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06d9a1d23252510657790ada62962cfd0702f1eb
[deliverable/linux.git] / net / mac80211 / mlme.c
1 /*
2 * BSS client mode implementation
3 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4 * Copyright 2004, Instant802 Networks, Inc.
5 * Copyright 2005, Devicescape Software, Inc.
6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14 #include <linux/delay.h>
15 #include <linux/if_ether.h>
16 #include <linux/skbuff.h>
17 #include <linux/if_arp.h>
18 #include <linux/etherdevice.h>
19 #include <linux/rtnetlink.h>
20 #include <net/mac80211.h>
21 #include <asm/unaligned.h>
22
23 #include "ieee80211_i.h"
24 #include "rate.h"
25 #include "led.h"
26
27 #define IEEE80211_ASSOC_SCANS_MAX_TRIES 2
28 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
29 #define IEEE80211_AUTH_MAX_TRIES 3
30 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
31 #define IEEE80211_ASSOC_MAX_TRIES 3
32 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
33 #define IEEE80211_PROBE_IDLE_TIME (60 * HZ)
34 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
35
36 /* utils */
37 static int ecw2cw(int ecw)
38 {
39 return (1 << ecw) - 1;
40 }
41
42 static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie)
43 {
44 u8 *end, *pos;
45
46 pos = bss->cbss.information_elements;
47 if (pos == NULL)
48 return NULL;
49 end = pos + bss->cbss.len_information_elements;
50
51 while (pos + 1 < end) {
52 if (pos + 2 + pos[1] > end)
53 break;
54 if (pos[0] == ie)
55 return pos;
56 pos += 2 + pos[1];
57 }
58
59 return NULL;
60 }
61
62 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
63 struct ieee80211_supported_band *sband,
64 u32 *rates)
65 {
66 int i, j, count;
67 *rates = 0;
68 count = 0;
69 for (i = 0; i < bss->supp_rates_len; i++) {
70 int rate = (bss->supp_rates[i] & 0x7F) * 5;
71
72 for (j = 0; j < sband->n_bitrates; j++)
73 if (sband->bitrates[j].bitrate == rate) {
74 *rates |= BIT(j);
75 count++;
76 break;
77 }
78 }
79
80 return count;
81 }
82
83 /*
84 * ieee80211_enable_ht should be called only after the operating band
85 * has been determined as ht configuration depends on the hw's
86 * HT abilities for a specific band.
87 */
88 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
89 struct ieee80211_ht_info *hti,
90 u16 ap_ht_cap_flags)
91 {
92 struct ieee80211_local *local = sdata->local;
93 struct ieee80211_supported_band *sband;
94 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
95 struct ieee80211_bss_ht_conf ht;
96 struct sta_info *sta;
97 u32 changed = 0;
98 bool enable_ht = true, ht_changed;
99 enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
100
101 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
102
103 memset(&ht, 0, sizeof(ht));
104
105 /* HT is not supported */
106 if (!sband->ht_cap.ht_supported)
107 enable_ht = false;
108
109 /* check that channel matches the right operating channel */
110 if (local->hw.conf.channel->center_freq !=
111 ieee80211_channel_to_frequency(hti->control_chan))
112 enable_ht = false;
113
114 if (enable_ht) {
115 channel_type = NL80211_CHAN_HT20;
116
117 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
118 (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
119 (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
120 switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
121 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
122 channel_type = NL80211_CHAN_HT40PLUS;
123 break;
124 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
125 channel_type = NL80211_CHAN_HT40MINUS;
126 break;
127 }
128 }
129 }
130
131 ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
132 channel_type != local->hw.conf.channel_type;
133
134 local->oper_channel_type = channel_type;
135
136 if (ht_changed) {
137 /* channel_type change automatically detected */
138 ieee80211_hw_config(local, 0);
139
140 rcu_read_lock();
141
142 sta = sta_info_get(local, ifmgd->bssid);
143 if (sta)
144 rate_control_rate_update(local, sband, sta,
145 IEEE80211_RC_HT_CHANGED);
146
147 rcu_read_unlock();
148
149 }
150
151 /* disable HT */
152 if (!enable_ht)
153 return 0;
154
155 ht.operation_mode = le16_to_cpu(hti->operation_mode);
156
157 /* if bss configuration changed store the new one */
158 if (memcmp(&sdata->vif.bss_conf.ht, &ht, sizeof(ht))) {
159 changed |= BSS_CHANGED_HT;
160 sdata->vif.bss_conf.ht = ht;
161 }
162
163 return changed;
164 }
165
166 /* frame sending functions */
167
168 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
169 {
170 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
171 struct ieee80211_local *local = sdata->local;
172 struct sk_buff *skb;
173 struct ieee80211_mgmt *mgmt;
174 u8 *pos, *ies, *ht_ie;
175 int i, len, count, rates_len, supp_rates_len;
176 u16 capab;
177 struct ieee80211_bss *bss;
178 int wmm = 0;
179 struct ieee80211_supported_band *sband;
180 u32 rates = 0;
181
182 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
183 sizeof(*mgmt) + 200 + ifmgd->extra_ie_len +
184 ifmgd->ssid_len);
185 if (!skb) {
186 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
187 "frame\n", sdata->dev->name);
188 return;
189 }
190 skb_reserve(skb, local->hw.extra_tx_headroom);
191
192 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
193
194 capab = ifmgd->capab;
195
196 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
197 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
198 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
199 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
200 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
201 }
202
203 bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
204 local->hw.conf.channel->center_freq,
205 ifmgd->ssid, ifmgd->ssid_len);
206 if (bss) {
207 if (bss->cbss.capability & WLAN_CAPABILITY_PRIVACY)
208 capab |= WLAN_CAPABILITY_PRIVACY;
209 if (bss->wmm_used)
210 wmm = 1;
211
212 /* get all rates supported by the device and the AP as
213 * some APs don't like getting a superset of their rates
214 * in the association request (e.g. D-Link DAP 1353 in
215 * b-only mode) */
216 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
217
218 if ((bss->cbss.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
219 (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
220 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
221
222 ieee80211_rx_bss_put(local, bss);
223 } else {
224 rates = ~0;
225 rates_len = sband->n_bitrates;
226 }
227
228 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
229 memset(mgmt, 0, 24);
230 memcpy(mgmt->da, ifmgd->bssid, ETH_ALEN);
231 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
232 memcpy(mgmt->bssid, ifmgd->bssid, ETH_ALEN);
233
234 if (ifmgd->flags & IEEE80211_STA_PREV_BSSID_SET) {
235 skb_put(skb, 10);
236 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
237 IEEE80211_STYPE_REASSOC_REQ);
238 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
239 mgmt->u.reassoc_req.listen_interval =
240 cpu_to_le16(local->hw.conf.listen_interval);
241 memcpy(mgmt->u.reassoc_req.current_ap, ifmgd->prev_bssid,
242 ETH_ALEN);
243 } else {
244 skb_put(skb, 4);
245 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
246 IEEE80211_STYPE_ASSOC_REQ);
247 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
248 mgmt->u.assoc_req.listen_interval =
249 cpu_to_le16(local->hw.conf.listen_interval);
250 }
251
252 /* SSID */
253 ies = pos = skb_put(skb, 2 + ifmgd->ssid_len);
254 *pos++ = WLAN_EID_SSID;
255 *pos++ = ifmgd->ssid_len;
256 memcpy(pos, ifmgd->ssid, ifmgd->ssid_len);
257
258 /* add all rates which were marked to be used above */
259 supp_rates_len = rates_len;
260 if (supp_rates_len > 8)
261 supp_rates_len = 8;
262
263 len = sband->n_bitrates;
264 pos = skb_put(skb, supp_rates_len + 2);
265 *pos++ = WLAN_EID_SUPP_RATES;
266 *pos++ = supp_rates_len;
267
268 count = 0;
269 for (i = 0; i < sband->n_bitrates; i++) {
270 if (BIT(i) & rates) {
271 int rate = sband->bitrates[i].bitrate;
272 *pos++ = (u8) (rate / 5);
273 if (++count == 8)
274 break;
275 }
276 }
277
278 if (rates_len > count) {
279 pos = skb_put(skb, rates_len - count + 2);
280 *pos++ = WLAN_EID_EXT_SUPP_RATES;
281 *pos++ = rates_len - count;
282
283 for (i++; i < sband->n_bitrates; i++) {
284 if (BIT(i) & rates) {
285 int rate = sband->bitrates[i].bitrate;
286 *pos++ = (u8) (rate / 5);
287 }
288 }
289 }
290
291 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
292 /* 1. power capabilities */
293 pos = skb_put(skb, 4);
294 *pos++ = WLAN_EID_PWR_CAPABILITY;
295 *pos++ = 2;
296 *pos++ = 0; /* min tx power */
297 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
298
299 /* 2. supported channels */
300 /* TODO: get this in reg domain format */
301 pos = skb_put(skb, 2 * sband->n_channels + 2);
302 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
303 *pos++ = 2 * sband->n_channels;
304 for (i = 0; i < sband->n_channels; i++) {
305 *pos++ = ieee80211_frequency_to_channel(
306 sband->channels[i].center_freq);
307 *pos++ = 1; /* one channel in the subband*/
308 }
309 }
310
311 if (ifmgd->extra_ie) {
312 pos = skb_put(skb, ifmgd->extra_ie_len);
313 memcpy(pos, ifmgd->extra_ie, ifmgd->extra_ie_len);
314 }
315
316 if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED)) {
317 pos = skb_put(skb, 9);
318 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
319 *pos++ = 7; /* len */
320 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
321 *pos++ = 0x50;
322 *pos++ = 0xf2;
323 *pos++ = 2; /* WME */
324 *pos++ = 0; /* WME info */
325 *pos++ = 1; /* WME ver */
326 *pos++ = 0;
327 }
328
329 /* wmm support is a must to HT */
330 /*
331 * IEEE802.11n does not allow TKIP/WEP as pairwise
332 * ciphers in HT mode. We still associate in non-ht
333 * mode (11a/b/g) if any one of these ciphers is
334 * configured as pairwise.
335 */
336 if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
337 sband->ht_cap.ht_supported &&
338 (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) &&
339 ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
340 (!(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))) {
341 struct ieee80211_ht_info *ht_info =
342 (struct ieee80211_ht_info *)(ht_ie + 2);
343 u16 cap = sband->ht_cap.cap;
344 __le16 tmp;
345 u32 flags = local->hw.conf.channel->flags;
346
347 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
348 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
349 if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
350 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
351 cap &= ~IEEE80211_HT_CAP_SGI_40;
352 }
353 break;
354 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
355 if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
356 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
357 cap &= ~IEEE80211_HT_CAP_SGI_40;
358 }
359 break;
360 }
361
362 tmp = cpu_to_le16(cap);
363 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
364 *pos++ = WLAN_EID_HT_CAPABILITY;
365 *pos++ = sizeof(struct ieee80211_ht_cap);
366 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
367 memcpy(pos, &tmp, sizeof(u16));
368 pos += sizeof(u16);
369 /* TODO: needs a define here for << 2 */
370 *pos++ = sband->ht_cap.ampdu_factor |
371 (sband->ht_cap.ampdu_density << 2);
372 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
373 }
374
375 kfree(ifmgd->assocreq_ies);
376 ifmgd->assocreq_ies_len = (skb->data + skb->len) - ies;
377 ifmgd->assocreq_ies = kmalloc(ifmgd->assocreq_ies_len, GFP_KERNEL);
378 if (ifmgd->assocreq_ies)
379 memcpy(ifmgd->assocreq_ies, ies, ifmgd->assocreq_ies_len);
380
381 ieee80211_tx_skb(sdata, skb, 0);
382 }
383
384
385 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
386 u16 stype, u16 reason)
387 {
388 struct ieee80211_local *local = sdata->local;
389 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
390 struct sk_buff *skb;
391 struct ieee80211_mgmt *mgmt;
392
393 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
394 if (!skb) {
395 printk(KERN_DEBUG "%s: failed to allocate buffer for "
396 "deauth/disassoc frame\n", sdata->dev->name);
397 return;
398 }
399 skb_reserve(skb, local->hw.extra_tx_headroom);
400
401 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
402 memset(mgmt, 0, 24);
403 memcpy(mgmt->da, ifmgd->bssid, ETH_ALEN);
404 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
405 memcpy(mgmt->bssid, ifmgd->bssid, ETH_ALEN);
406 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
407 skb_put(skb, 2);
408 /* u.deauth.reason_code == u.disassoc.reason_code */
409 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
410
411 if (stype == IEEE80211_STYPE_DEAUTH)
412 cfg80211_send_deauth(sdata->dev, (u8 *) mgmt, skb->len);
413 else
414 cfg80211_send_disassoc(sdata->dev, (u8 *) mgmt, skb->len);
415 ieee80211_tx_skb(sdata, skb, ifmgd->flags & IEEE80211_STA_MFP_ENABLED);
416 }
417
418 void ieee80211_send_pspoll(struct ieee80211_local *local,
419 struct ieee80211_sub_if_data *sdata)
420 {
421 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
422 struct ieee80211_pspoll *pspoll;
423 struct sk_buff *skb;
424 u16 fc;
425
426 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
427 if (!skb) {
428 printk(KERN_DEBUG "%s: failed to allocate buffer for "
429 "pspoll frame\n", sdata->dev->name);
430 return;
431 }
432 skb_reserve(skb, local->hw.extra_tx_headroom);
433
434 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
435 memset(pspoll, 0, sizeof(*pspoll));
436 fc = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL | IEEE80211_FCTL_PM;
437 pspoll->frame_control = cpu_to_le16(fc);
438 pspoll->aid = cpu_to_le16(ifmgd->aid);
439
440 /* aid in PS-Poll has its two MSBs each set to 1 */
441 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
442
443 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
444 memcpy(pspoll->ta, sdata->dev->dev_addr, ETH_ALEN);
445
446 ieee80211_tx_skb(sdata, skb, 0);
447 }
448
449 void ieee80211_send_nullfunc(struct ieee80211_local *local,
450 struct ieee80211_sub_if_data *sdata,
451 int powersave)
452 {
453 struct sk_buff *skb;
454 struct ieee80211_hdr *nullfunc;
455 __le16 fc;
456
457 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
458 return;
459
460 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
461 if (!skb) {
462 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
463 "frame\n", sdata->dev->name);
464 return;
465 }
466 skb_reserve(skb, local->hw.extra_tx_headroom);
467
468 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
469 memset(nullfunc, 0, 24);
470 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
471 IEEE80211_FCTL_TODS);
472 if (powersave)
473 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
474 nullfunc->frame_control = fc;
475 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
476 memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
477 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
478
479 ieee80211_tx_skb(sdata, skb, 0);
480 }
481
482 /* powersave */
483 static void ieee80211_enable_ps(struct ieee80211_local *local,
484 struct ieee80211_sub_if_data *sdata)
485 {
486 struct ieee80211_conf *conf = &local->hw.conf;
487
488 if (conf->dynamic_ps_timeout > 0 &&
489 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
490 mod_timer(&local->dynamic_ps_timer, jiffies +
491 msecs_to_jiffies(conf->dynamic_ps_timeout));
492 } else {
493 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
494 ieee80211_send_nullfunc(local, sdata, 1);
495 conf->flags |= IEEE80211_CONF_PS;
496 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
497 }
498 }
499
500 static void ieee80211_change_ps(struct ieee80211_local *local)
501 {
502 struct ieee80211_conf *conf = &local->hw.conf;
503
504 if (local->ps_sdata) {
505 if (!(local->ps_sdata->u.mgd.flags & IEEE80211_STA_ASSOCIATED))
506 return;
507
508 ieee80211_enable_ps(local, local->ps_sdata);
509 } else if (conf->flags & IEEE80211_CONF_PS) {
510 conf->flags &= ~IEEE80211_CONF_PS;
511 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
512 del_timer_sync(&local->dynamic_ps_timer);
513 cancel_work_sync(&local->dynamic_ps_enable_work);
514 }
515 }
516
517 /* need to hold RTNL or interface lock */
518 void ieee80211_recalc_ps(struct ieee80211_local *local)
519 {
520 struct ieee80211_sub_if_data *sdata, *found = NULL;
521 int count = 0;
522
523 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
524 local->ps_sdata = NULL;
525 return;
526 }
527
528 list_for_each_entry(sdata, &local->interfaces, list) {
529 if (!netif_running(sdata->dev))
530 continue;
531 if (sdata->vif.type != NL80211_IFTYPE_STATION)
532 continue;
533 found = sdata;
534 count++;
535 }
536
537 if (count == 1 && found->u.mgd.powersave)
538 local->ps_sdata = found;
539 else
540 local->ps_sdata = NULL;
541
542 ieee80211_change_ps(local);
543 }
544
545 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
546 {
547 struct ieee80211_local *local =
548 container_of(work, struct ieee80211_local,
549 dynamic_ps_disable_work);
550
551 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
552 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
553 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
554 }
555
556 ieee80211_wake_queues_by_reason(&local->hw,
557 IEEE80211_QUEUE_STOP_REASON_PS);
558 }
559
560 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
561 {
562 struct ieee80211_local *local =
563 container_of(work, struct ieee80211_local,
564 dynamic_ps_enable_work);
565 struct ieee80211_sub_if_data *sdata = local->ps_sdata;
566
567 /* can only happen when PS was just disabled anyway */
568 if (!sdata)
569 return;
570
571 if (local->hw.conf.flags & IEEE80211_CONF_PS)
572 return;
573
574 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
575 ieee80211_send_nullfunc(local, sdata, 1);
576
577 local->hw.conf.flags |= IEEE80211_CONF_PS;
578 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
579 }
580
581 void ieee80211_dynamic_ps_timer(unsigned long data)
582 {
583 struct ieee80211_local *local = (void *) data;
584
585 queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
586 }
587
588 /* MLME */
589 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
590 struct ieee80211_if_managed *ifmgd,
591 u8 *wmm_param, size_t wmm_param_len)
592 {
593 struct ieee80211_tx_queue_params params;
594 size_t left;
595 int count;
596 u8 *pos;
597
598 if (!(ifmgd->flags & IEEE80211_STA_WMM_ENABLED))
599 return;
600
601 if (!wmm_param)
602 return;
603
604 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
605 return;
606 count = wmm_param[6] & 0x0f;
607 if (count == ifmgd->wmm_last_param_set)
608 return;
609 ifmgd->wmm_last_param_set = count;
610
611 pos = wmm_param + 8;
612 left = wmm_param_len - 8;
613
614 memset(&params, 0, sizeof(params));
615
616 local->wmm_acm = 0;
617 for (; left >= 4; left -= 4, pos += 4) {
618 int aci = (pos[0] >> 5) & 0x03;
619 int acm = (pos[0] >> 4) & 0x01;
620 int queue;
621
622 switch (aci) {
623 case 1: /* AC_BK */
624 queue = 3;
625 if (acm)
626 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
627 break;
628 case 2: /* AC_VI */
629 queue = 1;
630 if (acm)
631 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
632 break;
633 case 3: /* AC_VO */
634 queue = 0;
635 if (acm)
636 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
637 break;
638 case 0: /* AC_BE */
639 default:
640 queue = 2;
641 if (acm)
642 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
643 break;
644 }
645
646 params.aifs = pos[0] & 0x0f;
647 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
648 params.cw_min = ecw2cw(pos[1] & 0x0f);
649 params.txop = get_unaligned_le16(pos + 2);
650 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
651 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
652 "cWmin=%d cWmax=%d txop=%d\n",
653 local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
654 params.cw_max, params.txop);
655 #endif
656 if (local->ops->conf_tx &&
657 local->ops->conf_tx(local_to_hw(local), queue, &params)) {
658 printk(KERN_DEBUG "%s: failed to set TX queue "
659 "parameters for queue %d\n", local->mdev->name, queue);
660 }
661 }
662 }
663
664 static bool ieee80211_check_tim(struct ieee802_11_elems *elems, u16 aid)
665 {
666 u8 mask;
667 u8 index, indexn1, indexn2;
668 struct ieee80211_tim_ie *tim = (struct ieee80211_tim_ie *) elems->tim;
669
670 if (unlikely(!tim || elems->tim_len < 4))
671 return false;
672
673 aid &= 0x3fff;
674 index = aid / 8;
675 mask = 1 << (aid & 7);
676
677 indexn1 = tim->bitmap_ctrl & 0xfe;
678 indexn2 = elems->tim_len + indexn1 - 4;
679
680 if (index < indexn1 || index > indexn2)
681 return false;
682
683 index -= indexn1;
684
685 return !!(tim->virtual_map[index] & mask);
686 }
687
688 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
689 u16 capab, bool erp_valid, u8 erp)
690 {
691 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
692 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
693 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
694 #endif
695 u32 changed = 0;
696 bool use_protection;
697 bool use_short_preamble;
698 bool use_short_slot;
699
700 if (erp_valid) {
701 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
702 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
703 } else {
704 use_protection = false;
705 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
706 }
707
708 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
709
710 if (use_protection != bss_conf->use_cts_prot) {
711 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
712 if (net_ratelimit()) {
713 printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
714 sdata->dev->name,
715 use_protection ? "enabled" : "disabled",
716 ifmgd->bssid);
717 }
718 #endif
719 bss_conf->use_cts_prot = use_protection;
720 changed |= BSS_CHANGED_ERP_CTS_PROT;
721 }
722
723 if (use_short_preamble != bss_conf->use_short_preamble) {
724 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
725 if (net_ratelimit()) {
726 printk(KERN_DEBUG "%s: switched to %s barker preamble"
727 " (BSSID=%pM)\n",
728 sdata->dev->name,
729 use_short_preamble ? "short" : "long",
730 ifmgd->bssid);
731 }
732 #endif
733 bss_conf->use_short_preamble = use_short_preamble;
734 changed |= BSS_CHANGED_ERP_PREAMBLE;
735 }
736
737 if (use_short_slot != bss_conf->use_short_slot) {
738 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
739 if (net_ratelimit()) {
740 printk(KERN_DEBUG "%s: switched to %s slot time"
741 " (BSSID=%pM)\n",
742 sdata->dev->name,
743 use_short_slot ? "short" : "long",
744 ifmgd->bssid);
745 }
746 #endif
747 bss_conf->use_short_slot = use_short_slot;
748 changed |= BSS_CHANGED_ERP_SLOT;
749 }
750
751 return changed;
752 }
753
754 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata)
755 {
756 union iwreq_data wrqu;
757
758 memset(&wrqu, 0, sizeof(wrqu));
759 if (sdata->u.mgd.flags & IEEE80211_STA_ASSOCIATED)
760 memcpy(wrqu.ap_addr.sa_data, sdata->u.mgd.bssid, ETH_ALEN);
761 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
762 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
763 }
764
765 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata)
766 {
767 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
768 char *buf;
769 size_t len;
770 int i;
771 union iwreq_data wrqu;
772
773 if (!ifmgd->assocreq_ies && !ifmgd->assocresp_ies)
774 return;
775
776 buf = kmalloc(50 + 2 * (ifmgd->assocreq_ies_len +
777 ifmgd->assocresp_ies_len), GFP_KERNEL);
778 if (!buf)
779 return;
780
781 len = sprintf(buf, "ASSOCINFO(");
782 if (ifmgd->assocreq_ies) {
783 len += sprintf(buf + len, "ReqIEs=");
784 for (i = 0; i < ifmgd->assocreq_ies_len; i++) {
785 len += sprintf(buf + len, "%02x",
786 ifmgd->assocreq_ies[i]);
787 }
788 }
789 if (ifmgd->assocresp_ies) {
790 if (ifmgd->assocreq_ies)
791 len += sprintf(buf + len, " ");
792 len += sprintf(buf + len, "RespIEs=");
793 for (i = 0; i < ifmgd->assocresp_ies_len; i++) {
794 len += sprintf(buf + len, "%02x",
795 ifmgd->assocresp_ies[i]);
796 }
797 }
798 len += sprintf(buf + len, ")");
799
800 if (len > IW_CUSTOM_MAX) {
801 len = sprintf(buf, "ASSOCRESPIE=");
802 for (i = 0; i < ifmgd->assocresp_ies_len; i++) {
803 len += sprintf(buf + len, "%02x",
804 ifmgd->assocresp_ies[i]);
805 }
806 }
807
808 if (len <= IW_CUSTOM_MAX) {
809 memset(&wrqu, 0, sizeof(wrqu));
810 wrqu.data.length = len;
811 wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
812 }
813
814 kfree(buf);
815 }
816
817
818 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
819 u32 bss_info_changed)
820 {
821 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
822 struct ieee80211_local *local = sdata->local;
823 struct ieee80211_conf *conf = &local_to_hw(local)->conf;
824
825 struct ieee80211_bss *bss;
826
827 bss_info_changed |= BSS_CHANGED_ASSOC;
828 ifmgd->flags |= IEEE80211_STA_ASSOCIATED;
829
830 bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
831 conf->channel->center_freq,
832 ifmgd->ssid, ifmgd->ssid_len);
833 if (bss) {
834 /* set timing information */
835 sdata->vif.bss_conf.beacon_int = bss->cbss.beacon_interval;
836 sdata->vif.bss_conf.timestamp = bss->cbss.tsf;
837 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
838
839 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
840 bss->cbss.capability, bss->has_erp_value, bss->erp_value);
841
842 cfg80211_hold_bss(&bss->cbss);
843
844 ieee80211_rx_bss_put(local, bss);
845 }
846
847 ifmgd->flags |= IEEE80211_STA_PREV_BSSID_SET;
848 memcpy(ifmgd->prev_bssid, sdata->u.mgd.bssid, ETH_ALEN);
849 ieee80211_sta_send_associnfo(sdata);
850
851 ifmgd->last_probe = jiffies;
852 ieee80211_led_assoc(local, 1);
853
854 sdata->vif.bss_conf.assoc = 1;
855 /*
856 * For now just always ask the driver to update the basic rateset
857 * when we have associated, we aren't checking whether it actually
858 * changed or not.
859 */
860 bss_info_changed |= BSS_CHANGED_BASIC_RATES;
861 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
862
863 /* will be same as sdata */
864 if (local->ps_sdata)
865 ieee80211_enable_ps(local, sdata);
866
867 netif_tx_start_all_queues(sdata->dev);
868 netif_carrier_on(sdata->dev);
869
870 ieee80211_sta_send_apinfo(sdata);
871 }
872
873 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata)
874 {
875 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
876 struct ieee80211_local *local = sdata->local;
877
878 ifmgd->direct_probe_tries++;
879 if (ifmgd->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
880 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
881 sdata->dev->name, ifmgd->bssid);
882 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
883 ieee80211_sta_send_apinfo(sdata);
884
885 /*
886 * Most likely AP is not in the range so remove the
887 * bss information associated to the AP
888 */
889 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
890 sdata->local->hw.conf.channel->center_freq,
891 ifmgd->ssid, ifmgd->ssid_len);
892
893 /*
894 * We might have a pending scan which had no chance to run yet
895 * due to state == IEEE80211_STA_MLME_DIRECT_PROBE.
896 * Hence, queue the STAs work again
897 */
898 queue_work(local->hw.workqueue, &ifmgd->work);
899 return;
900 }
901
902 printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
903 sdata->dev->name, ifmgd->bssid,
904 ifmgd->direct_probe_tries);
905
906 ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
907
908 set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifmgd->request);
909
910 /* Direct probe is sent to broadcast address as some APs
911 * will not answer to direct packet in unassociated state.
912 */
913 ieee80211_send_probe_req(sdata, NULL,
914 ifmgd->ssid, ifmgd->ssid_len, NULL, 0);
915
916 mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
917 }
918
919
920 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata)
921 {
922 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
923 struct ieee80211_local *local = sdata->local;
924 u8 *ies;
925 size_t ies_len;
926
927 ifmgd->auth_tries++;
928 if (ifmgd->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
929 printk(KERN_DEBUG "%s: authentication with AP %pM"
930 " timed out\n",
931 sdata->dev->name, ifmgd->bssid);
932 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
933 ieee80211_sta_send_apinfo(sdata);
934 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
935 sdata->local->hw.conf.channel->center_freq,
936 ifmgd->ssid, ifmgd->ssid_len);
937
938 /*
939 * We might have a pending scan which had no chance to run yet
940 * due to state == IEEE80211_STA_MLME_AUTHENTICATE.
941 * Hence, queue the STAs work again
942 */
943 queue_work(local->hw.workqueue, &ifmgd->work);
944 return;
945 }
946
947 ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
948 printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
949 sdata->dev->name, ifmgd->bssid);
950
951 if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
952 ies = ifmgd->sme_auth_ie;
953 ies_len = ifmgd->sme_auth_ie_len;
954 } else {
955 ies = NULL;
956 ies_len = 0;
957 }
958 ieee80211_send_auth(sdata, 1, ifmgd->auth_alg, ies, ies_len,
959 ifmgd->bssid, 0);
960 ifmgd->auth_transaction = 2;
961
962 mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
963 }
964
965 /*
966 * The disassoc 'reason' argument can be either our own reason
967 * if self disconnected or a reason code from the AP.
968 */
969 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
970 bool deauth, bool self_disconnected,
971 u16 reason)
972 {
973 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
974 struct ieee80211_local *local = sdata->local;
975 struct ieee80211_conf *conf = &local_to_hw(local)->conf;
976 struct ieee80211_bss *bss;
977 struct sta_info *sta;
978 u32 changed = 0, config_changed = 0;
979
980 rcu_read_lock();
981
982 sta = sta_info_get(local, ifmgd->bssid);
983 if (!sta) {
984 rcu_read_unlock();
985 return;
986 }
987
988 if (deauth) {
989 ifmgd->direct_probe_tries = 0;
990 ifmgd->auth_tries = 0;
991 }
992 ifmgd->assoc_scan_tries = 0;
993 ifmgd->assoc_tries = 0;
994
995 netif_tx_stop_all_queues(sdata->dev);
996 netif_carrier_off(sdata->dev);
997
998 ieee80211_sta_tear_down_BA_sessions(sta);
999
1000 bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
1001 conf->channel->center_freq,
1002 ifmgd->ssid, ifmgd->ssid_len);
1003
1004 if (bss) {
1005 cfg80211_unhold_bss(&bss->cbss);
1006 ieee80211_rx_bss_put(local, bss);
1007 }
1008
1009 if (self_disconnected) {
1010 if (deauth)
1011 ieee80211_send_deauth_disassoc(sdata,
1012 IEEE80211_STYPE_DEAUTH, reason);
1013 else
1014 ieee80211_send_deauth_disassoc(sdata,
1015 IEEE80211_STYPE_DISASSOC, reason);
1016 }
1017
1018 ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
1019 changed |= ieee80211_reset_erp_info(sdata);
1020
1021 ieee80211_led_assoc(local, 0);
1022 changed |= BSS_CHANGED_ASSOC;
1023 sdata->vif.bss_conf.assoc = false;
1024
1025 ieee80211_sta_send_apinfo(sdata);
1026
1027 if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT) {
1028 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1029 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
1030 sdata->local->hw.conf.channel->center_freq,
1031 ifmgd->ssid, ifmgd->ssid_len);
1032 }
1033
1034 rcu_read_unlock();
1035
1036 /* channel(_type) changes are handled by ieee80211_hw_config */
1037 local->oper_channel_type = NL80211_CHAN_NO_HT;
1038
1039 local->power_constr_level = 0;
1040
1041 del_timer_sync(&local->dynamic_ps_timer);
1042 cancel_work_sync(&local->dynamic_ps_enable_work);
1043
1044 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1045 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1046 config_changed |= IEEE80211_CONF_CHANGE_PS;
1047 }
1048
1049 ieee80211_hw_config(local, config_changed);
1050 ieee80211_bss_info_change_notify(sdata, changed);
1051
1052 rcu_read_lock();
1053
1054 sta = sta_info_get(local, ifmgd->bssid);
1055 if (!sta) {
1056 rcu_read_unlock();
1057 return;
1058 }
1059
1060 sta_info_unlink(&sta);
1061
1062 rcu_read_unlock();
1063
1064 sta_info_destroy(sta);
1065 }
1066
1067 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
1068 {
1069 if (!sdata || !sdata->default_key ||
1070 sdata->default_key->conf.alg != ALG_WEP)
1071 return 0;
1072 return 1;
1073 }
1074
1075 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata)
1076 {
1077 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1078 struct ieee80211_local *local = sdata->local;
1079 struct ieee80211_bss *bss;
1080 int bss_privacy;
1081 int wep_privacy;
1082 int privacy_invoked;
1083
1084 if (!ifmgd || (ifmgd->flags & IEEE80211_STA_EXT_SME))
1085 return 0;
1086
1087 bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
1088 local->hw.conf.channel->center_freq,
1089 ifmgd->ssid, ifmgd->ssid_len);
1090 if (!bss)
1091 return 0;
1092
1093 bss_privacy = !!(bss->cbss.capability & WLAN_CAPABILITY_PRIVACY);
1094 wep_privacy = !!ieee80211_sta_wep_configured(sdata);
1095 privacy_invoked = !!(ifmgd->flags & IEEE80211_STA_PRIVACY_INVOKED);
1096
1097 ieee80211_rx_bss_put(local, bss);
1098
1099 if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
1100 return 0;
1101
1102 return 1;
1103 }
1104
1105 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata)
1106 {
1107 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1108 struct ieee80211_local *local = sdata->local;
1109
1110 ifmgd->assoc_tries++;
1111 if (ifmgd->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
1112 printk(KERN_DEBUG "%s: association with AP %pM"
1113 " timed out\n",
1114 sdata->dev->name, ifmgd->bssid);
1115 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1116 ieee80211_sta_send_apinfo(sdata);
1117 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
1118 sdata->local->hw.conf.channel->center_freq,
1119 ifmgd->ssid, ifmgd->ssid_len);
1120 /*
1121 * We might have a pending scan which had no chance to run yet
1122 * due to state == IEEE80211_STA_MLME_ASSOCIATE.
1123 * Hence, queue the STAs work again
1124 */
1125 queue_work(local->hw.workqueue, &ifmgd->work);
1126 return;
1127 }
1128
1129 ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE;
1130 printk(KERN_DEBUG "%s: associate with AP %pM\n",
1131 sdata->dev->name, ifmgd->bssid);
1132 if (ieee80211_privacy_mismatch(sdata)) {
1133 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
1134 "mixed-cell disabled - abort association\n", sdata->dev->name);
1135 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1136 return;
1137 }
1138
1139 ieee80211_send_assoc(sdata);
1140
1141 mod_timer(&ifmgd->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
1142 }
1143
1144 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1145 struct ieee80211_hdr *hdr)
1146 {
1147 /*
1148 * We can postpone the mgd.timer whenever receiving unicast frames
1149 * from AP because we know that the connection is working both ways
1150 * at that time. But multicast frames (and hence also beacons) must
1151 * be ignored here, because we need to trigger the timer during
1152 * data idle periods for sending the periodical probe request to
1153 * the AP.
1154 */
1155 if (!is_multicast_ether_addr(hdr->addr1))
1156 mod_timer(&sdata->u.mgd.timer,
1157 jiffies + IEEE80211_MONITORING_INTERVAL);
1158 }
1159
1160 void ieee80211_beacon_loss_work(struct work_struct *work)
1161 {
1162 struct ieee80211_sub_if_data *sdata =
1163 container_of(work, struct ieee80211_sub_if_data,
1164 u.mgd.beacon_loss_work);
1165 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1166
1167 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1168 if (net_ratelimit()) {
1169 printk(KERN_DEBUG "%s: driver reports beacon loss from AP %pM "
1170 "- sending probe request\n", sdata->dev->name,
1171 sdata->u.mgd.bssid);
1172 }
1173 #endif
1174
1175 ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1176 ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1177 ifmgd->ssid_len, NULL, 0);
1178
1179 mod_timer(&ifmgd->timer, jiffies + IEEE80211_MONITORING_INTERVAL);
1180 }
1181
1182 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1183 {
1184 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1185
1186 queue_work(sdata->local->hw.workqueue,
1187 &sdata->u.mgd.beacon_loss_work);
1188 }
1189 EXPORT_SYMBOL(ieee80211_beacon_loss);
1190
1191 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata)
1192 {
1193 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1194 struct ieee80211_local *local = sdata->local;
1195 struct sta_info *sta;
1196 bool disassoc = false;
1197
1198 /* TODO: start monitoring current AP signal quality and number of
1199 * missed beacons. Scan other channels every now and then and search
1200 * for better APs. */
1201 /* TODO: remove expired BSSes */
1202
1203 ifmgd->state = IEEE80211_STA_MLME_ASSOCIATED;
1204
1205 rcu_read_lock();
1206
1207 sta = sta_info_get(local, ifmgd->bssid);
1208 if (!sta) {
1209 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
1210 sdata->dev->name, ifmgd->bssid);
1211 disassoc = true;
1212 goto unlock;
1213 }
1214
1215 if ((ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) &&
1216 time_after(jiffies, sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
1217 printk(KERN_DEBUG "%s: no probe response from AP %pM "
1218 "- disassociating\n",
1219 sdata->dev->name, ifmgd->bssid);
1220 disassoc = true;
1221 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1222 goto unlock;
1223 }
1224
1225 /*
1226 * Beacon filtering is only enabled with power save and then the
1227 * stack should not check for beacon loss.
1228 */
1229 if (!((local->hw.flags & IEEE80211_HW_BEACON_FILTER) &&
1230 (local->hw.conf.flags & IEEE80211_CONF_PS)) &&
1231 time_after(jiffies,
1232 ifmgd->last_beacon + IEEE80211_MONITORING_INTERVAL)) {
1233 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1234 if (net_ratelimit()) {
1235 printk(KERN_DEBUG "%s: beacon loss from AP %pM "
1236 "- sending probe request\n",
1237 sdata->dev->name, ifmgd->bssid);
1238 }
1239 #endif
1240 ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1241 ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1242 ifmgd->ssid_len, NULL, 0);
1243 goto unlock;
1244
1245 }
1246
1247 if (time_after(jiffies, sta->last_rx + IEEE80211_PROBE_IDLE_TIME)) {
1248 ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1249 ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1250 ifmgd->ssid_len, NULL, 0);
1251 }
1252
1253 unlock:
1254 rcu_read_unlock();
1255
1256 if (disassoc)
1257 ieee80211_set_disassoc(sdata, true, true,
1258 WLAN_REASON_PREV_AUTH_NOT_VALID);
1259 else
1260 mod_timer(&ifmgd->timer, jiffies +
1261 IEEE80211_MONITORING_INTERVAL);
1262 }
1263
1264
1265 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata)
1266 {
1267 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1268
1269 printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1270 ifmgd->flags |= IEEE80211_STA_AUTHENTICATED;
1271 if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
1272 /* Wait for SME to request association */
1273 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1274 } else
1275 ieee80211_associate(sdata);
1276 }
1277
1278
1279 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1280 struct ieee80211_mgmt *mgmt,
1281 size_t len)
1282 {
1283 u8 *pos;
1284 struct ieee802_11_elems elems;
1285
1286 pos = mgmt->u.auth.variable;
1287 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1288 if (!elems.challenge)
1289 return;
1290 ieee80211_send_auth(sdata, 3, sdata->u.mgd.auth_alg,
1291 elems.challenge - 2, elems.challenge_len + 2,
1292 sdata->u.mgd.bssid, 1);
1293 sdata->u.mgd.auth_transaction = 4;
1294 }
1295
1296 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1297 struct ieee80211_mgmt *mgmt,
1298 size_t len)
1299 {
1300 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1301 u16 auth_alg, auth_transaction, status_code;
1302
1303 if (ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE)
1304 return;
1305
1306 if (len < 24 + 6)
1307 return;
1308
1309 if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
1310 return;
1311
1312 if (memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
1313 return;
1314
1315 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1316 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1317 status_code = le16_to_cpu(mgmt->u.auth.status_code);
1318
1319 if (auth_alg != ifmgd->auth_alg ||
1320 auth_transaction != ifmgd->auth_transaction)
1321 return;
1322
1323 if (status_code != WLAN_STATUS_SUCCESS) {
1324 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1325 u8 algs[3];
1326 const int num_algs = ARRAY_SIZE(algs);
1327 int i, pos;
1328 algs[0] = algs[1] = algs[2] = 0xff;
1329 if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1330 algs[0] = WLAN_AUTH_OPEN;
1331 if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1332 algs[1] = WLAN_AUTH_SHARED_KEY;
1333 if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1334 algs[2] = WLAN_AUTH_LEAP;
1335 if (ifmgd->auth_alg == WLAN_AUTH_OPEN)
1336 pos = 0;
1337 else if (ifmgd->auth_alg == WLAN_AUTH_SHARED_KEY)
1338 pos = 1;
1339 else
1340 pos = 2;
1341 for (i = 0; i < num_algs; i++) {
1342 pos++;
1343 if (pos >= num_algs)
1344 pos = 0;
1345 if (algs[pos] == ifmgd->auth_alg ||
1346 algs[pos] == 0xff)
1347 continue;
1348 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1349 !ieee80211_sta_wep_configured(sdata))
1350 continue;
1351 ifmgd->auth_alg = algs[pos];
1352 break;
1353 }
1354 }
1355 return;
1356 }
1357
1358 switch (ifmgd->auth_alg) {
1359 case WLAN_AUTH_OPEN:
1360 case WLAN_AUTH_LEAP:
1361 case WLAN_AUTH_FT:
1362 ieee80211_auth_completed(sdata);
1363 cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, len);
1364 break;
1365 case WLAN_AUTH_SHARED_KEY:
1366 if (ifmgd->auth_transaction == 4) {
1367 ieee80211_auth_completed(sdata);
1368 cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, len);
1369 } else
1370 ieee80211_auth_challenge(sdata, mgmt, len);
1371 break;
1372 }
1373 }
1374
1375
1376 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1377 struct ieee80211_mgmt *mgmt,
1378 size_t len)
1379 {
1380 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1381 u16 reason_code;
1382
1383 if (len < 24 + 2)
1384 return;
1385
1386 if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
1387 return;
1388
1389 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1390
1391 if (ifmgd->flags & IEEE80211_STA_AUTHENTICATED)
1392 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
1393 sdata->dev->name, reason_code);
1394
1395 if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
1396 (ifmgd->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1397 ifmgd->state == IEEE80211_STA_MLME_ASSOCIATE ||
1398 ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)) {
1399 ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1400 mod_timer(&ifmgd->timer, jiffies +
1401 IEEE80211_RETRY_AUTH_INTERVAL);
1402 }
1403
1404 ieee80211_set_disassoc(sdata, true, false, 0);
1405 ifmgd->flags &= ~IEEE80211_STA_AUTHENTICATED;
1406 cfg80211_send_deauth(sdata->dev, (u8 *) mgmt, len);
1407 }
1408
1409
1410 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1411 struct ieee80211_mgmt *mgmt,
1412 size_t len)
1413 {
1414 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1415 u16 reason_code;
1416
1417 if (len < 24 + 2)
1418 return;
1419
1420 if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
1421 return;
1422
1423 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1424
1425 if (ifmgd->flags & IEEE80211_STA_ASSOCIATED)
1426 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1427 sdata->dev->name, reason_code);
1428
1429 if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
1430 ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED) {
1431 ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE;
1432 mod_timer(&ifmgd->timer, jiffies +
1433 IEEE80211_RETRY_AUTH_INTERVAL);
1434 }
1435
1436 ieee80211_set_disassoc(sdata, false, false, reason_code);
1437 cfg80211_send_disassoc(sdata->dev, (u8 *) mgmt, len);
1438 }
1439
1440
1441 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1442 struct ieee80211_mgmt *mgmt,
1443 size_t len,
1444 int reassoc)
1445 {
1446 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1447 struct ieee80211_local *local = sdata->local;
1448 struct ieee80211_supported_band *sband;
1449 struct sta_info *sta;
1450 u32 rates, basic_rates;
1451 u16 capab_info, status_code, aid;
1452 struct ieee802_11_elems elems;
1453 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1454 u8 *pos;
1455 u32 changed = 0;
1456 int i, j;
1457 bool have_higher_than_11mbit = false, newsta = false;
1458 u16 ap_ht_cap_flags;
1459
1460 /* AssocResp and ReassocResp have identical structure, so process both
1461 * of them in this function. */
1462
1463 if (ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE)
1464 return;
1465
1466 if (len < 24 + 6)
1467 return;
1468
1469 if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
1470 return;
1471
1472 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1473 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1474 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1475
1476 printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1477 "status=%d aid=%d)\n",
1478 sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1479 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1480
1481 pos = mgmt->u.assoc_resp.variable;
1482 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1483
1484 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1485 elems.timeout_int && elems.timeout_int_len == 5 &&
1486 elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1487 u32 tu, ms;
1488 tu = get_unaligned_le32(elems.timeout_int + 1);
1489 ms = tu * 1024 / 1000;
1490 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1491 "comeback duration %u TU (%u ms)\n",
1492 sdata->dev->name, tu, ms);
1493 if (ms > IEEE80211_ASSOC_TIMEOUT)
1494 mod_timer(&ifmgd->timer,
1495 jiffies + msecs_to_jiffies(ms));
1496 return;
1497 }
1498
1499 if (status_code != WLAN_STATUS_SUCCESS) {
1500 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1501 sdata->dev->name, status_code);
1502 /* if this was a reassociation, ensure we try a "full"
1503 * association next time. This works around some broken APs
1504 * which do not correctly reject reassociation requests. */
1505 ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1506 cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, len);
1507 if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
1508 /* Wait for SME to decide what to do next */
1509 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1510 }
1511 return;
1512 }
1513
1514 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1515 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1516 "set\n", sdata->dev->name, aid);
1517 aid &= ~(BIT(15) | BIT(14));
1518
1519 if (!elems.supp_rates) {
1520 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1521 sdata->dev->name);
1522 return;
1523 }
1524
1525 printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1526 ifmgd->aid = aid;
1527 ifmgd->ap_capab = capab_info;
1528
1529 kfree(ifmgd->assocresp_ies);
1530 ifmgd->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1531 ifmgd->assocresp_ies = kmalloc(ifmgd->assocresp_ies_len, GFP_KERNEL);
1532 if (ifmgd->assocresp_ies)
1533 memcpy(ifmgd->assocresp_ies, pos, ifmgd->assocresp_ies_len);
1534
1535 rcu_read_lock();
1536
1537 /* Add STA entry for the AP */
1538 sta = sta_info_get(local, ifmgd->bssid);
1539 if (!sta) {
1540 newsta = true;
1541
1542 sta = sta_info_alloc(sdata, ifmgd->bssid, GFP_ATOMIC);
1543 if (!sta) {
1544 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1545 " the AP\n", sdata->dev->name);
1546 rcu_read_unlock();
1547 return;
1548 }
1549
1550 /* update new sta with its last rx activity */
1551 sta->last_rx = jiffies;
1552 }
1553
1554 /*
1555 * FIXME: Do we really need to update the sta_info's information here?
1556 * We already know about the AP (we found it in our list) so it
1557 * should already be filled with the right info, no?
1558 * As is stands, all this is racy because typically we assume
1559 * the information that is filled in here (except flags) doesn't
1560 * change while a STA structure is alive. As such, it should move
1561 * to between the sta_info_alloc() and sta_info_insert() above.
1562 */
1563
1564 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1565 WLAN_STA_AUTHORIZED);
1566
1567 rates = 0;
1568 basic_rates = 0;
1569 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1570
1571 for (i = 0; i < elems.supp_rates_len; i++) {
1572 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1573 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1574
1575 if (rate > 110)
1576 have_higher_than_11mbit = true;
1577
1578 for (j = 0; j < sband->n_bitrates; j++) {
1579 if (sband->bitrates[j].bitrate == rate) {
1580 rates |= BIT(j);
1581 if (is_basic)
1582 basic_rates |= BIT(j);
1583 break;
1584 }
1585 }
1586 }
1587
1588 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1589 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1590 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1591
1592 if (rate > 110)
1593 have_higher_than_11mbit = true;
1594
1595 for (j = 0; j < sband->n_bitrates; j++) {
1596 if (sband->bitrates[j].bitrate == rate) {
1597 rates |= BIT(j);
1598 if (is_basic)
1599 basic_rates |= BIT(j);
1600 break;
1601 }
1602 }
1603 }
1604
1605 sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1606 sdata->vif.bss_conf.basic_rates = basic_rates;
1607
1608 /* cf. IEEE 802.11 9.2.12 */
1609 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1610 have_higher_than_11mbit)
1611 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1612 else
1613 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1614
1615 /* If TKIP/WEP is used, no need to parse AP's HT capabilities */
1616 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))
1617 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1618 elems.ht_cap_elem, &sta->sta.ht_cap);
1619
1620 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1621
1622 rate_control_rate_init(sta);
1623
1624 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1625 set_sta_flags(sta, WLAN_STA_MFP);
1626
1627 if (elems.wmm_param)
1628 set_sta_flags(sta, WLAN_STA_WME);
1629
1630 if (newsta) {
1631 int err = sta_info_insert(sta);
1632 if (err) {
1633 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1634 " the AP (error %d)\n", sdata->dev->name, err);
1635 rcu_read_unlock();
1636 return;
1637 }
1638 }
1639
1640 rcu_read_unlock();
1641
1642 if (elems.wmm_param)
1643 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1644 elems.wmm_param_len);
1645
1646 if (elems.ht_info_elem && elems.wmm_param &&
1647 (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
1648 !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))
1649 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1650 ap_ht_cap_flags);
1651
1652 /* set AID and assoc capability,
1653 * ieee80211_set_associated() will tell the driver */
1654 bss_conf->aid = aid;
1655 bss_conf->assoc_capability = capab_info;
1656 ieee80211_set_associated(sdata, changed);
1657
1658 /*
1659 * initialise the time of last beacon to be the association time,
1660 * otherwise beacon loss check will trigger immediately
1661 */
1662 ifmgd->last_beacon = jiffies;
1663
1664 ieee80211_associated(sdata);
1665 cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, len);
1666 }
1667
1668
1669 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1670 struct ieee80211_mgmt *mgmt,
1671 size_t len,
1672 struct ieee80211_rx_status *rx_status,
1673 struct ieee802_11_elems *elems,
1674 bool beacon)
1675 {
1676 struct ieee80211_local *local = sdata->local;
1677 int freq;
1678 struct ieee80211_bss *bss;
1679 struct ieee80211_channel *channel;
1680
1681 if (elems->ds_params && elems->ds_params_len == 1)
1682 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1683 else
1684 freq = rx_status->freq;
1685
1686 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1687
1688 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1689 return;
1690
1691 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1692 channel, beacon);
1693 if (!bss)
1694 return;
1695
1696 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1697 (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN) == 0)) {
1698 struct ieee80211_channel_sw_ie *sw_elem =
1699 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1700 ieee80211_process_chanswitch(sdata, sw_elem, bss);
1701 }
1702
1703 ieee80211_rx_bss_put(local, bss);
1704 }
1705
1706
1707 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1708 struct ieee80211_mgmt *mgmt,
1709 size_t len,
1710 struct ieee80211_rx_status *rx_status)
1711 {
1712 struct ieee80211_if_managed *ifmgd;
1713 size_t baselen;
1714 struct ieee802_11_elems elems;
1715
1716 ifmgd = &sdata->u.mgd;
1717
1718 if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1719 return; /* ignore ProbeResp to foreign address */
1720
1721 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1722 if (baselen > len)
1723 return;
1724
1725 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1726 &elems);
1727
1728 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1729
1730 /* direct probe may be part of the association flow */
1731 if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1732 &ifmgd->request)) {
1733 printk(KERN_DEBUG "%s direct probe responded\n",
1734 sdata->dev->name);
1735 ieee80211_authenticate(sdata);
1736 }
1737
1738 if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL)
1739 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1740 }
1741
1742 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1743 struct ieee80211_mgmt *mgmt,
1744 size_t len,
1745 struct ieee80211_rx_status *rx_status)
1746 {
1747 struct ieee80211_if_managed *ifmgd;
1748 size_t baselen;
1749 struct ieee802_11_elems elems;
1750 struct ieee80211_local *local = sdata->local;
1751 u32 changed = 0;
1752 bool erp_valid, directed_tim;
1753 u8 erp_value = 0;
1754
1755 /* Process beacon from the current BSS */
1756 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1757 if (baselen > len)
1758 return;
1759
1760 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1761
1762 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1763
1764 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1765 return;
1766
1767 ifmgd = &sdata->u.mgd;
1768
1769 if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED) ||
1770 memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
1771 return;
1772
1773 if (rx_status->freq != local->hw.conf.channel->center_freq)
1774 return;
1775
1776 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1777 elems.wmm_param_len);
1778
1779 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1780 directed_tim = ieee80211_check_tim(&elems, ifmgd->aid);
1781
1782 if (directed_tim) {
1783 if (local->hw.conf.dynamic_ps_timeout > 0) {
1784 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1785 ieee80211_hw_config(local,
1786 IEEE80211_CONF_CHANGE_PS);
1787 ieee80211_send_nullfunc(local, sdata, 0);
1788 } else {
1789 local->pspolling = true;
1790
1791 /*
1792 * Here is assumed that the driver will be
1793 * able to send ps-poll frame and receive a
1794 * response even though power save mode is
1795 * enabled, but some drivers might require
1796 * to disable power save here. This needs
1797 * to be investigated.
1798 */
1799 ieee80211_send_pspoll(local, sdata);
1800 }
1801 }
1802 }
1803
1804 if (elems.erp_info && elems.erp_info_len >= 1) {
1805 erp_valid = true;
1806 erp_value = elems.erp_info[0];
1807 } else {
1808 erp_valid = false;
1809 }
1810 changed |= ieee80211_handle_bss_capability(sdata,
1811 le16_to_cpu(mgmt->u.beacon.capab_info),
1812 erp_valid, erp_value);
1813
1814
1815 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1816 !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED)) {
1817 struct sta_info *sta;
1818 struct ieee80211_supported_band *sband;
1819 u16 ap_ht_cap_flags;
1820
1821 rcu_read_lock();
1822
1823 sta = sta_info_get(local, ifmgd->bssid);
1824 if (!sta) {
1825 rcu_read_unlock();
1826 return;
1827 }
1828
1829 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1830
1831 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1832 elems.ht_cap_elem, &sta->sta.ht_cap);
1833
1834 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1835
1836 rcu_read_unlock();
1837
1838 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1839 ap_ht_cap_flags);
1840 }
1841
1842 if (elems.country_elem) {
1843 /* Note we are only reviewing this on beacons
1844 * for the BSSID we are associated to */
1845 regulatory_hint_11d(local->hw.wiphy,
1846 elems.country_elem, elems.country_elem_len);
1847
1848 /* TODO: IBSS also needs this */
1849 if (elems.pwr_constr_elem)
1850 ieee80211_handle_pwr_constr(sdata,
1851 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1852 elems.pwr_constr_elem,
1853 elems.pwr_constr_elem_len);
1854 }
1855
1856 ieee80211_bss_info_change_notify(sdata, changed);
1857 }
1858
1859 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1860 struct sk_buff *skb,
1861 struct ieee80211_rx_status *rx_status)
1862 {
1863 struct ieee80211_local *local = sdata->local;
1864 struct ieee80211_mgmt *mgmt;
1865 u16 fc;
1866
1867 if (skb->len < 24)
1868 return RX_DROP_MONITOR;
1869
1870 mgmt = (struct ieee80211_mgmt *) skb->data;
1871 fc = le16_to_cpu(mgmt->frame_control);
1872
1873 switch (fc & IEEE80211_FCTL_STYPE) {
1874 case IEEE80211_STYPE_PROBE_REQ:
1875 case IEEE80211_STYPE_PROBE_RESP:
1876 case IEEE80211_STYPE_BEACON:
1877 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1878 case IEEE80211_STYPE_AUTH:
1879 case IEEE80211_STYPE_ASSOC_RESP:
1880 case IEEE80211_STYPE_REASSOC_RESP:
1881 case IEEE80211_STYPE_DEAUTH:
1882 case IEEE80211_STYPE_DISASSOC:
1883 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1884 queue_work(local->hw.workqueue, &sdata->u.mgd.work);
1885 return RX_QUEUED;
1886 }
1887
1888 return RX_DROP_MONITOR;
1889 }
1890
1891 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1892 struct sk_buff *skb)
1893 {
1894 struct ieee80211_rx_status *rx_status;
1895 struct ieee80211_mgmt *mgmt;
1896 u16 fc;
1897
1898 rx_status = (struct ieee80211_rx_status *) skb->cb;
1899 mgmt = (struct ieee80211_mgmt *) skb->data;
1900 fc = le16_to_cpu(mgmt->frame_control);
1901
1902 switch (fc & IEEE80211_FCTL_STYPE) {
1903 case IEEE80211_STYPE_PROBE_RESP:
1904 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
1905 rx_status);
1906 break;
1907 case IEEE80211_STYPE_BEACON:
1908 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1909 rx_status);
1910 break;
1911 case IEEE80211_STYPE_AUTH:
1912 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
1913 break;
1914 case IEEE80211_STYPE_ASSOC_RESP:
1915 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 0);
1916 break;
1917 case IEEE80211_STYPE_REASSOC_RESP:
1918 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 1);
1919 break;
1920 case IEEE80211_STYPE_DEAUTH:
1921 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1922 break;
1923 case IEEE80211_STYPE_DISASSOC:
1924 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1925 break;
1926 }
1927
1928 kfree_skb(skb);
1929 }
1930
1931 static void ieee80211_sta_timer(unsigned long data)
1932 {
1933 struct ieee80211_sub_if_data *sdata =
1934 (struct ieee80211_sub_if_data *) data;
1935 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1936 struct ieee80211_local *local = sdata->local;
1937
1938 set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
1939 queue_work(local->hw.workqueue, &ifmgd->work);
1940 }
1941
1942 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata)
1943 {
1944 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1945 struct ieee80211_local *local = sdata->local;
1946
1947 if (local->ops->reset_tsf) {
1948 /* Reset own TSF to allow time synchronization work. */
1949 local->ops->reset_tsf(local_to_hw(local));
1950 }
1951
1952 ifmgd->wmm_last_param_set = -1; /* allow any WMM update */
1953
1954
1955 if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1956 ifmgd->auth_alg = WLAN_AUTH_OPEN;
1957 else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1958 ifmgd->auth_alg = WLAN_AUTH_SHARED_KEY;
1959 else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1960 ifmgd->auth_alg = WLAN_AUTH_LEAP;
1961 else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_FT)
1962 ifmgd->auth_alg = WLAN_AUTH_FT;
1963 else
1964 ifmgd->auth_alg = WLAN_AUTH_OPEN;
1965 ifmgd->auth_transaction = -1;
1966 ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
1967 ifmgd->assoc_scan_tries = 0;
1968 ifmgd->direct_probe_tries = 0;
1969 ifmgd->auth_tries = 0;
1970 ifmgd->assoc_tries = 0;
1971 netif_tx_stop_all_queues(sdata->dev);
1972 netif_carrier_off(sdata->dev);
1973 }
1974
1975 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata)
1976 {
1977 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1978 struct ieee80211_local *local = sdata->local;
1979 struct ieee80211_bss *bss;
1980 u8 *bssid = ifmgd->bssid, *ssid = ifmgd->ssid;
1981 u8 ssid_len = ifmgd->ssid_len;
1982 u16 capa_mask = WLAN_CAPABILITY_ESS;
1983 u16 capa_val = WLAN_CAPABILITY_ESS;
1984 struct ieee80211_channel *chan = local->oper_channel;
1985
1986 if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
1987 ifmgd->flags & (IEEE80211_STA_AUTO_SSID_SEL |
1988 IEEE80211_STA_AUTO_BSSID_SEL |
1989 IEEE80211_STA_AUTO_CHANNEL_SEL)) {
1990 capa_mask |= WLAN_CAPABILITY_PRIVACY;
1991 if (sdata->default_key)
1992 capa_val |= WLAN_CAPABILITY_PRIVACY;
1993 }
1994
1995 if (ifmgd->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
1996 chan = NULL;
1997
1998 if (ifmgd->flags & IEEE80211_STA_AUTO_BSSID_SEL)
1999 bssid = NULL;
2000
2001 if (ifmgd->flags & IEEE80211_STA_AUTO_SSID_SEL) {
2002 ssid = NULL;
2003 ssid_len = 0;
2004 }
2005
2006 bss = (void *)cfg80211_get_bss(local->hw.wiphy, chan,
2007 bssid, ssid, ssid_len,
2008 capa_mask, capa_val);
2009
2010 if (bss) {
2011 ieee80211_set_freq(sdata, bss->cbss.channel->center_freq);
2012 if (!(ifmgd->flags & IEEE80211_STA_SSID_SET))
2013 ieee80211_sta_set_ssid(sdata, bss->ssid,
2014 bss->ssid_len);
2015 ieee80211_sta_set_bssid(sdata, bss->cbss.bssid);
2016 ieee80211_sta_def_wmm_params(sdata, bss->supp_rates_len,
2017 bss->supp_rates);
2018 if (sdata->u.mgd.mfp == IEEE80211_MFP_REQUIRED)
2019 sdata->u.mgd.flags |= IEEE80211_STA_MFP_ENABLED;
2020 else
2021 sdata->u.mgd.flags &= ~IEEE80211_STA_MFP_ENABLED;
2022
2023 /* Send out direct probe if no probe resp was received or
2024 * the one we have is outdated
2025 */
2026 if (!bss->last_probe_resp ||
2027 time_after(jiffies, bss->last_probe_resp
2028 + IEEE80211_SCAN_RESULT_EXPIRE))
2029 ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2030 else
2031 ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
2032
2033 ieee80211_rx_bss_put(local, bss);
2034 ieee80211_sta_reset_auth(sdata);
2035 return 0;
2036 } else {
2037 if (ifmgd->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2038 ifmgd->assoc_scan_tries++;
2039 /* XXX maybe racy? */
2040 if (local->scan_req)
2041 return -1;
2042 memcpy(local->int_scan_req.ssids[0].ssid,
2043 ifmgd->ssid, IEEE80211_MAX_SSID_LEN);
2044 if (ifmgd->flags & IEEE80211_STA_AUTO_SSID_SEL)
2045 local->int_scan_req.ssids[0].ssid_len = 0;
2046 else
2047 local->int_scan_req.ssids[0].ssid_len = ifmgd->ssid_len;
2048
2049 if (ieee80211_start_scan(sdata, &local->int_scan_req))
2050 ieee80211_scan_failed(local);
2051
2052 ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
2053 set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
2054 } else {
2055 ifmgd->assoc_scan_tries = 0;
2056 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
2057 }
2058 }
2059 return -1;
2060 }
2061
2062
2063 static void ieee80211_sta_work(struct work_struct *work)
2064 {
2065 struct ieee80211_sub_if_data *sdata =
2066 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
2067 struct ieee80211_local *local = sdata->local;
2068 struct ieee80211_if_managed *ifmgd;
2069 struct sk_buff *skb;
2070
2071 if (!netif_running(sdata->dev))
2072 return;
2073
2074 if (local->sw_scanning || local->hw_scanning)
2075 return;
2076
2077 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2078 return;
2079 ifmgd = &sdata->u.mgd;
2080
2081 while ((skb = skb_dequeue(&ifmgd->skb_queue)))
2082 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2083
2084 if (ifmgd->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2085 ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2086 ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE &&
2087 test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request)) {
2088 /*
2089 * The call to ieee80211_start_scan can fail but ieee80211_request_scan
2090 * (which queued ieee80211_sta_work) did not return an error. Thus, call
2091 * ieee80211_scan_failed here if ieee80211_start_scan fails in order to
2092 * notify the scan requester.
2093 */
2094 if (ieee80211_start_scan(sdata, local->scan_req))
2095 ieee80211_scan_failed(local);
2096 return;
2097 }
2098
2099 if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request)) {
2100 if (ieee80211_sta_config_auth(sdata))
2101 return;
2102 clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
2103 } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request))
2104 return;
2105
2106 switch (ifmgd->state) {
2107 case IEEE80211_STA_MLME_DISABLED:
2108 break;
2109 case IEEE80211_STA_MLME_DIRECT_PROBE:
2110 ieee80211_direct_probe(sdata);
2111 break;
2112 case IEEE80211_STA_MLME_AUTHENTICATE:
2113 ieee80211_authenticate(sdata);
2114 break;
2115 case IEEE80211_STA_MLME_ASSOCIATE:
2116 ieee80211_associate(sdata);
2117 break;
2118 case IEEE80211_STA_MLME_ASSOCIATED:
2119 ieee80211_associated(sdata);
2120 break;
2121 default:
2122 WARN_ON(1);
2123 break;
2124 }
2125
2126 if (ieee80211_privacy_mismatch(sdata)) {
2127 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2128 "mixed-cell disabled - disassociate\n", sdata->dev->name);
2129
2130 ieee80211_set_disassoc(sdata, false, true,
2131 WLAN_REASON_UNSPECIFIED);
2132 }
2133 }
2134
2135 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2136 {
2137 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2138 /*
2139 * Need to update last_beacon to avoid beacon loss
2140 * test to trigger.
2141 */
2142 sdata->u.mgd.last_beacon = jiffies;
2143
2144
2145 queue_work(sdata->local->hw.workqueue,
2146 &sdata->u.mgd.work);
2147 }
2148 }
2149
2150 /* interface setup */
2151 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2152 {
2153 struct ieee80211_if_managed *ifmgd;
2154
2155 ifmgd = &sdata->u.mgd;
2156 INIT_WORK(&ifmgd->work, ieee80211_sta_work);
2157 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2158 INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
2159 setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2160 (unsigned long) sdata);
2161 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2162 (unsigned long) sdata);
2163 skb_queue_head_init(&ifmgd->skb_queue);
2164
2165 ifmgd->capab = WLAN_CAPABILITY_ESS;
2166 ifmgd->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2167 IEEE80211_AUTH_ALG_SHARED_KEY;
2168 ifmgd->flags |= IEEE80211_STA_CREATE_IBSS |
2169 IEEE80211_STA_AUTO_BSSID_SEL |
2170 IEEE80211_STA_AUTO_CHANNEL_SEL;
2171 if (sdata->local->hw.queues >= 4)
2172 ifmgd->flags |= IEEE80211_STA_WMM_ENABLED;
2173 }
2174
2175 /* configuration hooks */
2176 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata)
2177 {
2178 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2179 struct ieee80211_local *local = sdata->local;
2180
2181 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2182 return;
2183
2184 if ((ifmgd->flags & (IEEE80211_STA_BSSID_SET |
2185 IEEE80211_STA_AUTO_BSSID_SEL)) &&
2186 (ifmgd->flags & (IEEE80211_STA_SSID_SET |
2187 IEEE80211_STA_AUTO_SSID_SEL))) {
2188
2189 if (ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)
2190 ieee80211_set_disassoc(sdata, true, true,
2191 WLAN_REASON_DEAUTH_LEAVING);
2192
2193 if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) ||
2194 ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE)
2195 set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
2196 else if (ifmgd->flags & IEEE80211_STA_EXT_SME)
2197 set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
2198 queue_work(local->hw.workqueue, &ifmgd->work);
2199 }
2200 }
2201
2202 int ieee80211_sta_commit(struct ieee80211_sub_if_data *sdata)
2203 {
2204 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2205
2206 if (ifmgd->ssid_len)
2207 ifmgd->flags |= IEEE80211_STA_SSID_SET;
2208 else
2209 ifmgd->flags &= ~IEEE80211_STA_SSID_SET;
2210
2211 return 0;
2212 }
2213
2214 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2215 {
2216 struct ieee80211_if_managed *ifmgd;
2217
2218 if (len > IEEE80211_MAX_SSID_LEN)
2219 return -EINVAL;
2220
2221 ifmgd = &sdata->u.mgd;
2222
2223 if (ifmgd->ssid_len != len || memcmp(ifmgd->ssid, ssid, len) != 0) {
2224 /*
2225 * Do not use reassociation if SSID is changed (different ESS).
2226 */
2227 ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2228 memset(ifmgd->ssid, 0, sizeof(ifmgd->ssid));
2229 memcpy(ifmgd->ssid, ssid, len);
2230 ifmgd->ssid_len = len;
2231 }
2232
2233 return ieee80211_sta_commit(sdata);
2234 }
2235
2236 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2237 {
2238 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2239 memcpy(ssid, ifmgd->ssid, ifmgd->ssid_len);
2240 *len = ifmgd->ssid_len;
2241 return 0;
2242 }
2243
2244 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2245 {
2246 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2247
2248 if (is_valid_ether_addr(bssid)) {
2249 memcpy(ifmgd->bssid, bssid, ETH_ALEN);
2250 ifmgd->flags |= IEEE80211_STA_BSSID_SET;
2251 } else {
2252 memset(ifmgd->bssid, 0, ETH_ALEN);
2253 ifmgd->flags &= ~IEEE80211_STA_BSSID_SET;
2254 }
2255
2256 if (netif_running(sdata->dev)) {
2257 if (ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID)) {
2258 printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2259 "the low-level driver\n", sdata->dev->name);
2260 }
2261 }
2262
2263 return ieee80211_sta_commit(sdata);
2264 }
2265
2266 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata,
2267 const char *ie, size_t len)
2268 {
2269 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2270
2271 kfree(ifmgd->extra_ie);
2272 if (len == 0) {
2273 ifmgd->extra_ie = NULL;
2274 ifmgd->extra_ie_len = 0;
2275 return 0;
2276 }
2277 ifmgd->extra_ie = kmalloc(len, GFP_KERNEL);
2278 if (!ifmgd->extra_ie) {
2279 ifmgd->extra_ie_len = 0;
2280 return -ENOMEM;
2281 }
2282 memcpy(ifmgd->extra_ie, ie, len);
2283 ifmgd->extra_ie_len = len;
2284 return 0;
2285 }
2286
2287 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2288 {
2289 printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2290 sdata->dev->name, reason);
2291
2292 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2293 return -EINVAL;
2294
2295 ieee80211_set_disassoc(sdata, true, true, reason);
2296 return 0;
2297 }
2298
2299 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2300 {
2301 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2302
2303 printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2304 sdata->dev->name, reason);
2305
2306 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2307 return -EINVAL;
2308
2309 if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED))
2310 return -ENOLINK;
2311
2312 ieee80211_set_disassoc(sdata, false, true, reason);
2313 return 0;
2314 }
2315
2316 /* scan finished notification */
2317 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2318 {
2319 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2320
2321 /* Restart STA timers */
2322 rcu_read_lock();
2323 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2324 ieee80211_restart_sta_timer(sdata);
2325 rcu_read_unlock();
2326 }
Linux kernel - Deliverables
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