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8b3e852d6032200d6d4b8674466069547f482bcc
[deliverable/linux.git] / net / mac80211 / mlme.c
1 /*
2 * BSS client mode implementation
3 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4 * Copyright 2004, Instant802 Networks, Inc.
5 * Copyright 2005, Devicescape Software, Inc.
6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14 #include <linux/delay.h>
15 #include <linux/if_ether.h>
16 #include <linux/skbuff.h>
17 #include <linux/if_arp.h>
18 #include <linux/etherdevice.h>
19 #include <linux/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_TIMEOUT_SHORT (HZ / 10)
35 #define IEEE80211_AUTH_MAX_TRIES 3
36 #define IEEE80211_AUTH_WAIT_ASSOC (HZ * 5)
37 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
38 #define IEEE80211_ASSOC_TIMEOUT_SHORT (HZ / 10)
39 #define IEEE80211_ASSOC_MAX_TRIES 3
40
41 static int max_nullfunc_tries = 2;
42 module_param(max_nullfunc_tries, int, 0644);
43 MODULE_PARM_DESC(max_nullfunc_tries,
44 "Maximum nullfunc tx tries before disconnecting (reason 4).");
45
46 static int max_probe_tries = 5;
47 module_param(max_probe_tries, int, 0644);
48 MODULE_PARM_DESC(max_probe_tries,
49 "Maximum probe tries before disconnecting (reason 4).");
50
51 /*
52 * Beacon loss timeout is calculated as N frames times the
53 * advertised beacon interval. This may need to be somewhat
54 * higher than what hardware might detect to account for
55 * delays in the host processing frames. But since we also
56 * probe on beacon miss before declaring the connection lost
57 * default to what we want.
58 */
59 static int beacon_loss_count = 7;
60 module_param(beacon_loss_count, int, 0644);
61 MODULE_PARM_DESC(beacon_loss_count,
62 "Number of beacon intervals before we decide beacon was lost.");
63
64 /*
65 * Time the connection can be idle before we probe
66 * it to see if we can still talk to the AP.
67 */
68 #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ)
69 /*
70 * Time we wait for a probe response after sending
71 * a probe request because of beacon loss or for
72 * checking the connection still works.
73 */
74 static int probe_wait_ms = 500;
75 module_param(probe_wait_ms, int, 0644);
76 MODULE_PARM_DESC(probe_wait_ms,
77 "Maximum time(ms) to wait for probe response"
78 " before disconnecting (reason 4).");
79
80 /*
81 * Weight given to the latest Beacon frame when calculating average signal
82 * strength for Beacon frames received in the current BSS. This must be
83 * between 1 and 15.
84 */
85 #define IEEE80211_SIGNAL_AVE_WEIGHT 3
86
87 /*
88 * How many Beacon frames need to have been used in average signal strength
89 * before starting to indicate signal change events.
90 */
91 #define IEEE80211_SIGNAL_AVE_MIN_COUNT 4
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 /* used when a processed beacon causes a deauth */
119 RX_MGMT_CFG80211_TX_DEAUTH,
120 };
121
122 /* utils */
123 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
124 {
125 lockdep_assert_held(&ifmgd->mtx);
126 }
127
128 /*
129 * We can have multiple work items (and connection probing)
130 * scheduling this timer, but we need to take care to only
131 * reschedule it when it should fire _earlier_ than it was
132 * asked for before, or if it's not pending right now. This
133 * function ensures that. Note that it then is required to
134 * run this function for all timeouts after the first one
135 * has happened -- the work that runs from this timer will
136 * do that.
137 */
138 static void run_again(struct ieee80211_if_managed *ifmgd, unsigned long timeout)
139 {
140 ASSERT_MGD_MTX(ifmgd);
141
142 if (!timer_pending(&ifmgd->timer) ||
143 time_before(timeout, ifmgd->timer.expires))
144 mod_timer(&ifmgd->timer, timeout);
145 }
146
147 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
148 {
149 if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
150 return;
151
152 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
153 return;
154
155 mod_timer(&sdata->u.mgd.bcn_mon_timer,
156 round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
157 }
158
159 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
160 {
161 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
162
163 if (unlikely(!sdata->u.mgd.associated))
164 return;
165
166 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
167 return;
168
169 mod_timer(&sdata->u.mgd.conn_mon_timer,
170 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
171
172 ifmgd->probe_send_count = 0;
173 }
174
175 static int ecw2cw(int ecw)
176 {
177 return (1 << ecw) - 1;
178 }
179
180 static u32 chandef_downgrade(struct cfg80211_chan_def *c)
181 {
182 u32 ret;
183 int tmp;
184
185 switch (c->width) {
186 case NL80211_CHAN_WIDTH_20:
187 c->width = NL80211_CHAN_WIDTH_20_NOHT;
188 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
189 break;
190 case NL80211_CHAN_WIDTH_40:
191 c->width = NL80211_CHAN_WIDTH_20;
192 c->center_freq1 = c->chan->center_freq;
193 ret = IEEE80211_STA_DISABLE_40MHZ |
194 IEEE80211_STA_DISABLE_VHT;
195 break;
196 case NL80211_CHAN_WIDTH_80:
197 tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
198 /* n_P40 */
199 tmp /= 2;
200 /* freq_P40 */
201 c->center_freq1 = c->center_freq1 - 20 + 40 * tmp;
202 c->width = NL80211_CHAN_WIDTH_40;
203 ret = IEEE80211_STA_DISABLE_VHT;
204 break;
205 case NL80211_CHAN_WIDTH_80P80:
206 c->center_freq2 = 0;
207 c->width = NL80211_CHAN_WIDTH_80;
208 ret = IEEE80211_STA_DISABLE_80P80MHZ |
209 IEEE80211_STA_DISABLE_160MHZ;
210 break;
211 case NL80211_CHAN_WIDTH_160:
212 /* n_P20 */
213 tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
214 /* n_P80 */
215 tmp /= 4;
216 c->center_freq1 = c->center_freq1 - 40 + 80 * tmp;
217 c->width = NL80211_CHAN_WIDTH_80;
218 ret = IEEE80211_STA_DISABLE_80P80MHZ |
219 IEEE80211_STA_DISABLE_160MHZ;
220 break;
221 default:
222 case NL80211_CHAN_WIDTH_20_NOHT:
223 WARN_ON_ONCE(1);
224 c->width = NL80211_CHAN_WIDTH_20_NOHT;
225 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
226 break;
227 }
228
229 WARN_ON_ONCE(!cfg80211_chandef_valid(c));
230
231 return ret;
232 }
233
234 static u32
235 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
236 struct ieee80211_supported_band *sband,
237 struct ieee80211_channel *channel,
238 const struct ieee80211_ht_operation *ht_oper,
239 const struct ieee80211_vht_operation *vht_oper,
240 struct cfg80211_chan_def *chandef, bool verbose)
241 {
242 struct cfg80211_chan_def vht_chandef;
243 u32 ht_cfreq, ret;
244
245 chandef->chan = channel;
246 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
247 chandef->center_freq1 = channel->center_freq;
248 chandef->center_freq2 = 0;
249
250 if (!ht_oper || !sband->ht_cap.ht_supported) {
251 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
252 goto out;
253 }
254
255 chandef->width = NL80211_CHAN_WIDTH_20;
256
257 ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
258 channel->band);
259 /* check that channel matches the right operating channel */
260 if (channel->center_freq != ht_cfreq) {
261 /*
262 * It's possible that some APs are confused here;
263 * Netgear WNDR3700 sometimes reports 4 higher than
264 * the actual channel in association responses, but
265 * since we look at probe response/beacon data here
266 * it should be OK.
267 */
268 if (verbose)
269 sdata_info(sdata,
270 "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
271 channel->center_freq, ht_cfreq,
272 ht_oper->primary_chan, channel->band);
273 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
274 goto out;
275 }
276
277 /* check 40 MHz support, if we have it */
278 if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
279 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
280 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
281 chandef->width = NL80211_CHAN_WIDTH_40;
282 chandef->center_freq1 += 10;
283 break;
284 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
285 chandef->width = NL80211_CHAN_WIDTH_40;
286 chandef->center_freq1 -= 10;
287 break;
288 }
289 } else {
290 /* 40 MHz (and 80 MHz) must be supported for VHT */
291 ret = IEEE80211_STA_DISABLE_VHT;
292 goto out;
293 }
294
295 if (!vht_oper || !sband->vht_cap.vht_supported) {
296 ret = IEEE80211_STA_DISABLE_VHT;
297 goto out;
298 }
299
300 vht_chandef.chan = channel;
301 vht_chandef.center_freq1 =
302 ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx,
303 channel->band);
304 vht_chandef.center_freq2 = 0;
305
306 if (vht_oper->center_freq_seg2_idx)
307 vht_chandef.center_freq2 =
308 ieee80211_channel_to_frequency(
309 vht_oper->center_freq_seg2_idx,
310 channel->band);
311
312 switch (vht_oper->chan_width) {
313 case IEEE80211_VHT_CHANWIDTH_USE_HT:
314 vht_chandef.width = chandef->width;
315 break;
316 case IEEE80211_VHT_CHANWIDTH_80MHZ:
317 vht_chandef.width = NL80211_CHAN_WIDTH_80;
318 break;
319 case IEEE80211_VHT_CHANWIDTH_160MHZ:
320 vht_chandef.width = NL80211_CHAN_WIDTH_160;
321 break;
322 case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
323 vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
324 break;
325 default:
326 if (verbose)
327 sdata_info(sdata,
328 "AP VHT operation IE has invalid channel width (%d), disable VHT\n",
329 vht_oper->chan_width);
330 ret = IEEE80211_STA_DISABLE_VHT;
331 goto out;
332 }
333
334 if (!cfg80211_chandef_valid(&vht_chandef)) {
335 if (verbose)
336 sdata_info(sdata,
337 "AP VHT information is invalid, disable VHT\n");
338 ret = IEEE80211_STA_DISABLE_VHT;
339 goto out;
340 }
341
342 if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
343 ret = 0;
344 goto out;
345 }
346
347 if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
348 if (verbose)
349 sdata_info(sdata,
350 "AP VHT information doesn't match HT, disable VHT\n");
351 ret = IEEE80211_STA_DISABLE_VHT;
352 goto out;
353 }
354
355 *chandef = vht_chandef;
356
357 ret = 0;
358
359 out:
360 /* don't print the message below for VHT mismatch if VHT is disabled */
361 if (ret & IEEE80211_STA_DISABLE_VHT)
362 vht_chandef = *chandef;
363
364 while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
365 IEEE80211_CHAN_DISABLED)) {
366 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
367 ret = IEEE80211_STA_DISABLE_HT |
368 IEEE80211_STA_DISABLE_VHT;
369 goto out;
370 }
371
372 ret |= chandef_downgrade(chandef);
373 }
374
375 if (chandef->width != vht_chandef.width && verbose)
376 sdata_info(sdata,
377 "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
378
379 WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
380 return ret;
381 }
382
383 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
384 struct sta_info *sta,
385 const struct ieee80211_ht_operation *ht_oper,
386 const struct ieee80211_vht_operation *vht_oper,
387 const u8 *bssid, u32 *changed)
388 {
389 struct ieee80211_local *local = sdata->local;
390 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
391 struct ieee80211_supported_band *sband;
392 struct ieee80211_channel *chan;
393 struct cfg80211_chan_def chandef;
394 u16 ht_opmode;
395 u32 flags;
396 enum ieee80211_sta_rx_bandwidth new_sta_bw;
397 int ret;
398
399 /* if HT was/is disabled, don't track any bandwidth changes */
400 if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
401 return 0;
402
403 /* don't check VHT if we associated as non-VHT station */
404 if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
405 vht_oper = NULL;
406
407 if (WARN_ON_ONCE(!sta))
408 return -EINVAL;
409
410 chan = sdata->vif.bss_conf.chandef.chan;
411 sband = local->hw.wiphy->bands[chan->band];
412
413 /* calculate new channel (type) based on HT/VHT operation IEs */
414 flags = ieee80211_determine_chantype(sdata, sband, chan, ht_oper,
415 vht_oper, &chandef, false);
416
417 /*
418 * Downgrade the new channel if we associated with restricted
419 * capabilities. For example, if we associated as a 20 MHz STA
420 * to a 40 MHz AP (due to regulatory, capabilities or config
421 * reasons) then switching to a 40 MHz channel now won't do us
422 * any good -- we couldn't use it with the AP.
423 */
424 if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
425 chandef.width == NL80211_CHAN_WIDTH_80P80)
426 flags |= chandef_downgrade(&chandef);
427 if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
428 chandef.width == NL80211_CHAN_WIDTH_160)
429 flags |= chandef_downgrade(&chandef);
430 if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
431 chandef.width > NL80211_CHAN_WIDTH_20)
432 flags |= chandef_downgrade(&chandef);
433
434 if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
435 return 0;
436
437 sdata_info(sdata,
438 "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
439 ifmgd->bssid, chandef.chan->center_freq, chandef.width,
440 chandef.center_freq1, chandef.center_freq2);
441
442 if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
443 IEEE80211_STA_DISABLE_VHT |
444 IEEE80211_STA_DISABLE_40MHZ |
445 IEEE80211_STA_DISABLE_80P80MHZ |
446 IEEE80211_STA_DISABLE_160MHZ)) ||
447 !cfg80211_chandef_valid(&chandef)) {
448 sdata_info(sdata,
449 "AP %pM changed bandwidth in a way we can't support - disconnect\n",
450 ifmgd->bssid);
451 return -EINVAL;
452 }
453
454 switch (chandef.width) {
455 case NL80211_CHAN_WIDTH_20_NOHT:
456 case NL80211_CHAN_WIDTH_20:
457 new_sta_bw = IEEE80211_STA_RX_BW_20;
458 break;
459 case NL80211_CHAN_WIDTH_40:
460 new_sta_bw = IEEE80211_STA_RX_BW_40;
461 break;
462 case NL80211_CHAN_WIDTH_80:
463 new_sta_bw = IEEE80211_STA_RX_BW_80;
464 break;
465 case NL80211_CHAN_WIDTH_80P80:
466 case NL80211_CHAN_WIDTH_160:
467 new_sta_bw = IEEE80211_STA_RX_BW_160;
468 break;
469 default:
470 return -EINVAL;
471 }
472
473 if (new_sta_bw > sta->cur_max_bandwidth)
474 new_sta_bw = sta->cur_max_bandwidth;
475
476 if (new_sta_bw < sta->sta.bandwidth) {
477 sta->sta.bandwidth = new_sta_bw;
478 rate_control_rate_update(local, sband, sta,
479 IEEE80211_RC_BW_CHANGED);
480 }
481
482 ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
483 if (ret) {
484 sdata_info(sdata,
485 "AP %pM changed bandwidth to incompatible one - disconnect\n",
486 ifmgd->bssid);
487 return ret;
488 }
489
490 if (new_sta_bw > sta->sta.bandwidth) {
491 sta->sta.bandwidth = new_sta_bw;
492 rate_control_rate_update(local, sband, sta,
493 IEEE80211_RC_BW_CHANGED);
494 }
495
496 ht_opmode = le16_to_cpu(ht_oper->operation_mode);
497
498 /* if bss configuration changed store the new one */
499 if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
500 *changed |= BSS_CHANGED_HT;
501 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
502 }
503
504 return 0;
505 }
506
507 /* frame sending functions */
508
509 static int ieee80211_compatible_rates(const u8 *supp_rates, int supp_rates_len,
510 struct ieee80211_supported_band *sband,
511 u32 *rates)
512 {
513 int i, j, count;
514 *rates = 0;
515 count = 0;
516 for (i = 0; i < supp_rates_len; i++) {
517 int rate = (supp_rates[i] & 0x7F) * 5;
518
519 for (j = 0; j < sband->n_bitrates; j++)
520 if (sband->bitrates[j].bitrate == rate) {
521 *rates |= BIT(j);
522 count++;
523 break;
524 }
525 }
526
527 return count;
528 }
529
530 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
531 struct sk_buff *skb, u8 ap_ht_param,
532 struct ieee80211_supported_band *sband,
533 struct ieee80211_channel *channel,
534 enum ieee80211_smps_mode smps)
535 {
536 u8 *pos;
537 u32 flags = channel->flags;
538 u16 cap;
539 struct ieee80211_sta_ht_cap ht_cap;
540
541 BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
542
543 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
544 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
545
546 /* determine capability flags */
547 cap = ht_cap.cap;
548
549 switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
550 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
551 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
552 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
553 cap &= ~IEEE80211_HT_CAP_SGI_40;
554 }
555 break;
556 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
557 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
558 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
559 cap &= ~IEEE80211_HT_CAP_SGI_40;
560 }
561 break;
562 }
563
564 /*
565 * If 40 MHz was disabled associate as though we weren't
566 * capable of 40 MHz -- some broken APs will never fall
567 * back to trying to transmit in 20 MHz.
568 */
569 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
570 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
571 cap &= ~IEEE80211_HT_CAP_SGI_40;
572 }
573
574 /* set SM PS mode properly */
575 cap &= ~IEEE80211_HT_CAP_SM_PS;
576 switch (smps) {
577 case IEEE80211_SMPS_AUTOMATIC:
578 case IEEE80211_SMPS_NUM_MODES:
579 WARN_ON(1);
580 case IEEE80211_SMPS_OFF:
581 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
582 IEEE80211_HT_CAP_SM_PS_SHIFT;
583 break;
584 case IEEE80211_SMPS_STATIC:
585 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
586 IEEE80211_HT_CAP_SM_PS_SHIFT;
587 break;
588 case IEEE80211_SMPS_DYNAMIC:
589 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
590 IEEE80211_HT_CAP_SM_PS_SHIFT;
591 break;
592 }
593
594 /* reserve and fill IE */
595 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
596 ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
597 }
598
599 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
600 struct sk_buff *skb,
601 struct ieee80211_supported_band *sband,
602 struct ieee80211_vht_cap *ap_vht_cap)
603 {
604 u8 *pos;
605 u32 cap;
606 struct ieee80211_sta_vht_cap vht_cap;
607 int i;
608
609 BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
610
611 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
612 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
613
614 /* determine capability flags */
615 cap = vht_cap.cap;
616
617 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
618 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ;
619 cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
620 }
621
622 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
623 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
624 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
625 }
626
627 /*
628 * Some APs apparently get confused if our capabilities are better
629 * than theirs, so restrict what we advertise in the assoc request.
630 */
631 if (!(ap_vht_cap->vht_cap_info &
632 cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
633 cap &= ~IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE;
634
635 if (!(ap_vht_cap->vht_cap_info &
636 cpu_to_le32(IEEE80211_VHT_CAP_TXSTBC)))
637 cap &= ~(IEEE80211_VHT_CAP_RXSTBC_1 |
638 IEEE80211_VHT_CAP_RXSTBC_3 |
639 IEEE80211_VHT_CAP_RXSTBC_4);
640
641 for (i = 0; i < 8; i++) {
642 int shift = i * 2;
643 u16 mask = IEEE80211_VHT_MCS_NOT_SUPPORTED << shift;
644 u16 ap_mcs, our_mcs;
645
646 ap_mcs = (le16_to_cpu(ap_vht_cap->supp_mcs.tx_mcs_map) &
647 mask) >> shift;
648 our_mcs = (le16_to_cpu(vht_cap.vht_mcs.rx_mcs_map) &
649 mask) >> shift;
650
651 if (our_mcs == IEEE80211_VHT_MCS_NOT_SUPPORTED)
652 continue;
653
654 switch (ap_mcs) {
655 default:
656 if (our_mcs <= ap_mcs)
657 break;
658 /* fall through */
659 case IEEE80211_VHT_MCS_NOT_SUPPORTED:
660 vht_cap.vht_mcs.rx_mcs_map &= cpu_to_le16(~mask);
661 vht_cap.vht_mcs.rx_mcs_map |=
662 cpu_to_le16(ap_mcs << shift);
663 }
664 }
665
666 /* reserve and fill IE */
667 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
668 ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
669 }
670
671 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
672 {
673 struct ieee80211_local *local = sdata->local;
674 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
675 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
676 struct sk_buff *skb;
677 struct ieee80211_mgmt *mgmt;
678 u8 *pos, qos_info;
679 size_t offset = 0, noffset;
680 int i, count, rates_len, supp_rates_len;
681 u16 capab;
682 struct ieee80211_supported_band *sband;
683 struct ieee80211_chanctx_conf *chanctx_conf;
684 struct ieee80211_channel *chan;
685 u32 rates = 0;
686
687 lockdep_assert_held(&ifmgd->mtx);
688
689 rcu_read_lock();
690 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
691 if (WARN_ON(!chanctx_conf)) {
692 rcu_read_unlock();
693 return;
694 }
695 chan = chanctx_conf->def.chan;
696 rcu_read_unlock();
697 sband = local->hw.wiphy->bands[chan->band];
698
699 if (assoc_data->supp_rates_len) {
700 /*
701 * Get all rates supported by the device and the AP as
702 * some APs don't like getting a superset of their rates
703 * in the association request (e.g. D-Link DAP 1353 in
704 * b-only mode)...
705 */
706 rates_len = ieee80211_compatible_rates(assoc_data->supp_rates,
707 assoc_data->supp_rates_len,
708 sband, &rates);
709 } else {
710 /*
711 * In case AP not provide any supported rates information
712 * before association, we send information element(s) with
713 * all rates that we support.
714 */
715 rates = ~0;
716 rates_len = sband->n_bitrates;
717 }
718
719 skb = alloc_skb(local->hw.extra_tx_headroom +
720 sizeof(*mgmt) + /* bit too much but doesn't matter */
721 2 + assoc_data->ssid_len + /* SSID */
722 4 + rates_len + /* (extended) rates */
723 4 + /* power capability */
724 2 + 2 * sband->n_channels + /* supported channels */
725 2 + sizeof(struct ieee80211_ht_cap) + /* HT */
726 2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
727 assoc_data->ie_len + /* extra IEs */
728 9, /* WMM */
729 GFP_KERNEL);
730 if (!skb)
731 return;
732
733 skb_reserve(skb, local->hw.extra_tx_headroom);
734
735 capab = WLAN_CAPABILITY_ESS;
736
737 if (sband->band == IEEE80211_BAND_2GHZ) {
738 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
739 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
740 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
741 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
742 }
743
744 if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
745 capab |= WLAN_CAPABILITY_PRIVACY;
746
747 if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
748 (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
749 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
750
751 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
752 memset(mgmt, 0, 24);
753 memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
754 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
755 memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
756
757 if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
758 skb_put(skb, 10);
759 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
760 IEEE80211_STYPE_REASSOC_REQ);
761 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
762 mgmt->u.reassoc_req.listen_interval =
763 cpu_to_le16(local->hw.conf.listen_interval);
764 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
765 ETH_ALEN);
766 } else {
767 skb_put(skb, 4);
768 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
769 IEEE80211_STYPE_ASSOC_REQ);
770 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
771 mgmt->u.assoc_req.listen_interval =
772 cpu_to_le16(local->hw.conf.listen_interval);
773 }
774
775 /* SSID */
776 pos = skb_put(skb, 2 + assoc_data->ssid_len);
777 *pos++ = WLAN_EID_SSID;
778 *pos++ = assoc_data->ssid_len;
779 memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
780
781 /* add all rates which were marked to be used above */
782 supp_rates_len = rates_len;
783 if (supp_rates_len > 8)
784 supp_rates_len = 8;
785
786 pos = skb_put(skb, supp_rates_len + 2);
787 *pos++ = WLAN_EID_SUPP_RATES;
788 *pos++ = supp_rates_len;
789
790 count = 0;
791 for (i = 0; i < sband->n_bitrates; i++) {
792 if (BIT(i) & rates) {
793 int rate = sband->bitrates[i].bitrate;
794 *pos++ = (u8) (rate / 5);
795 if (++count == 8)
796 break;
797 }
798 }
799
800 if (rates_len > count) {
801 pos = skb_put(skb, rates_len - count + 2);
802 *pos++ = WLAN_EID_EXT_SUPP_RATES;
803 *pos++ = rates_len - count;
804
805 for (i++; i < sband->n_bitrates; i++) {
806 if (BIT(i) & rates) {
807 int rate = sband->bitrates[i].bitrate;
808 *pos++ = (u8) (rate / 5);
809 }
810 }
811 }
812
813 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
814 /* 1. power capabilities */
815 pos = skb_put(skb, 4);
816 *pos++ = WLAN_EID_PWR_CAPABILITY;
817 *pos++ = 2;
818 *pos++ = 0; /* min tx power */
819 *pos++ = chan->max_power; /* max tx power */
820
821 /* 2. supported channels */
822 /* TODO: get this in reg domain format */
823 pos = skb_put(skb, 2 * sband->n_channels + 2);
824 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
825 *pos++ = 2 * sband->n_channels;
826 for (i = 0; i < sband->n_channels; i++) {
827 *pos++ = ieee80211_frequency_to_channel(
828 sband->channels[i].center_freq);
829 *pos++ = 1; /* one channel in the subband*/
830 }
831 }
832
833 /* if present, add any custom IEs that go before HT */
834 if (assoc_data->ie_len && assoc_data->ie) {
835 static const u8 before_ht[] = {
836 WLAN_EID_SSID,
837 WLAN_EID_SUPP_RATES,
838 WLAN_EID_EXT_SUPP_RATES,
839 WLAN_EID_PWR_CAPABILITY,
840 WLAN_EID_SUPPORTED_CHANNELS,
841 WLAN_EID_RSN,
842 WLAN_EID_QOS_CAPA,
843 WLAN_EID_RRM_ENABLED_CAPABILITIES,
844 WLAN_EID_MOBILITY_DOMAIN,
845 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
846 };
847 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
848 before_ht, ARRAY_SIZE(before_ht),
849 offset);
850 pos = skb_put(skb, noffset - offset);
851 memcpy(pos, assoc_data->ie + offset, noffset - offset);
852 offset = noffset;
853 }
854
855 if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
856 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
857 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
858
859 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
860 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
861 sband, chan, sdata->smps_mode);
862
863 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
864 ieee80211_add_vht_ie(sdata, skb, sband,
865 &assoc_data->ap_vht_cap);
866
867 /* if present, add any custom non-vendor IEs that go after HT */
868 if (assoc_data->ie_len && assoc_data->ie) {
869 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
870 assoc_data->ie_len,
871 offset);
872 pos = skb_put(skb, noffset - offset);
873 memcpy(pos, assoc_data->ie + offset, noffset - offset);
874 offset = noffset;
875 }
876
877 if (assoc_data->wmm) {
878 if (assoc_data->uapsd) {
879 qos_info = ifmgd->uapsd_queues;
880 qos_info |= (ifmgd->uapsd_max_sp_len <<
881 IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
882 } else {
883 qos_info = 0;
884 }
885
886 pos = skb_put(skb, 9);
887 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
888 *pos++ = 7; /* len */
889 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
890 *pos++ = 0x50;
891 *pos++ = 0xf2;
892 *pos++ = 2; /* WME */
893 *pos++ = 0; /* WME info */
894 *pos++ = 1; /* WME ver */
895 *pos++ = qos_info;
896 }
897
898 /* add any remaining custom (i.e. vendor specific here) IEs */
899 if (assoc_data->ie_len && assoc_data->ie) {
900 noffset = assoc_data->ie_len;
901 pos = skb_put(skb, noffset - offset);
902 memcpy(pos, assoc_data->ie + offset, noffset - offset);
903 }
904
905 drv_mgd_prepare_tx(local, sdata);
906
907 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
908 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
909 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
910 IEEE80211_TX_INTFL_MLME_CONN_TX;
911 ieee80211_tx_skb(sdata, skb);
912 }
913
914 void ieee80211_send_pspoll(struct ieee80211_local *local,
915 struct ieee80211_sub_if_data *sdata)
916 {
917 struct ieee80211_pspoll *pspoll;
918 struct sk_buff *skb;
919
920 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
921 if (!skb)
922 return;
923
924 pspoll = (struct ieee80211_pspoll *) skb->data;
925 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
926
927 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
928 ieee80211_tx_skb(sdata, skb);
929 }
930
931 void ieee80211_send_nullfunc(struct ieee80211_local *local,
932 struct ieee80211_sub_if_data *sdata,
933 int powersave)
934 {
935 struct sk_buff *skb;
936 struct ieee80211_hdr_3addr *nullfunc;
937 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
938
939 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
940 if (!skb)
941 return;
942
943 nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
944 if (powersave)
945 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
946
947 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
948 IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
949 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
950 IEEE80211_STA_CONNECTION_POLL))
951 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
952
953 ieee80211_tx_skb(sdata, skb);
954 }
955
956 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
957 struct ieee80211_sub_if_data *sdata)
958 {
959 struct sk_buff *skb;
960 struct ieee80211_hdr *nullfunc;
961 __le16 fc;
962
963 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
964 return;
965
966 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
967 if (!skb)
968 return;
969
970 skb_reserve(skb, local->hw.extra_tx_headroom);
971
972 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
973 memset(nullfunc, 0, 30);
974 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
975 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
976 nullfunc->frame_control = fc;
977 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
978 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
979 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
980 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
981
982 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
983 ieee80211_tx_skb(sdata, skb);
984 }
985
986 /* spectrum management related things */
987 static void ieee80211_chswitch_work(struct work_struct *work)
988 {
989 struct ieee80211_sub_if_data *sdata =
990 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
991 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
992
993 if (!ieee80211_sdata_running(sdata))
994 return;
995
996 mutex_lock(&ifmgd->mtx);
997 if (!ifmgd->associated)
998 goto out;
999
1000 sdata->local->_oper_channel = sdata->local->csa_channel;
1001 if (!sdata->local->ops->channel_switch) {
1002 /* call "hw_config" only if doing sw channel switch */
1003 ieee80211_hw_config(sdata->local,
1004 IEEE80211_CONF_CHANGE_CHANNEL);
1005 } else {
1006 /* update the device channel directly */
1007 sdata->local->hw.conf.channel = sdata->local->_oper_channel;
1008 }
1009
1010 /* XXX: shouldn't really modify cfg80211-owned data! */
1011 ifmgd->associated->channel = sdata->local->_oper_channel;
1012
1013 /* XXX: wait for a beacon first? */
1014 ieee80211_wake_queues_by_reason(&sdata->local->hw,
1015 IEEE80211_MAX_QUEUE_MAP,
1016 IEEE80211_QUEUE_STOP_REASON_CSA);
1017 out:
1018 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
1019 mutex_unlock(&ifmgd->mtx);
1020 }
1021
1022 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
1023 {
1024 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1025 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1026
1027 trace_api_chswitch_done(sdata, success);
1028 if (!success) {
1029 sdata_info(sdata,
1030 "driver channel switch failed, disconnecting\n");
1031 ieee80211_queue_work(&sdata->local->hw,
1032 &ifmgd->csa_connection_drop_work);
1033 } else {
1034 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1035 }
1036 }
1037 EXPORT_SYMBOL(ieee80211_chswitch_done);
1038
1039 static void ieee80211_chswitch_timer(unsigned long data)
1040 {
1041 struct ieee80211_sub_if_data *sdata =
1042 (struct ieee80211_sub_if_data *) data;
1043
1044 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1045 }
1046
1047 void
1048 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1049 const struct ieee80211_channel_sw_ie *sw_elem,
1050 struct ieee80211_bss *bss, u64 timestamp)
1051 {
1052 struct cfg80211_bss *cbss =
1053 container_of((void *)bss, struct cfg80211_bss, priv);
1054 struct ieee80211_channel *new_ch;
1055 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1056 int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
1057 cbss->channel->band);
1058 struct ieee80211_chanctx *chanctx;
1059
1060 ASSERT_MGD_MTX(ifmgd);
1061
1062 if (!ifmgd->associated)
1063 return;
1064
1065 if (sdata->local->scanning)
1066 return;
1067
1068 /* Disregard subsequent beacons if we are already running a timer
1069 processing a CSA */
1070
1071 if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
1072 return;
1073
1074 new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
1075 if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED) {
1076 sdata_info(sdata,
1077 "AP %pM switches to unsupported channel (%d MHz), disconnecting\n",
1078 ifmgd->associated->bssid, new_freq);
1079 ieee80211_queue_work(&sdata->local->hw,
1080 &ifmgd->csa_connection_drop_work);
1081 return;
1082 }
1083
1084 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
1085
1086 if (sdata->local->use_chanctx) {
1087 sdata_info(sdata,
1088 "not handling channel switch with channel contexts\n");
1089 ieee80211_queue_work(&sdata->local->hw,
1090 &ifmgd->csa_connection_drop_work);
1091 return;
1092 }
1093
1094 mutex_lock(&sdata->local->chanctx_mtx);
1095 if (WARN_ON(!rcu_access_pointer(sdata->vif.chanctx_conf))) {
1096 mutex_unlock(&sdata->local->chanctx_mtx);
1097 return;
1098 }
1099 chanctx = container_of(rcu_access_pointer(sdata->vif.chanctx_conf),
1100 struct ieee80211_chanctx, conf);
1101 if (chanctx->refcount > 1) {
1102 sdata_info(sdata,
1103 "channel switch with multiple interfaces on the same channel, disconnecting\n");
1104 ieee80211_queue_work(&sdata->local->hw,
1105 &ifmgd->csa_connection_drop_work);
1106 mutex_unlock(&sdata->local->chanctx_mtx);
1107 return;
1108 }
1109 mutex_unlock(&sdata->local->chanctx_mtx);
1110
1111 sdata->local->csa_channel = new_ch;
1112
1113 if (sw_elem->mode)
1114 ieee80211_stop_queues_by_reason(&sdata->local->hw,
1115 IEEE80211_MAX_QUEUE_MAP,
1116 IEEE80211_QUEUE_STOP_REASON_CSA);
1117
1118 if (sdata->local->ops->channel_switch) {
1119 /* use driver's channel switch callback */
1120 struct ieee80211_channel_switch ch_switch = {
1121 .timestamp = timestamp,
1122 .block_tx = sw_elem->mode,
1123 .channel = new_ch,
1124 .count = sw_elem->count,
1125 };
1126
1127 drv_channel_switch(sdata->local, &ch_switch);
1128 return;
1129 }
1130
1131 /* channel switch handled in software */
1132 if (sw_elem->count <= 1)
1133 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1134 else
1135 mod_timer(&ifmgd->chswitch_timer,
1136 TU_TO_EXP_TIME(sw_elem->count *
1137 cbss->beacon_interval));
1138 }
1139
1140 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1141 struct ieee80211_channel *channel,
1142 const u8 *country_ie, u8 country_ie_len,
1143 const u8 *pwr_constr_elem)
1144 {
1145 struct ieee80211_country_ie_triplet *triplet;
1146 int chan = ieee80211_frequency_to_channel(channel->center_freq);
1147 int i, chan_pwr, chan_increment, new_ap_level;
1148 bool have_chan_pwr = false;
1149
1150 /* Invalid IE */
1151 if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1152 return 0;
1153
1154 triplet = (void *)(country_ie + 3);
1155 country_ie_len -= 3;
1156
1157 switch (channel->band) {
1158 default:
1159 WARN_ON_ONCE(1);
1160 /* fall through */
1161 case IEEE80211_BAND_2GHZ:
1162 case IEEE80211_BAND_60GHZ:
1163 chan_increment = 1;
1164 break;
1165 case IEEE80211_BAND_5GHZ:
1166 chan_increment = 4;
1167 break;
1168 }
1169
1170 /* find channel */
1171 while (country_ie_len >= 3) {
1172 u8 first_channel = triplet->chans.first_channel;
1173
1174 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1175 goto next;
1176
1177 for (i = 0; i < triplet->chans.num_channels; i++) {
1178 if (first_channel + i * chan_increment == chan) {
1179 have_chan_pwr = true;
1180 chan_pwr = triplet->chans.max_power;
1181 break;
1182 }
1183 }
1184 if (have_chan_pwr)
1185 break;
1186
1187 next:
1188 triplet++;
1189 country_ie_len -= 3;
1190 }
1191
1192 if (!have_chan_pwr)
1193 return 0;
1194
1195 new_ap_level = max_t(int, 0, chan_pwr - *pwr_constr_elem);
1196
1197 if (sdata->ap_power_level == new_ap_level)
1198 return 0;
1199
1200 sdata_info(sdata,
1201 "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1202 new_ap_level, chan_pwr, *pwr_constr_elem,
1203 sdata->u.mgd.bssid);
1204 sdata->ap_power_level = new_ap_level;
1205 if (__ieee80211_recalc_txpower(sdata))
1206 return BSS_CHANGED_TXPOWER;
1207 return 0;
1208 }
1209
1210 /* powersave */
1211 static void ieee80211_enable_ps(struct ieee80211_local *local,
1212 struct ieee80211_sub_if_data *sdata)
1213 {
1214 struct ieee80211_conf *conf = &local->hw.conf;
1215
1216 /*
1217 * If we are scanning right now then the parameters will
1218 * take effect when scan finishes.
1219 */
1220 if (local->scanning)
1221 return;
1222
1223 if (conf->dynamic_ps_timeout > 0 &&
1224 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
1225 mod_timer(&local->dynamic_ps_timer, jiffies +
1226 msecs_to_jiffies(conf->dynamic_ps_timeout));
1227 } else {
1228 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1229 ieee80211_send_nullfunc(local, sdata, 1);
1230
1231 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1232 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
1233 return;
1234
1235 conf->flags |= IEEE80211_CONF_PS;
1236 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1237 }
1238 }
1239
1240 static void ieee80211_change_ps(struct ieee80211_local *local)
1241 {
1242 struct ieee80211_conf *conf = &local->hw.conf;
1243
1244 if (local->ps_sdata) {
1245 ieee80211_enable_ps(local, local->ps_sdata);
1246 } else if (conf->flags & IEEE80211_CONF_PS) {
1247 conf->flags &= ~IEEE80211_CONF_PS;
1248 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1249 del_timer_sync(&local->dynamic_ps_timer);
1250 cancel_work_sync(&local->dynamic_ps_enable_work);
1251 }
1252 }
1253
1254 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1255 {
1256 struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1257 struct sta_info *sta = NULL;
1258 bool authorized = false;
1259
1260 if (!mgd->powersave)
1261 return false;
1262
1263 if (mgd->broken_ap)
1264 return false;
1265
1266 if (!mgd->associated)
1267 return false;
1268
1269 if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
1270 IEEE80211_STA_CONNECTION_POLL))
1271 return false;
1272
1273 rcu_read_lock();
1274 sta = sta_info_get(sdata, mgd->bssid);
1275 if (sta)
1276 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1277 rcu_read_unlock();
1278
1279 return authorized;
1280 }
1281
1282 /* need to hold RTNL or interface lock */
1283 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1284 {
1285 struct ieee80211_sub_if_data *sdata, *found = NULL;
1286 int count = 0;
1287 int timeout;
1288
1289 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
1290 local->ps_sdata = NULL;
1291 return;
1292 }
1293
1294 list_for_each_entry(sdata, &local->interfaces, list) {
1295 if (!ieee80211_sdata_running(sdata))
1296 continue;
1297 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1298 /* If an AP vif is found, then disable PS
1299 * by setting the count to zero thereby setting
1300 * ps_sdata to NULL.
1301 */
1302 count = 0;
1303 break;
1304 }
1305 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1306 continue;
1307 found = sdata;
1308 count++;
1309 }
1310
1311 if (count == 1 && ieee80211_powersave_allowed(found)) {
1312 s32 beaconint_us;
1313
1314 if (latency < 0)
1315 latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1316
1317 beaconint_us = ieee80211_tu_to_usec(
1318 found->vif.bss_conf.beacon_int);
1319
1320 timeout = local->dynamic_ps_forced_timeout;
1321 if (timeout < 0) {
1322 /*
1323 * Go to full PSM if the user configures a very low
1324 * latency requirement.
1325 * The 2000 second value is there for compatibility
1326 * until the PM_QOS_NETWORK_LATENCY is configured
1327 * with real values.
1328 */
1329 if (latency > (1900 * USEC_PER_MSEC) &&
1330 latency != (2000 * USEC_PER_SEC))
1331 timeout = 0;
1332 else
1333 timeout = 100;
1334 }
1335 local->hw.conf.dynamic_ps_timeout = timeout;
1336
1337 if (beaconint_us > latency) {
1338 local->ps_sdata = NULL;
1339 } else {
1340 int maxslp = 1;
1341 u8 dtimper = found->u.mgd.dtim_period;
1342
1343 /* If the TIM IE is invalid, pretend the value is 1 */
1344 if (!dtimper)
1345 dtimper = 1;
1346 else if (dtimper > 1)
1347 maxslp = min_t(int, dtimper,
1348 latency / beaconint_us);
1349
1350 local->hw.conf.max_sleep_period = maxslp;
1351 local->hw.conf.ps_dtim_period = dtimper;
1352 local->ps_sdata = found;
1353 }
1354 } else {
1355 local->ps_sdata = NULL;
1356 }
1357
1358 ieee80211_change_ps(local);
1359 }
1360
1361 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1362 {
1363 bool ps_allowed = ieee80211_powersave_allowed(sdata);
1364
1365 if (sdata->vif.bss_conf.ps != ps_allowed) {
1366 sdata->vif.bss_conf.ps = ps_allowed;
1367 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1368 }
1369 }
1370
1371 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1372 {
1373 struct ieee80211_local *local =
1374 container_of(work, struct ieee80211_local,
1375 dynamic_ps_disable_work);
1376
1377 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1378 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1379 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1380 }
1381
1382 ieee80211_wake_queues_by_reason(&local->hw,
1383 IEEE80211_MAX_QUEUE_MAP,
1384 IEEE80211_QUEUE_STOP_REASON_PS);
1385 }
1386
1387 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1388 {
1389 struct ieee80211_local *local =
1390 container_of(work, struct ieee80211_local,
1391 dynamic_ps_enable_work);
1392 struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1393 struct ieee80211_if_managed *ifmgd;
1394 unsigned long flags;
1395 int q;
1396
1397 /* can only happen when PS was just disabled anyway */
1398 if (!sdata)
1399 return;
1400
1401 ifmgd = &sdata->u.mgd;
1402
1403 if (local->hw.conf.flags & IEEE80211_CONF_PS)
1404 return;
1405
1406 if (local->hw.conf.dynamic_ps_timeout > 0) {
1407 /* don't enter PS if TX frames are pending */
1408 if (drv_tx_frames_pending(local)) {
1409 mod_timer(&local->dynamic_ps_timer, jiffies +
1410 msecs_to_jiffies(
1411 local->hw.conf.dynamic_ps_timeout));
1412 return;
1413 }
1414
1415 /*
1416 * transmission can be stopped by others which leads to
1417 * dynamic_ps_timer expiry. Postpone the ps timer if it
1418 * is not the actual idle state.
1419 */
1420 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1421 for (q = 0; q < local->hw.queues; q++) {
1422 if (local->queue_stop_reasons[q]) {
1423 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1424 flags);
1425 mod_timer(&local->dynamic_ps_timer, jiffies +
1426 msecs_to_jiffies(
1427 local->hw.conf.dynamic_ps_timeout));
1428 return;
1429 }
1430 }
1431 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1432 }
1433
1434 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1435 !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1436 netif_tx_stop_all_queues(sdata->dev);
1437
1438 if (drv_tx_frames_pending(local))
1439 mod_timer(&local->dynamic_ps_timer, jiffies +
1440 msecs_to_jiffies(
1441 local->hw.conf.dynamic_ps_timeout));
1442 else {
1443 ieee80211_send_nullfunc(local, sdata, 1);
1444 /* Flush to get the tx status of nullfunc frame */
1445 ieee80211_flush_queues(local, sdata);
1446 }
1447 }
1448
1449 if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1450 (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1451 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1452 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1453 local->hw.conf.flags |= IEEE80211_CONF_PS;
1454 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1455 }
1456
1457 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1458 netif_tx_wake_all_queues(sdata->dev);
1459 }
1460
1461 void ieee80211_dynamic_ps_timer(unsigned long data)
1462 {
1463 struct ieee80211_local *local = (void *) data;
1464
1465 if (local->quiescing || local->suspended)
1466 return;
1467
1468 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1469 }
1470
1471 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1472 {
1473 struct delayed_work *delayed_work =
1474 container_of(work, struct delayed_work, work);
1475 struct ieee80211_sub_if_data *sdata =
1476 container_of(delayed_work, struct ieee80211_sub_if_data,
1477 dfs_cac_timer_work);
1478
1479 ieee80211_vif_release_channel(sdata);
1480
1481 cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_FINISHED, GFP_KERNEL);
1482 }
1483
1484 /* MLME */
1485 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1486 struct ieee80211_sub_if_data *sdata,
1487 const u8 *wmm_param, size_t wmm_param_len)
1488 {
1489 struct ieee80211_tx_queue_params params;
1490 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1491 size_t left;
1492 int count;
1493 const u8 *pos;
1494 u8 uapsd_queues = 0;
1495
1496 if (!local->ops->conf_tx)
1497 return false;
1498
1499 if (local->hw.queues < IEEE80211_NUM_ACS)
1500 return false;
1501
1502 if (!wmm_param)
1503 return false;
1504
1505 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1506 return false;
1507
1508 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1509 uapsd_queues = ifmgd->uapsd_queues;
1510
1511 count = wmm_param[6] & 0x0f;
1512 if (count == ifmgd->wmm_last_param_set)
1513 return false;
1514 ifmgd->wmm_last_param_set = count;
1515
1516 pos = wmm_param + 8;
1517 left = wmm_param_len - 8;
1518
1519 memset(&params, 0, sizeof(params));
1520
1521 sdata->wmm_acm = 0;
1522 for (; left >= 4; left -= 4, pos += 4) {
1523 int aci = (pos[0] >> 5) & 0x03;
1524 int acm = (pos[0] >> 4) & 0x01;
1525 bool uapsd = false;
1526 int queue;
1527
1528 switch (aci) {
1529 case 1: /* AC_BK */
1530 queue = 3;
1531 if (acm)
1532 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1533 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1534 uapsd = true;
1535 break;
1536 case 2: /* AC_VI */
1537 queue = 1;
1538 if (acm)
1539 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1540 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1541 uapsd = true;
1542 break;
1543 case 3: /* AC_VO */
1544 queue = 0;
1545 if (acm)
1546 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1547 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1548 uapsd = true;
1549 break;
1550 case 0: /* AC_BE */
1551 default:
1552 queue = 2;
1553 if (acm)
1554 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1555 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1556 uapsd = true;
1557 break;
1558 }
1559
1560 params.aifs = pos[0] & 0x0f;
1561 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1562 params.cw_min = ecw2cw(pos[1] & 0x0f);
1563 params.txop = get_unaligned_le16(pos + 2);
1564 params.uapsd = uapsd;
1565
1566 mlme_dbg(sdata,
1567 "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1568 queue, aci, acm,
1569 params.aifs, params.cw_min, params.cw_max,
1570 params.txop, params.uapsd);
1571 sdata->tx_conf[queue] = params;
1572 if (drv_conf_tx(local, sdata, queue, &params))
1573 sdata_err(sdata,
1574 "failed to set TX queue parameters for queue %d\n",
1575 queue);
1576 }
1577
1578 /* enable WMM or activate new settings */
1579 sdata->vif.bss_conf.qos = true;
1580 return true;
1581 }
1582
1583 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1584 {
1585 lockdep_assert_held(&sdata->local->mtx);
1586
1587 sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1588 IEEE80211_STA_BEACON_POLL);
1589 ieee80211_run_deferred_scan(sdata->local);
1590 }
1591
1592 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1593 {
1594 mutex_lock(&sdata->local->mtx);
1595 __ieee80211_stop_poll(sdata);
1596 mutex_unlock(&sdata->local->mtx);
1597 }
1598
1599 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1600 u16 capab, bool erp_valid, u8 erp)
1601 {
1602 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1603 u32 changed = 0;
1604 bool use_protection;
1605 bool use_short_preamble;
1606 bool use_short_slot;
1607
1608 if (erp_valid) {
1609 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1610 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1611 } else {
1612 use_protection = false;
1613 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1614 }
1615
1616 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1617 if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1618 use_short_slot = true;
1619
1620 if (use_protection != bss_conf->use_cts_prot) {
1621 bss_conf->use_cts_prot = use_protection;
1622 changed |= BSS_CHANGED_ERP_CTS_PROT;
1623 }
1624
1625 if (use_short_preamble != bss_conf->use_short_preamble) {
1626 bss_conf->use_short_preamble = use_short_preamble;
1627 changed |= BSS_CHANGED_ERP_PREAMBLE;
1628 }
1629
1630 if (use_short_slot != bss_conf->use_short_slot) {
1631 bss_conf->use_short_slot = use_short_slot;
1632 changed |= BSS_CHANGED_ERP_SLOT;
1633 }
1634
1635 return changed;
1636 }
1637
1638 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1639 struct cfg80211_bss *cbss,
1640 u32 bss_info_changed)
1641 {
1642 struct ieee80211_bss *bss = (void *)cbss->priv;
1643 struct ieee80211_local *local = sdata->local;
1644 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1645
1646 bss_info_changed |= BSS_CHANGED_ASSOC;
1647 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1648 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1649
1650 sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1651 beacon_loss_count * bss_conf->beacon_int));
1652
1653 sdata->u.mgd.associated = cbss;
1654 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1655
1656 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1657
1658 if (sdata->vif.p2p) {
1659 const struct cfg80211_bss_ies *ies;
1660
1661 rcu_read_lock();
1662 ies = rcu_dereference(cbss->ies);
1663 if (ies) {
1664 int ret;
1665
1666 ret = cfg80211_get_p2p_attr(
1667 ies->data, ies->len,
1668 IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1669 (u8 *) &bss_conf->p2p_noa_attr,
1670 sizeof(bss_conf->p2p_noa_attr));
1671 if (ret >= 2) {
1672 sdata->u.mgd.p2p_noa_index =
1673 bss_conf->p2p_noa_attr.index;
1674 bss_info_changed |= BSS_CHANGED_P2P_PS;
1675 }
1676 }
1677 rcu_read_unlock();
1678 }
1679
1680 /* just to be sure */
1681 ieee80211_stop_poll(sdata);
1682
1683 ieee80211_led_assoc(local, 1);
1684
1685 if (sdata->u.mgd.assoc_data->have_beacon) {
1686 /*
1687 * If the AP is buggy we may get here with no DTIM period
1688 * known, so assume it's 1 which is the only safe assumption
1689 * in that case, although if the TIM IE is broken powersave
1690 * probably just won't work at all.
1691 */
1692 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1693 bss_info_changed |= BSS_CHANGED_DTIM_PERIOD;
1694 } else {
1695 bss_conf->dtim_period = 0;
1696 }
1697
1698 bss_conf->assoc = 1;
1699
1700 /* Tell the driver to monitor connection quality (if supported) */
1701 if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1702 bss_conf->cqm_rssi_thold)
1703 bss_info_changed |= BSS_CHANGED_CQM;
1704
1705 /* Enable ARP filtering */
1706 if (bss_conf->arp_addr_cnt)
1707 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1708
1709 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1710
1711 mutex_lock(&local->iflist_mtx);
1712 ieee80211_recalc_ps(local, -1);
1713 mutex_unlock(&local->iflist_mtx);
1714
1715 ieee80211_recalc_smps(sdata);
1716 ieee80211_recalc_ps_vif(sdata);
1717
1718 netif_tx_start_all_queues(sdata->dev);
1719 netif_carrier_on(sdata->dev);
1720 }
1721
1722 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1723 u16 stype, u16 reason, bool tx,
1724 u8 *frame_buf)
1725 {
1726 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1727 struct ieee80211_local *local = sdata->local;
1728 u32 changed = 0;
1729
1730 ASSERT_MGD_MTX(ifmgd);
1731
1732 if (WARN_ON_ONCE(tx && !frame_buf))
1733 return;
1734
1735 if (WARN_ON(!ifmgd->associated))
1736 return;
1737
1738 ieee80211_stop_poll(sdata);
1739
1740 ifmgd->associated = NULL;
1741
1742 /*
1743 * we need to commit the associated = NULL change because the
1744 * scan code uses that to determine whether this iface should
1745 * go to/wake up from powersave or not -- and could otherwise
1746 * wake the queues erroneously.
1747 */
1748 smp_mb();
1749
1750 /*
1751 * Thus, we can only afterwards stop the queues -- to account
1752 * for the case where another CPU is finishing a scan at this
1753 * time -- we don't want the scan code to enable queues.
1754 */
1755
1756 netif_tx_stop_all_queues(sdata->dev);
1757 netif_carrier_off(sdata->dev);
1758
1759 /*
1760 * if we want to get out of ps before disassoc (why?) we have
1761 * to do it before sending disassoc, as otherwise the null-packet
1762 * won't be valid.
1763 */
1764 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1765 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1766 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1767 }
1768 local->ps_sdata = NULL;
1769
1770 /* disable per-vif ps */
1771 ieee80211_recalc_ps_vif(sdata);
1772
1773 /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
1774 if (tx)
1775 ieee80211_flush_queues(local, sdata);
1776
1777 /* deauthenticate/disassociate now */
1778 if (tx || frame_buf)
1779 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
1780 reason, tx, frame_buf);
1781
1782 /* flush out frame */
1783 if (tx)
1784 ieee80211_flush_queues(local, sdata);
1785
1786 /* clear bssid only after building the needed mgmt frames */
1787 memset(ifmgd->bssid, 0, ETH_ALEN);
1788
1789 /* remove AP and TDLS peers */
1790 sta_info_flush_defer(sdata);
1791
1792 /* finally reset all BSS / config parameters */
1793 changed |= ieee80211_reset_erp_info(sdata);
1794
1795 ieee80211_led_assoc(local, 0);
1796 changed |= BSS_CHANGED_ASSOC;
1797 sdata->vif.bss_conf.assoc = false;
1798
1799 ifmgd->p2p_noa_index = -1;
1800 memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
1801 sizeof(sdata->vif.bss_conf.p2p_noa_attr));
1802
1803 /* on the next assoc, re-program HT/VHT parameters */
1804 memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1805 memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1806 memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
1807 memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
1808
1809 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1810
1811 del_timer_sync(&local->dynamic_ps_timer);
1812 cancel_work_sync(&local->dynamic_ps_enable_work);
1813
1814 /* Disable ARP filtering */
1815 if (sdata->vif.bss_conf.arp_addr_cnt)
1816 changed |= BSS_CHANGED_ARP_FILTER;
1817
1818 sdata->vif.bss_conf.qos = false;
1819 changed |= BSS_CHANGED_QOS;
1820
1821 /* The BSSID (not really interesting) and HT changed */
1822 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1823 ieee80211_bss_info_change_notify(sdata, changed);
1824
1825 /* disassociated - set to defaults now */
1826 ieee80211_set_wmm_default(sdata, false);
1827
1828 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1829 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1830 del_timer_sync(&sdata->u.mgd.timer);
1831 del_timer_sync(&sdata->u.mgd.chswitch_timer);
1832
1833 sdata->vif.bss_conf.dtim_period = 0;
1834
1835 ifmgd->flags = 0;
1836 ieee80211_vif_release_channel(sdata);
1837 }
1838
1839 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1840 struct ieee80211_hdr *hdr)
1841 {
1842 /*
1843 * We can postpone the mgd.timer whenever receiving unicast frames
1844 * from AP because we know that the connection is working both ways
1845 * at that time. But multicast frames (and hence also beacons) must
1846 * be ignored here, because we need to trigger the timer during
1847 * data idle periods for sending the periodic probe request to the
1848 * AP we're connected to.
1849 */
1850 if (is_multicast_ether_addr(hdr->addr1))
1851 return;
1852
1853 ieee80211_sta_reset_conn_monitor(sdata);
1854 }
1855
1856 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1857 {
1858 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1859 struct ieee80211_local *local = sdata->local;
1860
1861 mutex_lock(&local->mtx);
1862 if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1863 IEEE80211_STA_CONNECTION_POLL))) {
1864 mutex_unlock(&local->mtx);
1865 return;
1866 }
1867
1868 __ieee80211_stop_poll(sdata);
1869
1870 mutex_lock(&local->iflist_mtx);
1871 ieee80211_recalc_ps(local, -1);
1872 mutex_unlock(&local->iflist_mtx);
1873
1874 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1875 goto out;
1876
1877 /*
1878 * We've received a probe response, but are not sure whether
1879 * we have or will be receiving any beacons or data, so let's
1880 * schedule the timers again, just in case.
1881 */
1882 ieee80211_sta_reset_beacon_monitor(sdata);
1883
1884 mod_timer(&ifmgd->conn_mon_timer,
1885 round_jiffies_up(jiffies +
1886 IEEE80211_CONNECTION_IDLE_TIME));
1887 out:
1888 mutex_unlock(&local->mtx);
1889 }
1890
1891 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1892 struct ieee80211_hdr *hdr, bool ack)
1893 {
1894 if (!ieee80211_is_data(hdr->frame_control))
1895 return;
1896
1897 if (ieee80211_is_nullfunc(hdr->frame_control) &&
1898 sdata->u.mgd.probe_send_count > 0) {
1899 if (ack)
1900 ieee80211_sta_reset_conn_monitor(sdata);
1901 else
1902 sdata->u.mgd.nullfunc_failed = true;
1903 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1904 return;
1905 }
1906
1907 if (ack)
1908 ieee80211_sta_reset_conn_monitor(sdata);
1909 }
1910
1911 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1912 {
1913 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1914 const u8 *ssid;
1915 u8 *dst = ifmgd->associated->bssid;
1916 u8 unicast_limit = max(1, max_probe_tries - 3);
1917
1918 /*
1919 * Try sending broadcast probe requests for the last three
1920 * probe requests after the first ones failed since some
1921 * buggy APs only support broadcast probe requests.
1922 */
1923 if (ifmgd->probe_send_count >= unicast_limit)
1924 dst = NULL;
1925
1926 /*
1927 * When the hardware reports an accurate Tx ACK status, it's
1928 * better to send a nullfunc frame instead of a probe request,
1929 * as it will kick us off the AP quickly if we aren't associated
1930 * anymore. The timeout will be reset if the frame is ACKed by
1931 * the AP.
1932 */
1933 ifmgd->probe_send_count++;
1934
1935 if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1936 ifmgd->nullfunc_failed = false;
1937 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1938 } else {
1939 int ssid_len;
1940
1941 rcu_read_lock();
1942 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1943 if (WARN_ON_ONCE(ssid == NULL))
1944 ssid_len = 0;
1945 else
1946 ssid_len = ssid[1];
1947
1948 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
1949 0, (u32) -1, true, 0,
1950 ifmgd->associated->channel, false);
1951 rcu_read_unlock();
1952 }
1953
1954 ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1955 run_again(ifmgd, ifmgd->probe_timeout);
1956 if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
1957 ieee80211_flush_queues(sdata->local, sdata);
1958 }
1959
1960 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1961 bool beacon)
1962 {
1963 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1964 bool already = false;
1965
1966 if (!ieee80211_sdata_running(sdata))
1967 return;
1968
1969 mutex_lock(&ifmgd->mtx);
1970
1971 if (!ifmgd->associated)
1972 goto out;
1973
1974 mutex_lock(&sdata->local->mtx);
1975
1976 if (sdata->local->tmp_channel || sdata->local->scanning) {
1977 mutex_unlock(&sdata->local->mtx);
1978 goto out;
1979 }
1980
1981 if (beacon)
1982 mlme_dbg_ratelimited(sdata,
1983 "detected beacon loss from AP (missed %d beacons) - probing\n",
1984 beacon_loss_count);
1985
1986 ieee80211_cqm_rssi_notify(&sdata->vif,
1987 NL80211_CQM_RSSI_BEACON_LOSS_EVENT, GFP_KERNEL);
1988
1989 /*
1990 * The driver/our work has already reported this event or the
1991 * connection monitoring has kicked in and we have already sent
1992 * a probe request. Or maybe the AP died and the driver keeps
1993 * reporting until we disassociate...
1994 *
1995 * In either case we have to ignore the current call to this
1996 * function (except for setting the correct probe reason bit)
1997 * because otherwise we would reset the timer every time and
1998 * never check whether we received a probe response!
1999 */
2000 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2001 IEEE80211_STA_CONNECTION_POLL))
2002 already = true;
2003
2004 if (beacon)
2005 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
2006 else
2007 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2008
2009 mutex_unlock(&sdata->local->mtx);
2010
2011 if (already)
2012 goto out;
2013
2014 mutex_lock(&sdata->local->iflist_mtx);
2015 ieee80211_recalc_ps(sdata->local, -1);
2016 mutex_unlock(&sdata->local->iflist_mtx);
2017
2018 ifmgd->probe_send_count = 0;
2019 ieee80211_mgd_probe_ap_send(sdata);
2020 out:
2021 mutex_unlock(&ifmgd->mtx);
2022 }
2023
2024 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2025 struct ieee80211_vif *vif)
2026 {
2027 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2028 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2029 struct cfg80211_bss *cbss;
2030 struct sk_buff *skb;
2031 const u8 *ssid;
2032 int ssid_len;
2033
2034 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2035 return NULL;
2036
2037 ASSERT_MGD_MTX(ifmgd);
2038
2039 if (ifmgd->associated)
2040 cbss = ifmgd->associated;
2041 else if (ifmgd->auth_data)
2042 cbss = ifmgd->auth_data->bss;
2043 else if (ifmgd->assoc_data)
2044 cbss = ifmgd->assoc_data->bss;
2045 else
2046 return NULL;
2047
2048 rcu_read_lock();
2049 ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2050 if (WARN_ON_ONCE(ssid == NULL))
2051 ssid_len = 0;
2052 else
2053 ssid_len = ssid[1];
2054
2055 skb = ieee80211_build_probe_req(sdata, cbss->bssid,
2056 (u32) -1, cbss->channel,
2057 ssid + 2, ssid_len,
2058 NULL, 0, true);
2059 rcu_read_unlock();
2060
2061 return skb;
2062 }
2063 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2064
2065 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2066 {
2067 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2068 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2069
2070 mutex_lock(&ifmgd->mtx);
2071 if (!ifmgd->associated) {
2072 mutex_unlock(&ifmgd->mtx);
2073 return;
2074 }
2075
2076 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2077 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2078 true, frame_buf);
2079 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
2080 ieee80211_wake_queues_by_reason(&sdata->local->hw,
2081 IEEE80211_MAX_QUEUE_MAP,
2082 IEEE80211_QUEUE_STOP_REASON_CSA);
2083 mutex_unlock(&ifmgd->mtx);
2084
2085 /*
2086 * must be outside lock due to cfg80211,
2087 * but that's not a problem.
2088 */
2089 cfg80211_send_deauth(sdata->dev, frame_buf, IEEE80211_DEAUTH_FRAME_LEN);
2090 }
2091
2092 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2093 {
2094 struct ieee80211_sub_if_data *sdata =
2095 container_of(work, struct ieee80211_sub_if_data,
2096 u.mgd.beacon_connection_loss_work);
2097 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2098 struct sta_info *sta;
2099
2100 if (ifmgd->associated) {
2101 rcu_read_lock();
2102 sta = sta_info_get(sdata, ifmgd->bssid);
2103 if (sta)
2104 sta->beacon_loss_count++;
2105 rcu_read_unlock();
2106 }
2107
2108 if (ifmgd->connection_loss) {
2109 sdata_info(sdata, "Connection to AP %pM lost\n",
2110 ifmgd->bssid);
2111 __ieee80211_disconnect(sdata);
2112 } else {
2113 ieee80211_mgd_probe_ap(sdata, true);
2114 }
2115 }
2116
2117 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2118 {
2119 struct ieee80211_sub_if_data *sdata =
2120 container_of(work, struct ieee80211_sub_if_data,
2121 u.mgd.csa_connection_drop_work);
2122
2123 __ieee80211_disconnect(sdata);
2124 }
2125
2126 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2127 {
2128 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2129 struct ieee80211_hw *hw = &sdata->local->hw;
2130
2131 trace_api_beacon_loss(sdata);
2132
2133 WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
2134 sdata->u.mgd.connection_loss = false;
2135 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2136 }
2137 EXPORT_SYMBOL(ieee80211_beacon_loss);
2138
2139 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2140 {
2141 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2142 struct ieee80211_hw *hw = &sdata->local->hw;
2143
2144 trace_api_connection_loss(sdata);
2145
2146 sdata->u.mgd.connection_loss = true;
2147 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2148 }
2149 EXPORT_SYMBOL(ieee80211_connection_loss);
2150
2151
2152 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2153 bool assoc)
2154 {
2155 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2156
2157 lockdep_assert_held(&sdata->u.mgd.mtx);
2158
2159 if (!assoc) {
2160 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2161
2162 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2163 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2164 sdata->u.mgd.flags = 0;
2165 ieee80211_vif_release_channel(sdata);
2166 }
2167
2168 cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2169 kfree(auth_data);
2170 sdata->u.mgd.auth_data = NULL;
2171 }
2172
2173 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2174 struct ieee80211_mgmt *mgmt, size_t len)
2175 {
2176 struct ieee80211_local *local = sdata->local;
2177 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2178 u8 *pos;
2179 struct ieee802_11_elems elems;
2180 u32 tx_flags = 0;
2181
2182 pos = mgmt->u.auth.variable;
2183 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2184 if (!elems.challenge)
2185 return;
2186 auth_data->expected_transaction = 4;
2187 drv_mgd_prepare_tx(sdata->local, sdata);
2188 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2189 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2190 IEEE80211_TX_INTFL_MLME_CONN_TX;
2191 ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2192 elems.challenge - 2, elems.challenge_len + 2,
2193 auth_data->bss->bssid, auth_data->bss->bssid,
2194 auth_data->key, auth_data->key_len,
2195 auth_data->key_idx, tx_flags);
2196 }
2197
2198 static enum rx_mgmt_action __must_check
2199 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2200 struct ieee80211_mgmt *mgmt, size_t len)
2201 {
2202 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2203 u8 bssid[ETH_ALEN];
2204 u16 auth_alg, auth_transaction, status_code;
2205 struct sta_info *sta;
2206
2207 lockdep_assert_held(&ifmgd->mtx);
2208
2209 if (len < 24 + 6)
2210 return RX_MGMT_NONE;
2211
2212 if (!ifmgd->auth_data || ifmgd->auth_data->done)
2213 return RX_MGMT_NONE;
2214
2215 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2216
2217 if (!ether_addr_equal(bssid, mgmt->bssid))
2218 return RX_MGMT_NONE;
2219
2220 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2221 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2222 status_code = le16_to_cpu(mgmt->u.auth.status_code);
2223
2224 if (auth_alg != ifmgd->auth_data->algorithm ||
2225 auth_transaction != ifmgd->auth_data->expected_transaction) {
2226 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2227 mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2228 auth_transaction,
2229 ifmgd->auth_data->expected_transaction);
2230 return RX_MGMT_NONE;
2231 }
2232
2233 if (status_code != WLAN_STATUS_SUCCESS) {
2234 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2235 mgmt->sa, status_code);
2236 ieee80211_destroy_auth_data(sdata, false);
2237 return RX_MGMT_CFG80211_RX_AUTH;
2238 }
2239
2240 switch (ifmgd->auth_data->algorithm) {
2241 case WLAN_AUTH_OPEN:
2242 case WLAN_AUTH_LEAP:
2243 case WLAN_AUTH_FT:
2244 case WLAN_AUTH_SAE:
2245 break;
2246 case WLAN_AUTH_SHARED_KEY:
2247 if (ifmgd->auth_data->expected_transaction != 4) {
2248 ieee80211_auth_challenge(sdata, mgmt, len);
2249 /* need another frame */
2250 return RX_MGMT_NONE;
2251 }
2252 break;
2253 default:
2254 WARN_ONCE(1, "invalid auth alg %d",
2255 ifmgd->auth_data->algorithm);
2256 return RX_MGMT_NONE;
2257 }
2258
2259 sdata_info(sdata, "authenticated\n");
2260 ifmgd->auth_data->done = true;
2261 ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2262 ifmgd->auth_data->timeout_started = true;
2263 run_again(ifmgd, ifmgd->auth_data->timeout);
2264
2265 if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2266 ifmgd->auth_data->expected_transaction != 2) {
2267 /*
2268 * Report auth frame to user space for processing since another
2269 * round of Authentication frames is still needed.
2270 */
2271 return RX_MGMT_CFG80211_RX_AUTH;
2272 }
2273
2274 /* move station state to auth */
2275 mutex_lock(&sdata->local->sta_mtx);
2276 sta = sta_info_get(sdata, bssid);
2277 if (!sta) {
2278 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2279 goto out_err;
2280 }
2281 if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2282 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2283 goto out_err;
2284 }
2285 mutex_unlock(&sdata->local->sta_mtx);
2286
2287 return RX_MGMT_CFG80211_RX_AUTH;
2288 out_err:
2289 mutex_unlock(&sdata->local->sta_mtx);
2290 /* ignore frame -- wait for timeout */
2291 return RX_MGMT_NONE;
2292 }
2293
2294
2295 static enum rx_mgmt_action __must_check
2296 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2297 struct ieee80211_mgmt *mgmt, size_t len)
2298 {
2299 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2300 const u8 *bssid = NULL;
2301 u16 reason_code;
2302
2303 lockdep_assert_held(&ifmgd->mtx);
2304
2305 if (len < 24 + 2)
2306 return RX_MGMT_NONE;
2307
2308 if (!ifmgd->associated ||
2309 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2310 return RX_MGMT_NONE;
2311
2312 bssid = ifmgd->associated->bssid;
2313
2314 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2315
2316 sdata_info(sdata, "deauthenticated from %pM (Reason: %u)\n",
2317 bssid, reason_code);
2318
2319 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2320
2321 return RX_MGMT_CFG80211_DEAUTH;
2322 }
2323
2324
2325 static enum rx_mgmt_action __must_check
2326 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2327 struct ieee80211_mgmt *mgmt, size_t len)
2328 {
2329 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2330 u16 reason_code;
2331
2332 lockdep_assert_held(&ifmgd->mtx);
2333
2334 if (len < 24 + 2)
2335 return RX_MGMT_NONE;
2336
2337 if (!ifmgd->associated ||
2338 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2339 return RX_MGMT_NONE;
2340
2341 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2342
2343 sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2344 mgmt->sa, reason_code);
2345
2346 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2347
2348 return RX_MGMT_CFG80211_DISASSOC;
2349 }
2350
2351 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2352 u8 *supp_rates, unsigned int supp_rates_len,
2353 u32 *rates, u32 *basic_rates,
2354 bool *have_higher_than_11mbit,
2355 int *min_rate, int *min_rate_index)
2356 {
2357 int i, j;
2358
2359 for (i = 0; i < supp_rates_len; i++) {
2360 int rate = (supp_rates[i] & 0x7f) * 5;
2361 bool is_basic = !!(supp_rates[i] & 0x80);
2362
2363 if (rate > 110)
2364 *have_higher_than_11mbit = true;
2365
2366 /*
2367 * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2368 * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2369 *
2370 * Note: Even through the membership selector and the basic
2371 * rate flag share the same bit, they are not exactly
2372 * the same.
2373 */
2374 if (!!(supp_rates[i] & 0x80) &&
2375 (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2376 continue;
2377
2378 for (j = 0; j < sband->n_bitrates; j++) {
2379 if (sband->bitrates[j].bitrate == rate) {
2380 *rates |= BIT(j);
2381 if (is_basic)
2382 *basic_rates |= BIT(j);
2383 if (rate < *min_rate) {
2384 *min_rate = rate;
2385 *min_rate_index = j;
2386 }
2387 break;
2388 }
2389 }
2390 }
2391 }
2392
2393 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2394 bool assoc)
2395 {
2396 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2397
2398 lockdep_assert_held(&sdata->u.mgd.mtx);
2399
2400 if (!assoc) {
2401 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2402
2403 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2404 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2405 sdata->u.mgd.flags = 0;
2406 ieee80211_vif_release_channel(sdata);
2407 }
2408
2409 kfree(assoc_data);
2410 sdata->u.mgd.assoc_data = NULL;
2411 }
2412
2413 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2414 struct cfg80211_bss *cbss,
2415 struct ieee80211_mgmt *mgmt, size_t len)
2416 {
2417 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2418 struct ieee80211_local *local = sdata->local;
2419 struct ieee80211_supported_band *sband;
2420 struct sta_info *sta;
2421 u8 *pos;
2422 u16 capab_info, aid;
2423 struct ieee802_11_elems elems;
2424 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2425 u32 changed = 0;
2426 int err;
2427
2428 /* AssocResp and ReassocResp have identical structure */
2429
2430 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2431 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2432
2433 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2434 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2435 aid);
2436 aid &= ~(BIT(15) | BIT(14));
2437
2438 ifmgd->broken_ap = false;
2439
2440 if (aid == 0 || aid > IEEE80211_MAX_AID) {
2441 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2442 aid);
2443 aid = 0;
2444 ifmgd->broken_ap = true;
2445 }
2446
2447 pos = mgmt->u.assoc_resp.variable;
2448 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2449
2450 if (!elems.supp_rates) {
2451 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2452 return false;
2453 }
2454
2455 ifmgd->aid = aid;
2456
2457 /*
2458 * We previously checked these in the beacon/probe response, so
2459 * they should be present here. This is just a safety net.
2460 */
2461 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2462 (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2463 sdata_info(sdata,
2464 "HT AP is missing WMM params or HT capability/operation in AssocResp\n");
2465 return false;
2466 }
2467
2468 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2469 (!elems.vht_cap_elem || !elems.vht_operation)) {
2470 sdata_info(sdata,
2471 "VHT AP is missing VHT capability/operation in AssocResp\n");
2472 return false;
2473 }
2474
2475 mutex_lock(&sdata->local->sta_mtx);
2476 /*
2477 * station info was already allocated and inserted before
2478 * the association and should be available to us
2479 */
2480 sta = sta_info_get(sdata, cbss->bssid);
2481 if (WARN_ON(!sta)) {
2482 mutex_unlock(&sdata->local->sta_mtx);
2483 return false;
2484 }
2485
2486 sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2487
2488 /* Set up internal HT/VHT capabilities */
2489 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2490 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2491 elems.ht_cap_elem, sta);
2492
2493 if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
2494 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2495 elems.vht_cap_elem, sta);
2496
2497 /*
2498 * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
2499 * in their association response, so ignore that data for our own
2500 * configuration. If it changed since the last beacon, we'll get the
2501 * next beacon and update then.
2502 */
2503
2504 /*
2505 * If an operating mode notification IE is present, override the
2506 * NSS calculation (that would be done in rate_control_rate_init())
2507 * and use the # of streams from that element.
2508 */
2509 if (elems.opmode_notif &&
2510 !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
2511 u8 nss;
2512
2513 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
2514 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
2515 nss += 1;
2516 sta->sta.rx_nss = nss;
2517 }
2518
2519 rate_control_rate_init(sta);
2520
2521 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2522 set_sta_flag(sta, WLAN_STA_MFP);
2523
2524 if (elems.wmm_param)
2525 set_sta_flag(sta, WLAN_STA_WME);
2526
2527 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2528 if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2529 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2530 if (err) {
2531 sdata_info(sdata,
2532 "failed to move station %pM to desired state\n",
2533 sta->sta.addr);
2534 WARN_ON(__sta_info_destroy(sta));
2535 mutex_unlock(&sdata->local->sta_mtx);
2536 return false;
2537 }
2538
2539 mutex_unlock(&sdata->local->sta_mtx);
2540
2541 /*
2542 * Always handle WMM once after association regardless
2543 * of the first value the AP uses. Setting -1 here has
2544 * that effect because the AP values is an unsigned
2545 * 4-bit value.
2546 */
2547 ifmgd->wmm_last_param_set = -1;
2548
2549 if (elems.wmm_param)
2550 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2551 elems.wmm_param_len);
2552 else
2553 ieee80211_set_wmm_default(sdata, false);
2554 changed |= BSS_CHANGED_QOS;
2555
2556 /* set AID and assoc capability,
2557 * ieee80211_set_associated() will tell the driver */
2558 bss_conf->aid = aid;
2559 bss_conf->assoc_capability = capab_info;
2560 ieee80211_set_associated(sdata, cbss, changed);
2561
2562 /*
2563 * If we're using 4-addr mode, let the AP know that we're
2564 * doing so, so that it can create the STA VLAN on its side
2565 */
2566 if (ifmgd->use_4addr)
2567 ieee80211_send_4addr_nullfunc(local, sdata);
2568
2569 /*
2570 * Start timer to probe the connection to the AP now.
2571 * Also start the timer that will detect beacon loss.
2572 */
2573 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2574 ieee80211_sta_reset_beacon_monitor(sdata);
2575
2576 return true;
2577 }
2578
2579 static enum rx_mgmt_action __must_check
2580 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2581 struct ieee80211_mgmt *mgmt, size_t len,
2582 struct cfg80211_bss **bss)
2583 {
2584 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2585 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2586 u16 capab_info, status_code, aid;
2587 struct ieee802_11_elems elems;
2588 u8 *pos;
2589 bool reassoc;
2590
2591 lockdep_assert_held(&ifmgd->mtx);
2592
2593 if (!assoc_data)
2594 return RX_MGMT_NONE;
2595 if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2596 return RX_MGMT_NONE;
2597
2598 /*
2599 * AssocResp and ReassocResp have identical structure, so process both
2600 * of them in this function.
2601 */
2602
2603 if (len < 24 + 6)
2604 return RX_MGMT_NONE;
2605
2606 reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2607 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2608 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2609 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2610
2611 sdata_info(sdata,
2612 "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
2613 reassoc ? "Rea" : "A", mgmt->sa,
2614 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2615
2616 pos = mgmt->u.assoc_resp.variable;
2617 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2618
2619 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2620 elems.timeout_int && elems.timeout_int_len == 5 &&
2621 elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2622 u32 tu, ms;
2623 tu = get_unaligned_le32(elems.timeout_int + 1);
2624 ms = tu * 1024 / 1000;
2625 sdata_info(sdata,
2626 "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
2627 mgmt->sa, tu, ms);
2628 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2629 assoc_data->timeout_started = true;
2630 if (ms > IEEE80211_ASSOC_TIMEOUT)
2631 run_again(ifmgd, assoc_data->timeout);
2632 return RX_MGMT_NONE;
2633 }
2634
2635 *bss = assoc_data->bss;
2636
2637 if (status_code != WLAN_STATUS_SUCCESS) {
2638 sdata_info(sdata, "%pM denied association (code=%d)\n",
2639 mgmt->sa, status_code);
2640 ieee80211_destroy_assoc_data(sdata, false);
2641 } else {
2642 if (!ieee80211_assoc_success(sdata, *bss, mgmt, len)) {
2643 /* oops -- internal error -- send timeout for now */
2644 ieee80211_destroy_assoc_data(sdata, false);
2645 cfg80211_put_bss(sdata->local->hw.wiphy, *bss);
2646 return RX_MGMT_CFG80211_ASSOC_TIMEOUT;
2647 }
2648 sdata_info(sdata, "associated\n");
2649
2650 /*
2651 * destroy assoc_data afterwards, as otherwise an idle
2652 * recalc after assoc_data is NULL but before associated
2653 * is set can cause the interface to go idle
2654 */
2655 ieee80211_destroy_assoc_data(sdata, true);
2656 }
2657
2658 return RX_MGMT_CFG80211_RX_ASSOC;
2659 }
2660
2661 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2662 struct ieee80211_mgmt *mgmt, size_t len,
2663 struct ieee80211_rx_status *rx_status,
2664 struct ieee802_11_elems *elems)
2665 {
2666 struct ieee80211_local *local = sdata->local;
2667 int freq;
2668 struct ieee80211_bss *bss;
2669 struct ieee80211_channel *channel;
2670 bool need_ps = false;
2671
2672 if ((sdata->u.mgd.associated &&
2673 ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid)) ||
2674 (sdata->u.mgd.assoc_data &&
2675 ether_addr_equal(mgmt->bssid,
2676 sdata->u.mgd.assoc_data->bss->bssid))) {
2677 /* not previously set so we may need to recalc */
2678 need_ps = sdata->u.mgd.associated && !sdata->u.mgd.dtim_period;
2679
2680 if (elems->tim && !elems->parse_error) {
2681 const struct ieee80211_tim_ie *tim_ie = elems->tim;
2682 sdata->u.mgd.dtim_period = tim_ie->dtim_period;
2683 }
2684 }
2685
2686 if (elems->ds_params && elems->ds_params_len == 1)
2687 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
2688 rx_status->band);
2689 else
2690 freq = rx_status->freq;
2691
2692 channel = ieee80211_get_channel(local->hw.wiphy, freq);
2693
2694 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2695 return;
2696
2697 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2698 channel);
2699 if (bss)
2700 ieee80211_rx_bss_put(local, bss);
2701
2702 if (!sdata->u.mgd.associated)
2703 return;
2704
2705 if (need_ps) {
2706 mutex_lock(&local->iflist_mtx);
2707 ieee80211_recalc_ps(local, -1);
2708 mutex_unlock(&local->iflist_mtx);
2709 }
2710
2711 if (elems->ch_switch_ie &&
2712 memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid, ETH_ALEN) == 0)
2713 ieee80211_sta_process_chanswitch(sdata, elems->ch_switch_ie,
2714 bss, rx_status->mactime);
2715 }
2716
2717
2718 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2719 struct sk_buff *skb)
2720 {
2721 struct ieee80211_mgmt *mgmt = (void *)skb->data;
2722 struct ieee80211_if_managed *ifmgd;
2723 struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2724 size_t baselen, len = skb->len;
2725 struct ieee802_11_elems elems;
2726
2727 ifmgd = &sdata->u.mgd;
2728
2729 ASSERT_MGD_MTX(ifmgd);
2730
2731 if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2732 return; /* ignore ProbeResp to foreign address */
2733
2734 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2735 if (baselen > len)
2736 return;
2737
2738 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2739 &elems);
2740
2741 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2742
2743 if (ifmgd->associated &&
2744 ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2745 ieee80211_reset_ap_probe(sdata);
2746
2747 if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2748 ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
2749 /* got probe response, continue with auth */
2750 sdata_info(sdata, "direct probe responded\n");
2751 ifmgd->auth_data->tries = 0;
2752 ifmgd->auth_data->timeout = jiffies;
2753 ifmgd->auth_data->timeout_started = true;
2754 run_again(ifmgd, ifmgd->auth_data->timeout);
2755 }
2756 }
2757
2758 /*
2759 * This is the canonical list of information elements we care about,
2760 * the filter code also gives us all changes to the Microsoft OUI
2761 * (00:50:F2) vendor IE which is used for WMM which we need to track.
2762 *
2763 * We implement beacon filtering in software since that means we can
2764 * avoid processing the frame here and in cfg80211, and userspace
2765 * will not be able to tell whether the hardware supports it or not.
2766 *
2767 * XXX: This list needs to be dynamic -- userspace needs to be able to
2768 * add items it requires. It also needs to be able to tell us to
2769 * look out for other vendor IEs.
2770 */
2771 static const u64 care_about_ies =
2772 (1ULL << WLAN_EID_COUNTRY) |
2773 (1ULL << WLAN_EID_ERP_INFO) |
2774 (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2775 (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2776 (1ULL << WLAN_EID_HT_CAPABILITY) |
2777 (1ULL << WLAN_EID_HT_OPERATION);
2778
2779 static enum rx_mgmt_action
2780 ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2781 struct ieee80211_mgmt *mgmt, size_t len,
2782 u8 *deauth_buf, struct ieee80211_rx_status *rx_status)
2783 {
2784 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2785 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2786 size_t baselen;
2787 struct ieee802_11_elems elems;
2788 struct ieee80211_local *local = sdata->local;
2789 struct ieee80211_chanctx_conf *chanctx_conf;
2790 struct ieee80211_channel *chan;
2791 struct sta_info *sta;
2792 u32 changed = 0;
2793 bool erp_valid;
2794 u8 erp_value = 0;
2795 u32 ncrc;
2796 u8 *bssid;
2797
2798 lockdep_assert_held(&ifmgd->mtx);
2799
2800 /* Process beacon from the current BSS */
2801 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2802 if (baselen > len)
2803 return RX_MGMT_NONE;
2804
2805 rcu_read_lock();
2806 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2807 if (!chanctx_conf) {
2808 rcu_read_unlock();
2809 return RX_MGMT_NONE;
2810 }
2811
2812 if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
2813 rcu_read_unlock();
2814 return RX_MGMT_NONE;
2815 }
2816 chan = chanctx_conf->def.chan;
2817 rcu_read_unlock();
2818
2819 if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
2820 ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2821 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2822 len - baselen, &elems);
2823
2824 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2825 ifmgd->assoc_data->have_beacon = true;
2826 ifmgd->assoc_data->need_beacon = false;
2827 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
2828 sdata->vif.bss_conf.sync_tsf =
2829 le64_to_cpu(mgmt->u.beacon.timestamp);
2830 sdata->vif.bss_conf.sync_device_ts =
2831 rx_status->device_timestamp;
2832 if (elems.tim)
2833 sdata->vif.bss_conf.sync_dtim_count =
2834 elems.tim->dtim_count;
2835 else
2836 sdata->vif.bss_conf.sync_dtim_count = 0;
2837 }
2838 /* continue assoc process */
2839 ifmgd->assoc_data->timeout = jiffies;
2840 ifmgd->assoc_data->timeout_started = true;
2841 run_again(ifmgd, ifmgd->assoc_data->timeout);
2842 return RX_MGMT_NONE;
2843 }
2844
2845 if (!ifmgd->associated ||
2846 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2847 return RX_MGMT_NONE;
2848 bssid = ifmgd->associated->bssid;
2849
2850 /* Track average RSSI from the Beacon frames of the current AP */
2851 ifmgd->last_beacon_signal = rx_status->signal;
2852 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2853 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2854 ifmgd->ave_beacon_signal = rx_status->signal * 16;
2855 ifmgd->last_cqm_event_signal = 0;
2856 ifmgd->count_beacon_signal = 1;
2857 ifmgd->last_ave_beacon_signal = 0;
2858 } else {
2859 ifmgd->ave_beacon_signal =
2860 (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
2861 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
2862 ifmgd->ave_beacon_signal) / 16;
2863 ifmgd->count_beacon_signal++;
2864 }
2865
2866 if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
2867 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
2868 int sig = ifmgd->ave_beacon_signal;
2869 int last_sig = ifmgd->last_ave_beacon_signal;
2870
2871 /*
2872 * if signal crosses either of the boundaries, invoke callback
2873 * with appropriate parameters
2874 */
2875 if (sig > ifmgd->rssi_max_thold &&
2876 (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
2877 ifmgd->last_ave_beacon_signal = sig;
2878 drv_rssi_callback(local, sdata, RSSI_EVENT_HIGH);
2879 } else if (sig < ifmgd->rssi_min_thold &&
2880 (last_sig >= ifmgd->rssi_max_thold ||
2881 last_sig == 0)) {
2882 ifmgd->last_ave_beacon_signal = sig;
2883 drv_rssi_callback(local, sdata, RSSI_EVENT_LOW);
2884 }
2885 }
2886
2887 if (bss_conf->cqm_rssi_thold &&
2888 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
2889 !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
2890 int sig = ifmgd->ave_beacon_signal / 16;
2891 int last_event = ifmgd->last_cqm_event_signal;
2892 int thold = bss_conf->cqm_rssi_thold;
2893 int hyst = bss_conf->cqm_rssi_hyst;
2894 if (sig < thold &&
2895 (last_event == 0 || sig < last_event - hyst)) {
2896 ifmgd->last_cqm_event_signal = sig;
2897 ieee80211_cqm_rssi_notify(
2898 &sdata->vif,
2899 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
2900 GFP_KERNEL);
2901 } else if (sig > thold &&
2902 (last_event == 0 || sig > last_event + hyst)) {
2903 ifmgd->last_cqm_event_signal = sig;
2904 ieee80211_cqm_rssi_notify(
2905 &sdata->vif,
2906 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
2907 GFP_KERNEL);
2908 }
2909 }
2910
2911 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
2912 mlme_dbg_ratelimited(sdata,
2913 "cancelling AP probe due to a received beacon\n");
2914 mutex_lock(&local->mtx);
2915 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
2916 ieee80211_run_deferred_scan(local);
2917 mutex_unlock(&local->mtx);
2918
2919 mutex_lock(&local->iflist_mtx);
2920 ieee80211_recalc_ps(local, -1);
2921 mutex_unlock(&local->iflist_mtx);
2922 }
2923
2924 /*
2925 * Push the beacon loss detection into the future since
2926 * we are processing a beacon from the AP just now.
2927 */
2928 ieee80211_sta_reset_beacon_monitor(sdata);
2929
2930 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
2931 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
2932 len - baselen, &elems,
2933 care_about_ies, ncrc);
2934
2935 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
2936 bool directed_tim = ieee80211_check_tim(elems.tim,
2937 elems.tim_len,
2938 ifmgd->aid);
2939 if (directed_tim) {
2940 if (local->hw.conf.dynamic_ps_timeout > 0) {
2941 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2942 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2943 ieee80211_hw_config(local,
2944 IEEE80211_CONF_CHANGE_PS);
2945 }
2946 ieee80211_send_nullfunc(local, sdata, 0);
2947 } else if (!local->pspolling && sdata->u.mgd.powersave) {
2948 local->pspolling = true;
2949
2950 /*
2951 * Here is assumed that the driver will be
2952 * able to send ps-poll frame and receive a
2953 * response even though power save mode is
2954 * enabled, but some drivers might require
2955 * to disable power save here. This needs
2956 * to be investigated.
2957 */
2958 ieee80211_send_pspoll(local, sdata);
2959 }
2960 }
2961 }
2962
2963 if (sdata->vif.p2p) {
2964 struct ieee80211_p2p_noa_attr noa = {};
2965 int ret;
2966
2967 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
2968 len - baselen,
2969 IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
2970 (u8 *) &noa, sizeof(noa));
2971 if (ret >= 2) {
2972 if (sdata->u.mgd.p2p_noa_index != noa.index) {
2973 /* valid noa_attr and index changed */
2974 sdata->u.mgd.p2p_noa_index = noa.index;
2975 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
2976 changed |= BSS_CHANGED_P2P_PS;
2977 /*
2978 * make sure we update all information, the CRC
2979 * mechanism doesn't look at P2P attributes.
2980 */
2981 ifmgd->beacon_crc_valid = false;
2982 }
2983 } else if (sdata->u.mgd.p2p_noa_index != -1) {
2984 /* noa_attr not found and we had valid noa_attr before */
2985 sdata->u.mgd.p2p_noa_index = -1;
2986 memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
2987 changed |= BSS_CHANGED_P2P_PS;
2988 ifmgd->beacon_crc_valid = false;
2989 }
2990 }
2991
2992 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
2993 return RX_MGMT_NONE;
2994 ifmgd->beacon_crc = ncrc;
2995 ifmgd->beacon_crc_valid = true;
2996
2997 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2998
2999 if (ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3000 elems.wmm_param_len))
3001 changed |= BSS_CHANGED_QOS;
3002
3003 /*
3004 * If we haven't had a beacon before, tell the driver about the
3005 * DTIM period (and beacon timing if desired) now.
3006 */
3007 if (!bss_conf->dtim_period) {
3008 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3009 if (elems.tim)
3010 bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3011 else
3012 bss_conf->dtim_period = 1;
3013
3014 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
3015 sdata->vif.bss_conf.sync_tsf =
3016 le64_to_cpu(mgmt->u.beacon.timestamp);
3017 sdata->vif.bss_conf.sync_device_ts =
3018 rx_status->device_timestamp;
3019 if (elems.tim)
3020 sdata->vif.bss_conf.sync_dtim_count =
3021 elems.tim->dtim_count;
3022 else
3023 sdata->vif.bss_conf.sync_dtim_count = 0;
3024 }
3025
3026 changed |= BSS_CHANGED_DTIM_PERIOD;
3027 }
3028
3029 if (elems.erp_info && elems.erp_info_len >= 1) {
3030 erp_valid = true;
3031 erp_value = elems.erp_info[0];
3032 } else {
3033 erp_valid = false;
3034 }
3035 changed |= ieee80211_handle_bss_capability(sdata,
3036 le16_to_cpu(mgmt->u.beacon.capab_info),
3037 erp_valid, erp_value);
3038
3039 mutex_lock(&local->sta_mtx);
3040 sta = sta_info_get(sdata, bssid);
3041
3042 if (ieee80211_config_bw(sdata, sta, elems.ht_operation,
3043 elems.vht_operation, bssid, &changed)) {
3044 mutex_unlock(&local->sta_mtx);
3045 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3046 WLAN_REASON_DEAUTH_LEAVING,
3047 true, deauth_buf);
3048 return RX_MGMT_CFG80211_TX_DEAUTH;
3049 }
3050
3051 if (sta && elems.opmode_notif)
3052 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3053 rx_status->band, true);
3054 mutex_unlock(&local->sta_mtx);
3055
3056 if (elems.country_elem && elems.pwr_constr_elem &&
3057 mgmt->u.probe_resp.capab_info &
3058 cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT))
3059 changed |= ieee80211_handle_pwr_constr(sdata, chan,
3060 elems.country_elem,
3061 elems.country_elem_len,
3062 elems.pwr_constr_elem);
3063
3064 ieee80211_bss_info_change_notify(sdata, changed);
3065
3066 return RX_MGMT_NONE;
3067 }
3068
3069 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3070 struct sk_buff *skb)
3071 {
3072 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3073 struct ieee80211_rx_status *rx_status;
3074 struct ieee80211_mgmt *mgmt;
3075 struct cfg80211_bss *bss = NULL;
3076 enum rx_mgmt_action rma = RX_MGMT_NONE;
3077 u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3078 u16 fc;
3079
3080 rx_status = (struct ieee80211_rx_status *) skb->cb;
3081 mgmt = (struct ieee80211_mgmt *) skb->data;
3082 fc = le16_to_cpu(mgmt->frame_control);
3083
3084 mutex_lock(&ifmgd->mtx);
3085
3086 switch (fc & IEEE80211_FCTL_STYPE) {
3087 case IEEE80211_STYPE_BEACON:
3088 rma = ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
3089 deauth_buf, rx_status);
3090 break;
3091 case IEEE80211_STYPE_PROBE_RESP:
3092 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3093 break;
3094 case IEEE80211_STYPE_AUTH:
3095 rma = ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3096 break;
3097 case IEEE80211_STYPE_DEAUTH:
3098 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3099 break;
3100 case IEEE80211_STYPE_DISASSOC:
3101 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3102 break;
3103 case IEEE80211_STYPE_ASSOC_RESP:
3104 case IEEE80211_STYPE_REASSOC_RESP:
3105 rma = ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, &bss);
3106 break;
3107 case IEEE80211_STYPE_ACTION:
3108 switch (mgmt->u.action.category) {
3109 case WLAN_CATEGORY_SPECTRUM_MGMT:
3110 ieee80211_sta_process_chanswitch(sdata,
3111 &mgmt->u.action.u.chan_switch.sw_elem,
3112 (void *)ifmgd->associated->priv,
3113 rx_status->mactime);
3114 break;
3115 }
3116 }
3117 mutex_unlock(&ifmgd->mtx);
3118
3119 switch (rma) {
3120 case RX_MGMT_NONE:
3121 /* no action */
3122 break;
3123 case RX_MGMT_CFG80211_DEAUTH:
3124 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
3125 break;
3126 case RX_MGMT_CFG80211_DISASSOC:
3127 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
3128 break;
3129 case RX_MGMT_CFG80211_RX_AUTH:
3130 cfg80211_send_rx_auth(sdata->dev, (u8 *)mgmt, skb->len);
3131 break;
3132 case RX_MGMT_CFG80211_RX_ASSOC:
3133 cfg80211_send_rx_assoc(sdata->dev, bss, (u8 *)mgmt, skb->len);
3134 break;
3135 case RX_MGMT_CFG80211_ASSOC_TIMEOUT:
3136 cfg80211_send_assoc_timeout(sdata->dev, mgmt->bssid);
3137 break;
3138 case RX_MGMT_CFG80211_TX_DEAUTH:
3139 cfg80211_send_deauth(sdata->dev, deauth_buf,
3140 sizeof(deauth_buf));
3141 break;
3142 default:
3143 WARN(1, "unexpected: %d", rma);
3144 }
3145 }
3146
3147 static void ieee80211_sta_timer(unsigned long data)
3148 {
3149 struct ieee80211_sub_if_data *sdata =
3150 (struct ieee80211_sub_if_data *) data;
3151
3152 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3153 }
3154
3155 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3156 u8 *bssid, u8 reason, bool tx)
3157 {
3158 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3159 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3160
3161 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3162 tx, frame_buf);
3163 mutex_unlock(&ifmgd->mtx);
3164
3165 /*
3166 * must be outside lock due to cfg80211,
3167 * but that's not a problem.
3168 */
3169 cfg80211_send_deauth(sdata->dev, frame_buf, IEEE80211_DEAUTH_FRAME_LEN);
3170
3171 mutex_lock(&ifmgd->mtx);
3172 }
3173
3174 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
3175 {
3176 struct ieee80211_local *local = sdata->local;
3177 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3178 struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3179 u32 tx_flags = 0;
3180
3181 lockdep_assert_held(&ifmgd->mtx);
3182
3183 if (WARN_ON_ONCE(!auth_data))
3184 return -EINVAL;
3185
3186 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3187 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3188 IEEE80211_TX_INTFL_MLME_CONN_TX;
3189
3190 auth_data->tries++;
3191
3192 if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3193 sdata_info(sdata, "authentication with %pM timed out\n",
3194 auth_data->bss->bssid);
3195
3196 /*
3197 * Most likely AP is not in the range so remove the
3198 * bss struct for that AP.
3199 */
3200 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3201
3202 return -ETIMEDOUT;
3203 }
3204
3205 drv_mgd_prepare_tx(local, sdata);
3206
3207 if (auth_data->bss->proberesp_ies) {
3208 u16 trans = 1;
3209 u16 status = 0;
3210
3211 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3212 auth_data->bss->bssid, auth_data->tries,
3213 IEEE80211_AUTH_MAX_TRIES);
3214
3215 auth_data->expected_transaction = 2;
3216
3217 if (auth_data->algorithm == WLAN_AUTH_SAE) {
3218 trans = auth_data->sae_trans;
3219 status = auth_data->sae_status;
3220 auth_data->expected_transaction = trans;
3221 }
3222
3223 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3224 auth_data->data, auth_data->data_len,
3225 auth_data->bss->bssid,
3226 auth_data->bss->bssid, NULL, 0, 0,
3227 tx_flags);
3228 } else {
3229 const u8 *ssidie;
3230
3231 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
3232 auth_data->bss->bssid, auth_data->tries,
3233 IEEE80211_AUTH_MAX_TRIES);
3234
3235 rcu_read_lock();
3236 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
3237 if (!ssidie) {
3238 rcu_read_unlock();
3239 return -EINVAL;
3240 }
3241 /*
3242 * Direct probe is sent to broadcast address as some APs
3243 * will not answer to direct packet in unassociated state.
3244 */
3245 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
3246 NULL, 0, (u32) -1, true, tx_flags,
3247 auth_data->bss->channel, false);
3248 rcu_read_unlock();
3249 }
3250
3251 if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
3252 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3253 ifmgd->auth_data->timeout_started = true;
3254 run_again(ifmgd, auth_data->timeout);
3255 } else {
3256 auth_data->timeout_started = false;
3257 }
3258
3259 return 0;
3260 }
3261
3262 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3263 {
3264 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3265 struct ieee80211_local *local = sdata->local;
3266
3267 lockdep_assert_held(&sdata->u.mgd.mtx);
3268
3269 assoc_data->tries++;
3270 if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3271 sdata_info(sdata, "association with %pM timed out\n",
3272 assoc_data->bss->bssid);
3273
3274 /*
3275 * Most likely AP is not in the range so remove the
3276 * bss struct for that AP.
3277 */
3278 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3279
3280 return -ETIMEDOUT;
3281 }
3282
3283 sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3284 assoc_data->bss->bssid, assoc_data->tries,
3285 IEEE80211_ASSOC_MAX_TRIES);
3286 ieee80211_send_assoc(sdata);
3287
3288 if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
3289 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3290 assoc_data->timeout_started = true;
3291 run_again(&sdata->u.mgd, assoc_data->timeout);
3292 } else {
3293 assoc_data->timeout_started = false;
3294 }
3295
3296 return 0;
3297 }
3298
3299 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3300 __le16 fc, bool acked)
3301 {
3302 struct ieee80211_local *local = sdata->local;
3303
3304 sdata->u.mgd.status_fc = fc;
3305 sdata->u.mgd.status_acked = acked;
3306 sdata->u.mgd.status_received = true;
3307
3308 ieee80211_queue_work(&local->hw, &sdata->work);
3309 }
3310
3311 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3312 {
3313 struct ieee80211_local *local = sdata->local;
3314 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3315
3316 mutex_lock(&ifmgd->mtx);
3317
3318 if (ifmgd->status_received) {
3319 __le16 fc = ifmgd->status_fc;
3320 bool status_acked = ifmgd->status_acked;
3321
3322 ifmgd->status_received = false;
3323 if (ifmgd->auth_data &&
3324 (ieee80211_is_probe_req(fc) || ieee80211_is_auth(fc))) {
3325 if (status_acked) {
3326 ifmgd->auth_data->timeout =
3327 jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3328 run_again(ifmgd, ifmgd->auth_data->timeout);
3329 } else {
3330 ifmgd->auth_data->timeout = jiffies - 1;
3331 }
3332 ifmgd->auth_data->timeout_started = true;
3333 } else if (ifmgd->assoc_data &&
3334 (ieee80211_is_assoc_req(fc) ||
3335 ieee80211_is_reassoc_req(fc))) {
3336 if (status_acked) {
3337 ifmgd->assoc_data->timeout =
3338 jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3339 run_again(ifmgd, ifmgd->assoc_data->timeout);
3340 } else {
3341 ifmgd->assoc_data->timeout = jiffies - 1;
3342 }
3343 ifmgd->assoc_data->timeout_started = true;
3344 }
3345 }
3346
3347 if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3348 time_after(jiffies, ifmgd->auth_data->timeout)) {
3349 if (ifmgd->auth_data->done) {
3350 /*
3351 * ok ... we waited for assoc but userspace didn't,
3352 * so let's just kill the auth data
3353 */
3354 ieee80211_destroy_auth_data(sdata, false);
3355 } else if (ieee80211_probe_auth(sdata)) {
3356 u8 bssid[ETH_ALEN];
3357
3358 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3359
3360 ieee80211_destroy_auth_data(sdata, false);
3361
3362 mutex_unlock(&ifmgd->mtx);
3363 cfg80211_send_auth_timeout(sdata->dev, bssid);
3364 mutex_lock(&ifmgd->mtx);
3365 }
3366 } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3367 run_again(ifmgd, ifmgd->auth_data->timeout);
3368
3369 if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3370 time_after(jiffies, ifmgd->assoc_data->timeout)) {
3371 if ((ifmgd->assoc_data->need_beacon &&
3372 !ifmgd->assoc_data->have_beacon) ||
3373 ieee80211_do_assoc(sdata)) {
3374 u8 bssid[ETH_ALEN];
3375
3376 memcpy(bssid, ifmgd->assoc_data->bss->bssid, ETH_ALEN);
3377
3378 ieee80211_destroy_assoc_data(sdata, false);
3379
3380 mutex_unlock(&ifmgd->mtx);
3381 cfg80211_send_assoc_timeout(sdata->dev, bssid);
3382 mutex_lock(&ifmgd->mtx);
3383 }
3384 } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3385 run_again(ifmgd, ifmgd->assoc_data->timeout);
3386
3387 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
3388 IEEE80211_STA_CONNECTION_POLL) &&
3389 ifmgd->associated) {
3390 u8 bssid[ETH_ALEN];
3391 int max_tries;
3392
3393 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3394
3395 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3396 max_tries = max_nullfunc_tries;
3397 else
3398 max_tries = max_probe_tries;
3399
3400 /* ACK received for nullfunc probing frame */
3401 if (!ifmgd->probe_send_count)
3402 ieee80211_reset_ap_probe(sdata);
3403 else if (ifmgd->nullfunc_failed) {
3404 if (ifmgd->probe_send_count < max_tries) {
3405 mlme_dbg(sdata,
3406 "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3407 bssid, ifmgd->probe_send_count,
3408 max_tries);
3409 ieee80211_mgd_probe_ap_send(sdata);
3410 } else {
3411 mlme_dbg(sdata,
3412 "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3413 bssid);
3414 ieee80211_sta_connection_lost(sdata, bssid,
3415 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3416 false);
3417 }
3418 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3419 run_again(ifmgd, ifmgd->probe_timeout);
3420 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
3421 mlme_dbg(sdata,
3422 "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3423 bssid, probe_wait_ms);
3424 ieee80211_sta_connection_lost(sdata, bssid,
3425 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3426 } else if (ifmgd->probe_send_count < max_tries) {
3427 mlme_dbg(sdata,
3428 "No probe response from AP %pM after %dms, try %d/%i\n",
3429 bssid, probe_wait_ms,
3430 ifmgd->probe_send_count, max_tries);
3431 ieee80211_mgd_probe_ap_send(sdata);
3432 } else {
3433 /*
3434 * We actually lost the connection ... or did we?
3435 * Let's make sure!
3436 */
3437 wiphy_debug(local->hw.wiphy,
3438 "%s: No probe response from AP %pM"
3439 " after %dms, disconnecting.\n",
3440 sdata->name,
3441 bssid, probe_wait_ms);
3442
3443 ieee80211_sta_connection_lost(sdata, bssid,
3444 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3445 }
3446 }
3447
3448 mutex_unlock(&ifmgd->mtx);
3449 }
3450
3451 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3452 {
3453 struct ieee80211_sub_if_data *sdata =
3454 (struct ieee80211_sub_if_data *) data;
3455 struct ieee80211_local *local = sdata->local;
3456
3457 if (local->quiescing)
3458 return;
3459
3460 sdata->u.mgd.connection_loss = false;
3461 ieee80211_queue_work(&sdata->local->hw,
3462 &sdata->u.mgd.beacon_connection_loss_work);
3463 }
3464
3465 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3466 {
3467 struct ieee80211_sub_if_data *sdata =
3468 (struct ieee80211_sub_if_data *) data;
3469 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3470 struct ieee80211_local *local = sdata->local;
3471
3472 if (local->quiescing)
3473 return;
3474
3475 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3476 }
3477
3478 static void ieee80211_sta_monitor_work(struct work_struct *work)
3479 {
3480 struct ieee80211_sub_if_data *sdata =
3481 container_of(work, struct ieee80211_sub_if_data,
3482 u.mgd.monitor_work);
3483
3484 ieee80211_mgd_probe_ap(sdata, false);
3485 }
3486
3487 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3488 {
3489 u32 flags;
3490
3491 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3492 __ieee80211_stop_poll(sdata);
3493
3494 /* let's probe the connection once */
3495 flags = sdata->local->hw.flags;
3496 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
3497 ieee80211_queue_work(&sdata->local->hw,
3498 &sdata->u.mgd.monitor_work);
3499 /* and do all the other regular work too */
3500 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3501 }
3502 }
3503
3504 /* interface setup */
3505 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3506 {
3507 struct ieee80211_if_managed *ifmgd;
3508
3509 ifmgd = &sdata->u.mgd;
3510 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3511 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3512 INIT_WORK(&ifmgd->beacon_connection_loss_work,
3513 ieee80211_beacon_connection_loss_work);
3514 INIT_WORK(&ifmgd->csa_connection_drop_work,
3515 ieee80211_csa_connection_drop_work);
3516 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
3517 setup_timer(&ifmgd->timer, ieee80211_sta_timer,
3518 (unsigned long) sdata);
3519 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
3520 (unsigned long) sdata);
3521 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
3522 (unsigned long) sdata);
3523 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
3524 (unsigned long) sdata);
3525
3526 ifmgd->flags = 0;
3527 ifmgd->powersave = sdata->wdev.ps;
3528 ifmgd->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
3529 ifmgd->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
3530 ifmgd->p2p_noa_index = -1;
3531
3532 mutex_init(&ifmgd->mtx);
3533
3534 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
3535 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
3536 else
3537 ifmgd->req_smps = IEEE80211_SMPS_OFF;
3538 }
3539
3540 /* scan finished notification */
3541 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
3542 {
3543 struct ieee80211_sub_if_data *sdata;
3544
3545 /* Restart STA timers */
3546 rcu_read_lock();
3547 list_for_each_entry_rcu(sdata, &local->interfaces, list)
3548 ieee80211_restart_sta_timer(sdata);
3549 rcu_read_unlock();
3550 }
3551
3552 int ieee80211_max_network_latency(struct notifier_block *nb,
3553 unsigned long data, void *dummy)
3554 {
3555 s32 latency_usec = (s32) data;
3556 struct ieee80211_local *local =
3557 container_of(nb, struct ieee80211_local,
3558 network_latency_notifier);
3559
3560 mutex_lock(&local->iflist_mtx);
3561 ieee80211_recalc_ps(local, latency_usec);
3562 mutex_unlock(&local->iflist_mtx);
3563
3564 return 0;
3565 }
3566
3567 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
3568 struct cfg80211_bss *cbss)
3569 {
3570 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3571 const u8 *ht_cap_ie, *vht_cap_ie;
3572 const struct ieee80211_ht_cap *ht_cap;
3573 const struct ieee80211_vht_cap *vht_cap;
3574 u8 chains = 1;
3575
3576 if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
3577 return chains;
3578
3579 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
3580 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
3581 ht_cap = (void *)(ht_cap_ie + 2);
3582 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
3583 /*
3584 * TODO: use "Tx Maximum Number Spatial Streams Supported" and
3585 * "Tx Unequal Modulation Supported" fields.
3586 */
3587 }
3588
3589 if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
3590 return chains;
3591
3592 vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
3593 if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
3594 u8 nss;
3595 u16 tx_mcs_map;
3596
3597 vht_cap = (void *)(vht_cap_ie + 2);
3598 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
3599 for (nss = 8; nss > 0; nss--) {
3600 if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
3601 IEEE80211_VHT_MCS_NOT_SUPPORTED)
3602 break;
3603 }
3604 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
3605 chains = max(chains, nss);
3606 }
3607
3608 return chains;
3609 }
3610
3611 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
3612 struct cfg80211_bss *cbss)
3613 {
3614 struct ieee80211_local *local = sdata->local;
3615 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3616 const struct ieee80211_ht_operation *ht_oper = NULL;
3617 const struct ieee80211_vht_operation *vht_oper = NULL;
3618 struct ieee80211_supported_band *sband;
3619 struct cfg80211_chan_def chandef;
3620 int ret;
3621
3622 sband = local->hw.wiphy->bands[cbss->channel->band];
3623
3624 ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
3625 IEEE80211_STA_DISABLE_80P80MHZ |
3626 IEEE80211_STA_DISABLE_160MHZ);
3627
3628 rcu_read_lock();
3629
3630 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
3631 sband->ht_cap.ht_supported) {
3632 const u8 *ht_oper_ie, *ht_cap;
3633
3634 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
3635 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3636 ht_oper = (void *)(ht_oper_ie + 2);
3637
3638 ht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
3639 if (!ht_cap || ht_cap[1] < sizeof(struct ieee80211_ht_cap)) {
3640 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3641 ht_oper = NULL;
3642 }
3643 }
3644
3645 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
3646 sband->vht_cap.vht_supported) {
3647 const u8 *vht_oper_ie, *vht_cap;
3648
3649 vht_oper_ie = ieee80211_bss_get_ie(cbss,
3650 WLAN_EID_VHT_OPERATION);
3651 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
3652 vht_oper = (void *)(vht_oper_ie + 2);
3653 if (vht_oper && !ht_oper) {
3654 vht_oper = NULL;
3655 sdata_info(sdata,
3656 "AP advertised VHT without HT, disabling both\n");
3657 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3658 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3659 }
3660
3661 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
3662 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
3663 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3664 vht_oper = NULL;
3665 }
3666 }
3667
3668 ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
3669 cbss->channel,
3670 ht_oper, vht_oper,
3671 &chandef, true);
3672
3673 sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
3674 local->rx_chains);
3675
3676 rcu_read_unlock();
3677
3678 /* will change later if needed */
3679 sdata->smps_mode = IEEE80211_SMPS_OFF;
3680
3681 /*
3682 * If this fails (possibly due to channel context sharing
3683 * on incompatible channels, e.g. 80+80 and 160 sharing the
3684 * same control channel) try to use a smaller bandwidth.
3685 */
3686 ret = ieee80211_vif_use_channel(sdata, &chandef,
3687 IEEE80211_CHANCTX_SHARED);
3688 while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
3689 ifmgd->flags |= chandef_downgrade(&chandef);
3690 ret = ieee80211_vif_use_channel(sdata, &chandef,
3691 IEEE80211_CHANCTX_SHARED);
3692 }
3693 return ret;
3694 }
3695
3696 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3697 struct cfg80211_bss *cbss, bool assoc)
3698 {
3699 struct ieee80211_local *local = sdata->local;
3700 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3701 struct ieee80211_bss *bss = (void *)cbss->priv;
3702 struct sta_info *new_sta = NULL;
3703 bool have_sta = false;
3704 int err;
3705
3706 if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3707 return -EINVAL;
3708
3709 if (assoc) {
3710 rcu_read_lock();
3711 have_sta = sta_info_get(sdata, cbss->bssid);
3712 rcu_read_unlock();
3713 }
3714
3715 if (!have_sta) {
3716 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3717 if (!new_sta)
3718 return -ENOMEM;
3719 }
3720
3721 if (new_sta) {
3722 u32 rates = 0, basic_rates = 0;
3723 bool have_higher_than_11mbit;
3724 int min_rate = INT_MAX, min_rate_index = -1;
3725 struct ieee80211_supported_band *sband;
3726 const struct cfg80211_bss_ies *ies;
3727
3728 sband = local->hw.wiphy->bands[cbss->channel->band];
3729
3730 err = ieee80211_prep_channel(sdata, cbss);
3731 if (err) {
3732 sta_info_free(local, new_sta);
3733 return err;
3734 }
3735
3736 ieee80211_get_rates(sband, bss->supp_rates,
3737 bss->supp_rates_len,
3738 &rates, &basic_rates,
3739 &have_higher_than_11mbit,
3740 &min_rate, &min_rate_index);
3741
3742 /*
3743 * This used to be a workaround for basic rates missing
3744 * in the association response frame. Now that we no
3745 * longer use the basic rates from there, it probably
3746 * doesn't happen any more, but keep the workaround so
3747 * in case some *other* APs are buggy in different ways
3748 * we can connect -- with a warning.
3749 */
3750 if (!basic_rates && min_rate_index >= 0) {
3751 sdata_info(sdata,
3752 "No basic rates, using min rate instead\n");
3753 basic_rates = BIT(min_rate_index);
3754 }
3755
3756 new_sta->sta.supp_rates[cbss->channel->band] = rates;
3757 sdata->vif.bss_conf.basic_rates = basic_rates;
3758
3759 /* cf. IEEE 802.11 9.2.12 */
3760 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
3761 have_higher_than_11mbit)
3762 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
3763 else
3764 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
3765
3766 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
3767
3768 /* set timing information */
3769 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
3770 rcu_read_lock();
3771 ies = rcu_dereference(cbss->beacon_ies);
3772 if (ies) {
3773 const u8 *tim_ie;
3774
3775 sdata->vif.bss_conf.sync_tsf = ies->tsf;
3776 sdata->vif.bss_conf.sync_device_ts =
3777 bss->device_ts_beacon;
3778 tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
3779 ies->data, ies->len);
3780 if (tim_ie && tim_ie[1] >= 2)
3781 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
3782 else
3783 sdata->vif.bss_conf.sync_dtim_count = 0;
3784 } else if (!(local->hw.flags &
3785 IEEE80211_HW_TIMING_BEACON_ONLY)) {
3786 ies = rcu_dereference(cbss->proberesp_ies);
3787 /* must be non-NULL since beacon IEs were NULL */
3788 sdata->vif.bss_conf.sync_tsf = ies->tsf;
3789 sdata->vif.bss_conf.sync_device_ts =
3790 bss->device_ts_presp;
3791 sdata->vif.bss_conf.sync_dtim_count = 0;
3792 } else {
3793 sdata->vif.bss_conf.sync_tsf = 0;
3794 sdata->vif.bss_conf.sync_device_ts = 0;
3795 sdata->vif.bss_conf.sync_dtim_count = 0;
3796 }
3797 rcu_read_unlock();
3798
3799 /* tell driver about BSSID, basic rates and timing */
3800 ieee80211_bss_info_change_notify(sdata,
3801 BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
3802 BSS_CHANGED_BEACON_INT);
3803
3804 if (assoc)
3805 sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
3806
3807 err = sta_info_insert(new_sta);
3808 new_sta = NULL;
3809 if (err) {
3810 sdata_info(sdata,
3811 "failed to insert STA entry for the AP (error %d)\n",
3812 err);
3813 return err;
3814 }
3815 } else
3816 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
3817
3818 return 0;
3819 }
3820
3821 /* config hooks */
3822 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
3823 struct cfg80211_auth_request *req)
3824 {
3825 struct ieee80211_local *local = sdata->local;
3826 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3827 struct ieee80211_mgd_auth_data *auth_data;
3828 u16 auth_alg;
3829 int err;
3830
3831 /* prepare auth data structure */
3832
3833 switch (req->auth_type) {
3834 case NL80211_AUTHTYPE_OPEN_SYSTEM:
3835 auth_alg = WLAN_AUTH_OPEN;
3836 break;
3837 case NL80211_AUTHTYPE_SHARED_KEY:
3838 if (IS_ERR(local->wep_tx_tfm))
3839 return -EOPNOTSUPP;
3840 auth_alg = WLAN_AUTH_SHARED_KEY;
3841 break;
3842 case NL80211_AUTHTYPE_FT:
3843 auth_alg = WLAN_AUTH_FT;
3844 break;
3845 case NL80211_AUTHTYPE_NETWORK_EAP:
3846 auth_alg = WLAN_AUTH_LEAP;
3847 break;
3848 case NL80211_AUTHTYPE_SAE:
3849 auth_alg = WLAN_AUTH_SAE;
3850 break;
3851 default:
3852 return -EOPNOTSUPP;
3853 }
3854
3855 auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
3856 req->ie_len, GFP_KERNEL);
3857 if (!auth_data)
3858 return -ENOMEM;
3859
3860 auth_data->bss = req->bss;
3861
3862 if (req->sae_data_len >= 4) {
3863 __le16 *pos = (__le16 *) req->sae_data;
3864 auth_data->sae_trans = le16_to_cpu(pos[0]);
3865 auth_data->sae_status = le16_to_cpu(pos[1]);
3866 memcpy(auth_data->data, req->sae_data + 4,
3867 req->sae_data_len - 4);
3868 auth_data->data_len += req->sae_data_len - 4;
3869 }
3870
3871 if (req->ie && req->ie_len) {
3872 memcpy(&auth_data->data[auth_data->data_len],
3873 req->ie, req->ie_len);
3874 auth_data->data_len += req->ie_len;
3875 }
3876
3877 if (req->key && req->key_len) {
3878 auth_data->key_len = req->key_len;
3879 auth_data->key_idx = req->key_idx;
3880 memcpy(auth_data->key, req->key, req->key_len);
3881 }
3882
3883 auth_data->algorithm = auth_alg;
3884
3885 /* try to authenticate/probe */
3886
3887 mutex_lock(&ifmgd->mtx);
3888
3889 if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
3890 ifmgd->assoc_data) {
3891 err = -EBUSY;
3892 goto err_free;
3893 }
3894
3895 if (ifmgd->auth_data)
3896 ieee80211_destroy_auth_data(sdata, false);
3897
3898 /* prep auth_data so we don't go into idle on disassoc */
3899 ifmgd->auth_data = auth_data;
3900
3901 if (ifmgd->associated)
3902 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3903
3904 sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
3905
3906 err = ieee80211_prep_connection(sdata, req->bss, false);
3907 if (err)
3908 goto err_clear;
3909
3910 err = ieee80211_probe_auth(sdata);
3911 if (err) {
3912 sta_info_destroy_addr(sdata, req->bss->bssid);
3913 goto err_clear;
3914 }
3915
3916 /* hold our own reference */
3917 cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
3918 err = 0;
3919 goto out_unlock;
3920
3921 err_clear:
3922 memset(ifmgd->bssid, 0, ETH_ALEN);
3923 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
3924 ifmgd->auth_data = NULL;
3925 err_free:
3926 kfree(auth_data);
3927 out_unlock:
3928 mutex_unlock(&ifmgd->mtx);
3929
3930 return err;
3931 }
3932
3933 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
3934 struct cfg80211_assoc_request *req)
3935 {
3936 struct ieee80211_local *local = sdata->local;
3937 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3938 struct ieee80211_bss *bss = (void *)req->bss->priv;
3939 struct ieee80211_mgd_assoc_data *assoc_data;
3940 const struct cfg80211_bss_ies *beacon_ies;
3941 struct ieee80211_supported_band *sband;
3942 const u8 *ssidie, *ht_ie, *vht_ie;
3943 int i, err;
3944
3945 assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
3946 if (!assoc_data)
3947 return -ENOMEM;
3948
3949 rcu_read_lock();
3950 ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
3951 if (!ssidie) {
3952 rcu_read_unlock();
3953 kfree(assoc_data);
3954 return -EINVAL;
3955 }
3956 memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
3957 assoc_data->ssid_len = ssidie[1];
3958 rcu_read_unlock();
3959
3960 mutex_lock(&ifmgd->mtx);
3961
3962 if (ifmgd->associated)
3963 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3964
3965 if (ifmgd->auth_data && !ifmgd->auth_data->done) {
3966 err = -EBUSY;
3967 goto err_free;
3968 }
3969
3970 if (ifmgd->assoc_data) {
3971 err = -EBUSY;
3972 goto err_free;
3973 }
3974
3975 if (ifmgd->auth_data) {
3976 bool match;
3977
3978 /* keep sta info, bssid if matching */
3979 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
3980 ieee80211_destroy_auth_data(sdata, match);
3981 }
3982
3983 /* prepare assoc data */
3984
3985 ifmgd->beacon_crc_valid = false;
3986
3987 /*
3988 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
3989 * We still associate in non-HT mode (11a/b/g) if any one of these
3990 * ciphers is configured as pairwise.
3991 * We can set this to true for non-11n hardware, that'll be checked
3992 * separately along with the peer capabilities.
3993 */
3994 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
3995 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
3996 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
3997 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
3998 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3999 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4000 netdev_info(sdata->dev,
4001 "disabling HT/VHT due to WEP/TKIP use\n");
4002 }
4003 }
4004
4005 if (req->flags & ASSOC_REQ_DISABLE_HT) {
4006 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4007 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4008 }
4009
4010 if (req->flags & ASSOC_REQ_DISABLE_VHT)
4011 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4012
4013 /* Also disable HT if we don't support it or the AP doesn't use WMM */
4014 sband = local->hw.wiphy->bands[req->bss->channel->band];
4015 if (!sband->ht_cap.ht_supported ||
4016 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
4017 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4018 if (!bss->wmm_used)
4019 netdev_info(sdata->dev,
4020 "disabling HT as WMM/QoS is not supported by the AP\n");
4021 }
4022
4023 /* disable VHT if we don't support it or the AP doesn't use WMM */
4024 if (!sband->vht_cap.vht_supported ||
4025 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
4026 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4027 if (!bss->wmm_used)
4028 netdev_info(sdata->dev,
4029 "disabling VHT as WMM/QoS is not supported by the AP\n");
4030 }
4031
4032 memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4033 memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4034 sizeof(ifmgd->ht_capa_mask));
4035
4036 memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4037 memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4038 sizeof(ifmgd->vht_capa_mask));
4039
4040 if (req->ie && req->ie_len) {
4041 memcpy(assoc_data->ie, req->ie, req->ie_len);
4042 assoc_data->ie_len = req->ie_len;
4043 }
4044
4045 assoc_data->bss = req->bss;
4046
4047 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4048 if (ifmgd->powersave)
4049 sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4050 else
4051 sdata->smps_mode = IEEE80211_SMPS_OFF;
4052 } else
4053 sdata->smps_mode = ifmgd->req_smps;
4054
4055 assoc_data->capability = req->bss->capability;
4056 assoc_data->wmm = bss->wmm_used &&
4057 (local->hw.queues >= IEEE80211_NUM_ACS);
4058 assoc_data->supp_rates = bss->supp_rates;
4059 assoc_data->supp_rates_len = bss->supp_rates_len;
4060
4061 rcu_read_lock();
4062 ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4063 if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4064 assoc_data->ap_ht_param =
4065 ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4066 else
4067 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4068 vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4069 if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4070 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4071 sizeof(struct ieee80211_vht_cap));
4072 else
4073 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4074 rcu_read_unlock();
4075
4076 if (bss->wmm_used && bss->uapsd_supported &&
4077 (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
4078 assoc_data->uapsd = true;
4079 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4080 } else {
4081 assoc_data->uapsd = false;
4082 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4083 }
4084
4085 if (req->prev_bssid)
4086 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4087
4088 if (req->use_mfp) {
4089 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4090 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4091 } else {
4092 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4093 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4094 }
4095
4096 if (req->crypto.control_port)
4097 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4098 else
4099 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4100
4101 sdata->control_port_protocol = req->crypto.control_port_ethertype;
4102 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4103
4104 /* kick off associate process */
4105
4106 ifmgd->assoc_data = assoc_data;
4107 ifmgd->dtim_period = 0;
4108
4109 err = ieee80211_prep_connection(sdata, req->bss, true);
4110 if (err)
4111 goto err_clear;
4112
4113 rcu_read_lock();
4114 beacon_ies = rcu_dereference(req->bss->beacon_ies);
4115
4116 if (sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC &&
4117 !beacon_ies) {
4118 /*
4119 * Wait up to one beacon interval ...
4120 * should this be more if we miss one?
4121 */
4122 sdata_info(sdata, "waiting for beacon from %pM\n",
4123 ifmgd->bssid);
4124 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4125 assoc_data->timeout_started = true;
4126 assoc_data->need_beacon = true;
4127 } else if (beacon_ies) {
4128 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4129 beacon_ies->data,
4130 beacon_ies->len);
4131 u8 dtim_count = 0;
4132
4133 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4134 const struct ieee80211_tim_ie *tim;
4135 tim = (void *)(tim_ie + 2);
4136 ifmgd->dtim_period = tim->dtim_period;
4137 dtim_count = tim->dtim_count;
4138 }
4139 assoc_data->have_beacon = true;
4140 assoc_data->timeout = jiffies;
4141 assoc_data->timeout_started = true;
4142
4143 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
4144 sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4145 sdata->vif.bss_conf.sync_device_ts =
4146 bss->device_ts_beacon;
4147 sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4148 }
4149 } else {
4150 assoc_data->timeout = jiffies;
4151 assoc_data->timeout_started = true;
4152 }
4153 rcu_read_unlock();
4154
4155 run_again(ifmgd, assoc_data->timeout);
4156
4157 if (bss->corrupt_data) {
4158 char *corrupt_type = "data";
4159 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4160 if (bss->corrupt_data &
4161 IEEE80211_BSS_CORRUPT_PROBE_RESP)
4162 corrupt_type = "beacon and probe response";
4163 else
4164 corrupt_type = "beacon";
4165 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4166 corrupt_type = "probe response";
4167 sdata_info(sdata, "associating with AP with corrupt %s\n",
4168 corrupt_type);
4169 }
4170
4171 err = 0;
4172 goto out;
4173 err_clear:
4174 memset(ifmgd->bssid, 0, ETH_ALEN);
4175 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4176 ifmgd->assoc_data = NULL;
4177 err_free:
4178 kfree(assoc_data);
4179 out:
4180 mutex_unlock(&ifmgd->mtx);
4181
4182 return err;
4183 }
4184
4185 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4186 struct cfg80211_deauth_request *req)
4187 {
4188 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4189 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4190 bool tx = !req->local_state_change;
4191 bool sent_frame = false;
4192
4193 mutex_lock(&ifmgd->mtx);
4194
4195 sdata_info(sdata,
4196 "deauthenticating from %pM by local choice (reason=%d)\n",
4197 req->bssid, req->reason_code);
4198
4199 if (ifmgd->auth_data) {
4200 drv_mgd_prepare_tx(sdata->local, sdata);
4201 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4202 IEEE80211_STYPE_DEAUTH,
4203 req->reason_code, tx,
4204 frame_buf);
4205 ieee80211_destroy_auth_data(sdata, false);
4206 mutex_unlock(&ifmgd->mtx);
4207
4208 sent_frame = tx;
4209 goto out;
4210 }
4211
4212 if (ifmgd->associated &&
4213 ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4214 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4215 req->reason_code, tx, frame_buf);
4216 sent_frame = tx;
4217 }
4218 mutex_unlock(&ifmgd->mtx);
4219
4220 out:
4221 if (sent_frame)
4222 __cfg80211_send_deauth(sdata->dev, frame_buf,
4223 IEEE80211_DEAUTH_FRAME_LEN);
4224
4225 return 0;
4226 }
4227
4228 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4229 struct cfg80211_disassoc_request *req)
4230 {
4231 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4232 u8 bssid[ETH_ALEN];
4233 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4234
4235 mutex_lock(&ifmgd->mtx);
4236
4237 /*
4238 * cfg80211 should catch this ... but it's racy since
4239 * we can receive a disassoc frame, process it, hand it
4240 * to cfg80211 while that's in a locked section already
4241 * trying to tell us that the user wants to disconnect.
4242 */
4243 if (ifmgd->associated != req->bss) {
4244 mutex_unlock(&ifmgd->mtx);
4245 return -ENOLINK;
4246 }
4247
4248 sdata_info(sdata,
4249 "disassociating from %pM by local choice (reason=%d)\n",
4250 req->bss->bssid, req->reason_code);
4251
4252 memcpy(bssid, req->bss->bssid, ETH_ALEN);
4253 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
4254 req->reason_code, !req->local_state_change,
4255 frame_buf);
4256 mutex_unlock(&ifmgd->mtx);
4257
4258 __cfg80211_send_disassoc(sdata->dev, frame_buf,
4259 IEEE80211_DEAUTH_FRAME_LEN);
4260
4261 return 0;
4262 }
4263
4264 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4265 {
4266 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4267
4268 /*
4269 * Make sure some work items will not run after this,
4270 * they will not do anything but might not have been
4271 * cancelled when disconnecting.
4272 */
4273 cancel_work_sync(&ifmgd->monitor_work);
4274 cancel_work_sync(&ifmgd->beacon_connection_loss_work);
4275 cancel_work_sync(&ifmgd->request_smps_work);
4276 cancel_work_sync(&ifmgd->csa_connection_drop_work);
4277 cancel_work_sync(&ifmgd->chswitch_work);
4278
4279 mutex_lock(&ifmgd->mtx);
4280 if (ifmgd->assoc_data)
4281 ieee80211_destroy_assoc_data(sdata, false);
4282 if (ifmgd->auth_data)
4283 ieee80211_destroy_auth_data(sdata, false);
4284 del_timer_sync(&ifmgd->timer);
4285 mutex_unlock(&ifmgd->mtx);
4286 }
4287
4288 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
4289 enum nl80211_cqm_rssi_threshold_event rssi_event,
4290 gfp_t gfp)
4291 {
4292 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4293
4294 trace_api_cqm_rssi_notify(sdata, rssi_event);
4295
4296 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
4297 }
4298 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
Linux kernel - Deliverables
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