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tty.h: make tty_port_get() static inline
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / mac80211 / mlme.c
blob05a18f43e1bf73fd34f029b1e35aa0a0193f7162
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(local, 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->dev->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->dev->dev_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 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
402 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
403 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
404 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
405 cap &= ~IEEE80211_HT_CAP_SGI_40;
406 }
407 break;
408 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
409 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
410 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
411 cap &= ~IEEE80211_HT_CAP_SGI_40;
412 }
413 break;
414 }
415
416 tmp = cpu_to_le16(cap);
417 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
418 *pos++ = WLAN_EID_HT_CAPABILITY;
419 *pos++ = sizeof(struct ieee80211_ht_cap);
420 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
421 memcpy(pos, &tmp, sizeof(u16));
422 pos += sizeof(u16);
423 /* TODO: needs a define here for << 2 */
424 *pos++ = sband->ht_cap.ampdu_factor |
425 (sband->ht_cap.ampdu_density << 2);
426 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
427 }
428
429 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
430 ieee80211_tx_skb(sdata, skb);
431 }
432
433
434 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
435 const u8 *bssid, u16 stype, u16 reason,
436 void *cookie)
437 {
438 struct ieee80211_local *local = sdata->local;
439 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
440 struct sk_buff *skb;
441 struct ieee80211_mgmt *mgmt;
442
443 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
444 if (!skb) {
445 printk(KERN_DEBUG "%s: failed to allocate buffer for "
446 "deauth/disassoc frame\n", sdata->dev->name);
447 return;
448 }
449 skb_reserve(skb, local->hw.extra_tx_headroom);
450
451 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
452 memset(mgmt, 0, 24);
453 memcpy(mgmt->da, bssid, ETH_ALEN);
454 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
455 memcpy(mgmt->bssid, bssid, ETH_ALEN);
456 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
457 skb_put(skb, 2);
458 /* u.deauth.reason_code == u.disassoc.reason_code */
459 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
460
461 if (stype == IEEE80211_STYPE_DEAUTH)
462 if (cookie)
463 __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
464 else
465 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
466 else
467 if (cookie)
468 __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
469 else
470 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
471 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
472 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
473 ieee80211_tx_skb(sdata, skb);
474 }
475
476 void ieee80211_send_pspoll(struct ieee80211_local *local,
477 struct ieee80211_sub_if_data *sdata)
478 {
479 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
480 struct ieee80211_pspoll *pspoll;
481 struct sk_buff *skb;
482 u16 fc;
483
484 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
485 if (!skb) {
486 printk(KERN_DEBUG "%s: failed to allocate buffer for "
487 "pspoll frame\n", sdata->dev->name);
488 return;
489 }
490 skb_reserve(skb, local->hw.extra_tx_headroom);
491
492 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
493 memset(pspoll, 0, sizeof(*pspoll));
494 fc = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL | IEEE80211_FCTL_PM;
495 pspoll->frame_control = cpu_to_le16(fc);
496 pspoll->aid = cpu_to_le16(ifmgd->aid);
497
498 /* aid in PS-Poll has its two MSBs each set to 1 */
499 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
500
501 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
502 memcpy(pspoll->ta, sdata->dev->dev_addr, ETH_ALEN);
503
504 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
505 ieee80211_tx_skb(sdata, skb);
506 }
507
508 void ieee80211_send_nullfunc(struct ieee80211_local *local,
509 struct ieee80211_sub_if_data *sdata,
510 int powersave)
511 {
512 struct sk_buff *skb;
513 struct ieee80211_hdr *nullfunc;
514 __le16 fc;
515
516 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
517 return;
518
519 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
520 if (!skb) {
521 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
522 "frame\n", sdata->dev->name);
523 return;
524 }
525 skb_reserve(skb, local->hw.extra_tx_headroom);
526
527 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
528 memset(nullfunc, 0, 24);
529 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
530 IEEE80211_FCTL_TODS);
531 if (powersave)
532 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
533 nullfunc->frame_control = fc;
534 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
535 memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
536 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
537
538 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
539 ieee80211_tx_skb(sdata, skb);
540 }
541
542 /* spectrum management related things */
543 static void ieee80211_chswitch_work(struct work_struct *work)
544 {
545 struct ieee80211_sub_if_data *sdata =
546 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
547 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
548
549 if (!netif_running(sdata->dev))
550 return;
551
552 mutex_lock(&ifmgd->mtx);
553 if (!ifmgd->associated)
554 goto out;
555
556 sdata->local->oper_channel = sdata->local->csa_channel;
557 ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL);
558
559 /* XXX: shouldn't really modify cfg80211-owned data! */
560 ifmgd->associated->cbss.channel = sdata->local->oper_channel;
561
562 ieee80211_wake_queues_by_reason(&sdata->local->hw,
563 IEEE80211_QUEUE_STOP_REASON_CSA);
564 out:
565 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
566 mutex_unlock(&ifmgd->mtx);
567 }
568
569 static void ieee80211_chswitch_timer(unsigned long data)
570 {
571 struct ieee80211_sub_if_data *sdata =
572 (struct ieee80211_sub_if_data *) data;
573 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
574
575 if (sdata->local->quiescing) {
576 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
577 return;
578 }
579
580 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
581 }
582
583 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
584 struct ieee80211_channel_sw_ie *sw_elem,
585 struct ieee80211_bss *bss)
586 {
587 struct ieee80211_channel *new_ch;
588 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
589 int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
590
591 ASSERT_MGD_MTX(ifmgd);
592
593 if (!ifmgd->associated)
594 return;
595
596 if (sdata->local->scanning)
597 return;
598
599 /* Disregard subsequent beacons if we are already running a timer
600 processing a CSA */
601
602 if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
603 return;
604
605 new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
606 if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
607 return;
608
609 sdata->local->csa_channel = new_ch;
610
611 if (sw_elem->count <= 1) {
612 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
613 } else {
614 ieee80211_stop_queues_by_reason(&sdata->local->hw,
615 IEEE80211_QUEUE_STOP_REASON_CSA);
616 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
617 mod_timer(&ifmgd->chswitch_timer,
618 jiffies +
619 msecs_to_jiffies(sw_elem->count *
620 bss->cbss.beacon_interval));
621 }
622 }
623
624 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
625 u16 capab_info, u8 *pwr_constr_elem,
626 u8 pwr_constr_elem_len)
627 {
628 struct ieee80211_conf *conf = &sdata->local->hw.conf;
629
630 if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
631 return;
632
633 /* Power constraint IE length should be 1 octet */
634 if (pwr_constr_elem_len != 1)
635 return;
636
637 if ((*pwr_constr_elem <= conf->channel->max_power) &&
638 (*pwr_constr_elem != sdata->local->power_constr_level)) {
639 sdata->local->power_constr_level = *pwr_constr_elem;
640 ieee80211_hw_config(sdata->local, 0);
641 }
642 }
643
644 /* powersave */
645 static void ieee80211_enable_ps(struct ieee80211_local *local,
646 struct ieee80211_sub_if_data *sdata)
647 {
648 struct ieee80211_conf *conf = &local->hw.conf;
649
650 /*
651 * If we are scanning right now then the parameters will
652 * take effect when scan finishes.
653 */
654 if (local->scanning)
655 return;
656
657 if (conf->dynamic_ps_timeout > 0 &&
658 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
659 mod_timer(&local->dynamic_ps_timer, jiffies +
660 msecs_to_jiffies(conf->dynamic_ps_timeout));
661 } else {
662 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
663 ieee80211_send_nullfunc(local, sdata, 1);
664 conf->flags |= IEEE80211_CONF_PS;
665 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
666 }
667 }
668
669 static void ieee80211_change_ps(struct ieee80211_local *local)
670 {
671 struct ieee80211_conf *conf = &local->hw.conf;
672
673 if (local->ps_sdata) {
674 ieee80211_enable_ps(local, local->ps_sdata);
675 } else if (conf->flags & IEEE80211_CONF_PS) {
676 conf->flags &= ~IEEE80211_CONF_PS;
677 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
678 del_timer_sync(&local->dynamic_ps_timer);
679 cancel_work_sync(&local->dynamic_ps_enable_work);
680 }
681 }
682
683 /* need to hold RTNL or interface lock */
684 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
685 {
686 struct ieee80211_sub_if_data *sdata, *found = NULL;
687 int count = 0;
688
689 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
690 local->ps_sdata = NULL;
691 return;
692 }
693
694 list_for_each_entry(sdata, &local->interfaces, list) {
695 if (!netif_running(sdata->dev))
696 continue;
697 if (sdata->vif.type != NL80211_IFTYPE_STATION)
698 continue;
699 found = sdata;
700 count++;
701 }
702
703 if (count == 1 && found->u.mgd.powersave &&
704 found->u.mgd.associated && list_empty(&found->u.mgd.work_list) &&
705 !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
706 IEEE80211_STA_CONNECTION_POLL))) {
707 s32 beaconint_us;
708
709 if (latency < 0)
710 latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
711
712 beaconint_us = ieee80211_tu_to_usec(
713 found->vif.bss_conf.beacon_int);
714
715 if (beaconint_us > latency) {
716 local->ps_sdata = NULL;
717 } else {
718 u8 dtimper = found->vif.bss_conf.dtim_period;
719 int maxslp = 1;
720
721 if (dtimper > 1)
722 maxslp = min_t(int, dtimper,
723 latency / beaconint_us);
724
725 local->hw.conf.max_sleep_period = maxslp;
726 local->ps_sdata = found;
727 }
728 } else {
729 local->ps_sdata = NULL;
730 }
731
732 ieee80211_change_ps(local);
733 }
734
735 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
736 {
737 struct ieee80211_local *local =
738 container_of(work, struct ieee80211_local,
739 dynamic_ps_disable_work);
740
741 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
742 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
743 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
744 }
745
746 ieee80211_wake_queues_by_reason(&local->hw,
747 IEEE80211_QUEUE_STOP_REASON_PS);
748 }
749
750 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
751 {
752 struct ieee80211_local *local =
753 container_of(work, struct ieee80211_local,
754 dynamic_ps_enable_work);
755 struct ieee80211_sub_if_data *sdata = local->ps_sdata;
756
757 /* can only happen when PS was just disabled anyway */
758 if (!sdata)
759 return;
760
761 if (local->hw.conf.flags & IEEE80211_CONF_PS)
762 return;
763
764 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
765 ieee80211_send_nullfunc(local, sdata, 1);
766
767 local->hw.conf.flags |= IEEE80211_CONF_PS;
768 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
769 }
770
771 void ieee80211_dynamic_ps_timer(unsigned long data)
772 {
773 struct ieee80211_local *local = (void *) data;
774
775 if (local->quiescing || local->suspended)
776 return;
777
778 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
779 }
780
781 /* MLME */
782 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
783 struct ieee80211_if_managed *ifmgd,
784 u8 *wmm_param, size_t wmm_param_len)
785 {
786 struct ieee80211_tx_queue_params params;
787 size_t left;
788 int count;
789 u8 *pos;
790
791 if (!(ifmgd->flags & IEEE80211_STA_WMM_ENABLED))
792 return;
793
794 if (!wmm_param)
795 return;
796
797 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
798 return;
799 count = wmm_param[6] & 0x0f;
800 if (count == ifmgd->wmm_last_param_set)
801 return;
802 ifmgd->wmm_last_param_set = count;
803
804 pos = wmm_param + 8;
805 left = wmm_param_len - 8;
806
807 memset(&params, 0, sizeof(params));
808
809 local->wmm_acm = 0;
810 for (; left >= 4; left -= 4, pos += 4) {
811 int aci = (pos[0] >> 5) & 0x03;
812 int acm = (pos[0] >> 4) & 0x01;
813 int queue;
814
815 switch (aci) {
816 case 1: /* AC_BK */
817 queue = 3;
818 if (acm)
819 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
820 break;
821 case 2: /* AC_VI */
822 queue = 1;
823 if (acm)
824 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
825 break;
826 case 3: /* AC_VO */
827 queue = 0;
828 if (acm)
829 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
830 break;
831 case 0: /* AC_BE */
832 default:
833 queue = 2;
834 if (acm)
835 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
836 break;
837 }
838
839 params.aifs = pos[0] & 0x0f;
840 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
841 params.cw_min = ecw2cw(pos[1] & 0x0f);
842 params.txop = get_unaligned_le16(pos + 2);
843 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
844 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
845 "cWmin=%d cWmax=%d txop=%d\n",
846 wiphy_name(local->hw.wiphy), queue, aci, acm,
847 params.aifs, params.cw_min, params.cw_max, params.txop);
848 #endif
849 if (drv_conf_tx(local, queue, &params) && local->ops->conf_tx)
850 printk(KERN_DEBUG "%s: failed to set TX queue "
851 "parameters for queue %d\n",
852 wiphy_name(local->hw.wiphy), queue);
853 }
854 }
855
856 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
857 u16 capab, bool erp_valid, u8 erp)
858 {
859 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
860 u32 changed = 0;
861 bool use_protection;
862 bool use_short_preamble;
863 bool use_short_slot;
864
865 if (erp_valid) {
866 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
867 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
868 } else {
869 use_protection = false;
870 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
871 }
872
873 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
874
875 if (use_protection != bss_conf->use_cts_prot) {
876 bss_conf->use_cts_prot = use_protection;
877 changed |= BSS_CHANGED_ERP_CTS_PROT;
878 }
879
880 if (use_short_preamble != bss_conf->use_short_preamble) {
881 bss_conf->use_short_preamble = use_short_preamble;
882 changed |= BSS_CHANGED_ERP_PREAMBLE;
883 }
884
885 if (use_short_slot != bss_conf->use_short_slot) {
886 bss_conf->use_short_slot = use_short_slot;
887 changed |= BSS_CHANGED_ERP_SLOT;
888 }
889
890 return changed;
891 }
892
893 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
894 struct ieee80211_mgd_work *wk,
895 u32 bss_info_changed)
896 {
897 struct ieee80211_local *local = sdata->local;
898 struct ieee80211_bss *bss = wk->bss;
899
900 bss_info_changed |= BSS_CHANGED_ASSOC;
901 /* set timing information */
902 sdata->vif.bss_conf.beacon_int = bss->cbss.beacon_interval;
903 sdata->vif.bss_conf.timestamp = bss->cbss.tsf;
904 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
905
906 bss_info_changed |= BSS_CHANGED_BEACON_INT;
907 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
908 bss->cbss.capability, bss->has_erp_value, bss->erp_value);
909
910 sdata->u.mgd.associated = bss;
911 sdata->u.mgd.old_associate_work = wk;
912 memcpy(sdata->u.mgd.bssid, bss->cbss.bssid, ETH_ALEN);
913
914 /* just to be sure */
915 sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
916 IEEE80211_STA_BEACON_POLL);
917
918 /*
919 * Always handle WMM once after association regardless
920 * of the first value the AP uses. Setting -1 here has
921 * that effect because the AP values is an unsigned
922 * 4-bit value.
923 */
924 sdata->u.mgd.wmm_last_param_set = -1;
925
926 ieee80211_led_assoc(local, 1);
927
928 sdata->vif.bss_conf.assoc = 1;
929 /*
930 * For now just always ask the driver to update the basic rateset
931 * when we have associated, we aren't checking whether it actually
932 * changed or not.
933 */
934 bss_info_changed |= BSS_CHANGED_BASIC_RATES;
935
936 /* And the BSSID changed - we're associated now */
937 bss_info_changed |= BSS_CHANGED_BSSID;
938
939 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
940
941 mutex_lock(&local->iflist_mtx);
942 ieee80211_recalc_ps(local, -1);
943 mutex_unlock(&local->iflist_mtx);
944
945 netif_tx_start_all_queues(sdata->dev);
946 netif_carrier_on(sdata->dev);
947 }
948
949 static enum rx_mgmt_action __must_check
950 ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
951 struct ieee80211_mgd_work *wk)
952 {
953 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
954 struct ieee80211_local *local = sdata->local;
955
956 wk->tries++;
957 if (wk->tries > IEEE80211_AUTH_MAX_TRIES) {
958 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
959 sdata->dev->name, wk->bss->cbss.bssid);
960
961 /*
962 * Most likely AP is not in the range so remove the
963 * bss struct for that AP.
964 */
965 cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
966
967 /*
968 * We might have a pending scan which had no chance to run yet
969 * due to work needing to be done. Hence, queue the STAs work
970 * again for that.
971 */
972 ieee80211_queue_work(&local->hw, &ifmgd->work);
973 return RX_MGMT_CFG80211_AUTH_TO;
974 }
975
976 printk(KERN_DEBUG "%s: direct probe to AP %pM (try %d)\n",
977 sdata->dev->name, wk->bss->cbss.bssid,
978 wk->tries);
979
980 /*
981 * Direct probe is sent to broadcast address as some APs
982 * will not answer to direct packet in unassociated state.
983 */
984 ieee80211_send_probe_req(sdata, NULL, wk->ssid, wk->ssid_len, NULL, 0);
985
986 wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
987 run_again(ifmgd, wk->timeout);
988
989 return RX_MGMT_NONE;
990 }
991
992
993 static enum rx_mgmt_action __must_check
994 ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
995 struct ieee80211_mgd_work *wk)
996 {
997 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
998 struct ieee80211_local *local = sdata->local;
999
1000 wk->tries++;
1001 if (wk->tries > IEEE80211_AUTH_MAX_TRIES) {
1002 printk(KERN_DEBUG "%s: authentication with AP %pM"
1003 " timed out\n",
1004 sdata->dev->name, wk->bss->cbss.bssid);
1005
1006 /*
1007 * Most likely AP is not in the range so remove the
1008 * bss struct for that AP.
1009 */
1010 cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
1011
1012 /*
1013 * We might have a pending scan which had no chance to run yet
1014 * due to work needing to be done. Hence, queue the STAs work
1015 * again for that.
1016 */
1017 ieee80211_queue_work(&local->hw, &ifmgd->work);
1018 return RX_MGMT_CFG80211_AUTH_TO;
1019 }
1020
1021 printk(KERN_DEBUG "%s: authenticate with AP %pM (try %d)\n",
1022 sdata->dev->name, wk->bss->cbss.bssid, wk->tries);
1023
1024 ieee80211_send_auth(sdata, 1, wk->auth_alg, wk->ie, wk->ie_len,
1025 wk->bss->cbss.bssid, NULL, 0, 0);
1026 wk->auth_transaction = 2;
1027
1028 wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
1029 run_again(ifmgd, wk->timeout);
1030
1031 return RX_MGMT_NONE;
1032 }
1033
1034 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1035 bool deauth)
1036 {
1037 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1038 struct ieee80211_local *local = sdata->local;
1039 struct sta_info *sta;
1040 u32 changed = 0, config_changed = 0;
1041 u8 bssid[ETH_ALEN];
1042
1043 ASSERT_MGD_MTX(ifmgd);
1044
1045 if (WARN_ON(!ifmgd->associated))
1046 return;
1047
1048 memcpy(bssid, ifmgd->associated->cbss.bssid, ETH_ALEN);
1049
1050 ifmgd->associated = NULL;
1051 memset(ifmgd->bssid, 0, ETH_ALEN);
1052
1053 if (deauth) {
1054 kfree(ifmgd->old_associate_work);
1055 ifmgd->old_associate_work = NULL;
1056 } else {
1057 struct ieee80211_mgd_work *wk = ifmgd->old_associate_work;
1058
1059 wk->state = IEEE80211_MGD_STATE_IDLE;
1060 list_add(&wk->list, &ifmgd->work_list);
1061 }
1062
1063 /*
1064 * we need to commit the associated = NULL change because the
1065 * scan code uses that to determine whether this iface should
1066 * go to/wake up from powersave or not -- and could otherwise
1067 * wake the queues erroneously.
1068 */
1069 smp_mb();
1070
1071 /*
1072 * Thus, we can only afterwards stop the queues -- to account
1073 * for the case where another CPU is finishing a scan at this
1074 * time -- we don't want the scan code to enable queues.
1075 */
1076
1077 netif_tx_stop_all_queues(sdata->dev);
1078 netif_carrier_off(sdata->dev);
1079
1080 rcu_read_lock();
1081 sta = sta_info_get(local, bssid);
1082 if (sta)
1083 ieee80211_sta_tear_down_BA_sessions(sta);
1084 rcu_read_unlock();
1085
1086 changed |= ieee80211_reset_erp_info(sdata);
1087
1088 ieee80211_led_assoc(local, 0);
1089 changed |= BSS_CHANGED_ASSOC;
1090 sdata->vif.bss_conf.assoc = false;
1091
1092 ieee80211_set_wmm_default(sdata);
1093
1094 /* channel(_type) changes are handled by ieee80211_hw_config */
1095 local->oper_channel_type = NL80211_CHAN_NO_HT;
1096
1097 /* on the next assoc, re-program HT parameters */
1098 sdata->ht_opmode_valid = false;
1099
1100 local->power_constr_level = 0;
1101
1102 del_timer_sync(&local->dynamic_ps_timer);
1103 cancel_work_sync(&local->dynamic_ps_enable_work);
1104
1105 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1106 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1107 config_changed |= IEEE80211_CONF_CHANGE_PS;
1108 }
1109
1110 ieee80211_hw_config(local, config_changed);
1111
1112 /* And the BSSID changed -- not very interesting here */
1113 changed |= BSS_CHANGED_BSSID;
1114 ieee80211_bss_info_change_notify(sdata, changed);
1115
1116 rcu_read_lock();
1117
1118 sta = sta_info_get(local, bssid);
1119 if (!sta) {
1120 rcu_read_unlock();
1121 return;
1122 }
1123
1124 sta_info_unlink(&sta);
1125
1126 rcu_read_unlock();
1127
1128 sta_info_destroy(sta);
1129 }
1130
1131 static enum rx_mgmt_action __must_check
1132 ieee80211_associate(struct ieee80211_sub_if_data *sdata,
1133 struct ieee80211_mgd_work *wk)
1134 {
1135 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1136 struct ieee80211_local *local = sdata->local;
1137
1138 wk->tries++;
1139 if (wk->tries > IEEE80211_ASSOC_MAX_TRIES) {
1140 printk(KERN_DEBUG "%s: association with AP %pM"
1141 " timed out\n",
1142 sdata->dev->name, wk->bss->cbss.bssid);
1143
1144 /*
1145 * Most likely AP is not in the range so remove the
1146 * bss struct for that AP.
1147 */
1148 cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
1149
1150 /*
1151 * We might have a pending scan which had no chance to run yet
1152 * due to work needing to be done. Hence, queue the STAs work
1153 * again for that.
1154 */
1155 ieee80211_queue_work(&local->hw, &ifmgd->work);
1156 return RX_MGMT_CFG80211_ASSOC_TO;
1157 }
1158
1159 printk(KERN_DEBUG "%s: associate with AP %pM (try %d)\n",
1160 sdata->dev->name, wk->bss->cbss.bssid, wk->tries);
1161 ieee80211_send_assoc(sdata, wk);
1162
1163 wk->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
1164 run_again(ifmgd, wk->timeout);
1165
1166 return RX_MGMT_NONE;
1167 }
1168
1169 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1170 struct ieee80211_hdr *hdr)
1171 {
1172 /*
1173 * We can postpone the mgd.timer whenever receiving unicast frames
1174 * from AP because we know that the connection is working both ways
1175 * at that time. But multicast frames (and hence also beacons) must
1176 * be ignored here, because we need to trigger the timer during
1177 * data idle periods for sending the periodic probe request to the
1178 * AP we're connected to.
1179 */
1180 if (is_multicast_ether_addr(hdr->addr1))
1181 return;
1182
1183 mod_timer(&sdata->u.mgd.conn_mon_timer,
1184 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
1185 }
1186
1187 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1188 {
1189 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1190 const u8 *ssid;
1191
1192 ssid = ieee80211_bss_get_ie(&ifmgd->associated->cbss, WLAN_EID_SSID);
1193 ieee80211_send_probe_req(sdata, ifmgd->associated->cbss.bssid,
1194 ssid + 2, ssid[1], NULL, 0);
1195
1196 ifmgd->probe_send_count++;
1197 ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
1198 run_again(ifmgd, ifmgd->probe_timeout);
1199 }
1200
1201 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1202 bool beacon)
1203 {
1204 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1205 bool already = false;
1206
1207 if (!netif_running(sdata->dev))
1208 return;
1209
1210 if (sdata->local->scanning)
1211 return;
1212
1213 mutex_lock(&ifmgd->mtx);
1214
1215 if (!ifmgd->associated)
1216 goto out;
1217
1218 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1219 if (beacon && net_ratelimit())
1220 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1221 "- sending probe request\n", sdata->dev->name);
1222 #endif
1223
1224 /*
1225 * The driver/our work has already reported this event or the
1226 * connection monitoring has kicked in and we have already sent
1227 * a probe request. Or maybe the AP died and the driver keeps
1228 * reporting until we disassociate...
1229 *
1230 * In either case we have to ignore the current call to this
1231 * function (except for setting the correct probe reason bit)
1232 * because otherwise we would reset the timer every time and
1233 * never check whether we received a probe response!
1234 */
1235 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1236 IEEE80211_STA_CONNECTION_POLL))
1237 already = true;
1238
1239 if (beacon)
1240 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1241 else
1242 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1243
1244 if (already)
1245 goto out;
1246
1247 mutex_lock(&sdata->local->iflist_mtx);
1248 ieee80211_recalc_ps(sdata->local, -1);
1249 mutex_unlock(&sdata->local->iflist_mtx);
1250
1251 ifmgd->probe_send_count = 0;
1252 ieee80211_mgd_probe_ap_send(sdata);
1253 out:
1254 mutex_unlock(&ifmgd->mtx);
1255 }
1256
1257 void ieee80211_beacon_loss_work(struct work_struct *work)
1258 {
1259 struct ieee80211_sub_if_data *sdata =
1260 container_of(work, struct ieee80211_sub_if_data,
1261 u.mgd.beacon_loss_work);
1262
1263 ieee80211_mgd_probe_ap(sdata, true);
1264 }
1265
1266 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1267 {
1268 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1269
1270 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
1271 }
1272 EXPORT_SYMBOL(ieee80211_beacon_loss);
1273
1274 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1275 struct ieee80211_mgd_work *wk)
1276 {
1277 wk->state = IEEE80211_MGD_STATE_IDLE;
1278 printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1279 }
1280
1281
1282 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1283 struct ieee80211_mgd_work *wk,
1284 struct ieee80211_mgmt *mgmt,
1285 size_t len)
1286 {
1287 u8 *pos;
1288 struct ieee802_11_elems elems;
1289
1290 pos = mgmt->u.auth.variable;
1291 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1292 if (!elems.challenge)
1293 return;
1294 ieee80211_send_auth(sdata, 3, wk->auth_alg,
1295 elems.challenge - 2, elems.challenge_len + 2,
1296 wk->bss->cbss.bssid,
1297 wk->key, wk->key_len, wk->key_idx);
1298 wk->auth_transaction = 4;
1299 }
1300
1301 static enum rx_mgmt_action __must_check
1302 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1303 struct ieee80211_mgd_work *wk,
1304 struct ieee80211_mgmt *mgmt, size_t len)
1305 {
1306 u16 auth_alg, auth_transaction, status_code;
1307
1308 if (wk->state != IEEE80211_MGD_STATE_AUTH)
1309 return RX_MGMT_NONE;
1310
1311 if (len < 24 + 6)
1312 return RX_MGMT_NONE;
1313
1314 if (memcmp(wk->bss->cbss.bssid, mgmt->sa, ETH_ALEN) != 0)
1315 return RX_MGMT_NONE;
1316
1317 if (memcmp(wk->bss->cbss.bssid, mgmt->bssid, ETH_ALEN) != 0)
1318 return RX_MGMT_NONE;
1319
1320 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1321 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1322 status_code = le16_to_cpu(mgmt->u.auth.status_code);
1323
1324 if (auth_alg != wk->auth_alg ||
1325 auth_transaction != wk->auth_transaction)
1326 return RX_MGMT_NONE;
1327
1328 if (status_code != WLAN_STATUS_SUCCESS) {
1329 list_del(&wk->list);
1330 kfree(wk);
1331 return RX_MGMT_CFG80211_AUTH;
1332 }
1333
1334 switch (wk->auth_alg) {
1335 case WLAN_AUTH_OPEN:
1336 case WLAN_AUTH_LEAP:
1337 case WLAN_AUTH_FT:
1338 ieee80211_auth_completed(sdata, wk);
1339 return RX_MGMT_CFG80211_AUTH;
1340 case WLAN_AUTH_SHARED_KEY:
1341 if (wk->auth_transaction == 4) {
1342 ieee80211_auth_completed(sdata, wk);
1343 return RX_MGMT_CFG80211_AUTH;
1344 } else
1345 ieee80211_auth_challenge(sdata, wk, mgmt, len);
1346 break;
1347 }
1348
1349 return RX_MGMT_NONE;
1350 }
1351
1352
1353 static enum rx_mgmt_action __must_check
1354 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1355 struct ieee80211_mgd_work *wk,
1356 struct ieee80211_mgmt *mgmt, size_t len)
1357 {
1358 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1359 const u8 *bssid = NULL;
1360 u16 reason_code;
1361
1362 if (len < 24 + 2)
1363 return RX_MGMT_NONE;
1364
1365 ASSERT_MGD_MTX(ifmgd);
1366
1367 if (wk)
1368 bssid = wk->bss->cbss.bssid;
1369 else
1370 bssid = ifmgd->associated->cbss.bssid;
1371
1372 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1373
1374 printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1375 sdata->dev->name, bssid, reason_code);
1376
1377 if (!wk) {
1378 ieee80211_set_disassoc(sdata, true);
1379 ieee80211_recalc_idle(sdata->local);
1380 } else {
1381 list_del(&wk->list);
1382 kfree(wk);
1383 }
1384
1385 return RX_MGMT_CFG80211_DEAUTH;
1386 }
1387
1388
1389 static enum rx_mgmt_action __must_check
1390 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1391 struct ieee80211_mgmt *mgmt, size_t len)
1392 {
1393 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1394 u16 reason_code;
1395
1396 if (len < 24 + 2)
1397 return RX_MGMT_NONE;
1398
1399 ASSERT_MGD_MTX(ifmgd);
1400
1401 if (WARN_ON(!ifmgd->associated))
1402 return RX_MGMT_NONE;
1403
1404 if (WARN_ON(memcmp(ifmgd->associated->cbss.bssid, mgmt->sa, ETH_ALEN)))
1405 return RX_MGMT_NONE;
1406
1407 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1408
1409 printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1410 sdata->dev->name, mgmt->sa, reason_code);
1411
1412 ieee80211_set_disassoc(sdata, false);
1413 ieee80211_recalc_idle(sdata->local);
1414 return RX_MGMT_CFG80211_DISASSOC;
1415 }
1416
1417
1418 static enum rx_mgmt_action __must_check
1419 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1420 struct ieee80211_mgd_work *wk,
1421 struct ieee80211_mgmt *mgmt, size_t len,
1422 bool reassoc)
1423 {
1424 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1425 struct ieee80211_local *local = sdata->local;
1426 struct ieee80211_supported_band *sband;
1427 struct sta_info *sta;
1428 u32 rates, basic_rates;
1429 u16 capab_info, status_code, aid;
1430 struct ieee802_11_elems elems;
1431 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1432 u8 *pos;
1433 u32 changed = 0;
1434 int i, j;
1435 bool have_higher_than_11mbit = false, newsta = false;
1436 u16 ap_ht_cap_flags;
1437
1438 /*
1439 * AssocResp and ReassocResp have identical structure, so process both
1440 * of them in this function.
1441 */
1442
1443 if (len < 24 + 6)
1444 return RX_MGMT_NONE;
1445
1446 if (memcmp(wk->bss->cbss.bssid, mgmt->sa, ETH_ALEN) != 0)
1447 return RX_MGMT_NONE;
1448
1449 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1450 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1451 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1452
1453 printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1454 "status=%d aid=%d)\n",
1455 sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1456 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1457
1458 pos = mgmt->u.assoc_resp.variable;
1459 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1460
1461 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1462 elems.timeout_int && elems.timeout_int_len == 5 &&
1463 elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1464 u32 tu, ms;
1465 tu = get_unaligned_le32(elems.timeout_int + 1);
1466 ms = tu * 1024 / 1000;
1467 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1468 "comeback duration %u TU (%u ms)\n",
1469 sdata->dev->name, tu, ms);
1470 wk->timeout = jiffies + msecs_to_jiffies(ms);
1471 if (ms > IEEE80211_ASSOC_TIMEOUT)
1472 run_again(ifmgd, jiffies + msecs_to_jiffies(ms));
1473 return RX_MGMT_NONE;
1474 }
1475
1476 if (status_code != WLAN_STATUS_SUCCESS) {
1477 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1478 sdata->dev->name, status_code);
1479 wk->state = IEEE80211_MGD_STATE_IDLE;
1480 return RX_MGMT_CFG80211_ASSOC;
1481 }
1482
1483 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1484 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1485 "set\n", sdata->dev->name, aid);
1486 aid &= ~(BIT(15) | BIT(14));
1487
1488 if (!elems.supp_rates) {
1489 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1490 sdata->dev->name);
1491 return RX_MGMT_NONE;
1492 }
1493
1494 printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1495 ifmgd->aid = aid;
1496
1497 rcu_read_lock();
1498
1499 /* Add STA entry for the AP */
1500 sta = sta_info_get(local, wk->bss->cbss.bssid);
1501 if (!sta) {
1502 newsta = true;
1503
1504 rcu_read_unlock();
1505
1506 sta = sta_info_alloc(sdata, wk->bss->cbss.bssid, GFP_KERNEL);
1507 if (!sta) {
1508 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1509 " the AP\n", sdata->dev->name);
1510 return RX_MGMT_NONE;
1511 }
1512
1513 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1514 WLAN_STA_ASSOC_AP);
1515 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1516 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1517
1518 rcu_read_lock();
1519 }
1520
1521 rates = 0;
1522 basic_rates = 0;
1523 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1524
1525 for (i = 0; i < elems.supp_rates_len; i++) {
1526 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1527 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1528
1529 if (rate > 110)
1530 have_higher_than_11mbit = true;
1531
1532 for (j = 0; j < sband->n_bitrates; j++) {
1533 if (sband->bitrates[j].bitrate == rate) {
1534 rates |= BIT(j);
1535 if (is_basic)
1536 basic_rates |= BIT(j);
1537 break;
1538 }
1539 }
1540 }
1541
1542 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1543 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1544 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1545
1546 if (rate > 110)
1547 have_higher_than_11mbit = true;
1548
1549 for (j = 0; j < sband->n_bitrates; j++) {
1550 if (sband->bitrates[j].bitrate == rate) {
1551 rates |= BIT(j);
1552 if (is_basic)
1553 basic_rates |= BIT(j);
1554 break;
1555 }
1556 }
1557 }
1558
1559 sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1560 sdata->vif.bss_conf.basic_rates = basic_rates;
1561
1562 /* cf. IEEE 802.11 9.2.12 */
1563 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1564 have_higher_than_11mbit)
1565 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1566 else
1567 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1568
1569 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1570 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1571 elems.ht_cap_elem, &sta->sta.ht_cap);
1572
1573 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1574
1575 rate_control_rate_init(sta);
1576
1577 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1578 set_sta_flags(sta, WLAN_STA_MFP);
1579
1580 if (elems.wmm_param)
1581 set_sta_flags(sta, WLAN_STA_WME);
1582
1583 if (newsta) {
1584 int err = sta_info_insert(sta);
1585 if (err) {
1586 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1587 " the AP (error %d)\n", sdata->dev->name, err);
1588 rcu_read_unlock();
1589 return RX_MGMT_NONE;
1590 }
1591 }
1592
1593 rcu_read_unlock();
1594
1595 if (elems.wmm_param)
1596 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1597 elems.wmm_param_len);
1598 else
1599 ieee80211_set_wmm_default(sdata);
1600
1601 if (elems.ht_info_elem && elems.wmm_param &&
1602 (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
1603 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1604 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1605 wk->bss->cbss.bssid,
1606 ap_ht_cap_flags);
1607
1608 /* delete work item -- must be before set_associated for PS */
1609 list_del(&wk->list);
1610
1611 /* set AID and assoc capability,
1612 * ieee80211_set_associated() will tell the driver */
1613 bss_conf->aid = aid;
1614 bss_conf->assoc_capability = capab_info;
1615 /* this will take ownership of wk */
1616 ieee80211_set_associated(sdata, wk, changed);
1617
1618 /*
1619 * Start timer to probe the connection to the AP now.
1620 * Also start the timer that will detect beacon loss.
1621 */
1622 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1623 mod_beacon_timer(sdata);
1624
1625 return RX_MGMT_CFG80211_ASSOC;
1626 }
1627
1628
1629 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1630 struct ieee80211_mgmt *mgmt,
1631 size_t len,
1632 struct ieee80211_rx_status *rx_status,
1633 struct ieee802_11_elems *elems,
1634 bool beacon)
1635 {
1636 struct ieee80211_local *local = sdata->local;
1637 int freq;
1638 struct ieee80211_bss *bss;
1639 struct ieee80211_channel *channel;
1640
1641 if (elems->ds_params && elems->ds_params_len == 1)
1642 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1643 else
1644 freq = rx_status->freq;
1645
1646 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1647
1648 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1649 return;
1650
1651 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1652 channel, beacon);
1653 if (bss)
1654 ieee80211_rx_bss_put(local, bss);
1655
1656 if (!sdata->u.mgd.associated)
1657 return;
1658
1659 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1660 (memcmp(mgmt->bssid, sdata->u.mgd.associated->cbss.bssid,
1661 ETH_ALEN) == 0)) {
1662 struct ieee80211_channel_sw_ie *sw_elem =
1663 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1664 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1665 }
1666 }
1667
1668
1669 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1670 struct ieee80211_mgd_work *wk,
1671 struct ieee80211_mgmt *mgmt, size_t len,
1672 struct ieee80211_rx_status *rx_status)
1673 {
1674 struct ieee80211_if_managed *ifmgd;
1675 size_t baselen;
1676 struct ieee802_11_elems elems;
1677
1678 ifmgd = &sdata->u.mgd;
1679
1680 ASSERT_MGD_MTX(ifmgd);
1681
1682 if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1683 return; /* ignore ProbeResp to foreign address */
1684
1685 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1686 if (baselen > len)
1687 return;
1688
1689 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1690 &elems);
1691
1692 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1693
1694 /* direct probe may be part of the association flow */
1695 if (wk && wk->state == IEEE80211_MGD_STATE_PROBE) {
1696 printk(KERN_DEBUG "%s: direct probe responded\n",
1697 sdata->dev->name);
1698 wk->tries = 0;
1699 wk->state = IEEE80211_MGD_STATE_AUTH;
1700 WARN_ON(ieee80211_authenticate(sdata, wk) != RX_MGMT_NONE);
1701 }
1702
1703 if (ifmgd->associated &&
1704 memcmp(mgmt->bssid, ifmgd->associated->cbss.bssid, ETH_ALEN) == 0 &&
1705 ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1706 IEEE80211_STA_CONNECTION_POLL)) {
1707 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1708 IEEE80211_STA_BEACON_POLL);
1709 mutex_lock(&sdata->local->iflist_mtx);
1710 ieee80211_recalc_ps(sdata->local, -1);
1711 mutex_unlock(&sdata->local->iflist_mtx);
1712 /*
1713 * We've received a probe response, but are not sure whether
1714 * we have or will be receiving any beacons or data, so let's
1715 * schedule the timers again, just in case.
1716 */
1717 mod_beacon_timer(sdata);
1718 mod_timer(&ifmgd->conn_mon_timer,
1719 round_jiffies_up(jiffies +
1720 IEEE80211_CONNECTION_IDLE_TIME));
1721 }
1722 }
1723
1724 /*
1725 * This is the canonical list of information elements we care about,
1726 * the filter code also gives us all changes to the Microsoft OUI
1727 * (00:50:F2) vendor IE which is used for WMM which we need to track.
1728 *
1729 * We implement beacon filtering in software since that means we can
1730 * avoid processing the frame here and in cfg80211, and userspace
1731 * will not be able to tell whether the hardware supports it or not.
1732 *
1733 * XXX: This list needs to be dynamic -- userspace needs to be able to
1734 * add items it requires. It also needs to be able to tell us to
1735 * look out for other vendor IEs.
1736 */
1737 static const u64 care_about_ies =
1738 (1ULL << WLAN_EID_COUNTRY) |
1739 (1ULL << WLAN_EID_ERP_INFO) |
1740 (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1741 (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1742 (1ULL << WLAN_EID_HT_CAPABILITY) |
1743 (1ULL << WLAN_EID_HT_INFORMATION);
1744
1745 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1746 struct ieee80211_mgmt *mgmt,
1747 size_t len,
1748 struct ieee80211_rx_status *rx_status)
1749 {
1750 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1751 size_t baselen;
1752 struct ieee802_11_elems elems;
1753 struct ieee80211_local *local = sdata->local;
1754 u32 changed = 0;
1755 bool erp_valid, directed_tim = false;
1756 u8 erp_value = 0;
1757 u32 ncrc;
1758 u8 *bssid;
1759
1760 ASSERT_MGD_MTX(ifmgd);
1761
1762 /* Process beacon from the current BSS */
1763 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1764 if (baselen > len)
1765 return;
1766
1767 if (rx_status->freq != local->hw.conf.channel->center_freq)
1768 return;
1769
1770 /*
1771 * We might have received a number of frames, among them a
1772 * disassoc frame and a beacon...
1773 */
1774 if (!ifmgd->associated)
1775 return;
1776
1777 bssid = ifmgd->associated->cbss.bssid;
1778
1779 /*
1780 * And in theory even frames from a different AP we were just
1781 * associated to a split-second ago!
1782 */
1783 if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1784 return;
1785
1786 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1787 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1788 if (net_ratelimit()) {
1789 printk(KERN_DEBUG "%s: cancelling probereq poll due "
1790 "to a received beacon\n", sdata->dev->name);
1791 }
1792 #endif
1793 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1794 mutex_lock(&local->iflist_mtx);
1795 ieee80211_recalc_ps(local, -1);
1796 mutex_unlock(&local->iflist_mtx);
1797 }
1798
1799 /*
1800 * Push the beacon loss detection into the future since
1801 * we are processing a beacon from the AP just now.
1802 */
1803 mod_beacon_timer(sdata);
1804
1805 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1806 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1807 len - baselen, &elems,
1808 care_about_ies, ncrc);
1809
1810 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1811 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1812 ifmgd->aid);
1813
1814 if (ncrc != ifmgd->beacon_crc) {
1815 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1816 true);
1817
1818 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1819 elems.wmm_param_len);
1820 }
1821
1822 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1823 if (directed_tim) {
1824 if (local->hw.conf.dynamic_ps_timeout > 0) {
1825 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1826 ieee80211_hw_config(local,
1827 IEEE80211_CONF_CHANGE_PS);
1828 ieee80211_send_nullfunc(local, sdata, 0);
1829 } else {
1830 local->pspolling = true;
1831
1832 /*
1833 * Here is assumed that the driver will be
1834 * able to send ps-poll frame and receive a
1835 * response even though power save mode is
1836 * enabled, but some drivers might require
1837 * to disable power save here. This needs
1838 * to be investigated.
1839 */
1840 ieee80211_send_pspoll(local, sdata);
1841 }
1842 }
1843 }
1844
1845 if (ncrc == ifmgd->beacon_crc)
1846 return;
1847 ifmgd->beacon_crc = ncrc;
1848
1849 if (elems.erp_info && elems.erp_info_len >= 1) {
1850 erp_valid = true;
1851 erp_value = elems.erp_info[0];
1852 } else {
1853 erp_valid = false;
1854 }
1855 changed |= ieee80211_handle_bss_capability(sdata,
1856 le16_to_cpu(mgmt->u.beacon.capab_info),
1857 erp_valid, erp_value);
1858
1859
1860 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1861 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1862 struct sta_info *sta;
1863 struct ieee80211_supported_band *sband;
1864 u16 ap_ht_cap_flags;
1865
1866 rcu_read_lock();
1867
1868 sta = sta_info_get(local, bssid);
1869 if (WARN_ON(!sta)) {
1870 rcu_read_unlock();
1871 return;
1872 }
1873
1874 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1875
1876 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1877 elems.ht_cap_elem, &sta->sta.ht_cap);
1878
1879 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1880
1881 rcu_read_unlock();
1882
1883 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1884 bssid, ap_ht_cap_flags);
1885 }
1886
1887 /* Note: country IE parsing is done for us by cfg80211 */
1888 if (elems.country_elem) {
1889 /* TODO: IBSS also needs this */
1890 if (elems.pwr_constr_elem)
1891 ieee80211_handle_pwr_constr(sdata,
1892 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1893 elems.pwr_constr_elem,
1894 elems.pwr_constr_elem_len);
1895 }
1896
1897 ieee80211_bss_info_change_notify(sdata, changed);
1898 }
1899
1900 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1901 struct sk_buff *skb)
1902 {
1903 struct ieee80211_local *local = sdata->local;
1904 struct ieee80211_mgmt *mgmt;
1905 u16 fc;
1906
1907 if (skb->len < 24)
1908 return RX_DROP_MONITOR;
1909
1910 mgmt = (struct ieee80211_mgmt *) skb->data;
1911 fc = le16_to_cpu(mgmt->frame_control);
1912
1913 switch (fc & IEEE80211_FCTL_STYPE) {
1914 case IEEE80211_STYPE_PROBE_RESP:
1915 case IEEE80211_STYPE_BEACON:
1916 case IEEE80211_STYPE_AUTH:
1917 case IEEE80211_STYPE_ASSOC_RESP:
1918 case IEEE80211_STYPE_REASSOC_RESP:
1919 case IEEE80211_STYPE_DEAUTH:
1920 case IEEE80211_STYPE_DISASSOC:
1921 case IEEE80211_STYPE_ACTION:
1922 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1923 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
1924 return RX_QUEUED;
1925 }
1926
1927 return RX_DROP_MONITOR;
1928 }
1929
1930 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1931 struct sk_buff *skb)
1932 {
1933 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1934 struct ieee80211_rx_status *rx_status;
1935 struct ieee80211_mgmt *mgmt;
1936 struct ieee80211_mgd_work *wk;
1937 enum rx_mgmt_action rma = RX_MGMT_NONE;
1938 u16 fc;
1939
1940 rx_status = (struct ieee80211_rx_status *) skb->cb;
1941 mgmt = (struct ieee80211_mgmt *) skb->data;
1942 fc = le16_to_cpu(mgmt->frame_control);
1943
1944 mutex_lock(&ifmgd->mtx);
1945
1946 if (ifmgd->associated &&
1947 memcmp(ifmgd->associated->cbss.bssid, mgmt->bssid,
1948 ETH_ALEN) == 0) {
1949 switch (fc & IEEE80211_FCTL_STYPE) {
1950 case IEEE80211_STYPE_BEACON:
1951 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1952 rx_status);
1953 break;
1954 case IEEE80211_STYPE_PROBE_RESP:
1955 ieee80211_rx_mgmt_probe_resp(sdata, NULL, mgmt,
1956 skb->len, rx_status);
1957 break;
1958 case IEEE80211_STYPE_DEAUTH:
1959 rma = ieee80211_rx_mgmt_deauth(sdata, NULL,
1960 mgmt, skb->len);
1961 break;
1962 case IEEE80211_STYPE_DISASSOC:
1963 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1964 break;
1965 case IEEE80211_STYPE_ACTION:
1966 if (mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
1967 break;
1968
1969 ieee80211_sta_process_chanswitch(sdata,
1970 &mgmt->u.action.u.chan_switch.sw_elem,
1971 ifmgd->associated);
1972 break;
1973 }
1974 mutex_unlock(&ifmgd->mtx);
1975
1976 switch (rma) {
1977 case RX_MGMT_NONE:
1978 /* no action */
1979 break;
1980 case RX_MGMT_CFG80211_DEAUTH:
1981 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1982 break;
1983 case RX_MGMT_CFG80211_DISASSOC:
1984 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1985 break;
1986 default:
1987 WARN(1, "unexpected: %d", rma);
1988 }
1989 goto out;
1990 }
1991
1992 list_for_each_entry(wk, &ifmgd->work_list, list) {
1993 if (memcmp(wk->bss->cbss.bssid, mgmt->bssid, ETH_ALEN) != 0)
1994 continue;
1995
1996 switch (fc & IEEE80211_FCTL_STYPE) {
1997 case IEEE80211_STYPE_PROBE_RESP:
1998 ieee80211_rx_mgmt_probe_resp(sdata, wk, mgmt, skb->len,
1999 rx_status);
2000 break;
2001 case IEEE80211_STYPE_AUTH:
2002 rma = ieee80211_rx_mgmt_auth(sdata, wk, mgmt, skb->len);
2003 break;
2004 case IEEE80211_STYPE_ASSOC_RESP:
2005 rma = ieee80211_rx_mgmt_assoc_resp(sdata, wk, mgmt,
2006 skb->len, false);
2007 break;
2008 case IEEE80211_STYPE_REASSOC_RESP:
2009 rma = ieee80211_rx_mgmt_assoc_resp(sdata, wk, mgmt,
2010 skb->len, true);
2011 break;
2012 case IEEE80211_STYPE_DEAUTH:
2013 rma = ieee80211_rx_mgmt_deauth(sdata, wk, mgmt,
2014 skb->len);
2015 break;
2016 }
2017 /*
2018 * We've processed this frame for that work, so it can't
2019 * belong to another work struct.
2020 * NB: this is also required for correctness because the
2021 * called functions can free 'wk', and for 'rma'!
2022 */
2023 break;
2024 }
2025
2026 mutex_unlock(&ifmgd->mtx);
2027
2028 switch (rma) {
2029 case RX_MGMT_NONE:
2030 /* no action */
2031 break;
2032 case RX_MGMT_CFG80211_AUTH:
2033 cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, skb->len);
2034 break;
2035 case RX_MGMT_CFG80211_ASSOC:
2036 cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, skb->len);
2037 break;
2038 case RX_MGMT_CFG80211_DEAUTH:
2039 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2040 break;
2041 default:
2042 WARN(1, "unexpected: %d", rma);
2043 }
2044
2045 out:
2046 kfree_skb(skb);
2047 }
2048
2049 static void ieee80211_sta_timer(unsigned long data)
2050 {
2051 struct ieee80211_sub_if_data *sdata =
2052 (struct ieee80211_sub_if_data *) data;
2053 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2054 struct ieee80211_local *local = sdata->local;
2055
2056 if (local->quiescing) {
2057 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2058 return;
2059 }
2060
2061 ieee80211_queue_work(&local->hw, &ifmgd->work);
2062 }
2063
2064 static void ieee80211_sta_work(struct work_struct *work)
2065 {
2066 struct ieee80211_sub_if_data *sdata =
2067 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
2068 struct ieee80211_local *local = sdata->local;
2069 struct ieee80211_if_managed *ifmgd;
2070 struct sk_buff *skb;
2071 struct ieee80211_mgd_work *wk, *tmp;
2072 LIST_HEAD(free_work);
2073 enum rx_mgmt_action rma;
2074 bool anybusy = false;
2075
2076 if (!netif_running(sdata->dev))
2077 return;
2078
2079 if (local->scanning)
2080 return;
2081
2082 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2083 return;
2084
2085 /*
2086 * ieee80211_queue_work() should have picked up most cases,
2087 * here we'll pick the the rest.
2088 */
2089 if (WARN(local->suspended, "STA MLME work scheduled while "
2090 "going to suspend\n"))
2091 return;
2092
2093 ifmgd = &sdata->u.mgd;
2094
2095 /* first process frames to avoid timing out while a frame is pending */
2096 while ((skb = skb_dequeue(&ifmgd->skb_queue)))
2097 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2098
2099 /* then process the rest of the work */
2100 mutex_lock(&ifmgd->mtx);
2101
2102 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2103 IEEE80211_STA_CONNECTION_POLL) &&
2104 ifmgd->associated) {
2105 u8 bssid[ETH_ALEN];
2106
2107 memcpy(bssid, ifmgd->associated->cbss.bssid, ETH_ALEN);
2108 if (time_is_after_jiffies(ifmgd->probe_timeout))
2109 run_again(ifmgd, ifmgd->probe_timeout);
2110
2111 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
2112 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2113 printk(KERN_DEBUG "No probe response from AP %pM"
2114 " after %dms, try %d\n", bssid,
2115 (1000 * IEEE80211_PROBE_WAIT)/HZ,
2116 ifmgd->probe_send_count);
2117 #endif
2118 ieee80211_mgd_probe_ap_send(sdata);
2119 } else {
2120 /*
2121 * We actually lost the connection ... or did we?
2122 * Let's make sure!
2123 */
2124 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
2125 IEEE80211_STA_BEACON_POLL);
2126 printk(KERN_DEBUG "No probe response from AP %pM"
2127 " after %dms, disconnecting.\n",
2128 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
2129 ieee80211_set_disassoc(sdata, true);
2130 ieee80211_recalc_idle(local);
2131 mutex_unlock(&ifmgd->mtx);
2132 /*
2133 * must be outside lock due to cfg80211,
2134 * but that's not a problem.
2135 */
2136 ieee80211_send_deauth_disassoc(sdata, bssid,
2137 IEEE80211_STYPE_DEAUTH,
2138 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2139 NULL);
2140 mutex_lock(&ifmgd->mtx);
2141 }
2142 }
2143
2144
2145 ieee80211_recalc_idle(local);
2146
2147 list_for_each_entry_safe(wk, tmp, &ifmgd->work_list, list) {
2148 if (time_is_after_jiffies(wk->timeout)) {
2149 /*
2150 * This work item isn't supposed to be worked on
2151 * right now, but take care to adjust the timer
2152 * properly.
2153 */
2154 run_again(ifmgd, wk->timeout);
2155 continue;
2156 }
2157
2158 switch (wk->state) {
2159 default:
2160 WARN_ON(1);
2161 /* fall through */
2162 case IEEE80211_MGD_STATE_IDLE:
2163 /* nothing */
2164 rma = RX_MGMT_NONE;
2165 break;
2166 case IEEE80211_MGD_STATE_PROBE:
2167 rma = ieee80211_direct_probe(sdata, wk);
2168 break;
2169 case IEEE80211_MGD_STATE_AUTH:
2170 rma = ieee80211_authenticate(sdata, wk);
2171 break;
2172 case IEEE80211_MGD_STATE_ASSOC:
2173 rma = ieee80211_associate(sdata, wk);
2174 break;
2175 }
2176
2177 switch (rma) {
2178 case RX_MGMT_NONE:
2179 /* no action required */
2180 break;
2181 case RX_MGMT_CFG80211_AUTH_TO:
2182 case RX_MGMT_CFG80211_ASSOC_TO:
2183 list_del(&wk->list);
2184 list_add(&wk->list, &free_work);
2185 wk->tries = rma; /* small abuse but only local */
2186 break;
2187 default:
2188 WARN(1, "unexpected: %d", rma);
2189 }
2190 }
2191
2192 list_for_each_entry(wk, &ifmgd->work_list, list) {
2193 if (wk->state != IEEE80211_MGD_STATE_IDLE) {
2194 anybusy = true;
2195 break;
2196 }
2197 }
2198 if (!anybusy &&
2199 test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request))
2200 ieee80211_queue_delayed_work(&local->hw,
2201 &local->scan_work,
2202 round_jiffies_relative(0));
2203
2204 mutex_unlock(&ifmgd->mtx);
2205
2206 list_for_each_entry_safe(wk, tmp, &free_work, list) {
2207 switch (wk->tries) {
2208 case RX_MGMT_CFG80211_AUTH_TO:
2209 cfg80211_send_auth_timeout(sdata->dev,
2210 wk->bss->cbss.bssid);
2211 break;
2212 case RX_MGMT_CFG80211_ASSOC_TO:
2213 cfg80211_send_assoc_timeout(sdata->dev,
2214 wk->bss->cbss.bssid);
2215 break;
2216 default:
2217 WARN(1, "unexpected: %d", wk->tries);
2218 }
2219
2220 list_del(&wk->list);
2221 kfree(wk);
2222 }
2223
2224 ieee80211_recalc_idle(local);
2225 }
2226
2227 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2228 {
2229 struct ieee80211_sub_if_data *sdata =
2230 (struct ieee80211_sub_if_data *) data;
2231 struct ieee80211_local *local = sdata->local;
2232
2233 if (local->quiescing)
2234 return;
2235
2236 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
2237 }
2238
2239 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2240 {
2241 struct ieee80211_sub_if_data *sdata =
2242 (struct ieee80211_sub_if_data *) data;
2243 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2244 struct ieee80211_local *local = sdata->local;
2245
2246 if (local->quiescing)
2247 return;
2248
2249 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2250 }
2251
2252 static void ieee80211_sta_monitor_work(struct work_struct *work)
2253 {
2254 struct ieee80211_sub_if_data *sdata =
2255 container_of(work, struct ieee80211_sub_if_data,
2256 u.mgd.monitor_work);
2257
2258 ieee80211_mgd_probe_ap(sdata, false);
2259 }
2260
2261 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2262 {
2263 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2264 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
2265 IEEE80211_STA_CONNECTION_POLL);
2266
2267 /* let's probe the connection once */
2268 ieee80211_queue_work(&sdata->local->hw,
2269 &sdata->u.mgd.monitor_work);
2270 /* and do all the other regular work too */
2271 ieee80211_queue_work(&sdata->local->hw,
2272 &sdata->u.mgd.work);
2273 }
2274 }
2275
2276 #ifdef CONFIG_PM
2277 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2278 {
2279 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2280
2281 /*
2282 * we need to use atomic bitops for the running bits
2283 * only because both timers might fire at the same
2284 * time -- the code here is properly synchronised.
2285 */
2286
2287 cancel_work_sync(&ifmgd->work);
2288 cancel_work_sync(&ifmgd->beacon_loss_work);
2289 if (del_timer_sync(&ifmgd->timer))
2290 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2291
2292 cancel_work_sync(&ifmgd->chswitch_work);
2293 if (del_timer_sync(&ifmgd->chswitch_timer))
2294 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2295
2296 cancel_work_sync(&ifmgd->monitor_work);
2297 /* these will just be re-established on connection */
2298 del_timer_sync(&ifmgd->conn_mon_timer);
2299 del_timer_sync(&ifmgd->bcn_mon_timer);
2300 }
2301
2302 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2303 {
2304 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2305
2306 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2307 add_timer(&ifmgd->timer);
2308 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2309 add_timer(&ifmgd->chswitch_timer);
2310 }
2311 #endif
2312
2313 /* interface setup */
2314 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2315 {
2316 struct ieee80211_if_managed *ifmgd;
2317
2318 ifmgd = &sdata->u.mgd;
2319 INIT_WORK(&ifmgd->work, ieee80211_sta_work);
2320 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2321 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2322 INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
2323 setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2324 (unsigned long) sdata);
2325 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2326 (unsigned long) sdata);
2327 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2328 (unsigned long) sdata);
2329 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2330 (unsigned long) sdata);
2331 skb_queue_head_init(&ifmgd->skb_queue);
2332
2333 INIT_LIST_HEAD(&ifmgd->work_list);
2334
2335 ifmgd->capab = WLAN_CAPABILITY_ESS;
2336 ifmgd->flags = 0;
2337 if (sdata->local->hw.queues >= 4)
2338 ifmgd->flags |= IEEE80211_STA_WMM_ENABLED;
2339
2340 mutex_init(&ifmgd->mtx);
2341 }
2342
2343 /* scan finished notification */
2344 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2345 {
2346 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2347
2348 /* Restart STA timers */
2349 rcu_read_lock();
2350 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2351 ieee80211_restart_sta_timer(sdata);
2352 rcu_read_unlock();
2353 }
2354
2355 int ieee80211_max_network_latency(struct notifier_block *nb,
2356 unsigned long data, void *dummy)
2357 {
2358 s32 latency_usec = (s32) data;
2359 struct ieee80211_local *local =
2360 container_of(nb, struct ieee80211_local,
2361 network_latency_notifier);
2362
2363 mutex_lock(&local->iflist_mtx);
2364 ieee80211_recalc_ps(local, latency_usec);
2365 mutex_unlock(&local->iflist_mtx);
2366
2367 return 0;
2368 }
2369
2370 /* config hooks */
2371 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2372 struct cfg80211_auth_request *req)
2373 {
2374 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2375 const u8 *ssid;
2376 struct ieee80211_mgd_work *wk;
2377 u16 auth_alg;
2378
2379 switch (req->auth_type) {
2380 case NL80211_AUTHTYPE_OPEN_SYSTEM:
2381 auth_alg = WLAN_AUTH_OPEN;
2382 break;
2383 case NL80211_AUTHTYPE_SHARED_KEY:
2384 auth_alg = WLAN_AUTH_SHARED_KEY;
2385 break;
2386 case NL80211_AUTHTYPE_FT:
2387 auth_alg = WLAN_AUTH_FT;
2388 break;
2389 case NL80211_AUTHTYPE_NETWORK_EAP:
2390 auth_alg = WLAN_AUTH_LEAP;
2391 break;
2392 default:
2393 return -EOPNOTSUPP;
2394 }
2395
2396 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2397 if (!wk)
2398 return -ENOMEM;
2399
2400 wk->bss = (void *)req->bss;
2401
2402 if (req->ie && req->ie_len) {
2403 memcpy(wk->ie, req->ie, req->ie_len);
2404 wk->ie_len = req->ie_len;
2405 }
2406
2407 if (req->key && req->key_len) {
2408 wk->key_len = req->key_len;
2409 wk->key_idx = req->key_idx;
2410 memcpy(wk->key, req->key, req->key_len);
2411 }
2412
2413 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2414 memcpy(wk->ssid, ssid + 2, ssid[1]);
2415 wk->ssid_len = ssid[1];
2416
2417 wk->state = IEEE80211_MGD_STATE_PROBE;
2418 wk->auth_alg = auth_alg;
2419 wk->timeout = jiffies; /* run right away */
2420
2421 /*
2422 * XXX: if still associated need to tell AP that we're going
2423 * to sleep and then change channel etc.
2424 */
2425 sdata->local->oper_channel = req->bss->channel;
2426 ieee80211_hw_config(sdata->local, 0);
2427
2428 mutex_lock(&ifmgd->mtx);
2429 list_add(&wk->list, &sdata->u.mgd.work_list);
2430 mutex_unlock(&ifmgd->mtx);
2431
2432 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.work);
2433 return 0;
2434 }
2435
2436 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2437 struct cfg80211_assoc_request *req)
2438 {
2439 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2440 struct ieee80211_mgd_work *wk, *found = NULL;
2441 int i, err;
2442
2443 mutex_lock(&ifmgd->mtx);
2444
2445 list_for_each_entry(wk, &ifmgd->work_list, list) {
2446 if (&wk->bss->cbss == req->bss &&
2447 wk->state == IEEE80211_MGD_STATE_IDLE) {
2448 found = wk;
2449 break;
2450 }
2451 }
2452
2453 if (!found) {
2454 err = -ENOLINK;
2455 goto out;
2456 }
2457
2458 list_del(&found->list);
2459
2460 wk = krealloc(found, sizeof(*wk) + req->ie_len, GFP_KERNEL);
2461 if (!wk) {
2462 list_add(&found->list, &ifmgd->work_list);
2463 err = -ENOMEM;
2464 goto out;
2465 }
2466
2467 list_add(&wk->list, &ifmgd->work_list);
2468
2469 ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2470
2471 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2472 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2473 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2474 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2475 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2476
2477 sdata->local->oper_channel = req->bss->channel;
2478 ieee80211_hw_config(sdata->local, 0);
2479
2480 if (req->ie && req->ie_len) {
2481 memcpy(wk->ie, req->ie, req->ie_len);
2482 wk->ie_len = req->ie_len;
2483 } else
2484 wk->ie_len = 0;
2485
2486 if (req->prev_bssid)
2487 memcpy(wk->prev_bssid, req->prev_bssid, ETH_ALEN);
2488
2489 wk->state = IEEE80211_MGD_STATE_ASSOC;
2490 wk->tries = 0;
2491 wk->timeout = jiffies; /* run right away */
2492
2493 if (req->use_mfp) {
2494 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2495 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2496 } else {
2497 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2498 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2499 }
2500
2501 if (req->crypto.control_port)
2502 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2503 else
2504 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2505
2506 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.work);
2507
2508 err = 0;
2509
2510 out:
2511 mutex_unlock(&ifmgd->mtx);
2512 return err;
2513 }
2514
2515 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2516 struct cfg80211_deauth_request *req,
2517 void *cookie)
2518 {
2519 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2520 struct ieee80211_mgd_work *wk;
2521 const u8 *bssid = NULL;
2522 bool not_auth_yet = false;
2523
2524 mutex_lock(&ifmgd->mtx);
2525
2526 if (ifmgd->associated && &ifmgd->associated->cbss == req->bss) {
2527 bssid = req->bss->bssid;
2528 ieee80211_set_disassoc(sdata, true);
2529 } else list_for_each_entry(wk, &ifmgd->work_list, list) {
2530 if (&wk->bss->cbss == req->bss) {
2531 bssid = req->bss->bssid;
2532 if (wk->state == IEEE80211_MGD_STATE_PROBE)
2533 not_auth_yet = true;
2534 list_del(&wk->list);
2535 kfree(wk);
2536 break;
2537 }
2538 }
2539
2540 /*
2541 * If somebody requests authentication and we haven't
2542 * sent out an auth frame yet there's no need to send
2543 * out a deauth frame either. If the state was PROBE,
2544 * then this is the case. If it's AUTH we have sent a
2545 * frame, and if it's IDLE we have completed the auth
2546 * process already.
2547 */
2548 if (not_auth_yet) {
2549 mutex_unlock(&ifmgd->mtx);
2550 __cfg80211_auth_canceled(sdata->dev, bssid);
2551 return 0;
2552 }
2553
2554 /*
2555 * cfg80211 should catch this ... but it's racy since
2556 * we can receive a deauth frame, process it, hand it
2557 * to cfg80211 while that's in a locked section already
2558 * trying to tell us that the user wants to disconnect.
2559 */
2560 if (!bssid) {
2561 mutex_unlock(&ifmgd->mtx);
2562 return -ENOLINK;
2563 }
2564
2565 mutex_unlock(&ifmgd->mtx);
2566
2567 printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2568 sdata->dev->name, bssid, req->reason_code);
2569
2570 ieee80211_send_deauth_disassoc(sdata, bssid,
2571 IEEE80211_STYPE_DEAUTH, req->reason_code,
2572 cookie);
2573
2574 ieee80211_recalc_idle(sdata->local);
2575
2576 return 0;
2577 }
2578
2579 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2580 struct cfg80211_disassoc_request *req,
2581 void *cookie)
2582 {
2583 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2584
2585 mutex_lock(&ifmgd->mtx);
2586
2587 /*
2588 * cfg80211 should catch this ... but it's racy since
2589 * we can receive a disassoc frame, process it, hand it
2590 * to cfg80211 while that's in a locked section already
2591 * trying to tell us that the user wants to disconnect.
2592 */
2593 if (&ifmgd->associated->cbss != req->bss) {
2594 mutex_unlock(&ifmgd->mtx);
2595 return -ENOLINK;
2596 }
2597
2598 printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2599 sdata->dev->name, req->bss->bssid, req->reason_code);
2600
2601 ieee80211_set_disassoc(sdata, false);
2602
2603 mutex_unlock(&ifmgd->mtx);
2604
2605 ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2606 IEEE80211_STYPE_DISASSOC, req->reason_code,
2607 cookie);
2608
2609 ieee80211_recalc_idle(sdata->local);
2610
2611 return 0;
2612 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree