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[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 <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 int ieee80211_compatible_rates(struct ieee80211_bss *bss,
50 struct ieee80211_supported_band *sband,
51 u32 *rates)
52 {
53 int i, j, count;
54 *rates = 0;
55 count = 0;
56 for (i = 0; i < bss->supp_rates_len; i++) {
57 int rate = (bss->supp_rates[i] & 0x7F) * 5;
58
59 for (j = 0; j < sband->n_bitrates; j++)
60 if (sband->bitrates[j].bitrate == rate) {
61 *rates |= BIT(j);
62 count++;
63 break;
64 }
65 }
66
67 return count;
68 }
69
70 /*
71 * ieee80211_enable_ht should be called only after the operating band
72 * has been determined as ht configuration depends on the hw's
73 * HT abilities for a specific band.
74 */
75 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
76 struct ieee80211_ht_info *hti,
77 u16 ap_ht_cap_flags)
78 {
79 struct ieee80211_local *local = sdata->local;
80 struct ieee80211_supported_band *sband;
81 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
82 struct sta_info *sta;
83 u32 changed = 0;
84 u16 ht_opmode;
85 bool enable_ht = true, ht_changed;
86 enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
87
88 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
89
90 /* HT is not supported */
91 if (!sband->ht_cap.ht_supported)
92 enable_ht = false;
93
94 /* check that channel matches the right operating channel */
95 if (local->hw.conf.channel->center_freq !=
96 ieee80211_channel_to_frequency(hti->control_chan))
97 enable_ht = false;
98
99 if (enable_ht) {
100 channel_type = NL80211_CHAN_HT20;
101
102 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
103 (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
104 (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
105 switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
106 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
107 if (!(local->hw.conf.channel->flags &
108 IEEE80211_CHAN_NO_HT40PLUS))
109 channel_type = NL80211_CHAN_HT40PLUS;
110 break;
111 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
112 if (!(local->hw.conf.channel->flags &
113 IEEE80211_CHAN_NO_HT40MINUS))
114 channel_type = NL80211_CHAN_HT40MINUS;
115 break;
116 }
117 }
118 }
119
120 ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
121 channel_type != local->hw.conf.channel_type;
122
123 local->oper_channel_type = channel_type;
124
125 if (ht_changed) {
126 /* channel_type change automatically detected */
127 ieee80211_hw_config(local, 0);
128
129 rcu_read_lock();
130
131 sta = sta_info_get(local, ifmgd->bssid);
132 if (sta)
133 rate_control_rate_update(local, sband, sta,
134 IEEE80211_RC_HT_CHANGED);
135
136 rcu_read_unlock();
137 }
138
139 /* disable HT */
140 if (!enable_ht)
141 return 0;
142
143 ht_opmode = le16_to_cpu(hti->operation_mode);
144
145 /* if bss configuration changed store the new one */
146 if (!sdata->ht_opmode_valid ||
147 sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
148 changed |= BSS_CHANGED_HT;
149 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
150 sdata->ht_opmode_valid = true;
151 }
152
153 return changed;
154 }
155
156 /* frame sending functions */
157
158 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
159 {
160 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
161 struct ieee80211_local *local = sdata->local;
162 struct sk_buff *skb;
163 struct ieee80211_mgmt *mgmt;
164 u8 *pos;
165 const u8 *ies, *ht_ie;
166 int i, len, count, rates_len, supp_rates_len;
167 u16 capab;
168 struct ieee80211_bss *bss;
169 int wmm = 0;
170 struct ieee80211_supported_band *sband;
171 u32 rates = 0;
172
173 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
174 sizeof(*mgmt) + 200 + ifmgd->extra_ie_len +
175 ifmgd->ssid_len);
176 if (!skb) {
177 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
178 "frame\n", sdata->dev->name);
179 return;
180 }
181 skb_reserve(skb, local->hw.extra_tx_headroom);
182
183 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
184
185 capab = ifmgd->capab;
186
187 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
188 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
189 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
190 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
191 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
192 }
193
194 bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
195 local->hw.conf.channel->center_freq,
196 ifmgd->ssid, ifmgd->ssid_len);
197 if (bss) {
198 if (bss->cbss.capability & WLAN_CAPABILITY_PRIVACY)
199 capab |= WLAN_CAPABILITY_PRIVACY;
200 if (bss->wmm_used)
201 wmm = 1;
202
203 /* get all rates supported by the device and the AP as
204 * some APs don't like getting a superset of their rates
205 * in the association request (e.g. D-Link DAP 1353 in
206 * b-only mode) */
207 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
208
209 if ((bss->cbss.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
210 (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
211 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
212
213 ieee80211_rx_bss_put(local, bss);
214 } else {
215 rates = ~0;
216 rates_len = sband->n_bitrates;
217 }
218
219 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
220 memset(mgmt, 0, 24);
221 memcpy(mgmt->da, ifmgd->bssid, ETH_ALEN);
222 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
223 memcpy(mgmt->bssid, ifmgd->bssid, ETH_ALEN);
224
225 if (ifmgd->flags & IEEE80211_STA_PREV_BSSID_SET) {
226 skb_put(skb, 10);
227 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
228 IEEE80211_STYPE_REASSOC_REQ);
229 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
230 mgmt->u.reassoc_req.listen_interval =
231 cpu_to_le16(local->hw.conf.listen_interval);
232 memcpy(mgmt->u.reassoc_req.current_ap, ifmgd->prev_bssid,
233 ETH_ALEN);
234 } else {
235 skb_put(skb, 4);
236 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
237 IEEE80211_STYPE_ASSOC_REQ);
238 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
239 mgmt->u.assoc_req.listen_interval =
240 cpu_to_le16(local->hw.conf.listen_interval);
241 }
242
243 /* SSID */
244 ies = pos = skb_put(skb, 2 + ifmgd->ssid_len);
245 *pos++ = WLAN_EID_SSID;
246 *pos++ = ifmgd->ssid_len;
247 memcpy(pos, ifmgd->ssid, ifmgd->ssid_len);
248
249 /* add all rates which were marked to be used above */
250 supp_rates_len = rates_len;
251 if (supp_rates_len > 8)
252 supp_rates_len = 8;
253
254 len = sband->n_bitrates;
255 pos = skb_put(skb, supp_rates_len + 2);
256 *pos++ = WLAN_EID_SUPP_RATES;
257 *pos++ = supp_rates_len;
258
259 count = 0;
260 for (i = 0; i < sband->n_bitrates; i++) {
261 if (BIT(i) & rates) {
262 int rate = sband->bitrates[i].bitrate;
263 *pos++ = (u8) (rate / 5);
264 if (++count == 8)
265 break;
266 }
267 }
268
269 if (rates_len > count) {
270 pos = skb_put(skb, rates_len - count + 2);
271 *pos++ = WLAN_EID_EXT_SUPP_RATES;
272 *pos++ = rates_len - count;
273
274 for (i++; i < sband->n_bitrates; i++) {
275 if (BIT(i) & rates) {
276 int rate = sband->bitrates[i].bitrate;
277 *pos++ = (u8) (rate / 5);
278 }
279 }
280 }
281
282 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
283 /* 1. power capabilities */
284 pos = skb_put(skb, 4);
285 *pos++ = WLAN_EID_PWR_CAPABILITY;
286 *pos++ = 2;
287 *pos++ = 0; /* min tx power */
288 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
289
290 /* 2. supported channels */
291 /* TODO: get this in reg domain format */
292 pos = skb_put(skb, 2 * sband->n_channels + 2);
293 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
294 *pos++ = 2 * sband->n_channels;
295 for (i = 0; i < sband->n_channels; i++) {
296 *pos++ = ieee80211_frequency_to_channel(
297 sband->channels[i].center_freq);
298 *pos++ = 1; /* one channel in the subband*/
299 }
300 }
301
302 if (ifmgd->extra_ie) {
303 pos = skb_put(skb, ifmgd->extra_ie_len);
304 memcpy(pos, ifmgd->extra_ie, ifmgd->extra_ie_len);
305 }
306
307 if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED)) {
308 pos = skb_put(skb, 9);
309 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
310 *pos++ = 7; /* len */
311 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
312 *pos++ = 0x50;
313 *pos++ = 0xf2;
314 *pos++ = 2; /* WME */
315 *pos++ = 0; /* WME info */
316 *pos++ = 1; /* WME ver */
317 *pos++ = 0;
318 }
319
320 /* wmm support is a must to HT */
321 /*
322 * IEEE802.11n does not allow TKIP/WEP as pairwise
323 * ciphers in HT mode. We still associate in non-ht
324 * mode (11a/b/g) if any one of these ciphers is
325 * configured as pairwise.
326 */
327 if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
328 sband->ht_cap.ht_supported &&
329 (ht_ie = ieee80211_bss_get_ie(&bss->cbss, WLAN_EID_HT_INFORMATION)) &&
330 ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
331 (!(ifmgd->flags & IEEE80211_STA_DISABLE_11N))) {
332 struct ieee80211_ht_info *ht_info =
333 (struct ieee80211_ht_info *)(ht_ie + 2);
334 u16 cap = sband->ht_cap.cap;
335 __le16 tmp;
336 u32 flags = local->hw.conf.channel->flags;
337
338 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
339 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
340 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
341 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
342 cap &= ~IEEE80211_HT_CAP_SGI_40;
343 }
344 break;
345 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
346 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
347 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
348 cap &= ~IEEE80211_HT_CAP_SGI_40;
349 }
350 break;
351 }
352
353 tmp = cpu_to_le16(cap);
354 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
355 *pos++ = WLAN_EID_HT_CAPABILITY;
356 *pos++ = sizeof(struct ieee80211_ht_cap);
357 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
358 memcpy(pos, &tmp, sizeof(u16));
359 pos += sizeof(u16);
360 /* TODO: needs a define here for << 2 */
361 *pos++ = sband->ht_cap.ampdu_factor |
362 (sband->ht_cap.ampdu_density << 2);
363 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
364 }
365
366 kfree(ifmgd->assocreq_ies);
367 ifmgd->assocreq_ies_len = (skb->data + skb->len) - ies;
368 ifmgd->assocreq_ies = kmalloc(ifmgd->assocreq_ies_len, GFP_KERNEL);
369 if (ifmgd->assocreq_ies)
370 memcpy(ifmgd->assocreq_ies, ies, ifmgd->assocreq_ies_len);
371
372 ieee80211_tx_skb(sdata, skb, 0);
373 }
374
375
376 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
377 u16 stype, u16 reason)
378 {
379 struct ieee80211_local *local = sdata->local;
380 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
381 struct sk_buff *skb;
382 struct ieee80211_mgmt *mgmt;
383
384 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
385 if (!skb) {
386 printk(KERN_DEBUG "%s: failed to allocate buffer for "
387 "deauth/disassoc frame\n", sdata->dev->name);
388 return;
389 }
390 skb_reserve(skb, local->hw.extra_tx_headroom);
391
392 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
393 memset(mgmt, 0, 24);
394 memcpy(mgmt->da, ifmgd->bssid, ETH_ALEN);
395 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
396 memcpy(mgmt->bssid, ifmgd->bssid, ETH_ALEN);
397 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
398 skb_put(skb, 2);
399 /* u.deauth.reason_code == u.disassoc.reason_code */
400 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
401
402 if (stype == IEEE80211_STYPE_DEAUTH)
403 cfg80211_send_deauth(sdata->dev, (u8 *) mgmt, skb->len,
404 GFP_KERNEL);
405 else
406 cfg80211_send_disassoc(sdata->dev, (u8 *) mgmt, skb->len,
407 GFP_KERNEL);
408 ieee80211_tx_skb(sdata, skb, ifmgd->flags & IEEE80211_STA_MFP_ENABLED);
409 }
410
411 void ieee80211_send_pspoll(struct ieee80211_local *local,
412 struct ieee80211_sub_if_data *sdata)
413 {
414 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
415 struct ieee80211_pspoll *pspoll;
416 struct sk_buff *skb;
417 u16 fc;
418
419 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
420 if (!skb) {
421 printk(KERN_DEBUG "%s: failed to allocate buffer for "
422 "pspoll frame\n", sdata->dev->name);
423 return;
424 }
425 skb_reserve(skb, local->hw.extra_tx_headroom);
426
427 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
428 memset(pspoll, 0, sizeof(*pspoll));
429 fc = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL | IEEE80211_FCTL_PM;
430 pspoll->frame_control = cpu_to_le16(fc);
431 pspoll->aid = cpu_to_le16(ifmgd->aid);
432
433 /* aid in PS-Poll has its two MSBs each set to 1 */
434 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
435
436 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
437 memcpy(pspoll->ta, sdata->dev->dev_addr, ETH_ALEN);
438
439 ieee80211_tx_skb(sdata, skb, 0);
440 }
441
442 void ieee80211_send_nullfunc(struct ieee80211_local *local,
443 struct ieee80211_sub_if_data *sdata,
444 int powersave)
445 {
446 struct sk_buff *skb;
447 struct ieee80211_hdr *nullfunc;
448 __le16 fc;
449
450 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
451 return;
452
453 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
454 if (!skb) {
455 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
456 "frame\n", sdata->dev->name);
457 return;
458 }
459 skb_reserve(skb, local->hw.extra_tx_headroom);
460
461 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
462 memset(nullfunc, 0, 24);
463 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
464 IEEE80211_FCTL_TODS);
465 if (powersave)
466 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
467 nullfunc->frame_control = fc;
468 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
469 memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
470 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
471
472 ieee80211_tx_skb(sdata, skb, 0);
473 }
474
475 /* spectrum management related things */
476 static void ieee80211_chswitch_work(struct work_struct *work)
477 {
478 struct ieee80211_sub_if_data *sdata =
479 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
480 struct ieee80211_bss *bss;
481 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
482
483 if (!netif_running(sdata->dev))
484 return;
485
486 bss = ieee80211_rx_bss_get(sdata->local, ifmgd->bssid,
487 sdata->local->hw.conf.channel->center_freq,
488 ifmgd->ssid, ifmgd->ssid_len);
489 if (!bss)
490 goto exit;
491
492 sdata->local->oper_channel = sdata->local->csa_channel;
493 /* XXX: shouldn't really modify cfg80211-owned data! */
494 if (!ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL))
495 bss->cbss.channel = sdata->local->oper_channel;
496
497 ieee80211_rx_bss_put(sdata->local, bss);
498 exit:
499 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
500 ieee80211_wake_queues_by_reason(&sdata->local->hw,
501 IEEE80211_QUEUE_STOP_REASON_CSA);
502 }
503
504 static void ieee80211_chswitch_timer(unsigned long data)
505 {
506 struct ieee80211_sub_if_data *sdata =
507 (struct ieee80211_sub_if_data *) data;
508 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
509
510 if (sdata->local->quiescing) {
511 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
512 return;
513 }
514
515 queue_work(sdata->local->hw.workqueue, &ifmgd->chswitch_work);
516 }
517
518 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
519 struct ieee80211_channel_sw_ie *sw_elem,
520 struct ieee80211_bss *bss)
521 {
522 struct ieee80211_channel *new_ch;
523 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
524 int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
525
526 if (ifmgd->state != IEEE80211_STA_MLME_ASSOCIATED)
527 return;
528
529 if (sdata->local->sw_scanning || sdata->local->hw_scanning)
530 return;
531
532 /* Disregard subsequent beacons if we are already running a timer
533 processing a CSA */
534
535 if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
536 return;
537
538 new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
539 if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
540 return;
541
542 sdata->local->csa_channel = new_ch;
543
544 if (sw_elem->count <= 1) {
545 queue_work(sdata->local->hw.workqueue, &ifmgd->chswitch_work);
546 } else {
547 ieee80211_stop_queues_by_reason(&sdata->local->hw,
548 IEEE80211_QUEUE_STOP_REASON_CSA);
549 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
550 mod_timer(&ifmgd->chswitch_timer,
551 jiffies +
552 msecs_to_jiffies(sw_elem->count *
553 bss->cbss.beacon_interval));
554 }
555 }
556
557 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
558 u16 capab_info, u8 *pwr_constr_elem,
559 u8 pwr_constr_elem_len)
560 {
561 struct ieee80211_conf *conf = &sdata->local->hw.conf;
562
563 if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
564 return;
565
566 /* Power constraint IE length should be 1 octet */
567 if (pwr_constr_elem_len != 1)
568 return;
569
570 if ((*pwr_constr_elem <= conf->channel->max_power) &&
571 (*pwr_constr_elem != sdata->local->power_constr_level)) {
572 sdata->local->power_constr_level = *pwr_constr_elem;
573 ieee80211_hw_config(sdata->local, 0);
574 }
575 }
576
577 /* powersave */
578 static void ieee80211_enable_ps(struct ieee80211_local *local,
579 struct ieee80211_sub_if_data *sdata)
580 {
581 struct ieee80211_conf *conf = &local->hw.conf;
582
583 /*
584 * If we are scanning right now then the parameters will
585 * take effect when scan finishes.
586 */
587 if (local->hw_scanning || local->sw_scanning)
588 return;
589
590 if (conf->dynamic_ps_timeout > 0 &&
591 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
592 mod_timer(&local->dynamic_ps_timer, jiffies +
593 msecs_to_jiffies(conf->dynamic_ps_timeout));
594 } else {
595 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
596 ieee80211_send_nullfunc(local, sdata, 1);
597 conf->flags |= IEEE80211_CONF_PS;
598 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
599 }
600 }
601
602 static void ieee80211_change_ps(struct ieee80211_local *local)
603 {
604 struct ieee80211_conf *conf = &local->hw.conf;
605
606 if (local->ps_sdata) {
607 ieee80211_enable_ps(local, local->ps_sdata);
608 } else if (conf->flags & IEEE80211_CONF_PS) {
609 conf->flags &= ~IEEE80211_CONF_PS;
610 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
611 del_timer_sync(&local->dynamic_ps_timer);
612 cancel_work_sync(&local->dynamic_ps_enable_work);
613 }
614 }
615
616 /* need to hold RTNL or interface lock */
617 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
618 {
619 struct ieee80211_sub_if_data *sdata, *found = NULL;
620 int count = 0;
621
622 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
623 local->ps_sdata = NULL;
624 return;
625 }
626
627 list_for_each_entry(sdata, &local->interfaces, list) {
628 if (!netif_running(sdata->dev))
629 continue;
630 if (sdata->vif.type != NL80211_IFTYPE_STATION)
631 continue;
632 found = sdata;
633 count++;
634 }
635
636 if (count == 1 && found->u.mgd.powersave &&
637 (found->u.mgd.flags & IEEE80211_STA_ASSOCIATED) &&
638 !(found->u.mgd.flags & IEEE80211_STA_PROBEREQ_POLL)) {
639 s32 beaconint_us;
640
641 if (latency < 0)
642 latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
643
644 beaconint_us = ieee80211_tu_to_usec(
645 found->vif.bss_conf.beacon_int);
646
647 if (beaconint_us > latency) {
648 local->ps_sdata = NULL;
649 } else {
650 u8 dtimper = found->vif.bss_conf.dtim_period;
651 int maxslp = 1;
652
653 if (dtimper > 1)
654 maxslp = min_t(int, dtimper,
655 latency / beaconint_us);
656
657 local->hw.conf.max_sleep_period = maxslp;
658 local->ps_sdata = found;
659 }
660 } else {
661 local->ps_sdata = NULL;
662 }
663
664 ieee80211_change_ps(local);
665 }
666
667 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
668 {
669 struct ieee80211_local *local =
670 container_of(work, struct ieee80211_local,
671 dynamic_ps_disable_work);
672
673 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
674 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
675 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
676 }
677
678 ieee80211_wake_queues_by_reason(&local->hw,
679 IEEE80211_QUEUE_STOP_REASON_PS);
680 }
681
682 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
683 {
684 struct ieee80211_local *local =
685 container_of(work, struct ieee80211_local,
686 dynamic_ps_enable_work);
687 struct ieee80211_sub_if_data *sdata = local->ps_sdata;
688
689 /* can only happen when PS was just disabled anyway */
690 if (!sdata)
691 return;
692
693 if (local->hw.conf.flags & IEEE80211_CONF_PS)
694 return;
695
696 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
697 ieee80211_send_nullfunc(local, sdata, 1);
698
699 local->hw.conf.flags |= IEEE80211_CONF_PS;
700 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
701 }
702
703 void ieee80211_dynamic_ps_timer(unsigned long data)
704 {
705 struct ieee80211_local *local = (void *) data;
706
707 if (local->quiescing)
708 return;
709
710 queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
711 }
712
713 /* MLME */
714 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
715 struct ieee80211_if_managed *ifmgd,
716 u8 *wmm_param, size_t wmm_param_len)
717 {
718 struct ieee80211_tx_queue_params params;
719 size_t left;
720 int count;
721 u8 *pos;
722
723 if (!(ifmgd->flags & IEEE80211_STA_WMM_ENABLED))
724 return;
725
726 if (!wmm_param)
727 return;
728
729 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
730 return;
731 count = wmm_param[6] & 0x0f;
732 if (count == ifmgd->wmm_last_param_set)
733 return;
734 ifmgd->wmm_last_param_set = count;
735
736 pos = wmm_param + 8;
737 left = wmm_param_len - 8;
738
739 memset(&params, 0, sizeof(params));
740
741 local->wmm_acm = 0;
742 for (; left >= 4; left -= 4, pos += 4) {
743 int aci = (pos[0] >> 5) & 0x03;
744 int acm = (pos[0] >> 4) & 0x01;
745 int queue;
746
747 switch (aci) {
748 case 1: /* AC_BK */
749 queue = 3;
750 if (acm)
751 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
752 break;
753 case 2: /* AC_VI */
754 queue = 1;
755 if (acm)
756 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
757 break;
758 case 3: /* AC_VO */
759 queue = 0;
760 if (acm)
761 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
762 break;
763 case 0: /* AC_BE */
764 default:
765 queue = 2;
766 if (acm)
767 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
768 break;
769 }
770
771 params.aifs = pos[0] & 0x0f;
772 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
773 params.cw_min = ecw2cw(pos[1] & 0x0f);
774 params.txop = get_unaligned_le16(pos + 2);
775 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
776 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
777 "cWmin=%d cWmax=%d txop=%d\n",
778 wiphy_name(local->hw.wiphy), queue, aci, acm,
779 params.aifs, params.cw_min, params.cw_max, params.txop);
780 #endif
781 if (drv_conf_tx(local, queue, &params) && local->ops->conf_tx)
782 printk(KERN_DEBUG "%s: failed to set TX queue "
783 "parameters for queue %d\n",
784 wiphy_name(local->hw.wiphy), queue);
785 }
786 }
787
788 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
789 u16 capab, bool erp_valid, u8 erp)
790 {
791 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
792 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
793 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
794 #endif
795 u32 changed = 0;
796 bool use_protection;
797 bool use_short_preamble;
798 bool use_short_slot;
799
800 if (erp_valid) {
801 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
802 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
803 } else {
804 use_protection = false;
805 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
806 }
807
808 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
809
810 if (use_protection != bss_conf->use_cts_prot) {
811 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
812 if (net_ratelimit()) {
813 printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
814 sdata->dev->name,
815 use_protection ? "enabled" : "disabled",
816 ifmgd->bssid);
817 }
818 #endif
819 bss_conf->use_cts_prot = use_protection;
820 changed |= BSS_CHANGED_ERP_CTS_PROT;
821 }
822
823 if (use_short_preamble != bss_conf->use_short_preamble) {
824 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
825 if (net_ratelimit()) {
826 printk(KERN_DEBUG "%s: switched to %s barker preamble"
827 " (BSSID=%pM)\n",
828 sdata->dev->name,
829 use_short_preamble ? "short" : "long",
830 ifmgd->bssid);
831 }
832 #endif
833 bss_conf->use_short_preamble = use_short_preamble;
834 changed |= BSS_CHANGED_ERP_PREAMBLE;
835 }
836
837 if (use_short_slot != bss_conf->use_short_slot) {
838 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
839 if (net_ratelimit()) {
840 printk(KERN_DEBUG "%s: switched to %s slot time"
841 " (BSSID=%pM)\n",
842 sdata->dev->name,
843 use_short_slot ? "short" : "long",
844 ifmgd->bssid);
845 }
846 #endif
847 bss_conf->use_short_slot = use_short_slot;
848 changed |= BSS_CHANGED_ERP_SLOT;
849 }
850
851 return changed;
852 }
853
854 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
855 u32 bss_info_changed)
856 {
857 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
858 struct ieee80211_local *local = sdata->local;
859 struct ieee80211_conf *conf = &local_to_hw(local)->conf;
860
861 struct ieee80211_bss *bss;
862
863 bss_info_changed |= BSS_CHANGED_ASSOC;
864 ifmgd->flags |= IEEE80211_STA_ASSOCIATED;
865
866 bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
867 conf->channel->center_freq,
868 ifmgd->ssid, ifmgd->ssid_len);
869 if (bss) {
870 /* set timing information */
871 sdata->vif.bss_conf.beacon_int = bss->cbss.beacon_interval;
872 sdata->vif.bss_conf.timestamp = bss->cbss.tsf;
873 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
874
875 bss_info_changed |= BSS_CHANGED_BEACON_INT;
876 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
877 bss->cbss.capability, bss->has_erp_value, bss->erp_value);
878
879 ieee80211_rx_bss_put(local, bss);
880 }
881
882 ifmgd->flags |= IEEE80211_STA_PREV_BSSID_SET;
883 memcpy(ifmgd->prev_bssid, sdata->u.mgd.bssid, ETH_ALEN);
884
885 ifmgd->last_probe = jiffies;
886 ieee80211_led_assoc(local, 1);
887
888 sdata->vif.bss_conf.assoc = 1;
889 /*
890 * For now just always ask the driver to update the basic rateset
891 * when we have associated, we aren't checking whether it actually
892 * changed or not.
893 */
894 bss_info_changed |= BSS_CHANGED_BASIC_RATES;
895
896 /* And the BSSID changed - we're associated now */
897 bss_info_changed |= BSS_CHANGED_BSSID;
898
899 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
900
901 /* will be same as sdata */
902 if (local->ps_sdata) {
903 mutex_lock(&local->iflist_mtx);
904 ieee80211_recalc_ps(local, -1);
905 mutex_unlock(&local->iflist_mtx);
906 }
907
908 netif_tx_start_all_queues(sdata->dev);
909 netif_carrier_on(sdata->dev);
910 }
911
912 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata)
913 {
914 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
915 struct ieee80211_local *local = sdata->local;
916
917 ifmgd->direct_probe_tries++;
918 if (ifmgd->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
919 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
920 sdata->dev->name, ifmgd->bssid);
921 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
922 ieee80211_recalc_idle(local);
923 cfg80211_send_auth_timeout(sdata->dev, ifmgd->bssid,
924 GFP_KERNEL);
925
926 /*
927 * Most likely AP is not in the range so remove the
928 * bss information associated to the AP
929 */
930 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
931 sdata->local->hw.conf.channel->center_freq,
932 ifmgd->ssid, ifmgd->ssid_len);
933
934 /*
935 * We might have a pending scan which had no chance to run yet
936 * due to state == IEEE80211_STA_MLME_DIRECT_PROBE.
937 * Hence, queue the STAs work again
938 */
939 queue_work(local->hw.workqueue, &ifmgd->work);
940 return;
941 }
942
943 printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
944 sdata->dev->name, ifmgd->bssid,
945 ifmgd->direct_probe_tries);
946
947 ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
948
949 /* Direct probe is sent to broadcast address as some APs
950 * will not answer to direct packet in unassociated state.
951 */
952 ieee80211_send_probe_req(sdata, NULL,
953 ifmgd->ssid, ifmgd->ssid_len, NULL, 0);
954
955 mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
956 }
957
958
959 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata)
960 {
961 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
962 struct ieee80211_local *local = sdata->local;
963
964 ifmgd->auth_tries++;
965 if (ifmgd->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
966 printk(KERN_DEBUG "%s: authentication with AP %pM"
967 " timed out\n",
968 sdata->dev->name, ifmgd->bssid);
969 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
970 ieee80211_recalc_idle(local);
971 cfg80211_send_auth_timeout(sdata->dev, ifmgd->bssid,
972 GFP_KERNEL);
973 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
974 sdata->local->hw.conf.channel->center_freq,
975 ifmgd->ssid, ifmgd->ssid_len);
976
977 /*
978 * We might have a pending scan which had no chance to run yet
979 * due to state == IEEE80211_STA_MLME_AUTHENTICATE.
980 * Hence, queue the STAs work again
981 */
982 queue_work(local->hw.workqueue, &ifmgd->work);
983 return;
984 }
985
986 ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
987 printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
988 sdata->dev->name, ifmgd->bssid);
989
990 ieee80211_send_auth(sdata, 1, ifmgd->auth_alg, ifmgd->sme_auth_ie,
991 ifmgd->sme_auth_ie_len, ifmgd->bssid, 0);
992 ifmgd->auth_transaction = 2;
993
994 mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
995 }
996
997 /*
998 * The disassoc 'reason' argument can be either our own reason
999 * if self disconnected or a reason code from the AP.
1000 */
1001 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1002 bool deauth, bool self_disconnected,
1003 u16 reason)
1004 {
1005 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1006 struct ieee80211_local *local = sdata->local;
1007 struct ieee80211_conf *conf = &local_to_hw(local)->conf;
1008 struct ieee80211_bss *bss;
1009 struct sta_info *sta;
1010 u32 changed = 0, config_changed = 0;
1011
1012 if (deauth) {
1013 ifmgd->direct_probe_tries = 0;
1014 ifmgd->auth_tries = 0;
1015 }
1016 ifmgd->assoc_scan_tries = 0;
1017 ifmgd->assoc_tries = 0;
1018
1019 netif_tx_stop_all_queues(sdata->dev);
1020 netif_carrier_off(sdata->dev);
1021
1022 rcu_read_lock();
1023 sta = sta_info_get(local, ifmgd->bssid);
1024 if (sta)
1025 ieee80211_sta_tear_down_BA_sessions(sta);
1026 rcu_read_unlock();
1027
1028 bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
1029 conf->channel->center_freq,
1030 ifmgd->ssid, ifmgd->ssid_len);
1031
1032 if (bss)
1033 ieee80211_rx_bss_put(local, bss);
1034
1035 if (self_disconnected) {
1036 if (deauth)
1037 ieee80211_send_deauth_disassoc(sdata,
1038 IEEE80211_STYPE_DEAUTH, reason);
1039 else
1040 ieee80211_send_deauth_disassoc(sdata,
1041 IEEE80211_STYPE_DISASSOC, reason);
1042 }
1043
1044 ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
1045 changed |= ieee80211_reset_erp_info(sdata);
1046
1047 ieee80211_led_assoc(local, 0);
1048 changed |= BSS_CHANGED_ASSOC;
1049 sdata->vif.bss_conf.assoc = false;
1050
1051 if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT) {
1052 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1053 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
1054 sdata->local->hw.conf.channel->center_freq,
1055 ifmgd->ssid, ifmgd->ssid_len);
1056 }
1057
1058 ieee80211_set_wmm_default(sdata);
1059
1060 ieee80211_recalc_idle(local);
1061
1062 /* channel(_type) changes are handled by ieee80211_hw_config */
1063 local->oper_channel_type = NL80211_CHAN_NO_HT;
1064
1065 /* on the next assoc, re-program HT parameters */
1066 sdata->ht_opmode_valid = false;
1067
1068 local->power_constr_level = 0;
1069
1070 del_timer_sync(&local->dynamic_ps_timer);
1071 cancel_work_sync(&local->dynamic_ps_enable_work);
1072
1073 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1074 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1075 config_changed |= IEEE80211_CONF_CHANGE_PS;
1076 }
1077
1078 ieee80211_hw_config(local, config_changed);
1079
1080 /* And the BSSID changed -- not very interesting here */
1081 changed |= BSS_CHANGED_BSSID;
1082 ieee80211_bss_info_change_notify(sdata, changed);
1083
1084 rcu_read_lock();
1085
1086 sta = sta_info_get(local, ifmgd->bssid);
1087 if (!sta) {
1088 rcu_read_unlock();
1089 return;
1090 }
1091
1092 sta_info_unlink(&sta);
1093
1094 rcu_read_unlock();
1095
1096 sta_info_destroy(sta);
1097 }
1098
1099 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata)
1100 {
1101 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1102 struct ieee80211_local *local = sdata->local;
1103
1104 ifmgd->assoc_tries++;
1105 if (ifmgd->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
1106 printk(KERN_DEBUG "%s: association with AP %pM"
1107 " timed out\n",
1108 sdata->dev->name, ifmgd->bssid);
1109 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1110 ieee80211_recalc_idle(local);
1111 cfg80211_send_assoc_timeout(sdata->dev, ifmgd->bssid,
1112 GFP_KERNEL);
1113 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
1114 sdata->local->hw.conf.channel->center_freq,
1115 ifmgd->ssid, ifmgd->ssid_len);
1116 /*
1117 * We might have a pending scan which had no chance to run yet
1118 * due to state == IEEE80211_STA_MLME_ASSOCIATE.
1119 * Hence, queue the STAs work again
1120 */
1121 queue_work(local->hw.workqueue, &ifmgd->work);
1122 return;
1123 }
1124
1125 ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE;
1126 printk(KERN_DEBUG "%s: associate with AP %pM\n",
1127 sdata->dev->name, ifmgd->bssid);
1128 ieee80211_send_assoc(sdata);
1129
1130 mod_timer(&ifmgd->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
1131 }
1132
1133 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1134 struct ieee80211_hdr *hdr)
1135 {
1136 /*
1137 * We can postpone the mgd.timer whenever receiving unicast frames
1138 * from AP because we know that the connection is working both ways
1139 * at that time. But multicast frames (and hence also beacons) must
1140 * be ignored here, because we need to trigger the timer during
1141 * data idle periods for sending the periodical probe request to
1142 * the AP.
1143 */
1144 if (!is_multicast_ether_addr(hdr->addr1))
1145 mod_timer(&sdata->u.mgd.timer,
1146 jiffies + IEEE80211_MONITORING_INTERVAL);
1147 }
1148
1149 void ieee80211_beacon_loss_work(struct work_struct *work)
1150 {
1151 struct ieee80211_sub_if_data *sdata =
1152 container_of(work, struct ieee80211_sub_if_data,
1153 u.mgd.beacon_loss_work);
1154 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1155
1156 /*
1157 * The driver has already reported this event and we have
1158 * already sent a probe request. Maybe the AP died and the
1159 * driver keeps reporting until we disassociate... We have
1160 * to ignore that because otherwise we would continually
1161 * reset the timer and never check whether we received a
1162 * probe response!
1163 */
1164 if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL)
1165 return;
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
1177 mutex_lock(&sdata->local->iflist_mtx);
1178 ieee80211_recalc_ps(sdata->local, -1);
1179 mutex_unlock(&sdata->local->iflist_mtx);
1180
1181 ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1182 ifmgd->ssid_len, NULL, 0);
1183
1184 mod_timer(&ifmgd->timer, jiffies + IEEE80211_PROBE_WAIT);
1185 }
1186
1187 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1188 {
1189 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1190
1191 queue_work(sdata->local->hw.workqueue,
1192 &sdata->u.mgd.beacon_loss_work);
1193 }
1194 EXPORT_SYMBOL(ieee80211_beacon_loss);
1195
1196 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata)
1197 {
1198 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1199 struct ieee80211_local *local = sdata->local;
1200 struct sta_info *sta;
1201 unsigned long last_rx;
1202 bool disassoc = false;
1203
1204 /* TODO: start monitoring current AP signal quality and number of
1205 * missed beacons. Scan other channels every now and then and search
1206 * for better APs. */
1207 /* TODO: remove expired BSSes */
1208
1209 ifmgd->state = IEEE80211_STA_MLME_ASSOCIATED;
1210
1211 rcu_read_lock();
1212
1213 sta = sta_info_get(local, ifmgd->bssid);
1214 if (!sta) {
1215 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
1216 sdata->dev->name, ifmgd->bssid);
1217 disassoc = true;
1218 rcu_read_unlock();
1219 goto out;
1220 }
1221
1222 last_rx = sta->last_rx;
1223 rcu_read_unlock();
1224
1225 if ((ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) &&
1226 time_after(jiffies, last_rx + IEEE80211_PROBE_WAIT)) {
1227 printk(KERN_DEBUG "%s: no probe response from AP %pM "
1228 "- disassociating\n",
1229 sdata->dev->name, ifmgd->bssid);
1230 disassoc = true;
1231 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1232 goto out;
1233 }
1234
1235 /*
1236 * Beacon filtering is only enabled with power save and then the
1237 * stack should not check for beacon loss.
1238 */
1239 if (!((local->hw.flags & IEEE80211_HW_BEACON_FILTER) &&
1240 (local->hw.conf.flags & IEEE80211_CONF_PS)) &&
1241 time_after(jiffies,
1242 ifmgd->last_beacon + IEEE80211_MONITORING_INTERVAL)) {
1243 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1244 if (net_ratelimit()) {
1245 printk(KERN_DEBUG "%s: beacon loss from AP %pM "
1246 "- sending probe request\n",
1247 sdata->dev->name, ifmgd->bssid);
1248 }
1249 #endif
1250 ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1251 mutex_lock(&local->iflist_mtx);
1252 ieee80211_recalc_ps(local, -1);
1253 mutex_unlock(&local->iflist_mtx);
1254 ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1255 ifmgd->ssid_len, NULL, 0);
1256 mod_timer(&ifmgd->timer, jiffies + IEEE80211_PROBE_WAIT);
1257 goto out;
1258 }
1259
1260 if (time_after(jiffies, last_rx + IEEE80211_PROBE_IDLE_TIME)) {
1261 ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1262 mutex_lock(&local->iflist_mtx);
1263 ieee80211_recalc_ps(local, -1);
1264 mutex_unlock(&local->iflist_mtx);
1265 ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1266 ifmgd->ssid_len, NULL, 0);
1267 }
1268
1269 out:
1270 if (!disassoc)
1271 mod_timer(&ifmgd->timer,
1272 jiffies + IEEE80211_MONITORING_INTERVAL);
1273 else
1274 ieee80211_set_disassoc(sdata, true, true,
1275 WLAN_REASON_PREV_AUTH_NOT_VALID);
1276 }
1277
1278
1279 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata)
1280 {
1281 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1282
1283 printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1284 ifmgd->flags |= IEEE80211_STA_AUTHENTICATED;
1285 /* Wait for SME to request association */
1286 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1287 ieee80211_recalc_idle(sdata->local);
1288 }
1289
1290
1291 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1292 struct ieee80211_mgmt *mgmt,
1293 size_t len)
1294 {
1295 u8 *pos;
1296 struct ieee802_11_elems elems;
1297
1298 pos = mgmt->u.auth.variable;
1299 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1300 if (!elems.challenge)
1301 return;
1302 ieee80211_send_auth(sdata, 3, sdata->u.mgd.auth_alg,
1303 elems.challenge - 2, elems.challenge_len + 2,
1304 sdata->u.mgd.bssid, 1);
1305 sdata->u.mgd.auth_transaction = 4;
1306 }
1307
1308 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1309 struct ieee80211_mgmt *mgmt,
1310 size_t len)
1311 {
1312 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1313 u16 auth_alg, auth_transaction, status_code;
1314
1315 if (ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE)
1316 return;
1317
1318 if (len < 24 + 6)
1319 return;
1320
1321 if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
1322 return;
1323
1324 if (memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
1325 return;
1326
1327 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1328 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1329 status_code = le16_to_cpu(mgmt->u.auth.status_code);
1330
1331 if (auth_alg != ifmgd->auth_alg ||
1332 auth_transaction != ifmgd->auth_transaction)
1333 return;
1334
1335 if (status_code != WLAN_STATUS_SUCCESS) {
1336 cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, len,
1337 GFP_KERNEL);
1338 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1339 ieee80211_recalc_idle(sdata->local);
1340 return;
1341 }
1342
1343 switch (ifmgd->auth_alg) {
1344 case WLAN_AUTH_OPEN:
1345 case WLAN_AUTH_LEAP:
1346 case WLAN_AUTH_FT:
1347 ieee80211_auth_completed(sdata);
1348 cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, len,
1349 GFP_KERNEL);
1350 break;
1351 case WLAN_AUTH_SHARED_KEY:
1352 if (ifmgd->auth_transaction == 4) {
1353 ieee80211_auth_completed(sdata);
1354 cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, len,
1355 GFP_KERNEL);
1356 } else
1357 ieee80211_auth_challenge(sdata, mgmt, len);
1358 break;
1359 }
1360 }
1361
1362
1363 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1364 struct ieee80211_mgmt *mgmt,
1365 size_t len)
1366 {
1367 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1368 u16 reason_code;
1369
1370 if (len < 24 + 2)
1371 return;
1372
1373 if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
1374 return;
1375
1376 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1377
1378 if (ifmgd->flags & IEEE80211_STA_AUTHENTICATED)
1379 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
1380 sdata->dev->name, reason_code);
1381
1382 ieee80211_set_disassoc(sdata, true, false, 0);
1383 ifmgd->flags &= ~IEEE80211_STA_AUTHENTICATED;
1384 cfg80211_send_deauth(sdata->dev, (u8 *) mgmt, len, GFP_KERNEL);
1385 }
1386
1387
1388 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1389 struct ieee80211_mgmt *mgmt,
1390 size_t len)
1391 {
1392 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1393 u16 reason_code;
1394
1395 if (len < 24 + 2)
1396 return;
1397
1398 if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
1399 return;
1400
1401 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1402
1403 if (ifmgd->flags & IEEE80211_STA_ASSOCIATED)
1404 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1405 sdata->dev->name, reason_code);
1406
1407 ieee80211_set_disassoc(sdata, false, false, reason_code);
1408 cfg80211_send_disassoc(sdata->dev, (u8 *) mgmt, len, GFP_KERNEL);
1409 }
1410
1411
1412 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1413 struct ieee80211_mgmt *mgmt,
1414 size_t len,
1415 int reassoc)
1416 {
1417 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1418 struct ieee80211_local *local = sdata->local;
1419 struct ieee80211_supported_band *sband;
1420 struct sta_info *sta;
1421 u32 rates, basic_rates;
1422 u16 capab_info, status_code, aid;
1423 struct ieee802_11_elems elems;
1424 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1425 u8 *pos;
1426 u32 changed = 0;
1427 int i, j;
1428 bool have_higher_than_11mbit = false, newsta = false;
1429 u16 ap_ht_cap_flags;
1430
1431 /* AssocResp and ReassocResp have identical structure, so process both
1432 * of them in this function. */
1433
1434 if (ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE)
1435 return;
1436
1437 if (len < 24 + 6)
1438 return;
1439
1440 if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
1441 return;
1442
1443 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1444 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1445 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1446
1447 printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1448 "status=%d aid=%d)\n",
1449 sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1450 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1451
1452 pos = mgmt->u.assoc_resp.variable;
1453 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1454
1455 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1456 elems.timeout_int && elems.timeout_int_len == 5 &&
1457 elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1458 u32 tu, ms;
1459 tu = get_unaligned_le32(elems.timeout_int + 1);
1460 ms = tu * 1024 / 1000;
1461 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1462 "comeback duration %u TU (%u ms)\n",
1463 sdata->dev->name, tu, ms);
1464 if (ms > IEEE80211_ASSOC_TIMEOUT)
1465 mod_timer(&ifmgd->timer,
1466 jiffies + msecs_to_jiffies(ms));
1467 return;
1468 }
1469
1470 if (status_code != WLAN_STATUS_SUCCESS) {
1471 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1472 sdata->dev->name, status_code);
1473 /* if this was a reassociation, ensure we try a "full"
1474 * association next time. This works around some broken APs
1475 * which do not correctly reject reassociation requests. */
1476 ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1477 cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, len,
1478 GFP_KERNEL);
1479 /* Wait for SME to decide what to do next */
1480 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1481 ieee80211_recalc_idle(local);
1482 return;
1483 }
1484
1485 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1486 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1487 "set\n", sdata->dev->name, aid);
1488 aid &= ~(BIT(15) | BIT(14));
1489
1490 if (!elems.supp_rates) {
1491 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1492 sdata->dev->name);
1493 return;
1494 }
1495
1496 printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1497 ifmgd->aid = aid;
1498 ifmgd->ap_capab = capab_info;
1499
1500 kfree(ifmgd->assocresp_ies);
1501 ifmgd->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1502 ifmgd->assocresp_ies = kmalloc(ifmgd->assocresp_ies_len, GFP_KERNEL);
1503 if (ifmgd->assocresp_ies)
1504 memcpy(ifmgd->assocresp_ies, pos, ifmgd->assocresp_ies_len);
1505
1506 rcu_read_lock();
1507
1508 /* Add STA entry for the AP */
1509 sta = sta_info_get(local, ifmgd->bssid);
1510 if (!sta) {
1511 newsta = true;
1512
1513 sta = sta_info_alloc(sdata, ifmgd->bssid, GFP_ATOMIC);
1514 if (!sta) {
1515 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1516 " the AP\n", sdata->dev->name);
1517 rcu_read_unlock();
1518 return;
1519 }
1520
1521 /* update new sta with its last rx activity */
1522 sta->last_rx = jiffies;
1523 }
1524
1525 /*
1526 * FIXME: Do we really need to update the sta_info's information here?
1527 * We already know about the AP (we found it in our list) so it
1528 * should already be filled with the right info, no?
1529 * As is stands, all this is racy because typically we assume
1530 * the information that is filled in here (except flags) doesn't
1531 * change while a STA structure is alive. As such, it should move
1532 * to between the sta_info_alloc() and sta_info_insert() above.
1533 */
1534
1535 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP);
1536 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1537 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1538
1539 rates = 0;
1540 basic_rates = 0;
1541 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1542
1543 for (i = 0; i < elems.supp_rates_len; i++) {
1544 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1545 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1546
1547 if (rate > 110)
1548 have_higher_than_11mbit = true;
1549
1550 for (j = 0; j < sband->n_bitrates; j++) {
1551 if (sband->bitrates[j].bitrate == rate) {
1552 rates |= BIT(j);
1553 if (is_basic)
1554 basic_rates |= BIT(j);
1555 break;
1556 }
1557 }
1558 }
1559
1560 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1561 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1562 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1563
1564 if (rate > 110)
1565 have_higher_than_11mbit = true;
1566
1567 for (j = 0; j < sband->n_bitrates; j++) {
1568 if (sband->bitrates[j].bitrate == rate) {
1569 rates |= BIT(j);
1570 if (is_basic)
1571 basic_rates |= BIT(j);
1572 break;
1573 }
1574 }
1575 }
1576
1577 sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1578 sdata->vif.bss_conf.basic_rates = basic_rates;
1579
1580 /* cf. IEEE 802.11 9.2.12 */
1581 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1582 have_higher_than_11mbit)
1583 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1584 else
1585 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1586
1587 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1588 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1589 elems.ht_cap_elem, &sta->sta.ht_cap);
1590
1591 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1592
1593 rate_control_rate_init(sta);
1594
1595 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1596 set_sta_flags(sta, WLAN_STA_MFP);
1597
1598 if (elems.wmm_param)
1599 set_sta_flags(sta, WLAN_STA_WME);
1600
1601 if (newsta) {
1602 int err = sta_info_insert(sta);
1603 if (err) {
1604 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1605 " the AP (error %d)\n", sdata->dev->name, err);
1606 rcu_read_unlock();
1607 return;
1608 }
1609 }
1610
1611 rcu_read_unlock();
1612
1613 if (elems.wmm_param)
1614 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1615 elems.wmm_param_len);
1616 else
1617 ieee80211_set_wmm_default(sdata);
1618
1619 if (elems.ht_info_elem && elems.wmm_param &&
1620 (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
1621 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1622 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1623 ap_ht_cap_flags);
1624
1625 /* set AID and assoc capability,
1626 * ieee80211_set_associated() will tell the driver */
1627 bss_conf->aid = aid;
1628 bss_conf->assoc_capability = capab_info;
1629 ieee80211_set_associated(sdata, changed);
1630
1631 /*
1632 * initialise the time of last beacon to be the association time,
1633 * otherwise beacon loss check will trigger immediately
1634 */
1635 ifmgd->last_beacon = jiffies;
1636
1637 ieee80211_associated(sdata);
1638 cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, len, GFP_KERNEL);
1639 }
1640
1641
1642 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1643 struct ieee80211_mgmt *mgmt,
1644 size_t len,
1645 struct ieee80211_rx_status *rx_status,
1646 struct ieee802_11_elems *elems,
1647 bool beacon)
1648 {
1649 struct ieee80211_local *local = sdata->local;
1650 int freq;
1651 struct ieee80211_bss *bss;
1652 struct ieee80211_channel *channel;
1653
1654 if (elems->ds_params && elems->ds_params_len == 1)
1655 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1656 else
1657 freq = rx_status->freq;
1658
1659 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1660
1661 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1662 return;
1663
1664 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1665 channel, beacon);
1666 if (!bss)
1667 return;
1668
1669 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1670 (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN) == 0)) {
1671 struct ieee80211_channel_sw_ie *sw_elem =
1672 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1673 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1674 }
1675
1676 ieee80211_rx_bss_put(local, bss);
1677 }
1678
1679
1680 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1681 struct ieee80211_mgmt *mgmt,
1682 size_t len,
1683 struct ieee80211_rx_status *rx_status)
1684 {
1685 struct ieee80211_if_managed *ifmgd;
1686 size_t baselen;
1687 struct ieee802_11_elems elems;
1688
1689 ifmgd = &sdata->u.mgd;
1690
1691 if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1692 return; /* ignore ProbeResp to foreign address */
1693
1694 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1695 if (baselen > len)
1696 return;
1697
1698 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1699 &elems);
1700
1701 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1702
1703 /* direct probe may be part of the association flow */
1704 if (ifmgd->state == IEEE80211_STA_MLME_DIRECT_PROBE) {
1705 printk(KERN_DEBUG "%s direct probe responded\n",
1706 sdata->dev->name);
1707 ieee80211_authenticate(sdata);
1708 }
1709
1710 if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) {
1711 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1712 mutex_lock(&sdata->local->iflist_mtx);
1713 ieee80211_recalc_ps(sdata->local, -1);
1714 mutex_unlock(&sdata->local->iflist_mtx);
1715 }
1716 }
1717
1718 /*
1719 * This is the canonical list of information elements we care about,
1720 * the filter code also gives us all changes to the Microsoft OUI
1721 * (00:50:F2) vendor IE which is used for WMM which we need to track.
1722 *
1723 * We implement beacon filtering in software since that means we can
1724 * avoid processing the frame here and in cfg80211, and userspace
1725 * will not be able to tell whether the hardware supports it or not.
1726 *
1727 * XXX: This list needs to be dynamic -- userspace needs to be able to
1728 * add items it requires. It also needs to be able to tell us to
1729 * look out for other vendor IEs.
1730 */
1731 static const u64 care_about_ies =
1732 (1ULL << WLAN_EID_COUNTRY) |
1733 (1ULL << WLAN_EID_ERP_INFO) |
1734 (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1735 (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1736 (1ULL << WLAN_EID_HT_CAPABILITY) |
1737 (1ULL << WLAN_EID_HT_INFORMATION);
1738
1739 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1740 struct ieee80211_mgmt *mgmt,
1741 size_t len,
1742 struct ieee80211_rx_status *rx_status)
1743 {
1744 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1745 size_t baselen;
1746 struct ieee802_11_elems elems;
1747 struct ieee80211_local *local = sdata->local;
1748 u32 changed = 0;
1749 bool erp_valid, directed_tim = false;
1750 u8 erp_value = 0;
1751 u32 ncrc;
1752
1753 /* Process beacon from the current BSS */
1754 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1755 if (baselen > len)
1756 return;
1757
1758 if (rx_status->freq != local->hw.conf.channel->center_freq)
1759 return;
1760
1761 if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED) ||
1762 memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
1763 return;
1764
1765 if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) {
1766 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1767 if (net_ratelimit()) {
1768 printk(KERN_DEBUG "%s: cancelling probereq poll due "
1769 "to a received beacon\n", sdata->dev->name);
1770 }
1771 #endif
1772 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1773 mutex_lock(&local->iflist_mtx);
1774 ieee80211_recalc_ps(local, -1);
1775 mutex_unlock(&local->iflist_mtx);
1776 }
1777
1778 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1779 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1780 len - baselen, &elems,
1781 care_about_ies, ncrc);
1782
1783 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1784 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1785 ifmgd->aid);
1786
1787 if (ncrc != ifmgd->beacon_crc) {
1788 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1789 true);
1790
1791 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1792 elems.wmm_param_len);
1793 }
1794
1795 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1796 if (directed_tim) {
1797 if (local->hw.conf.dynamic_ps_timeout > 0) {
1798 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1799 ieee80211_hw_config(local,
1800 IEEE80211_CONF_CHANGE_PS);
1801 ieee80211_send_nullfunc(local, sdata, 0);
1802 } else {
1803 local->pspolling = true;
1804
1805 /*
1806 * Here is assumed that the driver will be
1807 * able to send ps-poll frame and receive a
1808 * response even though power save mode is
1809 * enabled, but some drivers might require
1810 * to disable power save here. This needs
1811 * to be investigated.
1812 */
1813 ieee80211_send_pspoll(local, sdata);
1814 }
1815 }
1816 }
1817
1818 if (ncrc == ifmgd->beacon_crc)
1819 return;
1820 ifmgd->beacon_crc = ncrc;
1821
1822 if (elems.erp_info && elems.erp_info_len >= 1) {
1823 erp_valid = true;
1824 erp_value = elems.erp_info[0];
1825 } else {
1826 erp_valid = false;
1827 }
1828 changed |= ieee80211_handle_bss_capability(sdata,
1829 le16_to_cpu(mgmt->u.beacon.capab_info),
1830 erp_valid, erp_value);
1831
1832
1833 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1834 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1835 struct sta_info *sta;
1836 struct ieee80211_supported_band *sband;
1837 u16 ap_ht_cap_flags;
1838
1839 rcu_read_lock();
1840
1841 sta = sta_info_get(local, ifmgd->bssid);
1842 if (!sta) {
1843 rcu_read_unlock();
1844 return;
1845 }
1846
1847 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1848
1849 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1850 elems.ht_cap_elem, &sta->sta.ht_cap);
1851
1852 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1853
1854 rcu_read_unlock();
1855
1856 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1857 ap_ht_cap_flags);
1858 }
1859
1860 if (elems.country_elem) {
1861 /* Note we are only reviewing this on beacons
1862 * for the BSSID we are associated to */
1863 regulatory_hint_11d(local->hw.wiphy,
1864 elems.country_elem, elems.country_elem_len);
1865
1866 /* TODO: IBSS also needs this */
1867 if (elems.pwr_constr_elem)
1868 ieee80211_handle_pwr_constr(sdata,
1869 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1870 elems.pwr_constr_elem,
1871 elems.pwr_constr_elem_len);
1872 }
1873
1874 ieee80211_bss_info_change_notify(sdata, changed);
1875 }
1876
1877 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1878 struct sk_buff *skb)
1879 {
1880 struct ieee80211_local *local = sdata->local;
1881 struct ieee80211_mgmt *mgmt;
1882 u16 fc;
1883
1884 if (skb->len < 24)
1885 return RX_DROP_MONITOR;
1886
1887 mgmt = (struct ieee80211_mgmt *) skb->data;
1888 fc = le16_to_cpu(mgmt->frame_control);
1889
1890 switch (fc & IEEE80211_FCTL_STYPE) {
1891 case IEEE80211_STYPE_PROBE_REQ:
1892 case IEEE80211_STYPE_PROBE_RESP:
1893 case IEEE80211_STYPE_BEACON:
1894 case IEEE80211_STYPE_AUTH:
1895 case IEEE80211_STYPE_ASSOC_RESP:
1896 case IEEE80211_STYPE_REASSOC_RESP:
1897 case IEEE80211_STYPE_DEAUTH:
1898 case IEEE80211_STYPE_DISASSOC:
1899 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1900 queue_work(local->hw.workqueue, &sdata->u.mgd.work);
1901 return RX_QUEUED;
1902 }
1903
1904 return RX_DROP_MONITOR;
1905 }
1906
1907 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1908 struct sk_buff *skb)
1909 {
1910 struct ieee80211_rx_status *rx_status;
1911 struct ieee80211_mgmt *mgmt;
1912 u16 fc;
1913
1914 rx_status = (struct ieee80211_rx_status *) skb->cb;
1915 mgmt = (struct ieee80211_mgmt *) skb->data;
1916 fc = le16_to_cpu(mgmt->frame_control);
1917
1918 switch (fc & IEEE80211_FCTL_STYPE) {
1919 case IEEE80211_STYPE_PROBE_RESP:
1920 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
1921 rx_status);
1922 break;
1923 case IEEE80211_STYPE_BEACON:
1924 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1925 rx_status);
1926 break;
1927 case IEEE80211_STYPE_AUTH:
1928 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
1929 break;
1930 case IEEE80211_STYPE_ASSOC_RESP:
1931 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 0);
1932 break;
1933 case IEEE80211_STYPE_REASSOC_RESP:
1934 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 1);
1935 break;
1936 case IEEE80211_STYPE_DEAUTH:
1937 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1938 break;
1939 case IEEE80211_STYPE_DISASSOC:
1940 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1941 break;
1942 }
1943
1944 kfree_skb(skb);
1945 }
1946
1947 static void ieee80211_sta_timer(unsigned long data)
1948 {
1949 struct ieee80211_sub_if_data *sdata =
1950 (struct ieee80211_sub_if_data *) data;
1951 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1952 struct ieee80211_local *local = sdata->local;
1953
1954 if (local->quiescing) {
1955 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1956 return;
1957 }
1958
1959 set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
1960 queue_work(local->hw.workqueue, &ifmgd->work);
1961 }
1962
1963 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata)
1964 {
1965 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1966 struct ieee80211_local *local = sdata->local;
1967
1968 /* Reset own TSF to allow time synchronization work. */
1969 drv_reset_tsf(local);
1970
1971 ifmgd->wmm_last_param_set = -1; /* allow any WMM update */
1972 ifmgd->auth_transaction = -1;
1973 ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
1974 ifmgd->assoc_scan_tries = 0;
1975 ifmgd->direct_probe_tries = 0;
1976 ifmgd->auth_tries = 0;
1977 ifmgd->assoc_tries = 0;
1978 netif_tx_stop_all_queues(sdata->dev);
1979 netif_carrier_off(sdata->dev);
1980 }
1981
1982 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata)
1983 {
1984 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1985 struct ieee80211_local *local = sdata->local;
1986 struct ieee80211_bss *bss;
1987 u8 *bssid = ifmgd->bssid, *ssid = ifmgd->ssid;
1988 u8 ssid_len = ifmgd->ssid_len;
1989 u16 capa_mask = WLAN_CAPABILITY_ESS;
1990 u16 capa_val = WLAN_CAPABILITY_ESS;
1991 struct ieee80211_channel *chan = local->oper_channel;
1992
1993 bss = (void *)cfg80211_get_bss(local->hw.wiphy, chan,
1994 bssid, ssid, ssid_len,
1995 capa_mask, capa_val);
1996
1997 if (bss) {
1998 local->oper_channel = bss->cbss.channel;
1999 local->oper_channel_type = NL80211_CHAN_NO_HT;
2000 ieee80211_hw_config(local, 0);
2001
2002 ieee80211_sta_def_wmm_params(sdata, bss->supp_rates_len,
2003 bss->supp_rates);
2004 if (sdata->u.mgd.mfp == IEEE80211_MFP_REQUIRED)
2005 sdata->u.mgd.flags |= IEEE80211_STA_MFP_ENABLED;
2006 else
2007 sdata->u.mgd.flags &= ~IEEE80211_STA_MFP_ENABLED;
2008
2009 /* Send out direct probe if no probe resp was received or
2010 * the one we have is outdated
2011 */
2012 if (!bss->last_probe_resp ||
2013 time_after(jiffies, bss->last_probe_resp
2014 + IEEE80211_SCAN_RESULT_EXPIRE))
2015 ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2016 else
2017 ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
2018
2019 ieee80211_rx_bss_put(local, bss);
2020 ieee80211_sta_reset_auth(sdata);
2021 return 0;
2022 } else {
2023 if (ifmgd->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2024
2025 ifmgd->assoc_scan_tries++;
2026
2027 ieee80211_request_internal_scan(sdata, ifmgd->ssid,
2028 ssid_len);
2029
2030 ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
2031 set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
2032 } else {
2033 ifmgd->assoc_scan_tries = 0;
2034 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
2035 ieee80211_recalc_idle(local);
2036 }
2037 }
2038 return -1;
2039 }
2040
2041
2042 static void ieee80211_sta_work(struct work_struct *work)
2043 {
2044 struct ieee80211_sub_if_data *sdata =
2045 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
2046 struct ieee80211_local *local = sdata->local;
2047 struct ieee80211_if_managed *ifmgd;
2048 struct sk_buff *skb;
2049
2050 if (!netif_running(sdata->dev))
2051 return;
2052
2053 if (local->sw_scanning || local->hw_scanning)
2054 return;
2055
2056 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2057 return;
2058
2059 /*
2060 * Nothing should have been stuffed into the workqueue during
2061 * the suspend->resume cycle. If this WARN is seen then there
2062 * is a bug with either the driver suspend or something in
2063 * mac80211 stuffing into the workqueue which we haven't yet
2064 * cleared during mac80211's suspend cycle.
2065 */
2066 if (WARN_ON(local->suspended))
2067 return;
2068
2069 ifmgd = &sdata->u.mgd;
2070
2071 while ((skb = skb_dequeue(&ifmgd->skb_queue)))
2072 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2073
2074 if (ifmgd->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2075 ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2076 ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE &&
2077 test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request)) {
2078 queue_delayed_work(local->hw.workqueue, &local->scan_work,
2079 round_jiffies_relative(0));
2080 return;
2081 }
2082
2083 if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request)) {
2084 if (ieee80211_sta_config_auth(sdata))
2085 return;
2086 clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
2087 } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request))
2088 return;
2089
2090 ieee80211_recalc_idle(local);
2091
2092 switch (ifmgd->state) {
2093 case IEEE80211_STA_MLME_DISABLED:
2094 break;
2095 case IEEE80211_STA_MLME_DIRECT_PROBE:
2096 ieee80211_direct_probe(sdata);
2097 break;
2098 case IEEE80211_STA_MLME_AUTHENTICATE:
2099 ieee80211_authenticate(sdata);
2100 break;
2101 case IEEE80211_STA_MLME_ASSOCIATE:
2102 ieee80211_associate(sdata);
2103 break;
2104 case IEEE80211_STA_MLME_ASSOCIATED:
2105 ieee80211_associated(sdata);
2106 break;
2107 default:
2108 WARN_ON(1);
2109 break;
2110 }
2111 }
2112
2113 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2114 {
2115 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2116 /*
2117 * Need to update last_beacon to avoid beacon loss
2118 * test to trigger.
2119 */
2120 sdata->u.mgd.last_beacon = jiffies;
2121
2122
2123 queue_work(sdata->local->hw.workqueue,
2124 &sdata->u.mgd.work);
2125 }
2126 }
2127
2128 #ifdef CONFIG_PM
2129 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2130 {
2131 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2132
2133 /*
2134 * we need to use atomic bitops for the running bits
2135 * only because both timers might fire at the same
2136 * time -- the code here is properly synchronised.
2137 */
2138
2139 cancel_work_sync(&ifmgd->work);
2140 cancel_work_sync(&ifmgd->beacon_loss_work);
2141 if (del_timer_sync(&ifmgd->timer))
2142 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2143
2144 cancel_work_sync(&ifmgd->chswitch_work);
2145 if (del_timer_sync(&ifmgd->chswitch_timer))
2146 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2147 }
2148
2149 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2150 {
2151 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2152
2153 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2154 add_timer(&ifmgd->timer);
2155 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2156 add_timer(&ifmgd->chswitch_timer);
2157 }
2158 #endif
2159
2160 /* interface setup */
2161 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2162 {
2163 struct ieee80211_if_managed *ifmgd;
2164 u32 hw_flags;
2165
2166 ifmgd = &sdata->u.mgd;
2167 INIT_WORK(&ifmgd->work, ieee80211_sta_work);
2168 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2169 INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
2170 setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2171 (unsigned long) sdata);
2172 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2173 (unsigned long) sdata);
2174 skb_queue_head_init(&ifmgd->skb_queue);
2175
2176 ifmgd->capab = WLAN_CAPABILITY_ESS;
2177 ifmgd->flags = 0;
2178 if (sdata->local->hw.queues >= 4)
2179 ifmgd->flags |= IEEE80211_STA_WMM_ENABLED;
2180
2181 hw_flags = sdata->local->hw.flags;
2182 }
2183
2184 /* configuration hooks */
2185 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata)
2186 {
2187 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2188 struct ieee80211_local *local = sdata->local;
2189
2190 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2191 return;
2192
2193 if (WARN_ON(ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED))
2194 ieee80211_set_disassoc(sdata, true, true,
2195 WLAN_REASON_DEAUTH_LEAVING);
2196
2197 if (WARN_ON(ifmgd->ssid_len == 0)) {
2198 /*
2199 * Only allow association to be started if a valid SSID
2200 * is configured.
2201 */
2202 return;
2203 }
2204
2205 set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
2206 queue_work(local->hw.workqueue, &ifmgd->work);
2207 }
2208
2209 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata,
2210 const char *ie, size_t len)
2211 {
2212 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2213
2214 if (len == 0 && ifmgd->extra_ie_len == 0)
2215 return -EALREADY;
2216
2217 if (len == ifmgd->extra_ie_len && ifmgd->extra_ie &&
2218 memcmp(ifmgd->extra_ie, ie, len) == 0)
2219 return -EALREADY;
2220
2221 kfree(ifmgd->extra_ie);
2222 if (len == 0) {
2223 ifmgd->extra_ie = NULL;
2224 ifmgd->extra_ie_len = 0;
2225 return 0;
2226 }
2227 ifmgd->extra_ie = kmalloc(len, GFP_KERNEL);
2228 if (!ifmgd->extra_ie) {
2229 ifmgd->extra_ie_len = 0;
2230 return -ENOMEM;
2231 }
2232 memcpy(ifmgd->extra_ie, ie, len);
2233 ifmgd->extra_ie_len = len;
2234 return 0;
2235 }
2236
2237 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2238 {
2239 printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2240 sdata->dev->name, reason);
2241
2242 ieee80211_set_disassoc(sdata, true, true, reason);
2243 return 0;
2244 }
2245
2246 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2247 {
2248 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2249
2250 printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2251 sdata->dev->name, reason);
2252
2253 if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED))
2254 return -ENOLINK;
2255
2256 ieee80211_set_disassoc(sdata, false, true, reason);
2257 return 0;
2258 }
2259
2260 /* scan finished notification */
2261 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2262 {
2263 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2264
2265 /* Restart STA timers */
2266 rcu_read_lock();
2267 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2268 ieee80211_restart_sta_timer(sdata);
2269 rcu_read_unlock();
2270 }
2271
2272 int ieee80211_max_network_latency(struct notifier_block *nb,
2273 unsigned long data, void *dummy)
2274 {
2275 s32 latency_usec = (s32) data;
2276 struct ieee80211_local *local =
2277 container_of(nb, struct ieee80211_local,
2278 network_latency_notifier);
2279
2280 mutex_lock(&local->iflist_mtx);
2281 ieee80211_recalc_ps(local, latency_usec);
2282 mutex_unlock(&local->iflist_mtx);
2283
2284 return 0;
2285 }
Linux kernel - Deliverables
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