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/moduleparam.h>
20 #include <linux/rtnetlink.h>
21 #include <linux/pm_qos.h>
22 #include <linux/crc32.h>
23 #include <linux/slab.h>
24 #include <linux/export.h>
25 #include <net/mac80211.h>
26 #include <asm/unaligned.h>
27
28 #include "ieee80211_i.h"
29 #include "driver-ops.h"
30 #include "rate.h"
31 #include "led.h"
32
33 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
34 #define IEEE80211_AUTH_MAX_TRIES 3
35 #define IEEE80211_AUTH_WAIT_ASSOC (HZ * 5)
36 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
37 #define IEEE80211_ASSOC_MAX_TRIES 3
38
39 static int max_nullfunc_tries = 2;
40 module_param(max_nullfunc_tries, int, 0644);
41 MODULE_PARM_DESC(max_nullfunc_tries,
42 "Maximum nullfunc tx tries before disconnecting (reason 4).");
43
44 static int max_probe_tries = 5;
45 module_param(max_probe_tries, int, 0644);
46 MODULE_PARM_DESC(max_probe_tries,
47 "Maximum probe tries before disconnecting (reason 4).");
48
49 /*
50 * Beacon loss timeout is calculated as N frames times the
51 * advertised beacon interval. This may need to be somewhat
52 * higher than what hardware might detect to account for
53 * delays in the host processing frames. But since we also
54 * probe on beacon miss before declaring the connection lost
55 * default to what we want.
56 */
57 #define IEEE80211_BEACON_LOSS_COUNT 7
58
59 /*
60 * Time the connection can be idle before we probe
61 * it to see if we can still talk to the AP.
62 */
63 #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ)
64 /*
65 * Time we wait for a probe response after sending
66 * a probe request because of beacon loss or for
67 * checking the connection still works.
68 */
69 static int probe_wait_ms = 500;
70 module_param(probe_wait_ms, int, 0644);
71 MODULE_PARM_DESC(probe_wait_ms,
72 "Maximum time(ms) to wait for probe response"
73 " before disconnecting (reason 4).");
74
75 /*
76 * Weight given to the latest Beacon frame when calculating average signal
77 * strength for Beacon frames received in the current BSS. This must be
78 * between 1 and 15.
79 */
80 #define IEEE80211_SIGNAL_AVE_WEIGHT 3
81
82 /*
83 * How many Beacon frames need to have been used in average signal strength
84 * before starting to indicate signal change events.
85 */
86 #define IEEE80211_SIGNAL_AVE_MIN_COUNT 4
87
88 #define TMR_RUNNING_TIMER 0
89 #define TMR_RUNNING_CHANSW 1
90
91 #define DEAUTH_DISASSOC_LEN (24 /* hdr */ + 2 /* reason */)
92
93 /*
94 * All cfg80211 functions have to be called outside a locked
95 * section so that they can acquire a lock themselves... This
96 * is much simpler than queuing up things in cfg80211, but we
97 * do need some indirection for that here.
98 */
99 enum rx_mgmt_action {
100 /* no action required */
101 RX_MGMT_NONE,
102
103 /* caller must call cfg80211_send_deauth() */
104 RX_MGMT_CFG80211_DEAUTH,
105
106 /* caller must call cfg80211_send_disassoc() */
107 RX_MGMT_CFG80211_DISASSOC,
108
109 /* caller must call cfg80211_send_rx_auth() */
110 RX_MGMT_CFG80211_RX_AUTH,
111
112 /* caller must call cfg80211_send_rx_assoc() */
113 RX_MGMT_CFG80211_RX_ASSOC,
114
115 /* caller must call cfg80211_send_assoc_timeout() */
116 RX_MGMT_CFG80211_ASSOC_TIMEOUT,
117 };
118
119 /* utils */
ASSERT_MGD_MTX(struct ieee80211_if_managed * ifmgd)120 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
121 {
122 lockdep_assert_held(&ifmgd->mtx);
123 }
124
125 /*
126 * We can have multiple work items (and connection probing)
127 * scheduling this timer, but we need to take care to only
128 * reschedule it when it should fire _earlier_ than it was
129 * asked for before, or if it's not pending right now. This
130 * function ensures that. Note that it then is required to
131 * run this function for all timeouts after the first one
132 * has happened -- the work that runs from this timer will
133 * do that.
134 */
run_again(struct ieee80211_if_managed * ifmgd,unsigned long timeout)135 static void run_again(struct ieee80211_if_managed *ifmgd, unsigned long timeout)
136 {
137 ASSERT_MGD_MTX(ifmgd);
138
139 if (!timer_pending(&ifmgd->timer) ||
140 time_before(timeout, ifmgd->timer.expires))
141 mod_timer(&ifmgd->timer, timeout);
142 }
143
ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data * sdata)144 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
145 {
146 if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
147 return;
148
149 mod_timer(&sdata->u.mgd.bcn_mon_timer,
150 round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
151 }
152
ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data * sdata)153 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
154 {
155 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
156
157 if (unlikely(!sdata->u.mgd.associated))
158 return;
159
160 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
161 return;
162
163 mod_timer(&sdata->u.mgd.conn_mon_timer,
164 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
165
166 ifmgd->probe_send_count = 0;
167 }
168
ecw2cw(int ecw)169 static int ecw2cw(int ecw)
170 {
171 return (1 << ecw) - 1;
172 }
173
174 /*
175 * ieee80211_enable_ht should be called only after the operating band
176 * has been determined as ht configuration depends on the hw's
177 * HT abilities for a specific band.
178 */
ieee80211_enable_ht(struct ieee80211_sub_if_data * sdata,struct ieee80211_ht_info * hti,const u8 * bssid,u16 ap_ht_cap_flags,bool beacon_htcap_ie)179 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
180 struct ieee80211_ht_info *hti,
181 const u8 *bssid, u16 ap_ht_cap_flags,
182 bool beacon_htcap_ie)
183 {
184 struct ieee80211_local *local = sdata->local;
185 struct ieee80211_supported_band *sband;
186 struct sta_info *sta;
187 u32 changed = 0;
188 int hti_cfreq;
189 u16 ht_opmode;
190 bool enable_ht = true, queues_stopped = false;
191 enum nl80211_channel_type prev_chantype;
192 enum nl80211_channel_type rx_channel_type = NL80211_CHAN_NO_HT;
193 enum nl80211_channel_type tx_channel_type;
194
195 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
196 prev_chantype = sdata->vif.bss_conf.channel_type;
197
198
199 hti_cfreq = ieee80211_channel_to_frequency(hti->control_chan,
200 sband->band);
201 /* check that channel matches the right operating channel */
202 if (local->hw.conf.channel->center_freq != hti_cfreq) {
203 /* Some APs mess this up, evidently.
204 * Netgear WNDR3700 sometimes reports 4 higher than
205 * the actual channel, for instance.
206 */
207 printk(KERN_DEBUG
208 "%s: Wrong control channel in association"
209 " response: configured center-freq: %d"
210 " hti-cfreq: %d hti->control_chan: %d"
211 " band: %d. Disabling HT.\n",
212 sdata->name,
213 local->hw.conf.channel->center_freq,
214 hti_cfreq, hti->control_chan,
215 sband->band);
216 enable_ht = false;
217 }
218
219 if (enable_ht) {
220 rx_channel_type = NL80211_CHAN_HT20;
221
222 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
223 !ieee80111_cfg_override_disables_ht40(sdata) &&
224 (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
225 (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
226 switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
227 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
228 rx_channel_type = NL80211_CHAN_HT40PLUS;
229 break;
230 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
231 rx_channel_type = NL80211_CHAN_HT40MINUS;
232 break;
233 }
234 }
235 }
236
237 tx_channel_type = ieee80211_get_tx_channel_type(local, rx_channel_type);
238
239 if (local->tmp_channel)
240 local->tmp_channel_type = rx_channel_type;
241
242 if (!ieee80211_set_channel_type(local, sdata, rx_channel_type)) {
243 /* can only fail due to HT40+/- mismatch */
244 rx_channel_type = NL80211_CHAN_HT20;
245 WARN_ON(!ieee80211_set_channel_type(local, sdata,
246 rx_channel_type));
247 }
248
249 if (beacon_htcap_ie && (prev_chantype != rx_channel_type)) {
250 /*
251 * Whenever the AP announces the HT mode change that can be
252 * 40MHz intolerant or etc., it would be safer to stop tx
253 * queues before doing hw config to avoid buffer overflow.
254 */
255 ieee80211_stop_queues_by_reason(&sdata->local->hw,
256 IEEE80211_QUEUE_STOP_REASON_CHTYPE_CHANGE);
257 queues_stopped = true;
258
259 /* flush out all packets */
260 synchronize_net();
261
262 drv_flush(local, false);
263 }
264
265 /* channel_type change automatically detected */
266 ieee80211_hw_config(local, 0);
267
268 if (prev_chantype != tx_channel_type) {
269 rcu_read_lock();
270 sta = sta_info_get(sdata, bssid);
271 if (sta)
272 rate_control_rate_update(local, sband, sta,
273 IEEE80211_RC_HT_CHANGED,
274 tx_channel_type);
275 rcu_read_unlock();
276 }
277
278 if (queues_stopped)
279 ieee80211_wake_queues_by_reason(&sdata->local->hw,
280 IEEE80211_QUEUE_STOP_REASON_CHTYPE_CHANGE);
281
282 ht_opmode = le16_to_cpu(hti->operation_mode);
283
284 /* if bss configuration changed store the new one */
285 if (sdata->ht_opmode_valid != enable_ht ||
286 sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
287 prev_chantype != rx_channel_type) {
288 changed |= BSS_CHANGED_HT;
289 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
290 sdata->ht_opmode_valid = enable_ht;
291 }
292
293 return changed;
294 }
295
296 /* frame sending functions */
297
ieee80211_compatible_rates(const u8 * supp_rates,int supp_rates_len,struct ieee80211_supported_band * sband,u32 * rates)298 static int ieee80211_compatible_rates(const u8 *supp_rates, int supp_rates_len,
299 struct ieee80211_supported_band *sband,
300 u32 *rates)
301 {
302 int i, j, count;
303 *rates = 0;
304 count = 0;
305 for (i = 0; i < supp_rates_len; i++) {
306 int rate = (supp_rates[i] & 0x7F) * 5;
307
308 for (j = 0; j < sband->n_bitrates; j++)
309 if (sband->bitrates[j].bitrate == rate) {
310 *rates |= BIT(j);
311 count++;
312 break;
313 }
314 }
315
316 return count;
317 }
318
ieee80211_add_ht_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,const u8 * ht_info_ie,struct ieee80211_supported_band * sband,struct ieee80211_channel * channel,enum ieee80211_smps_mode smps)319 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
320 struct sk_buff *skb, const u8 *ht_info_ie,
321 struct ieee80211_supported_band *sband,
322 struct ieee80211_channel *channel,
323 enum ieee80211_smps_mode smps)
324 {
325 struct ieee80211_ht_info *ht_info;
326 u8 *pos;
327 u32 flags = channel->flags;
328 u16 cap;
329 struct ieee80211_sta_ht_cap ht_cap;
330
331 BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
332
333 if (!ht_info_ie)
334 return;
335
336 if (ht_info_ie[1] < sizeof(struct ieee80211_ht_info))
337 return;
338
339 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
340 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
341
342 ht_info = (struct ieee80211_ht_info *)(ht_info_ie + 2);
343
344 /* determine capability flags */
345 cap = ht_cap.cap;
346
347 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
348 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
349 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
350 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
351 cap &= ~IEEE80211_HT_CAP_SGI_40;
352 }
353 break;
354 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
355 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
356 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
357 cap &= ~IEEE80211_HT_CAP_SGI_40;
358 }
359 break;
360 }
361
362 /* set SM PS mode properly */
363 cap &= ~IEEE80211_HT_CAP_SM_PS;
364 switch (smps) {
365 case IEEE80211_SMPS_AUTOMATIC:
366 case IEEE80211_SMPS_NUM_MODES:
367 WARN_ON(1);
368 case IEEE80211_SMPS_OFF:
369 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
370 IEEE80211_HT_CAP_SM_PS_SHIFT;
371 break;
372 case IEEE80211_SMPS_STATIC:
373 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
374 IEEE80211_HT_CAP_SM_PS_SHIFT;
375 break;
376 case IEEE80211_SMPS_DYNAMIC:
377 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
378 IEEE80211_HT_CAP_SM_PS_SHIFT;
379 break;
380 }
381
382 /* reserve and fill IE */
383 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
384 ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
385 }
386
ieee80211_send_assoc(struct ieee80211_sub_if_data * sdata)387 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
388 {
389 struct ieee80211_local *local = sdata->local;
390 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
391 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
392 struct sk_buff *skb;
393 struct ieee80211_mgmt *mgmt;
394 u8 *pos, qos_info;
395 size_t offset = 0, noffset;
396 int i, count, rates_len, supp_rates_len;
397 u16 capab;
398 struct ieee80211_supported_band *sband;
399 u32 rates = 0;
400
401 lockdep_assert_held(&ifmgd->mtx);
402
403 sband = local->hw.wiphy->bands[local->oper_channel->band];
404
405 if (assoc_data->supp_rates_len) {
406 /*
407 * Get all rates supported by the device and the AP as
408 * some APs don't like getting a superset of their rates
409 * in the association request (e.g. D-Link DAP 1353 in
410 * b-only mode)...
411 */
412 rates_len = ieee80211_compatible_rates(assoc_data->supp_rates,
413 assoc_data->supp_rates_len,
414 sband, &rates);
415 } else {
416 /*
417 * In case AP not provide any supported rates information
418 * before association, we send information element(s) with
419 * all rates that we support.
420 */
421 rates = ~0;
422 rates_len = sband->n_bitrates;
423 }
424
425 skb = alloc_skb(local->hw.extra_tx_headroom +
426 sizeof(*mgmt) + /* bit too much but doesn't matter */
427 2 + assoc_data->ssid_len + /* SSID */
428 4 + rates_len + /* (extended) rates */
429 4 + /* power capability */
430 2 + 2 * sband->n_channels + /* supported channels */
431 2 + sizeof(struct ieee80211_ht_cap) + /* HT */
432 assoc_data->ie_len + /* extra IEs */
433 9, /* WMM */
434 GFP_KERNEL);
435 if (!skb)
436 return;
437
438 skb_reserve(skb, local->hw.extra_tx_headroom);
439
440 capab = WLAN_CAPABILITY_ESS;
441
442 if (sband->band == IEEE80211_BAND_2GHZ) {
443 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
444 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
445 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
446 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
447 }
448
449 if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
450 capab |= WLAN_CAPABILITY_PRIVACY;
451
452 if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
453 (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
454 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
455
456 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
457 memset(mgmt, 0, 24);
458 memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
459 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
460 memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
461
462 if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
463 skb_put(skb, 10);
464 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
465 IEEE80211_STYPE_REASSOC_REQ);
466 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
467 mgmt->u.reassoc_req.listen_interval =
468 cpu_to_le16(local->hw.conf.listen_interval);
469 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
470 ETH_ALEN);
471 } else {
472 skb_put(skb, 4);
473 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
474 IEEE80211_STYPE_ASSOC_REQ);
475 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
476 mgmt->u.assoc_req.listen_interval =
477 cpu_to_le16(local->hw.conf.listen_interval);
478 }
479
480 /* SSID */
481 pos = skb_put(skb, 2 + assoc_data->ssid_len);
482 *pos++ = WLAN_EID_SSID;
483 *pos++ = assoc_data->ssid_len;
484 memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
485
486 /* add all rates which were marked to be used above */
487 supp_rates_len = rates_len;
488 if (supp_rates_len > 8)
489 supp_rates_len = 8;
490
491 pos = skb_put(skb, supp_rates_len + 2);
492 *pos++ = WLAN_EID_SUPP_RATES;
493 *pos++ = supp_rates_len;
494
495 count = 0;
496 for (i = 0; i < sband->n_bitrates; i++) {
497 if (BIT(i) & rates) {
498 int rate = sband->bitrates[i].bitrate;
499 *pos++ = (u8) (rate / 5);
500 if (++count == 8)
501 break;
502 }
503 }
504
505 if (rates_len > count) {
506 pos = skb_put(skb, rates_len - count + 2);
507 *pos++ = WLAN_EID_EXT_SUPP_RATES;
508 *pos++ = rates_len - count;
509
510 for (i++; i < sband->n_bitrates; i++) {
511 if (BIT(i) & rates) {
512 int rate = sband->bitrates[i].bitrate;
513 *pos++ = (u8) (rate / 5);
514 }
515 }
516 }
517
518 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
519 /* 1. power capabilities */
520 pos = skb_put(skb, 4);
521 *pos++ = WLAN_EID_PWR_CAPABILITY;
522 *pos++ = 2;
523 *pos++ = 0; /* min tx power */
524 *pos++ = local->oper_channel->max_power; /* max tx power */
525
526 /* 2. supported channels */
527 /* TODO: get this in reg domain format */
528 pos = skb_put(skb, 2 * sband->n_channels + 2);
529 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
530 *pos++ = 2 * sband->n_channels;
531 for (i = 0; i < sband->n_channels; i++) {
532 *pos++ = ieee80211_frequency_to_channel(
533 sband->channels[i].center_freq);
534 *pos++ = 1; /* one channel in the subband*/
535 }
536 }
537
538 /* if present, add any custom IEs that go before HT */
539 if (assoc_data->ie_len && assoc_data->ie) {
540 static const u8 before_ht[] = {
541 WLAN_EID_SSID,
542 WLAN_EID_SUPP_RATES,
543 WLAN_EID_EXT_SUPP_RATES,
544 WLAN_EID_PWR_CAPABILITY,
545 WLAN_EID_SUPPORTED_CHANNELS,
546 WLAN_EID_RSN,
547 WLAN_EID_QOS_CAPA,
548 WLAN_EID_RRM_ENABLED_CAPABILITIES,
549 WLAN_EID_MOBILITY_DOMAIN,
550 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
551 };
552 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
553 before_ht, ARRAY_SIZE(before_ht),
554 offset);
555 pos = skb_put(skb, noffset - offset);
556 memcpy(pos, assoc_data->ie + offset, noffset - offset);
557 offset = noffset;
558 }
559
560 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
561 ieee80211_add_ht_ie(sdata, skb, assoc_data->ht_information_ie,
562 sband, local->oper_channel, ifmgd->ap_smps);
563
564 /* if present, add any custom non-vendor IEs that go after HT */
565 if (assoc_data->ie_len && assoc_data->ie) {
566 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
567 assoc_data->ie_len,
568 offset);
569 pos = skb_put(skb, noffset - offset);
570 memcpy(pos, assoc_data->ie + offset, noffset - offset);
571 offset = noffset;
572 }
573
574 if (assoc_data->wmm) {
575 if (assoc_data->uapsd) {
576 qos_info = ifmgd->uapsd_queues;
577 qos_info |= (ifmgd->uapsd_max_sp_len <<
578 IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
579 } else {
580 qos_info = 0;
581 }
582
583 pos = skb_put(skb, 9);
584 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
585 *pos++ = 7; /* len */
586 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
587 *pos++ = 0x50;
588 *pos++ = 0xf2;
589 *pos++ = 2; /* WME */
590 *pos++ = 0; /* WME info */
591 *pos++ = 1; /* WME ver */
592 *pos++ = qos_info;
593 }
594
595 /* add any remaining custom (i.e. vendor specific here) IEs */
596 if (assoc_data->ie_len && assoc_data->ie) {
597 noffset = assoc_data->ie_len;
598 pos = skb_put(skb, noffset - offset);
599 memcpy(pos, assoc_data->ie + offset, noffset - offset);
600 }
601
602 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
603 ieee80211_tx_skb(sdata, skb);
604 }
605
ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data * sdata,const u8 * bssid,u16 stype,u16 reason,bool send_frame,u8 * frame_buf)606 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
607 const u8 *bssid, u16 stype,
608 u16 reason, bool send_frame,
609 u8 *frame_buf)
610 {
611 struct ieee80211_local *local = sdata->local;
612 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
613 struct sk_buff *skb;
614 struct ieee80211_mgmt *mgmt = (void *)frame_buf;
615
616 /* build frame */
617 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
618 mgmt->duration = 0; /* initialize only */
619 mgmt->seq_ctrl = 0; /* initialize only */
620 memcpy(mgmt->da, bssid, ETH_ALEN);
621 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
622 memcpy(mgmt->bssid, bssid, ETH_ALEN);
623 /* u.deauth.reason_code == u.disassoc.reason_code */
624 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
625
626 if (send_frame) {
627 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
628 DEAUTH_DISASSOC_LEN);
629 if (!skb)
630 return;
631
632 skb_reserve(skb, local->hw.extra_tx_headroom);
633
634 /* copy in frame */
635 memcpy(skb_put(skb, DEAUTH_DISASSOC_LEN),
636 mgmt, DEAUTH_DISASSOC_LEN);
637
638 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
639 IEEE80211_SKB_CB(skb)->flags |=
640 IEEE80211_TX_INTFL_DONT_ENCRYPT;
641 ieee80211_tx_skb(sdata, skb);
642 }
643 }
644
ieee80211_send_pspoll(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata)645 void ieee80211_send_pspoll(struct ieee80211_local *local,
646 struct ieee80211_sub_if_data *sdata)
647 {
648 struct ieee80211_pspoll *pspoll;
649 struct sk_buff *skb;
650
651 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
652 if (!skb)
653 return;
654
655 pspoll = (struct ieee80211_pspoll *) skb->data;
656 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
657
658 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
659 ieee80211_tx_skb(sdata, skb);
660 }
661
ieee80211_send_nullfunc(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata,int powersave)662 void ieee80211_send_nullfunc(struct ieee80211_local *local,
663 struct ieee80211_sub_if_data *sdata,
664 int powersave)
665 {
666 struct sk_buff *skb;
667 struct ieee80211_hdr_3addr *nullfunc;
668 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
669
670 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
671 if (!skb)
672 return;
673
674 nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
675 if (powersave)
676 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
677
678 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
679 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
680 IEEE80211_STA_CONNECTION_POLL))
681 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
682
683 ieee80211_tx_skb(sdata, skb);
684 }
685
ieee80211_send_4addr_nullfunc(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata)686 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
687 struct ieee80211_sub_if_data *sdata)
688 {
689 struct sk_buff *skb;
690 struct ieee80211_hdr *nullfunc;
691 __le16 fc;
692
693 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
694 return;
695
696 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
697 if (!skb)
698 return;
699
700 skb_reserve(skb, local->hw.extra_tx_headroom);
701
702 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
703 memset(nullfunc, 0, 30);
704 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
705 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
706 nullfunc->frame_control = fc;
707 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
708 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
709 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
710 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
711
712 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
713 ieee80211_tx_skb(sdata, skb);
714 }
715
716 /* spectrum management related things */
ieee80211_chswitch_work(struct work_struct * work)717 static void ieee80211_chswitch_work(struct work_struct *work)
718 {
719 struct ieee80211_sub_if_data *sdata =
720 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
721 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
722
723 if (!ieee80211_sdata_running(sdata))
724 return;
725
726 mutex_lock(&ifmgd->mtx);
727 if (!ifmgd->associated)
728 goto out;
729
730 sdata->local->oper_channel = sdata->local->csa_channel;
731 if (!sdata->local->ops->channel_switch) {
732 /* call "hw_config" only if doing sw channel switch */
733 ieee80211_hw_config(sdata->local,
734 IEEE80211_CONF_CHANGE_CHANNEL);
735 } else {
736 /* update the device channel directly */
737 sdata->local->hw.conf.channel = sdata->local->oper_channel;
738 }
739
740 /* XXX: shouldn't really modify cfg80211-owned data! */
741 ifmgd->associated->channel = sdata->local->oper_channel;
742
743 ieee80211_wake_queues_by_reason(&sdata->local->hw,
744 IEEE80211_QUEUE_STOP_REASON_CSA);
745 out:
746 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
747 mutex_unlock(&ifmgd->mtx);
748 }
749
ieee80211_chswitch_done(struct ieee80211_vif * vif,bool success)750 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
751 {
752 struct ieee80211_sub_if_data *sdata;
753 struct ieee80211_if_managed *ifmgd;
754
755 sdata = vif_to_sdata(vif);
756 ifmgd = &sdata->u.mgd;
757
758 trace_api_chswitch_done(sdata, success);
759 if (!success) {
760 /*
761 * If the channel switch was not successful, stay
762 * around on the old channel. We currently lack
763 * good handling of this situation, possibly we
764 * should just drop the association.
765 */
766 sdata->local->csa_channel = sdata->local->oper_channel;
767 }
768
769 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
770 }
771 EXPORT_SYMBOL(ieee80211_chswitch_done);
772
ieee80211_chswitch_timer(unsigned long data)773 static void ieee80211_chswitch_timer(unsigned long data)
774 {
775 struct ieee80211_sub_if_data *sdata =
776 (struct ieee80211_sub_if_data *) data;
777 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
778
779 if (sdata->local->quiescing) {
780 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
781 return;
782 }
783
784 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
785 }
786
ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data * sdata,struct ieee80211_channel_sw_ie * sw_elem,struct ieee80211_bss * bss,u64 timestamp)787 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
788 struct ieee80211_channel_sw_ie *sw_elem,
789 struct ieee80211_bss *bss,
790 u64 timestamp)
791 {
792 struct cfg80211_bss *cbss =
793 container_of((void *)bss, struct cfg80211_bss, priv);
794 struct ieee80211_channel *new_ch;
795 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
796 int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
797 cbss->channel->band);
798
799 ASSERT_MGD_MTX(ifmgd);
800
801 if (!ifmgd->associated)
802 return;
803
804 if (sdata->local->scanning)
805 return;
806
807 /* Disregard subsequent beacons if we are already running a timer
808 processing a CSA */
809
810 if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
811 return;
812
813 new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
814 if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
815 return;
816
817 sdata->local->csa_channel = new_ch;
818
819 if (sdata->local->ops->channel_switch) {
820 /* use driver's channel switch callback */
821 struct ieee80211_channel_switch ch_switch;
822 memset(&ch_switch, 0, sizeof(ch_switch));
823 ch_switch.timestamp = timestamp;
824 if (sw_elem->mode) {
825 ch_switch.block_tx = true;
826 ieee80211_stop_queues_by_reason(&sdata->local->hw,
827 IEEE80211_QUEUE_STOP_REASON_CSA);
828 }
829 ch_switch.channel = new_ch;
830 ch_switch.count = sw_elem->count;
831 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
832 drv_channel_switch(sdata->local, &ch_switch);
833 return;
834 }
835
836 /* channel switch handled in software */
837 if (sw_elem->count <= 1) {
838 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
839 } else {
840 if (sw_elem->mode)
841 ieee80211_stop_queues_by_reason(&sdata->local->hw,
842 IEEE80211_QUEUE_STOP_REASON_CSA);
843 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
844 mod_timer(&ifmgd->chswitch_timer,
845 jiffies +
846 msecs_to_jiffies(sw_elem->count *
847 cbss->beacon_interval));
848 }
849 }
850
ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data * sdata,u16 capab_info,u8 * pwr_constr_elem,u8 pwr_constr_elem_len)851 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
852 u16 capab_info, u8 *pwr_constr_elem,
853 u8 pwr_constr_elem_len)
854 {
855 struct ieee80211_conf *conf = &sdata->local->hw.conf;
856
857 if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
858 return;
859
860 /* Power constraint IE length should be 1 octet */
861 if (pwr_constr_elem_len != 1)
862 return;
863
864 if ((*pwr_constr_elem <= conf->channel->max_reg_power) &&
865 (*pwr_constr_elem != sdata->local->power_constr_level)) {
866 sdata->local->power_constr_level = *pwr_constr_elem;
867 ieee80211_hw_config(sdata->local, 0);
868 }
869 }
870
ieee80211_enable_dyn_ps(struct ieee80211_vif * vif)871 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
872 {
873 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
874 struct ieee80211_local *local = sdata->local;
875 struct ieee80211_conf *conf = &local->hw.conf;
876
877 WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
878 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
879 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
880
881 local->disable_dynamic_ps = false;
882 conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
883 }
884 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
885
ieee80211_disable_dyn_ps(struct ieee80211_vif * vif)886 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
887 {
888 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
889 struct ieee80211_local *local = sdata->local;
890 struct ieee80211_conf *conf = &local->hw.conf;
891
892 WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
893 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
894 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
895
896 local->disable_dynamic_ps = true;
897 conf->dynamic_ps_timeout = 0;
898 del_timer_sync(&local->dynamic_ps_timer);
899 ieee80211_queue_work(&local->hw,
900 &local->dynamic_ps_enable_work);
901 }
902 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
903
904 /* powersave */
ieee80211_enable_ps(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata)905 static void ieee80211_enable_ps(struct ieee80211_local *local,
906 struct ieee80211_sub_if_data *sdata)
907 {
908 struct ieee80211_conf *conf = &local->hw.conf;
909
910 /*
911 * If we are scanning right now then the parameters will
912 * take effect when scan finishes.
913 */
914 if (local->scanning)
915 return;
916
917 if (conf->dynamic_ps_timeout > 0 &&
918 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
919 mod_timer(&local->dynamic_ps_timer, jiffies +
920 msecs_to_jiffies(conf->dynamic_ps_timeout));
921 } else {
922 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
923 ieee80211_send_nullfunc(local, sdata, 1);
924
925 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
926 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
927 return;
928
929 conf->flags |= IEEE80211_CONF_PS;
930 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
931 }
932 }
933
ieee80211_change_ps(struct ieee80211_local * local)934 static void ieee80211_change_ps(struct ieee80211_local *local)
935 {
936 struct ieee80211_conf *conf = &local->hw.conf;
937
938 if (local->ps_sdata) {
939 ieee80211_enable_ps(local, local->ps_sdata);
940 } else if (conf->flags & IEEE80211_CONF_PS) {
941 conf->flags &= ~IEEE80211_CONF_PS;
942 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
943 del_timer_sync(&local->dynamic_ps_timer);
944 cancel_work_sync(&local->dynamic_ps_enable_work);
945 }
946 }
947
ieee80211_powersave_allowed(struct ieee80211_sub_if_data * sdata)948 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
949 {
950 struct ieee80211_if_managed *mgd = &sdata->u.mgd;
951 struct sta_info *sta = NULL;
952 bool authorized = false;
953
954 if (!mgd->powersave)
955 return false;
956
957 if (mgd->broken_ap)
958 return false;
959
960 if (!mgd->associated)
961 return false;
962
963 if (!mgd->associated->beacon_ies)
964 return false;
965
966 if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
967 IEEE80211_STA_CONNECTION_POLL))
968 return false;
969
970 rcu_read_lock();
971 sta = sta_info_get(sdata, mgd->bssid);
972 if (sta)
973 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
974 rcu_read_unlock();
975
976 return authorized;
977 }
978
979 /* need to hold RTNL or interface lock */
ieee80211_recalc_ps(struct ieee80211_local * local,s32 latency)980 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
981 {
982 struct ieee80211_sub_if_data *sdata, *found = NULL;
983 int count = 0;
984 int timeout;
985
986 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
987 local->ps_sdata = NULL;
988 return;
989 }
990
991 if (!list_empty(&local->work_list)) {
992 local->ps_sdata = NULL;
993 goto change;
994 }
995
996 list_for_each_entry(sdata, &local->interfaces, list) {
997 if (!ieee80211_sdata_running(sdata))
998 continue;
999 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1000 /* If an AP vif is found, then disable PS
1001 * by setting the count to zero thereby setting
1002 * ps_sdata to NULL.
1003 */
1004 count = 0;
1005 break;
1006 }
1007 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1008 continue;
1009 found = sdata;
1010 count++;
1011 }
1012
1013 if (count == 1 && ieee80211_powersave_allowed(found)) {
1014 struct ieee80211_conf *conf = &local->hw.conf;
1015 s32 beaconint_us;
1016
1017 if (latency < 0)
1018 latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1019
1020 beaconint_us = ieee80211_tu_to_usec(
1021 found->vif.bss_conf.beacon_int);
1022
1023 timeout = local->dynamic_ps_forced_timeout;
1024 if (timeout < 0) {
1025 /*
1026 * Go to full PSM if the user configures a very low
1027 * latency requirement.
1028 * The 2000 second value is there for compatibility
1029 * until the PM_QOS_NETWORK_LATENCY is configured
1030 * with real values.
1031 */
1032 if (latency > (1900 * USEC_PER_MSEC) &&
1033 latency != (2000 * USEC_PER_SEC))
1034 timeout = 0;
1035 else
1036 timeout = 100;
1037 }
1038 local->dynamic_ps_user_timeout = timeout;
1039 if (!local->disable_dynamic_ps)
1040 conf->dynamic_ps_timeout =
1041 local->dynamic_ps_user_timeout;
1042
1043 if (beaconint_us > latency) {
1044 local->ps_sdata = NULL;
1045 } else {
1046 struct ieee80211_bss *bss;
1047 int maxslp = 1;
1048 u8 dtimper;
1049
1050 bss = (void *)found->u.mgd.associated->priv;
1051 dtimper = bss->dtim_period;
1052
1053 /* If the TIM IE is invalid, pretend the value is 1 */
1054 if (!dtimper)
1055 dtimper = 1;
1056 else if (dtimper > 1)
1057 maxslp = min_t(int, dtimper,
1058 latency / beaconint_us);
1059
1060 local->hw.conf.max_sleep_period = maxslp;
1061 local->hw.conf.ps_dtim_period = dtimper;
1062 local->ps_sdata = found;
1063 }
1064 } else {
1065 local->ps_sdata = NULL;
1066 }
1067
1068 change:
1069 ieee80211_change_ps(local);
1070 }
1071
ieee80211_dynamic_ps_disable_work(struct work_struct * work)1072 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1073 {
1074 struct ieee80211_local *local =
1075 container_of(work, struct ieee80211_local,
1076 dynamic_ps_disable_work);
1077
1078 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1079 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1080 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1081 }
1082
1083 ieee80211_wake_queues_by_reason(&local->hw,
1084 IEEE80211_QUEUE_STOP_REASON_PS);
1085 }
1086
ieee80211_dynamic_ps_enable_work(struct work_struct * work)1087 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1088 {
1089 struct ieee80211_local *local =
1090 container_of(work, struct ieee80211_local,
1091 dynamic_ps_enable_work);
1092 struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1093 struct ieee80211_if_managed *ifmgd;
1094 unsigned long flags;
1095 int q;
1096
1097 /* can only happen when PS was just disabled anyway */
1098 if (!sdata)
1099 return;
1100
1101 ifmgd = &sdata->u.mgd;
1102
1103 if (local->hw.conf.flags & IEEE80211_CONF_PS)
1104 return;
1105
1106 if (!local->disable_dynamic_ps &&
1107 local->hw.conf.dynamic_ps_timeout > 0) {
1108 /* don't enter PS if TX frames are pending */
1109 if (drv_tx_frames_pending(local)) {
1110 mod_timer(&local->dynamic_ps_timer, jiffies +
1111 msecs_to_jiffies(
1112 local->hw.conf.dynamic_ps_timeout));
1113 return;
1114 }
1115
1116 /*
1117 * transmission can be stopped by others which leads to
1118 * dynamic_ps_timer expiry. Postpone the ps timer if it
1119 * is not the actual idle state.
1120 */
1121 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1122 for (q = 0; q < local->hw.queues; q++) {
1123 if (local->queue_stop_reasons[q]) {
1124 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1125 flags);
1126 mod_timer(&local->dynamic_ps_timer, jiffies +
1127 msecs_to_jiffies(
1128 local->hw.conf.dynamic_ps_timeout));
1129 return;
1130 }
1131 }
1132 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1133 }
1134
1135 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1136 !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1137 netif_tx_stop_all_queues(sdata->dev);
1138
1139 if (drv_tx_frames_pending(local))
1140 mod_timer(&local->dynamic_ps_timer, jiffies +
1141 msecs_to_jiffies(
1142 local->hw.conf.dynamic_ps_timeout));
1143 else {
1144 ieee80211_send_nullfunc(local, sdata, 1);
1145 /* Flush to get the tx status of nullfunc frame */
1146 drv_flush(local, false);
1147 }
1148 }
1149
1150 if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1151 (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1152 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1153 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1154 local->hw.conf.flags |= IEEE80211_CONF_PS;
1155 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1156 }
1157
1158 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1159 netif_tx_wake_all_queues(sdata->dev);
1160 }
1161
ieee80211_dynamic_ps_timer(unsigned long data)1162 void ieee80211_dynamic_ps_timer(unsigned long data)
1163 {
1164 struct ieee80211_local *local = (void *) data;
1165
1166 if (local->quiescing || local->suspended)
1167 return;
1168
1169 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1170 }
1171
1172 /* MLME */
ieee80211_sta_wmm_params(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata,u8 * wmm_param,size_t wmm_param_len)1173 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
1174 struct ieee80211_sub_if_data *sdata,
1175 u8 *wmm_param, size_t wmm_param_len)
1176 {
1177 struct ieee80211_tx_queue_params params;
1178 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1179 size_t left;
1180 int count;
1181 u8 *pos, uapsd_queues = 0;
1182
1183 if (!local->ops->conf_tx)
1184 return;
1185
1186 if (local->hw.queues < 4)
1187 return;
1188
1189 if (!wmm_param)
1190 return;
1191
1192 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1193 return;
1194
1195 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1196 uapsd_queues = ifmgd->uapsd_queues;
1197
1198 count = wmm_param[6] & 0x0f;
1199 if (count == ifmgd->wmm_last_param_set)
1200 return;
1201 ifmgd->wmm_last_param_set = count;
1202
1203 pos = wmm_param + 8;
1204 left = wmm_param_len - 8;
1205
1206 memset(¶ms, 0, sizeof(params));
1207
1208 local->wmm_acm = 0;
1209 for (; left >= 4; left -= 4, pos += 4) {
1210 int aci = (pos[0] >> 5) & 0x03;
1211 int acm = (pos[0] >> 4) & 0x01;
1212 bool uapsd = false;
1213 int queue;
1214
1215 switch (aci) {
1216 case 1: /* AC_BK */
1217 queue = 3;
1218 if (acm)
1219 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1220 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1221 uapsd = true;
1222 break;
1223 case 2: /* AC_VI */
1224 queue = 1;
1225 if (acm)
1226 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1227 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1228 uapsd = true;
1229 break;
1230 case 3: /* AC_VO */
1231 queue = 0;
1232 if (acm)
1233 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1234 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1235 uapsd = true;
1236 break;
1237 case 0: /* AC_BE */
1238 default:
1239 queue = 2;
1240 if (acm)
1241 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1242 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1243 uapsd = true;
1244 break;
1245 }
1246
1247 params.aifs = pos[0] & 0x0f;
1248 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1249 params.cw_min = ecw2cw(pos[1] & 0x0f);
1250 params.txop = get_unaligned_le16(pos + 2);
1251 params.uapsd = uapsd;
1252
1253 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1254 wiphy_debug(local->hw.wiphy,
1255 "WMM queue=%d aci=%d acm=%d aifs=%d "
1256 "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1257 queue, aci, acm,
1258 params.aifs, params.cw_min, params.cw_max,
1259 params.txop, params.uapsd);
1260 #endif
1261 sdata->tx_conf[queue] = params;
1262 if (drv_conf_tx(local, sdata, queue, ¶ms))
1263 wiphy_debug(local->hw.wiphy,
1264 "failed to set TX queue parameters for queue %d\n",
1265 queue);
1266 }
1267
1268 /* enable WMM or activate new settings */
1269 sdata->vif.bss_conf.qos = true;
1270 }
1271
ieee80211_handle_bss_capability(struct ieee80211_sub_if_data * sdata,u16 capab,bool erp_valid,u8 erp)1272 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1273 u16 capab, bool erp_valid, u8 erp)
1274 {
1275 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1276 u32 changed = 0;
1277 bool use_protection;
1278 bool use_short_preamble;
1279 bool use_short_slot;
1280
1281 if (erp_valid) {
1282 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1283 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1284 } else {
1285 use_protection = false;
1286 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1287 }
1288
1289 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1290 if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
1291 use_short_slot = true;
1292
1293 if (use_protection != bss_conf->use_cts_prot) {
1294 bss_conf->use_cts_prot = use_protection;
1295 changed |= BSS_CHANGED_ERP_CTS_PROT;
1296 }
1297
1298 if (use_short_preamble != bss_conf->use_short_preamble) {
1299 bss_conf->use_short_preamble = use_short_preamble;
1300 changed |= BSS_CHANGED_ERP_PREAMBLE;
1301 }
1302
1303 if (use_short_slot != bss_conf->use_short_slot) {
1304 bss_conf->use_short_slot = use_short_slot;
1305 changed |= BSS_CHANGED_ERP_SLOT;
1306 }
1307
1308 return changed;
1309 }
1310
ieee80211_set_associated(struct ieee80211_sub_if_data * sdata,struct cfg80211_bss * cbss,u32 bss_info_changed)1311 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1312 struct cfg80211_bss *cbss,
1313 u32 bss_info_changed)
1314 {
1315 struct ieee80211_bss *bss = (void *)cbss->priv;
1316 struct ieee80211_local *local = sdata->local;
1317 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1318
1319 bss_info_changed |= BSS_CHANGED_ASSOC;
1320 /* set timing information */
1321 bss_conf->beacon_int = cbss->beacon_interval;
1322 bss_conf->last_tsf = cbss->tsf;
1323
1324 bss_info_changed |= BSS_CHANGED_BEACON_INT;
1325 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1326 cbss->capability, bss->has_erp_value, bss->erp_value);
1327
1328 sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1329 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
1330
1331 sdata->u.mgd.associated = cbss;
1332 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1333
1334 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1335
1336 /* just to be sure */
1337 sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1338 IEEE80211_STA_BEACON_POLL);
1339
1340 ieee80211_led_assoc(local, 1);
1341
1342 if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
1343 bss_conf->dtim_period = bss->dtim_period;
1344 else
1345 bss_conf->dtim_period = 0;
1346
1347 bss_conf->assoc = 1;
1348
1349 /* Tell the driver to monitor connection quality (if supported) */
1350 if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1351 bss_conf->cqm_rssi_thold)
1352 bss_info_changed |= BSS_CHANGED_CQM;
1353
1354 /* Enable ARP filtering */
1355 if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
1356 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
1357 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1358 }
1359
1360 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1361
1362 mutex_lock(&local->iflist_mtx);
1363 ieee80211_recalc_ps(local, -1);
1364 ieee80211_recalc_smps(local);
1365 mutex_unlock(&local->iflist_mtx);
1366
1367 netif_tx_start_all_queues(sdata->dev);
1368 netif_carrier_on(sdata->dev);
1369 }
1370
ieee80211_set_disassoc(struct ieee80211_sub_if_data * sdata,u16 stype,u16 reason,bool tx,u8 * frame_buf)1371 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1372 u16 stype, u16 reason, bool tx,
1373 u8 *frame_buf)
1374 {
1375 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1376 struct ieee80211_local *local = sdata->local;
1377 struct sta_info *sta;
1378 u32 changed = 0;
1379
1380 ASSERT_MGD_MTX(ifmgd);
1381
1382 if (WARN_ON_ONCE(tx && !frame_buf))
1383 return;
1384
1385 if (WARN_ON(!ifmgd->associated))
1386 return;
1387
1388 ifmgd->associated = NULL;
1389
1390 /*
1391 * we need to commit the associated = NULL change because the
1392 * scan code uses that to determine whether this iface should
1393 * go to/wake up from powersave or not -- and could otherwise
1394 * wake the queues erroneously.
1395 */
1396 smp_mb();
1397
1398 /*
1399 * Thus, we can only afterwards stop the queues -- to account
1400 * for the case where another CPU is finishing a scan at this
1401 * time -- we don't want the scan code to enable queues.
1402 */
1403
1404 netif_tx_stop_all_queues(sdata->dev);
1405 netif_carrier_off(sdata->dev);
1406
1407 mutex_lock(&local->sta_mtx);
1408 sta = sta_info_get(sdata, ifmgd->bssid);
1409 if (sta) {
1410 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
1411 ieee80211_sta_tear_down_BA_sessions(sta, tx);
1412 }
1413 mutex_unlock(&local->sta_mtx);
1414
1415 /* deauthenticate/disassociate now */
1416 if (tx || frame_buf)
1417 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
1418 reason, tx, frame_buf);
1419
1420 /* flush out frame */
1421 if (tx)
1422 drv_flush(local, false);
1423
1424 /* clear bssid only after building the needed mgmt frames */
1425 memset(ifmgd->bssid, 0, ETH_ALEN);
1426
1427 /* remove AP and TDLS peers */
1428 sta_info_flush(local, sdata);
1429
1430 /* finally reset all BSS / config parameters */
1431 changed |= ieee80211_reset_erp_info(sdata);
1432
1433 ieee80211_led_assoc(local, 0);
1434 changed |= BSS_CHANGED_ASSOC;
1435 sdata->vif.bss_conf.assoc = false;
1436
1437 /* on the next assoc, re-program HT parameters */
1438 sdata->ht_opmode_valid = false;
1439 memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1440 memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1441
1442 local->power_constr_level = 0;
1443
1444 del_timer_sync(&local->dynamic_ps_timer);
1445 cancel_work_sync(&local->dynamic_ps_enable_work);
1446
1447 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1448 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1449 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1450 }
1451 local->ps_sdata = NULL;
1452
1453 /* Disable ARP filtering */
1454 if (sdata->vif.bss_conf.arp_filter_enabled) {
1455 sdata->vif.bss_conf.arp_filter_enabled = false;
1456 changed |= BSS_CHANGED_ARP_FILTER;
1457 }
1458
1459 sdata->vif.bss_conf.qos = false;
1460 changed |= BSS_CHANGED_QOS;
1461
1462 /* The BSSID (not really interesting) and HT changed */
1463 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1464 ieee80211_bss_info_change_notify(sdata, changed);
1465
1466 /* channel(_type) changes are handled by ieee80211_hw_config */
1467 WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
1468 ieee80211_hw_config(local, 0);
1469
1470 /* disassociated - set to defaults now */
1471 ieee80211_set_wmm_default(sdata, false);
1472
1473 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1474 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1475 del_timer_sync(&sdata->u.mgd.timer);
1476 del_timer_sync(&sdata->u.mgd.chswitch_timer);
1477 }
1478
ieee80211_sta_rx_notify(struct ieee80211_sub_if_data * sdata,struct ieee80211_hdr * hdr)1479 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1480 struct ieee80211_hdr *hdr)
1481 {
1482 /*
1483 * We can postpone the mgd.timer whenever receiving unicast frames
1484 * from AP because we know that the connection is working both ways
1485 * at that time. But multicast frames (and hence also beacons) must
1486 * be ignored here, because we need to trigger the timer during
1487 * data idle periods for sending the periodic probe request to the
1488 * AP we're connected to.
1489 */
1490 if (is_multicast_ether_addr(hdr->addr1))
1491 return;
1492
1493 ieee80211_sta_reset_conn_monitor(sdata);
1494 }
1495
ieee80211_reset_ap_probe(struct ieee80211_sub_if_data * sdata)1496 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1497 {
1498 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1499
1500 if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1501 IEEE80211_STA_CONNECTION_POLL)))
1502 return;
1503
1504 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1505 IEEE80211_STA_BEACON_POLL);
1506 mutex_lock(&sdata->local->iflist_mtx);
1507 ieee80211_recalc_ps(sdata->local, -1);
1508 mutex_unlock(&sdata->local->iflist_mtx);
1509
1510 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1511 return;
1512
1513 /*
1514 * We've received a probe response, but are not sure whether
1515 * we have or will be receiving any beacons or data, so let's
1516 * schedule the timers again, just in case.
1517 */
1518 ieee80211_sta_reset_beacon_monitor(sdata);
1519
1520 mod_timer(&ifmgd->conn_mon_timer,
1521 round_jiffies_up(jiffies +
1522 IEEE80211_CONNECTION_IDLE_TIME));
1523 }
1524
ieee80211_sta_tx_notify(struct ieee80211_sub_if_data * sdata,struct ieee80211_hdr * hdr,bool ack)1525 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1526 struct ieee80211_hdr *hdr, bool ack)
1527 {
1528 if (!ieee80211_is_data(hdr->frame_control))
1529 return;
1530
1531 if (ack)
1532 ieee80211_sta_reset_conn_monitor(sdata);
1533
1534 if (ieee80211_is_nullfunc(hdr->frame_control) &&
1535 sdata->u.mgd.probe_send_count > 0) {
1536 if (ack)
1537 sdata->u.mgd.probe_send_count = 0;
1538 else
1539 sdata->u.mgd.nullfunc_failed = true;
1540 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1541 }
1542 }
1543
ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data * sdata)1544 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1545 {
1546 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1547 const u8 *ssid;
1548 u8 *dst = ifmgd->associated->bssid;
1549 u8 unicast_limit = max(1, max_probe_tries - 3);
1550
1551 /*
1552 * Try sending broadcast probe requests for the last three
1553 * probe requests after the first ones failed since some
1554 * buggy APs only support broadcast probe requests.
1555 */
1556 if (ifmgd->probe_send_count >= unicast_limit)
1557 dst = NULL;
1558
1559 /*
1560 * When the hardware reports an accurate Tx ACK status, it's
1561 * better to send a nullfunc frame instead of a probe request,
1562 * as it will kick us off the AP quickly if we aren't associated
1563 * anymore. The timeout will be reset if the frame is ACKed by
1564 * the AP.
1565 */
1566 if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1567 ifmgd->nullfunc_failed = false;
1568 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1569 } else {
1570 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1571 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid[1], NULL, 0,
1572 (u32) -1, true, false);
1573 }
1574
1575 ifmgd->probe_send_count++;
1576 ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1577 run_again(ifmgd, ifmgd->probe_timeout);
1578 }
1579
ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data * sdata,bool beacon)1580 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1581 bool beacon)
1582 {
1583 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1584 bool already = false;
1585
1586 if (!ieee80211_sdata_running(sdata))
1587 return;
1588
1589 if (sdata->local->scanning)
1590 return;
1591
1592 if (sdata->local->tmp_channel)
1593 return;
1594
1595 mutex_lock(&ifmgd->mtx);
1596
1597 if (!ifmgd->associated)
1598 goto out;
1599
1600 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1601 if (beacon && net_ratelimit())
1602 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1603 "- sending probe request\n", sdata->name);
1604 #endif
1605
1606 /*
1607 * The driver/our work has already reported this event or the
1608 * connection monitoring has kicked in and we have already sent
1609 * a probe request. Or maybe the AP died and the driver keeps
1610 * reporting until we disassociate...
1611 *
1612 * In either case we have to ignore the current call to this
1613 * function (except for setting the correct probe reason bit)
1614 * because otherwise we would reset the timer every time and
1615 * never check whether we received a probe response!
1616 */
1617 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1618 IEEE80211_STA_CONNECTION_POLL))
1619 already = true;
1620
1621 if (beacon)
1622 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1623 else
1624 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1625
1626 if (already)
1627 goto out;
1628
1629 mutex_lock(&sdata->local->iflist_mtx);
1630 ieee80211_recalc_ps(sdata->local, -1);
1631 mutex_unlock(&sdata->local->iflist_mtx);
1632
1633 ifmgd->probe_send_count = 0;
1634 ieee80211_mgd_probe_ap_send(sdata);
1635 out:
1636 mutex_unlock(&ifmgd->mtx);
1637 }
1638
ieee80211_ap_probereq_get(struct ieee80211_hw * hw,struct ieee80211_vif * vif)1639 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1640 struct ieee80211_vif *vif)
1641 {
1642 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1643 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1644 struct sk_buff *skb;
1645 const u8 *ssid;
1646
1647 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1648 return NULL;
1649
1650 ASSERT_MGD_MTX(ifmgd);
1651
1652 if (!ifmgd->associated)
1653 return NULL;
1654
1655 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1656 skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid,
1657 (u32) -1, ssid + 2, ssid[1],
1658 NULL, 0, true);
1659
1660 return skb;
1661 }
1662 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1663
__ieee80211_connection_loss(struct ieee80211_sub_if_data * sdata)1664 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1665 {
1666 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1667 struct ieee80211_local *local = sdata->local;
1668 u8 bssid[ETH_ALEN];
1669 u8 frame_buf[DEAUTH_DISASSOC_LEN];
1670
1671 mutex_lock(&ifmgd->mtx);
1672 if (!ifmgd->associated) {
1673 mutex_unlock(&ifmgd->mtx);
1674 return;
1675 }
1676
1677 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1678
1679 printk(KERN_DEBUG "%s: Connection to AP %pM lost.\n",
1680 sdata->name, bssid);
1681
1682 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
1683 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1684 false, frame_buf);
1685 mutex_unlock(&ifmgd->mtx);
1686
1687 /*
1688 * must be outside lock due to cfg80211,
1689 * but that's not a problem.
1690 */
1691 cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
1692
1693 mutex_lock(&local->mtx);
1694 ieee80211_recalc_idle(local);
1695 mutex_unlock(&local->mtx);
1696 }
1697
ieee80211_beacon_connection_loss_work(struct work_struct * work)1698 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1699 {
1700 struct ieee80211_sub_if_data *sdata =
1701 container_of(work, struct ieee80211_sub_if_data,
1702 u.mgd.beacon_connection_loss_work);
1703 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1704 struct sta_info *sta;
1705
1706 if (ifmgd->associated) {
1707 rcu_read_lock();
1708 sta = sta_info_get(sdata, ifmgd->bssid);
1709 if (sta)
1710 sta->beacon_loss_count++;
1711 rcu_read_unlock();
1712 }
1713
1714 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1715 __ieee80211_connection_loss(sdata);
1716 else
1717 ieee80211_mgd_probe_ap(sdata, true);
1718 }
1719
ieee80211_beacon_loss(struct ieee80211_vif * vif)1720 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1721 {
1722 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1723 struct ieee80211_hw *hw = &sdata->local->hw;
1724
1725 trace_api_beacon_loss(sdata);
1726
1727 WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1728 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1729 }
1730 EXPORT_SYMBOL(ieee80211_beacon_loss);
1731
ieee80211_connection_loss(struct ieee80211_vif * vif)1732 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1733 {
1734 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1735 struct ieee80211_hw *hw = &sdata->local->hw;
1736
1737 trace_api_connection_loss(sdata);
1738
1739 WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1740 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1741 }
1742 EXPORT_SYMBOL(ieee80211_connection_loss);
1743
1744
ieee80211_destroy_auth_data(struct ieee80211_sub_if_data * sdata,bool assoc)1745 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
1746 bool assoc)
1747 {
1748 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1749
1750 lockdep_assert_held(&sdata->u.mgd.mtx);
1751
1752 if (!assoc) {
1753 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
1754
1755 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1756 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1757 }
1758
1759 cfg80211_put_bss(auth_data->bss);
1760 kfree(auth_data);
1761 sdata->u.mgd.auth_data = NULL;
1762 }
1763
ieee80211_auth_challenge(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len)1764 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1765 struct ieee80211_mgmt *mgmt, size_t len)
1766 {
1767 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1768 u8 *pos;
1769 struct ieee802_11_elems elems;
1770
1771 pos = mgmt->u.auth.variable;
1772 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1773 if (!elems.challenge)
1774 return;
1775 auth_data->expected_transaction = 4;
1776 ieee80211_send_auth(sdata, 3, auth_data->algorithm,
1777 elems.challenge - 2, elems.challenge_len + 2,
1778 auth_data->bss->bssid, auth_data->bss->bssid,
1779 auth_data->key, auth_data->key_len,
1780 auth_data->key_idx);
1781 }
1782
1783 static enum rx_mgmt_action __must_check
ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len)1784 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1785 struct ieee80211_mgmt *mgmt, size_t len)
1786 {
1787 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1788 u8 bssid[ETH_ALEN];
1789 u16 auth_alg, auth_transaction, status_code;
1790 struct sta_info *sta;
1791
1792 lockdep_assert_held(&ifmgd->mtx);
1793
1794 if (len < 24 + 6)
1795 return RX_MGMT_NONE;
1796
1797 if (!ifmgd->auth_data || ifmgd->auth_data->done)
1798 return RX_MGMT_NONE;
1799
1800 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
1801
1802 if (compare_ether_addr(bssid, mgmt->bssid))
1803 return RX_MGMT_NONE;
1804
1805 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1806 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1807 status_code = le16_to_cpu(mgmt->u.auth.status_code);
1808
1809 if (auth_alg != ifmgd->auth_data->algorithm ||
1810 auth_transaction != ifmgd->auth_data->expected_transaction)
1811 return RX_MGMT_NONE;
1812
1813 if (status_code != WLAN_STATUS_SUCCESS) {
1814 printk(KERN_DEBUG "%s: %pM denied authentication (status %d)\n",
1815 sdata->name, mgmt->sa, status_code);
1816 ieee80211_destroy_auth_data(sdata, false);
1817 return RX_MGMT_CFG80211_RX_AUTH;
1818 }
1819
1820 switch (ifmgd->auth_data->algorithm) {
1821 case WLAN_AUTH_OPEN:
1822 case WLAN_AUTH_LEAP:
1823 case WLAN_AUTH_FT:
1824 break;
1825 case WLAN_AUTH_SHARED_KEY:
1826 if (ifmgd->auth_data->expected_transaction != 4) {
1827 ieee80211_auth_challenge(sdata, mgmt, len);
1828 /* need another frame */
1829 return RX_MGMT_NONE;
1830 }
1831 break;
1832 default:
1833 WARN_ONCE(1, "invalid auth alg %d",
1834 ifmgd->auth_data->algorithm);
1835 return RX_MGMT_NONE;
1836 }
1837
1838 printk(KERN_DEBUG "%s: authenticated\n", sdata->name);
1839 ifmgd->auth_data->done = true;
1840 ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
1841 run_again(ifmgd, ifmgd->auth_data->timeout);
1842
1843 /* move station state to auth */
1844 mutex_lock(&sdata->local->sta_mtx);
1845 sta = sta_info_get(sdata, bssid);
1846 if (!sta) {
1847 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
1848 goto out_err;
1849 }
1850 if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
1851 printk(KERN_DEBUG "%s: failed moving %pM to auth\n",
1852 sdata->name, bssid);
1853 goto out_err;
1854 }
1855 mutex_unlock(&sdata->local->sta_mtx);
1856
1857 return RX_MGMT_CFG80211_RX_AUTH;
1858 out_err:
1859 mutex_unlock(&sdata->local->sta_mtx);
1860 /* ignore frame -- wait for timeout */
1861 return RX_MGMT_NONE;
1862 }
1863
1864
1865 static enum rx_mgmt_action __must_check
ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len)1866 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1867 struct ieee80211_mgmt *mgmt, size_t len)
1868 {
1869 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1870 const u8 *bssid = NULL;
1871 u16 reason_code;
1872
1873 lockdep_assert_held(&ifmgd->mtx);
1874
1875 if (len < 24 + 2)
1876 return RX_MGMT_NONE;
1877
1878 if (!ifmgd->associated ||
1879 compare_ether_addr(mgmt->bssid, ifmgd->associated->bssid))
1880 return RX_MGMT_NONE;
1881
1882 bssid = ifmgd->associated->bssid;
1883
1884 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1885
1886 printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1887 sdata->name, bssid, reason_code);
1888
1889 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1890
1891 mutex_lock(&sdata->local->mtx);
1892 ieee80211_recalc_idle(sdata->local);
1893 mutex_unlock(&sdata->local->mtx);
1894
1895 return RX_MGMT_CFG80211_DEAUTH;
1896 }
1897
1898
1899 static enum rx_mgmt_action __must_check
ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len)1900 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1901 struct ieee80211_mgmt *mgmt, size_t len)
1902 {
1903 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1904 u16 reason_code;
1905
1906 lockdep_assert_held(&ifmgd->mtx);
1907
1908 if (len < 24 + 2)
1909 return RX_MGMT_NONE;
1910
1911 if (!ifmgd->associated ||
1912 compare_ether_addr(mgmt->bssid, ifmgd->associated->bssid))
1913 return RX_MGMT_NONE;
1914
1915 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1916
1917 printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1918 sdata->name, mgmt->sa, reason_code);
1919
1920 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1921
1922 mutex_lock(&sdata->local->mtx);
1923 ieee80211_recalc_idle(sdata->local);
1924 mutex_unlock(&sdata->local->mtx);
1925
1926 return RX_MGMT_CFG80211_DISASSOC;
1927 }
1928
ieee80211_get_rates(struct ieee80211_supported_band * sband,u8 * supp_rates,unsigned int supp_rates_len,u32 * rates,u32 * basic_rates,bool * have_higher_than_11mbit,int * min_rate,int * min_rate_index)1929 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
1930 u8 *supp_rates, unsigned int supp_rates_len,
1931 u32 *rates, u32 *basic_rates,
1932 bool *have_higher_than_11mbit,
1933 int *min_rate, int *min_rate_index)
1934 {
1935 int i, j;
1936
1937 for (i = 0; i < supp_rates_len; i++) {
1938 int rate = (supp_rates[i] & 0x7f) * 5;
1939 bool is_basic = !!(supp_rates[i] & 0x80);
1940
1941 if (rate > 110)
1942 *have_higher_than_11mbit = true;
1943
1944 /*
1945 * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
1946 * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
1947 *
1948 * Note: Even through the membership selector and the basic
1949 * rate flag share the same bit, they are not exactly
1950 * the same.
1951 */
1952 if (!!(supp_rates[i] & 0x80) &&
1953 (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1954 continue;
1955
1956 for (j = 0; j < sband->n_bitrates; j++) {
1957 if (sband->bitrates[j].bitrate == rate) {
1958 *rates |= BIT(j);
1959 if (is_basic)
1960 *basic_rates |= BIT(j);
1961 if (rate < *min_rate) {
1962 *min_rate = rate;
1963 *min_rate_index = j;
1964 }
1965 break;
1966 }
1967 }
1968 }
1969 }
1970
ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data * sdata,bool assoc)1971 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
1972 bool assoc)
1973 {
1974 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
1975
1976 lockdep_assert_held(&sdata->u.mgd.mtx);
1977
1978 if (!assoc) {
1979 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
1980
1981 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1982 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1983 }
1984
1985 kfree(assoc_data);
1986 sdata->u.mgd.assoc_data = NULL;
1987 }
1988
ieee80211_assoc_success(struct ieee80211_sub_if_data * sdata,struct cfg80211_bss * cbss,struct ieee80211_mgmt * mgmt,size_t len)1989 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
1990 struct cfg80211_bss *cbss,
1991 struct ieee80211_mgmt *mgmt, size_t len)
1992 {
1993 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1994 struct ieee80211_local *local = sdata->local;
1995 struct ieee80211_supported_band *sband;
1996 struct sta_info *sta;
1997 u8 *pos;
1998 u16 capab_info, aid;
1999 struct ieee802_11_elems elems;
2000 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2001 u32 changed = 0;
2002 int err;
2003 u16 ap_ht_cap_flags;
2004
2005 /* AssocResp and ReassocResp have identical structure */
2006
2007 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2008 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2009
2010 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2011 printk(KERN_DEBUG
2012 "%s: invalid AID value 0x%x; bits 15:14 not set\n",
2013 sdata->name, aid);
2014 aid &= ~(BIT(15) | BIT(14));
2015
2016 ifmgd->broken_ap = false;
2017
2018 if (aid == 0 || aid > IEEE80211_MAX_AID) {
2019 printk(KERN_DEBUG
2020 "%s: invalid AID value %d (out of range), turn off PS\n",
2021 sdata->name, aid);
2022 aid = 0;
2023 ifmgd->broken_ap = true;
2024 }
2025
2026 pos = mgmt->u.assoc_resp.variable;
2027 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2028
2029 if (!elems.supp_rates) {
2030 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
2031 sdata->name);
2032 return false;
2033 }
2034
2035 ifmgd->aid = aid;
2036
2037 mutex_lock(&sdata->local->sta_mtx);
2038 /*
2039 * station info was already allocated and inserted before
2040 * the association and should be available to us
2041 */
2042 sta = sta_info_get(sdata, cbss->bssid);
2043 if (WARN_ON(!sta)) {
2044 mutex_unlock(&sdata->local->sta_mtx);
2045 return false;
2046 }
2047
2048 sband = local->hw.wiphy->bands[local->oper_channel->band];
2049
2050 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2051 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2052 elems.ht_cap_elem, &sta->sta.ht_cap);
2053
2054 ap_ht_cap_flags = sta->sta.ht_cap.cap;
2055
2056 rate_control_rate_init(sta);
2057
2058 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2059 set_sta_flag(sta, WLAN_STA_MFP);
2060
2061 if (elems.wmm_param)
2062 set_sta_flag(sta, WLAN_STA_WME);
2063
2064 err = sta_info_move_state(sta, IEEE80211_STA_AUTH);
2065 if (!err)
2066 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2067 if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2068 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2069 if (err) {
2070 printk(KERN_DEBUG
2071 "%s: failed to move station %pM to desired state\n",
2072 sdata->name, sta->sta.addr);
2073 WARN_ON(__sta_info_destroy(sta));
2074 mutex_unlock(&sdata->local->sta_mtx);
2075 return false;
2076 }
2077
2078 mutex_unlock(&sdata->local->sta_mtx);
2079
2080 /*
2081 * Always handle WMM once after association regardless
2082 * of the first value the AP uses. Setting -1 here has
2083 * that effect because the AP values is an unsigned
2084 * 4-bit value.
2085 */
2086 ifmgd->wmm_last_param_set = -1;
2087
2088 if (elems.wmm_param)
2089 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2090 elems.wmm_param_len);
2091 else
2092 ieee80211_set_wmm_default(sdata, false);
2093 changed |= BSS_CHANGED_QOS;
2094
2095 if (elems.ht_info_elem && elems.wmm_param &&
2096 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2097 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
2098 cbss->bssid, ap_ht_cap_flags,
2099 false);
2100
2101 /* set AID and assoc capability,
2102 * ieee80211_set_associated() will tell the driver */
2103 bss_conf->aid = aid;
2104 bss_conf->assoc_capability = capab_info;
2105 ieee80211_set_associated(sdata, cbss, changed);
2106
2107 /*
2108 * If we're using 4-addr mode, let the AP know that we're
2109 * doing so, so that it can create the STA VLAN on its side
2110 */
2111 if (ifmgd->use_4addr)
2112 ieee80211_send_4addr_nullfunc(local, sdata);
2113
2114 /*
2115 * Start timer to probe the connection to the AP now.
2116 * Also start the timer that will detect beacon loss.
2117 */
2118 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2119 ieee80211_sta_reset_beacon_monitor(sdata);
2120
2121 return true;
2122 }
2123
2124 static enum rx_mgmt_action __must_check
ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len,struct cfg80211_bss ** bss)2125 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2126 struct ieee80211_mgmt *mgmt, size_t len,
2127 struct cfg80211_bss **bss)
2128 {
2129 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2130 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2131 u16 capab_info, status_code, aid;
2132 struct ieee802_11_elems elems;
2133 u8 *pos;
2134 bool reassoc;
2135
2136 lockdep_assert_held(&ifmgd->mtx);
2137
2138 if (!assoc_data)
2139 return RX_MGMT_NONE;
2140 if (compare_ether_addr(assoc_data->bss->bssid, mgmt->bssid))
2141 return RX_MGMT_NONE;
2142
2143 /*
2144 * AssocResp and ReassocResp have identical structure, so process both
2145 * of them in this function.
2146 */
2147
2148 if (len < 24 + 6)
2149 return RX_MGMT_NONE;
2150
2151 reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2152 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2153 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2154 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2155
2156 printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
2157 "status=%d aid=%d)\n",
2158 sdata->name, reassoc ? "Rea" : "A", mgmt->sa,
2159 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2160
2161 pos = mgmt->u.assoc_resp.variable;
2162 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2163
2164 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2165 elems.timeout_int && elems.timeout_int_len == 5 &&
2166 elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2167 u32 tu, ms;
2168 tu = get_unaligned_le32(elems.timeout_int + 1);
2169 ms = tu * 1024 / 1000;
2170 printk(KERN_DEBUG "%s: %pM rejected association temporarily; "
2171 "comeback duration %u TU (%u ms)\n",
2172 sdata->name, mgmt->sa, tu, ms);
2173 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2174 if (ms > IEEE80211_ASSOC_TIMEOUT)
2175 run_again(ifmgd, assoc_data->timeout);
2176 return RX_MGMT_NONE;
2177 }
2178
2179 *bss = assoc_data->bss;
2180
2181 if (status_code != WLAN_STATUS_SUCCESS) {
2182 printk(KERN_DEBUG "%s: %pM denied association (code=%d)\n",
2183 sdata->name, mgmt->sa, status_code);
2184 ieee80211_destroy_assoc_data(sdata, false);
2185 } else {
2186 if (!ieee80211_assoc_success(sdata, *bss, mgmt, len)) {
2187 /* oops -- internal error -- send timeout for now */
2188 ieee80211_destroy_assoc_data(sdata, false);
2189 cfg80211_put_bss(*bss);
2190 return RX_MGMT_CFG80211_ASSOC_TIMEOUT;
2191 }
2192 printk(KERN_DEBUG "%s: associated\n", sdata->name);
2193
2194 /*
2195 * destroy assoc_data afterwards, as otherwise an idle
2196 * recalc after assoc_data is NULL but before associated
2197 * is set can cause the interface to go idle
2198 */
2199 ieee80211_destroy_assoc_data(sdata, true);
2200 }
2201
2202 return RX_MGMT_CFG80211_RX_ASSOC;
2203 }
ieee80211_rx_bss_info(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len,struct ieee80211_rx_status * rx_status,struct ieee802_11_elems * elems,bool beacon)2204 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2205 struct ieee80211_mgmt *mgmt,
2206 size_t len,
2207 struct ieee80211_rx_status *rx_status,
2208 struct ieee802_11_elems *elems,
2209 bool beacon)
2210 {
2211 struct ieee80211_local *local = sdata->local;
2212 int freq;
2213 struct ieee80211_bss *bss;
2214 struct ieee80211_channel *channel;
2215 bool need_ps = false;
2216
2217 if (sdata->u.mgd.associated &&
2218 compare_ether_addr(mgmt->bssid, sdata->u.mgd.associated->bssid)
2219 == 0) {
2220 bss = (void *)sdata->u.mgd.associated->priv;
2221 /* not previously set so we may need to recalc */
2222 need_ps = !bss->dtim_period;
2223 }
2224
2225 if (elems->ds_params && elems->ds_params_len == 1)
2226 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
2227 rx_status->band);
2228 else
2229 freq = rx_status->freq;
2230
2231 channel = ieee80211_get_channel(local->hw.wiphy, freq);
2232
2233 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2234 return;
2235
2236 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2237 channel, beacon);
2238 if (bss)
2239 ieee80211_rx_bss_put(local, bss);
2240
2241 if (!sdata->u.mgd.associated)
2242 return;
2243
2244 if (need_ps) {
2245 mutex_lock(&local->iflist_mtx);
2246 ieee80211_recalc_ps(local, -1);
2247 mutex_unlock(&local->iflist_mtx);
2248 }
2249
2250 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
2251 (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
2252 ETH_ALEN) == 0)) {
2253 struct ieee80211_channel_sw_ie *sw_elem =
2254 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
2255 ieee80211_sta_process_chanswitch(sdata, sw_elem,
2256 bss, rx_status->mactime);
2257 }
2258 }
2259
2260
ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)2261 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2262 struct sk_buff *skb)
2263 {
2264 struct ieee80211_mgmt *mgmt = (void *)skb->data;
2265 struct ieee80211_if_managed *ifmgd;
2266 struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2267 size_t baselen, len = skb->len;
2268 struct ieee802_11_elems elems;
2269
2270 ifmgd = &sdata->u.mgd;
2271
2272 ASSERT_MGD_MTX(ifmgd);
2273
2274 if (compare_ether_addr(mgmt->da, sdata->vif.addr))
2275 return; /* ignore ProbeResp to foreign address */
2276
2277 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2278 if (baselen > len)
2279 return;
2280
2281 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2282 &elems);
2283
2284 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
2285
2286 if (ifmgd->associated &&
2287 compare_ether_addr(mgmt->bssid, ifmgd->associated->bssid) == 0)
2288 ieee80211_reset_ap_probe(sdata);
2289
2290 if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2291 compare_ether_addr(mgmt->bssid, ifmgd->auth_data->bss->bssid)
2292 == 0) {
2293 /* got probe response, continue with auth */
2294 printk(KERN_DEBUG "%s: direct probe responded\n", sdata->name);
2295 ifmgd->auth_data->tries = 0;
2296 ifmgd->auth_data->timeout = jiffies;
2297 run_again(ifmgd, ifmgd->auth_data->timeout);
2298 }
2299 }
2300
2301 /*
2302 * This is the canonical list of information elements we care about,
2303 * the filter code also gives us all changes to the Microsoft OUI
2304 * (00:50:F2) vendor IE which is used for WMM which we need to track.
2305 *
2306 * We implement beacon filtering in software since that means we can
2307 * avoid processing the frame here and in cfg80211, and userspace
2308 * will not be able to tell whether the hardware supports it or not.
2309 *
2310 * XXX: This list needs to be dynamic -- userspace needs to be able to
2311 * add items it requires. It also needs to be able to tell us to
2312 * look out for other vendor IEs.
2313 */
2314 static const u64 care_about_ies =
2315 (1ULL << WLAN_EID_COUNTRY) |
2316 (1ULL << WLAN_EID_ERP_INFO) |
2317 (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2318 (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2319 (1ULL << WLAN_EID_HT_CAPABILITY) |
2320 (1ULL << WLAN_EID_HT_INFORMATION);
2321
ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len,struct ieee80211_rx_status * rx_status)2322 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2323 struct ieee80211_mgmt *mgmt,
2324 size_t len,
2325 struct ieee80211_rx_status *rx_status)
2326 {
2327 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2328 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2329 size_t baselen;
2330 struct ieee802_11_elems elems;
2331 struct ieee80211_local *local = sdata->local;
2332 u32 changed = 0;
2333 bool erp_valid, directed_tim = false;
2334 u8 erp_value = 0;
2335 u32 ncrc;
2336 u8 *bssid;
2337
2338 lockdep_assert_held(&ifmgd->mtx);
2339
2340 /* Process beacon from the current BSS */
2341 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2342 if (baselen > len)
2343 return;
2344
2345 if (rx_status->freq != local->hw.conf.channel->center_freq)
2346 return;
2347
2348 if (ifmgd->assoc_data && !ifmgd->assoc_data->have_beacon &&
2349 compare_ether_addr(mgmt->bssid, ifmgd->assoc_data->bss->bssid)
2350 == 0) {
2351 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2352 len - baselen, &elems);
2353
2354 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2355 false);
2356 ifmgd->assoc_data->have_beacon = true;
2357 ifmgd->assoc_data->sent_assoc = false;
2358 /* continue assoc process */
2359 ifmgd->assoc_data->timeout = jiffies;
2360 run_again(ifmgd, ifmgd->assoc_data->timeout);
2361 return;
2362 }
2363
2364 if (!ifmgd->associated ||
2365 compare_ether_addr(mgmt->bssid, ifmgd->associated->bssid))
2366 return;
2367 bssid = ifmgd->associated->bssid;
2368
2369 /* Track average RSSI from the Beacon frames of the current AP */
2370 ifmgd->last_beacon_signal = rx_status->signal;
2371 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2372 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2373 ifmgd->ave_beacon_signal = rx_status->signal * 16;
2374 ifmgd->last_cqm_event_signal = 0;
2375 ifmgd->count_beacon_signal = 1;
2376 ifmgd->last_ave_beacon_signal = 0;
2377 } else {
2378 ifmgd->ave_beacon_signal =
2379 (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
2380 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
2381 ifmgd->ave_beacon_signal) / 16;
2382 ifmgd->count_beacon_signal++;
2383 }
2384
2385 if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
2386 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
2387 int sig = ifmgd->ave_beacon_signal;
2388 int last_sig = ifmgd->last_ave_beacon_signal;
2389
2390 /*
2391 * if signal crosses either of the boundaries, invoke callback
2392 * with appropriate parameters
2393 */
2394 if (sig > ifmgd->rssi_max_thold &&
2395 (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
2396 ifmgd->last_ave_beacon_signal = sig;
2397 drv_rssi_callback(local, RSSI_EVENT_HIGH);
2398 } else if (sig < ifmgd->rssi_min_thold &&
2399 (last_sig >= ifmgd->rssi_max_thold ||
2400 last_sig == 0)) {
2401 ifmgd->last_ave_beacon_signal = sig;
2402 drv_rssi_callback(local, RSSI_EVENT_LOW);
2403 }
2404 }
2405
2406 if (bss_conf->cqm_rssi_thold &&
2407 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
2408 !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
2409 int sig = ifmgd->ave_beacon_signal / 16;
2410 int last_event = ifmgd->last_cqm_event_signal;
2411 int thold = bss_conf->cqm_rssi_thold;
2412 int hyst = bss_conf->cqm_rssi_hyst;
2413 if (sig < thold &&
2414 (last_event == 0 || sig < last_event - hyst)) {
2415 ifmgd->last_cqm_event_signal = sig;
2416 ieee80211_cqm_rssi_notify(
2417 &sdata->vif,
2418 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
2419 GFP_KERNEL);
2420 } else if (sig > thold &&
2421 (last_event == 0 || sig > last_event + hyst)) {
2422 ifmgd->last_cqm_event_signal = sig;
2423 ieee80211_cqm_rssi_notify(
2424 &sdata->vif,
2425 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
2426 GFP_KERNEL);
2427 }
2428 }
2429
2430 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
2431 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2432 if (net_ratelimit()) {
2433 printk(KERN_DEBUG "%s: cancelling probereq poll due "
2434 "to a received beacon\n", sdata->name);
2435 }
2436 #endif
2437 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
2438 mutex_lock(&local->iflist_mtx);
2439 ieee80211_recalc_ps(local, -1);
2440 mutex_unlock(&local->iflist_mtx);
2441 }
2442
2443 /*
2444 * Push the beacon loss detection into the future since
2445 * we are processing a beacon from the AP just now.
2446 */
2447 ieee80211_sta_reset_beacon_monitor(sdata);
2448
2449 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
2450 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
2451 len - baselen, &elems,
2452 care_about_ies, ncrc);
2453
2454 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2455 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
2456 ifmgd->aid);
2457
2458 if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) {
2459 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2460 true);
2461
2462 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2463 elems.wmm_param_len);
2464 }
2465
2466 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
2467 if (directed_tim) {
2468 if (local->hw.conf.dynamic_ps_timeout > 0) {
2469 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2470 ieee80211_hw_config(local,
2471 IEEE80211_CONF_CHANGE_PS);
2472 ieee80211_send_nullfunc(local, sdata, 0);
2473 } else {
2474 local->pspolling = true;
2475
2476 /*
2477 * Here is assumed that the driver will be
2478 * able to send ps-poll frame and receive a
2479 * response even though power save mode is
2480 * enabled, but some drivers might require
2481 * to disable power save here. This needs
2482 * to be investigated.
2483 */
2484 ieee80211_send_pspoll(local, sdata);
2485 }
2486 }
2487 }
2488
2489 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
2490 return;
2491 ifmgd->beacon_crc = ncrc;
2492 ifmgd->beacon_crc_valid = true;
2493
2494 if (elems.erp_info && elems.erp_info_len >= 1) {
2495 erp_valid = true;
2496 erp_value = elems.erp_info[0];
2497 } else {
2498 erp_valid = false;
2499 }
2500 changed |= ieee80211_handle_bss_capability(sdata,
2501 le16_to_cpu(mgmt->u.beacon.capab_info),
2502 erp_valid, erp_value);
2503
2504
2505 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
2506 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
2507 struct sta_info *sta;
2508 struct ieee80211_supported_band *sband;
2509 u16 ap_ht_cap_flags;
2510
2511 rcu_read_lock();
2512
2513 sta = sta_info_get(sdata, bssid);
2514 if (WARN_ON(!sta)) {
2515 rcu_read_unlock();
2516 return;
2517 }
2518
2519 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2520
2521 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2522 elems.ht_cap_elem, &sta->sta.ht_cap);
2523
2524 ap_ht_cap_flags = sta->sta.ht_cap.cap;
2525
2526 rcu_read_unlock();
2527
2528 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
2529 bssid, ap_ht_cap_flags, true);
2530 }
2531
2532 /* Note: country IE parsing is done for us by cfg80211 */
2533 if (elems.country_elem) {
2534 /* TODO: IBSS also needs this */
2535 if (elems.pwr_constr_elem)
2536 ieee80211_handle_pwr_constr(sdata,
2537 le16_to_cpu(mgmt->u.probe_resp.capab_info),
2538 elems.pwr_constr_elem,
2539 elems.pwr_constr_elem_len);
2540 }
2541
2542 ieee80211_bss_info_change_notify(sdata, changed);
2543 }
2544
ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)2545 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2546 struct sk_buff *skb)
2547 {
2548 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2549 struct ieee80211_rx_status *rx_status;
2550 struct ieee80211_mgmt *mgmt;
2551 struct cfg80211_bss *bss = NULL;
2552 enum rx_mgmt_action rma = RX_MGMT_NONE;
2553 u16 fc;
2554
2555 rx_status = (struct ieee80211_rx_status *) skb->cb;
2556 mgmt = (struct ieee80211_mgmt *) skb->data;
2557 fc = le16_to_cpu(mgmt->frame_control);
2558
2559 mutex_lock(&ifmgd->mtx);
2560
2561 switch (fc & IEEE80211_FCTL_STYPE) {
2562 case IEEE80211_STYPE_BEACON:
2563 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2564 break;
2565 case IEEE80211_STYPE_PROBE_RESP:
2566 ieee80211_rx_mgmt_probe_resp(sdata, skb);
2567 break;
2568 case IEEE80211_STYPE_AUTH:
2569 rma = ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
2570 break;
2571 case IEEE80211_STYPE_DEAUTH:
2572 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
2573 break;
2574 case IEEE80211_STYPE_DISASSOC:
2575 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
2576 break;
2577 case IEEE80211_STYPE_ASSOC_RESP:
2578 case IEEE80211_STYPE_REASSOC_RESP:
2579 rma = ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, &bss);
2580 break;
2581 case IEEE80211_STYPE_ACTION:
2582 switch (mgmt->u.action.category) {
2583 case WLAN_CATEGORY_SPECTRUM_MGMT:
2584 ieee80211_sta_process_chanswitch(sdata,
2585 &mgmt->u.action.u.chan_switch.sw_elem,
2586 (void *)ifmgd->associated->priv,
2587 rx_status->mactime);
2588 break;
2589 }
2590 }
2591 mutex_unlock(&ifmgd->mtx);
2592
2593 switch (rma) {
2594 case RX_MGMT_NONE:
2595 /* no action */
2596 break;
2597 case RX_MGMT_CFG80211_DEAUTH:
2598 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2599 break;
2600 case RX_MGMT_CFG80211_DISASSOC:
2601 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
2602 break;
2603 case RX_MGMT_CFG80211_RX_AUTH:
2604 cfg80211_send_rx_auth(sdata->dev, (u8 *)mgmt, skb->len);
2605 break;
2606 case RX_MGMT_CFG80211_RX_ASSOC:
2607 cfg80211_send_rx_assoc(sdata->dev, bss, (u8 *)mgmt, skb->len);
2608 break;
2609 case RX_MGMT_CFG80211_ASSOC_TIMEOUT:
2610 cfg80211_send_assoc_timeout(sdata->dev, mgmt->bssid);
2611 break;
2612 default:
2613 WARN(1, "unexpected: %d", rma);
2614 }
2615 }
2616
ieee80211_sta_timer(unsigned long data)2617 static void ieee80211_sta_timer(unsigned long data)
2618 {
2619 struct ieee80211_sub_if_data *sdata =
2620 (struct ieee80211_sub_if_data *) data;
2621 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2622 struct ieee80211_local *local = sdata->local;
2623
2624 if (local->quiescing) {
2625 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2626 return;
2627 }
2628
2629 ieee80211_queue_work(&local->hw, &sdata->work);
2630 }
2631
ieee80211_sta_connection_lost(struct ieee80211_sub_if_data * sdata,u8 * bssid,u8 reason)2632 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2633 u8 *bssid, u8 reason)
2634 {
2635 struct ieee80211_local *local = sdata->local;
2636 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2637 u8 frame_buf[DEAUTH_DISASSOC_LEN];
2638
2639 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
2640 IEEE80211_STA_BEACON_POLL);
2641
2642 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
2643 false, frame_buf);
2644 mutex_unlock(&ifmgd->mtx);
2645
2646 /*
2647 * must be outside lock due to cfg80211,
2648 * but that's not a problem.
2649 */
2650 cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
2651
2652 mutex_lock(&local->mtx);
2653 ieee80211_recalc_idle(local);
2654 mutex_unlock(&local->mtx);
2655
2656 mutex_lock(&ifmgd->mtx);
2657 }
2658
ieee80211_probe_auth(struct ieee80211_sub_if_data * sdata)2659 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
2660 {
2661 struct ieee80211_local *local = sdata->local;
2662 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2663 struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
2664
2665 lockdep_assert_held(&ifmgd->mtx);
2666
2667 if (WARN_ON_ONCE(!auth_data))
2668 return -EINVAL;
2669
2670 auth_data->tries++;
2671
2672 if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
2673 printk(KERN_DEBUG "%s: authentication with %pM timed out\n",
2674 sdata->name, auth_data->bss->bssid);
2675
2676 /*
2677 * Most likely AP is not in the range so remove the
2678 * bss struct for that AP.
2679 */
2680 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
2681
2682 return -ETIMEDOUT;
2683 }
2684
2685 if (auth_data->bss->proberesp_ies) {
2686 printk(KERN_DEBUG "%s: send auth to %pM (try %d/%d)\n",
2687 sdata->name, auth_data->bss->bssid, auth_data->tries,
2688 IEEE80211_AUTH_MAX_TRIES);
2689
2690 auth_data->expected_transaction = 2;
2691 ieee80211_send_auth(sdata, 1, auth_data->algorithm,
2692 auth_data->ie, auth_data->ie_len,
2693 auth_data->bss->bssid,
2694 auth_data->bss->bssid, NULL, 0, 0);
2695 } else {
2696 const u8 *ssidie;
2697
2698 printk(KERN_DEBUG "%s: direct probe to %pM (try %d/%i)\n",
2699 sdata->name, auth_data->bss->bssid, auth_data->tries,
2700 IEEE80211_AUTH_MAX_TRIES);
2701
2702 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
2703 if (!ssidie)
2704 return -EINVAL;
2705 /*
2706 * Direct probe is sent to broadcast address as some APs
2707 * will not answer to direct packet in unassociated state.
2708 */
2709 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
2710 NULL, 0, (u32) -1, true, false);
2711 }
2712
2713 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
2714 run_again(ifmgd, auth_data->timeout);
2715
2716 return 0;
2717 }
2718
ieee80211_do_assoc(struct ieee80211_sub_if_data * sdata)2719 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
2720 {
2721 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2722 struct ieee80211_local *local = sdata->local;
2723
2724 lockdep_assert_held(&sdata->u.mgd.mtx);
2725
2726 assoc_data->tries++;
2727 if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
2728 printk(KERN_DEBUG "%s: association with %pM timed out\n",
2729 sdata->name, assoc_data->bss->bssid);
2730
2731 /*
2732 * Most likely AP is not in the range so remove the
2733 * bss struct for that AP.
2734 */
2735 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
2736
2737 return -ETIMEDOUT;
2738 }
2739
2740 printk(KERN_DEBUG "%s: associate with %pM (try %d/%d)\n",
2741 sdata->name, assoc_data->bss->bssid, assoc_data->tries,
2742 IEEE80211_ASSOC_MAX_TRIES);
2743 ieee80211_send_assoc(sdata);
2744
2745 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
2746 run_again(&sdata->u.mgd, assoc_data->timeout);
2747
2748 return 0;
2749 }
2750
ieee80211_sta_work(struct ieee80211_sub_if_data * sdata)2751 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2752 {
2753 struct ieee80211_local *local = sdata->local;
2754 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2755
2756 mutex_lock(&ifmgd->mtx);
2757
2758 if (ifmgd->auth_data &&
2759 time_after(jiffies, ifmgd->auth_data->timeout)) {
2760 if (ifmgd->auth_data->done) {
2761 /*
2762 * ok ... we waited for assoc but userspace didn't,
2763 * so let's just kill the auth data
2764 */
2765 ieee80211_destroy_auth_data(sdata, false);
2766 } else if (ieee80211_probe_auth(sdata)) {
2767 u8 bssid[ETH_ALEN];
2768
2769 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2770
2771 ieee80211_destroy_auth_data(sdata, false);
2772
2773 mutex_unlock(&ifmgd->mtx);
2774 cfg80211_send_auth_timeout(sdata->dev, bssid);
2775 mutex_lock(&ifmgd->mtx);
2776 }
2777 } else if (ifmgd->auth_data)
2778 run_again(ifmgd, ifmgd->auth_data->timeout);
2779
2780 if (ifmgd->assoc_data &&
2781 time_after(jiffies, ifmgd->assoc_data->timeout)) {
2782 if (!ifmgd->assoc_data->have_beacon ||
2783 ieee80211_do_assoc(sdata)) {
2784 u8 bssid[ETH_ALEN];
2785
2786 memcpy(bssid, ifmgd->assoc_data->bss->bssid, ETH_ALEN);
2787
2788 ieee80211_destroy_assoc_data(sdata, false);
2789
2790 mutex_unlock(&ifmgd->mtx);
2791 cfg80211_send_assoc_timeout(sdata->dev, bssid);
2792 mutex_lock(&ifmgd->mtx);
2793 }
2794 } else if (ifmgd->assoc_data)
2795 run_again(ifmgd, ifmgd->assoc_data->timeout);
2796
2797 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2798 IEEE80211_STA_CONNECTION_POLL) &&
2799 ifmgd->associated) {
2800 u8 bssid[ETH_ALEN];
2801 int max_tries;
2802
2803 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2804
2805 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2806 max_tries = max_nullfunc_tries;
2807 else
2808 max_tries = max_probe_tries;
2809
2810 /* ACK received for nullfunc probing frame */
2811 if (!ifmgd->probe_send_count)
2812 ieee80211_reset_ap_probe(sdata);
2813 else if (ifmgd->nullfunc_failed) {
2814 if (ifmgd->probe_send_count < max_tries) {
2815 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2816 wiphy_debug(local->hw.wiphy,
2817 "%s: No ack for nullfunc frame to"
2818 " AP %pM, try %d/%i\n",
2819 sdata->name, bssid,
2820 ifmgd->probe_send_count, max_tries);
2821 #endif
2822 ieee80211_mgd_probe_ap_send(sdata);
2823 } else {
2824 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2825 wiphy_debug(local->hw.wiphy,
2826 "%s: No ack for nullfunc frame to"
2827 " AP %pM, disconnecting.\n",
2828 sdata->name, bssid);
2829 #endif
2830 ieee80211_sta_connection_lost(sdata, bssid,
2831 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2832 }
2833 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
2834 run_again(ifmgd, ifmgd->probe_timeout);
2835 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2836 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2837 wiphy_debug(local->hw.wiphy,
2838 "%s: Failed to send nullfunc to AP %pM"
2839 " after %dms, disconnecting.\n",
2840 sdata->name,
2841 bssid, probe_wait_ms);
2842 #endif
2843 ieee80211_sta_connection_lost(sdata, bssid,
2844 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2845 } else if (ifmgd->probe_send_count < max_tries) {
2846 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2847 wiphy_debug(local->hw.wiphy,
2848 "%s: No probe response from AP %pM"
2849 " after %dms, try %d/%i\n",
2850 sdata->name,
2851 bssid, probe_wait_ms,
2852 ifmgd->probe_send_count, max_tries);
2853 #endif
2854 ieee80211_mgd_probe_ap_send(sdata);
2855 } else {
2856 /*
2857 * We actually lost the connection ... or did we?
2858 * Let's make sure!
2859 */
2860 wiphy_debug(local->hw.wiphy,
2861 "%s: No probe response from AP %pM"
2862 " after %dms, disconnecting.\n",
2863 sdata->name,
2864 bssid, probe_wait_ms);
2865
2866 ieee80211_sta_connection_lost(sdata, bssid,
2867 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2868 }
2869 }
2870
2871 mutex_unlock(&ifmgd->mtx);
2872
2873 mutex_lock(&local->mtx);
2874 ieee80211_recalc_idle(local);
2875 mutex_unlock(&local->mtx);
2876 }
2877
ieee80211_sta_bcn_mon_timer(unsigned long data)2878 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2879 {
2880 struct ieee80211_sub_if_data *sdata =
2881 (struct ieee80211_sub_if_data *) data;
2882 struct ieee80211_local *local = sdata->local;
2883
2884 if (local->quiescing)
2885 return;
2886
2887 ieee80211_queue_work(&sdata->local->hw,
2888 &sdata->u.mgd.beacon_connection_loss_work);
2889 }
2890
ieee80211_sta_conn_mon_timer(unsigned long data)2891 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2892 {
2893 struct ieee80211_sub_if_data *sdata =
2894 (struct ieee80211_sub_if_data *) data;
2895 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2896 struct ieee80211_local *local = sdata->local;
2897
2898 if (local->quiescing)
2899 return;
2900
2901 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2902 }
2903
ieee80211_sta_monitor_work(struct work_struct * work)2904 static void ieee80211_sta_monitor_work(struct work_struct *work)
2905 {
2906 struct ieee80211_sub_if_data *sdata =
2907 container_of(work, struct ieee80211_sub_if_data,
2908 u.mgd.monitor_work);
2909
2910 ieee80211_mgd_probe_ap(sdata, false);
2911 }
2912
ieee80211_restart_sta_timer(struct ieee80211_sub_if_data * sdata)2913 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2914 {
2915 u32 flags;
2916
2917 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2918 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
2919 IEEE80211_STA_CONNECTION_POLL);
2920
2921 /* let's probe the connection once */
2922 flags = sdata->local->hw.flags;
2923 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
2924 ieee80211_queue_work(&sdata->local->hw,
2925 &sdata->u.mgd.monitor_work);
2926 /* and do all the other regular work too */
2927 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2928 }
2929 }
2930
2931 #ifdef CONFIG_PM
ieee80211_sta_quiesce(struct ieee80211_sub_if_data * sdata)2932 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2933 {
2934 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2935
2936 /*
2937 * we need to use atomic bitops for the running bits
2938 * only because both timers might fire at the same
2939 * time -- the code here is properly synchronised.
2940 */
2941
2942 cancel_work_sync(&ifmgd->request_smps_work);
2943
2944 cancel_work_sync(&ifmgd->monitor_work);
2945 cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2946 if (del_timer_sync(&ifmgd->timer))
2947 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2948
2949 cancel_work_sync(&ifmgd->chswitch_work);
2950 if (del_timer_sync(&ifmgd->chswitch_timer))
2951 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2952
2953 /* these will just be re-established on connection */
2954 del_timer_sync(&ifmgd->conn_mon_timer);
2955 del_timer_sync(&ifmgd->bcn_mon_timer);
2956 }
2957
ieee80211_sta_restart(struct ieee80211_sub_if_data * sdata)2958 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2959 {
2960 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2961
2962 if (!ifmgd->associated)
2963 return;
2964
2965 if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
2966 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
2967 mutex_lock(&ifmgd->mtx);
2968 if (ifmgd->associated) {
2969 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2970 wiphy_debug(sdata->local->hw.wiphy,
2971 "%s: driver requested disconnect after resume.\n",
2972 sdata->name);
2973 #endif
2974 ieee80211_sta_connection_lost(sdata,
2975 ifmgd->associated->bssid,
2976 WLAN_REASON_UNSPECIFIED);
2977 mutex_unlock(&ifmgd->mtx);
2978 return;
2979 }
2980 mutex_unlock(&ifmgd->mtx);
2981 }
2982
2983 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2984 add_timer(&ifmgd->timer);
2985 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2986 add_timer(&ifmgd->chswitch_timer);
2987 ieee80211_sta_reset_beacon_monitor(sdata);
2988 ieee80211_restart_sta_timer(sdata);
2989 }
2990 #endif
2991
2992 /* interface setup */
ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data * sdata)2993 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2994 {
2995 struct ieee80211_if_managed *ifmgd;
2996
2997 ifmgd = &sdata->u.mgd;
2998 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2999 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3000 INIT_WORK(&ifmgd->beacon_connection_loss_work,
3001 ieee80211_beacon_connection_loss_work);
3002 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
3003 setup_timer(&ifmgd->timer, ieee80211_sta_timer,
3004 (unsigned long) sdata);
3005 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
3006 (unsigned long) sdata);
3007 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
3008 (unsigned long) sdata);
3009 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
3010 (unsigned long) sdata);
3011
3012 ifmgd->flags = 0;
3013 ifmgd->powersave = sdata->wdev.ps;
3014 ifmgd->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
3015 ifmgd->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
3016
3017 mutex_init(&ifmgd->mtx);
3018
3019 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
3020 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
3021 else
3022 ifmgd->req_smps = IEEE80211_SMPS_OFF;
3023 }
3024
3025 /* scan finished notification */
ieee80211_mlme_notify_scan_completed(struct ieee80211_local * local)3026 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
3027 {
3028 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
3029
3030 /* Restart STA timers */
3031 rcu_read_lock();
3032 list_for_each_entry_rcu(sdata, &local->interfaces, list)
3033 ieee80211_restart_sta_timer(sdata);
3034 rcu_read_unlock();
3035 }
3036
ieee80211_max_network_latency(struct notifier_block * nb,unsigned long data,void * dummy)3037 int ieee80211_max_network_latency(struct notifier_block *nb,
3038 unsigned long data, void *dummy)
3039 {
3040 s32 latency_usec = (s32) data;
3041 struct ieee80211_local *local =
3042 container_of(nb, struct ieee80211_local,
3043 network_latency_notifier);
3044
3045 mutex_lock(&local->iflist_mtx);
3046 ieee80211_recalc_ps(local, latency_usec);
3047 mutex_unlock(&local->iflist_mtx);
3048
3049 return 0;
3050 }
3051
ieee80211_prep_connection(struct ieee80211_sub_if_data * sdata,struct cfg80211_bss * cbss,bool assoc)3052 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3053 struct cfg80211_bss *cbss, bool assoc)
3054 {
3055 struct ieee80211_local *local = sdata->local;
3056 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3057 struct ieee80211_bss *bss = (void *)cbss->priv;
3058 struct sta_info *sta;
3059 bool have_sta = false;
3060 int err;
3061
3062 if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3063 return -EINVAL;
3064
3065 if (assoc) {
3066 rcu_read_lock();
3067 have_sta = sta_info_get(sdata, cbss->bssid);
3068 rcu_read_unlock();
3069 }
3070
3071 if (!have_sta) {
3072 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3073 if (!sta)
3074 return -ENOMEM;
3075 }
3076
3077 mutex_lock(&local->mtx);
3078 ieee80211_recalc_idle(sdata->local);
3079 mutex_unlock(&local->mtx);
3080
3081 /* switch to the right channel */
3082 local->oper_channel = cbss->channel;
3083 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
3084
3085 if (!have_sta) {
3086 struct ieee80211_supported_band *sband;
3087 u32 rates = 0, basic_rates = 0;
3088 bool have_higher_than_11mbit;
3089 int min_rate = INT_MAX, min_rate_index = -1;
3090
3091 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
3092
3093 ieee80211_get_rates(sband, bss->supp_rates,
3094 bss->supp_rates_len,
3095 &rates, &basic_rates,
3096 &have_higher_than_11mbit,
3097 &min_rate, &min_rate_index);
3098
3099 /*
3100 * This used to be a workaround for basic rates missing
3101 * in the association response frame. Now that we no
3102 * longer use the basic rates from there, it probably
3103 * doesn't happen any more, but keep the workaround so
3104 * in case some *other* APs are buggy in different ways
3105 * we can connect -- with a warning.
3106 */
3107 if (!basic_rates && min_rate_index >= 0) {
3108 printk(KERN_DEBUG
3109 "%s: No basic rates, using min rate instead.\n",
3110 sdata->name);
3111 basic_rates = BIT(min_rate_index);
3112 }
3113
3114 sta->sta.supp_rates[cbss->channel->band] = rates;
3115 sdata->vif.bss_conf.basic_rates = basic_rates;
3116
3117 /* cf. IEEE 802.11 9.2.12 */
3118 if (local->oper_channel->band == IEEE80211_BAND_2GHZ &&
3119 have_higher_than_11mbit)
3120 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
3121 else
3122 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
3123
3124 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
3125
3126 /* tell driver about BSSID and basic rates */
3127 ieee80211_bss_info_change_notify(sdata,
3128 BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES);
3129
3130 if (assoc)
3131 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
3132
3133 err = sta_info_insert(sta);
3134 sta = NULL;
3135 if (err) {
3136 printk(KERN_DEBUG
3137 "%s: failed to insert STA entry for the AP (error %d)\n",
3138 sdata->name, err);
3139 return err;
3140 }
3141 } else
3142 WARN_ON_ONCE(compare_ether_addr(ifmgd->bssid, cbss->bssid));
3143
3144 return 0;
3145 }
3146
3147 /* config hooks */
ieee80211_mgd_auth(struct ieee80211_sub_if_data * sdata,struct cfg80211_auth_request * req)3148 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
3149 struct cfg80211_auth_request *req)
3150 {
3151 struct ieee80211_local *local = sdata->local;
3152 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3153 struct ieee80211_mgd_auth_data *auth_data;
3154 u16 auth_alg;
3155 int err;
3156
3157 /* prepare auth data structure */
3158
3159 switch (req->auth_type) {
3160 case NL80211_AUTHTYPE_OPEN_SYSTEM:
3161 auth_alg = WLAN_AUTH_OPEN;
3162 break;
3163 case NL80211_AUTHTYPE_SHARED_KEY:
3164 if (IS_ERR(local->wep_tx_tfm))
3165 return -EOPNOTSUPP;
3166 auth_alg = WLAN_AUTH_SHARED_KEY;
3167 break;
3168 case NL80211_AUTHTYPE_FT:
3169 auth_alg = WLAN_AUTH_FT;
3170 break;
3171 case NL80211_AUTHTYPE_NETWORK_EAP:
3172 auth_alg = WLAN_AUTH_LEAP;
3173 break;
3174 default:
3175 return -EOPNOTSUPP;
3176 }
3177
3178 auth_data = kzalloc(sizeof(*auth_data) + req->ie_len, GFP_KERNEL);
3179 if (!auth_data)
3180 return -ENOMEM;
3181
3182 auth_data->bss = req->bss;
3183
3184 if (req->ie && req->ie_len) {
3185 memcpy(auth_data->ie, req->ie, req->ie_len);
3186 auth_data->ie_len = req->ie_len;
3187 }
3188
3189 if (req->key && req->key_len) {
3190 auth_data->key_len = req->key_len;
3191 auth_data->key_idx = req->key_idx;
3192 memcpy(auth_data->key, req->key, req->key_len);
3193 }
3194
3195 auth_data->algorithm = auth_alg;
3196
3197 /* try to authenticate/probe */
3198
3199 mutex_lock(&ifmgd->mtx);
3200
3201 if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
3202 ifmgd->assoc_data) {
3203 err = -EBUSY;
3204 goto err_free;
3205 }
3206
3207 if (ifmgd->auth_data)
3208 ieee80211_destroy_auth_data(sdata, false);
3209
3210 /* prep auth_data so we don't go into idle on disassoc */
3211 ifmgd->auth_data = auth_data;
3212
3213 if (ifmgd->associated)
3214 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3215
3216 printk(KERN_DEBUG "%s: authenticate with %pM\n",
3217 sdata->name, req->bss->bssid);
3218
3219 err = ieee80211_prep_connection(sdata, req->bss, false);
3220 if (err)
3221 goto err_clear;
3222
3223 err = ieee80211_probe_auth(sdata);
3224 if (err) {
3225 sta_info_destroy_addr(sdata, req->bss->bssid);
3226 goto err_clear;
3227 }
3228
3229 /* hold our own reference */
3230 cfg80211_ref_bss(auth_data->bss);
3231 err = 0;
3232 goto out_unlock;
3233
3234 err_clear:
3235 memset(ifmgd->bssid, 0, ETH_ALEN);
3236 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
3237 ifmgd->auth_data = NULL;
3238 err_free:
3239 kfree(auth_data);
3240 out_unlock:
3241 mutex_unlock(&ifmgd->mtx);
3242
3243 return err;
3244 }
3245
ieee80211_mgd_assoc(struct ieee80211_sub_if_data * sdata,struct cfg80211_assoc_request * req)3246 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
3247 struct cfg80211_assoc_request *req)
3248 {
3249 struct ieee80211_local *local = sdata->local;
3250 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3251 struct ieee80211_bss *bss = (void *)req->bss->priv;
3252 struct ieee80211_mgd_assoc_data *assoc_data;
3253 struct ieee80211_supported_band *sband;
3254 const u8 *ssidie;
3255 int i, err;
3256
3257 ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
3258 if (!ssidie)
3259 return -EINVAL;
3260
3261 assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
3262 if (!assoc_data)
3263 return -ENOMEM;
3264
3265 mutex_lock(&ifmgd->mtx);
3266
3267 if (ifmgd->associated)
3268 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3269
3270 if (ifmgd->auth_data && !ifmgd->auth_data->done) {
3271 err = -EBUSY;
3272 goto err_free;
3273 }
3274
3275 if (ifmgd->assoc_data) {
3276 err = -EBUSY;
3277 goto err_free;
3278 }
3279
3280 if (ifmgd->auth_data) {
3281 bool match;
3282
3283 /* keep sta info, bssid if matching */
3284 match = compare_ether_addr(ifmgd->bssid, req->bss->bssid) == 0;
3285 ieee80211_destroy_auth_data(sdata, match);
3286 }
3287
3288 /* prepare assoc data */
3289
3290 ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
3291 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
3292
3293 ifmgd->beacon_crc_valid = false;
3294
3295 /*
3296 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
3297 * We still associate in non-HT mode (11a/b/g) if any one of these
3298 * ciphers is configured as pairwise.
3299 * We can set this to true for non-11n hardware, that'll be checked
3300 * separately along with the peer capabilities.
3301 */
3302 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
3303 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
3304 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
3305 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
3306 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3307
3308 if (req->flags & ASSOC_REQ_DISABLE_HT)
3309 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3310
3311 /* Also disable HT if we don't support it or the AP doesn't use WMM */
3312 sband = local->hw.wiphy->bands[req->bss->channel->band];
3313 if (!sband->ht_cap.ht_supported ||
3314 local->hw.queues < 4 || !bss->wmm_used)
3315 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3316
3317 memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
3318 memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
3319 sizeof(ifmgd->ht_capa_mask));
3320
3321 if (req->ie && req->ie_len) {
3322 memcpy(assoc_data->ie, req->ie, req->ie_len);
3323 assoc_data->ie_len = req->ie_len;
3324 }
3325
3326 assoc_data->bss = req->bss;
3327
3328 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
3329 if (ifmgd->powersave)
3330 ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
3331 else
3332 ifmgd->ap_smps = IEEE80211_SMPS_OFF;
3333 } else
3334 ifmgd->ap_smps = ifmgd->req_smps;
3335
3336 assoc_data->capability = req->bss->capability;
3337 assoc_data->wmm = bss->wmm_used && (local->hw.queues >= 4);
3338 assoc_data->supp_rates = bss->supp_rates;
3339 assoc_data->supp_rates_len = bss->supp_rates_len;
3340 assoc_data->ht_information_ie =
3341 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
3342
3343 if (bss->wmm_used && bss->uapsd_supported &&
3344 (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
3345 assoc_data->uapsd = true;
3346 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
3347 } else {
3348 assoc_data->uapsd = false;
3349 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
3350 }
3351
3352 memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
3353 assoc_data->ssid_len = ssidie[1];
3354
3355 if (req->prev_bssid)
3356 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
3357
3358 if (req->use_mfp) {
3359 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
3360 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
3361 } else {
3362 ifmgd->mfp = IEEE80211_MFP_DISABLED;
3363 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
3364 }
3365
3366 if (req->crypto.control_port)
3367 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
3368 else
3369 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
3370
3371 sdata->control_port_protocol = req->crypto.control_port_ethertype;
3372 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
3373
3374 /* kick off associate process */
3375
3376 ifmgd->assoc_data = assoc_data;
3377
3378 err = ieee80211_prep_connection(sdata, req->bss, true);
3379 if (err)
3380 goto err_clear;
3381
3382 if (!bss->dtim_period &&
3383 sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) {
3384 /*
3385 * Wait up to one beacon interval ...
3386 * should this be more if we miss one?
3387 */
3388 printk(KERN_DEBUG "%s: waiting for beacon from %pM\n",
3389 sdata->name, ifmgd->bssid);
3390 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
3391 } else {
3392 assoc_data->have_beacon = true;
3393 assoc_data->sent_assoc = false;
3394 assoc_data->timeout = jiffies;
3395 }
3396 run_again(ifmgd, assoc_data->timeout);
3397
3398 if (bss->corrupt_data) {
3399 char *corrupt_type = "data";
3400 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
3401 if (bss->corrupt_data &
3402 IEEE80211_BSS_CORRUPT_PROBE_RESP)
3403 corrupt_type = "beacon and probe response";
3404 else
3405 corrupt_type = "beacon";
3406 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
3407 corrupt_type = "probe response";
3408 printk(KERN_DEBUG "%s: associating with AP with corrupt %s\n",
3409 sdata->name, corrupt_type);
3410 }
3411
3412 err = 0;
3413 goto out;
3414 err_clear:
3415 memset(ifmgd->bssid, 0, ETH_ALEN);
3416 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
3417 ifmgd->assoc_data = NULL;
3418 err_free:
3419 kfree(assoc_data);
3420 out:
3421 mutex_unlock(&ifmgd->mtx);
3422
3423 return err;
3424 }
3425
ieee80211_mgd_deauth(struct ieee80211_sub_if_data * sdata,struct cfg80211_deauth_request * req)3426 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
3427 struct cfg80211_deauth_request *req)
3428 {
3429 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3430 u8 frame_buf[DEAUTH_DISASSOC_LEN];
3431
3432 mutex_lock(&ifmgd->mtx);
3433
3434 if (ifmgd->auth_data) {
3435 ieee80211_destroy_auth_data(sdata, false);
3436 mutex_unlock(&ifmgd->mtx);
3437 return 0;
3438 }
3439
3440 printk(KERN_DEBUG
3441 "%s: deauthenticating from %pM by local choice (reason=%d)\n",
3442 sdata->name, req->bssid, req->reason_code);
3443
3444 if (ifmgd->associated &&
3445 compare_ether_addr(ifmgd->associated->bssid, req->bssid) == 0)
3446 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3447 req->reason_code, true, frame_buf);
3448 else
3449 ieee80211_send_deauth_disassoc(sdata, req->bssid,
3450 IEEE80211_STYPE_DEAUTH,
3451 req->reason_code, true,
3452 frame_buf);
3453 mutex_unlock(&ifmgd->mtx);
3454
3455 __cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3456
3457 mutex_lock(&sdata->local->mtx);
3458 ieee80211_recalc_idle(sdata->local);
3459 mutex_unlock(&sdata->local->mtx);
3460
3461 return 0;
3462 }
3463
ieee80211_mgd_disassoc(struct ieee80211_sub_if_data * sdata,struct cfg80211_disassoc_request * req)3464 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
3465 struct cfg80211_disassoc_request *req)
3466 {
3467 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3468 u8 bssid[ETH_ALEN];
3469 u8 frame_buf[DEAUTH_DISASSOC_LEN];
3470
3471 mutex_lock(&ifmgd->mtx);
3472
3473 /*
3474 * cfg80211 should catch this ... but it's racy since
3475 * we can receive a disassoc frame, process it, hand it
3476 * to cfg80211 while that's in a locked section already
3477 * trying to tell us that the user wants to disconnect.
3478 */
3479 if (ifmgd->associated != req->bss) {
3480 mutex_unlock(&ifmgd->mtx);
3481 return -ENOLINK;
3482 }
3483
3484 printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
3485 sdata->name, req->bss->bssid, req->reason_code);
3486
3487 memcpy(bssid, req->bss->bssid, ETH_ALEN);
3488 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
3489 req->reason_code, !req->local_state_change,
3490 frame_buf);
3491 mutex_unlock(&ifmgd->mtx);
3492
3493 __cfg80211_send_disassoc(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3494
3495 mutex_lock(&sdata->local->mtx);
3496 ieee80211_recalc_idle(sdata->local);
3497 mutex_unlock(&sdata->local->mtx);
3498
3499 return 0;
3500 }
3501
ieee80211_mgd_stop(struct ieee80211_sub_if_data * sdata)3502 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
3503 {
3504 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3505
3506 mutex_lock(&ifmgd->mtx);
3507 if (ifmgd->assoc_data)
3508 ieee80211_destroy_assoc_data(sdata, false);
3509 if (ifmgd->auth_data)
3510 ieee80211_destroy_auth_data(sdata, false);
3511 del_timer_sync(&ifmgd->timer);
3512 mutex_unlock(&ifmgd->mtx);
3513 }
3514
ieee80211_cqm_rssi_notify(struct ieee80211_vif * vif,enum nl80211_cqm_rssi_threshold_event rssi_event,gfp_t gfp)3515 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
3516 enum nl80211_cqm_rssi_threshold_event rssi_event,
3517 gfp_t gfp)
3518 {
3519 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3520
3521 trace_api_cqm_rssi_notify(sdata, rssi_event);
3522
3523 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
3524 }
3525 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
3526
ieee80211_get_operstate(struct ieee80211_vif * vif)3527 unsigned char ieee80211_get_operstate(struct ieee80211_vif *vif)
3528 {
3529 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3530 return sdata->dev->operstate;
3531 }
3532 EXPORT_SYMBOL(ieee80211_get_operstate);
3533