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davinci: Macro to convert GPIO signal to GPIO pin number
[linux-ginger.git] / net / mac80211 / mlme.c
blob07e7e41816be31cdd210f0dca41219525624c22b
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 <linux/pm_qos_params.h>
21 #include <linux/crc32.h>
22 #include <net/mac80211.h>
23 #include <asm/unaligned.h>
24
25 #include "ieee80211_i.h"
26 #include "driver-ops.h"
27 #include "rate.h"
28 #include "led.h"
29
30 #define IEEE80211_ASSOC_SCANS_MAX_TRIES 2
31 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
32 #define IEEE80211_AUTH_MAX_TRIES 3
33 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
34 #define IEEE80211_ASSOC_MAX_TRIES 3
35 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
36 #define IEEE80211_PROBE_WAIT (HZ / 5)
37 #define IEEE80211_PROBE_IDLE_TIME (60 * HZ)
38 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
39
40 #define TMR_RUNNING_TIMER 0
41 #define TMR_RUNNING_CHANSW 1
42
43 /* utils */
44 static int ecw2cw(int ecw)
45 {
46 return (1 << ecw) - 1;
47 }
48
49 static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie)
50 {
51 u8 *end, *pos;
52
53 pos = bss->cbss.information_elements;
54 if (pos == NULL)
55 return NULL;
56 end = pos + bss->cbss.len_information_elements;
57
58 while (pos + 1 < end) {
59 if (pos + 2 + pos[1] > end)
60 break;
61 if (pos[0] == ie)
62 return pos;
63 pos += 2 + pos[1];
64 }
65
66 return NULL;
67 }
68
69 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
70 struct ieee80211_supported_band *sband,
71 u32 *rates)
72 {
73 int i, j, count;
74 *rates = 0;
75 count = 0;
76 for (i = 0; i < bss->supp_rates_len; i++) {
77 int rate = (bss->supp_rates[i] & 0x7F) * 5;
78
79 for (j = 0; j < sband->n_bitrates; j++)
80 if (sband->bitrates[j].bitrate == rate) {
81 *rates |= BIT(j);
82 count++;
83 break;
84 }
85 }
86
87 return count;
88 }
89
90 /*
91 * ieee80211_enable_ht should be called only after the operating band
92 * has been determined as ht configuration depends on the hw's
93 * HT abilities for a specific band.
94 */
95 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
96 struct ieee80211_ht_info *hti,
97 u16 ap_ht_cap_flags)
98 {
99 struct ieee80211_local *local = sdata->local;
100 struct ieee80211_supported_band *sband;
101 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
102 struct sta_info *sta;
103 u32 changed = 0;
104 u16 ht_opmode;
105 bool enable_ht = true, ht_changed;
106 enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
107
108 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
109
110 /* HT is not supported */
111 if (!sband->ht_cap.ht_supported)
112 enable_ht = false;
113
114 /* check that channel matches the right operating channel */
115 if (local->hw.conf.channel->center_freq !=
116 ieee80211_channel_to_frequency(hti->control_chan))
117 enable_ht = false;
118
119 if (enable_ht) {
120 channel_type = NL80211_CHAN_HT20;
121
122 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
123 (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
124 (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
125 switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
126 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
127 if (!(local->hw.conf.channel->flags &
128 IEEE80211_CHAN_NO_HT40PLUS))
129 channel_type = NL80211_CHAN_HT40PLUS;
130 break;
131 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
132 if (!(local->hw.conf.channel->flags &
133 IEEE80211_CHAN_NO_HT40MINUS))
134 channel_type = NL80211_CHAN_HT40MINUS;
135 break;
136 }
137 }
138 }
139
140 ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
141 channel_type != local->hw.conf.channel_type;
142
143 local->oper_channel_type = channel_type;
144
145 if (ht_changed) {
146 /* channel_type change automatically detected */
147 ieee80211_hw_config(local, 0);
148
149 rcu_read_lock();
150
151 sta = sta_info_get(local, ifmgd->bssid);
152 if (sta)
153 rate_control_rate_update(local, sband, sta,
154 IEEE80211_RC_HT_CHANGED);
155
156 rcu_read_unlock();
157 }
158
159 /* disable HT */
160 if (!enable_ht)
161 return 0;
162
163 ht_opmode = le16_to_cpu(hti->operation_mode);
164
165 /* if bss configuration changed store the new one */
166 if (!sdata->ht_opmode_valid ||
167 sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
168 changed |= BSS_CHANGED_HT;
169 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
170 sdata->ht_opmode_valid = true;
171 }
172
173 return changed;
174 }
175
176 /* frame sending functions */
177
178 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
179 {
180 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
181 struct ieee80211_local *local = sdata->local;
182 struct sk_buff *skb;
183 struct ieee80211_mgmt *mgmt;
184 u8 *pos, *ies, *ht_ie;
185 int i, len, count, rates_len, supp_rates_len;
186 u16 capab;
187 struct ieee80211_bss *bss;
188 int wmm = 0;
189 struct ieee80211_supported_band *sband;
190 u32 rates = 0;
191
192 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
193 sizeof(*mgmt) + 200 + ifmgd->extra_ie_len +
194 ifmgd->ssid_len);
195 if (!skb) {
196 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
197 "frame\n", sdata->dev->name);
198 return;
199 }
200 skb_reserve(skb, local->hw.extra_tx_headroom);
201
202 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
203
204 capab = ifmgd->capab;
205
206 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
207 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
208 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
209 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
210 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
211 }
212
213 bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
214 local->hw.conf.channel->center_freq,
215 ifmgd->ssid, ifmgd->ssid_len);
216 if (bss) {
217 if (bss->cbss.capability & WLAN_CAPABILITY_PRIVACY)
218 capab |= WLAN_CAPABILITY_PRIVACY;
219 if (bss->wmm_used)
220 wmm = 1;
221
222 /* get all rates supported by the device and the AP as
223 * some APs don't like getting a superset of their rates
224 * in the association request (e.g. D-Link DAP 1353 in
225 * b-only mode) */
226 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
227
228 if ((bss->cbss.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
229 (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
230 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
231
232 ieee80211_rx_bss_put(local, bss);
233 } else {
234 rates = ~0;
235 rates_len = sband->n_bitrates;
236 }
237
238 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
239 memset(mgmt, 0, 24);
240 memcpy(mgmt->da, ifmgd->bssid, ETH_ALEN);
241 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
242 memcpy(mgmt->bssid, ifmgd->bssid, ETH_ALEN);
243
244 if (ifmgd->flags & IEEE80211_STA_PREV_BSSID_SET) {
245 skb_put(skb, 10);
246 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
247 IEEE80211_STYPE_REASSOC_REQ);
248 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
249 mgmt->u.reassoc_req.listen_interval =
250 cpu_to_le16(local->hw.conf.listen_interval);
251 memcpy(mgmt->u.reassoc_req.current_ap, ifmgd->prev_bssid,
252 ETH_ALEN);
253 } else {
254 skb_put(skb, 4);
255 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
256 IEEE80211_STYPE_ASSOC_REQ);
257 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
258 mgmt->u.assoc_req.listen_interval =
259 cpu_to_le16(local->hw.conf.listen_interval);
260 }
261
262 /* SSID */
263 ies = pos = skb_put(skb, 2 + ifmgd->ssid_len);
264 *pos++ = WLAN_EID_SSID;
265 *pos++ = ifmgd->ssid_len;
266 memcpy(pos, ifmgd->ssid, ifmgd->ssid_len);
267
268 /* add all rates which were marked to be used above */
269 supp_rates_len = rates_len;
270 if (supp_rates_len > 8)
271 supp_rates_len = 8;
272
273 len = sband->n_bitrates;
274 pos = skb_put(skb, supp_rates_len + 2);
275 *pos++ = WLAN_EID_SUPP_RATES;
276 *pos++ = supp_rates_len;
277
278 count = 0;
279 for (i = 0; i < sband->n_bitrates; i++) {
280 if (BIT(i) & rates) {
281 int rate = sband->bitrates[i].bitrate;
282 *pos++ = (u8) (rate / 5);
283 if (++count == 8)
284 break;
285 }
286 }
287
288 if (rates_len > count) {
289 pos = skb_put(skb, rates_len - count + 2);
290 *pos++ = WLAN_EID_EXT_SUPP_RATES;
291 *pos++ = rates_len - count;
292
293 for (i++; i < sband->n_bitrates; i++) {
294 if (BIT(i) & rates) {
295 int rate = sband->bitrates[i].bitrate;
296 *pos++ = (u8) (rate / 5);
297 }
298 }
299 }
300
301 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
302 /* 1. power capabilities */
303 pos = skb_put(skb, 4);
304 *pos++ = WLAN_EID_PWR_CAPABILITY;
305 *pos++ = 2;
306 *pos++ = 0; /* min tx power */
307 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
308
309 /* 2. supported channels */
310 /* TODO: get this in reg domain format */
311 pos = skb_put(skb, 2 * sband->n_channels + 2);
312 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
313 *pos++ = 2 * sband->n_channels;
314 for (i = 0; i < sband->n_channels; i++) {
315 *pos++ = ieee80211_frequency_to_channel(
316 sband->channels[i].center_freq);
317 *pos++ = 1; /* one channel in the subband*/
318 }
319 }
320
321 if (ifmgd->extra_ie) {
322 pos = skb_put(skb, ifmgd->extra_ie_len);
323 memcpy(pos, ifmgd->extra_ie, ifmgd->extra_ie_len);
324 }
325
326 if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED)) {
327 pos = skb_put(skb, 9);
328 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
329 *pos++ = 7; /* len */
330 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
331 *pos++ = 0x50;
332 *pos++ = 0xf2;
333 *pos++ = 2; /* WME */
334 *pos++ = 0; /* WME info */
335 *pos++ = 1; /* WME ver */
336 *pos++ = 0;
337 }
338
339 /* wmm support is a must to HT */
340 /*
341 * IEEE802.11n does not allow TKIP/WEP as pairwise
342 * ciphers in HT mode. We still associate in non-ht
343 * mode (11a/b/g) if any one of these ciphers is
344 * configured as pairwise.
345 */
346 if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
347 sband->ht_cap.ht_supported &&
348 (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) &&
349 ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
350 (!(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))) {
351 struct ieee80211_ht_info *ht_info =
352 (struct ieee80211_ht_info *)(ht_ie + 2);
353 u16 cap = sband->ht_cap.cap;
354 __le16 tmp;
355 u32 flags = local->hw.conf.channel->flags;
356
357 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
358 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
359 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
360 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
361 cap &= ~IEEE80211_HT_CAP_SGI_40;
362 }
363 break;
364 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
365 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
366 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
367 cap &= ~IEEE80211_HT_CAP_SGI_40;
368 }
369 break;
370 }
371
372 tmp = cpu_to_le16(cap);
373 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
374 *pos++ = WLAN_EID_HT_CAPABILITY;
375 *pos++ = sizeof(struct ieee80211_ht_cap);
376 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
377 memcpy(pos, &tmp, sizeof(u16));
378 pos += sizeof(u16);
379 /* TODO: needs a define here for << 2 */
380 *pos++ = sband->ht_cap.ampdu_factor |
381 (sband->ht_cap.ampdu_density << 2);
382 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
383 }
384
385 kfree(ifmgd->assocreq_ies);
386 ifmgd->assocreq_ies_len = (skb->data + skb->len) - ies;
387 ifmgd->assocreq_ies = kmalloc(ifmgd->assocreq_ies_len, GFP_KERNEL);
388 if (ifmgd->assocreq_ies)
389 memcpy(ifmgd->assocreq_ies, ies, ifmgd->assocreq_ies_len);
390
391 ieee80211_tx_skb(sdata, skb, 0);
392 }
393
394
395 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
396 u16 stype, u16 reason)
397 {
398 struct ieee80211_local *local = sdata->local;
399 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
400 struct sk_buff *skb;
401 struct ieee80211_mgmt *mgmt;
402
403 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
404 if (!skb) {
405 printk(KERN_DEBUG "%s: failed to allocate buffer for "
406 "deauth/disassoc frame\n", sdata->dev->name);
407 return;
408 }
409 skb_reserve(skb, local->hw.extra_tx_headroom);
410
411 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
412 memset(mgmt, 0, 24);
413 memcpy(mgmt->da, ifmgd->bssid, ETH_ALEN);
414 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
415 memcpy(mgmt->bssid, ifmgd->bssid, ETH_ALEN);
416 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
417 skb_put(skb, 2);
418 /* u.deauth.reason_code == u.disassoc.reason_code */
419 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
420
421 if (stype == IEEE80211_STYPE_DEAUTH)
422 cfg80211_send_deauth(sdata->dev, (u8 *) mgmt, skb->len);
423 else
424 cfg80211_send_disassoc(sdata->dev, (u8 *) mgmt, skb->len);
425 ieee80211_tx_skb(sdata, skb, ifmgd->flags & IEEE80211_STA_MFP_ENABLED);
426 }
427
428 void ieee80211_send_pspoll(struct ieee80211_local *local,
429 struct ieee80211_sub_if_data *sdata)
430 {
431 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
432 struct ieee80211_pspoll *pspoll;
433 struct sk_buff *skb;
434 u16 fc;
435
436 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
437 if (!skb) {
438 printk(KERN_DEBUG "%s: failed to allocate buffer for "
439 "pspoll frame\n", sdata->dev->name);
440 return;
441 }
442 skb_reserve(skb, local->hw.extra_tx_headroom);
443
444 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
445 memset(pspoll, 0, sizeof(*pspoll));
446 fc = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL | IEEE80211_FCTL_PM;
447 pspoll->frame_control = cpu_to_le16(fc);
448 pspoll->aid = cpu_to_le16(ifmgd->aid);
449
450 /* aid in PS-Poll has its two MSBs each set to 1 */
451 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
452
453 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
454 memcpy(pspoll->ta, sdata->dev->dev_addr, ETH_ALEN);
455
456 ieee80211_tx_skb(sdata, skb, 0);
457 }
458
459 void ieee80211_send_nullfunc(struct ieee80211_local *local,
460 struct ieee80211_sub_if_data *sdata,
461 int powersave)
462 {
463 struct sk_buff *skb;
464 struct ieee80211_hdr *nullfunc;
465 __le16 fc;
466
467 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
468 return;
469
470 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
471 if (!skb) {
472 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
473 "frame\n", sdata->dev->name);
474 return;
475 }
476 skb_reserve(skb, local->hw.extra_tx_headroom);
477
478 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
479 memset(nullfunc, 0, 24);
480 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
481 IEEE80211_FCTL_TODS);
482 if (powersave)
483 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
484 nullfunc->frame_control = fc;
485 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
486 memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
487 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
488
489 ieee80211_tx_skb(sdata, skb, 0);
490 }
491
492 /* spectrum management related things */
493 static void ieee80211_chswitch_work(struct work_struct *work)
494 {
495 struct ieee80211_sub_if_data *sdata =
496 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
497 struct ieee80211_bss *bss;
498 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
499
500 if (!netif_running(sdata->dev))
501 return;
502
503 bss = ieee80211_rx_bss_get(sdata->local, ifmgd->bssid,
504 sdata->local->hw.conf.channel->center_freq,
505 ifmgd->ssid, ifmgd->ssid_len);
506 if (!bss)
507 goto exit;
508
509 sdata->local->oper_channel = sdata->local->csa_channel;
510 /* XXX: shouldn't really modify cfg80211-owned data! */
511 if (!ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL))
512 bss->cbss.channel = sdata->local->oper_channel;
513
514 ieee80211_rx_bss_put(sdata->local, bss);
515 exit:
516 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
517 ieee80211_wake_queues_by_reason(&sdata->local->hw,
518 IEEE80211_QUEUE_STOP_REASON_CSA);
519 }
520
521 static void ieee80211_chswitch_timer(unsigned long data)
522 {
523 struct ieee80211_sub_if_data *sdata =
524 (struct ieee80211_sub_if_data *) data;
525 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
526
527 if (sdata->local->quiescing) {
528 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
529 return;
530 }
531
532 queue_work(sdata->local->hw.workqueue, &ifmgd->chswitch_work);
533 }
534
535 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
536 struct ieee80211_channel_sw_ie *sw_elem,
537 struct ieee80211_bss *bss)
538 {
539 struct ieee80211_channel *new_ch;
540 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
541 int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
542
543 if (ifmgd->state != IEEE80211_STA_MLME_ASSOCIATED)
544 return;
545
546 if (sdata->local->sw_scanning || sdata->local->hw_scanning)
547 return;
548
549 /* Disregard subsequent beacons if we are already running a timer
550 processing a CSA */
551
552 if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
553 return;
554
555 new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
556 if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
557 return;
558
559 sdata->local->csa_channel = new_ch;
560
561 if (sw_elem->count <= 1) {
562 queue_work(sdata->local->hw.workqueue, &ifmgd->chswitch_work);
563 } else {
564 ieee80211_stop_queues_by_reason(&sdata->local->hw,
565 IEEE80211_QUEUE_STOP_REASON_CSA);
566 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
567 mod_timer(&ifmgd->chswitch_timer,
568 jiffies +
569 msecs_to_jiffies(sw_elem->count *
570 bss->cbss.beacon_interval));
571 }
572 }
573
574 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
575 u16 capab_info, u8 *pwr_constr_elem,
576 u8 pwr_constr_elem_len)
577 {
578 struct ieee80211_conf *conf = &sdata->local->hw.conf;
579
580 if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
581 return;
582
583 /* Power constraint IE length should be 1 octet */
584 if (pwr_constr_elem_len != 1)
585 return;
586
587 if ((*pwr_constr_elem <= conf->channel->max_power) &&
588 (*pwr_constr_elem != sdata->local->power_constr_level)) {
589 sdata->local->power_constr_level = *pwr_constr_elem;
590 ieee80211_hw_config(sdata->local, 0);
591 }
592 }
593
594 /* powersave */
595 static void ieee80211_enable_ps(struct ieee80211_local *local,
596 struct ieee80211_sub_if_data *sdata)
597 {
598 struct ieee80211_conf *conf = &local->hw.conf;
599
600 /*
601 * If we are scanning right now then the parameters will
602 * take effect when scan finishes.
603 */
604 if (local->hw_scanning || local->sw_scanning)
605 return;
606
607 if (conf->dynamic_ps_timeout > 0 &&
608 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
609 mod_timer(&local->dynamic_ps_timer, jiffies +
610 msecs_to_jiffies(conf->dynamic_ps_timeout));
611 } else {
612 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
613 ieee80211_send_nullfunc(local, sdata, 1);
614 conf->flags |= IEEE80211_CONF_PS;
615 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
616 }
617 }
618
619 static void ieee80211_change_ps(struct ieee80211_local *local)
620 {
621 struct ieee80211_conf *conf = &local->hw.conf;
622
623 if (local->ps_sdata) {
624 ieee80211_enable_ps(local, local->ps_sdata);
625 } else if (conf->flags & IEEE80211_CONF_PS) {
626 conf->flags &= ~IEEE80211_CONF_PS;
627 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
628 del_timer_sync(&local->dynamic_ps_timer);
629 cancel_work_sync(&local->dynamic_ps_enable_work);
630 }
631 }
632
633 /* need to hold RTNL or interface lock */
634 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
635 {
636 struct ieee80211_sub_if_data *sdata, *found = NULL;
637 int count = 0;
638
639 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
640 local->ps_sdata = NULL;
641 return;
642 }
643
644 list_for_each_entry(sdata, &local->interfaces, list) {
645 if (!netif_running(sdata->dev))
646 continue;
647 if (sdata->vif.type != NL80211_IFTYPE_STATION)
648 continue;
649 found = sdata;
650 count++;
651 }
652
653 if (count == 1 && found->u.mgd.powersave &&
654 (found->u.mgd.flags & IEEE80211_STA_ASSOCIATED) &&
655 !(found->u.mgd.flags & IEEE80211_STA_PROBEREQ_POLL)) {
656 s32 beaconint_us;
657
658 if (latency < 0)
659 latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
660
661 beaconint_us = ieee80211_tu_to_usec(
662 found->vif.bss_conf.beacon_int);
663
664 if (beaconint_us > latency) {
665 local->ps_sdata = NULL;
666 } else {
667 u8 dtimper = found->vif.bss_conf.dtim_period;
668 int maxslp = 1;
669
670 if (dtimper > 1)
671 maxslp = min_t(int, dtimper,
672 latency / beaconint_us);
673
674 local->hw.conf.max_sleep_period = maxslp;
675 local->ps_sdata = found;
676 }
677 } else {
678 local->ps_sdata = NULL;
679 }
680
681 ieee80211_change_ps(local);
682 }
683
684 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
685 {
686 struct ieee80211_local *local =
687 container_of(work, struct ieee80211_local,
688 dynamic_ps_disable_work);
689
690 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
691 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
692 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
693 }
694
695 ieee80211_wake_queues_by_reason(&local->hw,
696 IEEE80211_QUEUE_STOP_REASON_PS);
697 }
698
699 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
700 {
701 struct ieee80211_local *local =
702 container_of(work, struct ieee80211_local,
703 dynamic_ps_enable_work);
704 struct ieee80211_sub_if_data *sdata = local->ps_sdata;
705
706 /* can only happen when PS was just disabled anyway */
707 if (!sdata)
708 return;
709
710 if (local->hw.conf.flags & IEEE80211_CONF_PS)
711 return;
712
713 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
714 ieee80211_send_nullfunc(local, sdata, 1);
715
716 local->hw.conf.flags |= IEEE80211_CONF_PS;
717 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
718 }
719
720 void ieee80211_dynamic_ps_timer(unsigned long data)
721 {
722 struct ieee80211_local *local = (void *) data;
723
724 if (local->quiescing || local->suspended)
725 return;
726
727 queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
728 }
729
730 /* MLME */
731 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
732 struct ieee80211_if_managed *ifmgd,
733 u8 *wmm_param, size_t wmm_param_len)
734 {
735 struct ieee80211_tx_queue_params params;
736 size_t left;
737 int count;
738 u8 *pos;
739
740 if (!(ifmgd->flags & IEEE80211_STA_WMM_ENABLED))
741 return;
742
743 if (!wmm_param)
744 return;
745
746 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
747 return;
748 count = wmm_param[6] & 0x0f;
749 if (count == ifmgd->wmm_last_param_set)
750 return;
751 ifmgd->wmm_last_param_set = count;
752
753 pos = wmm_param + 8;
754 left = wmm_param_len - 8;
755
756 memset(&params, 0, sizeof(params));
757
758 local->wmm_acm = 0;
759 for (; left >= 4; left -= 4, pos += 4) {
760 int aci = (pos[0] >> 5) & 0x03;
761 int acm = (pos[0] >> 4) & 0x01;
762 int queue;
763
764 switch (aci) {
765 case 1: /* AC_BK */
766 queue = 3;
767 if (acm)
768 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
769 break;
770 case 2: /* AC_VI */
771 queue = 1;
772 if (acm)
773 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
774 break;
775 case 3: /* AC_VO */
776 queue = 0;
777 if (acm)
778 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
779 break;
780 case 0: /* AC_BE */
781 default:
782 queue = 2;
783 if (acm)
784 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
785 break;
786 }
787
788 params.aifs = pos[0] & 0x0f;
789 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
790 params.cw_min = ecw2cw(pos[1] & 0x0f);
791 params.txop = get_unaligned_le16(pos + 2);
792 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
793 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
794 "cWmin=%d cWmax=%d txop=%d\n",
795 wiphy_name(local->hw.wiphy), queue, aci, acm,
796 params.aifs, params.cw_min, params.cw_max, params.txop);
797 #endif
798 if (drv_conf_tx(local, queue, &params) && local->ops->conf_tx)
799 printk(KERN_DEBUG "%s: failed to set TX queue "
800 "parameters for queue %d\n",
801 wiphy_name(local->hw.wiphy), queue);
802 }
803 }
804
805 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
806 u16 capab, bool erp_valid, u8 erp)
807 {
808 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
809 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
810 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
811 #endif
812 u32 changed = 0;
813 bool use_protection;
814 bool use_short_preamble;
815 bool use_short_slot;
816
817 if (erp_valid) {
818 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
819 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
820 } else {
821 use_protection = false;
822 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
823 }
824
825 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
826
827 if (use_protection != bss_conf->use_cts_prot) {
828 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
829 if (net_ratelimit()) {
830 printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
831 sdata->dev->name,
832 use_protection ? "enabled" : "disabled",
833 ifmgd->bssid);
834 }
835 #endif
836 bss_conf->use_cts_prot = use_protection;
837 changed |= BSS_CHANGED_ERP_CTS_PROT;
838 }
839
840 if (use_short_preamble != bss_conf->use_short_preamble) {
841 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
842 if (net_ratelimit()) {
843 printk(KERN_DEBUG "%s: switched to %s barker preamble"
844 " (BSSID=%pM)\n",
845 sdata->dev->name,
846 use_short_preamble ? "short" : "long",
847 ifmgd->bssid);
848 }
849 #endif
850 bss_conf->use_short_preamble = use_short_preamble;
851 changed |= BSS_CHANGED_ERP_PREAMBLE;
852 }
853
854 if (use_short_slot != bss_conf->use_short_slot) {
855 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
856 if (net_ratelimit()) {
857 printk(KERN_DEBUG "%s: switched to %s slot time"
858 " (BSSID=%pM)\n",
859 sdata->dev->name,
860 use_short_slot ? "short" : "long",
861 ifmgd->bssid);
862 }
863 #endif
864 bss_conf->use_short_slot = use_short_slot;
865 changed |= BSS_CHANGED_ERP_SLOT;
866 }
867
868 return changed;
869 }
870
871 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata)
872 {
873 union iwreq_data wrqu;
874
875 memset(&wrqu, 0, sizeof(wrqu));
876 if (sdata->u.mgd.flags & IEEE80211_STA_ASSOCIATED)
877 memcpy(wrqu.ap_addr.sa_data, sdata->u.mgd.bssid, ETH_ALEN);
878 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
879 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
880 }
881
882 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata)
883 {
884 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
885 char *buf;
886 size_t len;
887 int i;
888 union iwreq_data wrqu;
889
890 if (!ifmgd->assocreq_ies && !ifmgd->assocresp_ies)
891 return;
892
893 buf = kmalloc(50 + 2 * (ifmgd->assocreq_ies_len +
894 ifmgd->assocresp_ies_len), GFP_KERNEL);
895 if (!buf)
896 return;
897
898 len = sprintf(buf, "ASSOCINFO(");
899 if (ifmgd->assocreq_ies) {
900 len += sprintf(buf + len, "ReqIEs=");
901 for (i = 0; i < ifmgd->assocreq_ies_len; i++) {
902 len += sprintf(buf + len, "%02x",
903 ifmgd->assocreq_ies[i]);
904 }
905 }
906 if (ifmgd->assocresp_ies) {
907 if (ifmgd->assocreq_ies)
908 len += sprintf(buf + len, " ");
909 len += sprintf(buf + len, "RespIEs=");
910 for (i = 0; i < ifmgd->assocresp_ies_len; i++) {
911 len += sprintf(buf + len, "%02x",
912 ifmgd->assocresp_ies[i]);
913 }
914 }
915 len += sprintf(buf + len, ")");
916
917 if (len > IW_CUSTOM_MAX) {
918 len = sprintf(buf, "ASSOCRESPIE=");
919 for (i = 0; i < ifmgd->assocresp_ies_len; i++) {
920 len += sprintf(buf + len, "%02x",
921 ifmgd->assocresp_ies[i]);
922 }
923 }
924
925 if (len <= IW_CUSTOM_MAX) {
926 memset(&wrqu, 0, sizeof(wrqu));
927 wrqu.data.length = len;
928 wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
929 }
930
931 kfree(buf);
932 }
933
934
935 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
936 u32 bss_info_changed)
937 {
938 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
939 struct ieee80211_local *local = sdata->local;
940 struct ieee80211_conf *conf = &local_to_hw(local)->conf;
941
942 struct ieee80211_bss *bss;
943
944 bss_info_changed |= BSS_CHANGED_ASSOC;
945 ifmgd->flags |= IEEE80211_STA_ASSOCIATED;
946
947 bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
948 conf->channel->center_freq,
949 ifmgd->ssid, ifmgd->ssid_len);
950 if (bss) {
951 /* set timing information */
952 sdata->vif.bss_conf.beacon_int = bss->cbss.beacon_interval;
953 sdata->vif.bss_conf.timestamp = bss->cbss.tsf;
954 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
955
956 bss_info_changed |= BSS_CHANGED_BEACON_INT;
957 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
958 bss->cbss.capability, bss->has_erp_value, bss->erp_value);
959
960 cfg80211_hold_bss(&bss->cbss);
961
962 ieee80211_rx_bss_put(local, bss);
963 }
964
965 ifmgd->flags |= IEEE80211_STA_PREV_BSSID_SET;
966 memcpy(ifmgd->prev_bssid, sdata->u.mgd.bssid, ETH_ALEN);
967 ieee80211_sta_send_associnfo(sdata);
968
969 ifmgd->last_probe = jiffies;
970 ieee80211_led_assoc(local, 1);
971
972 sdata->vif.bss_conf.assoc = 1;
973 /*
974 * For now just always ask the driver to update the basic rateset
975 * when we have associated, we aren't checking whether it actually
976 * changed or not.
977 */
978 bss_info_changed |= BSS_CHANGED_BASIC_RATES;
979
980 /* And the BSSID changed - we're associated now */
981 bss_info_changed |= BSS_CHANGED_BSSID;
982
983 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
984
985 /* will be same as sdata */
986 if (local->ps_sdata) {
987 mutex_lock(&local->iflist_mtx);
988 ieee80211_recalc_ps(local, -1);
989 mutex_unlock(&local->iflist_mtx);
990 }
991
992 netif_tx_start_all_queues(sdata->dev);
993 netif_carrier_on(sdata->dev);
994
995 ieee80211_sta_send_apinfo(sdata);
996 }
997
998 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata)
999 {
1000 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1001 struct ieee80211_local *local = sdata->local;
1002
1003 ifmgd->direct_probe_tries++;
1004 if (ifmgd->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
1005 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
1006 sdata->dev->name, ifmgd->bssid);
1007 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1008 ieee80211_recalc_idle(local);
1009 cfg80211_send_auth_timeout(sdata->dev, ifmgd->bssid);
1010
1011 /*
1012 * Most likely AP is not in the range so remove the
1013 * bss information associated to the AP
1014 */
1015 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
1016 sdata->local->hw.conf.channel->center_freq,
1017 ifmgd->ssid, ifmgd->ssid_len);
1018
1019 /*
1020 * We might have a pending scan which had no chance to run yet
1021 * due to state == IEEE80211_STA_MLME_DIRECT_PROBE.
1022 * Hence, queue the STAs work again
1023 */
1024 queue_work(local->hw.workqueue, &ifmgd->work);
1025 return;
1026 }
1027
1028 printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
1029 sdata->dev->name, ifmgd->bssid,
1030 ifmgd->direct_probe_tries);
1031
1032 ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1033
1034 /* Direct probe is sent to broadcast address as some APs
1035 * will not answer to direct packet in unassociated state.
1036 */
1037 ieee80211_send_probe_req(sdata, NULL,
1038 ifmgd->ssid, ifmgd->ssid_len, NULL, 0);
1039
1040 mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
1041 }
1042
1043
1044 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata)
1045 {
1046 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1047 struct ieee80211_local *local = sdata->local;
1048 u8 *ies;
1049 size_t ies_len;
1050
1051 ifmgd->auth_tries++;
1052 if (ifmgd->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
1053 printk(KERN_DEBUG "%s: authentication with AP %pM"
1054 " timed out\n",
1055 sdata->dev->name, ifmgd->bssid);
1056 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1057 ieee80211_recalc_idle(local);
1058 cfg80211_send_auth_timeout(sdata->dev, ifmgd->bssid);
1059 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
1060 sdata->local->hw.conf.channel->center_freq,
1061 ifmgd->ssid, ifmgd->ssid_len);
1062
1063 /*
1064 * We might have a pending scan which had no chance to run yet
1065 * due to state == IEEE80211_STA_MLME_AUTHENTICATE.
1066 * Hence, queue the STAs work again
1067 */
1068 queue_work(local->hw.workqueue, &ifmgd->work);
1069 return;
1070 }
1071
1072 ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
1073 printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
1074 sdata->dev->name, ifmgd->bssid);
1075
1076 if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
1077 ies = ifmgd->sme_auth_ie;
1078 ies_len = ifmgd->sme_auth_ie_len;
1079 } else {
1080 ies = NULL;
1081 ies_len = 0;
1082 }
1083 ieee80211_send_auth(sdata, 1, ifmgd->auth_alg, ies, ies_len,
1084 ifmgd->bssid, 0);
1085 ifmgd->auth_transaction = 2;
1086
1087 mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
1088 }
1089
1090 /*
1091 * The disassoc 'reason' argument can be either our own reason
1092 * if self disconnected or a reason code from the AP.
1093 */
1094 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1095 bool deauth, bool self_disconnected,
1096 u16 reason)
1097 {
1098 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1099 struct ieee80211_local *local = sdata->local;
1100 struct ieee80211_conf *conf = &local_to_hw(local)->conf;
1101 struct ieee80211_bss *bss;
1102 struct sta_info *sta;
1103 u32 changed = 0, config_changed = 0;
1104
1105 if (deauth) {
1106 ifmgd->direct_probe_tries = 0;
1107 ifmgd->auth_tries = 0;
1108 }
1109 ifmgd->assoc_scan_tries = 0;
1110 ifmgd->assoc_tries = 0;
1111
1112 netif_tx_stop_all_queues(sdata->dev);
1113 netif_carrier_off(sdata->dev);
1114
1115 rcu_read_lock();
1116 sta = sta_info_get(local, ifmgd->bssid);
1117 if (sta)
1118 ieee80211_sta_tear_down_BA_sessions(sta);
1119 rcu_read_unlock();
1120
1121 bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
1122 conf->channel->center_freq,
1123 ifmgd->ssid, ifmgd->ssid_len);
1124
1125 if (bss) {
1126 cfg80211_unhold_bss(&bss->cbss);
1127 ieee80211_rx_bss_put(local, bss);
1128 }
1129
1130 if (self_disconnected) {
1131 if (deauth)
1132 ieee80211_send_deauth_disassoc(sdata,
1133 IEEE80211_STYPE_DEAUTH, reason);
1134 else
1135 ieee80211_send_deauth_disassoc(sdata,
1136 IEEE80211_STYPE_DISASSOC, reason);
1137 }
1138
1139 ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
1140 changed |= ieee80211_reset_erp_info(sdata);
1141
1142 ieee80211_led_assoc(local, 0);
1143 changed |= BSS_CHANGED_ASSOC;
1144 sdata->vif.bss_conf.assoc = false;
1145
1146 ieee80211_sta_send_apinfo(sdata);
1147
1148 if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT) {
1149 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1150 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
1151 sdata->local->hw.conf.channel->center_freq,
1152 ifmgd->ssid, ifmgd->ssid_len);
1153 }
1154
1155 ieee80211_set_wmm_default(sdata);
1156
1157 ieee80211_recalc_idle(local);
1158
1159 /* channel(_type) changes are handled by ieee80211_hw_config */
1160 local->oper_channel_type = NL80211_CHAN_NO_HT;
1161
1162 /* on the next assoc, re-program HT parameters */
1163 sdata->ht_opmode_valid = false;
1164
1165 local->power_constr_level = 0;
1166
1167 del_timer_sync(&local->dynamic_ps_timer);
1168 cancel_work_sync(&local->dynamic_ps_enable_work);
1169
1170 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1171 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1172 config_changed |= IEEE80211_CONF_CHANGE_PS;
1173 }
1174
1175 ieee80211_hw_config(local, config_changed);
1176
1177 /* And the BSSID changed -- not very interesting here */
1178 changed |= BSS_CHANGED_BSSID;
1179 ieee80211_bss_info_change_notify(sdata, changed);
1180
1181 rcu_read_lock();
1182
1183 sta = sta_info_get(local, ifmgd->bssid);
1184 if (!sta) {
1185 rcu_read_unlock();
1186 return;
1187 }
1188
1189 sta_info_unlink(&sta);
1190
1191 rcu_read_unlock();
1192
1193 sta_info_destroy(sta);
1194 }
1195
1196 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
1197 {
1198 if (!sdata || !sdata->default_key ||
1199 sdata->default_key->conf.alg != ALG_WEP)
1200 return 0;
1201 return 1;
1202 }
1203
1204 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata)
1205 {
1206 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1207 struct ieee80211_local *local = sdata->local;
1208 struct ieee80211_bss *bss;
1209 int bss_privacy;
1210 int wep_privacy;
1211 int privacy_invoked;
1212
1213 if (!ifmgd || (ifmgd->flags & IEEE80211_STA_EXT_SME))
1214 return 0;
1215
1216 bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
1217 local->hw.conf.channel->center_freq,
1218 ifmgd->ssid, ifmgd->ssid_len);
1219 if (!bss)
1220 return 0;
1221
1222 bss_privacy = !!(bss->cbss.capability & WLAN_CAPABILITY_PRIVACY);
1223 wep_privacy = !!ieee80211_sta_wep_configured(sdata);
1224 privacy_invoked = !!(ifmgd->flags & IEEE80211_STA_PRIVACY_INVOKED);
1225
1226 ieee80211_rx_bss_put(local, bss);
1227
1228 if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
1229 return 0;
1230
1231 return 1;
1232 }
1233
1234 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata)
1235 {
1236 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1237 struct ieee80211_local *local = sdata->local;
1238
1239 ifmgd->assoc_tries++;
1240 if (ifmgd->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
1241 printk(KERN_DEBUG "%s: association with AP %pM"
1242 " timed out\n",
1243 sdata->dev->name, ifmgd->bssid);
1244 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1245 ieee80211_recalc_idle(local);
1246 cfg80211_send_assoc_timeout(sdata->dev, ifmgd->bssid);
1247 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
1248 sdata->local->hw.conf.channel->center_freq,
1249 ifmgd->ssid, ifmgd->ssid_len);
1250 /*
1251 * We might have a pending scan which had no chance to run yet
1252 * due to state == IEEE80211_STA_MLME_ASSOCIATE.
1253 * Hence, queue the STAs work again
1254 */
1255 queue_work(local->hw.workqueue, &ifmgd->work);
1256 return;
1257 }
1258
1259 ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE;
1260 printk(KERN_DEBUG "%s: associate with AP %pM\n",
1261 sdata->dev->name, ifmgd->bssid);
1262 if (ieee80211_privacy_mismatch(sdata)) {
1263 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
1264 "mixed-cell disabled - abort association\n", sdata->dev->name);
1265 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1266 ieee80211_recalc_idle(local);
1267 return;
1268 }
1269
1270 ieee80211_send_assoc(sdata);
1271
1272 mod_timer(&ifmgd->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
1273 }
1274
1275 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1276 struct ieee80211_hdr *hdr)
1277 {
1278 /*
1279 * We can postpone the mgd.timer whenever receiving unicast frames
1280 * from AP because we know that the connection is working both ways
1281 * at that time. But multicast frames (and hence also beacons) must
1282 * be ignored here, because we need to trigger the timer during
1283 * data idle periods for sending the periodical probe request to
1284 * the AP.
1285 */
1286 if (!is_multicast_ether_addr(hdr->addr1))
1287 mod_timer(&sdata->u.mgd.timer,
1288 jiffies + IEEE80211_MONITORING_INTERVAL);
1289 }
1290
1291 void ieee80211_beacon_loss_work(struct work_struct *work)
1292 {
1293 struct ieee80211_sub_if_data *sdata =
1294 container_of(work, struct ieee80211_sub_if_data,
1295 u.mgd.beacon_loss_work);
1296 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1297
1298 /*
1299 * The driver has already reported this event and we have
1300 * already sent a probe request. Maybe the AP died and the
1301 * driver keeps reporting until we disassociate... We have
1302 * to ignore that because otherwise we would continually
1303 * reset the timer and never check whether we received a
1304 * probe response!
1305 */
1306 if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL)
1307 return;
1308
1309 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1310 if (net_ratelimit()) {
1311 printk(KERN_DEBUG "%s: driver reports beacon loss from AP %pM "
1312 "- sending probe request\n", sdata->dev->name,
1313 sdata->u.mgd.bssid);
1314 }
1315 #endif
1316
1317 ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1318
1319 mutex_lock(&sdata->local->iflist_mtx);
1320 ieee80211_recalc_ps(sdata->local, -1);
1321 mutex_unlock(&sdata->local->iflist_mtx);
1322
1323 ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1324 ifmgd->ssid_len, NULL, 0);
1325
1326 mod_timer(&ifmgd->timer, jiffies + IEEE80211_PROBE_WAIT);
1327 }
1328
1329 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1330 {
1331 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1332
1333 queue_work(sdata->local->hw.workqueue,
1334 &sdata->u.mgd.beacon_loss_work);
1335 }
1336 EXPORT_SYMBOL(ieee80211_beacon_loss);
1337
1338 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata)
1339 {
1340 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1341 struct ieee80211_local *local = sdata->local;
1342 struct sta_info *sta;
1343 unsigned long last_rx;
1344 bool disassoc = false;
1345
1346 /* TODO: start monitoring current AP signal quality and number of
1347 * missed beacons. Scan other channels every now and then and search
1348 * for better APs. */
1349 /* TODO: remove expired BSSes */
1350
1351 ifmgd->state = IEEE80211_STA_MLME_ASSOCIATED;
1352
1353 rcu_read_lock();
1354
1355 sta = sta_info_get(local, ifmgd->bssid);
1356 if (!sta) {
1357 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
1358 sdata->dev->name, ifmgd->bssid);
1359 disassoc = true;
1360 rcu_read_unlock();
1361 goto out;
1362 }
1363
1364 last_rx = sta->last_rx;
1365 rcu_read_unlock();
1366
1367 if ((ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) &&
1368 time_after(jiffies, last_rx + IEEE80211_PROBE_WAIT)) {
1369 printk(KERN_DEBUG "%s: no probe response from AP %pM "
1370 "- disassociating\n",
1371 sdata->dev->name, ifmgd->bssid);
1372 disassoc = true;
1373 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1374 goto out;
1375 }
1376
1377 /*
1378 * Beacon filtering is only enabled with power save and then the
1379 * stack should not check for beacon loss.
1380 */
1381 if (!((local->hw.flags & IEEE80211_HW_BEACON_FILTER) &&
1382 (local->hw.conf.flags & IEEE80211_CONF_PS)) &&
1383 time_after(jiffies,
1384 ifmgd->last_beacon + IEEE80211_MONITORING_INTERVAL)) {
1385 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1386 if (net_ratelimit()) {
1387 printk(KERN_DEBUG "%s: beacon loss from AP %pM "
1388 "- sending probe request\n",
1389 sdata->dev->name, ifmgd->bssid);
1390 }
1391 #endif
1392 ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1393 mutex_lock(&local->iflist_mtx);
1394 ieee80211_recalc_ps(local, -1);
1395 mutex_unlock(&local->iflist_mtx);
1396 ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1397 ifmgd->ssid_len, NULL, 0);
1398 mod_timer(&ifmgd->timer, jiffies + IEEE80211_PROBE_WAIT);
1399 goto out;
1400 }
1401
1402 if (time_after(jiffies, last_rx + IEEE80211_PROBE_IDLE_TIME)) {
1403 ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1404 mutex_lock(&local->iflist_mtx);
1405 ieee80211_recalc_ps(local, -1);
1406 mutex_unlock(&local->iflist_mtx);
1407 ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1408 ifmgd->ssid_len, NULL, 0);
1409 }
1410
1411 out:
1412 if (!disassoc)
1413 mod_timer(&ifmgd->timer,
1414 jiffies + IEEE80211_MONITORING_INTERVAL);
1415 else
1416 ieee80211_set_disassoc(sdata, true, true,
1417 WLAN_REASON_PREV_AUTH_NOT_VALID);
1418 }
1419
1420
1421 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata)
1422 {
1423 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1424
1425 printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1426 ifmgd->flags |= IEEE80211_STA_AUTHENTICATED;
1427 if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
1428 /* Wait for SME to request association */
1429 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1430 ieee80211_recalc_idle(sdata->local);
1431 } else
1432 ieee80211_associate(sdata);
1433 }
1434
1435
1436 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1437 struct ieee80211_mgmt *mgmt,
1438 size_t len)
1439 {
1440 u8 *pos;
1441 struct ieee802_11_elems elems;
1442
1443 pos = mgmt->u.auth.variable;
1444 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1445 if (!elems.challenge)
1446 return;
1447 ieee80211_send_auth(sdata, 3, sdata->u.mgd.auth_alg,
1448 elems.challenge - 2, elems.challenge_len + 2,
1449 sdata->u.mgd.bssid, 1);
1450 sdata->u.mgd.auth_transaction = 4;
1451 }
1452
1453 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1454 struct ieee80211_mgmt *mgmt,
1455 size_t len)
1456 {
1457 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1458 u16 auth_alg, auth_transaction, status_code;
1459
1460 if (ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE)
1461 return;
1462
1463 if (len < 24 + 6)
1464 return;
1465
1466 if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
1467 return;
1468
1469 if (memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
1470 return;
1471
1472 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1473 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1474 status_code = le16_to_cpu(mgmt->u.auth.status_code);
1475
1476 if (auth_alg != ifmgd->auth_alg ||
1477 auth_transaction != ifmgd->auth_transaction)
1478 return;
1479
1480 if (status_code != WLAN_STATUS_SUCCESS) {
1481 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1482 u8 algs[3];
1483 const int num_algs = ARRAY_SIZE(algs);
1484 int i, pos;
1485 algs[0] = algs[1] = algs[2] = 0xff;
1486 if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1487 algs[0] = WLAN_AUTH_OPEN;
1488 if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1489 algs[1] = WLAN_AUTH_SHARED_KEY;
1490 if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1491 algs[2] = WLAN_AUTH_LEAP;
1492 if (ifmgd->auth_alg == WLAN_AUTH_OPEN)
1493 pos = 0;
1494 else if (ifmgd->auth_alg == WLAN_AUTH_SHARED_KEY)
1495 pos = 1;
1496 else
1497 pos = 2;
1498 for (i = 0; i < num_algs; i++) {
1499 pos++;
1500 if (pos >= num_algs)
1501 pos = 0;
1502 if (algs[pos] == ifmgd->auth_alg ||
1503 algs[pos] == 0xff)
1504 continue;
1505 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1506 !ieee80211_sta_wep_configured(sdata))
1507 continue;
1508 ifmgd->auth_alg = algs[pos];
1509 break;
1510 }
1511 }
1512 return;
1513 }
1514
1515 switch (ifmgd->auth_alg) {
1516 case WLAN_AUTH_OPEN:
1517 case WLAN_AUTH_LEAP:
1518 case WLAN_AUTH_FT:
1519 ieee80211_auth_completed(sdata);
1520 cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, len);
1521 break;
1522 case WLAN_AUTH_SHARED_KEY:
1523 if (ifmgd->auth_transaction == 4) {
1524 ieee80211_auth_completed(sdata);
1525 cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, len);
1526 } else
1527 ieee80211_auth_challenge(sdata, mgmt, len);
1528 break;
1529 }
1530 }
1531
1532
1533 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1534 struct ieee80211_mgmt *mgmt,
1535 size_t len)
1536 {
1537 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1538 u16 reason_code;
1539
1540 if (len < 24 + 2)
1541 return;
1542
1543 if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
1544 return;
1545
1546 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1547
1548 if (ifmgd->flags & IEEE80211_STA_AUTHENTICATED)
1549 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
1550 sdata->dev->name, reason_code);
1551
1552 if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
1553 (ifmgd->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1554 ifmgd->state == IEEE80211_STA_MLME_ASSOCIATE ||
1555 ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)) {
1556 ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1557 mod_timer(&ifmgd->timer, jiffies +
1558 IEEE80211_RETRY_AUTH_INTERVAL);
1559 }
1560
1561 ieee80211_set_disassoc(sdata, true, false, 0);
1562 ifmgd->flags &= ~IEEE80211_STA_AUTHENTICATED;
1563 cfg80211_send_deauth(sdata->dev, (u8 *) mgmt, len);
1564 }
1565
1566
1567 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1568 struct ieee80211_mgmt *mgmt,
1569 size_t len)
1570 {
1571 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1572 u16 reason_code;
1573
1574 if (len < 24 + 2)
1575 return;
1576
1577 if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
1578 return;
1579
1580 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1581
1582 if (ifmgd->flags & IEEE80211_STA_ASSOCIATED)
1583 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1584 sdata->dev->name, reason_code);
1585
1586 if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
1587 ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED) {
1588 ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE;
1589 mod_timer(&ifmgd->timer, jiffies +
1590 IEEE80211_RETRY_AUTH_INTERVAL);
1591 }
1592
1593 ieee80211_set_disassoc(sdata, false, false, reason_code);
1594 cfg80211_send_disassoc(sdata->dev, (u8 *) mgmt, len);
1595 }
1596
1597
1598 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1599 struct ieee80211_mgmt *mgmt,
1600 size_t len,
1601 int reassoc)
1602 {
1603 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1604 struct ieee80211_local *local = sdata->local;
1605 struct ieee80211_supported_band *sband;
1606 struct sta_info *sta;
1607 u32 rates, basic_rates;
1608 u16 capab_info, status_code, aid;
1609 struct ieee802_11_elems elems;
1610 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1611 u8 *pos;
1612 u32 changed = 0;
1613 int i, j;
1614 bool have_higher_than_11mbit = false, newsta = false;
1615 u16 ap_ht_cap_flags;
1616
1617 /* AssocResp and ReassocResp have identical structure, so process both
1618 * of them in this function. */
1619
1620 if (ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE)
1621 return;
1622
1623 if (len < 24 + 6)
1624 return;
1625
1626 if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
1627 return;
1628
1629 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1630 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1631 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1632
1633 printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1634 "status=%d aid=%d)\n",
1635 sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1636 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1637
1638 pos = mgmt->u.assoc_resp.variable;
1639 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1640
1641 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1642 elems.timeout_int && elems.timeout_int_len == 5 &&
1643 elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1644 u32 tu, ms;
1645 tu = get_unaligned_le32(elems.timeout_int + 1);
1646 ms = tu * 1024 / 1000;
1647 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1648 "comeback duration %u TU (%u ms)\n",
1649 sdata->dev->name, tu, ms);
1650 if (ms > IEEE80211_ASSOC_TIMEOUT)
1651 mod_timer(&ifmgd->timer,
1652 jiffies + msecs_to_jiffies(ms));
1653 return;
1654 }
1655
1656 if (status_code != WLAN_STATUS_SUCCESS) {
1657 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1658 sdata->dev->name, status_code);
1659 /* if this was a reassociation, ensure we try a "full"
1660 * association next time. This works around some broken APs
1661 * which do not correctly reject reassociation requests. */
1662 ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1663 cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, len);
1664 if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
1665 /* Wait for SME to decide what to do next */
1666 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1667 ieee80211_recalc_idle(local);
1668 }
1669 return;
1670 }
1671
1672 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1673 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1674 "set\n", sdata->dev->name, aid);
1675 aid &= ~(BIT(15) | BIT(14));
1676
1677 if (!elems.supp_rates) {
1678 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1679 sdata->dev->name);
1680 return;
1681 }
1682
1683 printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1684 ifmgd->aid = aid;
1685 ifmgd->ap_capab = capab_info;
1686
1687 kfree(ifmgd->assocresp_ies);
1688 ifmgd->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1689 ifmgd->assocresp_ies = kmalloc(ifmgd->assocresp_ies_len, GFP_KERNEL);
1690 if (ifmgd->assocresp_ies)
1691 memcpy(ifmgd->assocresp_ies, pos, ifmgd->assocresp_ies_len);
1692
1693 rcu_read_lock();
1694
1695 /* Add STA entry for the AP */
1696 sta = sta_info_get(local, ifmgd->bssid);
1697 if (!sta) {
1698 newsta = true;
1699
1700 sta = sta_info_alloc(sdata, ifmgd->bssid, GFP_ATOMIC);
1701 if (!sta) {
1702 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1703 " the AP\n", sdata->dev->name);
1704 rcu_read_unlock();
1705 return;
1706 }
1707
1708 /* update new sta with its last rx activity */
1709 sta->last_rx = jiffies;
1710 }
1711
1712 /*
1713 * FIXME: Do we really need to update the sta_info's information here?
1714 * We already know about the AP (we found it in our list) so it
1715 * should already be filled with the right info, no?
1716 * As is stands, all this is racy because typically we assume
1717 * the information that is filled in here (except flags) doesn't
1718 * change while a STA structure is alive. As such, it should move
1719 * to between the sta_info_alloc() and sta_info_insert() above.
1720 */
1721
1722 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP);
1723 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1724 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1725
1726 rates = 0;
1727 basic_rates = 0;
1728 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1729
1730 for (i = 0; i < elems.supp_rates_len; i++) {
1731 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1732 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1733
1734 if (rate > 110)
1735 have_higher_than_11mbit = true;
1736
1737 for (j = 0; j < sband->n_bitrates; j++) {
1738 if (sband->bitrates[j].bitrate == rate) {
1739 rates |= BIT(j);
1740 if (is_basic)
1741 basic_rates |= BIT(j);
1742 break;
1743 }
1744 }
1745 }
1746
1747 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1748 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1749 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1750
1751 if (rate > 110)
1752 have_higher_than_11mbit = true;
1753
1754 for (j = 0; j < sband->n_bitrates; j++) {
1755 if (sband->bitrates[j].bitrate == rate) {
1756 rates |= BIT(j);
1757 if (is_basic)
1758 basic_rates |= BIT(j);
1759 break;
1760 }
1761 }
1762 }
1763
1764 sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1765 sdata->vif.bss_conf.basic_rates = basic_rates;
1766
1767 /* cf. IEEE 802.11 9.2.12 */
1768 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1769 have_higher_than_11mbit)
1770 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1771 else
1772 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1773
1774 /* If TKIP/WEP is used, no need to parse AP's HT capabilities */
1775 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))
1776 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1777 elems.ht_cap_elem, &sta->sta.ht_cap);
1778
1779 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1780
1781 rate_control_rate_init(sta);
1782
1783 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1784 set_sta_flags(sta, WLAN_STA_MFP);
1785
1786 if (elems.wmm_param)
1787 set_sta_flags(sta, WLAN_STA_WME);
1788
1789 if (newsta) {
1790 int err = sta_info_insert(sta);
1791 if (err) {
1792 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1793 " the AP (error %d)\n", sdata->dev->name, err);
1794 rcu_read_unlock();
1795 return;
1796 }
1797 }
1798
1799 rcu_read_unlock();
1800
1801 if (elems.wmm_param)
1802 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1803 elems.wmm_param_len);
1804 else
1805 ieee80211_set_wmm_default(sdata);
1806
1807 if (elems.ht_info_elem && elems.wmm_param &&
1808 (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
1809 !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))
1810 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1811 ap_ht_cap_flags);
1812
1813 /* set AID and assoc capability,
1814 * ieee80211_set_associated() will tell the driver */
1815 bss_conf->aid = aid;
1816 bss_conf->assoc_capability = capab_info;
1817 ieee80211_set_associated(sdata, changed);
1818
1819 /*
1820 * initialise the time of last beacon to be the association time,
1821 * otherwise beacon loss check will trigger immediately
1822 */
1823 ifmgd->last_beacon = jiffies;
1824
1825 ieee80211_associated(sdata);
1826 cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, len);
1827 }
1828
1829
1830 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1831 struct ieee80211_mgmt *mgmt,
1832 size_t len,
1833 struct ieee80211_rx_status *rx_status,
1834 struct ieee802_11_elems *elems,
1835 bool beacon)
1836 {
1837 struct ieee80211_local *local = sdata->local;
1838 int freq;
1839 struct ieee80211_bss *bss;
1840 struct ieee80211_channel *channel;
1841
1842 if (elems->ds_params && elems->ds_params_len == 1)
1843 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1844 else
1845 freq = rx_status->freq;
1846
1847 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1848
1849 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1850 return;
1851
1852 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1853 channel, beacon);
1854 if (!bss)
1855 return;
1856
1857 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1858 (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN) == 0)) {
1859 struct ieee80211_channel_sw_ie *sw_elem =
1860 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1861 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1862 }
1863
1864 ieee80211_rx_bss_put(local, bss);
1865 }
1866
1867
1868 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1869 struct ieee80211_mgmt *mgmt,
1870 size_t len,
1871 struct ieee80211_rx_status *rx_status)
1872 {
1873 struct ieee80211_if_managed *ifmgd;
1874 size_t baselen;
1875 struct ieee802_11_elems elems;
1876
1877 ifmgd = &sdata->u.mgd;
1878
1879 if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1880 return; /* ignore ProbeResp to foreign address */
1881
1882 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1883 if (baselen > len)
1884 return;
1885
1886 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1887 &elems);
1888
1889 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1890
1891 /* direct probe may be part of the association flow */
1892 if (ifmgd->state == IEEE80211_STA_MLME_DIRECT_PROBE) {
1893 printk(KERN_DEBUG "%s direct probe responded\n",
1894 sdata->dev->name);
1895 ieee80211_authenticate(sdata);
1896 }
1897
1898 if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) {
1899 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1900 mutex_lock(&sdata->local->iflist_mtx);
1901 ieee80211_recalc_ps(sdata->local, -1);
1902 mutex_unlock(&sdata->local->iflist_mtx);
1903 }
1904 }
1905
1906 /*
1907 * This is the canonical list of information elements we care about,
1908 * the filter code also gives us all changes to the Microsoft OUI
1909 * (00:50:F2) vendor IE which is used for WMM which we need to track.
1910 *
1911 * We implement beacon filtering in software since that means we can
1912 * avoid processing the frame here and in cfg80211, and userspace
1913 * will not be able to tell whether the hardware supports it or not.
1914 *
1915 * XXX: This list needs to be dynamic -- userspace needs to be able to
1916 * add items it requires. It also needs to be able to tell us to
1917 * look out for other vendor IEs.
1918 */
1919 static const u64 care_about_ies =
1920 (1ULL << WLAN_EID_COUNTRY) |
1921 (1ULL << WLAN_EID_ERP_INFO) |
1922 (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1923 (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1924 (1ULL << WLAN_EID_HT_CAPABILITY) |
1925 (1ULL << WLAN_EID_HT_INFORMATION);
1926
1927 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1928 struct ieee80211_mgmt *mgmt,
1929 size_t len,
1930 struct ieee80211_rx_status *rx_status)
1931 {
1932 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1933 size_t baselen;
1934 struct ieee802_11_elems elems;
1935 struct ieee80211_local *local = sdata->local;
1936 u32 changed = 0;
1937 bool erp_valid, directed_tim = false;
1938 u8 erp_value = 0;
1939 u32 ncrc;
1940
1941 /* Process beacon from the current BSS */
1942 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1943 if (baselen > len)
1944 return;
1945
1946 if (rx_status->freq != local->hw.conf.channel->center_freq)
1947 return;
1948
1949 if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED) ||
1950 memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
1951 return;
1952
1953 if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) {
1954 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1955 if (net_ratelimit()) {
1956 printk(KERN_DEBUG "%s: cancelling probereq poll due "
1957 "to a received beacon\n", sdata->dev->name);
1958 }
1959 #endif
1960 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1961 mutex_lock(&local->iflist_mtx);
1962 ieee80211_recalc_ps(local, -1);
1963 mutex_unlock(&local->iflist_mtx);
1964 }
1965
1966 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1967 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1968 len - baselen, &elems,
1969 care_about_ies, ncrc);
1970
1971 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1972 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1973 ifmgd->aid);
1974
1975 if (ncrc != ifmgd->beacon_crc) {
1976 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1977 true);
1978
1979 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1980 elems.wmm_param_len);
1981 }
1982
1983 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1984 if (directed_tim) {
1985 if (local->hw.conf.dynamic_ps_timeout > 0) {
1986 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1987 ieee80211_hw_config(local,
1988 IEEE80211_CONF_CHANGE_PS);
1989 ieee80211_send_nullfunc(local, sdata, 0);
1990 } else {
1991 local->pspolling = true;
1992
1993 /*
1994 * Here is assumed that the driver will be
1995 * able to send ps-poll frame and receive a
1996 * response even though power save mode is
1997 * enabled, but some drivers might require
1998 * to disable power save here. This needs
1999 * to be investigated.
2000 */
2001 ieee80211_send_pspoll(local, sdata);
2002 }
2003 }
2004 }
2005
2006 if (ncrc == ifmgd->beacon_crc)
2007 return;
2008 ifmgd->beacon_crc = ncrc;
2009
2010 if (elems.erp_info && elems.erp_info_len >= 1) {
2011 erp_valid = true;
2012 erp_value = elems.erp_info[0];
2013 } else {
2014 erp_valid = false;
2015 }
2016 changed |= ieee80211_handle_bss_capability(sdata,
2017 le16_to_cpu(mgmt->u.beacon.capab_info),
2018 erp_valid, erp_value);
2019
2020
2021 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
2022 !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED)) {
2023 struct sta_info *sta;
2024 struct ieee80211_supported_band *sband;
2025 u16 ap_ht_cap_flags;
2026
2027 rcu_read_lock();
2028
2029 sta = sta_info_get(local, ifmgd->bssid);
2030 if (!sta) {
2031 rcu_read_unlock();
2032 return;
2033 }
2034
2035 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2036
2037 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
2038 elems.ht_cap_elem, &sta->sta.ht_cap);
2039
2040 ap_ht_cap_flags = sta->sta.ht_cap.cap;
2041
2042 rcu_read_unlock();
2043
2044 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
2045 ap_ht_cap_flags);
2046 }
2047
2048 if (elems.country_elem) {
2049 /* Note we are only reviewing this on beacons
2050 * for the BSSID we are associated to */
2051 regulatory_hint_11d(local->hw.wiphy,
2052 elems.country_elem, elems.country_elem_len);
2053
2054 /* TODO: IBSS also needs this */
2055 if (elems.pwr_constr_elem)
2056 ieee80211_handle_pwr_constr(sdata,
2057 le16_to_cpu(mgmt->u.probe_resp.capab_info),
2058 elems.pwr_constr_elem,
2059 elems.pwr_constr_elem_len);
2060 }
2061
2062 ieee80211_bss_info_change_notify(sdata, changed);
2063 }
2064
2065 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
2066 struct sk_buff *skb,
2067 struct ieee80211_rx_status *rx_status)
2068 {
2069 struct ieee80211_local *local = sdata->local;
2070 struct ieee80211_mgmt *mgmt;
2071 u16 fc;
2072
2073 if (skb->len < 24)
2074 return RX_DROP_MONITOR;
2075
2076 mgmt = (struct ieee80211_mgmt *) skb->data;
2077 fc = le16_to_cpu(mgmt->frame_control);
2078
2079 switch (fc & IEEE80211_FCTL_STYPE) {
2080 case IEEE80211_STYPE_PROBE_REQ:
2081 case IEEE80211_STYPE_PROBE_RESP:
2082 case IEEE80211_STYPE_BEACON:
2083 memcpy(skb->cb, rx_status, sizeof(*rx_status));
2084 case IEEE80211_STYPE_AUTH:
2085 case IEEE80211_STYPE_ASSOC_RESP:
2086 case IEEE80211_STYPE_REASSOC_RESP:
2087 case IEEE80211_STYPE_DEAUTH:
2088 case IEEE80211_STYPE_DISASSOC:
2089 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
2090 queue_work(local->hw.workqueue, &sdata->u.mgd.work);
2091 return RX_QUEUED;
2092 }
2093
2094 return RX_DROP_MONITOR;
2095 }
2096
2097 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2098 struct sk_buff *skb)
2099 {
2100 struct ieee80211_rx_status *rx_status;
2101 struct ieee80211_mgmt *mgmt;
2102 u16 fc;
2103
2104 rx_status = (struct ieee80211_rx_status *) skb->cb;
2105 mgmt = (struct ieee80211_mgmt *) skb->data;
2106 fc = le16_to_cpu(mgmt->frame_control);
2107
2108 switch (fc & IEEE80211_FCTL_STYPE) {
2109 case IEEE80211_STYPE_PROBE_RESP:
2110 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
2111 rx_status);
2112 break;
2113 case IEEE80211_STYPE_BEACON:
2114 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
2115 rx_status);
2116 break;
2117 case IEEE80211_STYPE_AUTH:
2118 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
2119 break;
2120 case IEEE80211_STYPE_ASSOC_RESP:
2121 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 0);
2122 break;
2123 case IEEE80211_STYPE_REASSOC_RESP:
2124 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 1);
2125 break;
2126 case IEEE80211_STYPE_DEAUTH:
2127 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
2128 break;
2129 case IEEE80211_STYPE_DISASSOC:
2130 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
2131 break;
2132 }
2133
2134 kfree_skb(skb);
2135 }
2136
2137 static void ieee80211_sta_timer(unsigned long data)
2138 {
2139 struct ieee80211_sub_if_data *sdata =
2140 (struct ieee80211_sub_if_data *) data;
2141 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2142 struct ieee80211_local *local = sdata->local;
2143
2144 if (local->quiescing) {
2145 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2146 return;
2147 }
2148
2149 set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
2150 queue_work(local->hw.workqueue, &ifmgd->work);
2151 }
2152
2153 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata)
2154 {
2155 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2156 struct ieee80211_local *local = sdata->local;
2157
2158 /* Reset own TSF to allow time synchronization work. */
2159 drv_reset_tsf(local);
2160
2161 ifmgd->wmm_last_param_set = -1; /* allow any WMM update */
2162
2163
2164 if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN)
2165 ifmgd->auth_alg = WLAN_AUTH_OPEN;
2166 else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
2167 ifmgd->auth_alg = WLAN_AUTH_SHARED_KEY;
2168 else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP)
2169 ifmgd->auth_alg = WLAN_AUTH_LEAP;
2170 else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_FT)
2171 ifmgd->auth_alg = WLAN_AUTH_FT;
2172 else
2173 ifmgd->auth_alg = WLAN_AUTH_OPEN;
2174 ifmgd->auth_transaction = -1;
2175 ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
2176 ifmgd->assoc_scan_tries = 0;
2177 ifmgd->direct_probe_tries = 0;
2178 ifmgd->auth_tries = 0;
2179 ifmgd->assoc_tries = 0;
2180 netif_tx_stop_all_queues(sdata->dev);
2181 netif_carrier_off(sdata->dev);
2182 }
2183
2184 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata)
2185 {
2186 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2187 struct ieee80211_local *local = sdata->local;
2188 struct ieee80211_bss *bss;
2189 u8 *bssid = ifmgd->bssid, *ssid = ifmgd->ssid;
2190 u8 ssid_len = ifmgd->ssid_len;
2191 u16 capa_mask = WLAN_CAPABILITY_ESS;
2192 u16 capa_val = WLAN_CAPABILITY_ESS;
2193 struct ieee80211_channel *chan = local->oper_channel;
2194
2195 if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
2196 ifmgd->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2197 IEEE80211_STA_AUTO_BSSID_SEL |
2198 IEEE80211_STA_AUTO_CHANNEL_SEL)) {
2199 capa_mask |= WLAN_CAPABILITY_PRIVACY;
2200 if (sdata->default_key)
2201 capa_val |= WLAN_CAPABILITY_PRIVACY;
2202 }
2203
2204 if (ifmgd->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2205 chan = NULL;
2206
2207 if (ifmgd->flags & IEEE80211_STA_AUTO_BSSID_SEL)
2208 bssid = NULL;
2209
2210 if (ifmgd->flags & IEEE80211_STA_AUTO_SSID_SEL) {
2211 ssid = NULL;
2212 ssid_len = 0;
2213 }
2214
2215 bss = (void *)cfg80211_get_bss(local->hw.wiphy, chan,
2216 bssid, ssid, ssid_len,
2217 capa_mask, capa_val);
2218
2219 if (bss) {
2220 local->oper_channel = bss->cbss.channel;
2221 local->oper_channel_type = NL80211_CHAN_NO_HT;
2222 ieee80211_hw_config(local, 0);
2223
2224 if (!(ifmgd->flags & IEEE80211_STA_SSID_SET))
2225 ieee80211_sta_set_ssid(sdata, bss->ssid,
2226 bss->ssid_len);
2227 ieee80211_sta_set_bssid(sdata, bss->cbss.bssid);
2228 ieee80211_sta_def_wmm_params(sdata, bss->supp_rates_len,
2229 bss->supp_rates);
2230 if (sdata->u.mgd.mfp == IEEE80211_MFP_REQUIRED)
2231 sdata->u.mgd.flags |= IEEE80211_STA_MFP_ENABLED;
2232 else
2233 sdata->u.mgd.flags &= ~IEEE80211_STA_MFP_ENABLED;
2234
2235 /* Send out direct probe if no probe resp was received or
2236 * the one we have is outdated
2237 */
2238 if (!bss->last_probe_resp ||
2239 time_after(jiffies, bss->last_probe_resp
2240 + IEEE80211_SCAN_RESULT_EXPIRE))
2241 ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2242 else
2243 ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
2244
2245 ieee80211_rx_bss_put(local, bss);
2246 ieee80211_sta_reset_auth(sdata);
2247 return 0;
2248 } else {
2249 if (ifmgd->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2250
2251 ifmgd->assoc_scan_tries++;
2252
2253 ieee80211_request_internal_scan(sdata, ifmgd->ssid,
2254 ssid_len);
2255
2256 ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
2257 set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
2258 } else {
2259 ifmgd->assoc_scan_tries = 0;
2260 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
2261 ieee80211_recalc_idle(local);
2262 }
2263 }
2264 return -1;
2265 }
2266
2267
2268 static void ieee80211_sta_work(struct work_struct *work)
2269 {
2270 struct ieee80211_sub_if_data *sdata =
2271 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
2272 struct ieee80211_local *local = sdata->local;
2273 struct ieee80211_if_managed *ifmgd;
2274 struct sk_buff *skb;
2275
2276 if (!netif_running(sdata->dev))
2277 return;
2278
2279 if (local->sw_scanning || local->hw_scanning)
2280 return;
2281
2282 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2283 return;
2284
2285 /*
2286 * Nothing should have been stuffed into the workqueue during
2287 * the suspend->resume cycle. If this WARN is seen then there
2288 * is a bug with either the driver suspend or something in
2289 * mac80211 stuffing into the workqueue which we haven't yet
2290 * cleared during mac80211's suspend cycle.
2291 */
2292 if (WARN_ON(local->suspended))
2293 return;
2294
2295 ifmgd = &sdata->u.mgd;
2296
2297 while ((skb = skb_dequeue(&ifmgd->skb_queue)))
2298 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2299
2300 if (ifmgd->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2301 ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2302 ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE &&
2303 test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request)) {
2304 queue_delayed_work(local->hw.workqueue, &local->scan_work,
2305 round_jiffies_relative(0));
2306 return;
2307 }
2308
2309 if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request)) {
2310 if (ieee80211_sta_config_auth(sdata))
2311 return;
2312 clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
2313 } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request))
2314 return;
2315
2316 ieee80211_recalc_idle(local);
2317
2318 switch (ifmgd->state) {
2319 case IEEE80211_STA_MLME_DISABLED:
2320 break;
2321 case IEEE80211_STA_MLME_DIRECT_PROBE:
2322 ieee80211_direct_probe(sdata);
2323 break;
2324 case IEEE80211_STA_MLME_AUTHENTICATE:
2325 ieee80211_authenticate(sdata);
2326 break;
2327 case IEEE80211_STA_MLME_ASSOCIATE:
2328 ieee80211_associate(sdata);
2329 break;
2330 case IEEE80211_STA_MLME_ASSOCIATED:
2331 ieee80211_associated(sdata);
2332 break;
2333 default:
2334 WARN_ON(1);
2335 break;
2336 }
2337
2338 if (ieee80211_privacy_mismatch(sdata)) {
2339 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2340 "mixed-cell disabled - disassociate\n", sdata->dev->name);
2341
2342 ieee80211_set_disassoc(sdata, false, true,
2343 WLAN_REASON_UNSPECIFIED);
2344 }
2345 }
2346
2347 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2348 {
2349 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2350 /*
2351 * Need to update last_beacon to avoid beacon loss
2352 * test to trigger.
2353 */
2354 sdata->u.mgd.last_beacon = jiffies;
2355
2356
2357 queue_work(sdata->local->hw.workqueue,
2358 &sdata->u.mgd.work);
2359 }
2360 }
2361
2362 #ifdef CONFIG_PM
2363 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2364 {
2365 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2366
2367 /*
2368 * we need to use atomic bitops for the running bits
2369 * only because both timers might fire at the same
2370 * time -- the code here is properly synchronised.
2371 */
2372
2373 cancel_work_sync(&ifmgd->work);
2374 cancel_work_sync(&ifmgd->beacon_loss_work);
2375 if (del_timer_sync(&ifmgd->timer))
2376 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2377
2378 cancel_work_sync(&ifmgd->chswitch_work);
2379 if (del_timer_sync(&ifmgd->chswitch_timer))
2380 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2381 }
2382
2383 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2384 {
2385 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2386
2387 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2388 add_timer(&ifmgd->timer);
2389 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2390 add_timer(&ifmgd->chswitch_timer);
2391 }
2392 #endif
2393
2394 /* interface setup */
2395 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2396 {
2397 struct ieee80211_if_managed *ifmgd;
2398 u32 hw_flags;
2399
2400 ifmgd = &sdata->u.mgd;
2401 INIT_WORK(&ifmgd->work, ieee80211_sta_work);
2402 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2403 INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
2404 setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2405 (unsigned long) sdata);
2406 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2407 (unsigned long) sdata);
2408 skb_queue_head_init(&ifmgd->skb_queue);
2409
2410 ifmgd->capab = WLAN_CAPABILITY_ESS;
2411 ifmgd->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2412 IEEE80211_AUTH_ALG_SHARED_KEY;
2413 ifmgd->flags |= IEEE80211_STA_CREATE_IBSS |
2414 IEEE80211_STA_AUTO_BSSID_SEL |
2415 IEEE80211_STA_AUTO_CHANNEL_SEL;
2416 if (sdata->local->hw.queues >= 4)
2417 ifmgd->flags |= IEEE80211_STA_WMM_ENABLED;
2418
2419 hw_flags = sdata->local->hw.flags;
2420
2421 if (hw_flags & IEEE80211_HW_SUPPORTS_PS) {
2422 ifmgd->powersave = CONFIG_MAC80211_DEFAULT_PS_VALUE;
2423 sdata->local->hw.conf.dynamic_ps_timeout = 500;
2424 }
2425 }
2426
2427 /* configuration hooks */
2428 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata)
2429 {
2430 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2431 struct ieee80211_local *local = sdata->local;
2432
2433 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2434 return;
2435
2436 if ((ifmgd->flags & (IEEE80211_STA_BSSID_SET |
2437 IEEE80211_STA_AUTO_BSSID_SEL)) &&
2438 (ifmgd->flags & (IEEE80211_STA_SSID_SET |
2439 IEEE80211_STA_AUTO_SSID_SEL))) {
2440
2441 if (ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)
2442 ieee80211_set_disassoc(sdata, true, true,
2443 WLAN_REASON_DEAUTH_LEAVING);
2444
2445 if (ifmgd->ssid_len == 0) {
2446 /*
2447 * Only allow association to be started if a valid SSID
2448 * is configured.
2449 */
2450 return;
2451 }
2452
2453 if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) ||
2454 ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE)
2455 set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
2456 else if (ifmgd->flags & IEEE80211_STA_EXT_SME)
2457 set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
2458 queue_work(local->hw.workqueue, &ifmgd->work);
2459 }
2460 }
2461
2462 int ieee80211_sta_commit(struct ieee80211_sub_if_data *sdata)
2463 {
2464 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2465
2466 if (ifmgd->ssid_len)
2467 ifmgd->flags |= IEEE80211_STA_SSID_SET;
2468 else
2469 ifmgd->flags &= ~IEEE80211_STA_SSID_SET;
2470
2471 return 0;
2472 }
2473
2474 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2475 {
2476 struct ieee80211_if_managed *ifmgd;
2477
2478 if (len > IEEE80211_MAX_SSID_LEN)
2479 return -EINVAL;
2480
2481 ifmgd = &sdata->u.mgd;
2482
2483 if (ifmgd->ssid_len != len || memcmp(ifmgd->ssid, ssid, len) != 0) {
2484 if (ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)
2485 ieee80211_set_disassoc(sdata, true, true,
2486 WLAN_REASON_DEAUTH_LEAVING);
2487
2488 /*
2489 * Do not use reassociation if SSID is changed (different ESS).
2490 */
2491 ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2492 memset(ifmgd->ssid, 0, sizeof(ifmgd->ssid));
2493 memcpy(ifmgd->ssid, ssid, len);
2494 ifmgd->ssid_len = len;
2495 }
2496
2497 return ieee80211_sta_commit(sdata);
2498 }
2499
2500 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2501 {
2502 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2503 memcpy(ssid, ifmgd->ssid, ifmgd->ssid_len);
2504 *len = ifmgd->ssid_len;
2505 return 0;
2506 }
2507
2508 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2509 {
2510 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2511
2512 if (compare_ether_addr(bssid, ifmgd->bssid) != 0 &&
2513 ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)
2514 ieee80211_set_disassoc(sdata, true, true,
2515 WLAN_REASON_DEAUTH_LEAVING);
2516
2517 if (is_valid_ether_addr(bssid)) {
2518 memcpy(ifmgd->bssid, bssid, ETH_ALEN);
2519 ifmgd->flags |= IEEE80211_STA_BSSID_SET;
2520 } else {
2521 memset(ifmgd->bssid, 0, ETH_ALEN);
2522 ifmgd->flags &= ~IEEE80211_STA_BSSID_SET;
2523 }
2524
2525 return ieee80211_sta_commit(sdata);
2526 }
2527
2528 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata,
2529 const char *ie, size_t len)
2530 {
2531 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2532
2533 if (len == 0 && ifmgd->extra_ie_len == 0)
2534 return -EALREADY;
2535
2536 if (len == ifmgd->extra_ie_len && ifmgd->extra_ie &&
2537 memcmp(ifmgd->extra_ie, ie, len) == 0)
2538 return -EALREADY;
2539
2540 kfree(ifmgd->extra_ie);
2541 if (len == 0) {
2542 ifmgd->extra_ie = NULL;
2543 ifmgd->extra_ie_len = 0;
2544 return 0;
2545 }
2546 ifmgd->extra_ie = kmalloc(len, GFP_KERNEL);
2547 if (!ifmgd->extra_ie) {
2548 ifmgd->extra_ie_len = 0;
2549 return -ENOMEM;
2550 }
2551 memcpy(ifmgd->extra_ie, ie, len);
2552 ifmgd->extra_ie_len = len;
2553 return 0;
2554 }
2555
2556 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2557 {
2558 printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2559 sdata->dev->name, reason);
2560
2561 ieee80211_set_disassoc(sdata, true, true, reason);
2562 return 0;
2563 }
2564
2565 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2566 {
2567 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2568
2569 printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2570 sdata->dev->name, reason);
2571
2572 if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED))
2573 return -ENOLINK;
2574
2575 ieee80211_set_disassoc(sdata, false, true, reason);
2576 return 0;
2577 }
2578
2579 /* scan finished notification */
2580 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2581 {
2582 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2583
2584 /* Restart STA timers */
2585 rcu_read_lock();
2586 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2587 ieee80211_restart_sta_timer(sdata);
2588 rcu_read_unlock();
2589 }
2590
2591 int ieee80211_max_network_latency(struct notifier_block *nb,
2592 unsigned long data, void *dummy)
2593 {
2594 s32 latency_usec = (s32) data;
2595 struct ieee80211_local *local =
2596 container_of(nb, struct ieee80211_local,
2597 network_latency_notifier);
2598
2599 mutex_lock(&local->iflist_mtx);
2600 ieee80211_recalc_ps(local, latency_usec);
2601 mutex_unlock(&local->iflist_mtx);
2602
2603 return 0;
2604 }
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