?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
mac80211: allow disabling 40MHz on 2.4GHz
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / mac80211 / mlme.c
bloba7472c979c63669e94a1315213a4b701ed7afebd
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_AUTH_TIMEOUT (HZ / 5)
31 #define IEEE80211_AUTH_MAX_TRIES 3
32 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
33 #define IEEE80211_ASSOC_MAX_TRIES 3
34 #define IEEE80211_MAX_PROBE_TRIES 5
35
36 /*
37 * beacon loss detection timeout
38 * XXX: should depend on beacon interval
39 */
40 #define IEEE80211_BEACON_LOSS_TIME (2 * HZ)
41 /*
42 * Time the connection can be idle before we probe
43 * it to see if we can still talk to the AP.
44 */
45 #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ)
46 /*
47 * Time we wait for a probe response after sending
48 * a probe request because of beacon loss or for
49 * checking the connection still works.
50 */
51 #define IEEE80211_PROBE_WAIT (HZ / 2)
52
53 #define TMR_RUNNING_TIMER 0
54 #define TMR_RUNNING_CHANSW 1
55
56 /*
57 * All cfg80211 functions have to be called outside a locked
58 * section so that they can acquire a lock themselves... This
59 * is much simpler than queuing up things in cfg80211, but we
60 * do need some indirection for that here.
61 */
62 enum rx_mgmt_action {
63 /* no action required */
64 RX_MGMT_NONE,
65
66 /* caller must call cfg80211_send_rx_auth() */
67 RX_MGMT_CFG80211_AUTH,
68
69 /* caller must call cfg80211_send_rx_assoc() */
70 RX_MGMT_CFG80211_ASSOC,
71
72 /* caller must call cfg80211_send_deauth() */
73 RX_MGMT_CFG80211_DEAUTH,
74
75 /* caller must call cfg80211_send_disassoc() */
76 RX_MGMT_CFG80211_DISASSOC,
77
78 /* caller must call cfg80211_auth_timeout() & free work */
79 RX_MGMT_CFG80211_AUTH_TO,
80
81 /* caller must call cfg80211_assoc_timeout() & free work */
82 RX_MGMT_CFG80211_ASSOC_TO,
83 };
84
85 /* utils */
86 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
87 {
88 WARN_ON(!mutex_is_locked(&ifmgd->mtx));
89 }
90
91 /*
92 * We can have multiple work items (and connection probing)
93 * scheduling this timer, but we need to take care to only
94 * reschedule it when it should fire _earlier_ than it was
95 * asked for before, or if it's not pending right now. This
96 * function ensures that. Note that it then is required to
97 * run this function for all timeouts after the first one
98 * has happened -- the work that runs from this timer will
99 * do that.
100 */
101 static void run_again(struct ieee80211_if_managed *ifmgd,
102 unsigned long timeout)
103 {
104 ASSERT_MGD_MTX(ifmgd);
105
106 if (!timer_pending(&ifmgd->timer) ||
107 time_before(timeout, ifmgd->timer.expires))
108 mod_timer(&ifmgd->timer, timeout);
109 }
110
111 static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata)
112 {
113 if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
114 return;
115
116 mod_timer(&sdata->u.mgd.bcn_mon_timer,
117 round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME));
118 }
119
120 static int ecw2cw(int ecw)
121 {
122 return (1 << ecw) - 1;
123 }
124
125 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
126 struct ieee80211_supported_band *sband,
127 u32 *rates)
128 {
129 int i, j, count;
130 *rates = 0;
131 count = 0;
132 for (i = 0; i < bss->supp_rates_len; i++) {
133 int rate = (bss->supp_rates[i] & 0x7F) * 5;
134
135 for (j = 0; j < sband->n_bitrates; j++)
136 if (sband->bitrates[j].bitrate == rate) {
137 *rates |= BIT(j);
138 count++;
139 break;
140 }
141 }
142
143 return count;
144 }
145
146 /*
147 * ieee80211_enable_ht should be called only after the operating band
148 * has been determined as ht configuration depends on the hw's
149 * HT abilities for a specific band.
150 */
151 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
152 struct ieee80211_ht_info *hti,
153 const u8 *bssid, u16 ap_ht_cap_flags)
154 {
155 struct ieee80211_local *local = sdata->local;
156 struct ieee80211_supported_band *sband;
157 struct sta_info *sta;
158 u32 changed = 0;
159 u16 ht_opmode;
160 bool enable_ht = true, ht_changed;
161 enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
162
163 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
164
165 /* HT is not supported */
166 if (!sband->ht_cap.ht_supported)
167 enable_ht = false;
168
169 /* check that channel matches the right operating channel */
170 if (local->hw.conf.channel->center_freq !=
171 ieee80211_channel_to_frequency(hti->control_chan))
172 enable_ht = false;
173
174 if (enable_ht) {
175 channel_type = NL80211_CHAN_HT20;
176
177 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
178 (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
179 (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
180 switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
181 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
182 if (!(local->hw.conf.channel->flags &
183 IEEE80211_CHAN_NO_HT40PLUS))
184 channel_type = NL80211_CHAN_HT40PLUS;
185 break;
186 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
187 if (!(local->hw.conf.channel->flags &
188 IEEE80211_CHAN_NO_HT40MINUS))
189 channel_type = NL80211_CHAN_HT40MINUS;
190 break;
191 }
192 }
193 }
194
195 ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
196 channel_type != local->hw.conf.channel_type;
197
198 local->oper_channel_type = channel_type;
199
200 if (ht_changed) {
201 /* channel_type change automatically detected */
202 ieee80211_hw_config(local, 0);
203
204 rcu_read_lock();
205 sta = sta_info_get(sdata, bssid);
206 if (sta)
207 rate_control_rate_update(local, sband, sta,
208 IEEE80211_RC_HT_CHANGED);
209 rcu_read_unlock();
210 }
211
212 /* disable HT */
213 if (!enable_ht)
214 return 0;
215
216 ht_opmode = le16_to_cpu(hti->operation_mode);
217
218 /* if bss configuration changed store the new one */
219 if (!sdata->ht_opmode_valid ||
220 sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
221 changed |= BSS_CHANGED_HT;
222 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
223 sdata->ht_opmode_valid = true;
224 }
225
226 return changed;
227 }
228
229 /* frame sending functions */
230
231 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
232 struct ieee80211_mgd_work *wk)
233 {
234 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
235 struct ieee80211_local *local = sdata->local;
236 struct sk_buff *skb;
237 struct ieee80211_mgmt *mgmt;
238 u8 *pos;
239 const u8 *ies, *ht_ie;
240 int i, len, count, rates_len, supp_rates_len;
241 u16 capab;
242 int wmm = 0;
243 struct ieee80211_supported_band *sband;
244 u32 rates = 0;
245
246 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
247 sizeof(*mgmt) + 200 + wk->ie_len +
248 wk->ssid_len);
249 if (!skb) {
250 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
251 "frame\n", sdata->name);
252 return;
253 }
254 skb_reserve(skb, local->hw.extra_tx_headroom);
255
256 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
257
258 capab = ifmgd->capab;
259
260 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
261 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
262 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
263 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
264 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
265 }
266
267 if (wk->bss->cbss.capability & WLAN_CAPABILITY_PRIVACY)
268 capab |= WLAN_CAPABILITY_PRIVACY;
269 if (wk->bss->wmm_used)
270 wmm = 1;
271
272 /* get all rates supported by the device and the AP as
273 * some APs don't like getting a superset of their rates
274 * in the association request (e.g. D-Link DAP 1353 in
275 * b-only mode) */
276 rates_len = ieee80211_compatible_rates(wk->bss, sband, &rates);
277
278 if ((wk->bss->cbss.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
279 (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
280 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
281
282 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
283 memset(mgmt, 0, 24);
284 memcpy(mgmt->da, wk->bss->cbss.bssid, ETH_ALEN);
285 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
286 memcpy(mgmt->bssid, wk->bss->cbss.bssid, ETH_ALEN);
287
288 if (!is_zero_ether_addr(wk->prev_bssid)) {
289 skb_put(skb, 10);
290 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
291 IEEE80211_STYPE_REASSOC_REQ);
292 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
293 mgmt->u.reassoc_req.listen_interval =
294 cpu_to_le16(local->hw.conf.listen_interval);
295 memcpy(mgmt->u.reassoc_req.current_ap, wk->prev_bssid,
296 ETH_ALEN);
297 } else {
298 skb_put(skb, 4);
299 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
300 IEEE80211_STYPE_ASSOC_REQ);
301 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
302 mgmt->u.assoc_req.listen_interval =
303 cpu_to_le16(local->hw.conf.listen_interval);
304 }
305
306 /* SSID */
307 ies = pos = skb_put(skb, 2 + wk->ssid_len);
308 *pos++ = WLAN_EID_SSID;
309 *pos++ = wk->ssid_len;
310 memcpy(pos, wk->ssid, wk->ssid_len);
311
312 /* add all rates which were marked to be used above */
313 supp_rates_len = rates_len;
314 if (supp_rates_len > 8)
315 supp_rates_len = 8;
316
317 len = sband->n_bitrates;
318 pos = skb_put(skb, supp_rates_len + 2);
319 *pos++ = WLAN_EID_SUPP_RATES;
320 *pos++ = supp_rates_len;
321
322 count = 0;
323 for (i = 0; i < sband->n_bitrates; i++) {
324 if (BIT(i) & rates) {
325 int rate = sband->bitrates[i].bitrate;
326 *pos++ = (u8) (rate / 5);
327 if (++count == 8)
328 break;
329 }
330 }
331
332 if (rates_len > count) {
333 pos = skb_put(skb, rates_len - count + 2);
334 *pos++ = WLAN_EID_EXT_SUPP_RATES;
335 *pos++ = rates_len - count;
336
337 for (i++; i < sband->n_bitrates; i++) {
338 if (BIT(i) & rates) {
339 int rate = sband->bitrates[i].bitrate;
340 *pos++ = (u8) (rate / 5);
341 }
342 }
343 }
344
345 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
346 /* 1. power capabilities */
347 pos = skb_put(skb, 4);
348 *pos++ = WLAN_EID_PWR_CAPABILITY;
349 *pos++ = 2;
350 *pos++ = 0; /* min tx power */
351 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
352
353 /* 2. supported channels */
354 /* TODO: get this in reg domain format */
355 pos = skb_put(skb, 2 * sband->n_channels + 2);
356 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
357 *pos++ = 2 * sband->n_channels;
358 for (i = 0; i < sband->n_channels; i++) {
359 *pos++ = ieee80211_frequency_to_channel(
360 sband->channels[i].center_freq);
361 *pos++ = 1; /* one channel in the subband*/
362 }
363 }
364
365 if (wk->ie_len && wk->ie) {
366 pos = skb_put(skb, wk->ie_len);
367 memcpy(pos, wk->ie, wk->ie_len);
368 }
369
370 if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED)) {
371 pos = skb_put(skb, 9);
372 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
373 *pos++ = 7; /* len */
374 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
375 *pos++ = 0x50;
376 *pos++ = 0xf2;
377 *pos++ = 2; /* WME */
378 *pos++ = 0; /* WME info */
379 *pos++ = 1; /* WME ver */
380 *pos++ = 0;
381 }
382
383 /* wmm support is a must to HT */
384 /*
385 * IEEE802.11n does not allow TKIP/WEP as pairwise
386 * ciphers in HT mode. We still associate in non-ht
387 * mode (11a/b/g) if any one of these ciphers is
388 * configured as pairwise.
389 */
390 if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
391 sband->ht_cap.ht_supported &&
392 (ht_ie = ieee80211_bss_get_ie(&wk->bss->cbss, WLAN_EID_HT_INFORMATION)) &&
393 ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
394 (!(ifmgd->flags & IEEE80211_STA_DISABLE_11N))) {
395 struct ieee80211_ht_info *ht_info =
396 (struct ieee80211_ht_info *)(ht_ie + 2);
397 u16 cap = sband->ht_cap.cap;
398 __le16 tmp;
399 u32 flags = local->hw.conf.channel->flags;
400
401 /* determine capability flags */
402
403 if (ieee80211_disable_40mhz_24ghz &&
404 sband->band == IEEE80211_BAND_2GHZ) {
405 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
406 cap &= ~IEEE80211_HT_CAP_SGI_40;
407 }
408
409 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
410 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
411 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
412 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
413 cap &= ~IEEE80211_HT_CAP_SGI_40;
414 }
415 break;
416 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
417 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
418 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
419 cap &= ~IEEE80211_HT_CAP_SGI_40;
420 }
421 break;
422 }
423
424 /* set SM PS mode properly */
425 cap &= ~IEEE80211_HT_CAP_SM_PS;
426 /* new association always uses requested smps mode */
427 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
428 if (ifmgd->powersave)
429 ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
430 else
431 ifmgd->ap_smps = IEEE80211_SMPS_OFF;
432 } else
433 ifmgd->ap_smps = ifmgd->req_smps;
434
435 switch (ifmgd->ap_smps) {
436 case IEEE80211_SMPS_AUTOMATIC:
437 case IEEE80211_SMPS_NUM_MODES:
438 WARN_ON(1);
439 case IEEE80211_SMPS_OFF:
440 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
441 IEEE80211_HT_CAP_SM_PS_SHIFT;
442 break;
443 case IEEE80211_SMPS_STATIC:
444 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
445 IEEE80211_HT_CAP_SM_PS_SHIFT;
446 break;
447 case IEEE80211_SMPS_DYNAMIC:
448 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
449 IEEE80211_HT_CAP_SM_PS_SHIFT;
450 break;
451 }
452
453 /* reserve and fill IE */
454
455 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
456 *pos++ = WLAN_EID_HT_CAPABILITY;
457 *pos++ = sizeof(struct ieee80211_ht_cap);
458 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
459
460 /* capability flags */
461 tmp = cpu_to_le16(cap);
462 memcpy(pos, &tmp, sizeof(u16));
463 pos += sizeof(u16);
464
465 /* AMPDU parameters */
466 *pos++ = sband->ht_cap.ampdu_factor |
467 (sband->ht_cap.ampdu_density <<
468 IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
469
470 /* MCS set */
471 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
472 pos += sizeof(sband->ht_cap.mcs);
473
474 /* extended capabilities */
475 pos += sizeof(__le16);
476
477 /* BF capabilities */
478 pos += sizeof(__le32);
479
480 /* antenna selection */
481 pos += sizeof(u8);
482 }
483
484 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
485 ieee80211_tx_skb(sdata, skb);
486 }
487
488
489 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
490 const u8 *bssid, u16 stype, u16 reason,
491 void *cookie)
492 {
493 struct ieee80211_local *local = sdata->local;
494 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
495 struct sk_buff *skb;
496 struct ieee80211_mgmt *mgmt;
497
498 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
499 if (!skb) {
500 printk(KERN_DEBUG "%s: failed to allocate buffer for "
501 "deauth/disassoc frame\n", sdata->name);
502 return;
503 }
504 skb_reserve(skb, local->hw.extra_tx_headroom);
505
506 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
507 memset(mgmt, 0, 24);
508 memcpy(mgmt->da, bssid, ETH_ALEN);
509 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
510 memcpy(mgmt->bssid, bssid, ETH_ALEN);
511 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
512 skb_put(skb, 2);
513 /* u.deauth.reason_code == u.disassoc.reason_code */
514 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
515
516 if (stype == IEEE80211_STYPE_DEAUTH)
517 if (cookie)
518 __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
519 else
520 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
521 else
522 if (cookie)
523 __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
524 else
525 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
526 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
527 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
528 ieee80211_tx_skb(sdata, skb);
529 }
530
531 void ieee80211_send_pspoll(struct ieee80211_local *local,
532 struct ieee80211_sub_if_data *sdata)
533 {
534 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
535 struct ieee80211_pspoll *pspoll;
536 struct sk_buff *skb;
537 u16 fc;
538
539 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
540 if (!skb) {
541 printk(KERN_DEBUG "%s: failed to allocate buffer for "
542 "pspoll frame\n", sdata->name);
543 return;
544 }
545 skb_reserve(skb, local->hw.extra_tx_headroom);
546
547 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
548 memset(pspoll, 0, sizeof(*pspoll));
549 fc = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL | IEEE80211_FCTL_PM;
550 pspoll->frame_control = cpu_to_le16(fc);
551 pspoll->aid = cpu_to_le16(ifmgd->aid);
552
553 /* aid in PS-Poll has its two MSBs each set to 1 */
554 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
555
556 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
557 memcpy(pspoll->ta, sdata->vif.addr, ETH_ALEN);
558
559 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
560 ieee80211_tx_skb(sdata, skb);
561 }
562
563 void ieee80211_send_nullfunc(struct ieee80211_local *local,
564 struct ieee80211_sub_if_data *sdata,
565 int powersave)
566 {
567 struct sk_buff *skb;
568 struct ieee80211_hdr *nullfunc;
569 __le16 fc;
570
571 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
572 return;
573
574 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
575 if (!skb) {
576 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
577 "frame\n", sdata->name);
578 return;
579 }
580 skb_reserve(skb, local->hw.extra_tx_headroom);
581
582 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
583 memset(nullfunc, 0, 24);
584 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
585 IEEE80211_FCTL_TODS);
586 if (powersave)
587 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
588 nullfunc->frame_control = fc;
589 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
590 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
591 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
592
593 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
594 ieee80211_tx_skb(sdata, skb);
595 }
596
597 /* spectrum management related things */
598 static void ieee80211_chswitch_work(struct work_struct *work)
599 {
600 struct ieee80211_sub_if_data *sdata =
601 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
602 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
603
604 if (!netif_running(sdata->dev))
605 return;
606
607 mutex_lock(&ifmgd->mtx);
608 if (!ifmgd->associated)
609 goto out;
610
611 sdata->local->oper_channel = sdata->local->csa_channel;
612 ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL);
613
614 /* XXX: shouldn't really modify cfg80211-owned data! */
615 ifmgd->associated->cbss.channel = sdata->local->oper_channel;
616
617 ieee80211_wake_queues_by_reason(&sdata->local->hw,
618 IEEE80211_QUEUE_STOP_REASON_CSA);
619 out:
620 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
621 mutex_unlock(&ifmgd->mtx);
622 }
623
624 static void ieee80211_chswitch_timer(unsigned long data)
625 {
626 struct ieee80211_sub_if_data *sdata =
627 (struct ieee80211_sub_if_data *) data;
628 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
629
630 if (sdata->local->quiescing) {
631 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
632 return;
633 }
634
635 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
636 }
637
638 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
639 struct ieee80211_channel_sw_ie *sw_elem,
640 struct ieee80211_bss *bss)
641 {
642 struct ieee80211_channel *new_ch;
643 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
644 int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
645
646 ASSERT_MGD_MTX(ifmgd);
647
648 if (!ifmgd->associated)
649 return;
650
651 if (sdata->local->scanning)
652 return;
653
654 /* Disregard subsequent beacons if we are already running a timer
655 processing a CSA */
656
657 if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
658 return;
659
660 new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
661 if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
662 return;
663
664 sdata->local->csa_channel = new_ch;
665
666 if (sw_elem->count <= 1) {
667 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
668 } else {
669 ieee80211_stop_queues_by_reason(&sdata->local->hw,
670 IEEE80211_QUEUE_STOP_REASON_CSA);
671 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
672 mod_timer(&ifmgd->chswitch_timer,
673 jiffies +
674 msecs_to_jiffies(sw_elem->count *
675 bss->cbss.beacon_interval));
676 }
677 }
678
679 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
680 u16 capab_info, u8 *pwr_constr_elem,
681 u8 pwr_constr_elem_len)
682 {
683 struct ieee80211_conf *conf = &sdata->local->hw.conf;
684
685 if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
686 return;
687
688 /* Power constraint IE length should be 1 octet */
689 if (pwr_constr_elem_len != 1)
690 return;
691
692 if ((*pwr_constr_elem <= conf->channel->max_power) &&
693 (*pwr_constr_elem != sdata->local->power_constr_level)) {
694 sdata->local->power_constr_level = *pwr_constr_elem;
695 ieee80211_hw_config(sdata->local, 0);
696 }
697 }
698
699 /* powersave */
700 static void ieee80211_enable_ps(struct ieee80211_local *local,
701 struct ieee80211_sub_if_data *sdata)
702 {
703 struct ieee80211_conf *conf = &local->hw.conf;
704
705 /*
706 * If we are scanning right now then the parameters will
707 * take effect when scan finishes.
708 */
709 if (local->scanning)
710 return;
711
712 if (conf->dynamic_ps_timeout > 0 &&
713 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
714 mod_timer(&local->dynamic_ps_timer, jiffies +
715 msecs_to_jiffies(conf->dynamic_ps_timeout));
716 } else {
717 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
718 ieee80211_send_nullfunc(local, sdata, 1);
719 conf->flags |= IEEE80211_CONF_PS;
720 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
721 }
722 }
723
724 static void ieee80211_change_ps(struct ieee80211_local *local)
725 {
726 struct ieee80211_conf *conf = &local->hw.conf;
727
728 if (local->ps_sdata) {
729 ieee80211_enable_ps(local, local->ps_sdata);
730 } else if (conf->flags & IEEE80211_CONF_PS) {
731 conf->flags &= ~IEEE80211_CONF_PS;
732 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
733 del_timer_sync(&local->dynamic_ps_timer);
734 cancel_work_sync(&local->dynamic_ps_enable_work);
735 }
736 }
737
738 /* need to hold RTNL or interface lock */
739 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
740 {
741 struct ieee80211_sub_if_data *sdata, *found = NULL;
742 int count = 0;
743
744 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
745 local->ps_sdata = NULL;
746 return;
747 }
748
749 list_for_each_entry(sdata, &local->interfaces, list) {
750 if (!netif_running(sdata->dev))
751 continue;
752 if (sdata->vif.type != NL80211_IFTYPE_STATION)
753 continue;
754 found = sdata;
755 count++;
756 }
757
758 if (count == 1 && found->u.mgd.powersave &&
759 found->u.mgd.associated && list_empty(&found->u.mgd.work_list) &&
760 !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
761 IEEE80211_STA_CONNECTION_POLL))) {
762 s32 beaconint_us;
763
764 if (latency < 0)
765 latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
766
767 beaconint_us = ieee80211_tu_to_usec(
768 found->vif.bss_conf.beacon_int);
769
770 if (beaconint_us > latency) {
771 local->ps_sdata = NULL;
772 } else {
773 u8 dtimper = found->vif.bss_conf.dtim_period;
774 int maxslp = 1;
775
776 if (dtimper > 1)
777 maxslp = min_t(int, dtimper,
778 latency / beaconint_us);
779
780 local->hw.conf.max_sleep_period = maxslp;
781 local->ps_sdata = found;
782 }
783 } else {
784 local->ps_sdata = NULL;
785 }
786
787 ieee80211_change_ps(local);
788 }
789
790 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
791 {
792 struct ieee80211_local *local =
793 container_of(work, struct ieee80211_local,
794 dynamic_ps_disable_work);
795
796 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
797 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
798 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
799 }
800
801 ieee80211_wake_queues_by_reason(&local->hw,
802 IEEE80211_QUEUE_STOP_REASON_PS);
803 }
804
805 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
806 {
807 struct ieee80211_local *local =
808 container_of(work, struct ieee80211_local,
809 dynamic_ps_enable_work);
810 struct ieee80211_sub_if_data *sdata = local->ps_sdata;
811
812 /* can only happen when PS was just disabled anyway */
813 if (!sdata)
814 return;
815
816 if (local->hw.conf.flags & IEEE80211_CONF_PS)
817 return;
818
819 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
820 ieee80211_send_nullfunc(local, sdata, 1);
821
822 local->hw.conf.flags |= IEEE80211_CONF_PS;
823 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
824 }
825
826 void ieee80211_dynamic_ps_timer(unsigned long data)
827 {
828 struct ieee80211_local *local = (void *) data;
829
830 if (local->quiescing || local->suspended)
831 return;
832
833 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
834 }
835
836 /* MLME */
837 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
838 struct ieee80211_if_managed *ifmgd,
839 u8 *wmm_param, size_t wmm_param_len)
840 {
841 struct ieee80211_tx_queue_params params;
842 size_t left;
843 int count;
844 u8 *pos;
845
846 if (!(ifmgd->flags & IEEE80211_STA_WMM_ENABLED))
847 return;
848
849 if (!wmm_param)
850 return;
851
852 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
853 return;
854 count = wmm_param[6] & 0x0f;
855 if (count == ifmgd->wmm_last_param_set)
856 return;
857 ifmgd->wmm_last_param_set = count;
858
859 pos = wmm_param + 8;
860 left = wmm_param_len - 8;
861
862 memset(&params, 0, sizeof(params));
863
864 local->wmm_acm = 0;
865 for (; left >= 4; left -= 4, pos += 4) {
866 int aci = (pos[0] >> 5) & 0x03;
867 int acm = (pos[0] >> 4) & 0x01;
868 int queue;
869
870 switch (aci) {
871 case 1: /* AC_BK */
872 queue = 3;
873 if (acm)
874 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
875 break;
876 case 2: /* AC_VI */
877 queue = 1;
878 if (acm)
879 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
880 break;
881 case 3: /* AC_VO */
882 queue = 0;
883 if (acm)
884 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
885 break;
886 case 0: /* AC_BE */
887 default:
888 queue = 2;
889 if (acm)
890 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
891 break;
892 }
893
894 params.aifs = pos[0] & 0x0f;
895 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
896 params.cw_min = ecw2cw(pos[1] & 0x0f);
897 params.txop = get_unaligned_le16(pos + 2);
898 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
899 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
900 "cWmin=%d cWmax=%d txop=%d\n",
901 wiphy_name(local->hw.wiphy), queue, aci, acm,
902 params.aifs, params.cw_min, params.cw_max, params.txop);
903 #endif
904 if (drv_conf_tx(local, queue, &params) && local->ops->conf_tx)
905 printk(KERN_DEBUG "%s: failed to set TX queue "
906 "parameters for queue %d\n",
907 wiphy_name(local->hw.wiphy), queue);
908 }
909 }
910
911 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
912 u16 capab, bool erp_valid, u8 erp)
913 {
914 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
915 u32 changed = 0;
916 bool use_protection;
917 bool use_short_preamble;
918 bool use_short_slot;
919
920 if (erp_valid) {
921 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
922 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
923 } else {
924 use_protection = false;
925 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
926 }
927
928 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
929
930 if (use_protection != bss_conf->use_cts_prot) {
931 bss_conf->use_cts_prot = use_protection;
932 changed |= BSS_CHANGED_ERP_CTS_PROT;
933 }
934
935 if (use_short_preamble != bss_conf->use_short_preamble) {
936 bss_conf->use_short_preamble = use_short_preamble;
937 changed |= BSS_CHANGED_ERP_PREAMBLE;
938 }
939
940 if (use_short_slot != bss_conf->use_short_slot) {
941 bss_conf->use_short_slot = use_short_slot;
942 changed |= BSS_CHANGED_ERP_SLOT;
943 }
944
945 return changed;
946 }
947
948 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
949 struct ieee80211_mgd_work *wk,
950 u32 bss_info_changed)
951 {
952 struct ieee80211_local *local = sdata->local;
953 struct ieee80211_bss *bss = wk->bss;
954
955 bss_info_changed |= BSS_CHANGED_ASSOC;
956 /* set timing information */
957 sdata->vif.bss_conf.beacon_int = bss->cbss.beacon_interval;
958 sdata->vif.bss_conf.timestamp = bss->cbss.tsf;
959 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
960
961 bss_info_changed |= BSS_CHANGED_BEACON_INT;
962 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
963 bss->cbss.capability, bss->has_erp_value, bss->erp_value);
964
965 sdata->u.mgd.associated = bss;
966 sdata->u.mgd.old_associate_work = wk;
967 memcpy(sdata->u.mgd.bssid, bss->cbss.bssid, ETH_ALEN);
968
969 /* just to be sure */
970 sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
971 IEEE80211_STA_BEACON_POLL);
972
973 ieee80211_led_assoc(local, 1);
974
975 sdata->vif.bss_conf.assoc = 1;
976 /*
977 * For now just always ask the driver to update the basic rateset
978 * when we have associated, we aren't checking whether it actually
979 * changed or not.
980 */
981 bss_info_changed |= BSS_CHANGED_BASIC_RATES;
982
983 /* And the BSSID changed - we're associated now */
984 bss_info_changed |= BSS_CHANGED_BSSID;
985
986 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
987
988 mutex_lock(&local->iflist_mtx);
989 ieee80211_recalc_ps(local, -1);
990 ieee80211_recalc_smps(local, sdata);
991 mutex_unlock(&local->iflist_mtx);
992
993 netif_start_queue(sdata->dev);
994 netif_carrier_on(sdata->dev);
995 }
996
997 static enum rx_mgmt_action __must_check
998 ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
999 struct ieee80211_mgd_work *wk)
1000 {
1001 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1002 struct ieee80211_local *local = sdata->local;
1003
1004 wk->tries++;
1005 if (wk->tries > IEEE80211_AUTH_MAX_TRIES) {
1006 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
1007 sdata->name, wk->bss->cbss.bssid);
1008
1009 /*
1010 * Most likely AP is not in the range so remove the
1011 * bss struct for that AP.
1012 */
1013 cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
1014
1015 /*
1016 * We might have a pending scan which had no chance to run yet
1017 * due to work needing to be done. Hence, queue the STAs work
1018 * again for that.
1019 */
1020 ieee80211_queue_work(&local->hw, &ifmgd->work);
1021 return RX_MGMT_CFG80211_AUTH_TO;
1022 }
1023
1024 printk(KERN_DEBUG "%s: direct probe to AP %pM (try %d)\n",
1025 sdata->name, wk->bss->cbss.bssid,
1026 wk->tries);
1027
1028 /*
1029 * Direct probe is sent to broadcast address as some APs
1030 * will not answer to direct packet in unassociated state.
1031 */
1032 ieee80211_send_probe_req(sdata, NULL, wk->ssid, wk->ssid_len, NULL, 0);
1033
1034 wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
1035 run_again(ifmgd, wk->timeout);
1036
1037 return RX_MGMT_NONE;
1038 }
1039
1040
1041 static enum rx_mgmt_action __must_check
1042 ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
1043 struct ieee80211_mgd_work *wk)
1044 {
1045 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1046 struct ieee80211_local *local = sdata->local;
1047
1048 wk->tries++;
1049 if (wk->tries > IEEE80211_AUTH_MAX_TRIES) {
1050 printk(KERN_DEBUG "%s: authentication with AP %pM"
1051 " timed out\n",
1052 sdata->name, wk->bss->cbss.bssid);
1053
1054 /*
1055 * Most likely AP is not in the range so remove the
1056 * bss struct for that AP.
1057 */
1058 cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
1059
1060 /*
1061 * We might have a pending scan which had no chance to run yet
1062 * due to work needing to be done. Hence, queue the STAs work
1063 * again for that.
1064 */
1065 ieee80211_queue_work(&local->hw, &ifmgd->work);
1066 return RX_MGMT_CFG80211_AUTH_TO;
1067 }
1068
1069 printk(KERN_DEBUG "%s: authenticate with AP %pM (try %d)\n",
1070 sdata->name, wk->bss->cbss.bssid, wk->tries);
1071
1072 ieee80211_send_auth(sdata, 1, wk->auth_alg, wk->ie, wk->ie_len,
1073 wk->bss->cbss.bssid, NULL, 0, 0);
1074 wk->auth_transaction = 2;
1075
1076 wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
1077 run_again(ifmgd, wk->timeout);
1078
1079 return RX_MGMT_NONE;
1080 }
1081
1082 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1083 bool deauth)
1084 {
1085 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1086 struct ieee80211_local *local = sdata->local;
1087 struct sta_info *sta;
1088 u32 changed = 0, config_changed = 0;
1089 u8 bssid[ETH_ALEN];
1090
1091 ASSERT_MGD_MTX(ifmgd);
1092
1093 if (WARN_ON(!ifmgd->associated))
1094 return;
1095
1096 memcpy(bssid, ifmgd->associated->cbss.bssid, ETH_ALEN);
1097
1098 ifmgd->associated = NULL;
1099 memset(ifmgd->bssid, 0, ETH_ALEN);
1100
1101 if (deauth) {
1102 kfree(ifmgd->old_associate_work);
1103 ifmgd->old_associate_work = NULL;
1104 } else {
1105 struct ieee80211_mgd_work *wk = ifmgd->old_associate_work;
1106
1107 wk->state = IEEE80211_MGD_STATE_IDLE;
1108 list_add(&wk->list, &ifmgd->work_list);
1109 }
1110
1111 /*
1112 * we need to commit the associated = NULL change because the
1113 * scan code uses that to determine whether this iface should
1114 * go to/wake up from powersave or not -- and could otherwise
1115 * wake the queues erroneously.
1116 */
1117 smp_mb();
1118
1119 /*
1120 * Thus, we can only afterwards stop the queues -- to account
1121 * for the case where another CPU is finishing a scan at this
1122 * time -- we don't want the scan code to enable queues.
1123 */
1124
1125 netif_stop_queue(sdata->dev);
1126 netif_carrier_off(sdata->dev);
1127
1128 rcu_read_lock();
1129 sta = sta_info_get(sdata, bssid);
1130 if (sta)
1131 ieee80211_sta_tear_down_BA_sessions(sta);
1132 rcu_read_unlock();
1133
1134 changed |= ieee80211_reset_erp_info(sdata);
1135
1136 ieee80211_led_assoc(local, 0);
1137 changed |= BSS_CHANGED_ASSOC;
1138 sdata->vif.bss_conf.assoc = false;
1139
1140 ieee80211_set_wmm_default(sdata);
1141
1142 ieee80211_recalc_idle(local);
1143
1144 /* channel(_type) changes are handled by ieee80211_hw_config */
1145 local->oper_channel_type = NL80211_CHAN_NO_HT;
1146
1147 /* on the next assoc, re-program HT parameters */
1148 sdata->ht_opmode_valid = false;
1149
1150 local->power_constr_level = 0;
1151
1152 del_timer_sync(&local->dynamic_ps_timer);
1153 cancel_work_sync(&local->dynamic_ps_enable_work);
1154
1155 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1156 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1157 config_changed |= IEEE80211_CONF_CHANGE_PS;
1158 }
1159
1160 ieee80211_hw_config(local, config_changed);
1161
1162 /* And the BSSID changed -- not very interesting here */
1163 changed |= BSS_CHANGED_BSSID;
1164 ieee80211_bss_info_change_notify(sdata, changed);
1165
1166 rcu_read_lock();
1167
1168 sta = sta_info_get(sdata, bssid);
1169 if (!sta) {
1170 rcu_read_unlock();
1171 return;
1172 }
1173
1174 sta_info_unlink(&sta);
1175
1176 rcu_read_unlock();
1177
1178 sta_info_destroy(sta);
1179 }
1180
1181 static enum rx_mgmt_action __must_check
1182 ieee80211_associate(struct ieee80211_sub_if_data *sdata,
1183 struct ieee80211_mgd_work *wk)
1184 {
1185 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1186 struct ieee80211_local *local = sdata->local;
1187
1188 wk->tries++;
1189 if (wk->tries > IEEE80211_ASSOC_MAX_TRIES) {
1190 printk(KERN_DEBUG "%s: association with AP %pM"
1191 " timed out\n",
1192 sdata->name, wk->bss->cbss.bssid);
1193
1194 /*
1195 * Most likely AP is not in the range so remove the
1196 * bss struct for that AP.
1197 */
1198 cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
1199
1200 /*
1201 * We might have a pending scan which had no chance to run yet
1202 * due to work needing to be done. Hence, queue the STAs work
1203 * again for that.
1204 */
1205 ieee80211_queue_work(&local->hw, &ifmgd->work);
1206 return RX_MGMT_CFG80211_ASSOC_TO;
1207 }
1208
1209 printk(KERN_DEBUG "%s: associate with AP %pM (try %d)\n",
1210 sdata->name, wk->bss->cbss.bssid, wk->tries);
1211 ieee80211_send_assoc(sdata, wk);
1212
1213 wk->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
1214 run_again(ifmgd, wk->timeout);
1215
1216 return RX_MGMT_NONE;
1217 }
1218
1219 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1220 struct ieee80211_hdr *hdr)
1221 {
1222 /*
1223 * We can postpone the mgd.timer whenever receiving unicast frames
1224 * from AP because we know that the connection is working both ways
1225 * at that time. But multicast frames (and hence also beacons) must
1226 * be ignored here, because we need to trigger the timer during
1227 * data idle periods for sending the periodic probe request to the
1228 * AP we're connected to.
1229 */
1230 if (is_multicast_ether_addr(hdr->addr1))
1231 return;
1232
1233 mod_timer(&sdata->u.mgd.conn_mon_timer,
1234 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
1235 }
1236
1237 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1238 {
1239 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1240 const u8 *ssid;
1241
1242 ssid = ieee80211_bss_get_ie(&ifmgd->associated->cbss, WLAN_EID_SSID);
1243 ieee80211_send_probe_req(sdata, ifmgd->associated->cbss.bssid,
1244 ssid + 2, ssid[1], NULL, 0);
1245
1246 ifmgd->probe_send_count++;
1247 ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
1248 run_again(ifmgd, ifmgd->probe_timeout);
1249 }
1250
1251 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1252 bool beacon)
1253 {
1254 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1255 bool already = false;
1256
1257 if (!netif_running(sdata->dev))
1258 return;
1259
1260 if (sdata->local->scanning)
1261 return;
1262
1263 mutex_lock(&ifmgd->mtx);
1264
1265 if (!ifmgd->associated)
1266 goto out;
1267
1268 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1269 if (beacon && net_ratelimit())
1270 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1271 "- sending probe request\n", sdata->name);
1272 #endif
1273
1274 /*
1275 * The driver/our work has already reported this event or the
1276 * connection monitoring has kicked in and we have already sent
1277 * a probe request. Or maybe the AP died and the driver keeps
1278 * reporting until we disassociate...
1279 *
1280 * In either case we have to ignore the current call to this
1281 * function (except for setting the correct probe reason bit)
1282 * because otherwise we would reset the timer every time and
1283 * never check whether we received a probe response!
1284 */
1285 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1286 IEEE80211_STA_CONNECTION_POLL))
1287 already = true;
1288
1289 if (beacon)
1290 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1291 else
1292 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1293
1294 if (already)
1295 goto out;
1296
1297 mutex_lock(&sdata->local->iflist_mtx);
1298 ieee80211_recalc_ps(sdata->local, -1);
1299 mutex_unlock(&sdata->local->iflist_mtx);
1300
1301 ifmgd->probe_send_count = 0;
1302 ieee80211_mgd_probe_ap_send(sdata);
1303 out:
1304 mutex_unlock(&ifmgd->mtx);
1305 }
1306
1307 void ieee80211_beacon_loss_work(struct work_struct *work)
1308 {
1309 struct ieee80211_sub_if_data *sdata =
1310 container_of(work, struct ieee80211_sub_if_data,
1311 u.mgd.beacon_loss_work);
1312
1313 ieee80211_mgd_probe_ap(sdata, true);
1314 }
1315
1316 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1317 {
1318 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1319
1320 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
1321 }
1322 EXPORT_SYMBOL(ieee80211_beacon_loss);
1323
1324 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1325 struct ieee80211_mgd_work *wk)
1326 {
1327 wk->state = IEEE80211_MGD_STATE_IDLE;
1328 printk(KERN_DEBUG "%s: authenticated\n", sdata->name);
1329 }
1330
1331
1332 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1333 struct ieee80211_mgd_work *wk,
1334 struct ieee80211_mgmt *mgmt,
1335 size_t len)
1336 {
1337 u8 *pos;
1338 struct ieee802_11_elems elems;
1339
1340 pos = mgmt->u.auth.variable;
1341 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1342 if (!elems.challenge)
1343 return;
1344 ieee80211_send_auth(sdata, 3, wk->auth_alg,
1345 elems.challenge - 2, elems.challenge_len + 2,
1346 wk->bss->cbss.bssid,
1347 wk->key, wk->key_len, wk->key_idx);
1348 wk->auth_transaction = 4;
1349 }
1350
1351 static enum rx_mgmt_action __must_check
1352 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1353 struct ieee80211_mgd_work *wk,
1354 struct ieee80211_mgmt *mgmt, size_t len)
1355 {
1356 u16 auth_alg, auth_transaction, status_code;
1357
1358 if (wk->state != IEEE80211_MGD_STATE_AUTH)
1359 return RX_MGMT_NONE;
1360
1361 if (len < 24 + 6)
1362 return RX_MGMT_NONE;
1363
1364 if (memcmp(wk->bss->cbss.bssid, mgmt->sa, ETH_ALEN) != 0)
1365 return RX_MGMT_NONE;
1366
1367 if (memcmp(wk->bss->cbss.bssid, mgmt->bssid, ETH_ALEN) != 0)
1368 return RX_MGMT_NONE;
1369
1370 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1371 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1372 status_code = le16_to_cpu(mgmt->u.auth.status_code);
1373
1374 if (auth_alg != wk->auth_alg ||
1375 auth_transaction != wk->auth_transaction)
1376 return RX_MGMT_NONE;
1377
1378 if (status_code != WLAN_STATUS_SUCCESS) {
1379 list_del(&wk->list);
1380 kfree(wk);
1381 return RX_MGMT_CFG80211_AUTH;
1382 }
1383
1384 switch (wk->auth_alg) {
1385 case WLAN_AUTH_OPEN:
1386 case WLAN_AUTH_LEAP:
1387 case WLAN_AUTH_FT:
1388 ieee80211_auth_completed(sdata, wk);
1389 return RX_MGMT_CFG80211_AUTH;
1390 case WLAN_AUTH_SHARED_KEY:
1391 if (wk->auth_transaction == 4) {
1392 ieee80211_auth_completed(sdata, wk);
1393 return RX_MGMT_CFG80211_AUTH;
1394 } else
1395 ieee80211_auth_challenge(sdata, wk, mgmt, len);
1396 break;
1397 }
1398
1399 return RX_MGMT_NONE;
1400 }
1401
1402
1403 static enum rx_mgmt_action __must_check
1404 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1405 struct ieee80211_mgd_work *wk,
1406 struct ieee80211_mgmt *mgmt, size_t len)
1407 {
1408 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1409 const u8 *bssid = NULL;
1410 u16 reason_code;
1411
1412 if (len < 24 + 2)
1413 return RX_MGMT_NONE;
1414
1415 ASSERT_MGD_MTX(ifmgd);
1416
1417 if (wk)
1418 bssid = wk->bss->cbss.bssid;
1419 else
1420 bssid = ifmgd->associated->cbss.bssid;
1421
1422 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1423
1424 printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1425 sdata->name, bssid, reason_code);
1426
1427 if (!wk) {
1428 ieee80211_set_disassoc(sdata, true);
1429 } else {
1430 list_del(&wk->list);
1431 kfree(wk);
1432 }
1433
1434 return RX_MGMT_CFG80211_DEAUTH;
1435 }
1436
1437
1438 static enum rx_mgmt_action __must_check
1439 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1440 struct ieee80211_mgmt *mgmt, size_t len)
1441 {
1442 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1443 u16 reason_code;
1444
1445 if (len < 24 + 2)
1446 return RX_MGMT_NONE;
1447
1448 ASSERT_MGD_MTX(ifmgd);
1449
1450 if (WARN_ON(!ifmgd->associated))
1451 return RX_MGMT_NONE;
1452
1453 if (WARN_ON(memcmp(ifmgd->associated->cbss.bssid, mgmt->sa, ETH_ALEN)))
1454 return RX_MGMT_NONE;
1455
1456 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1457
1458 printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1459 sdata->name, mgmt->sa, reason_code);
1460
1461 ieee80211_set_disassoc(sdata, false);
1462 return RX_MGMT_CFG80211_DISASSOC;
1463 }
1464
1465
1466 static enum rx_mgmt_action __must_check
1467 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1468 struct ieee80211_mgd_work *wk,
1469 struct ieee80211_mgmt *mgmt, size_t len,
1470 bool reassoc)
1471 {
1472 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1473 struct ieee80211_local *local = sdata->local;
1474 struct ieee80211_supported_band *sband;
1475 struct sta_info *sta;
1476 u32 rates, basic_rates;
1477 u16 capab_info, status_code, aid;
1478 struct ieee802_11_elems elems;
1479 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1480 u8 *pos;
1481 u32 changed = 0;
1482 int i, j;
1483 bool have_higher_than_11mbit = false, newsta = false;
1484 u16 ap_ht_cap_flags;
1485
1486 /*
1487 * AssocResp and ReassocResp have identical structure, so process both
1488 * of them in this function.
1489 */
1490
1491 if (len < 24 + 6)
1492 return RX_MGMT_NONE;
1493
1494 if (memcmp(wk->bss->cbss.bssid, mgmt->sa, ETH_ALEN) != 0)
1495 return RX_MGMT_NONE;
1496
1497 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1498 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1499 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1500
1501 printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1502 "status=%d aid=%d)\n",
1503 sdata->name, reassoc ? "Rea" : "A", mgmt->sa,
1504 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1505
1506 pos = mgmt->u.assoc_resp.variable;
1507 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1508
1509 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1510 elems.timeout_int && elems.timeout_int_len == 5 &&
1511 elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1512 u32 tu, ms;
1513 tu = get_unaligned_le32(elems.timeout_int + 1);
1514 ms = tu * 1024 / 1000;
1515 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1516 "comeback duration %u TU (%u ms)\n",
1517 sdata->name, tu, ms);
1518 wk->timeout = jiffies + msecs_to_jiffies(ms);
1519 if (ms > IEEE80211_ASSOC_TIMEOUT)
1520 run_again(ifmgd, jiffies + msecs_to_jiffies(ms));
1521 return RX_MGMT_NONE;
1522 }
1523
1524 if (status_code != WLAN_STATUS_SUCCESS) {
1525 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1526 sdata->name, status_code);
1527 wk->state = IEEE80211_MGD_STATE_IDLE;
1528 return RX_MGMT_CFG80211_ASSOC;
1529 }
1530
1531 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1532 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1533 "set\n", sdata->name, aid);
1534 aid &= ~(BIT(15) | BIT(14));
1535
1536 if (!elems.supp_rates) {
1537 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1538 sdata->name);
1539 return RX_MGMT_NONE;
1540 }
1541
1542 printk(KERN_DEBUG "%s: associated\n", sdata->name);
1543 ifmgd->aid = aid;
1544
1545 rcu_read_lock();
1546
1547 /* Add STA entry for the AP */
1548 sta = sta_info_get(sdata, wk->bss->cbss.bssid);
1549 if (!sta) {
1550 newsta = true;
1551
1552 rcu_read_unlock();
1553
1554 sta = sta_info_alloc(sdata, wk->bss->cbss.bssid, GFP_KERNEL);
1555 if (!sta) {
1556 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1557 " the AP\n", sdata->name);
1558 return RX_MGMT_NONE;
1559 }
1560
1561 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1562 WLAN_STA_ASSOC_AP);
1563 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1564 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1565
1566 rcu_read_lock();
1567 }
1568
1569 rates = 0;
1570 basic_rates = 0;
1571 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1572
1573 for (i = 0; i < elems.supp_rates_len; i++) {
1574 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1575 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1576
1577 if (rate > 110)
1578 have_higher_than_11mbit = true;
1579
1580 for (j = 0; j < sband->n_bitrates; j++) {
1581 if (sband->bitrates[j].bitrate == rate) {
1582 rates |= BIT(j);
1583 if (is_basic)
1584 basic_rates |= BIT(j);
1585 break;
1586 }
1587 }
1588 }
1589
1590 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1591 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1592 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1593
1594 if (rate > 110)
1595 have_higher_than_11mbit = true;
1596
1597 for (j = 0; j < sband->n_bitrates; j++) {
1598 if (sband->bitrates[j].bitrate == rate) {
1599 rates |= BIT(j);
1600 if (is_basic)
1601 basic_rates |= BIT(j);
1602 break;
1603 }
1604 }
1605 }
1606
1607 sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1608 sdata->vif.bss_conf.basic_rates = basic_rates;
1609
1610 /* cf. IEEE 802.11 9.2.12 */
1611 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1612 have_higher_than_11mbit)
1613 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1614 else
1615 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1616
1617 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1618 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1619 elems.ht_cap_elem, &sta->sta.ht_cap);
1620
1621 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1622
1623 rate_control_rate_init(sta);
1624
1625 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1626 set_sta_flags(sta, WLAN_STA_MFP);
1627
1628 if (elems.wmm_param)
1629 set_sta_flags(sta, WLAN_STA_WME);
1630
1631 if (newsta) {
1632 int err = sta_info_insert(sta);
1633 if (err) {
1634 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1635 " the AP (error %d)\n", sdata->name, err);
1636 rcu_read_unlock();
1637 return RX_MGMT_NONE;
1638 }
1639 }
1640
1641 rcu_read_unlock();
1642
1643 if (elems.wmm_param)
1644 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1645 elems.wmm_param_len);
1646 else
1647 ieee80211_set_wmm_default(sdata);
1648
1649 if (elems.ht_info_elem && elems.wmm_param &&
1650 (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
1651 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1652 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1653 wk->bss->cbss.bssid,
1654 ap_ht_cap_flags);
1655
1656 /* delete work item -- must be before set_associated for PS */
1657 list_del(&wk->list);
1658
1659 /* set AID and assoc capability,
1660 * ieee80211_set_associated() will tell the driver */
1661 bss_conf->aid = aid;
1662 bss_conf->assoc_capability = capab_info;
1663 /* this will take ownership of wk */
1664 ieee80211_set_associated(sdata, wk, changed);
1665
1666 /*
1667 * Start timer to probe the connection to the AP now.
1668 * Also start the timer that will detect beacon loss.
1669 */
1670 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1671 mod_beacon_timer(sdata);
1672
1673 return RX_MGMT_CFG80211_ASSOC;
1674 }
1675
1676
1677 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1678 struct ieee80211_mgmt *mgmt,
1679 size_t len,
1680 struct ieee80211_rx_status *rx_status,
1681 struct ieee802_11_elems *elems,
1682 bool beacon)
1683 {
1684 struct ieee80211_local *local = sdata->local;
1685 int freq;
1686 struct ieee80211_bss *bss;
1687 struct ieee80211_channel *channel;
1688
1689 if (elems->ds_params && elems->ds_params_len == 1)
1690 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1691 else
1692 freq = rx_status->freq;
1693
1694 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1695
1696 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1697 return;
1698
1699 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1700 channel, beacon);
1701 if (bss)
1702 ieee80211_rx_bss_put(local, bss);
1703
1704 if (!sdata->u.mgd.associated)
1705 return;
1706
1707 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1708 (memcmp(mgmt->bssid, sdata->u.mgd.associated->cbss.bssid,
1709 ETH_ALEN) == 0)) {
1710 struct ieee80211_channel_sw_ie *sw_elem =
1711 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1712 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1713 }
1714 }
1715
1716
1717 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1718 struct ieee80211_mgd_work *wk,
1719 struct ieee80211_mgmt *mgmt, size_t len,
1720 struct ieee80211_rx_status *rx_status)
1721 {
1722 struct ieee80211_if_managed *ifmgd;
1723 size_t baselen;
1724 struct ieee802_11_elems elems;
1725
1726 ifmgd = &sdata->u.mgd;
1727
1728 ASSERT_MGD_MTX(ifmgd);
1729
1730 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1731 return; /* ignore ProbeResp to foreign address */
1732
1733 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1734 if (baselen > len)
1735 return;
1736
1737 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1738 &elems);
1739
1740 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1741
1742 /* direct probe may be part of the association flow */
1743 if (wk && wk->state == IEEE80211_MGD_STATE_PROBE) {
1744 printk(KERN_DEBUG "%s: direct probe responded\n",
1745 sdata->name);
1746 wk->tries = 0;
1747 wk->state = IEEE80211_MGD_STATE_AUTH;
1748 WARN_ON(ieee80211_authenticate(sdata, wk) != RX_MGMT_NONE);
1749 }
1750
1751 if (ifmgd->associated &&
1752 memcmp(mgmt->bssid, ifmgd->associated->cbss.bssid, ETH_ALEN) == 0 &&
1753 ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1754 IEEE80211_STA_CONNECTION_POLL)) {
1755 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1756 IEEE80211_STA_BEACON_POLL);
1757 mutex_lock(&sdata->local->iflist_mtx);
1758 ieee80211_recalc_ps(sdata->local, -1);
1759 mutex_unlock(&sdata->local->iflist_mtx);
1760 /*
1761 * We've received a probe response, but are not sure whether
1762 * we have or will be receiving any beacons or data, so let's
1763 * schedule the timers again, just in case.
1764 */
1765 mod_beacon_timer(sdata);
1766 mod_timer(&ifmgd->conn_mon_timer,
1767 round_jiffies_up(jiffies +
1768 IEEE80211_CONNECTION_IDLE_TIME));
1769 }
1770 }
1771
1772 /*
1773 * This is the canonical list of information elements we care about,
1774 * the filter code also gives us all changes to the Microsoft OUI
1775 * (00:50:F2) vendor IE which is used for WMM which we need to track.
1776 *
1777 * We implement beacon filtering in software since that means we can
1778 * avoid processing the frame here and in cfg80211, and userspace
1779 * will not be able to tell whether the hardware supports it or not.
1780 *
1781 * XXX: This list needs to be dynamic -- userspace needs to be able to
1782 * add items it requires. It also needs to be able to tell us to
1783 * look out for other vendor IEs.
1784 */
1785 static const u64 care_about_ies =
1786 (1ULL << WLAN_EID_COUNTRY) |
1787 (1ULL << WLAN_EID_ERP_INFO) |
1788 (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1789 (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1790 (1ULL << WLAN_EID_HT_CAPABILITY) |
1791 (1ULL << WLAN_EID_HT_INFORMATION);
1792
1793 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1794 struct ieee80211_mgmt *mgmt,
1795 size_t len,
1796 struct ieee80211_rx_status *rx_status)
1797 {
1798 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1799 size_t baselen;
1800 struct ieee802_11_elems elems;
1801 struct ieee80211_local *local = sdata->local;
1802 u32 changed = 0;
1803 bool erp_valid, directed_tim = false;
1804 u8 erp_value = 0;
1805 u32 ncrc;
1806 u8 *bssid;
1807
1808 ASSERT_MGD_MTX(ifmgd);
1809
1810 /* Process beacon from the current BSS */
1811 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1812 if (baselen > len)
1813 return;
1814
1815 if (rx_status->freq != local->hw.conf.channel->center_freq)
1816 return;
1817
1818 /*
1819 * We might have received a number of frames, among them a
1820 * disassoc frame and a beacon...
1821 */
1822 if (!ifmgd->associated)
1823 return;
1824
1825 bssid = ifmgd->associated->cbss.bssid;
1826
1827 /*
1828 * And in theory even frames from a different AP we were just
1829 * associated to a split-second ago!
1830 */
1831 if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1832 return;
1833
1834 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1835 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1836 if (net_ratelimit()) {
1837 printk(KERN_DEBUG "%s: cancelling probereq poll due "
1838 "to a received beacon\n", sdata->name);
1839 }
1840 #endif
1841 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1842 mutex_lock(&local->iflist_mtx);
1843 ieee80211_recalc_ps(local, -1);
1844 mutex_unlock(&local->iflist_mtx);
1845 }
1846
1847 /*
1848 * Push the beacon loss detection into the future since
1849 * we are processing a beacon from the AP just now.
1850 */
1851 mod_beacon_timer(sdata);
1852
1853 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1854 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1855 len - baselen, &elems,
1856 care_about_ies, ncrc);
1857
1858 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1859 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1860 ifmgd->aid);
1861
1862 if (ncrc != ifmgd->beacon_crc) {
1863 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1864 true);
1865
1866 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1867 elems.wmm_param_len);
1868 }
1869
1870 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1871 if (directed_tim) {
1872 if (local->hw.conf.dynamic_ps_timeout > 0) {
1873 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1874 ieee80211_hw_config(local,
1875 IEEE80211_CONF_CHANGE_PS);
1876 ieee80211_send_nullfunc(local, sdata, 0);
1877 } else {
1878 local->pspolling = true;
1879
1880 /*
1881 * Here is assumed that the driver will be
1882 * able to send ps-poll frame and receive a
1883 * response even though power save mode is
1884 * enabled, but some drivers might require
1885 * to disable power save here. This needs
1886 * to be investigated.
1887 */
1888 ieee80211_send_pspoll(local, sdata);
1889 }
1890 }
1891 }
1892
1893 if (ncrc == ifmgd->beacon_crc)
1894 return;
1895 ifmgd->beacon_crc = ncrc;
1896
1897 if (elems.erp_info && elems.erp_info_len >= 1) {
1898 erp_valid = true;
1899 erp_value = elems.erp_info[0];
1900 } else {
1901 erp_valid = false;
1902 }
1903 changed |= ieee80211_handle_bss_capability(sdata,
1904 le16_to_cpu(mgmt->u.beacon.capab_info),
1905 erp_valid, erp_value);
1906
1907
1908 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1909 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1910 struct sta_info *sta;
1911 struct ieee80211_supported_band *sband;
1912 u16 ap_ht_cap_flags;
1913
1914 rcu_read_lock();
1915
1916 sta = sta_info_get(sdata, bssid);
1917 if (WARN_ON(!sta)) {
1918 rcu_read_unlock();
1919 return;
1920 }
1921
1922 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1923
1924 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1925 elems.ht_cap_elem, &sta->sta.ht_cap);
1926
1927 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1928
1929 rcu_read_unlock();
1930
1931 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1932 bssid, ap_ht_cap_flags);
1933 }
1934
1935 /* Note: country IE parsing is done for us by cfg80211 */
1936 if (elems.country_elem) {
1937 /* TODO: IBSS also needs this */
1938 if (elems.pwr_constr_elem)
1939 ieee80211_handle_pwr_constr(sdata,
1940 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1941 elems.pwr_constr_elem,
1942 elems.pwr_constr_elem_len);
1943 }
1944
1945 ieee80211_bss_info_change_notify(sdata, changed);
1946 }
1947
1948 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1949 struct sk_buff *skb)
1950 {
1951 struct ieee80211_local *local = sdata->local;
1952 struct ieee80211_mgmt *mgmt;
1953 u16 fc;
1954
1955 if (skb->len < 24)
1956 return RX_DROP_MONITOR;
1957
1958 mgmt = (struct ieee80211_mgmt *) skb->data;
1959 fc = le16_to_cpu(mgmt->frame_control);
1960
1961 switch (fc & IEEE80211_FCTL_STYPE) {
1962 case IEEE80211_STYPE_PROBE_RESP:
1963 case IEEE80211_STYPE_BEACON:
1964 case IEEE80211_STYPE_AUTH:
1965 case IEEE80211_STYPE_ASSOC_RESP:
1966 case IEEE80211_STYPE_REASSOC_RESP:
1967 case IEEE80211_STYPE_DEAUTH:
1968 case IEEE80211_STYPE_DISASSOC:
1969 case IEEE80211_STYPE_ACTION:
1970 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1971 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
1972 return RX_QUEUED;
1973 }
1974
1975 return RX_DROP_MONITOR;
1976 }
1977
1978 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1979 struct sk_buff *skb)
1980 {
1981 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1982 struct ieee80211_rx_status *rx_status;
1983 struct ieee80211_mgmt *mgmt;
1984 struct ieee80211_mgd_work *wk;
1985 enum rx_mgmt_action rma = RX_MGMT_NONE;
1986 u16 fc;
1987
1988 rx_status = (struct ieee80211_rx_status *) skb->cb;
1989 mgmt = (struct ieee80211_mgmt *) skb->data;
1990 fc = le16_to_cpu(mgmt->frame_control);
1991
1992 mutex_lock(&ifmgd->mtx);
1993
1994 if (ifmgd->associated &&
1995 memcmp(ifmgd->associated->cbss.bssid, mgmt->bssid,
1996 ETH_ALEN) == 0) {
1997 switch (fc & IEEE80211_FCTL_STYPE) {
1998 case IEEE80211_STYPE_BEACON:
1999 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
2000 rx_status);
2001 break;
2002 case IEEE80211_STYPE_PROBE_RESP:
2003 ieee80211_rx_mgmt_probe_resp(sdata, NULL, mgmt,
2004 skb->len, rx_status);
2005 break;
2006 case IEEE80211_STYPE_DEAUTH:
2007 rma = ieee80211_rx_mgmt_deauth(sdata, NULL,
2008 mgmt, skb->len);
2009 break;
2010 case IEEE80211_STYPE_DISASSOC:
2011 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
2012 break;
2013 case IEEE80211_STYPE_ACTION:
2014 /* XXX: differentiate, can only happen for CSA now! */
2015 ieee80211_sta_process_chanswitch(sdata,
2016 &mgmt->u.action.u.chan_switch.sw_elem,
2017 ifmgd->associated);
2018 break;
2019 }
2020 mutex_unlock(&ifmgd->mtx);
2021
2022 switch (rma) {
2023 case RX_MGMT_NONE:
2024 /* no action */
2025 break;
2026 case RX_MGMT_CFG80211_DEAUTH:
2027 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2028 break;
2029 case RX_MGMT_CFG80211_DISASSOC:
2030 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
2031 break;
2032 default:
2033 WARN(1, "unexpected: %d", rma);
2034 }
2035 goto out;
2036 }
2037
2038 list_for_each_entry(wk, &ifmgd->work_list, list) {
2039 if (memcmp(wk->bss->cbss.bssid, mgmt->bssid, ETH_ALEN) != 0)
2040 continue;
2041
2042 switch (fc & IEEE80211_FCTL_STYPE) {
2043 case IEEE80211_STYPE_PROBE_RESP:
2044 ieee80211_rx_mgmt_probe_resp(sdata, wk, mgmt, skb->len,
2045 rx_status);
2046 break;
2047 case IEEE80211_STYPE_AUTH:
2048 rma = ieee80211_rx_mgmt_auth(sdata, wk, mgmt, skb->len);
2049 break;
2050 case IEEE80211_STYPE_ASSOC_RESP:
2051 rma = ieee80211_rx_mgmt_assoc_resp(sdata, wk, mgmt,
2052 skb->len, false);
2053 break;
2054 case IEEE80211_STYPE_REASSOC_RESP:
2055 rma = ieee80211_rx_mgmt_assoc_resp(sdata, wk, mgmt,
2056 skb->len, true);
2057 break;
2058 case IEEE80211_STYPE_DEAUTH:
2059 rma = ieee80211_rx_mgmt_deauth(sdata, wk, mgmt,
2060 skb->len);
2061 break;
2062 }
2063 /*
2064 * We've processed this frame for that work, so it can't
2065 * belong to another work struct.
2066 * NB: this is also required for correctness because the
2067 * called functions can free 'wk', and for 'rma'!
2068 */
2069 break;
2070 }
2071
2072 mutex_unlock(&ifmgd->mtx);
2073
2074 switch (rma) {
2075 case RX_MGMT_NONE:
2076 /* no action */
2077 break;
2078 case RX_MGMT_CFG80211_AUTH:
2079 cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, skb->len);
2080 break;
2081 case RX_MGMT_CFG80211_ASSOC:
2082 cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, skb->len);
2083 break;
2084 case RX_MGMT_CFG80211_DEAUTH:
2085 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2086 break;
2087 default:
2088 WARN(1, "unexpected: %d", rma);
2089 }
2090
2091 out:
2092 kfree_skb(skb);
2093 }
2094
2095 static void ieee80211_sta_timer(unsigned long data)
2096 {
2097 struct ieee80211_sub_if_data *sdata =
2098 (struct ieee80211_sub_if_data *) data;
2099 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2100 struct ieee80211_local *local = sdata->local;
2101
2102 if (local->quiescing) {
2103 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2104 return;
2105 }
2106
2107 ieee80211_queue_work(&local->hw, &ifmgd->work);
2108 }
2109
2110 static void ieee80211_sta_work(struct work_struct *work)
2111 {
2112 struct ieee80211_sub_if_data *sdata =
2113 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
2114 struct ieee80211_local *local = sdata->local;
2115 struct ieee80211_if_managed *ifmgd;
2116 struct sk_buff *skb;
2117 struct ieee80211_mgd_work *wk, *tmp;
2118 LIST_HEAD(free_work);
2119 enum rx_mgmt_action rma;
2120 bool anybusy = false;
2121
2122 if (!netif_running(sdata->dev))
2123 return;
2124
2125 if (local->scanning)
2126 return;
2127
2128 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2129 return;
2130
2131 /*
2132 * ieee80211_queue_work() should have picked up most cases,
2133 * here we'll pick the the rest.
2134 */
2135 if (WARN(local->suspended, "STA MLME work scheduled while "
2136 "going to suspend\n"))
2137 return;
2138
2139 ifmgd = &sdata->u.mgd;
2140
2141 /* first process frames to avoid timing out while a frame is pending */
2142 while ((skb = skb_dequeue(&ifmgd->skb_queue)))
2143 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2144
2145 /* then process the rest of the work */
2146 mutex_lock(&ifmgd->mtx);
2147
2148 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2149 IEEE80211_STA_CONNECTION_POLL) &&
2150 ifmgd->associated) {
2151 u8 bssid[ETH_ALEN];
2152
2153 memcpy(bssid, ifmgd->associated->cbss.bssid, ETH_ALEN);
2154 if (time_is_after_jiffies(ifmgd->probe_timeout))
2155 run_again(ifmgd, ifmgd->probe_timeout);
2156
2157 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
2158 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2159 printk(KERN_DEBUG "No probe response from AP %pM"
2160 " after %dms, try %d\n", bssid,
2161 (1000 * IEEE80211_PROBE_WAIT)/HZ,
2162 ifmgd->probe_send_count);
2163 #endif
2164 ieee80211_mgd_probe_ap_send(sdata);
2165 } else {
2166 /*
2167 * We actually lost the connection ... or did we?
2168 * Let's make sure!
2169 */
2170 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
2171 IEEE80211_STA_BEACON_POLL);
2172 printk(KERN_DEBUG "No probe response from AP %pM"
2173 " after %dms, disconnecting.\n",
2174 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
2175 ieee80211_set_disassoc(sdata, true);
2176 mutex_unlock(&ifmgd->mtx);
2177 /*
2178 * must be outside lock due to cfg80211,
2179 * but that's not a problem.
2180 */
2181 ieee80211_send_deauth_disassoc(sdata, bssid,
2182 IEEE80211_STYPE_DEAUTH,
2183 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2184 NULL);
2185 mutex_lock(&ifmgd->mtx);
2186 }
2187 }
2188
2189
2190 ieee80211_recalc_idle(local);
2191
2192 list_for_each_entry_safe(wk, tmp, &ifmgd->work_list, list) {
2193 if (time_is_after_jiffies(wk->timeout)) {
2194 /*
2195 * This work item isn't supposed to be worked on
2196 * right now, but take care to adjust the timer
2197 * properly.
2198 */
2199 run_again(ifmgd, wk->timeout);
2200 continue;
2201 }
2202
2203 switch (wk->state) {
2204 default:
2205 WARN_ON(1);
2206 /* fall through */
2207 case IEEE80211_MGD_STATE_IDLE:
2208 /* nothing */
2209 rma = RX_MGMT_NONE;
2210 break;
2211 case IEEE80211_MGD_STATE_PROBE:
2212 rma = ieee80211_direct_probe(sdata, wk);
2213 break;
2214 case IEEE80211_MGD_STATE_AUTH:
2215 rma = ieee80211_authenticate(sdata, wk);
2216 break;
2217 case IEEE80211_MGD_STATE_ASSOC:
2218 rma = ieee80211_associate(sdata, wk);
2219 break;
2220 }
2221
2222 switch (rma) {
2223 case RX_MGMT_NONE:
2224 /* no action required */
2225 break;
2226 case RX_MGMT_CFG80211_AUTH_TO:
2227 case RX_MGMT_CFG80211_ASSOC_TO:
2228 list_del(&wk->list);
2229 list_add(&wk->list, &free_work);
2230 wk->tries = rma; /* small abuse but only local */
2231 break;
2232 default:
2233 WARN(1, "unexpected: %d", rma);
2234 }
2235 }
2236
2237 list_for_each_entry(wk, &ifmgd->work_list, list) {
2238 if (wk->state != IEEE80211_MGD_STATE_IDLE) {
2239 anybusy = true;
2240 break;
2241 }
2242 }
2243 if (!anybusy &&
2244 test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request))
2245 ieee80211_queue_delayed_work(&local->hw,
2246 &local->scan_work,
2247 round_jiffies_relative(0));
2248
2249 mutex_unlock(&ifmgd->mtx);
2250
2251 list_for_each_entry_safe(wk, tmp, &free_work, list) {
2252 switch (wk->tries) {
2253 case RX_MGMT_CFG80211_AUTH_TO:
2254 cfg80211_send_auth_timeout(sdata->dev,
2255 wk->bss->cbss.bssid);
2256 break;
2257 case RX_MGMT_CFG80211_ASSOC_TO:
2258 cfg80211_send_assoc_timeout(sdata->dev,
2259 wk->bss->cbss.bssid);
2260 break;
2261 default:
2262 WARN(1, "unexpected: %d", wk->tries);
2263 }
2264
2265 list_del(&wk->list);
2266 kfree(wk);
2267 }
2268
2269 ieee80211_recalc_idle(local);
2270 }
2271
2272 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2273 {
2274 struct ieee80211_sub_if_data *sdata =
2275 (struct ieee80211_sub_if_data *) data;
2276 struct ieee80211_local *local = sdata->local;
2277
2278 if (local->quiescing)
2279 return;
2280
2281 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
2282 }
2283
2284 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2285 {
2286 struct ieee80211_sub_if_data *sdata =
2287 (struct ieee80211_sub_if_data *) data;
2288 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2289 struct ieee80211_local *local = sdata->local;
2290
2291 if (local->quiescing)
2292 return;
2293
2294 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2295 }
2296
2297 static void ieee80211_sta_monitor_work(struct work_struct *work)
2298 {
2299 struct ieee80211_sub_if_data *sdata =
2300 container_of(work, struct ieee80211_sub_if_data,
2301 u.mgd.monitor_work);
2302
2303 ieee80211_mgd_probe_ap(sdata, false);
2304 }
2305
2306 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2307 {
2308 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2309 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
2310 IEEE80211_STA_CONNECTION_POLL);
2311
2312 /* let's probe the connection once */
2313 ieee80211_queue_work(&sdata->local->hw,
2314 &sdata->u.mgd.monitor_work);
2315 /* and do all the other regular work too */
2316 ieee80211_queue_work(&sdata->local->hw,
2317 &sdata->u.mgd.work);
2318 }
2319 }
2320
2321 #ifdef CONFIG_PM
2322 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2323 {
2324 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2325
2326 /*
2327 * we need to use atomic bitops for the running bits
2328 * only because both timers might fire at the same
2329 * time -- the code here is properly synchronised.
2330 */
2331
2332 cancel_work_sync(&ifmgd->work);
2333 cancel_work_sync(&ifmgd->beacon_loss_work);
2334 if (del_timer_sync(&ifmgd->timer))
2335 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2336
2337 cancel_work_sync(&ifmgd->chswitch_work);
2338 if (del_timer_sync(&ifmgd->chswitch_timer))
2339 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2340
2341 cancel_work_sync(&ifmgd->monitor_work);
2342 /* these will just be re-established on connection */
2343 del_timer_sync(&ifmgd->conn_mon_timer);
2344 del_timer_sync(&ifmgd->bcn_mon_timer);
2345 }
2346
2347 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2348 {
2349 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2350
2351 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2352 add_timer(&ifmgd->timer);
2353 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2354 add_timer(&ifmgd->chswitch_timer);
2355 }
2356 #endif
2357
2358 /* interface setup */
2359 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2360 {
2361 struct ieee80211_if_managed *ifmgd;
2362
2363 ifmgd = &sdata->u.mgd;
2364 INIT_WORK(&ifmgd->work, ieee80211_sta_work);
2365 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2366 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2367 INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
2368 setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2369 (unsigned long) sdata);
2370 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2371 (unsigned long) sdata);
2372 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2373 (unsigned long) sdata);
2374 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2375 (unsigned long) sdata);
2376 skb_queue_head_init(&ifmgd->skb_queue);
2377
2378 INIT_LIST_HEAD(&ifmgd->work_list);
2379
2380 ifmgd->capab = WLAN_CAPABILITY_ESS;
2381 ifmgd->flags = 0;
2382 if (sdata->local->hw.queues >= 4)
2383 ifmgd->flags |= IEEE80211_STA_WMM_ENABLED;
2384
2385 mutex_init(&ifmgd->mtx);
2386
2387 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
2388 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
2389 else
2390 ifmgd->req_smps = IEEE80211_SMPS_OFF;
2391 }
2392
2393 /* scan finished notification */
2394 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2395 {
2396 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2397
2398 /* Restart STA timers */
2399 rcu_read_lock();
2400 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2401 ieee80211_restart_sta_timer(sdata);
2402 rcu_read_unlock();
2403 }
2404
2405 int ieee80211_max_network_latency(struct notifier_block *nb,
2406 unsigned long data, void *dummy)
2407 {
2408 s32 latency_usec = (s32) data;
2409 struct ieee80211_local *local =
2410 container_of(nb, struct ieee80211_local,
2411 network_latency_notifier);
2412
2413 mutex_lock(&local->iflist_mtx);
2414 ieee80211_recalc_ps(local, latency_usec);
2415 mutex_unlock(&local->iflist_mtx);
2416
2417 return 0;
2418 }
2419
2420 /* config hooks */
2421 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2422 struct cfg80211_auth_request *req)
2423 {
2424 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2425 const u8 *ssid;
2426 struct ieee80211_mgd_work *wk;
2427 u16 auth_alg;
2428
2429 switch (req->auth_type) {
2430 case NL80211_AUTHTYPE_OPEN_SYSTEM:
2431 auth_alg = WLAN_AUTH_OPEN;
2432 break;
2433 case NL80211_AUTHTYPE_SHARED_KEY:
2434 auth_alg = WLAN_AUTH_SHARED_KEY;
2435 break;
2436 case NL80211_AUTHTYPE_FT:
2437 auth_alg = WLAN_AUTH_FT;
2438 break;
2439 case NL80211_AUTHTYPE_NETWORK_EAP:
2440 auth_alg = WLAN_AUTH_LEAP;
2441 break;
2442 default:
2443 return -EOPNOTSUPP;
2444 }
2445
2446 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2447 if (!wk)
2448 return -ENOMEM;
2449
2450 wk->bss = (void *)req->bss;
2451
2452 if (req->ie && req->ie_len) {
2453 memcpy(wk->ie, req->ie, req->ie_len);
2454 wk->ie_len = req->ie_len;
2455 }
2456
2457 if (req->key && req->key_len) {
2458 wk->key_len = req->key_len;
2459 wk->key_idx = req->key_idx;
2460 memcpy(wk->key, req->key, req->key_len);
2461 }
2462
2463 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2464 memcpy(wk->ssid, ssid + 2, ssid[1]);
2465 wk->ssid_len = ssid[1];
2466
2467 wk->state = IEEE80211_MGD_STATE_PROBE;
2468 wk->auth_alg = auth_alg;
2469 wk->timeout = jiffies; /* run right away */
2470
2471 /*
2472 * XXX: if still associated need to tell AP that we're going
2473 * to sleep and then change channel etc.
2474 */
2475 sdata->local->oper_channel = req->bss->channel;
2476 ieee80211_hw_config(sdata->local, 0);
2477
2478 mutex_lock(&ifmgd->mtx);
2479 list_add(&wk->list, &sdata->u.mgd.work_list);
2480 mutex_unlock(&ifmgd->mtx);
2481
2482 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.work);
2483 return 0;
2484 }
2485
2486 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2487 struct cfg80211_assoc_request *req)
2488 {
2489 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2490 struct ieee80211_mgd_work *wk, *found = NULL;
2491 int i, err;
2492
2493 mutex_lock(&ifmgd->mtx);
2494
2495 list_for_each_entry(wk, &ifmgd->work_list, list) {
2496 if (&wk->bss->cbss == req->bss &&
2497 wk->state == IEEE80211_MGD_STATE_IDLE) {
2498 found = wk;
2499 break;
2500 }
2501 }
2502
2503 if (!found) {
2504 err = -ENOLINK;
2505 goto out;
2506 }
2507
2508 list_del(&found->list);
2509
2510 wk = krealloc(found, sizeof(*wk) + req->ie_len, GFP_KERNEL);
2511 if (!wk) {
2512 list_add(&found->list, &ifmgd->work_list);
2513 err = -ENOMEM;
2514 goto out;
2515 }
2516
2517 list_add(&wk->list, &ifmgd->work_list);
2518
2519 ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2520
2521 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2522 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2523 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2524 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2525 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2526
2527 sdata->local->oper_channel = req->bss->channel;
2528 ieee80211_hw_config(sdata->local, 0);
2529
2530 if (req->ie && req->ie_len) {
2531 memcpy(wk->ie, req->ie, req->ie_len);
2532 wk->ie_len = req->ie_len;
2533 } else
2534 wk->ie_len = 0;
2535
2536 if (req->prev_bssid)
2537 memcpy(wk->prev_bssid, req->prev_bssid, ETH_ALEN);
2538
2539 wk->state = IEEE80211_MGD_STATE_ASSOC;
2540 wk->tries = 0;
2541 wk->timeout = jiffies; /* run right away */
2542
2543 if (req->use_mfp) {
2544 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2545 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2546 } else {
2547 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2548 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2549 }
2550
2551 if (req->crypto.control_port)
2552 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2553 else
2554 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2555
2556 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.work);
2557
2558 err = 0;
2559
2560 out:
2561 mutex_unlock(&ifmgd->mtx);
2562 return err;
2563 }
2564
2565 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2566 struct cfg80211_deauth_request *req,
2567 void *cookie)
2568 {
2569 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2570 struct ieee80211_mgd_work *wk;
2571 const u8 *bssid = NULL;
2572 bool not_auth_yet = false;
2573
2574 mutex_lock(&ifmgd->mtx);
2575
2576 if (ifmgd->associated && &ifmgd->associated->cbss == req->bss) {
2577 bssid = req->bss->bssid;
2578 ieee80211_set_disassoc(sdata, true);
2579 } else list_for_each_entry(wk, &ifmgd->work_list, list) {
2580 if (&wk->bss->cbss == req->bss) {
2581 bssid = req->bss->bssid;
2582 if (wk->state == IEEE80211_MGD_STATE_PROBE)
2583 not_auth_yet = true;
2584 list_del(&wk->list);
2585 kfree(wk);
2586 break;
2587 }
2588 }
2589
2590 /*
2591 * If somebody requests authentication and we haven't
2592 * sent out an auth frame yet there's no need to send
2593 * out a deauth frame either. If the state was PROBE,
2594 * then this is the case. If it's AUTH we have sent a
2595 * frame, and if it's IDLE we have completed the auth
2596 * process already.
2597 */
2598 if (not_auth_yet) {
2599 mutex_unlock(&ifmgd->mtx);
2600 __cfg80211_auth_canceled(sdata->dev, bssid);
2601 return 0;
2602 }
2603
2604 /*
2605 * cfg80211 should catch this ... but it's racy since
2606 * we can receive a deauth frame, process it, hand it
2607 * to cfg80211 while that's in a locked section already
2608 * trying to tell us that the user wants to disconnect.
2609 */
2610 if (!bssid) {
2611 mutex_unlock(&ifmgd->mtx);
2612 return -ENOLINK;
2613 }
2614
2615 mutex_unlock(&ifmgd->mtx);
2616
2617 printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2618 sdata->name, bssid, req->reason_code);
2619
2620 ieee80211_send_deauth_disassoc(sdata, bssid,
2621 IEEE80211_STYPE_DEAUTH, req->reason_code,
2622 cookie);
2623
2624 return 0;
2625 }
2626
2627 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2628 struct cfg80211_disassoc_request *req,
2629 void *cookie)
2630 {
2631 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2632
2633 mutex_lock(&ifmgd->mtx);
2634
2635 /*
2636 * cfg80211 should catch this ... but it's racy since
2637 * we can receive a disassoc frame, process it, hand it
2638 * to cfg80211 while that's in a locked section already
2639 * trying to tell us that the user wants to disconnect.
2640 */
2641 if (&ifmgd->associated->cbss != req->bss) {
2642 mutex_unlock(&ifmgd->mtx);
2643 return -ENOLINK;
2644 }
2645
2646 printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2647 sdata->name, req->bss->bssid, req->reason_code);
2648
2649 ieee80211_set_disassoc(sdata, false);
2650
2651 mutex_unlock(&ifmgd->mtx);
2652
2653 ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2654 IEEE80211_STYPE_DISASSOC, req->reason_code,
2655 cookie);
2656 return 0;
2657 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree