 case WLAN_EID_COUNTRY:
222                         elems->country_elem = pos;
223                         elems->country_elem_len = elen;
224                         break;
225                 case WLAN_EID_PWR_CONSTRAINT:
226                         elems->pwr_constr_elem = pos;
227                         elems->pwr_constr_elem_len = elen;
228                         break;
229                 default:
230                         break;
231                 }
232
233                 left -= elen;
234                 pos += elen;
235         }
236 }
237
238
239 static u8 * ieee80211_bss_get_ie(struct ieee80211_sta_bss *bss, u8 ie)
240 {
241         u8 *end, *pos;
242
243         pos = bss->ies;
244         if (pos == NULL)
245                 return NULL;
246         end = pos + bss->ies_len;
247
248         while (pos + 1 < end) {
249                 if (pos + 2 + pos[1] > end)
250                         break;
251                 if (pos[0] == ie)
252                         return pos;
253                 pos += 2 + pos[1];
254         }
255
256         return NULL;
257 }
258
259
260 static int ecw2cw(int ecw)
261 {
262         return (1 << ecw) - 1;
263 }
264
265
266 static void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
267                                          struct ieee80211_sta_bss *bss,
268                                          int ibss)
269 {
270         struct ieee80211_local *local = sdata->local;
271         int i, have_higher_than_11mbit = 0;
272
273
274         /* cf. IEEE 802.11 9.2.12 */
275         for (i = 0; i < bss->supp_rates_len; i++)
276                 if ((bss->supp_rates[i] & 0x7f) * 5 > 110)
277                         have_higher_than_11mbit = 1;
278
279         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
280             have_higher_than_11mbit)
281                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
282         else
283                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
284
285
286         if (local->ops->conf_tx) {
287                 struct ieee80211_tx_queue_params qparam;
288
289                 memset(&qparam, 0, sizeof(qparam));
290
291                 qparam.aifs = 2;
292
293                 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
294                     !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE))
295                         qparam.cw_min = 31;
296                 else
297                         qparam.cw_min = 15;
298
299                 qparam.cw_max = 1023;
300                 qparam.txop = 0;
301
302                 for (i = 0; i < local_to_hw(local)->queues; i++)
303                         local->ops->conf_tx(local_to_hw(local), i, &qparam);
304         }
305 }
306
307 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
308                                      struct ieee80211_if_sta *ifsta,
309                                      u8 *wmm_param, size_t wmm_param_len)
310 {
311         struct ieee80211_tx_queue_params params;
312         size_t left;
313         int count;
314         u8 *pos;
315
316         if (!(ifsta->flags & IEEE80211_STA_WMM_ENABLED))
317                 return;
318
319         if (!wmm_param)
320                 return;
321
322         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
323                 return;
324         count = wmm_param[6] & 0x0f;
325         if (count == ifsta->wmm_last_param_set)
326                 return;
327         ifsta->wmm_last_param_set = count;
328
329         pos = wmm_param + 8;
330         left = wmm_param_len - 8;
331
332         memset(&params, 0, sizeof(params));
333
334         if (!local->ops->conf_tx)
335                 return;
336
337         local->wmm_acm = 0;
338         for (; left >= 4; left -= 4, pos += 4) {
339                 int aci = (pos[0] >> 5) & 0x03;
340                 int acm = (pos[0] >> 4) & 0x01;
341                 int queue;
342
343                 switch (aci) {
344                 case 1:
345                         queue = 3;
346                         if (acm)
347                                 local->wmm_acm |= BIT(0) | BIT(3);
348                         break;
349                 case 2:
350                         queue = 1;
351                         if (acm)
352                                 local->wmm_acm |= BIT(4) | BIT(5);
353                         break;
354                 case 3:
355                         queue = 0;
356                         if (acm)
357                                 local->wmm_acm |= BIT(6) | BIT(7);
358                         break;
359                 case 0:
360                 default:
361                         queue = 2;
362                         if (acm)
363                                 local->wmm_acm |= BIT(1) | BIT(2);
364                         break;
365                 }
366
367                 params.aifs = pos[0] & 0x0f;
368                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
369                 params.cw_min = ecw2cw(pos[1] & 0x0f);
370                 params.txop = get_unaligned_le16(pos + 2);
371 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
372                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
373                        "cWmin=%d cWmax=%d txop=%d\n",
374                        local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
375                        params.cw_max, params.txop);
376 #endif
377                 /* TODO: handle ACM (block TX, fallback to next lowest allowed
378                  * AC for now) */
379                 if (local->ops->conf_tx(local_to_hw(local), queue, &params)) {
380                         printk(KERN_DEBUG "%s: failed to set TX queue "
381                                "parameters for queue %d\n", local->mdev->name, queue);
382                 }
383         }
384 }
385
386 static u32 ieee80211_handle_protect_preamb(struct ieee80211_sub_if_data *sdata,
387                                            bool use_protection,
388                                            bool use_short_preamble)
389 {
390         struct ieee80211_bss_conf *bss_conf = &sdata->bss_conf;
391 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
392         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
393         DECLARE_MAC_BUF(mac);
394 #endif
395         u32 changed = 0;
396
397         if (use_protection != bss_conf->use_cts_prot) {
398 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
399                 if (net_ratelimit()) {
400                         printk(KERN_DEBUG "%s: CTS protection %s (BSSID="
401                                "%s)\n",
402                                sdata->dev->name,
403                                use_protection ? "enabled" : "disabled",
404                                print_mac(mac, ifsta->bssid));
405                 }
406 #endif
407                 bss_conf->use_cts_prot = use_protection;
408                 changed |= BSS_CHANGED_ERP_CTS_PROT;
409         }
410
411         if (use_short_preamble != bss_conf->use_short_preamble) {
412 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
413                 if (net_ratelimit()) {
414                         printk(KERN_DEBUG "%s: switched to %s barker preamble"
415                                " (BSSID=%s)\n",
416                                sdata->dev->name,
417                                use_short_preamble ? "short" : "long",
418                                print_mac(mac, ifsta->bssid));
419                 }
420 #endif
421                 bss_conf->use_short_preamble = use_short_preamble;
422                 changed |= BSS_CHANGED_ERP_PREAMBLE;
423         }
424
425         return changed;
426 }
427
428 static u32 ieee80211_handle_erp_ie(struct ieee80211_sub_if_data *sdata,
429                                    u8 erp_value)
430 {
431         bool use_protection = (erp_value & WLAN_ERP_USE_PROTECTION) != 0;
432         bool use_short_preamble = (erp_value & WLAN_ERP_BARKER_PREAMBLE) == 0;
433
434         return ieee80211_handle_protect_preamb(sdata,
435                         use_protection, use_short_preamble);
436 }
437
438 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
439                                            struct ieee80211_sta_bss *bss)
440 {
441         u32 changed = 0;
442
443         if (bss->has_erp_value)
444                 changed |= ieee80211_handle_erp_ie(sdata, bss->erp_value);
445         else {
446                 u16 capab = bss->capability;
447                 changed |= ieee80211_handle_protect_preamb(sdata, false,
448                                 (capab & WLAN_CAPABILITY_SHORT_PREAMBLE) != 0);
449         }
450
451         return changed;
452 }
453
454 int ieee80211_ht_cap_ie_to_ht_info(struct ieee80211_ht_cap *ht_cap_ie,
455                                    struct ieee80211_ht_info *ht_info)
456 {
457
458         if (ht_info == NULL)
459                 return -EINVAL;
460
461         memset(ht_info, 0, sizeof(*ht_info));
462
463         if (ht_cap_ie) {
464                 u8 ampdu_info = ht_cap_ie->ampdu_params_info;
465
466                 ht_info->ht_supported = 1;
467                 ht_info->cap = le16_to_cpu(ht_cap_ie->cap_info);
468                 ht_info->ampdu_factor =
469                         ampdu_info & IEEE80211_HT_CAP_AMPDU_FACTOR;
470                 ht_info->ampdu_density =
471                         (ampdu_info & IEEE80211_HT_CAP_AMPDU_DENSITY) >> 2;
472                 memcpy(ht_info->supp_mcs_set, ht_cap_ie->supp_mcs_set, 16);
473         } else
474                 ht_info->ht_supported = 0;
475
476         return 0;
477 }
478
479 int ieee80211_ht_addt_info_ie_to_ht_bss_info(
480                         struct ieee80211_ht_addt_info *ht_add_info_ie,
481                         struct ieee80211_ht_bss_info *bss_info)
482 {
483         if (bss_info == NULL)
484                 return -EINVAL;
485
486         memset(bss_info, 0, sizeof(*bss_info));
487
488         if (ht_add_info_ie) {
489                 u16 op_mode;
490                 op_mode = le16_to_cpu(ht_add_info_ie->operation_mode);
491
492                 bss_info->primary_channel = ht_add_info_ie->control_chan;
493                 bss_info->bss_cap = ht_add_info_ie->ht_param;
494                 bss_info->bss_op_mode = (u8)(op_mode & 0xff);
495         }
496
497         return 0;
498 }
499
500 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata,
501                                          struct ieee80211_if_sta *ifsta)
502 {
503         union iwreq_data wrqu;
504
505         if (ifsta->assocreq_ies) {
506                 memset(&wrqu, 0, sizeof(wrqu));
507                 wrqu.data.length = ifsta->assocreq_ies_len;
508                 wireless_send_event(sdata->dev, IWEVASSOCREQIE, &wrqu,
509                                     ifsta->assocreq_ies);
510         }
511         if (ifsta->assocresp_ies) {
512                 memset(&wrqu, 0, sizeof(wrqu));
513                 wrqu.data.length = ifsta->assocresp_ies_len;
514                 wireless_send_event(sdata->dev, IWEVASSOCRESPIE, &wrqu,
515                                     ifsta->assocresp_ies);
516         }
517 }
518
519
520 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
521                                      struct ieee80211_if_sta *ifsta,
522                                      bool assoc)
523 {
524         struct ieee80211_local *local = sdata->local;
525         struct ieee80211_conf *conf = &local_to_hw(local)->conf;
526         union iwreq_data wrqu;
527         u32 changed = BSS_CHANGED_ASSOC;
528
529         if (assoc) {
530                 struct ieee80211_sta_bss *bss;
531
532                 ifsta->flags |= IEEE80211_STA_ASSOCIATED;
533
534                 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
535                         return;
536
537                 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
538                                            conf->channel->center_freq,
539                                            ifsta->ssid, ifsta->ssid_len);
540                 if (bss) {
541                         /* set timing information */
542                         sdata->bss_conf.beacon_int = bss->beacon_int;
543                         sdata->bss_conf.timestamp = bss->timestamp;
544                         sdata->bss_conf.dtim_period = bss->dtim_period;
545
546                         changed |= ieee80211_handle_bss_capability(sdata, bss);
547
548                         ieee80211_rx_bss_put(local, bss);
549                 }
550
551                 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) {
552                         changed |= BSS_CHANGED_HT;
553                         sdata->bss_conf.assoc_ht = 1;
554                         sdata->bss_conf.ht_conf = &conf->ht_conf;
555                         sdata->bss_conf.ht_bss_conf = &conf->ht_bss_conf;
556                 }
557
558                 ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
559                 memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
560                 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
561                 ieee80211_sta_send_associnfo(sdata, ifsta);
562         } else {
563                 netif_carrier_off(sdata->dev);
564                 ieee80211_sta_tear_down_BA_sessions(sdata, ifsta->bssid);
565                 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
566                 changed |= ieee80211_reset_erp_info(sdata);
567
568                 sdata->bss_conf.assoc_ht = 0;
569                 sdata->bss_conf.ht_conf = NULL;
570                 sdata->bss_conf.ht_bss_conf = NULL;
571
572                 memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
573         }
574         ifsta->last_probe = jiffies;
575         ieee80211_led_assoc(local, assoc);
576
577         sdata->bss_conf.assoc = assoc;
578         ieee80211_bss_info_change_notify(sdata, changed);
579
580         if (assoc)
581                 netif_carrier_on(sdata->dev);
582
583         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
584         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
585 }
586
587 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
588                                    struct ieee80211_if_sta *ifsta, int deauth)
589 {
590         if (deauth) {
591                 ifsta->direct_probe_tries = 0;
592                 ifsta->auth_tries = 0;
593         }
594         ifsta->assoc_scan_tries = 0;
595         ifsta->assoc_tries = 0;
596         ieee80211_set_associated(sdata, ifsta, 0);
597 }
598
599 void ieee80211_sta_tx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
600                       int encrypt)
601 {
602         skb->dev = sdata->local->mdev;
603         skb_set_mac_header(skb, 0);
604         skb_set_network_header(skb, 0);
605         skb_set_transport_header(skb, 0);
606
607         skb->iif = sdata->dev->ifindex;
608         skb->do_not_encrypt = !encrypt;
609
610         dev_queue_xmit(skb);
611 }
612
613
614 static void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
615                                 struct ieee80211_if_sta *ifsta,
616                                 int transaction, u8 *extra, size_t extra_len,
617                                 int encrypt)
618 {
619         struct ieee80211_local *local = sdata->local;
620         struct sk_buff *skb;
621         struct ieee80211_mgmt *mgmt;
622
623         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
624                             sizeof(*mgmt) + 6 + extra_len);
625         if (!skb) {
626                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
627                        "frame\n", sdata->dev->name);
628                 return;
629         }
630         skb_reserve(skb, local->hw.extra_tx_headroom);
631
632         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
633         memset(mgmt, 0, 24 + 6);
634         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
635                                           IEEE80211_STYPE_AUTH);
636         if (encrypt)
637                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
638         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
639         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
640         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
641         mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg);
642         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
643         ifsta->auth_transaction = transaction + 1;
644         mgmt->u.auth.status_code = cpu_to_le16(0);
645         if (extra)
646                 memcpy(skb_put(skb, extra_len), extra, extra_len);
647
648         ieee80211_sta_tx(sdata, skb, encrypt);
649 }
650
651 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
652                                    struct ieee80211_if_sta *ifsta)
653 {
654         DECLARE_MAC_BUF(mac);
655
656         ifsta->direct_probe_tries++;
657         if (ifsta->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
658                 printk(KERN_DEBUG "%s: direct probe to AP %s timed out\n",
659                        sdata->dev->name, print_mac(mac, ifsta->bssid));
660                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
661                 return;
662         }
663
664         printk(KERN_DEBUG "%s: direct probe to AP %s try %d\n",
665                         sdata->dev->name, print_mac(mac, ifsta->bssid),
666                         ifsta->direct_probe_tries);
667
668         ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
669
670         set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifsta->request);
671
672         /* Direct probe is sent to broadcast address as some APs
673          * will not answer to direct packet in unassociated state.
674          */
675         ieee80211_send_probe_req(sdata, NULL,
676                                  ifsta->ssid, ifsta->ssid_len);
677
678         mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
679 }
680
681
682 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
683                                    struct ieee80211_if_sta *ifsta)
684 {
685         DECLARE_MAC_BUF(mac);
686
687         ifsta->auth_tries++;
688         if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
689                 printk(KERN_DEBUG "%s: authentication with AP %s"
690                        " timed out\n",
691                        sdata->dev->name, print_mac(mac, ifsta->bssid));
692                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
693                 return;
694         }
695
696         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
697         printk(KERN_DEBUG "%s: authenticate with AP %s\n",
698                sdata->dev->name, print_mac(mac, ifsta->bssid));
699
700         ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0);
701
702         mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
703 }
704
705 static int ieee80211_compatible_rates(struct ieee80211_sta_bss *bss,
706                                       struct ieee80211_supported_band *sband,
707                                       u64 *rates)
708 {
709         int i, j, count;
710         *rates = 0;
711         count = 0;
712         for (i = 0; i < bss->supp_rates_len; i++) {
713                 int rate = (bss->supp_rates[i] & 0x7F) * 5;
714
715                 for (j = 0; j < sband->n_bitrates; j++)
716                         if (sband->bitrates[j].bitrate == rate) {
717                                 *rates |= BIT(j);
718                                 count++;
719                                 break;
720                         }
721         }
722
723         return count;
724 }
725
726 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
727                                  struct ieee80211_if_sta *ifsta)
728 {
729         struct ieee80211_local *local = sdata->local;
730         struct sk_buff *skb;
731         struct ieee80211_mgmt *mgmt;
732         u8 *pos, *ies, *ht_add_ie;
733         int i, len, count, rates_len, supp_rates_len;
734         u16 capab;
735         struct ieee80211_sta_bss *bss;
736         int wmm = 0;
737         struct ieee80211_supported_band *sband;
738         u64 rates = 0;
739
740         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
741                             sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
742                             ifsta->ssid_len);
743         if (!skb) {
744                 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
745                        "frame\n", sdata->dev->name);
746                 return;
747         }
748         skb_reserve(skb, local->hw.extra_tx_headroom);
749
750         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
751
752         capab = ifsta->capab;
753
754         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
755                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
756                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
757                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
758                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
759         }
760
761         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
762                                    local->hw.conf.channel->center_freq,
763                                    ifsta->ssid, ifsta->ssid_len);
764         if (bss) {
765                 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
766                         capab |= WLAN_CAPABILITY_PRIVACY;
767                 if (bss->wmm_used)
768                         wmm = 1;
769
770                 /* get all rates supported by the device and the AP as
771                  * some APs don't like getting a superset of their rates
772                  * in the association request (e.g. D-Link DAP 1353 in
773                  * b-only mode) */
774                 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
775
776                 if ((bss->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
777                     (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
778                         capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
779
780                 ieee80211_rx_bss_put(local, bss);
781         } else {
782                 rates = ~0;
783                 rates_len = sband->n_bitrates;
784         }
785
786         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
787         memset(mgmt, 0, 24);
788         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
789         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
790         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
791
792         if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
793                 skb_put(skb, 10);
794                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
795                                                   IEEE80211_STYPE_REASSOC_REQ);
796                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
797                 mgmt->u.reassoc_req.listen_interval =
798                                 cpu_to_le16(local->hw.conf.listen_interval);
799                 memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
800                        ETH_ALEN);
801         } else {
802                 skb_put(skb, 4);
803                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
804                                                   IEEE80211_STYPE_ASSOC_REQ);
805                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
806                 mgmt->u.reassoc_req.listen_interval =
807                                 cpu_to_le16(local->hw.conf.listen_interval);
808         }
809
810         /* SSID */
811         ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
812         *pos++ = WLAN_EID_SSID;
813         *pos++ = ifsta->ssid_len;
814         memcpy(pos, ifsta->ssid, ifsta->ssid_len);
815
816         /* add all rates which were marked to be used above */
817         supp_rates_len = rates_len;
818         if (supp_rates_len > 8)
819                 supp_rates_len = 8;
820
821         len = sband->n_bitrates;
822         pos = skb_put(skb, supp_rates_len + 2);
823         *pos++ = WLAN_EID_SUPP_RATES;
824         *pos++ = supp_rates_len;
825
826         count = 0;
827         for (i = 0; i < sband->n_bitrates; i++) {
828                 if (BIT(i) & rates) {
829                         int rate = sband->bitrates[i].bitrate;
830                         *pos++ = (u8) (rate / 5);
831                         if (++count == 8)
832                                 break;
833                 }
834         }
835
836         if (rates_len > count) {
837                 pos = skb_put(skb, rates_len - count + 2);
838                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
839                 *pos++ = rates_len - count;
840
841                 for (i++; i < sband->n_bitrates; i++) {
842                         if (BIT(i) & rates) {
843                                 int rate = sband->bitrates[i].bitrate;
844                                 *pos++ = (u8) (rate / 5);
845                         }
846                 }
847         }
848
849         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
850                 /* 1. power capabilities */
851                 pos = skb_put(skb, 4);
852                 *pos++ = WLAN_EID_PWR_CAPABILITY;
853                 *pos++ = 2;
854                 *pos++ = 0; /* min tx power */
855                 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
856
857                 /* 2. supported channels */
858                 /* TODO: get this in reg domain format */
859                 pos = skb_put(skb, 2 * sband->n_channels + 2);
860                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
861                 *pos++ = 2 * sband->n_channels;
862                 for (i = 0; i < sband->n_channels; i++) {
863                         *pos++ = ieee80211_frequency_to_channel(
864                                         sband->channels[i].center_freq);
865                         *pos++ = 1; /* one channel in the subband*/
866                 }
867         }
868
869         if (ifsta->extra_ie) {
870                 pos = skb_put(skb, ifsta->extra_ie_len);
871                 memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
872         }
873
874         if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
875                 pos = skb_put(skb, 9);
876                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
877                 *pos++ = 7; /* len */
878                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
879                 *pos++ = 0x50;
880                 *pos++ = 0xf2;
881                 *pos++ = 2; /* WME */
882                 *pos++ = 0; /* WME info */
883                 *pos++ = 1; /* WME ver */
884                 *pos++ = 0;
885         }
886
887         /* wmm support is a must to HT */
888         if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
889             sband->ht_info.ht_supported &&
890             (ht_add_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_EXTRA_INFO))) {
891                 struct ieee80211_ht_addt_info *ht_add_info =
892                         (struct ieee80211_ht_addt_info *)ht_add_ie;
893                 u16 cap = sband->ht_info.cap;
894                 __le16 tmp;
895                 u32 flags = local->hw.conf.channel->flags;
896
897                 switch (ht_add_info->ht_param & IEEE80211_HT_IE_CHA_SEC_OFFSET) {
898                 case IEEE80211_HT_IE_CHA_SEC_ABOVE:
899                         if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
900                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH;
901                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
902                         }
903                         break;
904                 case IEEE80211_HT_IE_CHA_SEC_BELOW:
905                         if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
906                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH;
907                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
908                         }
909                         break;
910                 }
911
912                 tmp = cpu_to_le16(cap);
913                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
914                 *pos++ = WLAN_EID_HT_CAPABILITY;
915                 *pos++ = sizeof(struct ieee80211_ht_cap);
916                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
917                 memcpy(pos, &tmp, sizeof(u16));
918                 pos += sizeof(u16);
919                 /* TODO: needs a define here for << 2 */
920                 *pos++ = sband->ht_info.ampdu_factor |
921                          (sband->ht_info.ampdu_density << 2);
922                 memcpy(pos, sband->ht_info.supp_mcs_set, 16);
923         }
924
925         kfree(ifsta->assocreq_ies);
926         ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
927         ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
928         if (ifsta->assocreq_ies)
929                 memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);
930
931         ieee80211_sta_tx(sdata, skb, 0);
932 }
933
934
935 static void ieee80211_send_deauth(struct ieee80211_sub_if_data *sdata,
936                                   struct ieee80211_if_sta *ifsta, u16 reason)
937 {
938         struct ieee80211_local *local = sdata->local;
939         struct sk_buff *skb;
940         struct ieee80211_mgmt *mgmt;
941
942         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
943         if (!skb) {
944                 printk(KERN_DEBUG "%s: failed to allocate buffer for deauth "
945                        "frame\n", sdata->dev->name);
946                 return;
947         }
948         skb_reserve(skb, local->hw.extra_tx_headroom);
949
950         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
951         memset(mgmt, 0, 24);
952         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
953         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
954         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
955         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
956                                           IEEE80211_STYPE_DEAUTH);
957         skb_put(skb, 2);
958         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
959
960         ieee80211_sta_tx(sdata, skb, 0);
961 }
962
963
964 static void ieee80211_send_disassoc(struct ieee80211_sub_if_data *sdata,
965                                     struct ieee80211_if_sta *ifsta, u16 reason)
966 {
967         struct ieee80211_local *local = sdata->local;
968         struct sk_buff *skb;
969         struct ieee80211_mgmt *mgmt;
970
971         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
972         if (!skb) {
973                 printk(KERN_DEBUG "%s: failed to allocate buffer for disassoc "
974                        "frame\n", sdata->dev->name);
975                 return;
976         }
977         skb_reserve(skb, local->hw.extra_tx_headroom);
978
979         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
980         memset(mgmt, 0, 24);
981         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
982         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
983         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
984         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
985                                           IEEE80211_STYPE_DISASSOC);
986         skb_put(skb, 2);
987         mgmt->u.disassoc.reason_code = cpu_to_le16(reason);
988
989         ieee80211_sta_tx(sdata, skb, 0);
990 }
991
992
993 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
994                                       struct ieee80211_if_sta *ifsta)
995 {
996         struct ieee80211_local *local = sdata->local;
997         struct ieee80211_sta_bss *bss;
998         int bss_privacy;
999         int wep_privacy;
1000         int privacy_invoked;
1001
1002         if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
1003                 return 0;
1004
1005         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
1006                                    local->hw.conf.channel->center_freq,
1007                                    ifsta->ssid, ifsta->ssid_len);
1008         if (!bss)
1009                 return 0;
1010
1011         bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
1012         wep_privacy = !!ieee80211_sta_wep_configured(sdata);
1013         privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
1014
1015         ieee80211_rx_bss_put(local, bss);
1016
1017         if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
1018                 return 0;
1019
1020         return 1;
1021 }
1022
1023
1024 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
1025                                 struct ieee80211_if_sta *ifsta)
1026 {
1027         DECLARE_MAC_BUF(mac);
1028
1029         ifsta->assoc_tries++;
1030         if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
1031                 printk(KERN_DEBUG "%s: association with AP %s"
1032                        " timed out\n",
1033                        sdata->dev->name, print_mac(mac, ifsta->bssid));
1034                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
1035                 return;
1036         }
1037
1038         ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1039         printk(KERN_DEBUG "%s: associate with AP %s\n",
1040                sdata->dev->name, print_mac(mac, ifsta->bssid));
1041         if (ieee80211_privacy_mismatch(sdata, ifsta)) {
1042                 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
1043                        "mixed-cell disabled - abort association\n", sdata->dev->name);
1044                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
1045                 return;
1046         }
1047
1048         ieee80211_send_assoc(sdata, ifsta);
1049
1050         mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
1051 }
1052
1053
1054 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
1055                                  struct ieee80211_if_sta *ifsta)
1056 {
1057         struct ieee80211_local *local = sdata->local;
1058         struct sta_info *sta;
1059         int disassoc;
1060         DECLARE_MAC_BUF(mac);
1061
1062         /* TODO: start monitoring current AP signal quality and number of
1063          * missed beacons. Scan other channels every now and then and search
1064          * for better APs. */
1065         /* TODO: remove expired BSSes */
1066
1067         ifsta->state = IEEE80211_STA_MLME_ASSOCIATED;
1068
1069         rcu_read_lock();
1070
1071         sta = sta_info_get(local, ifsta->bssid);
1072         if (!sta) {
1073                 printk(KERN_DEBUG "%s: No STA entry for own AP %s\n",
1074                        sdata->dev->name, print_mac(mac, ifsta->bssid));
1075                 disassoc = 1;
1076         } else {
1077                 disassoc = 0;
1078                 if (time_after(jiffies,
1079                                sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
1080                         if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
1081                                 printk(KERN_DEBUG "%s: No ProbeResp from "
1082                                        "current AP %s - assume out of "
1083                                        "range\n",
1084                                        sdata->dev->name, print_mac(mac, ifsta->bssid));
1085                                 disassoc = 1;
1086                                 sta_info_unlink(&sta);
1087                         } else
1088                                 ieee80211_send_probe_req(sdata, ifsta->bssid,
1089                                                          local->scan_ssid,
1090                                                          local->scan_ssid_len);
1091                         ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
1092                 } else {
1093                         ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1094                         if (time_after(jiffies, ifsta->last_probe +
1095                                        IEEE80211_PROBE_INTERVAL)) {
1096                                 ifsta->last_probe = jiffies;
1097                                 ieee80211_send_probe_req(sdata, ifsta->bssid,
1098                                                          ifsta->ssid,
1099                                                          ifsta->ssid_len);
1100                         }
1101                 }
1102         }
1103
1104         rcu_read_unlock();
1105
1106         if (disassoc && sta)
1107                 sta_info_destroy(sta);
1108
1109         if (disassoc) {
1110                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
1111                 ieee80211_set_associated(sdata, ifsta, 0);
1112         } else {
1113                 mod_timer(&ifsta->timer, jiffies +
1114                                       IEEE80211_MONITORING_INTERVAL);
1115         }
1116 }
1117
1118
1119 static void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1120                                      u8 *ssid, size_t ssid_len)
1121 {
1122         struct ieee80211_local *local = sdata->local;
1123         struct ieee80211_supported_band *sband;
1124         struct sk_buff *skb;
1125         struct ieee80211_mgmt *mgmt;
1126         u8 *pos, *supp_rates, *esupp_rates = NULL;
1127         int i;
1128
1129         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200);
1130         if (!skb) {
1131                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
1132                        "request\n", sdata->dev->name);
1133                 return;
1134         }
1135         skb_reserve(skb, local->hw.extra_tx_headroom);
1136
1137         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1138         memset(mgmt, 0, 24);
1139         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1140                                           IEEE80211_STYPE_PROBE_REQ);
1141         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1142         if (dst) {
1143                 memcpy(mgmt->da, dst, ETH_ALEN);
1144                 memcpy(mgmt->bssid, dst, ETH_ALEN);
1145         } else {
1146                 memset(mgmt->da, 0xff, ETH_ALEN);
1147                 memset(mgmt->bssid, 0xff, ETH_ALEN);
1148         }
1149         pos = skb_put(skb, 2 + ssid_len);
1150         *pos++ = WLAN_EID_SSID;
1151         *pos++ = ssid_len;
1152         memcpy(pos, ssid, ssid_len);
1153
1154         supp_rates = skb_put(skb, 2);
1155         supp_rates[0] = WLAN_EID_SUPP_RATES;
1156         supp_rates[1] = 0;
1157         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1158
1159         for (i = 0; i < sband->n_bitrates; i++) {
1160                 struct ieee80211_rate *rate = &sband->bitrates[i];
1161                 if (esupp_rates) {
1162                         pos = skb_put(skb, 1);
1163                         esupp_rates[1]++;
1164                 } else if (supp_rates[1] == 8) {
1165                         esupp_rates = skb_put(skb, 3);
1166                         esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
1167                         esupp_rates[1] = 1;
1168                         pos = &esupp_rates[2];
1169                 } else {
1170                         pos = skb_put(skb, 1);
1171                         supp_rates[1]++;
1172                 }
1173                 *pos = rate->bitrate / 5;
1174         }
1175
1176         ieee80211_sta_tx(sdata, skb, 0);
1177 }
1178
1179
1180 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
1181 {
1182         if (!sdata || !sdata->default_key ||
1183             sdata->default_key->conf.alg != ALG_WEP)
1184                 return 0;
1185         return 1;
1186 }
1187
1188
1189 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1190                                      struct ieee80211_if_sta *ifsta)
1191 {
1192         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1193         ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
1194         ieee80211_associate(sdata, ifsta);
1195 }
1196
1197
1198 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1199                                      struct ieee80211_if_sta *ifsta,
1200                                      struct ieee80211_mgmt *mgmt,
1201                                      size_t len)
1202 {
1203         u8 *pos;
1204         struct ieee802_11_elems elems;
1205
1206         pos = mgmt->u.auth.variable;
1207         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1208         if (!elems.challenge)
1209                 return;
1210         ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2,
1211                             elems.challenge_len + 2, 1);
1212 }
1213
1214 static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data *sdata, u8 *da, u16 tid,
1215                                         u8 dialog_token, u16 status, u16 policy,
1216                                         u16 buf_size, u16 timeout)
1217 {
1218         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1219         struct ieee80211_local *local = sdata->local;
1220         struct sk_buff *skb;
1221         struct ieee80211_mgmt *mgmt;
1222         u16 capab;
1223
1224         skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
1225
1226         if (!skb) {
1227                 printk(KERN_DEBUG "%s: failed to allocate buffer "
1228                        "for addba resp frame\n", sdata->dev->name);
1229                 return;
1230         }
1231
1232         skb_reserve(skb, local->hw.extra_tx_headroom);
1233         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1234         memset(mgmt, 0, 24);
1235         memcpy(mgmt->da, da, ETH_ALEN);
1236         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1237         if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
1238                 memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
1239         else
1240                 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1241         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1242                                           IEEE80211_STYPE_ACTION);
1243
1244         skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp));
1245         mgmt->u.action.category = WLAN_CATEGORY_BACK;
1246         mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP;
1247         mgmt->u.action.u.addba_resp.dialog_token = dialog_token;
1248
1249         capab = (u16)(policy << 1);     /* bit 1 aggregation policy */
1250         capab |= (u16)(tid << 2);       /* bit 5:2 TID number */
1251         capab |= (u16)(buf_size << 6);  /* bit 15:6 max size of aggregation */
1252
1253         mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab);
1254         mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout);
1255         mgmt->u.action.u.addba_resp.status = cpu_to_le16(status);
1256
1257         ieee80211_sta_tx(sdata, skb, 0);
1258
1259         return;
1260 }
1261
1262 void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata, const u8 *da,
1263                                 u16 tid, u8 dialog_token, u16 start_seq_num,
1264                                 u16 agg_size, u16 timeout)
1265 {
1266         struct ieee80211_local *local = sdata->local;
1267         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1268         struct sk_buff *skb;
1269         struct ieee80211_mgmt *mgmt;
1270         u16 capab;
1271
1272         skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
1273
1274         if (!skb) {
1275                 printk(KERN_ERR "%s: failed to allocate buffer "
1276                                 "for addba request frame\n", sdata->dev->name);
1277                 return;
1278         }
1279         skb_reserve(skb, local->hw.extra_tx_headroom);
1280         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1281         memset(mgmt, 0, 24);
1282         memcpy(mgmt->da, da, ETH_ALEN);
1283         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1284         if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
1285                 memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
1286         else
1287                 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1288
1289         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1290                                           IEEE80211_STYPE_ACTION);
1291
1292         skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req));
1293
1294         mgmt->u.action.category = WLAN_CATEGORY_BACK;
1295         mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ;
1296
1297         mgmt->u.action.u.addba_req.dialog_token = dialog_token;
1298         capab = (u16)(1 << 1);          /* bit 1 aggregation policy */
1299         capab |= (u16)(tid << 2);       /* bit 5:2 TID number */
1300         capab |= (u16)(agg_size << 6);  /* bit 15:6 max size of aggergation */
1301
1302         mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab);
1303
1304         mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout);
1305         mgmt->u.action.u.addba_req.start_seq_num =
1306                                         cpu_to_le16(start_seq_num << 4);
1307
1308         ieee80211_sta_tx(sdata, skb, 0);
1309 }
1310
1311 static void ieee80211_sta_process_addba_request(struct ieee80211_local *local,
1312                                                 struct ieee80211_mgmt *mgmt,
1313                                                 size_t len)
1314 {
1315         struct ieee80211_hw *hw = &local->hw;
1316         struct ieee80211_conf *conf = &hw->conf;
1317         struct sta_info *sta;
1318         struct tid_ampdu_rx *tid_agg_rx;
1319         u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status;
1320         u8 dialog_token;
1321         int ret = -EOPNOTSUPP;
1322         DECLARE_MAC_BUF(mac);
1323
1324         rcu_read_lock();
1325
1326         sta = sta_info_get(local, mgmt->sa);
1327         if (!sta) {
1328                 rcu_read_unlock();
1329                 return;
1330         }
1331
1332         /* extract session parameters from addba request frame */
1333         dialog_token = mgmt->u.action.u.addba_req.dialog_token;
1334         timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout);
1335         start_seq_num =
1336                 le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4;
1337
1338         capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
1339         ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1;
1340         tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
1341         buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
1342
1343         status = WLAN_STATUS_REQUEST_DECLINED;
1344
1345         /* sanity check for incoming parameters:
1346          * check if configuration can support the BA policy
1347          * and if buffer size does not exceeds max value */
1348         if (((ba_policy != 1)
1349                 && (!(conf->ht_conf.cap & IEEE80211_HT_CAP_DELAY_BA)))
1350                 || (buf_size > IEEE80211_MAX_AMPDU_BUF)) {
1351                 status = WLAN_STATUS_INVALID_QOS_PARAM;
1352 #ifdef CONFIG_MAC80211_HT_DEBUG
1353                 if (net_ratelimit())
1354                         printk(KERN_DEBUG "AddBA Req with bad params from "
1355                                 "%s on tid %u. policy %d, buffer size %d\n",
1356                                 print_mac(mac, mgmt->sa), tid, ba_policy,
1357                                 buf_size);
1358 #endif /* CONFIG_MAC80211_HT_DEBUG */
1359                 goto end_no_lock;
1360         }
1361         /* determine default buffer size */
1362         if (buf_size == 0) {
1363                 struct ieee80211_supported_band *sband;
1364
1365                 sband = local->hw.wiphy->bands[conf->channel->band];
1366                 buf_size = IEEE80211_MIN_AMPDU_BUF;
1367                 buf_size = buf_size << sband->ht_info.ampdu_factor;
1368         }
1369
1370
1371         /* examine state machine */
1372         spin_lock_bh(&sta->lock);
1373
1374         if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_IDLE) {
1375 #ifdef CONFIG_MAC80211_HT_DEBUG
1376                 if (net_ratelimit())
1377                         printk(KERN_DEBUG "unexpected AddBA Req from "
1378                                 "%s on tid %u\n",
1379                                 print_mac(mac, mgmt->sa), tid);
1380 #endif /* CONFIG_MAC80211_HT_DEBUG */
1381                 goto end;
1382         }
1383
1384         /* prepare A-MPDU MLME for Rx aggregation */
1385         sta->ampdu_mlme.tid_rx[tid] =
1386                         kmalloc(sizeof(struct tid_ampdu_rx), GFP_ATOMIC);
1387         if (!sta->ampdu_mlme.tid_rx[tid]) {
1388 #ifdef CONFIG_MAC80211_HT_DEBUG
1389                 if (net_ratelimit())
1390                         printk(KERN_ERR "allocate rx mlme to tid %d failed\n",
1391                                         tid);
1392 #endif
1393                 goto end;
1394         }
1395         /* rx timer */
1396         sta->ampdu_mlme.tid_rx[tid]->session_timer.function =
1397                                 sta_rx_agg_session_timer_expired;
1398         sta->ampdu_mlme.tid_rx[tid]->session_timer.data =
1399                                 (unsigned long)&sta->timer_to_tid[tid];
1400         init_timer(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
1401
1402         tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
1403
1404         /* prepare reordering buffer */
1405         tid_agg_rx->reorder_buf =
1406                 kmalloc(buf_size * sizeof(struct sk_buff *), GFP_ATOMIC);
1407         if (!tid_agg_rx->reorder_buf) {
1408 #ifdef CONFIG_MAC80211_HT_DEBUG
1409                 if (net_ratelimit())
1410                         printk(KERN_ERR "can not allocate reordering buffer "
1411                                "to tid %d\n", tid);
1412 #endif
1413                 kfree(sta->ampdu_mlme.tid_rx[tid]);
1414                 goto end;
1415         }
1416         memset(tid_agg_rx->reorder_buf, 0,
1417                 buf_size * sizeof(struct sk_buff *));
1418
1419         if (local->ops->ampdu_action)
1420                 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_START,
1421                                                sta->addr, tid, &start_seq_num);
1422 #ifdef CONFIG_MAC80211_HT_DEBUG
1423         printk(KERN_DEBUG "Rx A-MPDU request on tid %d result %d\n", tid, ret);
1424 #endif /* CONFIG_MAC80211_HT_DEBUG */
1425
1426         if (ret) {
1427                 kfree(tid_agg_rx->reorder_buf);
1428                 kfree(tid_agg_rx);
1429                 sta->ampdu_mlme.tid_rx[tid] = NULL;
1430                 goto end;
1431         }
1432
1433         /* change state and send addba resp */
1434         sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_OPERATIONAL;
1435         tid_agg_rx->dialog_token = dialog_token;
1436         tid_agg_rx->ssn = start_seq_num;
1437         tid_agg_rx->head_seq_num = start_seq_num;
1438         tid_agg_rx->buf_size = buf_size;
1439         tid_agg_rx->timeout = timeout;
1440         tid_agg_rx->stored_mpdu_num = 0;
1441         status = WLAN_STATUS_SUCCESS;
1442 end:
1443         spin_unlock_bh(&sta->lock);
1444
1445 end_no_lock:
1446         ieee80211_send_addba_resp(sta->sdata, sta->addr, tid,
1447                                   dialog_token, status, 1, buf_size, timeout);
1448         rcu_read_unlock();
1449 }
1450
1451 static void ieee80211_sta_process_addba_resp(struct ieee80211_local *local,
1452                                              struct ieee80211_mgmt *mgmt,
1453                                              size_t len)
1454 {
1455         struct ieee80211_hw *hw = &local->hw;
1456         struct sta_info *sta;
1457         u16 capab;
1458         u16 tid;
1459         u8 *state;
1460
1461         rcu_read_lock();
1462
1463         sta = sta_info_get(local, mgmt->sa);
1464         if (!sta) {
1465                 rcu_read_unlock();
1466                 return;
1467         }
1468
1469         capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab);
1470         tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
1471
1472         state = &sta->ampdu_mlme.tid_state_tx[tid];
1473
1474         spin_lock_bh(&sta->lock);
1475
1476         if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
1477                 spin_unlock_bh(&sta->lock);
1478                 goto addba_resp_exit;
1479         }
1480
1481         if (mgmt->u.action.u.addba_resp.dialog_token !=
1482                 sta->ampdu_mlme.tid_tx[tid]->dialog_token) {
1483                 spin_unlock_bh(&sta->lock);
1484 #ifdef CONFIG_MAC80211_HT_DEBUG
1485                 printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid);
1486 #endif /* CONFIG_MAC80211_HT_DEBUG */
1487                 goto addba_resp_exit;
1488         }
1489
1490         del_timer_sync(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
1491 #ifdef CONFIG_MAC80211_HT_DEBUG
1492         printk(KERN_DEBUG "switched off addBA timer for tid %d \n", tid);
1493 #endif /* CONFIG_MAC80211_HT_DEBUG */
1494         if (le16_to_cpu(mgmt->u.action.u.addba_resp.status)
1495                         == WLAN_STATUS_SUCCESS) {
1496                 *state |= HT_ADDBA_RECEIVED_MSK;
1497                 sta->ampdu_mlme.addba_req_num[tid] = 0;
1498
1499                 if (*state == HT_AGG_STATE_OPERATIONAL)
1500                         ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
1501
1502                 spin_unlock_bh(&sta->lock);
1503         } else {
1504                 sta->ampdu_mlme.addba_req_num[tid]++;
1505                 /* this will allow the state check in stop_BA_session */
1506                 *state = HT_AGG_STATE_OPERATIONAL;
1507                 spin_unlock_bh(&sta->lock);
1508                 ieee80211_stop_tx_ba_session(hw, sta->addr, tid,
1509                                              WLAN_BACK_INITIATOR);
1510         }
1511
1512 addba_resp_exit:
1513         rcu_read_unlock();
1514 }
1515
1516 void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata, const u8 *da, u16 tid,
1517                           u16 initiator, u16 reason_code)
1518 {
1519         struct ieee80211_local *local = sdata->local;
1520         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1521         struct sk_buff *skb;
1522         struct ieee80211_mgmt *mgmt;
1523         u16 params;
1524
1525         skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
1526
1527         if (!skb) {
1528                 printk(KERN_ERR "%s: failed to allocate buffer "
1529                                         "for delba frame\n", sdata->dev->name);
1530                 return;
1531         }
1532
1533         skb_reserve(skb, local->hw.extra_tx_headroom);
1534         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1535         memset(mgmt, 0, 24);
1536         memcpy(mgmt->da, da, ETH_ALEN);
1537         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1538         if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
1539                 memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
1540         else
1541                 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1542         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1543                                           IEEE80211_STYPE_ACTION);
1544
1545         skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
1546
1547         mgmt->u.action.category = WLAN_CATEGORY_BACK;
1548         mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
1549         params = (u16)(initiator << 11);        /* bit 11 initiator */
1550         params |= (u16)(tid << 12);             /* bit 15:12 TID number */
1551
1552         mgmt->u.action.u.delba.params = cpu_to_le16(params);
1553         mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
1554
1555         ieee80211_sta_tx(sdata, skb, 0);
1556 }
1557
1558 void ieee80211_send_bar(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid, u16 ssn)
1559 {
1560         struct ieee80211_local *local = sdata->local;
1561         struct sk_buff *skb;
1562         struct ieee80211_bar *bar;
1563         u16 bar_control = 0;
1564
1565         skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom);
1566         if (!skb) {
1567                 printk(KERN_ERR "%s: failed to allocate buffer for "
1568                         "bar frame\n", sdata->dev->name);
1569                 return;
1570         }
1571         skb_reserve(skb, local->hw.extra_tx_headroom);
1572         bar = (struct ieee80211_bar *)skb_put(skb, sizeof(*bar));
1573         memset(bar, 0, sizeof(*bar));
1574         bar->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
1575                                          IEEE80211_STYPE_BACK_REQ);
1576         memcpy(bar->ra, ra, ETH_ALEN);
1577         memcpy(bar->ta, sdata->dev->dev_addr, ETH_ALEN);
1578         bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL;
1579         bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA;
1580         bar_control |= (u16)(tid << 12);
1581         bar->control = cpu_to_le16(bar_control);
1582         bar->start_seq_num = cpu_to_le16(ssn);
1583
1584         ieee80211_sta_tx(sdata, skb, 0);
1585 }
1586
1587 void ieee80211_sta_stop_rx_ba_session(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid,
1588                                         u16 initiator, u16 reason)
1589 {
1590         struct ieee80211_local *local = sdata->local;
1591         struct ieee80211_hw *hw = &local->hw;
1592         struct sta_info *sta;
1593         int ret, i;
1594         DECLARE_MAC_BUF(mac);
1595
1596         rcu_read_lock();
1597
1598         sta = sta_info_get(local, ra);
1599         if (!sta) {
1600                 rcu_read_unlock();
1601                 return;
1602         }
1603
1604         /* check if TID is in operational state */
1605         spin_lock_bh(&sta->lock);
1606         if (sta->ampdu_mlme.tid_state_rx[tid]
1607                                 != HT_AGG_STATE_OPERATIONAL) {
1608                 spin_unlock_bh(&sta->lock);
1609                 rcu_read_unlock();
1610                 return;
1611         }
1612         sta->ampdu_mlme.tid_state_rx[tid] =
1613                 HT_AGG_STATE_REQ_STOP_BA_MSK |
1614                 (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
1615         spin_unlock_bh(&sta->lock);
1616
1617         /* stop HW Rx aggregation. ampdu_action existence
1618          * already verified in session init so we add the BUG_ON */
1619         BUG_ON(!local->ops->ampdu_action);
1620
1621 #ifdef CONFIG_MAC80211_HT_DEBUG
1622         printk(KERN_DEBUG "Rx BA session stop requested for %s tid %u\n",
1623                                 print_mac(mac, ra), tid);
1624 #endif /* CONFIG_MAC80211_HT_DEBUG */
1625
1626         ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_STOP,
1627                                         ra, tid, NULL);
1628         if (ret)
1629                 printk(KERN_DEBUG "HW problem - can not stop rx "
1630                                 "aggregation for tid %d\n", tid);
1631
1632         /* shutdown timer has not expired */
1633         if (initiator != WLAN_BACK_TIMER)
1634                 del_timer_sync(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
1635
1636         /* check if this is a self generated aggregation halt */
1637         if (initiator == WLAN_BACK_RECIPIENT || initiator == WLAN_BACK_TIMER)
1638                 ieee80211_send_delba(sdata, ra, tid, 0, reason);
1639
1640         /* free the reordering buffer */
1641         for (i = 0; i < sta->ampdu_mlme.tid_rx[tid]->buf_size; i++) {
1642                 if (sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]) {
1643                         /* release the reordered frames */
1644                         dev_kfree_skb(sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]);
1645                         sta->ampdu_mlme.tid_rx[tid]->stored_mpdu_num--;
1646                         sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i] = NULL;
1647                 }
1648         }
1649         /* free resources */
1650         kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_buf);
1651         kfree(sta->ampdu_mlme.tid_rx[tid]);
1652         sta->ampdu_mlme.tid_rx[tid] = NULL;
1653         sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_IDLE;
1654
1655         rcu_read_unlock();
1656 }
1657
1658
1659 static void ieee80211_sta_process_delba(struct ieee80211_sub_if_data *sdata,
1660                         struct ieee80211_mgmt *mgmt, size_t len)
1661 {
1662         struct ieee80211_local *local = sdata->local;
1663         struct sta_info *sta;
1664         u16 tid, params;
1665         u16 initiator;
1666         DECLARE_MAC_BUF(mac);
1667
1668         rcu_read_lock();
1669
1670         sta = sta_info_get(local, mgmt->sa);
1671         if (!sta) {
1672                 rcu_read_unlock();
1673                 return;
1674         }
1675
1676         params = le16_to_cpu(mgmt->u.action.u.delba.params);
1677         tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
1678         initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
1679
1680 #ifdef CONFIG_MAC80211_HT_DEBUG
1681         if (net_ratelimit())
1682                 printk(KERN_DEBUG "delba from %s (%s) tid %d reason code %d\n",
1683                         print_mac(mac, mgmt->sa),
1684                         initiator ? "initiator" : "recipient", tid,
1685                         mgmt->u.action.u.delba.reason_code);
1686 #endif /* CONFIG_MAC80211_HT_DEBUG */
1687
1688         if (initiator == WLAN_BACK_INITIATOR)
1689                 ieee80211_sta_stop_rx_ba_session(sdata, sta->addr, tid,
1690                                                  WLAN_BACK_INITIATOR, 0);
1691         else { /* WLAN_BACK_RECIPIENT */
1692                 spin_lock_bh(&sta->lock);
1693                 sta->ampdu_mlme.tid_state_tx[tid] =
1694                                 HT_AGG_STATE_OPERATIONAL;
1695                 spin_unlock_bh(&sta->lock);
1696                 ieee80211_stop_tx_ba_session(&local->hw, sta->addr, tid,
1697                                              WLAN_BACK_RECIPIENT);
1698         }
1699         rcu_read_unlock();
1700 }
1701
1702 /*
1703  * After sending add Block Ack request we activated a timer until
1704  * add Block Ack response will arrive from the recipient.
1705  * If this timer expires sta_addba_resp_timer_expired will be executed.
1706  */
1707 void sta_addba_resp_timer_expired(unsigned long data)
1708 {
1709         /* not an elegant detour, but there is no choice as the timer passes
1710          * only one argument, and both sta_info and TID are needed, so init
1711          * flow in sta_info_create gives the TID as data, while the timer_to_id
1712          * array gives the sta through container_of */
1713         u16 tid = *(u8 *)data;
1714         struct sta_info *temp_sta = container_of((void *)data,
1715                 struct sta_info, timer_to_tid[tid]);
1716
1717         struct ieee80211_local *local = temp_sta->local;
1718         struct ieee80211_hw *hw = &local->hw;
1719         struct sta_info *sta;
1720         u8 *state;
1721
1722         rcu_read_lock();
1723
1724         sta = sta_info_get(local, temp_sta->addr);
1725         if (!sta) {
1726                 rcu_read_unlock();
1727                 return;
1728         }
1729
1730         state = &sta->ampdu_mlme.tid_state_tx[tid];
1731         /* check if the TID waits for addBA response */
1732         spin_lock_bh(&sta->lock);
1733         if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
1734                 spin_unlock_bh(&sta->lock);
1735                 *state = HT_AGG_STATE_IDLE;
1736 #ifdef CONFIG_MAC80211_HT_DEBUG
1737                 printk(KERN_DEBUG "timer expired on tid %d but we are not "
1738                                 "expecting addBA response there", tid);
1739 #endif
1740                 goto timer_expired_exit;
1741         }
1742
1743 #ifdef CONFIG_MAC80211_HT_DEBUG
1744         printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid);
1745 #endif
1746
1747         /* go through the state check in stop_BA_session */
1748         *state = HT_AGG_STATE_OPERATIONAL;
1749         spin_unlock_bh(&sta->lock);
1750         ieee80211_stop_tx_ba_session(hw, temp_sta->addr, tid,
1751                                      WLAN_BACK_INITIATOR);
1752
1753 timer_expired_exit:
1754         rcu_read_unlock();
1755 }
1756
1757 /*
1758  * After accepting the AddBA Request we activated a timer,
1759  * resetting it after each frame that arrives from the originator.
1760  * if this timer expires ieee80211_sta_stop_rx_ba_session will be executed.
1761  */
1762 static void sta_rx_agg_session_timer_expired(unsigned long data)
1763 {
1764         /* not an elegant detour, but there is no choice as the timer passes
1765          * only one argument, and various sta_info are needed here, so init
1766          * flow in sta_info_create gives the TID as data, while the timer_to_id
1767          * array gives the sta through container_of */
1768         u8 *ptid = (u8 *)data;
1769         u8 *timer_to_id = ptid - *ptid;
1770         struct sta_info *sta = container_of(timer_to_id, struct sta_info,
1771                                          timer_to_tid[0]);
1772
1773 #ifdef CONFIG_MAC80211_HT_DEBUG
1774         printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid);
1775 #endif
1776         ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->addr,
1777                                          (u16)*ptid, WLAN_BACK_TIMER,
1778                                          WLAN_REASON_QSTA_TIMEOUT);
1779 }
1780
1781 void ieee80211_sta_tear_down_BA_sessions(struct ieee80211_sub_if_data *sdata, u8 *addr)
1782 {
1783         struct ieee80211_local *local = sdata->local;
1784         int i;
1785
1786         for (i = 0; i <  STA_TID_NUM; i++) {
1787                 ieee80211_stop_tx_ba_session(&local->hw, addr, i,
1788                                              WLAN_BACK_INITIATOR);
1789                 ieee80211_sta_stop_rx_ba_session(sdata, addr, i,
1790                                                  WLAN_BACK_RECIPIENT,
1791                                                  WLAN_REASON_QSTA_LEAVE_QBSS);
1792         }
1793 }
1794
1795 static void ieee80211_send_refuse_measurement_request(struct ieee80211_sub_if_data *sdata,
1796                                         struct ieee80211_msrment_ie *request_ie,
1797                                         const u8 *da, const u8 *bssid,
1798                                         u8 dialog_token)
1799 {
1800         struct ieee80211_local *local = sdata->local;
1801         struct sk_buff *skb;
1802         struct ieee80211_mgmt *msr_report;
1803
1804         skb = dev_alloc_skb(sizeof(*msr_report) + local->hw.extra_tx_headroom +
1805                                 sizeof(struct ieee80211_msrment_ie));
1806
1807         if (!skb) {
1808                 printk(KERN_ERR "%s: failed to allocate buffer for "
1809                                 "measurement report frame\n", sdata->dev->name);
1810                 return;
1811         }
1812
1813         skb_reserve(skb, local->hw.extra_tx_headroom);
1814         msr_report = (struct ieee80211_mgmt *)skb_put(skb, 24);
1815         memset(msr_report, 0, 24);
1816         memcpy(msr_report->da, da, ETH_ALEN);
1817         memcpy(msr_report->sa, sdata->dev->dev_addr, ETH_ALEN);
1818         memcpy(msr_report->bssid, bssid, ETH_ALEN);
1819         msr_report->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1820                                                 IEEE80211_STYPE_ACTION);
1821
1822         skb_put(skb, 1 + sizeof(msr_report->u.action.u.measurement));
1823         msr_report->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
1824         msr_report->u.action.u.measurement.action_code =
1825                                 WLAN_ACTION_SPCT_MSR_RPRT;
1826         msr_report->u.action.u.measurement.dialog_token = dialog_token;
1827
1828         msr_report->u.action.u.measurement.element_id = WLAN_EID_MEASURE_REPORT;
1829         msr_report->u.action.u.measurement.length =
1830                         sizeof(struct ieee80211_msrment_ie);
1831
1832         memset(&msr_report->u.action.u.measurement.msr_elem, 0,
1833                 sizeof(struct ieee80211_msrment_ie));
1834         msr_report->u.action.u.measurement.msr_elem.token = request_ie->token;
1835         msr_report->u.action.u.measurement.msr_elem.mode |=
1836                         IEEE80211_SPCT_MSR_RPRT_MODE_REFUSED;
1837         msr_report->u.action.u.measurement.msr_elem.type = request_ie->type;
1838
1839         ieee80211_sta_tx(sdata, skb, 0);
1840 }
1841
1842 static void ieee80211_sta_process_measurement_req(struct ieee80211_sub_if_data *sdata,
1843                                                 struct ieee80211_mgmt *mgmt,
1844                                                 size_t len)
1845 {
1846         /*
1847          * Ignoring measurement request is spec violation.
1848          * Mandatory measurements must be reported optional
1849          * measurements might be refused or reported incapable
1850          * For now just refuse
1851          * TODO: Answer basic measurement as unmeasured
1852          */
1853         ieee80211_send_refuse_measurement_request(sdata,
1854                         &mgmt->u.action.u.measurement.msr_elem,
1855                         mgmt->sa, mgmt->bssid,
1856                         mgmt->u.action.u.measurement.dialog_token);
1857 }
1858
1859
1860 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1861                                    struct ieee80211_if_sta *ifsta,
1862                                    struct ieee80211_mgmt *mgmt,
1863                                    size_t len)
1864 {
1865         u16 auth_alg, auth_transaction, status_code;
1866         DECLARE_MAC_BUF(mac);
1867
1868         if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1869             sdata->vif.type != IEEE80211_IF_TYPE_IBSS)
1870                 return;
1871
1872         if (len < 24 + 6)
1873                 return;
1874
1875         if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
1876             memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1877                 return;
1878
1879         if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
1880             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1881                 return;
1882
1883         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1884         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1885         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1886
1887         if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
1888                 /*
1889                  * IEEE 802.11 standard does not require authentication in IBSS
1890                  * networks and most implementations do not seem to use it.
1891                  * However, try to reply to authentication attempts if someone
1892                  * has actually implemented this.
1893                  */
1894                 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1895                         return;
1896                 ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0);
1897         }
1898
1899         if (auth_alg != ifsta->auth_alg ||
1900             auth_transaction != ifsta->auth_transaction)
1901                 return;
1902
1903         if (status_code != WLAN_STATUS_SUCCESS) {
1904                 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1905                         u8 algs[3];
1906                         const int num_algs = ARRAY_SIZE(algs);
1907                         int i, pos;
1908                         algs[0] = algs[1] = algs[2] = 0xff;
1909                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1910                                 algs[0] = WLAN_AUTH_OPEN;
1911                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1912                                 algs[1] = WLAN_AUTH_SHARED_KEY;
1913                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1914                                 algs[2] = WLAN_AUTH_LEAP;
1915                         if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1916                                 pos = 0;
1917                         else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1918                                 pos = 1;
1919                         else
1920                                 pos = 2;
1921                         for (i = 0; i < num_algs; i++) {
1922                                 pos++;
1923                                 if (pos >= num_algs)
1924                                         pos = 0;
1925                                 if (algs[pos] == ifsta->auth_alg ||
1926                                     algs[pos] == 0xff)
1927                                         continue;
1928                                 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1929                                     !ieee80211_sta_wep_configured(sdata))
1930                                         continue;
1931                                 ifsta->auth_alg = algs[pos];
1932                                 break;
1933                         }
1934                 }
1935                 return;
1936         }
1937
1938         switch (ifsta->auth_alg) {
1939         case WLAN_AUTH_OPEN:
1940         case WLAN_AUTH_LEAP:
1941                 ieee80211_auth_completed(sdata, ifsta);
1942                 break;
1943         case WLAN_AUTH_SHARED_KEY:
1944                 if (ifsta->auth_transaction == 4)
1945                         ieee80211_auth_completed(sdata, ifsta);
1946                 else
1947                         ieee80211_auth_challenge(sdata, ifsta, mgmt, len);
1948                 break;
1949         }
1950 }
1951
1952
1953 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1954                                      struct ieee80211_if_sta *ifsta,
1955                                      struct ieee80211_mgmt *mgmt,
1956                                      size_t len)
1957 {
1958         u16 reason_code;
1959         DECLARE_MAC_BUF(mac);
1960
1961         if (len < 24 + 2)
1962                 return;
1963
1964         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1965                 return;
1966
1967         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1968
1969         if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
1970                 printk(KERN_DEBUG "%s: deauthenticated\n", sdata->dev->name);
1971
1972         if (ifsta->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1973             ifsta->state == IEEE80211_STA_MLME_ASSOCIATE ||
1974             ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1975                 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1976                 mod_timer(&ifsta->timer, jiffies +
1977                                       IEEE80211_RETRY_AUTH_INTERVAL);
1978         }
1979
1980         ieee80211_set_disassoc(sdata, ifsta, 1);
1981         ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1982 }
1983
1984
1985 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1986                                        struct ieee80211_if_sta *ifsta,
1987                                        struct ieee80211_mgmt *mgmt,
1988                                        size_t len)
1989 {
1990         u16 reason_code;
1991         DECLARE_MAC_BUF(mac);
1992
1993         if (len < 24 + 2)
1994                 return;
1995
1996         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1997                 return;
1998
1999         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2000
2001         if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
2002                 printk(KERN_DEBUG "%s: disassociated\n", sdata->dev->name);
2003
2004         if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
2005                 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
2006                 mod_timer(&ifsta->timer, jiffies +
2007                                       IEEE80211_RETRY_AUTH_INTERVAL);
2008         }
2009
2010         ieee80211_set_disassoc(sdata, ifsta, 0);
2011 }
2012
2013
2014 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2015                                          struct ieee80211_if_sta *ifsta,
2016                                          struct ieee80211_mgmt *mgmt,
2017                                          size_t len,
2018                                          int reassoc)
2019 {
2020         struct ieee80211_local *local = sdata->local;
2021         struct ieee80211_supported_band *sband;
2022         struct sta_info *sta;
2023         u64 rates, basic_rates;
2024         u16 capab_info, status_code, aid;
2025         struct ieee802_11_elems elems;
2026         struct ieee80211_bss_conf *bss_conf = &sdata->bss_conf;
2027         u8 *pos;
2028         int i, j;
2029         DECLARE_MAC_BUF(mac);
2030         bool have_higher_than_11mbit = false;
2031
2032         /* AssocResp and ReassocResp have identical structure, so process both
2033          * of them in this function. */
2034
2035         if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATE)
2036                 return;
2037
2038         if (len < 24 + 6)
2039                 return;
2040
2041         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
2042                 return;
2043
2044         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2045         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2046         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2047
2048         printk(KERN_DEBUG "%s: RX %sssocResp from %s (capab=0x%x "
2049                "status=%d aid=%d)\n",
2050                sdata->dev->name, reassoc ? "Rea" : "A", print_mac(mac, mgmt->sa),
2051                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2052
2053         if (status_code != WLAN_STATUS_SUCCESS) {
2054                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
2055                        sdata->dev->name, status_code);
2056                 /* if this was a reassociation, ensure we try a "full"
2057                  * association next time. This works around some broken APs
2058                  * which do not correctly reject reassociation requests. */
2059                 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2060                 return;
2061         }
2062
2063         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2064                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
2065                        "set\n", sdata->dev->name, aid);
2066         aid &= ~(BIT(15) | BIT(14));
2067
2068         pos = mgmt->u.assoc_resp.variable;
2069         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2070
2071         if (!elems.supp_rates) {
2072                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
2073                        sdata->dev->name);
2074                 return;
2075         }
2076
2077         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
2078         ifsta->aid = aid;
2079         ifsta->ap_capab = capab_info;
2080
2081         kfree(ifsta->assocresp_ies);
2082         ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
2083         ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
2084         if (ifsta->assocresp_ies)
2085                 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
2086
2087         rcu_read_lock();
2088
2089         /* Add STA entry for the AP */
2090         sta = sta_info_get(local, ifsta->bssid);
2091         if (!sta) {
2092                 struct ieee80211_sta_bss *bss;
2093                 int err;
2094
2095                 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
2096                 if (!sta) {
2097                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
2098                                " the AP\n", sdata->dev->name);
2099                         rcu_read_unlock();
2100                         return;
2101                 }
2102                 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
2103                                            local->hw.conf.channel->center_freq,
2104                                            ifsta->ssid, ifsta->ssid_len);
2105                 if (bss) {
2106                         sta->last_signal = bss->signal;
2107                         sta->last_qual = bss->qual;
2108                         sta->last_noise = bss->noise;
2109                         ieee80211_rx_bss_put(local, bss);
2110                 }
2111
2112                 err = sta_info_insert(sta);
2113                 if (err) {
2114                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
2115                                " the AP (error %d)\n", sdata->dev->name, err);
2116                         rcu_read_unlock();
2117                         return;
2118                 }
2119                 /* update new sta with its last rx activity */
2120                 sta->last_rx = jiffies;
2121         }
2122
2123         /*
2124          * FIXME: Do we really need to update the sta_info's information here?
2125          *        We already know about the AP (we found it in our list) so it
2126          *        should already be filled with the right info, no?
2127          *        As is stands, all this is racy because typically we assume
2128          *        the information that is filled in here (except flags) doesn't
2129          *        change while a STA structure is alive. As such, it should move
2130          *        to between the sta_info_alloc() and sta_info_insert() above.
2131          */
2132
2133         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
2134                            WLAN_STA_AUTHORIZED);
2135
2136         rates = 0;
2137         basic_rates = 0;
2138         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2139
2140         for (i = 0; i < elems.supp_rates_len; i++) {
2141                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
2142
2143                 if (rate > 110)
2144                         have_higher_than_11mbit = true;
2145
2146                 for (j = 0; j < sband->n_bitrates; j++) {
2147                         if (sband->bitrates[j].bitrate == rate)
2148                                 rates |= BIT(j);
2149                         if (elems.supp_rates[i] & 0x80)
2150                                 basic_rates |= BIT(j);
2151                 }
2152         }
2153
2154         for (i = 0; i < elems.ext_supp_rates_len; i++) {
2155                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
2156
2157                 if (rate > 110)
2158                         have_higher_than_11mbit = true;
2159
2160                 for (j = 0; j < sband->n_bitrates; j++) {
2161                         if (sband->bitrates[j].bitrate == rate)
2162                                 rates |= BIT(j);
2163                         if (elems.ext_supp_rates[i] & 0x80)
2164                                 basic_rates |= BIT(j);
2165                 }
2166         }
2167
2168         sta->supp_rates[local->hw.conf.channel->band] = rates;
2169         sdata->basic_rates = basic_rates;
2170
2171         /* cf. IEEE 802.11 9.2.12 */
2172         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
2173             have_higher_than_11mbit)
2174                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
2175         else
2176                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
2177
2178         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
2179             (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
2180                 struct ieee80211_ht_bss_info bss_info;
2181                 ieee80211_ht_cap_ie_to_ht_info(
2182                                 (struct ieee80211_ht_cap *)
2183                                 elems.ht_cap_elem, &sta->ht_info);
2184                 ieee80211_ht_addt_info_ie_to_ht_bss_info(
2185                                 (struct ieee80211_ht_addt_info *)
2186                                 elems.ht_info_elem, &bss_info);
2187                 ieee80211_handle_ht(local, 1, &sta->ht_info, &bss_info);
2188         }
2189
2190         rate_control_rate_init(sta, local);
2191
2192         if (elems.wmm_param) {
2193                 set_sta_flags(sta, WLAN_STA_WME);
2194                 rcu_read_unlock();
2195                 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
2196                                          elems.wmm_param_len);
2197         } else
2198                 rcu_read_unlock();
2199
2200         /* set AID and assoc capability,
2201          * ieee80211_set_associated() will tell the driver */
2202         bss_conf->aid = aid;
2203         bss_conf->assoc_capability = capab_info;
2204         ieee80211_set_associated(sdata, ifsta, 1);
2205
2206         ieee80211_associated(sdata, ifsta);
2207 }
2208
2209
2210 /* Caller must hold local->sta_bss_lock */
2211 static void __ieee80211_rx_bss_hash_add(struct ieee80211_local *local,
2212                                         struct ieee80211_sta_bss *bss)
2213 {
2214         u8 hash_idx;
2215
2216         if (bss_mesh_cfg(bss))
2217                 hash_idx = mesh_id_hash(bss_mesh_id(bss),
2218                                         bss_mesh_id_len(bss));
2219         else
2220                 hash_idx = STA_HASH(bss->bssid);
2221
2222         bss->hnext = local->sta_bss_hash[hash_idx];
2223         local->sta_bss_hash[hash_idx] = bss;
2224 }
2225
2226
2227 /* Caller must hold local->sta_bss_lock */
2228 static void __ieee80211_rx_bss_hash_del(struct ieee80211_local *local,
2229                                         struct ieee80211_sta_bss *bss)
2230 {
2231         struct ieee80211_sta_bss *b, *prev = NULL;
2232         b = local->sta_bss_hash[STA_HASH(bss->bssid)];
2233         while (b) {
2234                 if (b == bss) {
2235                         if (!prev)
2236                                 local->sta_bss_hash[STA_HASH(bss->bssid)] =
2237                                         bss->hnext;
2238                         else
2239                                 prev->hnext = bss->hnext;
2240                         break;
2241                 }
2242                 prev = b;
2243                 b = b->hnext;
2244         }
2245 }
2246
2247
2248 static struct ieee80211_sta_bss *
2249 ieee80211_rx_bss_add(struct ieee80211_sub_if_data *sdata, u8 *bssid, int freq,
2250                      u8 *ssid, u8 ssid_len)
2251 {
2252         struct ieee80211_local *local = sdata->local;
2253         struct ieee80211_sta_bss *bss;
2254
2255         bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
2256         if (!bss)
2257                 return NULL;
2258         atomic_inc(&bss->users);
2259         atomic_inc(&bss->users);
2260         memcpy(bss->bssid, bssid, ETH_ALEN);
2261         bss->freq = freq;
2262         if (ssid && ssid_len <= IEEE80211_MAX_SSID_LEN) {
2263                 memcpy(bss->ssid, ssid, ssid_len);
2264                 bss->ssid_len = ssid_len;
2265         }
2266
2267         spin_lock_bh(&local->sta_bss_lock);
2268         /* TODO: order by RSSI? */
2269         list_add_tail(&bss->list, &local->sta_bss_list);
2270         __ieee80211_rx_bss_hash_add(local, bss);
2271         spin_unlock_bh(&local->sta_bss_lock);
2272         return bss;
2273 }
2274
2275 static struct ieee80211_sta_bss *
2276 ieee80211_rx_bss_get(struct ieee80211_local *local, u8 *bssid, int freq,
2277                      u8 *ssid, u8 ssid_len)
2278 {
2279         struct ieee80211_sta_bss *bss;
2280
2281         spin_lock_bh(&local->sta_bss_lock);
2282         bss = local->sta_bss_hash[STA_HASH(bssid)];
2283         while (bss) {
2284                 if (!bss_mesh_cfg(bss) &&
2285                     !memcmp(bss->bssid, bssid, ETH_ALEN) &&
2286                     bss->freq == freq &&
2287                     bss->ssid_len == ssid_len &&
2288                     (ssid_len == 0 || !memcmp(bss->ssid, ssid, ssid_len))) {
2289                         atomic_inc(&bss->users);
2290                         break;
2291                 }
2292                 bss = bss->hnext;
2293         }
2294         spin_unlock_bh(&local->sta_bss_lock);
2295         return bss;
2296 }
2297
2298 #ifdef CONFIG_MAC80211_MESH
2299 static struct ieee80211_sta_bss *
2300 ieee80211_rx_mesh_bss_get(struct ieee80211_local *local, u8 *mesh_id, int mesh_id_len,
2301                           u8 *mesh_cfg, int freq)
2302 {
2303         struct ieee80211_sta_bss *bss;
2304
2305         spin_lock_bh(&local->sta_bss_lock);
2306         bss = local->sta_bss_hash[mesh_id_hash(mesh_id, mesh_id_len)];
2307         while (bss) {
2308                 if (bss_mesh_cfg(bss) &&
2309                     !memcmp(bss_mesh_cfg(bss), mesh_cfg, MESH_CFG_CMP_LEN) &&
2310                     bss->freq == freq &&
2311                     mesh_id_len == bss->mesh_id_len &&
2312                     (mesh_id_len == 0 || !memcmp(bss->mesh_id, mesh_id,
2313                                                  mesh_id_len))) {
2314                         atomic_inc(&bss->users);
2315                         break;
2316                 }
2317                 bss = bss->hnext;
2318         }
2319         spin_unlock_bh(&local->sta_bss_lock);
2320         return bss;
2321 }
2322
2323 static struct ieee80211_sta_bss *
2324 ieee80211_rx_mesh_bss_add(struct ieee80211_local *local, u8 *mesh_id, int mesh_id_len,
2325                           u8 *mesh_cfg, int mesh_config_len, int freq)
2326 {
2327         struct ieee80211_sta_bss *bss;
2328
2329         if (mesh_config_len != MESH_CFG_LEN)
2330                 return NULL;
2331
2332         bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
2333         if (!bss)
2334                 return NULL;
2335
2336         bss->mesh_cfg = kmalloc(MESH_CFG_CMP_LEN, GFP_ATOMIC);
2337         if (!bss->mesh_cfg) {
2338                 kfree(bss);
2339                 return NULL;
2340         }
2341
2342         if (mesh_id_len && mesh_id_len <= IEEE80211_MAX_MESH_ID_LEN) {
2343                 bss->mesh_id = kmalloc(mesh_id_len, GFP_ATOMIC);
2344                 if (!bss->mesh_id) {
2345                         kfree(bss->mesh_cfg);
2346                         kfree(bss);
2347                         return NULL;
2348                 }
2349                 memcpy(bss->mesh_id, mesh_id, mesh_id_len);
2350         }
2351
2352         atomic_inc(&bss->users);
2353         atomic_inc(&bss->users);
2354         memcpy(bss->mesh_cfg, mesh_cfg, MESH_CFG_CMP_LEN);
2355         bss->mesh_id_len = mesh_id_len;
2356         bss->freq = freq;
2357         spin_lock_bh(&local->sta_bss_lock);
2358         /* TODO: order by RSSI? */
2359         list_add_tail(&bss->list, &local->sta_bss_list);
2360         __ieee80211_rx_bss_hash_add(local, bss);
2361         spin_unlock_bh(&local->sta_bss_lock);
2362         return bss;
2363 }
2364 #endif
2365
2366 static void ieee80211_rx_bss_free(struct ieee80211_sta_bss *bss)
2367 {
2368         kfree(bss->ies);
2369         kfree(bss_mesh_id(bss));
2370         kfree(bss_mesh_cfg(bss));
2371         kfree(bss);
2372 }
2373
2374
2375 static void ieee80211_rx_bss_put(struct ieee80211_local *local,
2376                                  struct ieee80211_sta_bss *bss)
2377 {
2378         local_bh_disable();
2379         if (!atomic_dec_and_lock(&bss->users, &local->sta_bss_lock)) {
2380                 local_bh_enable();
2381                 return;
2382         }
2383
2384         __ieee80211_rx_bss_hash_del(local, bss);
2385         list_del(&bss->list);
2386         spin_unlock_bh(&local->sta_bss_lock);
2387         ieee80211_rx_bss_free(bss);
2388 }
2389
2390
2391 void ieee80211_rx_bss_list_init(struct ieee80211_local *local)
2392 {
2393         spin_lock_init(&local->sta_bss_lock);
2394         INIT_LIST_HEAD(&local->sta_bss_list);
2395 }
2396
2397
2398 void ieee80211_rx_bss_list_deinit(struct ieee80211_local *local)
2399 {
2400         struct ieee80211_sta_bss *bss, *tmp;
2401
2402         list_for_each_entry_safe(bss, tmp, &local->sta_bss_list, list)
2403                 ieee80211_rx_bss_put(local, bss);
2404 }
2405
2406
2407 static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
2408                                    struct ieee80211_if_sta *ifsta,
2409                                    struct ieee80211_sta_bss *bss)
2410 {
2411         struct ieee80211_local *local = sdata->local;
2412         int res, rates, i, j;
2413         struct sk_buff *skb;
2414         struct ieee80211_mgmt *mgmt;
2415         u8 *pos;
2416         struct ieee80211_supported_band *sband;
2417         union iwreq_data wrqu;
2418
2419         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2420
2421         /* Remove possible STA entries from other IBSS networks. */
2422         sta_info_flush_delayed(sdata);
2423
2424         if (local->ops->reset_tsf) {
2425                 /* Reset own TSF to allow time synchronization work. */
2426                 local->ops->reset_tsf(local_to_hw(local));
2427         }
2428         memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
2429         res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
2430         if (res)
2431                 return res;
2432
2433         local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
2434
2435         sdata->drop_unencrypted = bss->capability &
2436                 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
2437
2438         res = ieee80211_set_freq(sdata, bss->freq);
2439
2440         if (res)
2441                 return res;
2442
2443         /* Build IBSS probe response */
2444         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
2445         if (skb) {
2446                 skb_reserve(skb, local->hw.extra_tx_headroom);
2447
2448                 mgmt = (struct ieee80211_mgmt *)
2449                         skb_put(skb, 24 + sizeof(mgmt->u.beacon));
2450                 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
2451                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2452                                                   IEEE80211_STYPE_PROBE_RESP);
2453                 memset(mgmt->da, 0xff, ETH_ALEN);
2454                 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
2455                 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
2456                 mgmt->u.beacon.beacon_int =
2457                         cpu_to_le16(local->hw.conf.beacon_int);
2458                 mgmt->u.beacon.timestamp = cpu_to_le64(bss->timestamp);
2459                 mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
2460
2461                 pos = skb_put(skb, 2 + ifsta->ssid_len);
2462                 *pos++ = WLAN_EID_SSID;
2463                 *pos++ = ifsta->ssid_len;
2464                 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
2465
2466                 rates = bss->supp_rates_len;
2467                 if (rates > 8)
2468                         rates = 8;
2469                 pos = skb_put(skb, 2 + rates);
2470                 *pos++ = WLAN_EID_SUPP_RATES;
2471                 *pos++ = rates;
2472                 memcpy(pos, bss->supp_rates, rates);
2473
2474                 if (bss->band == IEEE80211_BAND_2GHZ) {
2475                         pos = skb_put(skb, 2 + 1);
2476                         *pos++ = WLAN_EID_DS_PARAMS;
2477                         *pos++ = 1;
2478                         *pos++ = ieee80211_frequency_to_channel(bss->freq);
2479                 }
2480
2481                 pos = skb_put(skb, 2 + 2);
2482                 *pos++ = WLAN_EID_IBSS_PARAMS;
2483                 *pos++ = 2;
2484                 /* FIX: set ATIM window based on scan results */
2485                 *pos++ = 0;
2486                 *pos++ = 0;
2487
2488                 if (bss->supp_rates_len > 8) {
2489                         rates = bss->supp_rates_len - 8;
2490                         pos = skb_put(skb, 2 + rates);
2491                         *pos++ = WLAN_EID_EXT_SUPP_RATES;
2492                         *pos++ = rates;
2493                         memcpy(pos, &bss->supp_rates[8], rates);
2494                 }
2495
2496                 ifsta->probe_resp = skb;
2497
2498                 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
2499         }
2500
2501         rates = 0;
2502         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2503         for (i = 0; i < bss->supp_rates_len; i++) {
2504                 int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
2505                 for (j = 0; j < sband->n_bitrates; j++)
2506                         if (sband->bitrates[j].bitrate == bitrate)
2507                                 rates |= BIT(j);
2508         }
2509         ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
2510
2511         ieee80211_sta_def_wmm_params(sdata, bss, 1);
2512
2513         ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED;
2514         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
2515
2516         memset(&wrqu, 0, sizeof(wrqu));
2517         memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
2518         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
2519
2520         return res;
2521 }
2522
2523 u64 ieee80211_sta_get_rates(struct ieee80211_local *local,
2524                             struct ieee802_11_elems *elems,
2525                             enum ieee80211_band band)
2526 {
2527         struct ieee80211_supported_band *sband;
2528         struct ieee80211_rate *bitrates;
2529         size_t num_rates;
2530         u64 supp_rates;
2531         int i, j;
2532         sband = local->hw.wiphy->bands[band];
2533
2534         if (!sband) {
2535                 WARN_ON(1);
2536                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2537         }
2538
2539         bitrates = sband->bitrates;
2540         num_rates = sband->n_bitrates;
2541         supp_rates = 0;
2542         for (i = 0; i < elems->supp_rates_len +
2543                      elems->ext_supp_rates_len; i++) {
2544                 u8 rate = 0;
2545                 int own_rate;
2546                 if (i < elems->supp_rates_len)
2547                         rate = elems->supp_rates[i];
2548                 else if (elems->ext_supp_rates)
2549                         rate = elems->ext_supp_rates
2550                                 [i - elems->supp_rates_len];
2551                 own_rate = 5 * (rate & 0x7f);
2552                 for (j = 0; j < num_rates; j++)
2553                         if (bitrates[j].bitrate == own_rate)
2554                                 supp_rates |= BIT(j);
2555         }
2556         return supp_rates;
2557 }
2558
2559 static u64 ieee80211_sta_get_mandatory_rates(struct ieee80211_local *local,
2560                                         enum ieee80211_band band)
2561 {
2562         struct ieee80211_supported_band *sband;
2563         struct ieee80211_rate *bitrates;
2564         u64 mandatory_rates;
2565         enum ieee80211_rate_flags mandatory_flag;
2566         int i;
2567
2568         sband = local->hw.wiphy->bands[band];
2569         if (!sband) {
2570                 WARN_ON(1);
2571                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2572         }
2573
2574         if (band == IEEE80211_BAND_2GHZ)
2575                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
2576         else
2577                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
2578
2579         bitrates = sband->bitrates;
2580         mandatory_rates = 0;
2581         for (i = 0; i < sband->n_bitrates; i++)
2582                 if (bitrates[i].flags & mandatory_flag)
2583                         mandatory_rates |= BIT(i);
2584         return mandatory_rates;
2585 }
2586
2587 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2588                                   struct ieee80211_mgmt *mgmt,
2589                                   size_t len,
2590                                   struct ieee80211_rx_status *rx_status,
2591                                   struct ieee802_11_elems *elems)
2592 {
2593         struct ieee80211_local *local = sdata->local;
2594         int freq, clen;
2595         struct ieee80211_sta_bss *bss;
2596         struct sta_info *sta;
2597         struct ieee80211_channel *channel;
2598         u64 beacon_timestamp, rx_timestamp;
2599         u64 supp_rates = 0;
2600         bool beacon = ieee80211_is_beacon(mgmt->frame_control);
2601         enum ieee80211_band band = rx_status->band;
2602         DECLARE_MAC_BUF(mac);
2603         DECLARE_MAC_BUF(mac2);
2604
2605         if (elems->ds_params && elems->ds_params_len == 1)
2606                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
2607         else
2608                 freq = rx_status->freq;
2609
2610         channel = ieee80211_get_channel(local->hw.wiphy, freq);
2611
2612         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2613                 return;
2614
2615         if (ieee80211_vif_is_mesh(&sdata->vif) && elems->mesh_id &&
2616             elems->mesh_config && mesh_matches_local(elems, sdata)) {
2617                 supp_rates = ieee80211_sta_get_rates(local, elems, band);
2618
2619                 mesh_neighbour_update(mgmt->sa, supp_rates, sdata,
2620                                       mesh_peer_accepts_plinks(elems));
2621         }
2622
2623         if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS && elems->supp_rates &&
2624             memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
2625                 supp_rates = ieee80211_sta_get_rates(local, elems, band);
2626
2627                 rcu_read_lock();
2628
2629                 sta = sta_info_get(local, mgmt->sa);
2630                 if (sta) {
2631                         u64 prev_rates;
2632
2633                         prev_rates = sta->supp_rates[band];
2634                         /* make sure mandatory rates are always added */
2635                         sta->supp_rates[band] = supp_rates |
2636                                 ieee80211_sta_get_mandatory_rates(local, band);
2637
2638 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2639                         if (sta->supp_rates[band] != prev_rates)
2640                                 printk(KERN_DEBUG "%s: updated supp_rates set "
2641                                     "for %s based on beacon info (0x%llx | "
2642                                     "0x%llx -> 0x%llx)\n",
2643                                     sdata->dev->name, print_mac(mac, sta->addr),
2644                                     (unsigned long long) prev_rates,
2645                                     (unsigned long long) supp_rates,
2646                                     (unsigned long long) sta->supp_rates[band]);
2647 #endif
2648                 } else {
2649                         ieee80211_ibss_add_sta(sdata, NULL, mgmt->bssid,
2650                                                mgmt->sa, supp_rates);
2651                 }
2652
2653                 rcu_read_unlock();
2654         }
2655
2656 #ifdef CONFIG_MAC80211_MESH
2657         if (elems->mesh_config)
2658                 bss = ieee80211_rx_mesh_bss_get(local, elems->mesh_id,
2659                                 elems->mesh_id_len, elems->mesh_config, freq);
2660         else
2661 #endif
2662                 bss = ieee80211_rx_bss_get(local, mgmt->bssid, freq,
2663                                            elems->ssid, elems->ssid_len);
2664         if (!bss) {
2665 #ifdef CONFIG_MAC80211_MESH
2666                 if (elems->mesh_config)
2667                         bss = ieee80211_rx_mesh_bss_add(local, elems->mesh_id,
2668                                 elems->mesh_id_len, elems->mesh_config,
2669                                 elems->mesh_config_len, freq);
2670                 else
2671 #endif
2672                         bss = ieee80211_rx_bss_add(sdata, mgmt->bssid, freq,
2673                                                   elems->ssid, elems->ssid_len);
2674                 if (!bss)
2675                         return;
2676         } else {
2677 #if 0
2678                 /* TODO: order by RSSI? */
2679                 spin_lock_bh(&local->sta_bss_lock);
2680                 list_move_tail(&bss->list, &local->sta_bss_list);
2681                 spin_unlock_bh(&local->sta_bss_lock);
2682 #endif
2683         }
2684
2685         /* save the ERP value so that it is available at association time */
2686         if (elems->erp_info && elems->erp_info_len >= 1) {
2687                 bss->erp_value = elems->erp_info[0];
2688                 bss->has_erp_value = 1;
2689         }
2690
2691         bss->beacon_int = le16_to_cpu(mgmt->u.beacon.beacon_int);
2692         bss->capability = le16_to_cpu(mgmt->u.beacon.capab_info);
2693
2694         if (elems->tim) {
2695                 struct ieee80211_tim_ie *tim_ie =
2696                         (struct ieee80211_tim_ie *)elems->tim;
2697                 bss->dtim_period = tim_ie->dtim_period;
2698         }
2699
2700         /* set default value for buggy APs */
2701         if (!elems->tim || bss->dtim_period == 0)
2702                 bss->dtim_period = 1;
2703
2704         bss->supp_rates_len = 0;
2705         if (elems->supp_rates) {
2706                 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
2707                 if (clen > elems->supp_rates_len)
2708                         clen = elems->supp_rates_len;
2709                 memcpy(&bss->supp_rates[bss->supp_rates_len], elems->supp_rates,
2710                        clen);
2711                 bss->supp_rates_len += clen;
2712         }
2713         if (elems->ext_supp_rates) {
2714                 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
2715                 if (clen > elems->ext_supp_rates_len)
2716                         clen = elems->ext_supp_rates_len;
2717                 memcpy(&bss->supp_rates[bss->supp_rates_len],
2718                        elems->ext_supp_rates, clen);
2719                 bss->supp_rates_len += clen;
2720         }
2721
2722         bss->band = band;
2723
2724         beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
2725
2726         bss->timestamp = beacon_timestamp;
2727         bss->last_update = jiffies;
2728         bss->signal = rx_status->signal;
2729         bss->noise = rx_status->noise;
2730         bss->qual = rx_status->qual;
2731         if (!beacon)
2732                 bss->last_probe_resp = jiffies;
2733         /*
2734          * In STA mode, the remaining parameters should not be overridden
2735          * by beacons because they're not necessarily accurate there.
2736          */
2737         if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
2738             bss->last_probe_resp && beacon) {
2739                 ieee80211_rx_bss_put(local, bss);
2740                 return;
2741         }
2742
2743         if (bss->ies == NULL || bss->ies_len < elems->total_len) {
2744                 kfree(bss->ies);
2745                 bss->ies = kmalloc(elems->total_len, GFP_ATOMIC);
2746         }
2747         if (bss->ies) {
2748                 memcpy(bss->ies, elems->ie_start, elems->total_len);
2749                 bss->ies_len = elems->total_len;
2750         } else
2751                 bss->ies_len = 0;
2752
2753         bss->wmm_used = elems->wmm_param || elems->wmm_info;
2754
2755         /* check if we need to merge IBSS */
2756         if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS && beacon &&
2757             !local->sta_sw_scanning && !local->sta_hw_scanning &&
2758             bss->capability & WLAN_CAPABILITY_IBSS &&
2759             bss->freq == local->oper_channel->center_freq &&
2760             elems->ssid_len == sdata->u.sta.ssid_len &&
2761             memcmp(elems->ssid, sdata->u.sta.ssid,
2762                                 sdata->u.sta.ssid_len) == 0) {
2763                 if (rx_status->flag & RX_FLAG_TSFT) {
2764                         /* in order for correct IBSS merging we need mactime
2765                          *
2766                          * since mactime is defined as the time the first data
2767                          * symbol of the frame hits the PHY, and the timestamp
2768                          * of the beacon is defined as "the time that the data
2769                          * symbol containing the first bit of the timestamp is
2770                          * transmitted to the PHY plus the transmitting STA’s
2771                          * delays through its local PHY from the MAC-PHY
2772                          * interface to its interface with the WM"
2773                          * (802.11 11.1.2) - equals the time this bit arrives at
2774                          * the receiver - we have to take into account the
2775                          * offset between the two.
2776                          * e.g: at 1 MBit that means mactime is 192 usec earlier
2777                          * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
2778                          */
2779                         int rate = local->hw.wiphy->bands[band]->
2780                                         bitrates[rx_status->rate_idx].bitrate;
2781                         rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
2782                 } else if (local && local->ops && local->ops->get_tsf)
2783                         /* second best option: get current TSF */
2784                         rx_timestamp = local->ops->get_tsf(local_to_hw(local));
2785                 else
2786                         /* can't merge without knowing the TSF */
2787                         rx_timestamp = -1LLU;
2788 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2789                 printk(KERN_DEBUG "RX beacon SA=%s BSSID="
2790                        "%s TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
2791                        print_mac(mac, mgmt->sa),
2792                        print_mac(mac2, mgmt->bssid),
2793                        (unsigned long long)rx_timestamp,
2794                        (unsigned long long)beacon_timestamp,
2795                        (unsigned long long)(rx_timestamp - beacon_timestamp),
2796                        jiffies);
2797 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2798                 if (beacon_timestamp > rx_timestamp) {
2799 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2800                         printk(KERN_DEBUG "%s: beacon TSF higher than "
2801                                "local TSF - IBSS merge with BSSID %s\n",
2802                                sdata->dev->name, print_mac(mac, mgmt->bssid));
2803 #endif
2804                         ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss);
2805                         ieee80211_ibss_add_sta(sdata, NULL,
2806                                                mgmt->bssid, mgmt->sa,
2807                                                supp_rates);
2808                 }
2809         }
2810
2811         ieee80211_rx_bss_put(local, bss);
2812 }
2813
2814
2815 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2816                                          struct ieee80211_mgmt *mgmt,
2817                                          size_t len,
2818                                          struct ieee80211_rx_status *rx_status)
2819 {
2820         size_t baselen;
2821         struct ieee802_11_elems elems;
2822         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2823
2824         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
2825                 return; /* ignore ProbeResp to foreign address */
2826
2827         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2828         if (baselen > len)
2829                 return;
2830
2831         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2832                                 &elems);
2833
2834         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2835
2836         /* direct probe may be part of the association flow */
2837         if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
2838                                                         &ifsta->request)) {
2839                 printk(KERN_DEBUG "%s direct probe responded\n",
2840                        sdata->dev->name);
2841                 ieee80211_authenticate(sdata, ifsta);
2842         }
2843 }
2844
2845
2846 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2847                                      struct ieee80211_mgmt *mgmt,
2848                                      size_t len,
2849                                      struct ieee80211_rx_status *rx_status)
2850 {
2851         struct ieee80211_if_sta *ifsta;
2852         size_t baselen;
2853         struct ieee802_11_elems elems;
2854         struct ieee80211_local *local = sdata->local;
2855         struct ieee80211_conf *conf = &local->hw.conf;
2856         u32 changed = 0;
2857
2858         /* Process beacon from the current BSS */
2859         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2860         if (baselen > len)
2861                 return;
2862
2863         ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
2864
2865         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2866
2867         if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
2868                 return;
2869         ifsta = &sdata->u.sta;
2870
2871         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
2872             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
2873                 return;
2874
2875         /* Do not send changes to driver if we are scanning. This removes
2876          * requirement that a driver's bss_info_changed/conf_tx functions
2877          * need to be atomic.
2878          * This is really ugly code, we should rewrite scanning and make
2879          * all this more understandable for humans.
2880          */
2881         if (local->sta_sw_scanning || local->sta_hw_scanning)
2882                 return;
2883
2884         ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
2885                                  elems.wmm_param_len);
2886
2887         if (elems.erp_info && elems.erp_info_len >= 1)
2888                 changed |= ieee80211_handle_erp_ie(sdata, elems.erp_info[0]);
2889         else {
2890                 u16 capab = le16_to_cpu(mgmt->u.beacon.capab_info);
2891                 changed |= ieee80211_handle_protect_preamb(sdata, false,
2892                                 (capab & WLAN_CAPABILITY_SHORT_PREAMBLE) != 0);
2893         }
2894
2895         if (elems.ht_cap_elem && elems.ht_info_elem &&
2896             elems.wmm_param && conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) {
2897                 struct ieee80211_ht_bss_info bss_info;
2898
2899                 ieee80211_ht_addt_info_ie_to_ht_bss_info(
2900                                 (struct ieee80211_ht_addt_info *)
2901                                 elems.ht_info_elem, &bss_info);
2902                 changed |= ieee80211_handle_ht(local, 1, &conf->ht_conf,
2903                                                &bss_info);
2904         }
2905
2906         ieee80211_bss_info_change_notify(sdata, changed);
2907 }
2908
2909
2910 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
2911                                         struct ieee80211_if_sta *ifsta,
2912                                         struct ieee80211_mgmt *mgmt,
2913                                         size_t len,
2914                                         struct ieee80211_rx_status *rx_status)
2915 {
2916         struct ieee80211_local *local = sdata->local;
2917         int tx_last_beacon;
2918         struct sk_buff *skb;
2919         struct ieee80211_mgmt *resp;
2920         u8 *pos, *end;
2921         DECLARE_MAC_BUF(mac);
2922 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2923         DECLARE_MAC_BUF(mac2);
2924         DECLARE_MAC_BUF(mac3);
2925 #endif
2926
2927         if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS ||
2928             ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED ||
2929             len < 24 + 2 || !ifsta->probe_resp)
2930                 return;
2931
2932         if (local->ops->tx_last_beacon)
2933                 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
2934         else
2935                 tx_last_beacon = 1;
2936
2937 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2938         printk(KERN_DEBUG "%s: RX ProbeReq SA=%s DA=%s BSSID="
2939                "%s (tx_last_beacon=%d)\n",
2940                sdata->dev->name, print_mac(mac, mgmt->sa), print_mac(mac2, mgmt->da),
2941                print_mac(mac3, mgmt->bssid), tx_last_beacon);
2942 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2943
2944         if (!tx_last_beacon)
2945                 return;
2946
2947         if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
2948             memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
2949                 return;
2950
2951         end = ((u8 *) mgmt) + len;
2952         pos = mgmt->u.probe_req.variable;
2953         if (pos[0] != WLAN_EID_SSID ||
2954             pos + 2 + pos[1] > end) {
2955 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2956                 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
2957                        "from %s\n",
2958                        sdata->dev->name, print_mac(mac, mgmt->sa));
2959 #endif
2960                 return;
2961         }
2962         if (pos[1] != 0 &&
2963             (pos[1] != ifsta->ssid_len ||
2964              memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
2965                 /* Ignore ProbeReq for foreign SSID */
2966                 return;
2967         }
2968
2969         /* Reply with ProbeResp */
2970         skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
2971         if (!skb)
2972                 return;
2973
2974         resp = (struct ieee80211_mgmt *) skb->data;
2975         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2976 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2977         printk(KERN_DEBUG "%s: Sending ProbeResp to %s\n",
2978                sdata->dev->name, print_mac(mac, resp->da));
2979 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2980         ieee80211_sta_tx(sdata, skb, 0);
2981 }
2982
2983 static void ieee80211_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
2984                                      struct ieee80211_if_sta *ifsta,
2985                                      struct ieee80211_mgmt *mgmt,
2986                                      size_t len,
2987                                      struct ieee80211_rx_status *rx_status)
2988 {
2989         struct ieee80211_local *local = sdata->local;
2990
2991         if (len < IEEE80211_MIN_ACTION_SIZE)
2992                 return;
2993
2994         switch (mgmt->u.action.category) {
2995         case WLAN_CATEGORY_SPECTRUM_MGMT:
2996                 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
2997                         break;
2998                 switch (mgmt->u.action.u.chan_switch.action_code) {
2999                 case WLAN_ACTION_SPCT_MSR_REQ:
3000                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3001                                    sizeof(mgmt->u.action.u.measurement)))
3002                                 break;
3003                         ieee80211_sta_process_measurement_req(sdata, mgmt, len);
3004                         break;
3005                 }
3006                 break;
3007         case WLAN_CATEGORY_BACK:
3008                 switch (mgmt->u.action.u.addba_req.action_code) {
3009                 case WLAN_ACTION_ADDBA_REQ:
3010                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3011                                    sizeof(mgmt->u.action.u.addba_req)))
3012                                 break;
3013                         ieee80211_sta_process_addba_request(local, mgmt, len);
3014                         break;
3015                 case WLAN_ACTION_ADDBA_RESP:
3016                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3017                                    sizeof(mgmt->u.action.u.addba_resp)))
3018                                 break;
3019                         ieee80211_sta_process_addba_resp(local, mgmt, len);
3020                         break;
3021                 case WLAN_ACTION_DELBA:
3022                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3023                                    sizeof(mgmt->u.action.u.delba)))
3024                                 break;
3025                         ieee80211_sta_process_delba(sdata, mgmt, len);
3026                         break;
3027                 }
3028                 break;
3029         case PLINK_CATEGORY:
3030                 if (ieee80211_vif_is_mesh(&sdata->vif))
3031                         mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
3032                 break;
3033         case MESH_PATH_SEL_CATEGORY:
3034                 if (ieee80211_vif_is_mesh(&sdata->vif))
3035                         mesh_rx_path_sel_frame(sdata, mgmt, len);
3036                 break;
3037         }
3038 }
3039
3040 void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
3041                            struct ieee80211_rx_status *rx_status)
3042 {
3043         struct ieee80211_local *local = sdata->local;
3044         struct ieee80211_if_sta *ifsta;
3045         struct ieee80211_mgmt *mgmt;
3046         u16 fc;
3047
3048         if (skb->len < 24)
3049                 goto fail;
3050
3051         ifsta = &sdata->u.sta;
3052
3053         mgmt = (struct ieee80211_mgmt *) skb->data;
3054         fc = le16_to_cpu(mgmt->frame_control);
3055
3056         switch (fc & IEEE80211_FCTL_STYPE) {
3057         case IEEE80211_STYPE_PROBE_REQ:
3058         case IEEE80211_STYPE_PROBE_RESP:
3059         case IEEE80211_STYPE_BEACON:
3060         case IEEE80211_STYPE_ACTION:
3061                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
3062         case IEEE80211_STYPE_AUTH:
3063         case IEEE80211_STYPE_ASSOC_RESP:
3064         case IEEE80211_STYPE_REASSOC_RESP:
3065         case IEEE80211_STYPE_DEAUTH:
3066         case IEEE80211_STYPE_DISASSOC:
3067                 skb_queue_tail(&ifsta->skb_queue, skb);
3068                 queue_work(local->hw.workqueue, &ifsta->work);
3069                 return;
3070         }
3071
3072  fail:
3073         kfree_skb(skb);
3074 }
3075
3076 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3077                                          struct sk_buff *skb)
3078 {
3079         struct ieee80211_rx_status *rx_status;
3080         struct ieee80211_if_sta *ifsta;
3081         struct ieee80211_mgmt *mgmt;
3082         u16 fc;
3083
3084         ifsta = &sdata->u.sta;
3085
3086         rx_status = (struct ieee80211_rx_status *) skb->cb;
3087         mgmt = (struct ieee80211_mgmt *) skb->data;
3088         fc = le16_to_cpu(mgmt->frame_control);
3089
3090         switch (fc & IEEE80211_FCTL_STYPE) {
3091         case IEEE80211_STYPE_PROBE_REQ:
3092                 ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len,
3093                                             rx_status);
3094                 break;
3095         case IEEE80211_STYPE_PROBE_RESP:
3096                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
3097                 break;
3098         case IEEE80211_STYPE_BEACON:
3099                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3100                 break;
3101         case IEEE80211_STYPE_AUTH:
3102                 ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len);
3103                 break;
3104         case IEEE80211_STYPE_ASSOC_RESP:
3105                 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
3106                 break;
3107         case IEEE80211_STYPE_REASSOC_RESP:
3108                 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
3109                 break;
3110         case IEEE80211_STYPE_DEAUTH:
3111                 ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len);
3112                 break;
3113         case IEEE80211_STYPE_DISASSOC:
3114                 ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len);
3115                 break;
3116         case IEEE80211_STYPE_ACTION:
3117                 ieee80211_rx_mgmt_action(sdata, ifsta, mgmt, skb->len, rx_status);
3118                 break;
3119         }
3120
3121         kfree_skb(skb);
3122 }
3123
3124
3125 ieee80211_rx_result
3126 ieee80211_sta_rx_scan(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
3127                       struct ieee80211_rx_status *rx_status)
3128 {
3129         struct ieee80211_mgmt *mgmt;
3130         __le16 fc;
3131
3132         if (skb->len < 2)
3133                 return RX_DROP_UNUSABLE;
3134
3135         mgmt = (struct ieee80211_mgmt *) skb->data;
3136         fc = mgmt->frame_control;
3137
3138         if (ieee80211_is_ctl(fc))
3139                 return RX_CONTINUE;
3140
3141         if (skb->len < 24)
3142                 return RX_DROP_MONITOR;
3143
3144         if (ieee80211_is_probe_resp(fc)) {
3145                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
3146                 dev_kfree_skb(skb);
3147                 return RX_QUEUED;
3148         }
3149
3150         if (ieee80211_is_beacon(fc)) {
3151                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3152                 dev_kfree_skb(skb);
3153                 return RX_QUEUED;
3154         }
3155
3156         return RX_CONTINUE;
3157 }
3158
3159
3160 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
3161 {
3162         struct ieee80211_local *local = sdata->local;
3163         int active = 0;
3164         struct sta_info *sta;
3165
3166         rcu_read_lock();
3167
3168         list_for_each_entry_rcu(sta, &local->sta_list, list) {
3169                 if (sta->sdata == sdata &&
3170                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
3171                                jiffies)) {
3172                         active++;
3173                         break;
3174                 }
3175         }
3176
3177         rcu_read_unlock();
3178
3179         return active;
3180 }
3181
3182
3183 static void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata, unsigned long exp_time)
3184 {
3185         struct ieee80211_local *local = sdata->local;
3186         struct sta_info *sta, *tmp;
3187         LIST_HEAD(tmp_list);
3188         DECLARE_MAC_BUF(mac);
3189         unsigned long flags;
3190
3191         spin_lock_irqsave(&local->sta_lock, flags);
3192         list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
3193                 if (time_after(jiffies, sta->last_rx + exp_time)) {
3194 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3195                         printk(KERN_DEBUG "%s: expiring inactive STA %s\n",
3196                                sdata->dev->name, print_mac(mac, sta->addr));
3197 #endif
3198                         __sta_info_unlink(&sta);
3199                         if (sta)
3200                                 list_add(&sta->list, &tmp_list);
3201                 }
3202         spin_unlock_irqrestore(&local->sta_lock, flags);
3203
3204         list_for_each_entry_safe(sta, tmp, &tmp_list, list)
3205                 sta_info_destroy(sta);
3206 }
3207
3208
3209 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
3210                                      struct ieee80211_if_sta *ifsta)
3211 {
3212         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
3213
3214         ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
3215         if (ieee80211_sta_active_ibss(sdata))
3216                 return;
3217
3218         printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
3219                "IBSS networks with same SSID (merge)\n", sdata->dev->name);
3220         ieee80211_sta_req_scan(sdata, ifsta->ssid, ifsta->ssid_len);
3221 }
3222
3223
3224 #ifdef CONFIG_MAC80211_MESH
3225 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
3226                            struct ieee80211_if_sta *ifsta)
3227 {
3228         bool free_plinks;
3229
3230         ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
3231         mesh_path_expire(sdata);
3232
3233         free_plinks = mesh_plink_availables(sdata);
3234         if (free_plinks != sdata->u.sta.accepting_plinks)
3235                 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
3236
3237         mod_timer(&ifsta->timer, jiffies +
3238                         IEEE80211_MESH_HOUSEKEEPING_INTERVAL);
3239 }
3240
3241
3242 void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
3243 {
3244         struct ieee80211_if_sta *ifsta;
3245         ifsta = &sdata->u.sta;
3246         ifsta->state = IEEE80211_STA_MLME_MESH_UP;
3247         ieee80211_sta_timer((unsigned long)sdata);
3248         ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
3249 }
3250 #endif
3251
3252
3253 void ieee80211_sta_timer(unsigned long data)
3254 {
3255         struct ieee80211_sub_if_data *sdata =
3256                 (struct ieee80211_sub_if_data *) data;
3257         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3258         struct ieee80211_local *local = sdata->local;
3259
3260         set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
3261         queue_work(local->hw.workqueue, &ifsta->work);
3262 }
3263
3264 void ieee80211_sta_work(struct work_struct *work)
3265 {
3266         struct ieee80211_sub_if_data *sdata =
3267                 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
3268         struct ieee80211_local *local = sdata->local;
3269         struct ieee80211_if_sta *ifsta;
3270         struct sk_buff *skb;
3271
3272         if (!netif_running(sdata->dev))
3273                 return;
3274
3275         if (local->sta_sw_scanning || local->sta_hw_scanning)
3276                 return;
3277
3278         if (WARN_ON(sdata->vif.type != IEEE80211_IF_TYPE_STA &&
3279                     sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
3280                     sdata->vif.type != IEEE80211_IF_TYPE_MESH_POINT))
3281                 return;
3282         ifsta = &sdata->u.sta;
3283
3284         while ((skb = skb_dequeue(&ifsta->skb_queue)))
3285                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
3286
3287 #ifdef CONFIG_MAC80211_MESH
3288         if (ifsta->preq_queue_len &&
3289             time_after(jiffies,
3290                        ifsta->last_preq + msecs_to_jiffies(ifsta->mshcfg.dot11MeshHWMPpreqMinInterval)))
3291                 mesh_path_start_discovery(sdata);
3292 #endif
3293
3294         if (ifsta->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
3295             ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
3296             ifsta->state != IEEE80211_STA_MLME_ASSOCIATE &&
3297             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
3298                 if (ifsta->scan_ssid_len)
3299                         ieee80211_sta_start_scan(sdata, ifsta->scan_ssid, ifsta->scan_ssid_len);
3300                 else
3301                         ieee80211_sta_start_scan(sdata, NULL, 0);
3302                 return;
3303         }
3304
3305         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
3306                 if (ieee80211_sta_config_auth(sdata, ifsta))
3307                         return;
3308                 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
3309         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
3310                 return;
3311
3312         switch (ifsta->state) {
3313         case IEEE80211_STA_MLME_DISABLED:
3314                 break;
3315         case IEEE80211_STA_MLME_DIRECT_PROBE:
3316                 ieee80211_direct_probe(sdata, ifsta);
3317                 break;
3318         case IEEE80211_STA_MLME_AUTHENTICATE:
3319                 ieee80211_authenticate(sdata, ifsta);
3320                 break;
3321         case IEEE80211_STA_MLME_ASSOCIATE:
3322                 ieee80211_associate(sdata, ifsta);
3323                 break;
3324         case IEEE80211_STA_MLME_ASSOCIATED:
3325                 ieee80211_associated(sdata, ifsta);
3326                 break;
3327         case IEEE80211_STA_MLME_IBSS_SEARCH:
3328                 ieee80211_sta_find_ibss(sdata, ifsta);
3329                 break;
3330         case IEEE80211_STA_MLME_IBSS_JOINED:
3331                 ieee80211_sta_merge_ibss(sdata, ifsta);
3332                 break;
3333 #ifdef CONFIG_MAC80211_MESH
3334         case IEEE80211_STA_MLME_MESH_UP:
3335                 ieee80211_mesh_housekeeping(sdata, ifsta);
3336                 break;
3337 #endif
3338         default:
3339                 WARN_ON(1);
3340                 break;
3341         }
3342
3343         if (ieee80211_privacy_mismatch(sdata, ifsta)) {
3344                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
3345                        "mixed-cell disabled - disassociate\n", sdata->dev->name);
3346
3347                 ieee80211_send_disassoc(sdata, ifsta, WLAN_REASON_UNSPECIFIED);
3348                 ieee80211_set_disassoc(sdata, ifsta, 0);
3349         }
3350 }
3351
3352
3353 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata,
3354                                      struct ieee80211_if_sta *ifsta)
3355 {
3356         struct ieee80211_local *local = sdata->local;
3357
3358         if (local->ops->reset_tsf) {
3359                 /* Reset own TSF to allow time synchronization work. */
3360                 local->ops->reset_tsf(local_to_hw(local));
3361         }
3362
3363         ifsta->wmm_last_param_set = -1; /* allow any WMM update */
3364
3365
3366         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
3367                 ifsta->auth_alg = WLAN_AUTH_OPEN;
3368         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
3369                 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
3370         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
3371                 ifsta->auth_alg = WLAN_AUTH_LEAP;
3372         else
3373                 ifsta->auth_alg = WLAN_AUTH_OPEN;
3374         ifsta->auth_transaction = -1;
3375         ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
3376         ifsta->assoc_scan_tries = 0;
3377         ifsta->direct_probe_tries = 0;
3378         ifsta->auth_tries = 0;
3379         ifsta->assoc_tries = 0;
3380         netif_carrier_off(sdata->dev);
3381 }
3382
3383
3384 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata,
3385                             struct ieee80211_if_sta *ifsta)
3386 {
3387         struct ieee80211_local *local = sdata->local;
3388
3389         if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
3390                 return;
3391
3392         if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
3393                                 IEEE80211_STA_AUTO_BSSID_SEL)) &&
3394             (ifsta->flags & (IEEE80211_STA_SSID_SET |
3395                                 IEEE80211_STA_AUTO_SSID_SEL))) {
3396                 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
3397                 queue_work(local->hw.workqueue, &ifsta->work);
3398         }
3399 }
3400
3401 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
3402                                     const char *ssid, int ssid_len)
3403 {
3404         int tmp, hidden_ssid;
3405
3406         if (ssid_len == ifsta->ssid_len &&
3407             !memcmp(ifsta->ssid, ssid, ssid_len))
3408                 return 1;
3409
3410         if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
3411                 return 0;
3412
3413         hidden_ssid = 1;
3414         tmp = ssid_len;
3415         while (tmp--) {
3416                 if (ssid[tmp] != '\0') {
3417                         hidden_ssid = 0;
3418                         break;
3419                 }
3420         }
3421
3422         if (hidden_ssid && ifsta->ssid_len == ssid_len)
3423                 return 1;
3424
3425         if (ssid_len == 1 && ssid[0] == ' ')
3426                 return 1;
3427
3428         return 0;
3429 }
3430
3431 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
3432                                      struct ieee80211_if_sta *ifsta)
3433 {
3434         struct ieee80211_local *local = sdata->local;
3435         struct ieee80211_sta_bss *bss, *selected = NULL;
3436         int top_rssi = 0, freq;
3437
3438         spin_lock_bh(&local->sta_bss_lock);
3439         freq = local->oper_channel->center_freq;
3440         list_for_each_entry(bss, &local->sta_bss_list, list) {
3441                 if (!(bss->capability & WLAN_CAPABILITY_ESS))
3442                         continue;
3443
3444                 if ((ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
3445                         IEEE80211_STA_AUTO_BSSID_SEL |
3446                         IEEE80211_STA_AUTO_CHANNEL_SEL)) &&
3447                     (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
3448                      !!sdata->default_key))
3449                         continue;
3450
3451                 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
3452                     bss->freq != freq)
3453                         continue;
3454
3455                 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
3456                     memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
3457                         continue;
3458
3459                 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
3460                     !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
3461                         continue;
3462
3463                 if (!selected || top_rssi < bss->signal) {
3464                         selected = bss;
3465                         top_rssi = bss->signal;
3466                 }
3467         }
3468         if (selected)
3469                 atomic_inc(&selected->users);
3470         spin_unlock_bh(&local->sta_bss_lock);
3471
3472         if (selected) {
3473                 ieee80211_set_freq(sdata, selected->freq);
3474                 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
3475                         ieee80211_sta_set_ssid(sdata, selected->ssid,
3476                                                selected->ssid_len);
3477                 ieee80211_sta_set_bssid(sdata, selected->bssid);
3478                 ieee80211_sta_def_wmm_params(sdata, selected, 0);
3479
3480                 /* Send out direct probe if no probe resp was received or
3481                  * the one we have is outdated
3482                  */
3483                 if (!selected->last_probe_resp ||
3484                     time_after(jiffies, selected->last_probe_resp
3485                                         + IEEE80211_SCAN_RESULT_EXPIRE))
3486                         ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
3487                 else
3488                         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
3489
3490                 ieee80211_rx_bss_put(local, selected);
3491                 ieee80211_sta_reset_auth(sdata, ifsta);
3492                 return 0;
3493         } else {
3494                 if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
3495                         ifsta->assoc_scan_tries++;
3496                         if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
3497                                 ieee80211_sta_start_scan(sdata, NULL, 0);
3498                         else
3499                                 ieee80211_sta_start_scan(sdata, ifsta->ssid,
3500                                                          ifsta->ssid_len);
3501                         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
3502                         set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
3503                 } else
3504                         ifsta->state = IEEE80211_STA_MLME_DISABLED;
3505         }
3506         return -1;
3507 }
3508
3509
3510 static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata,
3511                                      struct ieee80211_if_sta *ifsta)
3512 {
3513         struct ieee80211_local *local = sdata->local;
3514         struct ieee80211_sta_bss *bss;
3515         struct ieee80211_supported_band *sband;
3516         u8 bssid[ETH_ALEN], *pos;
3517         int i;
3518         int ret;
3519         DECLARE_MAC_BUF(mac);
3520
3521 #if 0
3522         /* Easier testing, use fixed BSSID. */
3523         memset(bssid, 0xfe, ETH_ALEN);
3524 #else
3525         /* Generate random, not broadcast, locally administered BSSID. Mix in
3526          * own MAC address to make sure that devices that do not have proper
3527          * random number generator get different BSSID. */
3528         get_random_bytes(bssid, ETH_ALEN);
3529         for (i = 0; i < ETH_ALEN; i++)
3530                 bssid[i] ^= sdata->dev->dev_addr[i];
3531         bssid[0] &= ~0x01;
3532         bssid[0] |= 0x02;
3533 #endif
3534
3535         printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %s\n",
3536                sdata->dev->name, print_mac(mac, bssid));
3537
3538         bss = ieee80211_rx_bss_add(sdata, bssid,
3539                                    local->hw.conf.channel->center_freq,
3540                                    sdata->u.sta.ssid, sdata->u.sta.ssid_len);
3541         if (!bss)
3542                 return -ENOMEM;
3543
3544         bss->band = local->hw.conf.channel->band;
3545         sband = local->hw.wiphy->bands[bss->band];
3546
3547         if (local->hw.conf.beacon_int == 0)
3548                 local->hw.conf.beacon_int = 100;
3549         bss->beacon_int = local->hw.conf.beacon_int;
3550         bss->last_update = jiffies;
3551         bss->capability = WLAN_CAPABILITY_IBSS;
3552
3553         if (sdata->default_key)
3554                 bss->capability |= WLAN_CAPABILITY_PRIVACY;
3555         else
3556                 sdata->drop_unencrypted = 0;
3557
3558         bss->supp_rates_len = sband->n_bitrates;
3559         pos = bss->supp_rates;
3560         for (i = 0; i < sband->n_bitrates; i++) {
3561                 int rate = sband->bitrates[i].bitrate;
3562                 *pos++ = (u8) (rate / 5);
3563         }
3564
3565         ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
3566         ieee80211_rx_bss_put(local, bss);
3567         return ret;
3568 }
3569
3570
3571 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
3572                                    struct ieee80211_if_sta *ifsta)
3573 {
3574         struct ieee80211_local *local = sdata->local;
3575         struct ieee80211_sta_bss *bss;
3576         int found = 0;
3577         u8 bssid[ETH_ALEN];
3578         int active_ibss;
3579         DECLARE_MAC_BUF(mac);
3580         DECLARE_MAC_BUF(mac2);
3581
3582         if (ifsta->ssid_len == 0)
3583                 return -EINVAL;
3584
3585         active_ibss = ieee80211_sta_active_ibss(sdata);
3586 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3587         printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
3588                sdata->dev->name, active_ibss);
3589 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3590         spin_lock_bh(&local->sta_bss_lock);
3591         list_for_each_entry(bss, &local->sta_bss_list, list) {
3592                 if (ifsta->ssid_len != bss->ssid_len ||
3593                     memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
3594                     || !(bss->capability & WLAN_CAPABILITY_IBSS))
3595                         continue;
3596 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3597                 printk(KERN_DEBUG "   bssid=%s found\n",
3598                        print_mac(mac, bss->bssid));
3599 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3600                 memcpy(bssid, bss->bssid, ETH_ALEN);
3601                 found = 1;
3602                 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
3603                         break;
3604         }
3605         spin_unlock_bh(&local->sta_bss_lock);
3606
3607 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3608         if (found)
3609                 printk(KERN_DEBUG "   sta_find_ibss: selected %s current "
3610                        "%s\n", print_mac(mac, bssid),
3611                        print_mac(mac2, ifsta->bssid));
3612 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3613
3614         if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
3615                 int ret;
3616                 int search_freq;
3617
3618                 if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
3619                         search_freq = bss->freq;
3620                 else
3621                         search_freq = local->hw.conf.channel->center_freq;
3622
3623                 bss = ieee80211_rx_bss_get(local, bssid, search_freq,
3624                                            ifsta->ssid, ifsta->ssid_len);
3625                 if (!bss)
3626                         goto dont_join;
3627
3628                 printk(KERN_DEBUG "%s: Selected IBSS BSSID %s"
3629                        " based on configured SSID\n",
3630                        sdata->dev->name, print_mac(mac, bssid));
3631                 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
3632                 ieee80211_rx_bss_put(local, bss);
3633                 return ret;
3634         }
3635
3636 dont_join:
3637 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3638         printk(KERN_DEBUG "   did not try to join ibss\n");
3639 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3640
3641         /* Selected IBSS not found in current scan results - try to scan */
3642         if (ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED &&
3643             !ieee80211_sta_active_ibss(sdata)) {
3644                 mod_timer(&ifsta->timer, jiffies +
3645                                       IEEE80211_IBSS_MERGE_INTERVAL);
3646         } else if (time_after(jiffies, local->last_scan_completed +
3647                               IEEE80211_SCAN_INTERVAL)) {
3648                 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
3649                        "join\n", sdata->dev->name);
3650                 return ieee80211_sta_req_scan(sdata, ifsta->ssid,
3651                                               ifsta->ssid_len);
3652         } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) {
3653                 int interval = IEEE80211_SCAN_INTERVAL;
3654
3655                 if (time_after(jiffies, ifsta->ibss_join_req +
3656                                IEEE80211_IBSS_JOIN_TIMEOUT)) {
3657                         if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
3658                             (!(local->oper_channel->flags &
3659                                         IEEE80211_CHAN_NO_IBSS)))
3660                                 return ieee80211_sta_create_ibss(sdata, ifsta);
3661                         if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
3662                                 printk(KERN_DEBUG "%s: IBSS not allowed on"
3663                                        " %d MHz\n", sdata->dev->name,
3664                                        local->hw.conf.channel->center_freq);
3665                         }
3666
3667                         /* No IBSS found - decrease scan interval and continue
3668                          * scanning. */
3669                         interval = IEEE80211_SCAN_INTERVAL_SLOW;
3670                 }
3671
3672                 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
3673                 mod_timer(&ifsta->timer, jiffies + interval);
3674                 return 0;
3675         }
3676
3677         return 0;
3678 }
3679
3680
3681 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
3682 {
3683         struct ieee80211_if_sta *ifsta;
3684         int res;
3685
3686         if (len > IEEE80211_MAX_SSID_LEN)
3687                 return -EINVAL;
3688
3689         ifsta = &sdata->u.sta;
3690
3691         if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) {
3692                 memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
3693                 memcpy(ifsta->ssid, ssid, len);
3694                 ifsta->ssid_len = len;
3695                 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
3696
3697                 res = 0;
3698                 /*
3699                  * Hack! MLME code needs to be cleaned up to have different
3700                  * entry points for configuration and internal selection change
3701                  */
3702                 if (netif_running(sdata->dev))
3703                         res = ieee80211_if_config(sdata, IEEE80211_IFCC_SSID);
3704                 if (res) {
3705                         printk(KERN_DEBUG "%s: Failed to config new SSID to "
3706                                "the low-level driver\n", sdata->dev->name);
3707                         return res;
3708                 }
3709         }
3710
3711         if (len)
3712                 ifsta->flags |= IEEE80211_STA_SSID_SET;
3713         else
3714                 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
3715
3716         if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
3717             !(ifsta->flags & IEEE80211_STA_BSSID_SET)) {
3718                 ifsta->ibss_join_req = jiffies;
3719                 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
3720                 return ieee80211_sta_find_ibss(sdata, ifsta);
3721         }
3722
3723         return 0;
3724 }
3725
3726
3727 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
3728 {
3729         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3730         memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
3731         *len = ifsta->ssid_len;
3732         return 0;
3733 }
3734
3735
3736 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
3737 {
3738         struct ieee80211_if_sta *ifsta;
3739         int res;
3740
3741         ifsta = &sdata->u.sta;
3742
3743         if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
3744                 memcpy(ifsta->bssid, bssid, ETH_ALEN);
3745                 res = 0;
3746                 /*
3747                  * Hack! See also ieee80211_sta_set_ssid.
3748                  */
3749                 if (netif_running(sdata->dev))
3750                         res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
3751                 if (res) {
3752                         printk(KERN_DEBUG "%s: Failed to config new BSSID to "
3753                                "the low-level driver\n", sdata->dev->name);
3754                         return res;
3755                 }
3756         }
3757
3758         if (is_valid_ether_addr(bssid))
3759                 ifsta->flags |= IEEE80211_STA_BSSID_SET;
3760         else
3761                 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
3762
3763         return 0;
3764 }
3765
3766
3767 static void ieee80211_send_nullfunc(struct ieee80211_local *local,
3768                                     struct ieee80211_sub_if_data *sdata,
3769                                     int powersave)
3770 {
3771         struct sk_buff *skb;
3772         struct ieee80211_hdr *nullfunc;
3773         __le16 fc;
3774
3775         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
3776         if (!skb) {
3777                 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
3778                        "frame\n", sdata->dev->name);
3779                 return;
3780         }
3781         skb_reserve(skb, local->hw.extra_tx_headroom);
3782
3783         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
3784         memset(nullfunc, 0, 24);
3785         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
3786                          IEEE80211_FCTL_TODS);
3787         if (powersave)
3788                 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
3789         nullfunc->frame_control = fc;
3790         memcpy(nullfunc->addr1, sdata->u.sta.bssid, ETH_ALEN);
3791         memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
3792         memcpy(nullfunc->addr3, sdata->u.sta.bssid, ETH_ALEN);
3793
3794         ieee80211_sta_tx(sdata, skb, 0);
3795 }
3796
3797
3798 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3799 {
3800         if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
3801             ieee80211_vif_is_mesh(&sdata->vif))
3802                 ieee80211_sta_timer((unsigned long)sdata);
3803 }
3804
3805 void ieee80211_scan_completed(struct ieee80211_hw *hw)
3806 {
3807         struct ieee80211_local *local = hw_to_local(hw);
3808         struct net_device *dev = local->scan_dev;
3809         struct ieee80211_sub_if_data *sdata;
3810         union iwreq_data wrqu;
3811
3812         local->last_scan_completed = jiffies;
3813         memset(&wrqu, 0, sizeof(wrqu));
3814         wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL);
3815
3816         if (local->sta_hw_scanning) {
3817                 local->sta_hw_scanning = 0;
3818                 if (ieee80211_hw_config(local))
3819                         printk(KERN_DEBUG "%s: failed to restore operational "
3820                                "channel after scan\n", dev->name);
3821                 /* Restart STA timer for HW scan case */
3822                 rcu_read_lock();
3823                 list_for_each_entry_rcu(sdata, &local->interfaces, list)
3824                         ieee80211_restart_sta_timer(sdata);
3825                 rcu_read_unlock();
3826
3827                 goto done;
3828         }
3829
3830         local->sta_sw_scanning = 0;
3831         if (ieee80211_hw_config(local))
3832                 printk(KERN_DEBUG "%s: failed to restore operational "
3833                        "channel after scan\n", dev->name);
3834
3835
3836         netif_tx_lock_bh(local->mdev);
3837         netif_addr_lock(local->mdev);
3838         local->filter_flags &= ~FIF_BCN_PRBRESP_PROMISC;
3839         local->ops->configure_filter(local_to_hw(local),
3840                                      FIF_BCN_PRBRESP_PROMISC,
3841                                      &local->filter_flags,
3842                                      local->mdev->mc_count,
3843                                      local->mdev->mc_list);
3844
3845         netif_addr_unlock(local->mdev);
3846         netif_tx_unlock_bh(local->mdev);
3847
3848         rcu_read_lock();
3849         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3850                 /* Tell AP we're back */
3851                 if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
3852                     sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED)
3853                         ieee80211_send_nullfunc(local, sdata, 0);
3854
3855                 ieee80211_restart_sta_timer(sdata);
3856
3857                 netif_wake_queue(sdata->dev);
3858         }
3859         rcu_read_unlock();
3860
3861 done:
3862         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3863         if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
3864                 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3865                 if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) ||
3866                     (!(ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED) &&
3867                     !ieee80211_sta_active_ibss(sdata)))
3868                         ieee80211_sta_find_ibss(sdata, ifsta);
3869         }
3870 }
3871 EXPORT_SYMBOL(ieee80211_scan_completed);
3872
3873 void ieee80211_sta_scan_work(struct work_struct *work)
3874 {
3875         struct ieee80211_local *local =
3876                 container_of(work, struct ieee80211_local, scan_work.work);
3877         struct net_device *dev = local->scan_dev;
3878         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3879         struct ieee80211_supported_band *sband;
3880         struct ieee80211_channel *chan;
3881         int skip;
3882         unsigned long next_delay = 0;
3883
3884         if (!local->sta_sw_scanning)
3885                 return;
3886
3887         switch (local->scan_state) {
3888         case SCAN_SET_CHANNEL:
3889                 /*
3890                  * Get current scan band. scan_band may be IEEE80211_NUM_BANDS
3891                  * after we successfully scanned the last channel of the last
3892                  * band (and the last band is supported by the hw)
3893                  */
3894                 if (local->scan_band < IEEE80211_NUM_BANDS)
3895                         sband = local->hw.wiphy->bands[local->scan_band];
3896                 else
3897                         sband = NULL;
3898
3899                 /*
3900                  * If we are at an unsupported band and have more bands
3901                  * left to scan, advance to the next supported one.
3902                  */
3903                 while (!sband && local->scan_band < IEEE80211_NUM_BANDS - 1) {
3904                         local->scan_band++;
3905                         sband = local->hw.wiphy->bands[local->scan_band];
3906                         local->scan_channel_idx = 0;
3907                 }
3908
3909                 /* if no more bands/channels left, complete scan */
3910                 if (!sband || local->scan_channel_idx >= sband->n_channels) {
3911                         ieee80211_scan_completed(local_to_hw(local));
3912                         return;
3913                 }
3914                 skip = 0;
3915                 chan = &sband->channels[local->scan_channel_idx];
3916
3917                 if (chan->flags & IEEE80211_CHAN_DISABLED ||
3918                     (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
3919                      chan->flags & IEEE80211_CHAN_NO_IBSS))
3920                         skip = 1;
3921
3922                 if (!skip) {
3923                         local->scan_channel = chan;
3924                         if (ieee80211_hw_config(local)) {
3925                                 printk(KERN_DEBUG "%s: failed to set freq to "
3926                                        "%d MHz for scan\n", dev->name,
3927                                        chan->center_freq);
3928                                 skip = 1;
3929                         }
3930                 }
3931
3932                 /* advance state machine to next channel/band */
3933                 local->scan_channel_idx++;
3934                 if (local->scan_channel_idx >= sband->n_channels) {
3935                         /*
3936                          * scan_band may end up == IEEE80211_NUM_BANDS, but
3937                          * we'll catch that case above and complete the scan
3938                          * if that is the case.
3939                          */
3940                         local->scan_band++;
3941                         local->scan_channel_idx = 0;
3942                 }
3943
3944                 if (skip)
3945                         break;
3946
3947                 next_delay = IEEE80211_PROBE_DELAY +
3948                              usecs_to_jiffies(local->hw.channel_change_time);
3949                 local->scan_state = SCAN_SEND_PROBE;
3950                 break;
3951         case SCAN_SEND_PROBE:
3952                 next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
3953                 local->scan_state = SCAN_SET_CHANNEL;
3954
3955                 if (local->scan_channel->flags & IEEE80211_CHAN_PASSIVE_SCAN)
3956                         break;
3957                 ieee80211_send_probe_req(sdata, NULL, local->scan_ssid,
3958                                          local->scan_ssid_len);
3959                 next_delay = IEEE80211_CHANNEL_TIME;
3960                 break;
3961         }
3962
3963         if (local->sta_sw_scanning)
3964                 queue_delayed_work(local->hw.workqueue, &local->scan_work,
3965                                    next_delay);
3966 }
3967
3968
3969 static int ieee80211_sta_start_scan(struct ieee80211_sub_if_data *scan_sdata,
3970                                     u8 *ssid, size_t ssid_len)
3971 {
3972         struct ieee80211_local *local = scan_sdata->local;
3973         struct ieee80211_sub_if_data *sdata;
3974
3975         if (ssid_len > IEEE80211_MAX_SSID_LEN)
3976                 return -EINVAL;
3977
3978         /* MLME-SCAN.request (page 118)  page 144 (11.1.3.1)
3979          * BSSType: INFRASTRUCTURE, INDEPENDENT, ANY_BSS
3980          * BSSID: MACAddress
3981          * SSID
3982          * ScanType: ACTIVE, PASSIVE
3983          * ProbeDelay: delay (in microseconds) to be used prior to transmitting
3984          *    a Probe frame during active scanning
3985          * ChannelList
3986          * MinChannelTime (>= ProbeDelay), in TU
3987          * MaxChannelTime: (>= MinChannelTime), in TU
3988          */
3989
3990          /* MLME-SCAN.confirm
3991           * BSSDescriptionSet
3992           * ResultCode: SUCCESS, INVALID_PARAMETERS
3993          */
3994
3995         if (local->sta_sw_scanning || local->sta_hw_scanning) {
3996                 if (local->scan_dev == scan_sdata->dev)
3997                         return 0;
3998                 return -EBUSY;
3999         }
4000
4001         if (local->ops->hw_scan) {
4002                 int rc = local->ops->hw_scan(local_to_hw(local),
4003                                              ssid, ssid_len);
4004                 if (!rc) {
4005                         local->sta_hw_scanning = 1;
4006                         local->scan_dev = scan_sdata->dev;
4007                 }
4008                 return rc;
4009         }
4010
4011         local->sta_sw_scanning = 1;
4012
4013         rcu_read_lock();
4014         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4015                 netif_stop_queue(sdata->dev);
4016                 if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
4017                     (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED))
4018                         ieee80211_send_nullfunc(local, sdata, 1);
4019         }
4020         rcu_read_unlock();
4021
4022         if (ssid) {
4023                 local->scan_ssid_len = ssid_len;
4024                 memcpy(local->scan_ssid, ssid, ssid_len);
4025         } else
4026                 local->scan_ssid_len = 0;
4027         local->scan_state = SCAN_SET_CHANNEL;
4028         local->scan_channel_idx = 0;
4029         local->scan_band = IEEE80211_BAND_2GHZ;
4030         local->scan_dev = scan_sdata->dev;
4031
4032         netif_addr_lock_bh(local->mdev);
4033         local->filter_flags |= FIF_BCN_PRBRESP_PROMISC;
4034         local->ops->configure_filter(local_to_hw(local),
4035                                      FIF_BCN_PRBRESP_PROMISC,
4036                                      &local->filter_flags,
4037                                      local->mdev->mc_count,
4038                                      local->mdev->mc_list);
4039         netif_addr_unlock_bh(local->mdev);
4040
4041         /* TODO: start scan as soon as all nullfunc frames are ACKed */
4042         queue_delayed_work(local->hw.workqueue, &local->scan_work,
4043                            IEEE80211_CHANNEL_TIME);
4044
4045         return 0;
4046 }
4047
4048
4049 int ieee80211_sta_req_scan(struct ieee80211_sub_if_data *sdata, u8 *ssid, size_t ssid_len)
4050 {
4051         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
4052         struct ieee80211_local *local = sdata->local;
4053
4054         if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
4055                 return ieee80211_sta_start_scan(sdata, ssid, ssid_len);
4056
4057         if (local->sta_sw_scanning || local->sta_hw_scanning) {
4058                 if (local->scan_dev == sdata->dev)
4059                         return 0;
4060                 return -EBUSY;
4061         }
4062
4063         ifsta->scan_ssid_len = ssid_len;
4064         if (ssid_len)
4065                 memcpy(ifsta->scan_ssid, ssid, ssid_len);
4066         set_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request);
4067         queue_work(local->hw.workqueue, &ifsta->work);
4068         return 0;
4069 }
4070
4071
4072 static void ieee80211_sta_add_scan_ies(struct iw_request_info *info,
4073                                        struct ieee80211_sta_bss *bss,
4074                                        char **current_ev, char *end_buf)
4075 {
4076         u8 *pos, *end, *next;
4077         struct iw_event iwe;
4078
4079         if (bss == NULL || bss->ies == NULL)
4080                 return;
4081
4082         /*
4083          * If needed, fragment the IEs buffer (at IE boundaries) into short
4084          * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
4085          */
4086         pos = bss->ies;
4087         end = pos + bss->ies_len;
4088
4089         while (end - pos > IW_GENERIC_IE_MAX) {
4090                 next = pos + 2 + pos[1];
4091                 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
4092                         next = next + 2 + next[1];
4093
4094                 memset(&iwe, 0, sizeof(iwe));
4095                 iwe.cmd = IWEVGENIE;
4096                 iwe.u.data.length = next - pos;
4097                 *current_ev = iwe_stream_add_point(info, *current_ev,
4098                                                    end_buf, &iwe, pos);
4099
4100                 pos = next;
4101         }
4102
4103         if (end > pos) {
4104                 memset(&iwe, 0, sizeof(iwe));
4105                 iwe.cmd = IWEVGENIE;
4106                 iwe.u.data.length = end - pos;
4107                 *current_ev = iwe_stream_add_point(info, *current_ev,
4108                                                    end_buf, &iwe, pos);
4109         }
4110 }
4111
4112
4113 static char *
4114 ieee80211_sta_scan_result(struct ieee80211_local *local,
4115                           struct iw_request_info *info,
4116                           struct ieee80211_sta_bss *bss,
4117                           char *current_ev, char *end_buf)
4118 {
4119         struct iw_event iwe;
4120
4121         if (time_after(jiffies,
4122                        bss->last_update + IEEE80211_SCAN_RESULT_EXPIRE))
4123                 return current_ev;
4124
4125         memset(&iwe, 0, sizeof(iwe));
4126         iwe.cmd = SIOCGIWAP;
4127         iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
4128         memcpy(iwe.u.ap_addr.sa_data, bss->bssid, ETH_ALEN);
4129         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
4130                                           IW_EV_ADDR_LEN);
4131
4132         memset(&iwe, 0, sizeof(iwe));
4133         iwe.cmd = SIOCGIWESSID;
4134         if (bss_mesh_cfg(bss)) {
4135                 iwe.u.data.length = bss_mesh_id_len(bss);
4136                 iwe.u.data.flags = 1;
4137                 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
4138                                                   &iwe, bss_mesh_id(bss));
4139         } else {
4140                 iwe.u.data.length = bss->ssid_len;
4141                 iwe.u.data.flags = 1;
4142                 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
4143                                                   &iwe, bss->ssid);
4144         }
4145
4146         if (bss->capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)
4147             || bss_mesh_cfg(bss)) {
4148                 memset(&iwe, 0, sizeof(iwe));
4149                 iwe.cmd = SIOCGIWMODE;
4150                 if (bss_mesh_cfg(bss))
4151                         iwe.u.mode = IW_MODE_MESH;
4152                 else if (bss->capability & WLAN_CAPABILITY_ESS)
4153                         iwe.u.mode = IW_MODE_MASTER;
4154                 else
4155                         iwe.u.mode = IW_MODE_ADHOC;
4156                 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
4157                                                   &iwe, IW_EV_UINT_LEN);
4158         }
4159
4160         memset(&iwe, 0, sizeof(iwe));
4161         iwe.cmd = SIOCGIWFREQ;
4162         iwe.u.freq.m = ieee80211_frequency_to_channel(bss->freq);
4163         iwe.u.freq.e = 0;
4164         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
4165                                           IW_EV_FREQ_LEN);
4166
4167         memset(&iwe, 0, sizeof(iwe));
4168         iwe.cmd = SIOCGIWFREQ;
4169         iwe.u.freq.m = bss->freq;
4170         iwe.u.freq.e = 6;
4171         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
4172                                           IW_EV_FREQ_LEN);
4173         memset(&iwe, 0, sizeof(iwe));
4174         iwe.cmd = IWEVQUAL;
4175         iwe.u.qual.qual = bss->qual;
4176         iwe.u.qual.level = bss->signal;
4177         iwe.u.qual.noise = bss->noise;
4178         iwe.u.qual.updated = local->wstats_flags;
4179         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
4180                                           IW_EV_QUAL_LEN);
4181
4182         memset(&iwe, 0, sizeof(iwe));
4183         iwe.cmd = SIOCGIWENCODE;
4184         if (bss->capability & WLAN_CAPABILITY_PRIVACY)
4185                 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
4186         else
4187                 iwe.u.data.flags = IW_ENCODE_DISABLED;
4188         iwe.u.data.length = 0;
4189         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
4190                                           &iwe, "");
4191
4192         ieee80211_sta_add_scan_ies(info, bss, &current_ev, end_buf);
4193
4194         if (bss && bss->supp_rates_len > 0) {
4195                 /* display all supported rates in readable format */
4196                 char *p = current_ev + iwe_stream_lcp_len(info);
4197                 int i;
4198
4199                 memset(&iwe, 0, sizeof(iwe));
4200                 iwe.cmd = SIOCGIWRATE;
4201                 /* Those two flags are ignored... */
4202                 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
4203
4204                 for (i = 0; i < bss->supp_rates_len; i++) {
4205                         iwe.u.bitrate.value = ((bss->supp_rates[i] &
4206                                                         0x7f) * 500000);
4207                         p = iwe_stream_add_value(info, current_ev, p,
4208                                         end_buf, &iwe, IW_EV_PARAM_LEN);
4209                 }
4210                 current_ev = p;
4211         }
4212
4213         if (bss) {
4214                 char *buf;
4215                 buf = kmalloc(30, GFP_ATOMIC);
4216                 if (buf) {
4217                         memset(&iwe, 0, sizeof(iwe));
4218                         iwe.cmd = IWEVCUSTOM;
4219                         sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->timestamp));
4220                         iwe.u.data.length = strlen(buf);
4221                         current_ev = iwe_stream_add_point(info, current_ev,
4222                                                           end_buf,
4223                                                           &iwe, buf);
4224                         memset(&iwe, 0, sizeof(iwe));
4225                         iwe.cmd = IWEVCUSTOM;
4226                         sprintf(buf, " Last beacon: %dms ago",
4227                                 jiffies_to_msecs(jiffies - bss->last_update));
4228                         iwe.u.data.length = strlen(buf);
4229                         current_ev = iwe_stream_add_point(info, current_ev,
4230                                                           end_buf, &iwe, buf);
4231                         kfree(buf);
4232                 }
4233         }
4234
4235         if (bss_mesh_cfg(bss)) {
4236                 char *buf;
4237                 u8 *cfg = bss_mesh_cfg(bss);
4238                 buf = kmalloc(50, GFP_ATOMIC);
4239                 if (buf) {
4240                         memset(&iwe, 0, sizeof(iwe));
4241                         iwe.cmd = IWEVCUSTOM;
4242                         sprintf(buf, "Mesh network (version %d)", cfg[0]);
4243                         iwe.u.data.length = strlen(buf);
4244                         current_ev = iwe_stream_add_point(info, current_ev,
4245                                                           end_buf,
4246                                                           &iwe, buf);
4247                         sprintf(buf, "Path Selection Protocol ID: "
4248                                 "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3],
4249                                                         cfg[4]);
4250                         iwe.u.data.length = strlen(buf);
4251                         current_ev = iwe_stream_add_point(info, current_ev,
4252                                                           end_buf,
4253                                                           &iwe, buf);
4254                         sprintf(buf, "Path Selection Metric ID: "
4255                                 "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7],
4256                                                         cfg[8]);
4257                         iwe.u.data.length = strlen(buf);
4258                         current_ev = iwe_stream_add_point(info, current_ev,
4259                                                           end_buf,
4260                                                           &iwe, buf);
4261                         sprintf(buf, "Congestion Control Mode ID: "
4262                                 "0x%02X%02X%02X%02X", cfg[9], cfg[10],
4263                                                         cfg[11], cfg[12]);
4264                         iwe.u.data.length = strlen(buf);
4265                         current_ev = iwe_stream_add_point(info, current_ev,
4266                                                           end_buf,
4267                                                           &iwe, buf);
4268                         sprintf(buf, "Channel Precedence: "
4269                                 "0x%02X%02X%02X%02X", cfg[13], cfg[14],
4270                                                         cfg[15], cfg[16]);
4271                         iwe.u.data.length = strlen(buf);
4272                         current_ev = iwe_stream_add_point(info, current_ev,
4273                                                           end_buf,
4274                                                           &iwe, buf);
4275                         kfree(buf);
4276                 }
4277         }
4278
4279         return current_ev;
4280 }
4281
4282
4283 int ieee80211_sta_scan_results(struct ieee80211_local *local,
4284                                struct iw_request_info *info,
4285                                char *buf, size_t len)
4286 {
4287         char *current_ev = buf;
4288         char *end_buf = buf + len;
4289         struct ieee80211_sta_bss *bss;
4290
4291         spin_lock_bh(&local->sta_bss_lock);
4292         list_for_each_entry(bss, &local->sta_bss_list, list) {
4293                 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
4294                         spin_unlock_bh(&local->sta_bss_lock);
4295                         return -E2BIG;
4296                 }
4297                 current_ev = ieee80211_sta_scan_result(local, info, bss,
4298                                                        current_ev, end_buf);
4299         }
4300         spin_unlock_bh(&local->sta_bss_lock);
4301         return current_ev - buf;
4302 }
4303
4304
4305 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
4306 {
4307         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
4308
4309         kfree(ifsta->extra_ie);
4310         if (len == 0) {
4311                 ifsta->extra_ie = NULL;
4312                 ifsta->extra_ie_len = 0;
4313                 return 0;
4314         }
4315         ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
4316         if (!ifsta->extra_ie) {
4317                 ifsta->extra_ie_len = 0;
4318                 return -ENOMEM;
4319         }
4320         memcpy(ifsta->extra_ie, ie, len);
4321         ifsta->extra_ie_len = len;
4322         return 0;
4323 }
4324
4325
4326 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
4327                                         struct sk_buff *skb, u8 *bssid,
4328                                         u8 *addr, u64 supp_rates)
4329 {
4330         struct ieee80211_local *local = sdata->local;
4331         struct sta_info *sta;
4332         DECLARE_MAC_BUF(mac);
4333         int band = local->hw.conf.channel->band;
4334
4335         /* TODO: Could consider removing the least recently used entry and
4336          * allow new one to be added. */
4337         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
4338                 if (net_ratelimit()) {
4339                         printk(KERN_DEBUG "%s: No room for a new IBSS STA "
4340                                "entry %s\n", sdata->dev->name, print_mac(mac, addr));
4341                 }
4342                 return NULL;
4343         }
4344
4345         if (compare_ether_addr(bssid, sdata->u.sta.bssid))
4346                 return NULL;
4347
4348 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
4349         printk(KERN_DEBUG "%s: Adding new IBSS station %s (dev=%s)\n",
4350                wiphy_name(local->hw.wiphy), print_mac(mac, addr), sdata->dev->name);
4351 #endif
4352
4353         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
4354         if (!sta)
4355                 return NULL;
4356
4357         set_sta_flags(sta, WLAN_STA_AUTHORIZED);
4358
4359         /* make sure mandatory rates are always added */
4360         sta->supp_rates[band] = supp_rates |
4361                         ieee80211_sta_get_mandatory_rates(local, band);
4362
4363         rate_control_rate_init(sta, local);
4364
4365         if (sta_info_insert(sta))
4366                 return NULL;
4367
4368         return sta;
4369 }
4370
4371
4372 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
4373 {
4374         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
4375
4376         printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
4377                sdata->dev->name, reason);
4378
4379         if (sdata->vif.type != IEEE80211_IF_TYPE_STA &&
4380             sdata->vif.type != IEEE80211_IF_TYPE_IBSS)
4381                 return -EINVAL;
4382
4383         ieee80211_send_deauth(sdata, ifsta, reason);
4384         ieee80211_set_disassoc(sdata, ifsta, 1);
4385         return 0;
4386 }
4387
4388
4389 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
4390 {
4391         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
4392
4393         printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
4394                sdata->dev->name, reason);
4395
4396         if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
4397                 return -EINVAL;
4398
4399         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
4400                 return -1;
4401
4402         ieee80211_send_disassoc(sdata, ifsta, reason);
4403         ieee80211_set_disassoc(sdata, ifsta, 0);
4404         return 0;
4405 }
4406
4407 void ieee80211_notify_mac(struct ieee80211_hw *hw,
4408                           enum ieee80211_notification_types  notif_type)
4409 {
4410         struct ieee80211_local *local = hw_to_local(hw);
4411         struct ieee80211_sub_if_data *sdata;
4412
4413         switch (notif_type) {
4414         case IEEE80211_NOTIFY_RE_ASSOC:
4415                 rcu_read_lock();
4416                 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4417                         if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
4418                                 continue;
4419
4420                         ieee80211_sta_req_auth(sdata, &sdata->u.sta);
4421                 }
4422                 rcu_read_unlock();
4423                 break;
4424         }
4425 }
4426 EXPORT_SYMBOL(ieee80211_notify_mac);