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mac80211: rework MLME for multiple authentications
[mirror_ubuntu-artful-kernel.git] / net / mac80211 / mlme.c
1 /*
2 * BSS client mode implementation
3 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4 * Copyright 2004, Instant802 Networks, Inc.
5 * Copyright 2005, Devicescape Software, Inc.
6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14 #include <linux/delay.h>
15 #include <linux/if_ether.h>
16 #include <linux/skbuff.h>
17 #include <linux/if_arp.h>
18 #include <linux/etherdevice.h>
19 #include <linux/rtnetlink.h>
20 #include <linux/pm_qos_params.h>
21 #include <linux/crc32.h>
22 #include <net/mac80211.h>
23 #include <asm/unaligned.h>
24
25 #include "ieee80211_i.h"
26 #include "driver-ops.h"
27 #include "rate.h"
28 #include "led.h"
29
30 #define IEEE80211_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_MONITORING_INTERVAL (2 * HZ)
35 #define IEEE80211_PROBE_WAIT (HZ / 5)
36
37 #define TMR_RUNNING_TIMER 0
38 #define TMR_RUNNING_CHANSW 1
39
40 /*
41 * All cfg80211 functions have to be called outside a locked
42 * section so that they can acquire a lock themselves... This
43 * is much simpler than queuing up things in cfg80211, but we
44 * do need some indirection for that here.
45 */
46 enum rx_mgmt_action {
47 /* no action required */
48 RX_MGMT_NONE,
49
50 /* caller must call cfg80211_send_rx_auth() */
51 RX_MGMT_CFG80211_AUTH,
52
53 /* caller must call cfg80211_send_rx_assoc() */
54 RX_MGMT_CFG80211_ASSOC,
55
56 /* caller must call cfg80211_send_deauth() */
57 RX_MGMT_CFG80211_DEAUTH,
58
59 /* caller must call cfg80211_send_disassoc() */
60 RX_MGMT_CFG80211_DISASSOC,
61
62 /* caller must call cfg80211_auth_timeout() & free work */
63 RX_MGMT_CFG80211_AUTH_TO,
64
65 /* caller must call cfg80211_assoc_timeout() & free work */
66 RX_MGMT_CFG80211_ASSOC_TO,
67 };
68
69 /* utils */
70 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
71 {
72 WARN_ON(!mutex_is_locked(&ifmgd->mtx));
73 }
74
75 static int ecw2cw(int ecw)
76 {
77 return (1 << ecw) - 1;
78 }
79
80 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
81 struct ieee80211_supported_band *sband,
82 u32 *rates)
83 {
84 int i, j, count;
85 *rates = 0;
86 count = 0;
87 for (i = 0; i < bss->supp_rates_len; i++) {
88 int rate = (bss->supp_rates[i] & 0x7F) * 5;
89
90 for (j = 0; j < sband->n_bitrates; j++)
91 if (sband->bitrates[j].bitrate == rate) {
92 *rates |= BIT(j);
93 count++;
94 break;
95 }
96 }
97
98 return count;
99 }
100
101 /*
102 * ieee80211_enable_ht should be called only after the operating band
103 * has been determined as ht configuration depends on the hw's
104 * HT abilities for a specific band.
105 */
106 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
107 struct ieee80211_ht_info *hti,
108 const u8 *bssid, u16 ap_ht_cap_flags)
109 {
110 struct ieee80211_local *local = sdata->local;
111 struct ieee80211_supported_band *sband;
112 struct sta_info *sta;
113 u32 changed = 0;
114 u16 ht_opmode;
115 bool enable_ht = true, ht_changed;
116 enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
117
118 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
119
120 /* HT is not supported */
121 if (!sband->ht_cap.ht_supported)
122 enable_ht = false;
123
124 /* check that channel matches the right operating channel */
125 if (local->hw.conf.channel->center_freq !=
126 ieee80211_channel_to_frequency(hti->control_chan))
127 enable_ht = false;
128
129 if (enable_ht) {
130 channel_type = NL80211_CHAN_HT20;
131
132 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
133 (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
134 (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
135 switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
136 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
137 if (!(local->hw.conf.channel->flags &
138 IEEE80211_CHAN_NO_HT40PLUS))
139 channel_type = NL80211_CHAN_HT40PLUS;
140 break;
141 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
142 if (!(local->hw.conf.channel->flags &
143 IEEE80211_CHAN_NO_HT40MINUS))
144 channel_type = NL80211_CHAN_HT40MINUS;
145 break;
146 }
147 }
148 }
149
150 ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
151 channel_type != local->hw.conf.channel_type;
152
153 local->oper_channel_type = channel_type;
154
155 if (ht_changed) {
156 /* channel_type change automatically detected */
157 ieee80211_hw_config(local, 0);
158
159 rcu_read_lock();
160 sta = sta_info_get(local, bssid);
161 if (sta)
162 rate_control_rate_update(local, sband, sta,
163 IEEE80211_RC_HT_CHANGED);
164 rcu_read_unlock();
165 }
166
167 /* disable HT */
168 if (!enable_ht)
169 return 0;
170
171 ht_opmode = le16_to_cpu(hti->operation_mode);
172
173 /* if bss configuration changed store the new one */
174 if (!sdata->ht_opmode_valid ||
175 sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
176 changed |= BSS_CHANGED_HT;
177 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
178 sdata->ht_opmode_valid = true;
179 }
180
181 return changed;
182 }
183
184 /* frame sending functions */
185
186 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
187 struct ieee80211_mgd_work *wk)
188 {
189 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
190 struct ieee80211_local *local = sdata->local;
191 struct sk_buff *skb;
192 struct ieee80211_mgmt *mgmt;
193 u8 *pos;
194 const u8 *ies, *ht_ie;
195 int i, len, count, rates_len, supp_rates_len;
196 u16 capab;
197 int wmm = 0;
198 struct ieee80211_supported_band *sband;
199 u32 rates = 0;
200
201 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
202 sizeof(*mgmt) + 200 + wk->ie_len +
203 wk->ssid_len);
204 if (!skb) {
205 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
206 "frame\n", sdata->dev->name);
207 return;
208 }
209 skb_reserve(skb, local->hw.extra_tx_headroom);
210
211 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
212
213 capab = ifmgd->capab;
214
215 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
216 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
217 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
218 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
219 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
220 }
221
222 if (wk->bss->cbss.capability & WLAN_CAPABILITY_PRIVACY)
223 capab |= WLAN_CAPABILITY_PRIVACY;
224 if (wk->bss->wmm_used)
225 wmm = 1;
226
227 /* get all rates supported by the device and the AP as
228 * some APs don't like getting a superset of their rates
229 * in the association request (e.g. D-Link DAP 1353 in
230 * b-only mode) */
231 rates_len = ieee80211_compatible_rates(wk->bss, sband, &rates);
232
233 if ((wk->bss->cbss.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
234 (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
235 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
236
237 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
238 memset(mgmt, 0, 24);
239 memcpy(mgmt->da, wk->bss->cbss.bssid, ETH_ALEN);
240 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
241 memcpy(mgmt->bssid, wk->bss->cbss.bssid, ETH_ALEN);
242
243 if (!is_zero_ether_addr(wk->prev_bssid)) {
244 skb_put(skb, 10);
245 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
246 IEEE80211_STYPE_REASSOC_REQ);
247 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
248 mgmt->u.reassoc_req.listen_interval =
249 cpu_to_le16(local->hw.conf.listen_interval);
250 memcpy(mgmt->u.reassoc_req.current_ap, wk->prev_bssid,
251 ETH_ALEN);
252 } else {
253 skb_put(skb, 4);
254 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
255 IEEE80211_STYPE_ASSOC_REQ);
256 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
257 mgmt->u.assoc_req.listen_interval =
258 cpu_to_le16(local->hw.conf.listen_interval);
259 }
260
261 /* SSID */
262 ies = pos = skb_put(skb, 2 + wk->ssid_len);
263 *pos++ = WLAN_EID_SSID;
264 *pos++ = wk->ssid_len;
265 memcpy(pos, wk->ssid, wk->ssid_len);
266
267 /* add all rates which were marked to be used above */
268 supp_rates_len = rates_len;
269 if (supp_rates_len > 8)
270 supp_rates_len = 8;
271
272 len = sband->n_bitrates;
273 pos = skb_put(skb, supp_rates_len + 2);
274 *pos++ = WLAN_EID_SUPP_RATES;
275 *pos++ = supp_rates_len;
276
277 count = 0;
278 for (i = 0; i < sband->n_bitrates; i++) {
279 if (BIT(i) & rates) {
280 int rate = sband->bitrates[i].bitrate;
281 *pos++ = (u8) (rate / 5);
282 if (++count == 8)
283 break;
284 }
285 }
286
287 if (rates_len > count) {
288 pos = skb_put(skb, rates_len - count + 2);
289 *pos++ = WLAN_EID_EXT_SUPP_RATES;
290 *pos++ = rates_len - count;
291
292 for (i++; i < sband->n_bitrates; i++) {
293 if (BIT(i) & rates) {
294 int rate = sband->bitrates[i].bitrate;
295 *pos++ = (u8) (rate / 5);
296 }
297 }
298 }
299
300 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
301 /* 1. power capabilities */
302 pos = skb_put(skb, 4);
303 *pos++ = WLAN_EID_PWR_CAPABILITY;
304 *pos++ = 2;
305 *pos++ = 0; /* min tx power */
306 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
307
308 /* 2. supported channels */
309 /* TODO: get this in reg domain format */
310 pos = skb_put(skb, 2 * sband->n_channels + 2);
311 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
312 *pos++ = 2 * sband->n_channels;
313 for (i = 0; i < sband->n_channels; i++) {
314 *pos++ = ieee80211_frequency_to_channel(
315 sband->channels[i].center_freq);
316 *pos++ = 1; /* one channel in the subband*/
317 }
318 }
319
320 if (wk->ie_len && wk->ie) {
321 pos = skb_put(skb, wk->ie_len);
322 memcpy(pos, wk->ie, wk->ie_len);
323 }
324
325 if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED)) {
326 pos = skb_put(skb, 9);
327 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
328 *pos++ = 7; /* len */
329 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
330 *pos++ = 0x50;
331 *pos++ = 0xf2;
332 *pos++ = 2; /* WME */
333 *pos++ = 0; /* WME info */
334 *pos++ = 1; /* WME ver */
335 *pos++ = 0;
336 }
337
338 /* wmm support is a must to HT */
339 /*
340 * IEEE802.11n does not allow TKIP/WEP as pairwise
341 * ciphers in HT mode. We still associate in non-ht
342 * mode (11a/b/g) if any one of these ciphers is
343 * configured as pairwise.
344 */
345 if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
346 sband->ht_cap.ht_supported &&
347 (ht_ie = ieee80211_bss_get_ie(&wk->bss->cbss, WLAN_EID_HT_INFORMATION)) &&
348 ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
349 (!(ifmgd->flags & IEEE80211_STA_DISABLE_11N))) {
350 struct ieee80211_ht_info *ht_info =
351 (struct ieee80211_ht_info *)(ht_ie + 2);
352 u16 cap = sband->ht_cap.cap;
353 __le16 tmp;
354 u32 flags = local->hw.conf.channel->flags;
355
356 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
357 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
358 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
359 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
360 cap &= ~IEEE80211_HT_CAP_SGI_40;
361 }
362 break;
363 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
364 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
365 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
366 cap &= ~IEEE80211_HT_CAP_SGI_40;
367 }
368 break;
369 }
370
371 tmp = cpu_to_le16(cap);
372 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
373 *pos++ = WLAN_EID_HT_CAPABILITY;
374 *pos++ = sizeof(struct ieee80211_ht_cap);
375 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
376 memcpy(pos, &tmp, sizeof(u16));
377 pos += sizeof(u16);
378 /* TODO: needs a define here for << 2 */
379 *pos++ = sband->ht_cap.ampdu_factor |
380 (sband->ht_cap.ampdu_density << 2);
381 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
382 }
383
384 ieee80211_tx_skb(sdata, skb, 0);
385 }
386
387
388 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
389 const u8 *bssid, u16 stype, u16 reason)
390 {
391 struct ieee80211_local *local = sdata->local;
392 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
393 struct sk_buff *skb;
394 struct ieee80211_mgmt *mgmt;
395
396 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
397 if (!skb) {
398 printk(KERN_DEBUG "%s: failed to allocate buffer for "
399 "deauth/disassoc frame\n", sdata->dev->name);
400 return;
401 }
402 skb_reserve(skb, local->hw.extra_tx_headroom);
403
404 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
405 memset(mgmt, 0, 24);
406 memcpy(mgmt->da, bssid, ETH_ALEN);
407 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
408 memcpy(mgmt->bssid, bssid, ETH_ALEN);
409 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
410 skb_put(skb, 2);
411 /* u.deauth.reason_code == u.disassoc.reason_code */
412 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
413
414 if (stype == IEEE80211_STYPE_DEAUTH)
415 cfg80211_send_deauth(sdata->dev, (u8 *) mgmt, skb->len,
416 GFP_KERNEL);
417 else
418 cfg80211_send_disassoc(sdata->dev, (u8 *) mgmt, skb->len,
419 GFP_KERNEL);
420 ieee80211_tx_skb(sdata, skb, ifmgd->flags & IEEE80211_STA_MFP_ENABLED);
421 }
422
423 void ieee80211_send_pspoll(struct ieee80211_local *local,
424 struct ieee80211_sub_if_data *sdata)
425 {
426 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
427 struct ieee80211_pspoll *pspoll;
428 struct sk_buff *skb;
429 u16 fc;
430
431 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
432 if (!skb) {
433 printk(KERN_DEBUG "%s: failed to allocate buffer for "
434 "pspoll frame\n", sdata->dev->name);
435 return;
436 }
437 skb_reserve(skb, local->hw.extra_tx_headroom);
438
439 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
440 memset(pspoll, 0, sizeof(*pspoll));
441 fc = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL | IEEE80211_FCTL_PM;
442 pspoll->frame_control = cpu_to_le16(fc);
443 pspoll->aid = cpu_to_le16(ifmgd->aid);
444
445 /* aid in PS-Poll has its two MSBs each set to 1 */
446 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
447
448 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
449 memcpy(pspoll->ta, sdata->dev->dev_addr, ETH_ALEN);
450
451 ieee80211_tx_skb(sdata, skb, 0);
452 }
453
454 void ieee80211_send_nullfunc(struct ieee80211_local *local,
455 struct ieee80211_sub_if_data *sdata,
456 int powersave)
457 {
458 struct sk_buff *skb;
459 struct ieee80211_hdr *nullfunc;
460 __le16 fc;
461
462 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
463 return;
464
465 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
466 if (!skb) {
467 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
468 "frame\n", sdata->dev->name);
469 return;
470 }
471 skb_reserve(skb, local->hw.extra_tx_headroom);
472
473 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
474 memset(nullfunc, 0, 24);
475 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
476 IEEE80211_FCTL_TODS);
477 if (powersave)
478 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
479 nullfunc->frame_control = fc;
480 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
481 memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
482 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
483
484 ieee80211_tx_skb(sdata, skb, 0);
485 }
486
487 /* spectrum management related things */
488 static void ieee80211_chswitch_work(struct work_struct *work)
489 {
490 struct ieee80211_sub_if_data *sdata =
491 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
492 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
493
494 if (!netif_running(sdata->dev))
495 return;
496
497 mutex_lock(&ifmgd->mtx);
498 if (!ifmgd->associated)
499 goto out;
500
501 sdata->local->oper_channel = sdata->local->csa_channel;
502 ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL);
503
504 /* XXX: shouldn't really modify cfg80211-owned data! */
505 ifmgd->associated->cbss.channel = sdata->local->oper_channel;
506
507 ieee80211_wake_queues_by_reason(&sdata->local->hw,
508 IEEE80211_QUEUE_STOP_REASON_CSA);
509 out:
510 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
511 mutex_unlock(&ifmgd->mtx);
512 }
513
514 static void ieee80211_chswitch_timer(unsigned long data)
515 {
516 struct ieee80211_sub_if_data *sdata =
517 (struct ieee80211_sub_if_data *) data;
518 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
519
520 if (sdata->local->quiescing) {
521 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
522 return;
523 }
524
525 queue_work(sdata->local->hw.workqueue, &ifmgd->chswitch_work);
526 }
527
528 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
529 struct ieee80211_channel_sw_ie *sw_elem,
530 struct ieee80211_bss *bss)
531 {
532 struct ieee80211_channel *new_ch;
533 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
534 int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
535
536 ASSERT_MGD_MTX(ifmgd);
537
538 if (!ifmgd->associated)
539 return;
540
541 if (sdata->local->sw_scanning || sdata->local->hw_scanning)
542 return;
543
544 /* Disregard subsequent beacons if we are already running a timer
545 processing a CSA */
546
547 if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
548 return;
549
550 new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
551 if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
552 return;
553
554 sdata->local->csa_channel = new_ch;
555
556 if (sw_elem->count <= 1) {
557 queue_work(sdata->local->hw.workqueue, &ifmgd->chswitch_work);
558 } else {
559 ieee80211_stop_queues_by_reason(&sdata->local->hw,
560 IEEE80211_QUEUE_STOP_REASON_CSA);
561 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
562 mod_timer(&ifmgd->chswitch_timer,
563 jiffies +
564 msecs_to_jiffies(sw_elem->count *
565 bss->cbss.beacon_interval));
566 }
567 }
568
569 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
570 u16 capab_info, u8 *pwr_constr_elem,
571 u8 pwr_constr_elem_len)
572 {
573 struct ieee80211_conf *conf = &sdata->local->hw.conf;
574
575 if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
576 return;
577
578 /* Power constraint IE length should be 1 octet */
579 if (pwr_constr_elem_len != 1)
580 return;
581
582 if ((*pwr_constr_elem <= conf->channel->max_power) &&
583 (*pwr_constr_elem != sdata->local->power_constr_level)) {
584 sdata->local->power_constr_level = *pwr_constr_elem;
585 ieee80211_hw_config(sdata->local, 0);
586 }
587 }
588
589 /* powersave */
590 static void ieee80211_enable_ps(struct ieee80211_local *local,
591 struct ieee80211_sub_if_data *sdata)
592 {
593 struct ieee80211_conf *conf = &local->hw.conf;
594
595 /*
596 * If we are scanning right now then the parameters will
597 * take effect when scan finishes.
598 */
599 if (local->hw_scanning || local->sw_scanning)
600 return;
601
602 if (conf->dynamic_ps_timeout > 0 &&
603 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
604 mod_timer(&local->dynamic_ps_timer, jiffies +
605 msecs_to_jiffies(conf->dynamic_ps_timeout));
606 } else {
607 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
608 ieee80211_send_nullfunc(local, sdata, 1);
609 conf->flags |= IEEE80211_CONF_PS;
610 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
611 }
612 }
613
614 static void ieee80211_change_ps(struct ieee80211_local *local)
615 {
616 struct ieee80211_conf *conf = &local->hw.conf;
617
618 if (local->ps_sdata) {
619 ieee80211_enable_ps(local, local->ps_sdata);
620 } else if (conf->flags & IEEE80211_CONF_PS) {
621 conf->flags &= ~IEEE80211_CONF_PS;
622 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
623 del_timer_sync(&local->dynamic_ps_timer);
624 cancel_work_sync(&local->dynamic_ps_enable_work);
625 }
626 }
627
628 /* need to hold RTNL or interface lock */
629 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
630 {
631 struct ieee80211_sub_if_data *sdata, *found = NULL;
632 int count = 0;
633
634 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
635 local->ps_sdata = NULL;
636 return;
637 }
638
639 list_for_each_entry(sdata, &local->interfaces, list) {
640 if (!netif_running(sdata->dev))
641 continue;
642 if (sdata->vif.type != NL80211_IFTYPE_STATION)
643 continue;
644 found = sdata;
645 count++;
646 }
647
648 if (count == 1 && found->u.mgd.powersave &&
649 found->u.mgd.associated && list_empty(&found->u.mgd.work_list) &&
650 !(found->u.mgd.flags & IEEE80211_STA_PROBEREQ_POLL)) {
651 s32 beaconint_us;
652
653 if (latency < 0)
654 latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
655
656 beaconint_us = ieee80211_tu_to_usec(
657 found->vif.bss_conf.beacon_int);
658
659 if (beaconint_us > latency) {
660 local->ps_sdata = NULL;
661 } else {
662 u8 dtimper = found->vif.bss_conf.dtim_period;
663 int maxslp = 1;
664
665 if (dtimper > 1)
666 maxslp = min_t(int, dtimper,
667 latency / beaconint_us);
668
669 local->hw.conf.max_sleep_period = maxslp;
670 local->ps_sdata = found;
671 }
672 } else {
673 local->ps_sdata = NULL;
674 }
675
676 ieee80211_change_ps(local);
677 }
678
679 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
680 {
681 struct ieee80211_local *local =
682 container_of(work, struct ieee80211_local,
683 dynamic_ps_disable_work);
684
685 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
686 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
687 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
688 }
689
690 ieee80211_wake_queues_by_reason(&local->hw,
691 IEEE80211_QUEUE_STOP_REASON_PS);
692 }
693
694 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
695 {
696 struct ieee80211_local *local =
697 container_of(work, struct ieee80211_local,
698 dynamic_ps_enable_work);
699 struct ieee80211_sub_if_data *sdata = local->ps_sdata;
700
701 /* can only happen when PS was just disabled anyway */
702 if (!sdata)
703 return;
704
705 if (local->hw.conf.flags & IEEE80211_CONF_PS)
706 return;
707
708 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
709 ieee80211_send_nullfunc(local, sdata, 1);
710
711 local->hw.conf.flags |= IEEE80211_CONF_PS;
712 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
713 }
714
715 void ieee80211_dynamic_ps_timer(unsigned long data)
716 {
717 struct ieee80211_local *local = (void *) data;
718
719 if (local->quiescing)
720 return;
721
722 queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
723 }
724
725 /* MLME */
726 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
727 struct ieee80211_if_managed *ifmgd,
728 u8 *wmm_param, size_t wmm_param_len)
729 {
730 struct ieee80211_tx_queue_params params;
731 size_t left;
732 int count;
733 u8 *pos;
734
735 if (!(ifmgd->flags & IEEE80211_STA_WMM_ENABLED))
736 return;
737
738 if (!wmm_param)
739 return;
740
741 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
742 return;
743 count = wmm_param[6] & 0x0f;
744 if (count == ifmgd->wmm_last_param_set)
745 return;
746 ifmgd->wmm_last_param_set = count;
747
748 pos = wmm_param + 8;
749 left = wmm_param_len - 8;
750
751 memset(&params, 0, sizeof(params));
752
753 local->wmm_acm = 0;
754 for (; left >= 4; left -= 4, pos += 4) {
755 int aci = (pos[0] >> 5) & 0x03;
756 int acm = (pos[0] >> 4) & 0x01;
757 int queue;
758
759 switch (aci) {
760 case 1: /* AC_BK */
761 queue = 3;
762 if (acm)
763 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
764 break;
765 case 2: /* AC_VI */
766 queue = 1;
767 if (acm)
768 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
769 break;
770 case 3: /* AC_VO */
771 queue = 0;
772 if (acm)
773 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
774 break;
775 case 0: /* AC_BE */
776 default:
777 queue = 2;
778 if (acm)
779 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
780 break;
781 }
782
783 params.aifs = pos[0] & 0x0f;
784 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
785 params.cw_min = ecw2cw(pos[1] & 0x0f);
786 params.txop = get_unaligned_le16(pos + 2);
787 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
788 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
789 "cWmin=%d cWmax=%d txop=%d\n",
790 wiphy_name(local->hw.wiphy), queue, aci, acm,
791 params.aifs, params.cw_min, params.cw_max, params.txop);
792 #endif
793 if (drv_conf_tx(local, queue, &params) && local->ops->conf_tx)
794 printk(KERN_DEBUG "%s: failed to set TX queue "
795 "parameters for queue %d\n",
796 wiphy_name(local->hw.wiphy), queue);
797 }
798 }
799
800 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
801 u16 capab, bool erp_valid, u8 erp)
802 {
803 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
804 u32 changed = 0;
805 bool use_protection;
806 bool use_short_preamble;
807 bool use_short_slot;
808
809 if (erp_valid) {
810 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
811 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
812 } else {
813 use_protection = false;
814 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
815 }
816
817 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
818
819 if (use_protection != bss_conf->use_cts_prot) {
820 bss_conf->use_cts_prot = use_protection;
821 changed |= BSS_CHANGED_ERP_CTS_PROT;
822 }
823
824 if (use_short_preamble != bss_conf->use_short_preamble) {
825 bss_conf->use_short_preamble = use_short_preamble;
826 changed |= BSS_CHANGED_ERP_PREAMBLE;
827 }
828
829 if (use_short_slot != bss_conf->use_short_slot) {
830 bss_conf->use_short_slot = use_short_slot;
831 changed |= BSS_CHANGED_ERP_SLOT;
832 }
833
834 return changed;
835 }
836
837 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
838 struct ieee80211_bss *bss,
839 u32 bss_info_changed)
840 {
841 struct ieee80211_local *local = sdata->local;
842
843 bss_info_changed |= BSS_CHANGED_ASSOC;
844 /* set timing information */
845 sdata->vif.bss_conf.beacon_int = bss->cbss.beacon_interval;
846 sdata->vif.bss_conf.timestamp = bss->cbss.tsf;
847 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
848
849 bss_info_changed |= BSS_CHANGED_BEACON_INT;
850 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
851 bss->cbss.capability, bss->has_erp_value, bss->erp_value);
852
853 sdata->u.mgd.associated = bss;
854 memcpy(sdata->u.mgd.bssid, bss->cbss.bssid, ETH_ALEN);
855
856 ieee80211_led_assoc(local, 1);
857
858 sdata->vif.bss_conf.assoc = 1;
859 /*
860 * For now just always ask the driver to update the basic rateset
861 * when we have associated, we aren't checking whether it actually
862 * changed or not.
863 */
864 bss_info_changed |= BSS_CHANGED_BASIC_RATES;
865
866 /* And the BSSID changed - we're associated now */
867 bss_info_changed |= BSS_CHANGED_BSSID;
868
869 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
870
871 /* will be same as sdata */
872 if (local->ps_sdata) {
873 mutex_lock(&local->iflist_mtx);
874 ieee80211_recalc_ps(local, -1);
875 mutex_unlock(&local->iflist_mtx);
876 }
877
878 netif_tx_start_all_queues(sdata->dev);
879 netif_carrier_on(sdata->dev);
880 }
881
882 static enum rx_mgmt_action __must_check
883 ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
884 struct ieee80211_mgd_work *wk)
885 {
886 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
887 struct ieee80211_local *local = sdata->local;
888
889 wk->tries++;
890 if (wk->tries > IEEE80211_AUTH_MAX_TRIES) {
891 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
892 sdata->dev->name, wk->bss->cbss.bssid);
893
894 /*
895 * Most likely AP is not in the range so remove the
896 * bss struct for that AP.
897 */
898 cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
899
900 /*
901 * We might have a pending scan which had no chance to run yet
902 * due to work needing to be done. Hence, queue the STAs work
903 * again for that.
904 */
905 queue_work(local->hw.workqueue, &ifmgd->work);
906 return RX_MGMT_CFG80211_AUTH_TO;
907 }
908
909 printk(KERN_DEBUG "%s: direct probe to AP %pM (try %d)\n",
910 sdata->dev->name, wk->bss->cbss.bssid,
911 wk->tries);
912
913 /*
914 * Direct probe is sent to broadcast address as some APs
915 * will not answer to direct packet in unassociated state.
916 */
917 ieee80211_send_probe_req(sdata, NULL, wk->ssid, wk->ssid_len, NULL, 0);
918
919 wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
920 mod_timer(&ifmgd->timer, wk->timeout);
921
922 return RX_MGMT_NONE;
923 }
924
925
926 static enum rx_mgmt_action __must_check
927 ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
928 struct ieee80211_mgd_work *wk)
929 {
930 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
931 struct ieee80211_local *local = sdata->local;
932
933 wk->tries++;
934 if (wk->tries > IEEE80211_AUTH_MAX_TRIES) {
935 printk(KERN_DEBUG "%s: authentication with AP %pM"
936 " timed out\n",
937 sdata->dev->name, wk->bss->cbss.bssid);
938
939 /*
940 * Most likely AP is not in the range so remove the
941 * bss struct for that AP.
942 */
943 cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
944
945 /*
946 * We might have a pending scan which had no chance to run yet
947 * due to work needing to be done. Hence, queue the STAs work
948 * again for that.
949 */
950 queue_work(local->hw.workqueue, &ifmgd->work);
951 return RX_MGMT_CFG80211_AUTH_TO;
952 }
953
954 printk(KERN_DEBUG "%s: authenticate with AP %pM (try %d)\n",
955 sdata->dev->name, wk->bss->cbss.bssid, wk->tries);
956
957 ieee80211_send_auth(sdata, 1, wk->auth_alg, wk->ie, wk->ie_len,
958 wk->bss->cbss.bssid, 0);
959 wk->auth_transaction = 2;
960
961 wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
962 mod_timer(&ifmgd->timer, wk->timeout);
963
964 return RX_MGMT_NONE;
965 }
966
967 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
968 const u8 *bssid, bool deauth)
969 {
970 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
971 struct ieee80211_local *local = sdata->local;
972 struct sta_info *sta;
973 u32 changed = 0, config_changed = 0;
974
975 ASSERT_MGD_MTX(ifmgd);
976
977 ifmgd->associated = NULL;
978 memset(ifmgd->bssid, 0, ETH_ALEN);
979
980 /*
981 * we need to commit the associated = NULL change because the
982 * scan code uses that to determine whether this iface should
983 * go to/wake up from powersave or not -- and could otherwise
984 * wake the queues erroneously.
985 */
986 smp_mb();
987
988 /*
989 * Thus, we can only afterwards stop the queues -- to account
990 * for the case where another CPU is finishing a scan at this
991 * time -- we don't want the scan code to enable queues.
992 */
993
994 netif_tx_stop_all_queues(sdata->dev);
995 netif_carrier_off(sdata->dev);
996
997 rcu_read_lock();
998 sta = sta_info_get(local, bssid);
999 if (sta)
1000 ieee80211_sta_tear_down_BA_sessions(sta);
1001 rcu_read_unlock();
1002
1003 changed |= ieee80211_reset_erp_info(sdata);
1004
1005 ieee80211_led_assoc(local, 0);
1006 changed |= BSS_CHANGED_ASSOC;
1007 sdata->vif.bss_conf.assoc = false;
1008
1009 ieee80211_set_wmm_default(sdata);
1010
1011 ieee80211_recalc_idle(local);
1012
1013 /* channel(_type) changes are handled by ieee80211_hw_config */
1014 local->oper_channel_type = NL80211_CHAN_NO_HT;
1015
1016 /* on the next assoc, re-program HT parameters */
1017 sdata->ht_opmode_valid = false;
1018
1019 local->power_constr_level = 0;
1020
1021 del_timer_sync(&local->dynamic_ps_timer);
1022 cancel_work_sync(&local->dynamic_ps_enable_work);
1023
1024 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1025 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1026 config_changed |= IEEE80211_CONF_CHANGE_PS;
1027 }
1028
1029 ieee80211_hw_config(local, config_changed);
1030
1031 /* And the BSSID changed -- not very interesting here */
1032 changed |= BSS_CHANGED_BSSID;
1033 ieee80211_bss_info_change_notify(sdata, changed);
1034
1035 rcu_read_lock();
1036
1037 sta = sta_info_get(local, bssid);
1038 if (!sta) {
1039 rcu_read_unlock();
1040 return;
1041 }
1042
1043 sta_info_unlink(&sta);
1044
1045 rcu_read_unlock();
1046
1047 sta_info_destroy(sta);
1048 }
1049
1050 static enum rx_mgmt_action __must_check
1051 ieee80211_associate(struct ieee80211_sub_if_data *sdata,
1052 struct ieee80211_mgd_work *wk)
1053 {
1054 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1055 struct ieee80211_local *local = sdata->local;
1056
1057 wk->tries++;
1058 if (wk->tries > IEEE80211_ASSOC_MAX_TRIES) {
1059 printk(KERN_DEBUG "%s: association with AP %pM"
1060 " timed out\n",
1061 sdata->dev->name, wk->bss->cbss.bssid);
1062
1063 /*
1064 * Most likely AP is not in the range so remove the
1065 * bss struct for that AP.
1066 */
1067 cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
1068
1069 /*
1070 * We might have a pending scan which had no chance to run yet
1071 * due to work needing to be done. Hence, queue the STAs work
1072 * again for that.
1073 */
1074 queue_work(local->hw.workqueue, &ifmgd->work);
1075 return RX_MGMT_CFG80211_ASSOC_TO;
1076 }
1077
1078 printk(KERN_DEBUG "%s: associate with AP %pM (try %d)\n",
1079 sdata->dev->name, wk->bss->cbss.bssid, wk->tries);
1080 ieee80211_send_assoc(sdata, wk);
1081
1082 wk->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
1083 mod_timer(&ifmgd->timer, wk->timeout);
1084
1085 return RX_MGMT_NONE;
1086 }
1087
1088 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1089 struct ieee80211_hdr *hdr)
1090 {
1091 /*
1092 * We can postpone the mgd.timer whenever receiving unicast frames
1093 * from AP because we know that the connection is working both ways
1094 * at that time. But multicast frames (and hence also beacons) must
1095 * be ignored here, because we need to trigger the timer during
1096 * data idle periods for sending the periodical probe request to
1097 * the AP.
1098 */
1099 if (!is_multicast_ether_addr(hdr->addr1))
1100 mod_timer(&sdata->u.mgd.timer,
1101 jiffies + IEEE80211_MONITORING_INTERVAL);
1102 }
1103
1104 void ieee80211_beacon_loss_work(struct work_struct *work)
1105 {
1106 struct ieee80211_sub_if_data *sdata =
1107 container_of(work, struct ieee80211_sub_if_data,
1108 u.mgd.beacon_loss_work);
1109 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1110 const u8 *ssid;
1111
1112 /*
1113 * The driver has already reported this event and we have
1114 * already sent a probe request. Maybe the AP died and the
1115 * driver keeps reporting until we disassociate... We have
1116 * to ignore that because otherwise we would continually
1117 * reset the timer and never check whether we received a
1118 * probe response!
1119 */
1120 if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL)
1121 return;
1122
1123 mutex_lock(&ifmgd->mtx);
1124
1125 if (!ifmgd->associated)
1126 goto out;
1127
1128 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1129 if (net_ratelimit())
1130 printk(KERN_DEBUG "%s: driver reports beacon loss from AP "
1131 "- sending probe request\n", sdata->dev->name);
1132 #endif
1133
1134 ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1135
1136 mutex_lock(&sdata->local->iflist_mtx);
1137 ieee80211_recalc_ps(sdata->local, -1);
1138 mutex_unlock(&sdata->local->iflist_mtx);
1139
1140 ssid = ieee80211_bss_get_ie(&ifmgd->associated->cbss, WLAN_EID_SSID);
1141 ieee80211_send_probe_req(sdata, ifmgd->associated->cbss.bssid,
1142 ssid + 2, ssid[1], NULL, 0);
1143
1144 mod_timer(&ifmgd->timer, jiffies + IEEE80211_PROBE_WAIT);
1145 out:
1146 mutex_unlock(&ifmgd->mtx);
1147 }
1148
1149 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1150 {
1151 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1152
1153 queue_work(sdata->local->hw.workqueue,
1154 &sdata->u.mgd.beacon_loss_work);
1155 }
1156 EXPORT_SYMBOL(ieee80211_beacon_loss);
1157
1158 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1159 struct ieee80211_mgd_work *wk)
1160 {
1161 wk->state = IEEE80211_MGD_STATE_IDLE;
1162 printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1163 }
1164
1165
1166 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1167 struct ieee80211_mgd_work *wk,
1168 struct ieee80211_mgmt *mgmt,
1169 size_t len)
1170 {
1171 u8 *pos;
1172 struct ieee802_11_elems elems;
1173
1174 pos = mgmt->u.auth.variable;
1175 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1176 if (!elems.challenge)
1177 return;
1178 ieee80211_send_auth(sdata, 3, wk->auth_alg,
1179 elems.challenge - 2, elems.challenge_len + 2,
1180 wk->bss->cbss.bssid, 1);
1181 wk->auth_transaction = 4;
1182 }
1183
1184 static enum rx_mgmt_action __must_check
1185 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1186 struct ieee80211_mgd_work *wk,
1187 struct ieee80211_mgmt *mgmt, size_t len)
1188 {
1189 u16 auth_alg, auth_transaction, status_code;
1190
1191 if (wk->state != IEEE80211_MGD_STATE_AUTH)
1192 return RX_MGMT_NONE;
1193
1194 if (len < 24 + 6)
1195 return RX_MGMT_NONE;
1196
1197 if (memcmp(wk->bss->cbss.bssid, mgmt->sa, ETH_ALEN) != 0)
1198 return RX_MGMT_NONE;
1199
1200 if (memcmp(wk->bss->cbss.bssid, mgmt->bssid, ETH_ALEN) != 0)
1201 return RX_MGMT_NONE;
1202
1203 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1204 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1205 status_code = le16_to_cpu(mgmt->u.auth.status_code);
1206
1207 if (auth_alg != wk->auth_alg ||
1208 auth_transaction != wk->auth_transaction)
1209 return RX_MGMT_NONE;
1210
1211 if (status_code != WLAN_STATUS_SUCCESS) {
1212 list_del(&wk->list);
1213 kfree(wk);
1214 return RX_MGMT_CFG80211_AUTH;
1215 }
1216
1217 switch (wk->auth_alg) {
1218 case WLAN_AUTH_OPEN:
1219 case WLAN_AUTH_LEAP:
1220 case WLAN_AUTH_FT:
1221 ieee80211_auth_completed(sdata, wk);
1222 return RX_MGMT_CFG80211_AUTH;
1223 case WLAN_AUTH_SHARED_KEY:
1224 if (wk->auth_transaction == 4) {
1225 ieee80211_auth_completed(sdata, wk);
1226 return RX_MGMT_CFG80211_AUTH;
1227 } else
1228 ieee80211_auth_challenge(sdata, wk, mgmt, len);
1229 break;
1230 }
1231
1232 return RX_MGMT_NONE;
1233 }
1234
1235
1236 static enum rx_mgmt_action __must_check
1237 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1238 struct ieee80211_mgd_work *wk,
1239 struct ieee80211_mgmt *mgmt, size_t len)
1240 {
1241 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1242 const u8 *bssid = NULL;
1243 u16 reason_code;
1244
1245 if (len < 24 + 2)
1246 return RX_MGMT_NONE;
1247
1248 ASSERT_MGD_MTX(ifmgd);
1249
1250 if (wk)
1251 bssid = wk->bss->cbss.bssid;
1252 else
1253 bssid = ifmgd->associated->cbss.bssid;
1254
1255 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1256
1257 printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1258 sdata->dev->name, bssid, reason_code);
1259
1260 if (!wk) {
1261 ieee80211_set_disassoc(sdata, bssid, true);
1262 } else {
1263 list_del(&wk->list);
1264 kfree(wk);
1265 }
1266
1267 return RX_MGMT_CFG80211_DEAUTH;
1268 }
1269
1270
1271 static enum rx_mgmt_action __must_check
1272 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1273 struct ieee80211_mgmt *mgmt, size_t len)
1274 {
1275 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1276 u16 reason_code;
1277
1278 if (len < 24 + 2)
1279 return RX_MGMT_NONE;
1280
1281 ASSERT_MGD_MTX(ifmgd);
1282
1283 if (WARN_ON(!ifmgd->associated))
1284 return RX_MGMT_NONE;
1285
1286 if (WARN_ON(memcmp(ifmgd->associated->cbss.bssid, mgmt->sa, ETH_ALEN)))
1287 return RX_MGMT_NONE;
1288
1289 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1290
1291 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1292 sdata->dev->name, reason_code);
1293
1294 ieee80211_set_disassoc(sdata, ifmgd->associated->cbss.bssid, false);
1295 return RX_MGMT_CFG80211_DISASSOC;
1296 }
1297
1298
1299 static enum rx_mgmt_action __must_check
1300 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1301 struct ieee80211_mgd_work *wk,
1302 struct ieee80211_mgmt *mgmt, size_t len,
1303 bool reassoc)
1304 {
1305 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1306 struct ieee80211_local *local = sdata->local;
1307 struct ieee80211_supported_band *sband;
1308 struct sta_info *sta;
1309 u32 rates, basic_rates;
1310 u16 capab_info, status_code, aid;
1311 struct ieee802_11_elems elems;
1312 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1313 u8 *pos;
1314 u32 changed = 0;
1315 int i, j;
1316 bool have_higher_than_11mbit = false, newsta = false;
1317 u16 ap_ht_cap_flags;
1318
1319 /*
1320 * AssocResp and ReassocResp have identical structure, so process both
1321 * of them in this function.
1322 */
1323
1324 if (len < 24 + 6)
1325 return RX_MGMT_NONE;
1326
1327 if (memcmp(wk->bss->cbss.bssid, mgmt->sa, ETH_ALEN) != 0)
1328 return RX_MGMT_NONE;
1329
1330 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1331 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1332 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1333
1334 printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1335 "status=%d aid=%d)\n",
1336 sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1337 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1338
1339 pos = mgmt->u.assoc_resp.variable;
1340 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1341
1342 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1343 elems.timeout_int && elems.timeout_int_len == 5 &&
1344 elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1345 u32 tu, ms;
1346 tu = get_unaligned_le32(elems.timeout_int + 1);
1347 ms = tu * 1024 / 1000;
1348 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1349 "comeback duration %u TU (%u ms)\n",
1350 sdata->dev->name, tu, ms);
1351 wk->timeout = jiffies + msecs_to_jiffies(ms);
1352 if (ms > IEEE80211_ASSOC_TIMEOUT)
1353 mod_timer(&ifmgd->timer,
1354 jiffies + msecs_to_jiffies(ms));
1355 return RX_MGMT_NONE;
1356 }
1357
1358 if (status_code != WLAN_STATUS_SUCCESS) {
1359 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1360 sdata->dev->name, status_code);
1361 list_del(&wk->list);
1362 kfree(wk);
1363 return RX_MGMT_CFG80211_ASSOC;
1364 }
1365
1366 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1367 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1368 "set\n", sdata->dev->name, aid);
1369 aid &= ~(BIT(15) | BIT(14));
1370
1371 if (!elems.supp_rates) {
1372 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1373 sdata->dev->name);
1374 return RX_MGMT_NONE;
1375 }
1376
1377 printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1378 ifmgd->aid = aid;
1379
1380 rcu_read_lock();
1381
1382 /* Add STA entry for the AP */
1383 sta = sta_info_get(local, wk->bss->cbss.bssid);
1384 if (!sta) {
1385 newsta = true;
1386
1387 rcu_read_unlock();
1388
1389 sta = sta_info_alloc(sdata, wk->bss->cbss.bssid, GFP_KERNEL);
1390 if (!sta) {
1391 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1392 " the AP\n", sdata->dev->name);
1393 return RX_MGMT_NONE;
1394 }
1395
1396 /* update new sta with its last rx activity */
1397 sta->last_rx = jiffies;
1398
1399 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1400 WLAN_STA_ASSOC_AP);
1401 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1402 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1403
1404 rcu_read_lock();
1405 }
1406
1407 rates = 0;
1408 basic_rates = 0;
1409 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1410
1411 for (i = 0; i < elems.supp_rates_len; i++) {
1412 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1413 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1414
1415 if (rate > 110)
1416 have_higher_than_11mbit = true;
1417
1418 for (j = 0; j < sband->n_bitrates; j++) {
1419 if (sband->bitrates[j].bitrate == rate) {
1420 rates |= BIT(j);
1421 if (is_basic)
1422 basic_rates |= BIT(j);
1423 break;
1424 }
1425 }
1426 }
1427
1428 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1429 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1430 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1431
1432 if (rate > 110)
1433 have_higher_than_11mbit = true;
1434
1435 for (j = 0; j < sband->n_bitrates; j++) {
1436 if (sband->bitrates[j].bitrate == rate) {
1437 rates |= BIT(j);
1438 if (is_basic)
1439 basic_rates |= BIT(j);
1440 break;
1441 }
1442 }
1443 }
1444
1445 sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1446 sdata->vif.bss_conf.basic_rates = basic_rates;
1447
1448 /* cf. IEEE 802.11 9.2.12 */
1449 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1450 have_higher_than_11mbit)
1451 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1452 else
1453 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1454
1455 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1456 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1457 elems.ht_cap_elem, &sta->sta.ht_cap);
1458
1459 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1460
1461 rate_control_rate_init(sta);
1462
1463 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1464 set_sta_flags(sta, WLAN_STA_MFP);
1465
1466 if (elems.wmm_param)
1467 set_sta_flags(sta, WLAN_STA_WME);
1468
1469 if (newsta) {
1470 int err = sta_info_insert(sta);
1471 if (err) {
1472 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1473 " the AP (error %d)\n", sdata->dev->name, err);
1474 rcu_read_unlock();
1475 return RX_MGMT_NONE;
1476 }
1477 }
1478
1479 rcu_read_unlock();
1480
1481 if (elems.wmm_param)
1482 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1483 elems.wmm_param_len);
1484 else
1485 ieee80211_set_wmm_default(sdata);
1486
1487 if (elems.ht_info_elem && elems.wmm_param &&
1488 (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
1489 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1490 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1491 wk->bss->cbss.bssid,
1492 ap_ht_cap_flags);
1493
1494 /* set AID and assoc capability,
1495 * ieee80211_set_associated() will tell the driver */
1496 bss_conf->aid = aid;
1497 bss_conf->assoc_capability = capab_info;
1498 ieee80211_set_associated(sdata, wk->bss, changed);
1499
1500 /*
1501 * initialise the time of last beacon to be the association time,
1502 * otherwise beacon loss check will trigger immediately
1503 */
1504 ifmgd->last_beacon = jiffies;
1505
1506 list_del(&wk->list);
1507 kfree(wk);
1508 return RX_MGMT_CFG80211_ASSOC;
1509 }
1510
1511
1512 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1513 struct ieee80211_mgmt *mgmt,
1514 size_t len,
1515 struct ieee80211_rx_status *rx_status,
1516 struct ieee802_11_elems *elems,
1517 bool beacon)
1518 {
1519 struct ieee80211_local *local = sdata->local;
1520 int freq;
1521 struct ieee80211_bss *bss;
1522 struct ieee80211_channel *channel;
1523
1524 if (elems->ds_params && elems->ds_params_len == 1)
1525 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1526 else
1527 freq = rx_status->freq;
1528
1529 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1530
1531 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1532 return;
1533
1534 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1535 channel, beacon);
1536 if (bss)
1537 ieee80211_rx_bss_put(local, bss);
1538
1539 if (!sdata->u.mgd.associated)
1540 return;
1541
1542 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1543 (memcmp(mgmt->bssid, sdata->u.mgd.associated->cbss.bssid,
1544 ETH_ALEN) == 0)) {
1545 struct ieee80211_channel_sw_ie *sw_elem =
1546 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1547 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1548 }
1549 }
1550
1551
1552 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1553 struct ieee80211_mgd_work *wk,
1554 struct ieee80211_mgmt *mgmt, size_t len,
1555 struct ieee80211_rx_status *rx_status)
1556 {
1557 struct ieee80211_if_managed *ifmgd;
1558 size_t baselen;
1559 struct ieee802_11_elems elems;
1560
1561 ifmgd = &sdata->u.mgd;
1562
1563 ASSERT_MGD_MTX(ifmgd);
1564
1565 if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1566 return; /* ignore ProbeResp to foreign address */
1567
1568 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1569 if (baselen > len)
1570 return;
1571
1572 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1573 &elems);
1574
1575 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1576
1577 /* direct probe may be part of the association flow */
1578 if (wk && wk->state == IEEE80211_MGD_STATE_PROBE) {
1579 printk(KERN_DEBUG "%s direct probe responded\n",
1580 sdata->dev->name);
1581 wk->tries = 0;
1582 wk->state = IEEE80211_MGD_STATE_AUTH;
1583 WARN_ON(ieee80211_authenticate(sdata, wk) != RX_MGMT_NONE);
1584 }
1585
1586 if (ifmgd->associated &&
1587 memcmp(mgmt->bssid, ifmgd->associated->cbss.bssid, ETH_ALEN) == 0 &&
1588 ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) {
1589 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1590 mutex_lock(&sdata->local->iflist_mtx);
1591 ieee80211_recalc_ps(sdata->local, -1);
1592 mutex_unlock(&sdata->local->iflist_mtx);
1593 }
1594 }
1595
1596 /*
1597 * This is the canonical list of information elements we care about,
1598 * the filter code also gives us all changes to the Microsoft OUI
1599 * (00:50:F2) vendor IE which is used for WMM which we need to track.
1600 *
1601 * We implement beacon filtering in software since that means we can
1602 * avoid processing the frame here and in cfg80211, and userspace
1603 * will not be able to tell whether the hardware supports it or not.
1604 *
1605 * XXX: This list needs to be dynamic -- userspace needs to be able to
1606 * add items it requires. It also needs to be able to tell us to
1607 * look out for other vendor IEs.
1608 */
1609 static const u64 care_about_ies =
1610 (1ULL << WLAN_EID_COUNTRY) |
1611 (1ULL << WLAN_EID_ERP_INFO) |
1612 (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1613 (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1614 (1ULL << WLAN_EID_HT_CAPABILITY) |
1615 (1ULL << WLAN_EID_HT_INFORMATION);
1616
1617 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1618 struct ieee80211_mgmt *mgmt,
1619 size_t len,
1620 struct ieee80211_rx_status *rx_status)
1621 {
1622 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1623 size_t baselen;
1624 struct ieee802_11_elems elems;
1625 struct ieee80211_local *local = sdata->local;
1626 u32 changed = 0;
1627 bool erp_valid, directed_tim = false;
1628 u8 erp_value = 0;
1629 u32 ncrc;
1630 u8 *bssid;
1631
1632 ASSERT_MGD_MTX(ifmgd);
1633
1634 /* Process beacon from the current BSS */
1635 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1636 if (baselen > len)
1637 return;
1638
1639 if (rx_status->freq != local->hw.conf.channel->center_freq)
1640 return;
1641
1642 if (WARN_ON(!ifmgd->associated))
1643 return;
1644
1645 bssid = ifmgd->associated->cbss.bssid;
1646
1647 if (WARN_ON(memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0))
1648 return;
1649
1650 if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) {
1651 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1652 if (net_ratelimit()) {
1653 printk(KERN_DEBUG "%s: cancelling probereq poll due "
1654 "to a received beacon\n", sdata->dev->name);
1655 }
1656 #endif
1657 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1658 mutex_lock(&local->iflist_mtx);
1659 ieee80211_recalc_ps(local, -1);
1660 mutex_unlock(&local->iflist_mtx);
1661 }
1662
1663 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1664 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1665 len - baselen, &elems,
1666 care_about_ies, ncrc);
1667
1668 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1669 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1670 ifmgd->aid);
1671
1672 if (ncrc != ifmgd->beacon_crc) {
1673 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1674 true);
1675
1676 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1677 elems.wmm_param_len);
1678 }
1679
1680 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1681 if (directed_tim) {
1682 if (local->hw.conf.dynamic_ps_timeout > 0) {
1683 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1684 ieee80211_hw_config(local,
1685 IEEE80211_CONF_CHANGE_PS);
1686 ieee80211_send_nullfunc(local, sdata, 0);
1687 } else {
1688 local->pspolling = true;
1689
1690 /*
1691 * Here is assumed that the driver will be
1692 * able to send ps-poll frame and receive a
1693 * response even though power save mode is
1694 * enabled, but some drivers might require
1695 * to disable power save here. This needs
1696 * to be investigated.
1697 */
1698 ieee80211_send_pspoll(local, sdata);
1699 }
1700 }
1701 }
1702
1703 if (ncrc == ifmgd->beacon_crc)
1704 return;
1705 ifmgd->beacon_crc = ncrc;
1706
1707 if (elems.erp_info && elems.erp_info_len >= 1) {
1708 erp_valid = true;
1709 erp_value = elems.erp_info[0];
1710 } else {
1711 erp_valid = false;
1712 }
1713 changed |= ieee80211_handle_bss_capability(sdata,
1714 le16_to_cpu(mgmt->u.beacon.capab_info),
1715 erp_valid, erp_value);
1716
1717
1718 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1719 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1720 struct sta_info *sta;
1721 struct ieee80211_supported_band *sband;
1722 u16 ap_ht_cap_flags;
1723
1724 rcu_read_lock();
1725
1726 sta = sta_info_get(local, bssid);
1727 if (WARN_ON(!sta)) {
1728 rcu_read_unlock();
1729 return;
1730 }
1731
1732 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1733
1734 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1735 elems.ht_cap_elem, &sta->sta.ht_cap);
1736
1737 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1738
1739 rcu_read_unlock();
1740
1741 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1742 bssid, ap_ht_cap_flags);
1743 }
1744
1745 if (elems.country_elem) {
1746 /* Note we are only reviewing this on beacons
1747 * for the BSSID we are associated to */
1748 regulatory_hint_11d(local->hw.wiphy,
1749 elems.country_elem, elems.country_elem_len);
1750
1751 /* TODO: IBSS also needs this */
1752 if (elems.pwr_constr_elem)
1753 ieee80211_handle_pwr_constr(sdata,
1754 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1755 elems.pwr_constr_elem,
1756 elems.pwr_constr_elem_len);
1757 }
1758
1759 ieee80211_bss_info_change_notify(sdata, changed);
1760 }
1761
1762 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1763 struct sk_buff *skb)
1764 {
1765 struct ieee80211_local *local = sdata->local;
1766 struct ieee80211_mgmt *mgmt;
1767 u16 fc;
1768
1769 if (skb->len < 24)
1770 return RX_DROP_MONITOR;
1771
1772 mgmt = (struct ieee80211_mgmt *) skb->data;
1773 fc = le16_to_cpu(mgmt->frame_control);
1774
1775 switch (fc & IEEE80211_FCTL_STYPE) {
1776 case IEEE80211_STYPE_PROBE_REQ:
1777 case IEEE80211_STYPE_PROBE_RESP:
1778 case IEEE80211_STYPE_BEACON:
1779 case IEEE80211_STYPE_AUTH:
1780 case IEEE80211_STYPE_ASSOC_RESP:
1781 case IEEE80211_STYPE_REASSOC_RESP:
1782 case IEEE80211_STYPE_DEAUTH:
1783 case IEEE80211_STYPE_DISASSOC:
1784 case IEEE80211_STYPE_ACTION:
1785 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1786 queue_work(local->hw.workqueue, &sdata->u.mgd.work);
1787 return RX_QUEUED;
1788 }
1789
1790 return RX_DROP_MONITOR;
1791 }
1792
1793 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1794 struct sk_buff *skb)
1795 {
1796 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1797 struct ieee80211_rx_status *rx_status;
1798 struct ieee80211_mgmt *mgmt;
1799 struct ieee80211_mgd_work *wk;
1800 enum rx_mgmt_action rma = RX_MGMT_NONE;
1801 u16 fc;
1802
1803 rx_status = (struct ieee80211_rx_status *) skb->cb;
1804 mgmt = (struct ieee80211_mgmt *) skb->data;
1805 fc = le16_to_cpu(mgmt->frame_control);
1806
1807 mutex_lock(&ifmgd->mtx);
1808
1809 if (ifmgd->associated &&
1810 memcmp(ifmgd->associated->cbss.bssid, mgmt->bssid,
1811 ETH_ALEN) == 0) {
1812 switch (fc & IEEE80211_FCTL_STYPE) {
1813 case IEEE80211_STYPE_BEACON:
1814 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1815 rx_status);
1816 break;
1817 case IEEE80211_STYPE_PROBE_RESP:
1818 ieee80211_rx_mgmt_probe_resp(sdata, NULL, mgmt,
1819 skb->len, rx_status);
1820 break;
1821 case IEEE80211_STYPE_DEAUTH:
1822 rma = ieee80211_rx_mgmt_deauth(sdata, NULL,
1823 mgmt, skb->len);
1824 break;
1825 case IEEE80211_STYPE_DISASSOC:
1826 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1827 break;
1828 case IEEE80211_STYPE_ACTION:
1829 /* XXX: differentiate, can only happen for CSA now! */
1830 ieee80211_sta_process_chanswitch(sdata,
1831 &mgmt->u.action.u.chan_switch.sw_elem,
1832 ifmgd->associated);
1833 break;
1834 }
1835 mutex_unlock(&ifmgd->mtx);
1836
1837 switch (rma) {
1838 case RX_MGMT_NONE:
1839 /* no action */
1840 break;
1841 case RX_MGMT_CFG80211_DEAUTH:
1842 cfg80211_send_deauth(sdata->dev, (u8 *) mgmt,
1843 skb->len, GFP_KERNEL);
1844 break;
1845 case RX_MGMT_CFG80211_DISASSOC:
1846 cfg80211_send_disassoc(sdata->dev, (u8 *) mgmt,
1847 skb->len, GFP_KERNEL);
1848 break;
1849 default:
1850 WARN(1, "unexpected: %d", rma);
1851 }
1852 goto out;
1853 }
1854
1855 list_for_each_entry(wk, &ifmgd->work_list, list) {
1856 if (memcmp(wk->bss->cbss.bssid, mgmt->bssid, ETH_ALEN) != 0)
1857 continue;
1858
1859 switch (fc & IEEE80211_FCTL_STYPE) {
1860 case IEEE80211_STYPE_PROBE_RESP:
1861 ieee80211_rx_mgmt_probe_resp(sdata, wk, mgmt, skb->len,
1862 rx_status);
1863 break;
1864 case IEEE80211_STYPE_AUTH:
1865 rma = ieee80211_rx_mgmt_auth(sdata, wk, mgmt, skb->len);
1866 break;
1867 case IEEE80211_STYPE_ASSOC_RESP:
1868 rma = ieee80211_rx_mgmt_assoc_resp(sdata, wk, mgmt,
1869 skb->len, false);
1870 break;
1871 case IEEE80211_STYPE_REASSOC_RESP:
1872 rma = ieee80211_rx_mgmt_assoc_resp(sdata, wk, mgmt,
1873 skb->len, true);
1874 break;
1875 case IEEE80211_STYPE_DEAUTH:
1876 rma = ieee80211_rx_mgmt_deauth(sdata, wk, mgmt,
1877 skb->len);
1878 break;
1879 }
1880 /*
1881 * We've processed this frame for that work, so it can't
1882 * belong to another work struct.
1883 * NB: this is also required for correctness because the
1884 * called functions can free 'wk', and for 'rma'!
1885 */
1886 break;
1887 }
1888
1889 mutex_unlock(&ifmgd->mtx);
1890
1891 switch (rma) {
1892 case RX_MGMT_NONE:
1893 /* no action */
1894 break;
1895 case RX_MGMT_CFG80211_AUTH:
1896 cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, skb->len,
1897 GFP_KERNEL);
1898 break;
1899 case RX_MGMT_CFG80211_ASSOC:
1900 cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, skb->len,
1901 GFP_KERNEL);
1902 break;
1903 default:
1904 WARN(1, "unexpected: %d", rma);
1905 }
1906
1907 out:
1908 kfree_skb(skb);
1909 }
1910
1911 static void ieee80211_sta_timer(unsigned long data)
1912 {
1913 struct ieee80211_sub_if_data *sdata =
1914 (struct ieee80211_sub_if_data *) data;
1915 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1916 struct ieee80211_local *local = sdata->local;
1917
1918 if (local->quiescing) {
1919 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1920 return;
1921 }
1922
1923 queue_work(local->hw.workqueue, &ifmgd->work);
1924 }
1925
1926 static void ieee80211_sta_work(struct work_struct *work)
1927 {
1928 struct ieee80211_sub_if_data *sdata =
1929 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1930 struct ieee80211_local *local = sdata->local;
1931 struct ieee80211_if_managed *ifmgd;
1932 struct sk_buff *skb;
1933 struct ieee80211_mgd_work *wk, *tmp;
1934 LIST_HEAD(free_work);
1935 enum rx_mgmt_action rma;
1936 bool anybusy = false;
1937
1938 if (!netif_running(sdata->dev))
1939 return;
1940
1941 if (local->sw_scanning || local->hw_scanning)
1942 return;
1943
1944 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1945 return;
1946
1947 /*
1948 * Nothing should have been stuffed into the workqueue during
1949 * the suspend->resume cycle. If this WARN is seen then there
1950 * is a bug with either the driver suspend or something in
1951 * mac80211 stuffing into the workqueue which we haven't yet
1952 * cleared during mac80211's suspend cycle.
1953 */
1954 if (WARN_ON(local->suspended))
1955 return;
1956
1957 ifmgd = &sdata->u.mgd;
1958
1959 /* first process frames to avoid timing out while a frame is pending */
1960 while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1961 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1962
1963 /* then process the rest of the work */
1964 mutex_lock(&ifmgd->mtx);
1965
1966 list_for_each_entry(wk, &ifmgd->work_list, list) {
1967 if (wk->state != IEEE80211_MGD_STATE_IDLE) {
1968 anybusy = true;
1969 break;
1970 }
1971 }
1972
1973 ieee80211_recalc_idle(local);
1974
1975 if (!anybusy) {
1976 mutex_unlock(&ifmgd->mtx);
1977
1978 if (test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request))
1979 queue_delayed_work(local->hw.workqueue,
1980 &local->scan_work,
1981 round_jiffies_relative(0));
1982 return;
1983 }
1984
1985 list_for_each_entry_safe(wk, tmp, &ifmgd->work_list, list) {
1986 if (time_before(jiffies, wk->timeout))
1987 continue;
1988
1989 switch (wk->state) {
1990 default:
1991 WARN_ON(1);
1992 /* fall through */
1993 case IEEE80211_MGD_STATE_IDLE:
1994 /* nothing */
1995 rma = RX_MGMT_NONE;
1996 break;
1997 case IEEE80211_MGD_STATE_PROBE:
1998 rma = ieee80211_direct_probe(sdata, wk);
1999 break;
2000 case IEEE80211_MGD_STATE_AUTH:
2001 rma = ieee80211_authenticate(sdata, wk);
2002 break;
2003 case IEEE80211_MGD_STATE_ASSOC:
2004 rma = ieee80211_associate(sdata, wk);
2005 break;
2006 }
2007
2008 switch (rma) {
2009 case RX_MGMT_NONE:
2010 /* no action required */
2011 break;
2012 case RX_MGMT_CFG80211_AUTH_TO:
2013 case RX_MGMT_CFG80211_ASSOC_TO:
2014 list_del(&wk->list);
2015 list_add(&wk->list, &free_work);
2016 wk->tries = rma; /* small abuse but only local */
2017 break;
2018 default:
2019 WARN(1, "unexpected: %d", rma);
2020 }
2021 }
2022
2023 mutex_unlock(&ifmgd->mtx);
2024
2025 list_for_each_entry_safe(wk, tmp, &free_work, list) {
2026 switch (wk->tries) {
2027 case RX_MGMT_CFG80211_AUTH_TO:
2028 cfg80211_send_auth_timeout(sdata->dev,
2029 wk->bss->cbss.bssid,
2030 GFP_KERNEL);
2031 break;
2032 case RX_MGMT_CFG80211_ASSOC_TO:
2033 cfg80211_send_auth_timeout(sdata->dev,
2034 wk->bss->cbss.bssid,
2035 GFP_KERNEL);
2036 break;
2037 default:
2038 WARN(1, "unexpected: %d", wk->tries);
2039 }
2040
2041 list_del(&wk->list);
2042 kfree(wk);
2043 }
2044
2045 ieee80211_recalc_idle(local);
2046 }
2047
2048 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2049 {
2050 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2051 /*
2052 * Need to update last_beacon to avoid beacon loss
2053 * test to trigger.
2054 */
2055 sdata->u.mgd.last_beacon = jiffies;
2056
2057 queue_work(sdata->local->hw.workqueue,
2058 &sdata->u.mgd.work);
2059 }
2060 }
2061
2062 #ifdef CONFIG_PM
2063 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2064 {
2065 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2066
2067 /*
2068 * we need to use atomic bitops for the running bits
2069 * only because both timers might fire at the same
2070 * time -- the code here is properly synchronised.
2071 */
2072
2073 cancel_work_sync(&ifmgd->work);
2074 cancel_work_sync(&ifmgd->beacon_loss_work);
2075 if (del_timer_sync(&ifmgd->timer))
2076 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2077
2078 cancel_work_sync(&ifmgd->chswitch_work);
2079 if (del_timer_sync(&ifmgd->chswitch_timer))
2080 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2081 }
2082
2083 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2084 {
2085 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2086
2087 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2088 add_timer(&ifmgd->timer);
2089 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2090 add_timer(&ifmgd->chswitch_timer);
2091 }
2092 #endif
2093
2094 /* interface setup */
2095 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2096 {
2097 struct ieee80211_if_managed *ifmgd;
2098
2099 ifmgd = &sdata->u.mgd;
2100 INIT_WORK(&ifmgd->work, ieee80211_sta_work);
2101 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2102 INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
2103 setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2104 (unsigned long) sdata);
2105 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2106 (unsigned long) sdata);
2107 skb_queue_head_init(&ifmgd->skb_queue);
2108
2109 INIT_LIST_HEAD(&ifmgd->work_list);
2110
2111 ifmgd->capab = WLAN_CAPABILITY_ESS;
2112 ifmgd->flags = 0;
2113 if (sdata->local->hw.queues >= 4)
2114 ifmgd->flags |= IEEE80211_STA_WMM_ENABLED;
2115
2116 mutex_init(&ifmgd->mtx);
2117 }
2118
2119 /* scan finished notification */
2120 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2121 {
2122 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2123
2124 /* Restart STA timers */
2125 rcu_read_lock();
2126 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2127 ieee80211_restart_sta_timer(sdata);
2128 rcu_read_unlock();
2129 }
2130
2131 int ieee80211_max_network_latency(struct notifier_block *nb,
2132 unsigned long data, void *dummy)
2133 {
2134 s32 latency_usec = (s32) data;
2135 struct ieee80211_local *local =
2136 container_of(nb, struct ieee80211_local,
2137 network_latency_notifier);
2138
2139 mutex_lock(&local->iflist_mtx);
2140 ieee80211_recalc_ps(local, latency_usec);
2141 mutex_unlock(&local->iflist_mtx);
2142
2143 return 0;
2144 }
2145
2146 /* config hooks */
2147 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2148 struct cfg80211_auth_request *req)
2149 {
2150 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2151 const u8 *ssid;
2152 struct ieee80211_mgd_work *wk;
2153 u16 auth_alg;
2154
2155 switch (req->auth_type) {
2156 case NL80211_AUTHTYPE_OPEN_SYSTEM:
2157 auth_alg = WLAN_AUTH_OPEN;
2158 break;
2159 case NL80211_AUTHTYPE_SHARED_KEY:
2160 auth_alg = WLAN_AUTH_SHARED_KEY;
2161 break;
2162 case NL80211_AUTHTYPE_FT:
2163 auth_alg = WLAN_AUTH_FT;
2164 break;
2165 case NL80211_AUTHTYPE_NETWORK_EAP:
2166 auth_alg = WLAN_AUTH_LEAP;
2167 break;
2168 default:
2169 return -EOPNOTSUPP;
2170 }
2171
2172 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2173 if (!wk)
2174 return -ENOMEM;
2175
2176 wk->bss = (void *)req->bss;
2177
2178 if (req->ie && req->ie_len) {
2179 memcpy(wk->ie, req->ie, req->ie_len);
2180 wk->ie_len = req->ie_len;
2181 }
2182
2183 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2184 memcpy(wk->ssid, ssid + 2, ssid[1]);
2185 wk->ssid_len = ssid[1];
2186
2187 wk->state = IEEE80211_MGD_STATE_PROBE;
2188 wk->auth_alg = auth_alg;
2189
2190 /*
2191 * XXX: if still associated need to tell AP that we're going
2192 * to sleep and then change channel etc.
2193 */
2194 sdata->local->oper_channel = req->bss->channel;
2195 ieee80211_hw_config(sdata->local, 0);
2196
2197 mutex_lock(&ifmgd->mtx);
2198 list_add(&wk->list, &sdata->u.mgd.work_list);
2199 mutex_unlock(&ifmgd->mtx);
2200
2201 queue_work(sdata->local->hw.workqueue, &sdata->u.mgd.work);
2202 return 0;
2203 }
2204
2205 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2206 struct cfg80211_assoc_request *req)
2207 {
2208 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2209 struct ieee80211_mgd_work *wk, *found = NULL;
2210 int i, err;
2211
2212 mutex_lock(&ifmgd->mtx);
2213
2214 list_for_each_entry(wk, &ifmgd->work_list, list) {
2215 if (&wk->bss->cbss == req->bss &&
2216 wk->state == IEEE80211_MGD_STATE_IDLE) {
2217 found = wk;
2218 break;
2219 }
2220 }
2221
2222 if (!found) {
2223 err = -ENOLINK;
2224 goto out;
2225 }
2226
2227 list_del(&found->list);
2228
2229 wk = krealloc(found, sizeof(*wk) + req->ie_len, GFP_KERNEL);
2230 if (!wk) {
2231 list_add(&found->list, &ifmgd->work_list);
2232 err = -ENOMEM;
2233 goto out;
2234 }
2235
2236 list_add(&wk->list, &ifmgd->work_list);
2237
2238 ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2239
2240 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2241 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2242 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2243 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2244 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2245
2246 sdata->local->oper_channel = req->bss->channel;
2247 ieee80211_hw_config(sdata->local, 0);
2248
2249 if (req->ie && req->ie_len) {
2250 memcpy(wk->ie, req->ie, req->ie_len);
2251 wk->ie_len = req->ie_len;
2252 } else
2253 wk->ie_len = 0;
2254
2255 if (req->prev_bssid)
2256 memcpy(wk->prev_bssid, req->prev_bssid, ETH_ALEN);
2257
2258 wk->state = IEEE80211_MGD_STATE_ASSOC;
2259 wk->tries = 0;
2260
2261 if (req->use_mfp) {
2262 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2263 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2264 } else {
2265 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2266 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2267 }
2268
2269 if (req->crypto.control_port)
2270 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2271 else
2272 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2273
2274 queue_work(sdata->local->hw.workqueue, &sdata->u.mgd.work);
2275
2276 err = 0;
2277
2278 out:
2279 mutex_unlock(&ifmgd->mtx);
2280 return err;
2281 }
2282
2283 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2284 struct cfg80211_deauth_request *req)
2285 {
2286 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2287 struct ieee80211_mgd_work *wk;
2288 const u8 *bssid = NULL;
2289
2290 printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2291 sdata->dev->name, req->reason_code);
2292
2293 mutex_lock(&ifmgd->mtx);
2294
2295 if (ifmgd->associated && &ifmgd->associated->cbss == req->bss) {
2296 bssid = req->bss->bssid;
2297 ieee80211_set_disassoc(sdata, bssid, true);
2298 } else list_for_each_entry(wk, &ifmgd->work_list, list) {
2299 if (&wk->bss->cbss == req->bss) {
2300 bssid = req->bss->bssid;
2301 list_del(&wk->list);
2302 kfree(wk);
2303 break;
2304 }
2305 }
2306
2307 /* cfg80211 should catch this... */
2308 if (WARN_ON(!bssid)) {
2309 mutex_unlock(&ifmgd->mtx);
2310 return -ENOLINK;
2311 }
2312
2313 mutex_unlock(&ifmgd->mtx);
2314
2315 ieee80211_send_deauth_disassoc(sdata, bssid,
2316 IEEE80211_STYPE_DEAUTH, req->reason_code);
2317
2318 return 0;
2319 }
2320
2321 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2322 struct cfg80211_disassoc_request *req)
2323 {
2324 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2325
2326 printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2327 sdata->dev->name, req->reason_code);
2328
2329 mutex_lock(&ifmgd->mtx);
2330
2331 /* cfg80211 should catch that */
2332 if (WARN_ON(&ifmgd->associated->cbss != req->bss)) {
2333 mutex_unlock(&ifmgd->mtx);
2334 return -ENOLINK;
2335 }
2336
2337 ieee80211_set_disassoc(sdata, req->bss->bssid, false);
2338
2339 mutex_unlock(&ifmgd->mtx);
2340
2341 ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2342 IEEE80211_STYPE_DISASSOC, req->reason_code);
2343 return 0;
2344 }
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