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Merge tag 'for-linus-v3.11-rc1' of git://oss.sgi.com/xfs/xfs
[mirror_ubuntu-bionic-kernel.git] / net / mac80211 / mlme.c
1 /*
2 * BSS client mode implementation
3 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4 * Copyright 2004, Instant802 Networks, Inc.
5 * Copyright 2005, Devicescape Software, Inc.
6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14 #include <linux/delay.h>
15 #include <linux/if_ether.h>
16 #include <linux/skbuff.h>
17 #include <linux/if_arp.h>
18 #include <linux/etherdevice.h>
19 #include <linux/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 /* also mark 40 MHz disabled */
293 ret |= IEEE80211_STA_DISABLE_40MHZ;
294 goto out;
295 }
296
297 if (!vht_oper || !sband->vht_cap.vht_supported) {
298 ret = IEEE80211_STA_DISABLE_VHT;
299 goto out;
300 }
301
302 vht_chandef.chan = channel;
303 vht_chandef.center_freq1 =
304 ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx,
305 channel->band);
306 vht_chandef.center_freq2 = 0;
307
308 switch (vht_oper->chan_width) {
309 case IEEE80211_VHT_CHANWIDTH_USE_HT:
310 vht_chandef.width = chandef->width;
311 break;
312 case IEEE80211_VHT_CHANWIDTH_80MHZ:
313 vht_chandef.width = NL80211_CHAN_WIDTH_80;
314 break;
315 case IEEE80211_VHT_CHANWIDTH_160MHZ:
316 vht_chandef.width = NL80211_CHAN_WIDTH_160;
317 break;
318 case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
319 vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
320 vht_chandef.center_freq2 =
321 ieee80211_channel_to_frequency(
322 vht_oper->center_freq_seg2_idx,
323 channel->band);
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
608 BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
609
610 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
611 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
612
613 /* determine capability flags */
614 cap = vht_cap.cap;
615
616 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
617 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ;
618 cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
619 }
620
621 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
622 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
623 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
624 }
625
626 /*
627 * Some APs apparently get confused if our capabilities are better
628 * than theirs, so restrict what we advertise in the assoc request.
629 */
630 if (!(ap_vht_cap->vht_cap_info &
631 cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
632 cap &= ~IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE;
633
634 /* reserve and fill IE */
635 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
636 ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
637 }
638
639 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
640 {
641 struct ieee80211_local *local = sdata->local;
642 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
643 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
644 struct sk_buff *skb;
645 struct ieee80211_mgmt *mgmt;
646 u8 *pos, qos_info;
647 size_t offset = 0, noffset;
648 int i, count, rates_len, supp_rates_len;
649 u16 capab;
650 struct ieee80211_supported_band *sband;
651 struct ieee80211_chanctx_conf *chanctx_conf;
652 struct ieee80211_channel *chan;
653 u32 rates = 0;
654
655 lockdep_assert_held(&ifmgd->mtx);
656
657 rcu_read_lock();
658 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
659 if (WARN_ON(!chanctx_conf)) {
660 rcu_read_unlock();
661 return;
662 }
663 chan = chanctx_conf->def.chan;
664 rcu_read_unlock();
665 sband = local->hw.wiphy->bands[chan->band];
666
667 if (assoc_data->supp_rates_len) {
668 /*
669 * Get all rates supported by the device and the AP as
670 * some APs don't like getting a superset of their rates
671 * in the association request (e.g. D-Link DAP 1353 in
672 * b-only mode)...
673 */
674 rates_len = ieee80211_compatible_rates(assoc_data->supp_rates,
675 assoc_data->supp_rates_len,
676 sband, &rates);
677 } else {
678 /*
679 * In case AP not provide any supported rates information
680 * before association, we send information element(s) with
681 * all rates that we support.
682 */
683 rates = ~0;
684 rates_len = sband->n_bitrates;
685 }
686
687 skb = alloc_skb(local->hw.extra_tx_headroom +
688 sizeof(*mgmt) + /* bit too much but doesn't matter */
689 2 + assoc_data->ssid_len + /* SSID */
690 4 + rates_len + /* (extended) rates */
691 4 + /* power capability */
692 2 + 2 * sband->n_channels + /* supported channels */
693 2 + sizeof(struct ieee80211_ht_cap) + /* HT */
694 2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
695 assoc_data->ie_len + /* extra IEs */
696 9, /* WMM */
697 GFP_KERNEL);
698 if (!skb)
699 return;
700
701 skb_reserve(skb, local->hw.extra_tx_headroom);
702
703 capab = WLAN_CAPABILITY_ESS;
704
705 if (sband->band == IEEE80211_BAND_2GHZ) {
706 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
707 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
708 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
709 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
710 }
711
712 if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
713 capab |= WLAN_CAPABILITY_PRIVACY;
714
715 if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
716 (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
717 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
718
719 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
720 memset(mgmt, 0, 24);
721 memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
722 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
723 memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
724
725 if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
726 skb_put(skb, 10);
727 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
728 IEEE80211_STYPE_REASSOC_REQ);
729 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
730 mgmt->u.reassoc_req.listen_interval =
731 cpu_to_le16(local->hw.conf.listen_interval);
732 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
733 ETH_ALEN);
734 } else {
735 skb_put(skb, 4);
736 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
737 IEEE80211_STYPE_ASSOC_REQ);
738 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
739 mgmt->u.assoc_req.listen_interval =
740 cpu_to_le16(local->hw.conf.listen_interval);
741 }
742
743 /* SSID */
744 pos = skb_put(skb, 2 + assoc_data->ssid_len);
745 *pos++ = WLAN_EID_SSID;
746 *pos++ = assoc_data->ssid_len;
747 memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
748
749 /* add all rates which were marked to be used above */
750 supp_rates_len = rates_len;
751 if (supp_rates_len > 8)
752 supp_rates_len = 8;
753
754 pos = skb_put(skb, supp_rates_len + 2);
755 *pos++ = WLAN_EID_SUPP_RATES;
756 *pos++ = supp_rates_len;
757
758 count = 0;
759 for (i = 0; i < sband->n_bitrates; i++) {
760 if (BIT(i) & rates) {
761 int rate = sband->bitrates[i].bitrate;
762 *pos++ = (u8) (rate / 5);
763 if (++count == 8)
764 break;
765 }
766 }
767
768 if (rates_len > count) {
769 pos = skb_put(skb, rates_len - count + 2);
770 *pos++ = WLAN_EID_EXT_SUPP_RATES;
771 *pos++ = rates_len - count;
772
773 for (i++; i < sband->n_bitrates; i++) {
774 if (BIT(i) & rates) {
775 int rate = sband->bitrates[i].bitrate;
776 *pos++ = (u8) (rate / 5);
777 }
778 }
779 }
780
781 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
782 /* 1. power capabilities */
783 pos = skb_put(skb, 4);
784 *pos++ = WLAN_EID_PWR_CAPABILITY;
785 *pos++ = 2;
786 *pos++ = 0; /* min tx power */
787 *pos++ = chan->max_power; /* max tx power */
788
789 /* 2. supported channels */
790 /* TODO: get this in reg domain format */
791 pos = skb_put(skb, 2 * sband->n_channels + 2);
792 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
793 *pos++ = 2 * sband->n_channels;
794 for (i = 0; i < sband->n_channels; i++) {
795 *pos++ = ieee80211_frequency_to_channel(
796 sband->channels[i].center_freq);
797 *pos++ = 1; /* one channel in the subband*/
798 }
799 }
800
801 /* if present, add any custom IEs that go before HT */
802 if (assoc_data->ie_len && assoc_data->ie) {
803 static const u8 before_ht[] = {
804 WLAN_EID_SSID,
805 WLAN_EID_SUPP_RATES,
806 WLAN_EID_EXT_SUPP_RATES,
807 WLAN_EID_PWR_CAPABILITY,
808 WLAN_EID_SUPPORTED_CHANNELS,
809 WLAN_EID_RSN,
810 WLAN_EID_QOS_CAPA,
811 WLAN_EID_RRM_ENABLED_CAPABILITIES,
812 WLAN_EID_MOBILITY_DOMAIN,
813 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
814 };
815 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
816 before_ht, ARRAY_SIZE(before_ht),
817 offset);
818 pos = skb_put(skb, noffset - offset);
819 memcpy(pos, assoc_data->ie + offset, noffset - offset);
820 offset = noffset;
821 }
822
823 if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
824 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
825 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
826
827 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
828 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
829 sband, chan, sdata->smps_mode);
830
831 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
832 ieee80211_add_vht_ie(sdata, skb, sband,
833 &assoc_data->ap_vht_cap);
834
835 /* if present, add any custom non-vendor IEs that go after HT */
836 if (assoc_data->ie_len && assoc_data->ie) {
837 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
838 assoc_data->ie_len,
839 offset);
840 pos = skb_put(skb, noffset - offset);
841 memcpy(pos, assoc_data->ie + offset, noffset - offset);
842 offset = noffset;
843 }
844
845 if (assoc_data->wmm) {
846 if (assoc_data->uapsd) {
847 qos_info = ifmgd->uapsd_queues;
848 qos_info |= (ifmgd->uapsd_max_sp_len <<
849 IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
850 } else {
851 qos_info = 0;
852 }
853
854 pos = skb_put(skb, 9);
855 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
856 *pos++ = 7; /* len */
857 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
858 *pos++ = 0x50;
859 *pos++ = 0xf2;
860 *pos++ = 2; /* WME */
861 *pos++ = 0; /* WME info */
862 *pos++ = 1; /* WME ver */
863 *pos++ = qos_info;
864 }
865
866 /* add any remaining custom (i.e. vendor specific here) IEs */
867 if (assoc_data->ie_len && assoc_data->ie) {
868 noffset = assoc_data->ie_len;
869 pos = skb_put(skb, noffset - offset);
870 memcpy(pos, assoc_data->ie + offset, noffset - offset);
871 }
872
873 drv_mgd_prepare_tx(local, sdata);
874
875 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
876 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
877 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
878 IEEE80211_TX_INTFL_MLME_CONN_TX;
879 ieee80211_tx_skb(sdata, skb);
880 }
881
882 void ieee80211_send_pspoll(struct ieee80211_local *local,
883 struct ieee80211_sub_if_data *sdata)
884 {
885 struct ieee80211_pspoll *pspoll;
886 struct sk_buff *skb;
887
888 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
889 if (!skb)
890 return;
891
892 pspoll = (struct ieee80211_pspoll *) skb->data;
893 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
894
895 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
896 ieee80211_tx_skb(sdata, skb);
897 }
898
899 void ieee80211_send_nullfunc(struct ieee80211_local *local,
900 struct ieee80211_sub_if_data *sdata,
901 int powersave)
902 {
903 struct sk_buff *skb;
904 struct ieee80211_hdr_3addr *nullfunc;
905 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
906
907 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
908 if (!skb)
909 return;
910
911 nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
912 if (powersave)
913 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
914
915 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
916 IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
917 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
918 IEEE80211_STA_CONNECTION_POLL))
919 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
920
921 ieee80211_tx_skb(sdata, skb);
922 }
923
924 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
925 struct ieee80211_sub_if_data *sdata)
926 {
927 struct sk_buff *skb;
928 struct ieee80211_hdr *nullfunc;
929 __le16 fc;
930
931 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
932 return;
933
934 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
935 if (!skb)
936 return;
937
938 skb_reserve(skb, local->hw.extra_tx_headroom);
939
940 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
941 memset(nullfunc, 0, 30);
942 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
943 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
944 nullfunc->frame_control = fc;
945 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
946 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
947 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
948 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
949
950 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
951 ieee80211_tx_skb(sdata, skb);
952 }
953
954 /* spectrum management related things */
955 static void ieee80211_chswitch_work(struct work_struct *work)
956 {
957 struct ieee80211_sub_if_data *sdata =
958 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
959 struct ieee80211_local *local = sdata->local;
960 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
961
962 if (!ieee80211_sdata_running(sdata))
963 return;
964
965 mutex_lock(&ifmgd->mtx);
966 if (!ifmgd->associated)
967 goto out;
968
969 local->_oper_chandef = local->csa_chandef;
970
971 if (!local->ops->channel_switch) {
972 /* call "hw_config" only if doing sw channel switch */
973 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
974 } else {
975 /* update the device channel directly */
976 local->hw.conf.chandef = local->_oper_chandef;
977 }
978
979 /* XXX: shouldn't really modify cfg80211-owned data! */
980 ifmgd->associated->channel = local->_oper_chandef.chan;
981
982 /* XXX: wait for a beacon first? */
983 ieee80211_wake_queues_by_reason(&local->hw,
984 IEEE80211_MAX_QUEUE_MAP,
985 IEEE80211_QUEUE_STOP_REASON_CSA);
986 out:
987 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
988 mutex_unlock(&ifmgd->mtx);
989 }
990
991 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
992 {
993 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
994 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
995
996 trace_api_chswitch_done(sdata, success);
997 if (!success) {
998 sdata_info(sdata,
999 "driver channel switch failed, disconnecting\n");
1000 ieee80211_queue_work(&sdata->local->hw,
1001 &ifmgd->csa_connection_drop_work);
1002 } else {
1003 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1004 }
1005 }
1006 EXPORT_SYMBOL(ieee80211_chswitch_done);
1007
1008 static void ieee80211_chswitch_timer(unsigned long data)
1009 {
1010 struct ieee80211_sub_if_data *sdata =
1011 (struct ieee80211_sub_if_data *) data;
1012
1013 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1014 }
1015
1016 static void
1017 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1018 u64 timestamp, struct ieee802_11_elems *elems,
1019 bool beacon)
1020 {
1021 struct ieee80211_local *local = sdata->local;
1022 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1023 struct cfg80211_bss *cbss = ifmgd->associated;
1024 struct ieee80211_bss *bss;
1025 struct ieee80211_chanctx *chanctx;
1026 enum ieee80211_band new_band;
1027 int new_freq;
1028 u8 new_chan_no;
1029 u8 count;
1030 u8 mode;
1031 struct ieee80211_channel *new_chan;
1032 struct cfg80211_chan_def new_chandef = {};
1033 struct cfg80211_chan_def new_vht_chandef = {};
1034 const struct ieee80211_sec_chan_offs_ie *sec_chan_offs;
1035 const struct ieee80211_wide_bw_chansw_ie *wide_bw_chansw_ie;
1036 const struct ieee80211_ht_operation *ht_oper;
1037 int secondary_channel_offset = -1;
1038
1039 ASSERT_MGD_MTX(ifmgd);
1040
1041 if (!cbss)
1042 return;
1043
1044 if (local->scanning)
1045 return;
1046
1047 /* disregard subsequent announcements if we are already processing */
1048 if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
1049 return;
1050
1051 sec_chan_offs = elems->sec_chan_offs;
1052 wide_bw_chansw_ie = elems->wide_bw_chansw_ie;
1053 ht_oper = elems->ht_operation;
1054
1055 if (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
1056 IEEE80211_STA_DISABLE_40MHZ)) {
1057 sec_chan_offs = NULL;
1058 wide_bw_chansw_ie = NULL;
1059 /* only used for bandwidth here */
1060 ht_oper = NULL;
1061 }
1062
1063 if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
1064 wide_bw_chansw_ie = NULL;
1065
1066 if (elems->ext_chansw_ie) {
1067 if (!ieee80211_operating_class_to_band(
1068 elems->ext_chansw_ie->new_operating_class,
1069 &new_band)) {
1070 sdata_info(sdata,
1071 "cannot understand ECSA IE operating class %d, disconnecting\n",
1072 elems->ext_chansw_ie->new_operating_class);
1073 ieee80211_queue_work(&local->hw,
1074 &ifmgd->csa_connection_drop_work);
1075 }
1076 new_chan_no = elems->ext_chansw_ie->new_ch_num;
1077 count = elems->ext_chansw_ie->count;
1078 mode = elems->ext_chansw_ie->mode;
1079 } else if (elems->ch_switch_ie) {
1080 new_band = cbss->channel->band;
1081 new_chan_no = elems->ch_switch_ie->new_ch_num;
1082 count = elems->ch_switch_ie->count;
1083 mode = elems->ch_switch_ie->mode;
1084 } else {
1085 /* nothing here we understand */
1086 return;
1087 }
1088
1089 bss = (void *)cbss->priv;
1090
1091 new_freq = ieee80211_channel_to_frequency(new_chan_no, new_band);
1092 new_chan = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
1093 if (!new_chan || new_chan->flags & IEEE80211_CHAN_DISABLED) {
1094 sdata_info(sdata,
1095 "AP %pM switches to unsupported channel (%d MHz), disconnecting\n",
1096 ifmgd->associated->bssid, new_freq);
1097 ieee80211_queue_work(&local->hw,
1098 &ifmgd->csa_connection_drop_work);
1099 return;
1100 }
1101
1102 if (!beacon && sec_chan_offs) {
1103 secondary_channel_offset = sec_chan_offs->sec_chan_offs;
1104 } else if (beacon && ht_oper) {
1105 secondary_channel_offset =
1106 ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET;
1107 } else if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
1108 /*
1109 * If it's not a beacon, HT is enabled and the IE not present,
1110 * it's 20 MHz, 802.11-2012 8.5.2.6:
1111 * This element [the Secondary Channel Offset Element] is
1112 * present when switching to a 40 MHz channel. It may be
1113 * present when switching to a 20 MHz channel (in which
1114 * case the secondary channel offset is set to SCN).
1115 */
1116 secondary_channel_offset = IEEE80211_HT_PARAM_CHA_SEC_NONE;
1117 }
1118
1119 switch (secondary_channel_offset) {
1120 default:
1121 /* secondary_channel_offset was present but is invalid */
1122 case IEEE80211_HT_PARAM_CHA_SEC_NONE:
1123 cfg80211_chandef_create(&new_chandef, new_chan,
1124 NL80211_CHAN_HT20);
1125 break;
1126 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1127 cfg80211_chandef_create(&new_chandef, new_chan,
1128 NL80211_CHAN_HT40PLUS);
1129 break;
1130 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1131 cfg80211_chandef_create(&new_chandef, new_chan,
1132 NL80211_CHAN_HT40MINUS);
1133 break;
1134 case -1:
1135 cfg80211_chandef_create(&new_chandef, new_chan,
1136 NL80211_CHAN_NO_HT);
1137 break;
1138 }
1139
1140 if (wide_bw_chansw_ie) {
1141 new_vht_chandef.chan = new_chan;
1142 new_vht_chandef.center_freq1 =
1143 ieee80211_channel_to_frequency(
1144 wide_bw_chansw_ie->new_center_freq_seg0,
1145 new_band);
1146
1147 switch (wide_bw_chansw_ie->new_channel_width) {
1148 default:
1149 /* hmmm, ignore VHT and use HT if present */
1150 case IEEE80211_VHT_CHANWIDTH_USE_HT:
1151 new_vht_chandef.chan = NULL;
1152 break;
1153 case IEEE80211_VHT_CHANWIDTH_80MHZ:
1154 new_vht_chandef.width = NL80211_CHAN_WIDTH_80;
1155 break;
1156 case IEEE80211_VHT_CHANWIDTH_160MHZ:
1157 new_vht_chandef.width = NL80211_CHAN_WIDTH_160;
1158 break;
1159 case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
1160 /* field is otherwise reserved */
1161 new_vht_chandef.center_freq2 =
1162 ieee80211_channel_to_frequency(
1163 wide_bw_chansw_ie->new_center_freq_seg1,
1164 new_band);
1165 new_vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
1166 break;
1167 }
1168 if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
1169 new_vht_chandef.width == NL80211_CHAN_WIDTH_80P80)
1170 chandef_downgrade(&new_vht_chandef);
1171 if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
1172 new_vht_chandef.width == NL80211_CHAN_WIDTH_160)
1173 chandef_downgrade(&new_vht_chandef);
1174 if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
1175 new_vht_chandef.width > NL80211_CHAN_WIDTH_20)
1176 chandef_downgrade(&new_vht_chandef);
1177 }
1178
1179 /* if VHT data is there validate & use it */
1180 if (new_vht_chandef.chan) {
1181 if (!cfg80211_chandef_compatible(&new_vht_chandef,
1182 &new_chandef)) {
1183 sdata_info(sdata,
1184 "AP %pM CSA has inconsistent channel data, disconnecting\n",
1185 ifmgd->associated->bssid);
1186 ieee80211_queue_work(&local->hw,
1187 &ifmgd->csa_connection_drop_work);
1188 return;
1189 }
1190 new_chandef = new_vht_chandef;
1191 }
1192
1193 if (!cfg80211_chandef_usable(local->hw.wiphy, &new_chandef,
1194 IEEE80211_CHAN_DISABLED)) {
1195 sdata_info(sdata,
1196 "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1197 ifmgd->associated->bssid, new_freq,
1198 new_chandef.width, new_chandef.center_freq1,
1199 new_chandef.center_freq2);
1200 ieee80211_queue_work(&local->hw,
1201 &ifmgd->csa_connection_drop_work);
1202 return;
1203 }
1204
1205 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
1206
1207 if (local->use_chanctx) {
1208 sdata_info(sdata,
1209 "not handling channel switch with channel contexts\n");
1210 ieee80211_queue_work(&local->hw,
1211 &ifmgd->csa_connection_drop_work);
1212 return;
1213 }
1214
1215 mutex_lock(&local->chanctx_mtx);
1216 if (WARN_ON(!rcu_access_pointer(sdata->vif.chanctx_conf))) {
1217 mutex_unlock(&local->chanctx_mtx);
1218 return;
1219 }
1220 chanctx = container_of(rcu_access_pointer(sdata->vif.chanctx_conf),
1221 struct ieee80211_chanctx, conf);
1222 if (chanctx->refcount > 1) {
1223 sdata_info(sdata,
1224 "channel switch with multiple interfaces on the same channel, disconnecting\n");
1225 ieee80211_queue_work(&local->hw,
1226 &ifmgd->csa_connection_drop_work);
1227 mutex_unlock(&local->chanctx_mtx);
1228 return;
1229 }
1230 mutex_unlock(&local->chanctx_mtx);
1231
1232 local->csa_chandef = new_chandef;
1233
1234 if (mode)
1235 ieee80211_stop_queues_by_reason(&local->hw,
1236 IEEE80211_MAX_QUEUE_MAP,
1237 IEEE80211_QUEUE_STOP_REASON_CSA);
1238
1239 if (local->ops->channel_switch) {
1240 /* use driver's channel switch callback */
1241 struct ieee80211_channel_switch ch_switch = {
1242 .timestamp = timestamp,
1243 .block_tx = mode,
1244 .chandef = new_chandef,
1245 .count = count,
1246 };
1247
1248 drv_channel_switch(local, &ch_switch);
1249 return;
1250 }
1251
1252 /* channel switch handled in software */
1253 if (count <= 1)
1254 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1255 else
1256 mod_timer(&ifmgd->chswitch_timer,
1257 TU_TO_EXP_TIME(count * cbss->beacon_interval));
1258 }
1259
1260 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1261 struct ieee80211_channel *channel,
1262 const u8 *country_ie, u8 country_ie_len,
1263 const u8 *pwr_constr_elem)
1264 {
1265 struct ieee80211_country_ie_triplet *triplet;
1266 int chan = ieee80211_frequency_to_channel(channel->center_freq);
1267 int i, chan_pwr, chan_increment, new_ap_level;
1268 bool have_chan_pwr = false;
1269
1270 /* Invalid IE */
1271 if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1272 return 0;
1273
1274 triplet = (void *)(country_ie + 3);
1275 country_ie_len -= 3;
1276
1277 switch (channel->band) {
1278 default:
1279 WARN_ON_ONCE(1);
1280 /* fall through */
1281 case IEEE80211_BAND_2GHZ:
1282 case IEEE80211_BAND_60GHZ:
1283 chan_increment = 1;
1284 break;
1285 case IEEE80211_BAND_5GHZ:
1286 chan_increment = 4;
1287 break;
1288 }
1289
1290 /* find channel */
1291 while (country_ie_len >= 3) {
1292 u8 first_channel = triplet->chans.first_channel;
1293
1294 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1295 goto next;
1296
1297 for (i = 0; i < triplet->chans.num_channels; i++) {
1298 if (first_channel + i * chan_increment == chan) {
1299 have_chan_pwr = true;
1300 chan_pwr = triplet->chans.max_power;
1301 break;
1302 }
1303 }
1304 if (have_chan_pwr)
1305 break;
1306
1307 next:
1308 triplet++;
1309 country_ie_len -= 3;
1310 }
1311
1312 if (!have_chan_pwr)
1313 return 0;
1314
1315 new_ap_level = max_t(int, 0, chan_pwr - *pwr_constr_elem);
1316
1317 if (sdata->ap_power_level == new_ap_level)
1318 return 0;
1319
1320 sdata_info(sdata,
1321 "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1322 new_ap_level, chan_pwr, *pwr_constr_elem,
1323 sdata->u.mgd.bssid);
1324 sdata->ap_power_level = new_ap_level;
1325 if (__ieee80211_recalc_txpower(sdata))
1326 return BSS_CHANGED_TXPOWER;
1327 return 0;
1328 }
1329
1330 /* powersave */
1331 static void ieee80211_enable_ps(struct ieee80211_local *local,
1332 struct ieee80211_sub_if_data *sdata)
1333 {
1334 struct ieee80211_conf *conf = &local->hw.conf;
1335
1336 /*
1337 * If we are scanning right now then the parameters will
1338 * take effect when scan finishes.
1339 */
1340 if (local->scanning)
1341 return;
1342
1343 if (conf->dynamic_ps_timeout > 0 &&
1344 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
1345 mod_timer(&local->dynamic_ps_timer, jiffies +
1346 msecs_to_jiffies(conf->dynamic_ps_timeout));
1347 } else {
1348 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1349 ieee80211_send_nullfunc(local, sdata, 1);
1350
1351 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1352 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
1353 return;
1354
1355 conf->flags |= IEEE80211_CONF_PS;
1356 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1357 }
1358 }
1359
1360 static void ieee80211_change_ps(struct ieee80211_local *local)
1361 {
1362 struct ieee80211_conf *conf = &local->hw.conf;
1363
1364 if (local->ps_sdata) {
1365 ieee80211_enable_ps(local, local->ps_sdata);
1366 } else if (conf->flags & IEEE80211_CONF_PS) {
1367 conf->flags &= ~IEEE80211_CONF_PS;
1368 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1369 del_timer_sync(&local->dynamic_ps_timer);
1370 cancel_work_sync(&local->dynamic_ps_enable_work);
1371 }
1372 }
1373
1374 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1375 {
1376 struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1377 struct sta_info *sta = NULL;
1378 bool authorized = false;
1379
1380 if (!mgd->powersave)
1381 return false;
1382
1383 if (mgd->broken_ap)
1384 return false;
1385
1386 if (!mgd->associated)
1387 return false;
1388
1389 if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
1390 IEEE80211_STA_CONNECTION_POLL))
1391 return false;
1392
1393 rcu_read_lock();
1394 sta = sta_info_get(sdata, mgd->bssid);
1395 if (sta)
1396 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1397 rcu_read_unlock();
1398
1399 return authorized;
1400 }
1401
1402 /* need to hold RTNL or interface lock */
1403 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1404 {
1405 struct ieee80211_sub_if_data *sdata, *found = NULL;
1406 int count = 0;
1407 int timeout;
1408
1409 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
1410 local->ps_sdata = NULL;
1411 return;
1412 }
1413
1414 list_for_each_entry(sdata, &local->interfaces, list) {
1415 if (!ieee80211_sdata_running(sdata))
1416 continue;
1417 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1418 /* If an AP vif is found, then disable PS
1419 * by setting the count to zero thereby setting
1420 * ps_sdata to NULL.
1421 */
1422 count = 0;
1423 break;
1424 }
1425 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1426 continue;
1427 found = sdata;
1428 count++;
1429 }
1430
1431 if (count == 1 && ieee80211_powersave_allowed(found)) {
1432 s32 beaconint_us;
1433
1434 if (latency < 0)
1435 latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1436
1437 beaconint_us = ieee80211_tu_to_usec(
1438 found->vif.bss_conf.beacon_int);
1439
1440 timeout = local->dynamic_ps_forced_timeout;
1441 if (timeout < 0) {
1442 /*
1443 * Go to full PSM if the user configures a very low
1444 * latency requirement.
1445 * The 2000 second value is there for compatibility
1446 * until the PM_QOS_NETWORK_LATENCY is configured
1447 * with real values.
1448 */
1449 if (latency > (1900 * USEC_PER_MSEC) &&
1450 latency != (2000 * USEC_PER_SEC))
1451 timeout = 0;
1452 else
1453 timeout = 100;
1454 }
1455 local->hw.conf.dynamic_ps_timeout = timeout;
1456
1457 if (beaconint_us > latency) {
1458 local->ps_sdata = NULL;
1459 } else {
1460 int maxslp = 1;
1461 u8 dtimper = found->u.mgd.dtim_period;
1462
1463 /* If the TIM IE is invalid, pretend the value is 1 */
1464 if (!dtimper)
1465 dtimper = 1;
1466 else if (dtimper > 1)
1467 maxslp = min_t(int, dtimper,
1468 latency / beaconint_us);
1469
1470 local->hw.conf.max_sleep_period = maxslp;
1471 local->hw.conf.ps_dtim_period = dtimper;
1472 local->ps_sdata = found;
1473 }
1474 } else {
1475 local->ps_sdata = NULL;
1476 }
1477
1478 ieee80211_change_ps(local);
1479 }
1480
1481 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1482 {
1483 bool ps_allowed = ieee80211_powersave_allowed(sdata);
1484
1485 if (sdata->vif.bss_conf.ps != ps_allowed) {
1486 sdata->vif.bss_conf.ps = ps_allowed;
1487 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1488 }
1489 }
1490
1491 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1492 {
1493 struct ieee80211_local *local =
1494 container_of(work, struct ieee80211_local,
1495 dynamic_ps_disable_work);
1496
1497 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1498 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1499 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1500 }
1501
1502 ieee80211_wake_queues_by_reason(&local->hw,
1503 IEEE80211_MAX_QUEUE_MAP,
1504 IEEE80211_QUEUE_STOP_REASON_PS);
1505 }
1506
1507 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1508 {
1509 struct ieee80211_local *local =
1510 container_of(work, struct ieee80211_local,
1511 dynamic_ps_enable_work);
1512 struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1513 struct ieee80211_if_managed *ifmgd;
1514 unsigned long flags;
1515 int q;
1516
1517 /* can only happen when PS was just disabled anyway */
1518 if (!sdata)
1519 return;
1520
1521 ifmgd = &sdata->u.mgd;
1522
1523 if (local->hw.conf.flags & IEEE80211_CONF_PS)
1524 return;
1525
1526 if (local->hw.conf.dynamic_ps_timeout > 0) {
1527 /* don't enter PS if TX frames are pending */
1528 if (drv_tx_frames_pending(local)) {
1529 mod_timer(&local->dynamic_ps_timer, jiffies +
1530 msecs_to_jiffies(
1531 local->hw.conf.dynamic_ps_timeout));
1532 return;
1533 }
1534
1535 /*
1536 * transmission can be stopped by others which leads to
1537 * dynamic_ps_timer expiry. Postpone the ps timer if it
1538 * is not the actual idle state.
1539 */
1540 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1541 for (q = 0; q < local->hw.queues; q++) {
1542 if (local->queue_stop_reasons[q]) {
1543 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1544 flags);
1545 mod_timer(&local->dynamic_ps_timer, jiffies +
1546 msecs_to_jiffies(
1547 local->hw.conf.dynamic_ps_timeout));
1548 return;
1549 }
1550 }
1551 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1552 }
1553
1554 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1555 !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1556 if (drv_tx_frames_pending(local)) {
1557 mod_timer(&local->dynamic_ps_timer, jiffies +
1558 msecs_to_jiffies(
1559 local->hw.conf.dynamic_ps_timeout));
1560 } else {
1561 ieee80211_send_nullfunc(local, sdata, 1);
1562 /* Flush to get the tx status of nullfunc frame */
1563 ieee80211_flush_queues(local, sdata);
1564 }
1565 }
1566
1567 if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1568 (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1569 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1570 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1571 local->hw.conf.flags |= IEEE80211_CONF_PS;
1572 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1573 }
1574 }
1575
1576 void ieee80211_dynamic_ps_timer(unsigned long data)
1577 {
1578 struct ieee80211_local *local = (void *) data;
1579
1580 if (local->quiescing || local->suspended)
1581 return;
1582
1583 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1584 }
1585
1586 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1587 {
1588 struct delayed_work *delayed_work =
1589 container_of(work, struct delayed_work, work);
1590 struct ieee80211_sub_if_data *sdata =
1591 container_of(delayed_work, struct ieee80211_sub_if_data,
1592 dfs_cac_timer_work);
1593
1594 ieee80211_vif_release_channel(sdata);
1595
1596 cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_FINISHED, GFP_KERNEL);
1597 }
1598
1599 /* MLME */
1600 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1601 struct ieee80211_sub_if_data *sdata,
1602 const u8 *wmm_param, size_t wmm_param_len)
1603 {
1604 struct ieee80211_tx_queue_params params;
1605 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1606 size_t left;
1607 int count;
1608 const u8 *pos;
1609 u8 uapsd_queues = 0;
1610
1611 if (!local->ops->conf_tx)
1612 return false;
1613
1614 if (local->hw.queues < IEEE80211_NUM_ACS)
1615 return false;
1616
1617 if (!wmm_param)
1618 return false;
1619
1620 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1621 return false;
1622
1623 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1624 uapsd_queues = ifmgd->uapsd_queues;
1625
1626 count = wmm_param[6] & 0x0f;
1627 if (count == ifmgd->wmm_last_param_set)
1628 return false;
1629 ifmgd->wmm_last_param_set = count;
1630
1631 pos = wmm_param + 8;
1632 left = wmm_param_len - 8;
1633
1634 memset(&params, 0, sizeof(params));
1635
1636 sdata->wmm_acm = 0;
1637 for (; left >= 4; left -= 4, pos += 4) {
1638 int aci = (pos[0] >> 5) & 0x03;
1639 int acm = (pos[0] >> 4) & 0x01;
1640 bool uapsd = false;
1641 int queue;
1642
1643 switch (aci) {
1644 case 1: /* AC_BK */
1645 queue = 3;
1646 if (acm)
1647 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1648 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1649 uapsd = true;
1650 break;
1651 case 2: /* AC_VI */
1652 queue = 1;
1653 if (acm)
1654 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1655 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1656 uapsd = true;
1657 break;
1658 case 3: /* AC_VO */
1659 queue = 0;
1660 if (acm)
1661 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1662 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1663 uapsd = true;
1664 break;
1665 case 0: /* AC_BE */
1666 default:
1667 queue = 2;
1668 if (acm)
1669 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1670 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1671 uapsd = true;
1672 break;
1673 }
1674
1675 params.aifs = pos[0] & 0x0f;
1676 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1677 params.cw_min = ecw2cw(pos[1] & 0x0f);
1678 params.txop = get_unaligned_le16(pos + 2);
1679 params.acm = acm;
1680 params.uapsd = uapsd;
1681
1682 mlme_dbg(sdata,
1683 "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1684 queue, aci, acm,
1685 params.aifs, params.cw_min, params.cw_max,
1686 params.txop, params.uapsd);
1687 sdata->tx_conf[queue] = params;
1688 if (drv_conf_tx(local, sdata, queue, &params))
1689 sdata_err(sdata,
1690 "failed to set TX queue parameters for queue %d\n",
1691 queue);
1692 }
1693
1694 /* enable WMM or activate new settings */
1695 sdata->vif.bss_conf.qos = true;
1696 return true;
1697 }
1698
1699 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1700 {
1701 lockdep_assert_held(&sdata->local->mtx);
1702
1703 sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1704 IEEE80211_STA_BEACON_POLL);
1705 ieee80211_run_deferred_scan(sdata->local);
1706 }
1707
1708 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1709 {
1710 mutex_lock(&sdata->local->mtx);
1711 __ieee80211_stop_poll(sdata);
1712 mutex_unlock(&sdata->local->mtx);
1713 }
1714
1715 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1716 u16 capab, bool erp_valid, u8 erp)
1717 {
1718 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1719 u32 changed = 0;
1720 bool use_protection;
1721 bool use_short_preamble;
1722 bool use_short_slot;
1723
1724 if (erp_valid) {
1725 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1726 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1727 } else {
1728 use_protection = false;
1729 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1730 }
1731
1732 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1733 if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1734 use_short_slot = true;
1735
1736 if (use_protection != bss_conf->use_cts_prot) {
1737 bss_conf->use_cts_prot = use_protection;
1738 changed |= BSS_CHANGED_ERP_CTS_PROT;
1739 }
1740
1741 if (use_short_preamble != bss_conf->use_short_preamble) {
1742 bss_conf->use_short_preamble = use_short_preamble;
1743 changed |= BSS_CHANGED_ERP_PREAMBLE;
1744 }
1745
1746 if (use_short_slot != bss_conf->use_short_slot) {
1747 bss_conf->use_short_slot = use_short_slot;
1748 changed |= BSS_CHANGED_ERP_SLOT;
1749 }
1750
1751 return changed;
1752 }
1753
1754 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1755 struct cfg80211_bss *cbss,
1756 u32 bss_info_changed)
1757 {
1758 struct ieee80211_bss *bss = (void *)cbss->priv;
1759 struct ieee80211_local *local = sdata->local;
1760 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1761
1762 bss_info_changed |= BSS_CHANGED_ASSOC;
1763 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1764 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1765
1766 sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1767 beacon_loss_count * bss_conf->beacon_int));
1768
1769 sdata->u.mgd.associated = cbss;
1770 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1771
1772 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1773
1774 if (sdata->vif.p2p) {
1775 const struct cfg80211_bss_ies *ies;
1776
1777 rcu_read_lock();
1778 ies = rcu_dereference(cbss->ies);
1779 if (ies) {
1780 int ret;
1781
1782 ret = cfg80211_get_p2p_attr(
1783 ies->data, ies->len,
1784 IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1785 (u8 *) &bss_conf->p2p_noa_attr,
1786 sizeof(bss_conf->p2p_noa_attr));
1787 if (ret >= 2) {
1788 sdata->u.mgd.p2p_noa_index =
1789 bss_conf->p2p_noa_attr.index;
1790 bss_info_changed |= BSS_CHANGED_P2P_PS;
1791 }
1792 }
1793 rcu_read_unlock();
1794 }
1795
1796 /* just to be sure */
1797 ieee80211_stop_poll(sdata);
1798
1799 ieee80211_led_assoc(local, 1);
1800
1801 if (sdata->u.mgd.assoc_data->have_beacon) {
1802 /*
1803 * If the AP is buggy we may get here with no DTIM period
1804 * known, so assume it's 1 which is the only safe assumption
1805 * in that case, although if the TIM IE is broken powersave
1806 * probably just won't work at all.
1807 */
1808 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1809 bss_info_changed |= BSS_CHANGED_DTIM_PERIOD;
1810 } else {
1811 bss_conf->dtim_period = 0;
1812 }
1813
1814 bss_conf->assoc = 1;
1815
1816 /* Tell the driver to monitor connection quality (if supported) */
1817 if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1818 bss_conf->cqm_rssi_thold)
1819 bss_info_changed |= BSS_CHANGED_CQM;
1820
1821 /* Enable ARP filtering */
1822 if (bss_conf->arp_addr_cnt)
1823 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1824
1825 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1826
1827 mutex_lock(&local->iflist_mtx);
1828 ieee80211_recalc_ps(local, -1);
1829 mutex_unlock(&local->iflist_mtx);
1830
1831 ieee80211_recalc_smps(sdata);
1832 ieee80211_recalc_ps_vif(sdata);
1833
1834 netif_carrier_on(sdata->dev);
1835 }
1836
1837 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1838 u16 stype, u16 reason, bool tx,
1839 u8 *frame_buf)
1840 {
1841 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1842 struct ieee80211_local *local = sdata->local;
1843 u32 changed = 0;
1844
1845 ASSERT_MGD_MTX(ifmgd);
1846
1847 if (WARN_ON_ONCE(tx && !frame_buf))
1848 return;
1849
1850 if (WARN_ON(!ifmgd->associated))
1851 return;
1852
1853 ieee80211_stop_poll(sdata);
1854
1855 ifmgd->associated = NULL;
1856 netif_carrier_off(sdata->dev);
1857
1858 /*
1859 * if we want to get out of ps before disassoc (why?) we have
1860 * to do it before sending disassoc, as otherwise the null-packet
1861 * won't be valid.
1862 */
1863 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1864 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1865 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1866 }
1867 local->ps_sdata = NULL;
1868
1869 /* disable per-vif ps */
1870 ieee80211_recalc_ps_vif(sdata);
1871
1872 /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
1873 if (tx)
1874 ieee80211_flush_queues(local, sdata);
1875
1876 /* deauthenticate/disassociate now */
1877 if (tx || frame_buf)
1878 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
1879 reason, tx, frame_buf);
1880
1881 /* flush out frame */
1882 if (tx)
1883 ieee80211_flush_queues(local, sdata);
1884
1885 /* clear bssid only after building the needed mgmt frames */
1886 memset(ifmgd->bssid, 0, ETH_ALEN);
1887
1888 /* remove AP and TDLS peers */
1889 sta_info_flush_defer(sdata);
1890
1891 /* finally reset all BSS / config parameters */
1892 changed |= ieee80211_reset_erp_info(sdata);
1893
1894 ieee80211_led_assoc(local, 0);
1895 changed |= BSS_CHANGED_ASSOC;
1896 sdata->vif.bss_conf.assoc = false;
1897
1898 ifmgd->p2p_noa_index = -1;
1899 memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
1900 sizeof(sdata->vif.bss_conf.p2p_noa_attr));
1901
1902 /* on the next assoc, re-program HT/VHT parameters */
1903 memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1904 memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1905 memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
1906 memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
1907
1908 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1909
1910 del_timer_sync(&local->dynamic_ps_timer);
1911 cancel_work_sync(&local->dynamic_ps_enable_work);
1912
1913 /* Disable ARP filtering */
1914 if (sdata->vif.bss_conf.arp_addr_cnt)
1915 changed |= BSS_CHANGED_ARP_FILTER;
1916
1917 sdata->vif.bss_conf.qos = false;
1918 changed |= BSS_CHANGED_QOS;
1919
1920 /* The BSSID (not really interesting) and HT changed */
1921 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1922 ieee80211_bss_info_change_notify(sdata, changed);
1923
1924 /* disassociated - set to defaults now */
1925 ieee80211_set_wmm_default(sdata, false);
1926
1927 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1928 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1929 del_timer_sync(&sdata->u.mgd.timer);
1930 del_timer_sync(&sdata->u.mgd.chswitch_timer);
1931
1932 sdata->vif.bss_conf.dtim_period = 0;
1933
1934 ifmgd->flags = 0;
1935 ieee80211_vif_release_channel(sdata);
1936 }
1937
1938 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1939 struct ieee80211_hdr *hdr)
1940 {
1941 /*
1942 * We can postpone the mgd.timer whenever receiving unicast frames
1943 * from AP because we know that the connection is working both ways
1944 * at that time. But multicast frames (and hence also beacons) must
1945 * be ignored here, because we need to trigger the timer during
1946 * data idle periods for sending the periodic probe request to the
1947 * AP we're connected to.
1948 */
1949 if (is_multicast_ether_addr(hdr->addr1))
1950 return;
1951
1952 ieee80211_sta_reset_conn_monitor(sdata);
1953 }
1954
1955 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1956 {
1957 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1958 struct ieee80211_local *local = sdata->local;
1959
1960 mutex_lock(&local->mtx);
1961 if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1962 IEEE80211_STA_CONNECTION_POLL))) {
1963 mutex_unlock(&local->mtx);
1964 return;
1965 }
1966
1967 __ieee80211_stop_poll(sdata);
1968
1969 mutex_lock(&local->iflist_mtx);
1970 ieee80211_recalc_ps(local, -1);
1971 mutex_unlock(&local->iflist_mtx);
1972
1973 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1974 goto out;
1975
1976 /*
1977 * We've received a probe response, but are not sure whether
1978 * we have or will be receiving any beacons or data, so let's
1979 * schedule the timers again, just in case.
1980 */
1981 ieee80211_sta_reset_beacon_monitor(sdata);
1982
1983 mod_timer(&ifmgd->conn_mon_timer,
1984 round_jiffies_up(jiffies +
1985 IEEE80211_CONNECTION_IDLE_TIME));
1986 out:
1987 mutex_unlock(&local->mtx);
1988 }
1989
1990 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1991 struct ieee80211_hdr *hdr, bool ack)
1992 {
1993 if (!ieee80211_is_data(hdr->frame_control))
1994 return;
1995
1996 if (ieee80211_is_nullfunc(hdr->frame_control) &&
1997 sdata->u.mgd.probe_send_count > 0) {
1998 if (ack)
1999 ieee80211_sta_reset_conn_monitor(sdata);
2000 else
2001 sdata->u.mgd.nullfunc_failed = true;
2002 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2003 return;
2004 }
2005
2006 if (ack)
2007 ieee80211_sta_reset_conn_monitor(sdata);
2008 }
2009
2010 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
2011 {
2012 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2013 const u8 *ssid;
2014 u8 *dst = ifmgd->associated->bssid;
2015 u8 unicast_limit = max(1, max_probe_tries - 3);
2016
2017 /*
2018 * Try sending broadcast probe requests for the last three
2019 * probe requests after the first ones failed since some
2020 * buggy APs only support broadcast probe requests.
2021 */
2022 if (ifmgd->probe_send_count >= unicast_limit)
2023 dst = NULL;
2024
2025 /*
2026 * When the hardware reports an accurate Tx ACK status, it's
2027 * better to send a nullfunc frame instead of a probe request,
2028 * as it will kick us off the AP quickly if we aren't associated
2029 * anymore. The timeout will be reset if the frame is ACKed by
2030 * the AP.
2031 */
2032 ifmgd->probe_send_count++;
2033
2034 if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2035 ifmgd->nullfunc_failed = false;
2036 ieee80211_send_nullfunc(sdata->local, sdata, 0);
2037 } else {
2038 int ssid_len;
2039
2040 rcu_read_lock();
2041 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2042 if (WARN_ON_ONCE(ssid == NULL))
2043 ssid_len = 0;
2044 else
2045 ssid_len = ssid[1];
2046
2047 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
2048 0, (u32) -1, true, 0,
2049 ifmgd->associated->channel, false);
2050 rcu_read_unlock();
2051 }
2052
2053 ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2054 run_again(ifmgd, ifmgd->probe_timeout);
2055 if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2056 ieee80211_flush_queues(sdata->local, sdata);
2057 }
2058
2059 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
2060 bool beacon)
2061 {
2062 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2063 bool already = false;
2064
2065 if (!ieee80211_sdata_running(sdata))
2066 return;
2067
2068 mutex_lock(&ifmgd->mtx);
2069
2070 if (!ifmgd->associated)
2071 goto out;
2072
2073 mutex_lock(&sdata->local->mtx);
2074
2075 if (sdata->local->tmp_channel || sdata->local->scanning) {
2076 mutex_unlock(&sdata->local->mtx);
2077 goto out;
2078 }
2079
2080 if (beacon) {
2081 mlme_dbg_ratelimited(sdata,
2082 "detected beacon loss from AP (missed %d beacons) - probing\n",
2083 beacon_loss_count);
2084
2085 ieee80211_cqm_rssi_notify(&sdata->vif,
2086 NL80211_CQM_RSSI_BEACON_LOSS_EVENT,
2087 GFP_KERNEL);
2088 }
2089
2090 /*
2091 * The driver/our work has already reported this event or the
2092 * connection monitoring has kicked in and we have already sent
2093 * a probe request. Or maybe the AP died and the driver keeps
2094 * reporting until we disassociate...
2095 *
2096 * In either case we have to ignore the current call to this
2097 * function (except for setting the correct probe reason bit)
2098 * because otherwise we would reset the timer every time and
2099 * never check whether we received a probe response!
2100 */
2101 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2102 IEEE80211_STA_CONNECTION_POLL))
2103 already = true;
2104
2105 if (beacon)
2106 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
2107 else
2108 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2109
2110 mutex_unlock(&sdata->local->mtx);
2111
2112 if (already)
2113 goto out;
2114
2115 mutex_lock(&sdata->local->iflist_mtx);
2116 ieee80211_recalc_ps(sdata->local, -1);
2117 mutex_unlock(&sdata->local->iflist_mtx);
2118
2119 ifmgd->probe_send_count = 0;
2120 ieee80211_mgd_probe_ap_send(sdata);
2121 out:
2122 mutex_unlock(&ifmgd->mtx);
2123 }
2124
2125 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2126 struct ieee80211_vif *vif)
2127 {
2128 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2129 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2130 struct cfg80211_bss *cbss;
2131 struct sk_buff *skb;
2132 const u8 *ssid;
2133 int ssid_len;
2134
2135 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2136 return NULL;
2137
2138 ASSERT_MGD_MTX(ifmgd);
2139
2140 if (ifmgd->associated)
2141 cbss = ifmgd->associated;
2142 else if (ifmgd->auth_data)
2143 cbss = ifmgd->auth_data->bss;
2144 else if (ifmgd->assoc_data)
2145 cbss = ifmgd->assoc_data->bss;
2146 else
2147 return NULL;
2148
2149 rcu_read_lock();
2150 ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2151 if (WARN_ON_ONCE(ssid == NULL))
2152 ssid_len = 0;
2153 else
2154 ssid_len = ssid[1];
2155
2156 skb = ieee80211_build_probe_req(sdata, cbss->bssid,
2157 (u32) -1, cbss->channel,
2158 ssid + 2, ssid_len,
2159 NULL, 0, true);
2160 rcu_read_unlock();
2161
2162 return skb;
2163 }
2164 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2165
2166 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2167 {
2168 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2169 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2170
2171 mutex_lock(&ifmgd->mtx);
2172 if (!ifmgd->associated) {
2173 mutex_unlock(&ifmgd->mtx);
2174 return;
2175 }
2176
2177 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2178 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2179 true, frame_buf);
2180 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
2181 ieee80211_wake_queues_by_reason(&sdata->local->hw,
2182 IEEE80211_MAX_QUEUE_MAP,
2183 IEEE80211_QUEUE_STOP_REASON_CSA);
2184 mutex_unlock(&ifmgd->mtx);
2185
2186 /*
2187 * must be outside lock due to cfg80211,
2188 * but that's not a problem.
2189 */
2190 cfg80211_send_deauth(sdata->dev, frame_buf, IEEE80211_DEAUTH_FRAME_LEN);
2191 }
2192
2193 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2194 {
2195 struct ieee80211_sub_if_data *sdata =
2196 container_of(work, struct ieee80211_sub_if_data,
2197 u.mgd.beacon_connection_loss_work);
2198 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2199 struct sta_info *sta;
2200
2201 if (ifmgd->associated) {
2202 rcu_read_lock();
2203 sta = sta_info_get(sdata, ifmgd->bssid);
2204 if (sta)
2205 sta->beacon_loss_count++;
2206 rcu_read_unlock();
2207 }
2208
2209 if (ifmgd->connection_loss) {
2210 sdata_info(sdata, "Connection to AP %pM lost\n",
2211 ifmgd->bssid);
2212 __ieee80211_disconnect(sdata);
2213 } else {
2214 ieee80211_mgd_probe_ap(sdata, true);
2215 }
2216 }
2217
2218 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2219 {
2220 struct ieee80211_sub_if_data *sdata =
2221 container_of(work, struct ieee80211_sub_if_data,
2222 u.mgd.csa_connection_drop_work);
2223
2224 __ieee80211_disconnect(sdata);
2225 }
2226
2227 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2228 {
2229 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2230 struct ieee80211_hw *hw = &sdata->local->hw;
2231
2232 trace_api_beacon_loss(sdata);
2233
2234 sdata->u.mgd.connection_loss = false;
2235 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2236 }
2237 EXPORT_SYMBOL(ieee80211_beacon_loss);
2238
2239 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2240 {
2241 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2242 struct ieee80211_hw *hw = &sdata->local->hw;
2243
2244 trace_api_connection_loss(sdata);
2245
2246 sdata->u.mgd.connection_loss = true;
2247 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2248 }
2249 EXPORT_SYMBOL(ieee80211_connection_loss);
2250
2251
2252 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2253 bool assoc)
2254 {
2255 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2256
2257 lockdep_assert_held(&sdata->u.mgd.mtx);
2258
2259 if (!assoc) {
2260 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2261
2262 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2263 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2264 sdata->u.mgd.flags = 0;
2265 ieee80211_vif_release_channel(sdata);
2266 }
2267
2268 cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2269 kfree(auth_data);
2270 sdata->u.mgd.auth_data = NULL;
2271 }
2272
2273 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2274 struct ieee80211_mgmt *mgmt, size_t len)
2275 {
2276 struct ieee80211_local *local = sdata->local;
2277 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2278 u8 *pos;
2279 struct ieee802_11_elems elems;
2280 u32 tx_flags = 0;
2281
2282 pos = mgmt->u.auth.variable;
2283 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2284 if (!elems.challenge)
2285 return;
2286 auth_data->expected_transaction = 4;
2287 drv_mgd_prepare_tx(sdata->local, sdata);
2288 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2289 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2290 IEEE80211_TX_INTFL_MLME_CONN_TX;
2291 ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2292 elems.challenge - 2, elems.challenge_len + 2,
2293 auth_data->bss->bssid, auth_data->bss->bssid,
2294 auth_data->key, auth_data->key_len,
2295 auth_data->key_idx, tx_flags);
2296 }
2297
2298 static enum rx_mgmt_action __must_check
2299 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2300 struct ieee80211_mgmt *mgmt, size_t len)
2301 {
2302 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2303 u8 bssid[ETH_ALEN];
2304 u16 auth_alg, auth_transaction, status_code;
2305 struct sta_info *sta;
2306
2307 lockdep_assert_held(&ifmgd->mtx);
2308
2309 if (len < 24 + 6)
2310 return RX_MGMT_NONE;
2311
2312 if (!ifmgd->auth_data || ifmgd->auth_data->done)
2313 return RX_MGMT_NONE;
2314
2315 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2316
2317 if (!ether_addr_equal(bssid, mgmt->bssid))
2318 return RX_MGMT_NONE;
2319
2320 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2321 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2322 status_code = le16_to_cpu(mgmt->u.auth.status_code);
2323
2324 if (auth_alg != ifmgd->auth_data->algorithm ||
2325 auth_transaction != ifmgd->auth_data->expected_transaction) {
2326 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2327 mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2328 auth_transaction,
2329 ifmgd->auth_data->expected_transaction);
2330 return RX_MGMT_NONE;
2331 }
2332
2333 if (status_code != WLAN_STATUS_SUCCESS) {
2334 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2335 mgmt->sa, status_code);
2336 ieee80211_destroy_auth_data(sdata, false);
2337 return RX_MGMT_CFG80211_RX_AUTH;
2338 }
2339
2340 switch (ifmgd->auth_data->algorithm) {
2341 case WLAN_AUTH_OPEN:
2342 case WLAN_AUTH_LEAP:
2343 case WLAN_AUTH_FT:
2344 case WLAN_AUTH_SAE:
2345 break;
2346 case WLAN_AUTH_SHARED_KEY:
2347 if (ifmgd->auth_data->expected_transaction != 4) {
2348 ieee80211_auth_challenge(sdata, mgmt, len);
2349 /* need another frame */
2350 return RX_MGMT_NONE;
2351 }
2352 break;
2353 default:
2354 WARN_ONCE(1, "invalid auth alg %d",
2355 ifmgd->auth_data->algorithm);
2356 return RX_MGMT_NONE;
2357 }
2358
2359 sdata_info(sdata, "authenticated\n");
2360 ifmgd->auth_data->done = true;
2361 ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2362 ifmgd->auth_data->timeout_started = true;
2363 run_again(ifmgd, ifmgd->auth_data->timeout);
2364
2365 if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2366 ifmgd->auth_data->expected_transaction != 2) {
2367 /*
2368 * Report auth frame to user space for processing since another
2369 * round of Authentication frames is still needed.
2370 */
2371 return RX_MGMT_CFG80211_RX_AUTH;
2372 }
2373
2374 /* move station state to auth */
2375 mutex_lock(&sdata->local->sta_mtx);
2376 sta = sta_info_get(sdata, bssid);
2377 if (!sta) {
2378 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2379 goto out_err;
2380 }
2381 if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2382 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2383 goto out_err;
2384 }
2385 mutex_unlock(&sdata->local->sta_mtx);
2386
2387 return RX_MGMT_CFG80211_RX_AUTH;
2388 out_err:
2389 mutex_unlock(&sdata->local->sta_mtx);
2390 /* ignore frame -- wait for timeout */
2391 return RX_MGMT_NONE;
2392 }
2393
2394
2395 static enum rx_mgmt_action __must_check
2396 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2397 struct ieee80211_mgmt *mgmt, size_t len)
2398 {
2399 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2400 const u8 *bssid = NULL;
2401 u16 reason_code;
2402
2403 lockdep_assert_held(&ifmgd->mtx);
2404
2405 if (len < 24 + 2)
2406 return RX_MGMT_NONE;
2407
2408 if (!ifmgd->associated ||
2409 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2410 return RX_MGMT_NONE;
2411
2412 bssid = ifmgd->associated->bssid;
2413
2414 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2415
2416 sdata_info(sdata, "deauthenticated from %pM (Reason: %u)\n",
2417 bssid, reason_code);
2418
2419 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2420
2421 return RX_MGMT_CFG80211_DEAUTH;
2422 }
2423
2424
2425 static enum rx_mgmt_action __must_check
2426 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2427 struct ieee80211_mgmt *mgmt, size_t len)
2428 {
2429 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2430 u16 reason_code;
2431
2432 lockdep_assert_held(&ifmgd->mtx);
2433
2434 if (len < 24 + 2)
2435 return RX_MGMT_NONE;
2436
2437 if (!ifmgd->associated ||
2438 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2439 return RX_MGMT_NONE;
2440
2441 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2442
2443 sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2444 mgmt->sa, reason_code);
2445
2446 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2447
2448 return RX_MGMT_CFG80211_DISASSOC;
2449 }
2450
2451 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2452 u8 *supp_rates, unsigned int supp_rates_len,
2453 u32 *rates, u32 *basic_rates,
2454 bool *have_higher_than_11mbit,
2455 int *min_rate, int *min_rate_index)
2456 {
2457 int i, j;
2458
2459 for (i = 0; i < supp_rates_len; i++) {
2460 int rate = (supp_rates[i] & 0x7f) * 5;
2461 bool is_basic = !!(supp_rates[i] & 0x80);
2462
2463 if (rate > 110)
2464 *have_higher_than_11mbit = true;
2465
2466 /*
2467 * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2468 * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2469 *
2470 * Note: Even through the membership selector and the basic
2471 * rate flag share the same bit, they are not exactly
2472 * the same.
2473 */
2474 if (!!(supp_rates[i] & 0x80) &&
2475 (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2476 continue;
2477
2478 for (j = 0; j < sband->n_bitrates; j++) {
2479 if (sband->bitrates[j].bitrate == rate) {
2480 *rates |= BIT(j);
2481 if (is_basic)
2482 *basic_rates |= BIT(j);
2483 if (rate < *min_rate) {
2484 *min_rate = rate;
2485 *min_rate_index = j;
2486 }
2487 break;
2488 }
2489 }
2490 }
2491 }
2492
2493 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2494 bool assoc)
2495 {
2496 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2497
2498 lockdep_assert_held(&sdata->u.mgd.mtx);
2499
2500 if (!assoc) {
2501 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2502
2503 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2504 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2505 sdata->u.mgd.flags = 0;
2506 ieee80211_vif_release_channel(sdata);
2507 }
2508
2509 kfree(assoc_data);
2510 sdata->u.mgd.assoc_data = NULL;
2511 }
2512
2513 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2514 struct cfg80211_bss *cbss,
2515 struct ieee80211_mgmt *mgmt, size_t len)
2516 {
2517 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2518 struct ieee80211_local *local = sdata->local;
2519 struct ieee80211_supported_band *sband;
2520 struct sta_info *sta;
2521 u8 *pos;
2522 u16 capab_info, aid;
2523 struct ieee802_11_elems elems;
2524 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2525 const struct cfg80211_bss_ies *bss_ies = NULL;
2526 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2527 u32 changed = 0;
2528 int err;
2529 bool ret;
2530
2531 /* AssocResp and ReassocResp have identical structure */
2532
2533 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2534 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2535
2536 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2537 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2538 aid);
2539 aid &= ~(BIT(15) | BIT(14));
2540
2541 ifmgd->broken_ap = false;
2542
2543 if (aid == 0 || aid > IEEE80211_MAX_AID) {
2544 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2545 aid);
2546 aid = 0;
2547 ifmgd->broken_ap = true;
2548 }
2549
2550 pos = mgmt->u.assoc_resp.variable;
2551 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2552
2553 if (!elems.supp_rates) {
2554 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2555 return false;
2556 }
2557
2558 ifmgd->aid = aid;
2559
2560 /*
2561 * Some APs are erroneously not including some information in their
2562 * (re)association response frames. Try to recover by using the data
2563 * from the beacon or probe response. This seems to afflict mobile
2564 * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2565 * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2566 */
2567 if ((assoc_data->wmm && !elems.wmm_param) ||
2568 (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2569 (!elems.ht_cap_elem || !elems.ht_operation)) ||
2570 (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2571 (!elems.vht_cap_elem || !elems.vht_operation))) {
2572 const struct cfg80211_bss_ies *ies;
2573 struct ieee802_11_elems bss_elems;
2574
2575 rcu_read_lock();
2576 ies = rcu_dereference(cbss->ies);
2577 if (ies)
2578 bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2579 GFP_ATOMIC);
2580 rcu_read_unlock();
2581 if (!bss_ies)
2582 return false;
2583
2584 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2585 false, &bss_elems);
2586 if (assoc_data->wmm &&
2587 !elems.wmm_param && bss_elems.wmm_param) {
2588 elems.wmm_param = bss_elems.wmm_param;
2589 sdata_info(sdata,
2590 "AP bug: WMM param missing from AssocResp\n");
2591 }
2592
2593 /*
2594 * Also check if we requested HT/VHT, otherwise the AP doesn't
2595 * have to include the IEs in the (re)association response.
2596 */
2597 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2598 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2599 elems.ht_cap_elem = bss_elems.ht_cap_elem;
2600 sdata_info(sdata,
2601 "AP bug: HT capability missing from AssocResp\n");
2602 }
2603 if (!elems.ht_operation && bss_elems.ht_operation &&
2604 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2605 elems.ht_operation = bss_elems.ht_operation;
2606 sdata_info(sdata,
2607 "AP bug: HT operation missing from AssocResp\n");
2608 }
2609 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2610 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2611 elems.vht_cap_elem = bss_elems.vht_cap_elem;
2612 sdata_info(sdata,
2613 "AP bug: VHT capa missing from AssocResp\n");
2614 }
2615 if (!elems.vht_operation && bss_elems.vht_operation &&
2616 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2617 elems.vht_operation = bss_elems.vht_operation;
2618 sdata_info(sdata,
2619 "AP bug: VHT operation missing from AssocResp\n");
2620 }
2621 }
2622
2623 /*
2624 * We previously checked these in the beacon/probe response, so
2625 * they should be present here. This is just a safety net.
2626 */
2627 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2628 (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2629 sdata_info(sdata,
2630 "HT AP is missing WMM params or HT capability/operation\n");
2631 ret = false;
2632 goto out;
2633 }
2634
2635 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2636 (!elems.vht_cap_elem || !elems.vht_operation)) {
2637 sdata_info(sdata,
2638 "VHT AP is missing VHT capability/operation\n");
2639 ret = false;
2640 goto out;
2641 }
2642
2643 mutex_lock(&sdata->local->sta_mtx);
2644 /*
2645 * station info was already allocated and inserted before
2646 * the association and should be available to us
2647 */
2648 sta = sta_info_get(sdata, cbss->bssid);
2649 if (WARN_ON(!sta)) {
2650 mutex_unlock(&sdata->local->sta_mtx);
2651 ret = false;
2652 goto out;
2653 }
2654
2655 sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2656
2657 /* Set up internal HT/VHT capabilities */
2658 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2659 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2660 elems.ht_cap_elem, sta);
2661
2662 if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
2663 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2664 elems.vht_cap_elem, sta);
2665
2666 /*
2667 * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
2668 * in their association response, so ignore that data for our own
2669 * configuration. If it changed since the last beacon, we'll get the
2670 * next beacon and update then.
2671 */
2672
2673 /*
2674 * If an operating mode notification IE is present, override the
2675 * NSS calculation (that would be done in rate_control_rate_init())
2676 * and use the # of streams from that element.
2677 */
2678 if (elems.opmode_notif &&
2679 !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
2680 u8 nss;
2681
2682 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
2683 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
2684 nss += 1;
2685 sta->sta.rx_nss = nss;
2686 }
2687
2688 rate_control_rate_init(sta);
2689
2690 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2691 set_sta_flag(sta, WLAN_STA_MFP);
2692
2693 if (elems.wmm_param)
2694 set_sta_flag(sta, WLAN_STA_WME);
2695
2696 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2697 if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2698 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2699 if (err) {
2700 sdata_info(sdata,
2701 "failed to move station %pM to desired state\n",
2702 sta->sta.addr);
2703 WARN_ON(__sta_info_destroy(sta));
2704 mutex_unlock(&sdata->local->sta_mtx);
2705 ret = false;
2706 goto out;
2707 }
2708
2709 mutex_unlock(&sdata->local->sta_mtx);
2710
2711 /*
2712 * Always handle WMM once after association regardless
2713 * of the first value the AP uses. Setting -1 here has
2714 * that effect because the AP values is an unsigned
2715 * 4-bit value.
2716 */
2717 ifmgd->wmm_last_param_set = -1;
2718
2719 if (elems.wmm_param)
2720 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2721 elems.wmm_param_len);
2722 else
2723 ieee80211_set_wmm_default(sdata, false);
2724 changed |= BSS_CHANGED_QOS;
2725
2726 /* set AID and assoc capability,
2727 * ieee80211_set_associated() will tell the driver */
2728 bss_conf->aid = aid;
2729 bss_conf->assoc_capability = capab_info;
2730 ieee80211_set_associated(sdata, cbss, changed);
2731
2732 /*
2733 * If we're using 4-addr mode, let the AP know that we're
2734 * doing so, so that it can create the STA VLAN on its side
2735 */
2736 if (ifmgd->use_4addr)
2737 ieee80211_send_4addr_nullfunc(local, sdata);
2738
2739 /*
2740 * Start timer to probe the connection to the AP now.
2741 * Also start the timer that will detect beacon loss.
2742 */
2743 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2744 ieee80211_sta_reset_beacon_monitor(sdata);
2745
2746 ret = true;
2747 out:
2748 kfree(bss_ies);
2749 return ret;
2750 }
2751
2752 static enum rx_mgmt_action __must_check
2753 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2754 struct ieee80211_mgmt *mgmt, size_t len,
2755 struct cfg80211_bss **bss)
2756 {
2757 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2758 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2759 u16 capab_info, status_code, aid;
2760 struct ieee802_11_elems elems;
2761 u8 *pos;
2762 bool reassoc;
2763
2764 lockdep_assert_held(&ifmgd->mtx);
2765
2766 if (!assoc_data)
2767 return RX_MGMT_NONE;
2768 if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2769 return RX_MGMT_NONE;
2770
2771 /*
2772 * AssocResp and ReassocResp have identical structure, so process both
2773 * of them in this function.
2774 */
2775
2776 if (len < 24 + 6)
2777 return RX_MGMT_NONE;
2778
2779 reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2780 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2781 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2782 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2783
2784 sdata_info(sdata,
2785 "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
2786 reassoc ? "Rea" : "A", mgmt->sa,
2787 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2788
2789 pos = mgmt->u.assoc_resp.variable;
2790 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2791
2792 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2793 elems.timeout_int &&
2794 elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2795 u32 tu, ms;
2796 tu = le32_to_cpu(elems.timeout_int->value);
2797 ms = tu * 1024 / 1000;
2798 sdata_info(sdata,
2799 "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
2800 mgmt->sa, tu, ms);
2801 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2802 assoc_data->timeout_started = true;
2803 if (ms > IEEE80211_ASSOC_TIMEOUT)
2804 run_again(ifmgd, assoc_data->timeout);
2805 return RX_MGMT_NONE;
2806 }
2807
2808 *bss = assoc_data->bss;
2809
2810 if (status_code != WLAN_STATUS_SUCCESS) {
2811 sdata_info(sdata, "%pM denied association (code=%d)\n",
2812 mgmt->sa, status_code);
2813 ieee80211_destroy_assoc_data(sdata, false);
2814 } else {
2815 if (!ieee80211_assoc_success(sdata, *bss, mgmt, len)) {
2816 /* oops -- internal error -- send timeout for now */
2817 ieee80211_destroy_assoc_data(sdata, false);
2818 cfg80211_put_bss(sdata->local->hw.wiphy, *bss);
2819 return RX_MGMT_CFG80211_ASSOC_TIMEOUT;
2820 }
2821 sdata_info(sdata, "associated\n");
2822
2823 /*
2824 * destroy assoc_data afterwards, as otherwise an idle
2825 * recalc after assoc_data is NULL but before associated
2826 * is set can cause the interface to go idle
2827 */
2828 ieee80211_destroy_assoc_data(sdata, true);
2829 }
2830
2831 return RX_MGMT_CFG80211_RX_ASSOC;
2832 }
2833
2834 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2835 struct ieee80211_mgmt *mgmt, size_t len,
2836 struct ieee80211_rx_status *rx_status,
2837 struct ieee802_11_elems *elems)
2838 {
2839 struct ieee80211_local *local = sdata->local;
2840 int freq;
2841 struct ieee80211_bss *bss;
2842 struct ieee80211_channel *channel;
2843 bool need_ps = false;
2844
2845 lockdep_assert_held(&sdata->u.mgd.mtx);
2846
2847 if ((sdata->u.mgd.associated &&
2848 ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid)) ||
2849 (sdata->u.mgd.assoc_data &&
2850 ether_addr_equal(mgmt->bssid,
2851 sdata->u.mgd.assoc_data->bss->bssid))) {
2852 /* not previously set so we may need to recalc */
2853 need_ps = sdata->u.mgd.associated && !sdata->u.mgd.dtim_period;
2854
2855 if (elems->tim && !elems->parse_error) {
2856 const struct ieee80211_tim_ie *tim_ie = elems->tim;
2857 sdata->u.mgd.dtim_period = tim_ie->dtim_period;
2858 }
2859 }
2860
2861 if (elems->ds_params)
2862 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
2863 rx_status->band);
2864 else
2865 freq = rx_status->freq;
2866
2867 channel = ieee80211_get_channel(local->hw.wiphy, freq);
2868
2869 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2870 return;
2871
2872 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2873 channel);
2874 if (bss)
2875 ieee80211_rx_bss_put(local, bss);
2876
2877 if (!sdata->u.mgd.associated ||
2878 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid))
2879 return;
2880
2881 if (need_ps) {
2882 mutex_lock(&local->iflist_mtx);
2883 ieee80211_recalc_ps(local, -1);
2884 mutex_unlock(&local->iflist_mtx);
2885 }
2886
2887 ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
2888 elems, true);
2889
2890 }
2891
2892
2893 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2894 struct sk_buff *skb)
2895 {
2896 struct ieee80211_mgmt *mgmt = (void *)skb->data;
2897 struct ieee80211_if_managed *ifmgd;
2898 struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2899 size_t baselen, len = skb->len;
2900 struct ieee802_11_elems elems;
2901
2902 ifmgd = &sdata->u.mgd;
2903
2904 ASSERT_MGD_MTX(ifmgd);
2905
2906 if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2907 return; /* ignore ProbeResp to foreign address */
2908
2909 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2910 if (baselen > len)
2911 return;
2912
2913 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2914 false, &elems);
2915
2916 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2917
2918 if (ifmgd->associated &&
2919 ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2920 ieee80211_reset_ap_probe(sdata);
2921
2922 if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2923 ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
2924 /* got probe response, continue with auth */
2925 sdata_info(sdata, "direct probe responded\n");
2926 ifmgd->auth_data->tries = 0;
2927 ifmgd->auth_data->timeout = jiffies;
2928 ifmgd->auth_data->timeout_started = true;
2929 run_again(ifmgd, ifmgd->auth_data->timeout);
2930 }
2931 }
2932
2933 /*
2934 * This is the canonical list of information elements we care about,
2935 * the filter code also gives us all changes to the Microsoft OUI
2936 * (00:50:F2) vendor IE which is used for WMM which we need to track.
2937 *
2938 * We implement beacon filtering in software since that means we can
2939 * avoid processing the frame here and in cfg80211, and userspace
2940 * will not be able to tell whether the hardware supports it or not.
2941 *
2942 * XXX: This list needs to be dynamic -- userspace needs to be able to
2943 * add items it requires. It also needs to be able to tell us to
2944 * look out for other vendor IEs.
2945 */
2946 static const u64 care_about_ies =
2947 (1ULL << WLAN_EID_COUNTRY) |
2948 (1ULL << WLAN_EID_ERP_INFO) |
2949 (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2950 (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2951 (1ULL << WLAN_EID_HT_CAPABILITY) |
2952 (1ULL << WLAN_EID_HT_OPERATION);
2953
2954 static enum rx_mgmt_action
2955 ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2956 struct ieee80211_mgmt *mgmt, size_t len,
2957 u8 *deauth_buf, struct ieee80211_rx_status *rx_status)
2958 {
2959 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2960 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2961 size_t baselen;
2962 struct ieee802_11_elems elems;
2963 struct ieee80211_local *local = sdata->local;
2964 struct ieee80211_chanctx_conf *chanctx_conf;
2965 struct ieee80211_channel *chan;
2966 struct sta_info *sta;
2967 u32 changed = 0;
2968 bool erp_valid;
2969 u8 erp_value = 0;
2970 u32 ncrc;
2971 u8 *bssid;
2972
2973 lockdep_assert_held(&ifmgd->mtx);
2974
2975 /* Process beacon from the current BSS */
2976 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2977 if (baselen > len)
2978 return RX_MGMT_NONE;
2979
2980 rcu_read_lock();
2981 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2982 if (!chanctx_conf) {
2983 rcu_read_unlock();
2984 return RX_MGMT_NONE;
2985 }
2986
2987 if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
2988 rcu_read_unlock();
2989 return RX_MGMT_NONE;
2990 }
2991 chan = chanctx_conf->def.chan;
2992 rcu_read_unlock();
2993
2994 if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
2995 ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2996 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2997 len - baselen, false, &elems);
2998
2999 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3000 ifmgd->assoc_data->have_beacon = true;
3001 ifmgd->assoc_data->need_beacon = false;
3002 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
3003 sdata->vif.bss_conf.sync_tsf =
3004 le64_to_cpu(mgmt->u.beacon.timestamp);
3005 sdata->vif.bss_conf.sync_device_ts =
3006 rx_status->device_timestamp;
3007 if (elems.tim)
3008 sdata->vif.bss_conf.sync_dtim_count =
3009 elems.tim->dtim_count;
3010 else
3011 sdata->vif.bss_conf.sync_dtim_count = 0;
3012 }
3013 /* continue assoc process */
3014 ifmgd->assoc_data->timeout = jiffies;
3015 ifmgd->assoc_data->timeout_started = true;
3016 run_again(ifmgd, ifmgd->assoc_data->timeout);
3017 return RX_MGMT_NONE;
3018 }
3019
3020 if (!ifmgd->associated ||
3021 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3022 return RX_MGMT_NONE;
3023 bssid = ifmgd->associated->bssid;
3024
3025 /* Track average RSSI from the Beacon frames of the current AP */
3026 ifmgd->last_beacon_signal = rx_status->signal;
3027 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
3028 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3029 ifmgd->ave_beacon_signal = rx_status->signal * 16;
3030 ifmgd->last_cqm_event_signal = 0;
3031 ifmgd->count_beacon_signal = 1;
3032 ifmgd->last_ave_beacon_signal = 0;
3033 } else {
3034 ifmgd->ave_beacon_signal =
3035 (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
3036 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
3037 ifmgd->ave_beacon_signal) / 16;
3038 ifmgd->count_beacon_signal++;
3039 }
3040
3041 if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3042 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3043 int sig = ifmgd->ave_beacon_signal;
3044 int last_sig = ifmgd->last_ave_beacon_signal;
3045
3046 /*
3047 * if signal crosses either of the boundaries, invoke callback
3048 * with appropriate parameters
3049 */
3050 if (sig > ifmgd->rssi_max_thold &&
3051 (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3052 ifmgd->last_ave_beacon_signal = sig;
3053 drv_rssi_callback(local, sdata, RSSI_EVENT_HIGH);
3054 } else if (sig < ifmgd->rssi_min_thold &&
3055 (last_sig >= ifmgd->rssi_max_thold ||
3056 last_sig == 0)) {
3057 ifmgd->last_ave_beacon_signal = sig;
3058 drv_rssi_callback(local, sdata, RSSI_EVENT_LOW);
3059 }
3060 }
3061
3062 if (bss_conf->cqm_rssi_thold &&
3063 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3064 !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3065 int sig = ifmgd->ave_beacon_signal / 16;
3066 int last_event = ifmgd->last_cqm_event_signal;
3067 int thold = bss_conf->cqm_rssi_thold;
3068 int hyst = bss_conf->cqm_rssi_hyst;
3069 if (sig < thold &&
3070 (last_event == 0 || sig < last_event - hyst)) {
3071 ifmgd->last_cqm_event_signal = sig;
3072 ieee80211_cqm_rssi_notify(
3073 &sdata->vif,
3074 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3075 GFP_KERNEL);
3076 } else if (sig > thold &&
3077 (last_event == 0 || sig > last_event + hyst)) {
3078 ifmgd->last_cqm_event_signal = sig;
3079 ieee80211_cqm_rssi_notify(
3080 &sdata->vif,
3081 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3082 GFP_KERNEL);
3083 }
3084 }
3085
3086 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
3087 mlme_dbg_ratelimited(sdata,
3088 "cancelling AP probe due to a received beacon\n");
3089 mutex_lock(&local->mtx);
3090 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
3091 ieee80211_run_deferred_scan(local);
3092 mutex_unlock(&local->mtx);
3093
3094 mutex_lock(&local->iflist_mtx);
3095 ieee80211_recalc_ps(local, -1);
3096 mutex_unlock(&local->iflist_mtx);
3097 }
3098
3099 /*
3100 * Push the beacon loss detection into the future since
3101 * we are processing a beacon from the AP just now.
3102 */
3103 ieee80211_sta_reset_beacon_monitor(sdata);
3104
3105 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3106 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3107 len - baselen, false, &elems,
3108 care_about_ies, ncrc);
3109
3110 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
3111 bool directed_tim = ieee80211_check_tim(elems.tim,
3112 elems.tim_len,
3113 ifmgd->aid);
3114 if (directed_tim) {
3115 if (local->hw.conf.dynamic_ps_timeout > 0) {
3116 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3117 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3118 ieee80211_hw_config(local,
3119 IEEE80211_CONF_CHANGE_PS);
3120 }
3121 ieee80211_send_nullfunc(local, sdata, 0);
3122 } else if (!local->pspolling && sdata->u.mgd.powersave) {
3123 local->pspolling = true;
3124
3125 /*
3126 * Here is assumed that the driver will be
3127 * able to send ps-poll frame and receive a
3128 * response even though power save mode is
3129 * enabled, but some drivers might require
3130 * to disable power save here. This needs
3131 * to be investigated.
3132 */
3133 ieee80211_send_pspoll(local, sdata);
3134 }
3135 }
3136 }
3137
3138 if (sdata->vif.p2p) {
3139 struct ieee80211_p2p_noa_attr noa = {};
3140 int ret;
3141
3142 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3143 len - baselen,
3144 IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3145 (u8 *) &noa, sizeof(noa));
3146 if (ret >= 2) {
3147 if (sdata->u.mgd.p2p_noa_index != noa.index) {
3148 /* valid noa_attr and index changed */
3149 sdata->u.mgd.p2p_noa_index = noa.index;
3150 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3151 changed |= BSS_CHANGED_P2P_PS;
3152 /*
3153 * make sure we update all information, the CRC
3154 * mechanism doesn't look at P2P attributes.
3155 */
3156 ifmgd->beacon_crc_valid = false;
3157 }
3158 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3159 /* noa_attr not found and we had valid noa_attr before */
3160 sdata->u.mgd.p2p_noa_index = -1;
3161 memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3162 changed |= BSS_CHANGED_P2P_PS;
3163 ifmgd->beacon_crc_valid = false;
3164 }
3165 }
3166
3167 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3168 return RX_MGMT_NONE;
3169 ifmgd->beacon_crc = ncrc;
3170 ifmgd->beacon_crc_valid = true;
3171
3172 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3173
3174 if (ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3175 elems.wmm_param_len))
3176 changed |= BSS_CHANGED_QOS;
3177
3178 /*
3179 * If we haven't had a beacon before, tell the driver about the
3180 * DTIM period (and beacon timing if desired) now.
3181 */
3182 if (!bss_conf->dtim_period) {
3183 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3184 if (elems.tim)
3185 bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3186 else
3187 bss_conf->dtim_period = 1;
3188
3189 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
3190 sdata->vif.bss_conf.sync_tsf =
3191 le64_to_cpu(mgmt->u.beacon.timestamp);
3192 sdata->vif.bss_conf.sync_device_ts =
3193 rx_status->device_timestamp;
3194 if (elems.tim)
3195 sdata->vif.bss_conf.sync_dtim_count =
3196 elems.tim->dtim_count;
3197 else
3198 sdata->vif.bss_conf.sync_dtim_count = 0;
3199 }
3200
3201 changed |= BSS_CHANGED_DTIM_PERIOD;
3202 }
3203
3204 if (elems.erp_info) {
3205 erp_valid = true;
3206 erp_value = elems.erp_info[0];
3207 } else {
3208 erp_valid = false;
3209 }
3210 changed |= ieee80211_handle_bss_capability(sdata,
3211 le16_to_cpu(mgmt->u.beacon.capab_info),
3212 erp_valid, erp_value);
3213
3214 mutex_lock(&local->sta_mtx);
3215 sta = sta_info_get(sdata, bssid);
3216
3217 if (ieee80211_config_bw(sdata, sta, elems.ht_operation,
3218 elems.vht_operation, bssid, &changed)) {
3219 mutex_unlock(&local->sta_mtx);
3220 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3221 WLAN_REASON_DEAUTH_LEAVING,
3222 true, deauth_buf);
3223 return RX_MGMT_CFG80211_TX_DEAUTH;
3224 }
3225
3226 if (sta && elems.opmode_notif)
3227 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3228 rx_status->band, true);
3229 mutex_unlock(&local->sta_mtx);
3230
3231 if (elems.country_elem && elems.pwr_constr_elem &&
3232 mgmt->u.probe_resp.capab_info &
3233 cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT))
3234 changed |= ieee80211_handle_pwr_constr(sdata, chan,
3235 elems.country_elem,
3236 elems.country_elem_len,
3237 elems.pwr_constr_elem);
3238
3239 ieee80211_bss_info_change_notify(sdata, changed);
3240
3241 return RX_MGMT_NONE;
3242 }
3243
3244 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3245 struct sk_buff *skb)
3246 {
3247 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3248 struct ieee80211_rx_status *rx_status;
3249 struct ieee80211_mgmt *mgmt;
3250 struct cfg80211_bss *bss = NULL;
3251 enum rx_mgmt_action rma = RX_MGMT_NONE;
3252 u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3253 u16 fc;
3254 struct ieee802_11_elems elems;
3255 int ies_len;
3256
3257 rx_status = (struct ieee80211_rx_status *) skb->cb;
3258 mgmt = (struct ieee80211_mgmt *) skb->data;
3259 fc = le16_to_cpu(mgmt->frame_control);
3260
3261 mutex_lock(&ifmgd->mtx);
3262
3263 switch (fc & IEEE80211_FCTL_STYPE) {
3264 case IEEE80211_STYPE_BEACON:
3265 rma = ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
3266 deauth_buf, rx_status);
3267 break;
3268 case IEEE80211_STYPE_PROBE_RESP:
3269 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3270 break;
3271 case IEEE80211_STYPE_AUTH:
3272 rma = ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3273 break;
3274 case IEEE80211_STYPE_DEAUTH:
3275 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3276 break;
3277 case IEEE80211_STYPE_DISASSOC:
3278 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3279 break;
3280 case IEEE80211_STYPE_ASSOC_RESP:
3281 case IEEE80211_STYPE_REASSOC_RESP:
3282 rma = ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, &bss);
3283 break;
3284 case IEEE80211_STYPE_ACTION:
3285 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3286 ies_len = skb->len -
3287 offsetof(struct ieee80211_mgmt,
3288 u.action.u.chan_switch.variable);
3289
3290 if (ies_len < 0)
3291 break;
3292
3293 ieee802_11_parse_elems(
3294 mgmt->u.action.u.chan_switch.variable,
3295 ies_len, true, &elems);
3296
3297 if (elems.parse_error)
3298 break;
3299
3300 ieee80211_sta_process_chanswitch(sdata,
3301 rx_status->mactime,
3302 &elems, false);
3303 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3304 ies_len = skb->len -
3305 offsetof(struct ieee80211_mgmt,
3306 u.action.u.ext_chan_switch.variable);
3307
3308 if (ies_len < 0)
3309 break;
3310
3311 ieee802_11_parse_elems(
3312 mgmt->u.action.u.ext_chan_switch.variable,
3313 ies_len, true, &elems);
3314
3315 if (elems.parse_error)
3316 break;
3317
3318 /* for the handling code pretend this was also an IE */
3319 elems.ext_chansw_ie =
3320 &mgmt->u.action.u.ext_chan_switch.data;
3321
3322 ieee80211_sta_process_chanswitch(sdata,
3323 rx_status->mactime,
3324 &elems, false);
3325 }
3326 break;
3327 }
3328 mutex_unlock(&ifmgd->mtx);
3329
3330 switch (rma) {
3331 case RX_MGMT_NONE:
3332 /* no action */
3333 break;
3334 case RX_MGMT_CFG80211_DEAUTH:
3335 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
3336 break;
3337 case RX_MGMT_CFG80211_DISASSOC:
3338 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
3339 break;
3340 case RX_MGMT_CFG80211_RX_AUTH:
3341 cfg80211_send_rx_auth(sdata->dev, (u8 *)mgmt, skb->len);
3342 break;
3343 case RX_MGMT_CFG80211_RX_ASSOC:
3344 cfg80211_send_rx_assoc(sdata->dev, bss, (u8 *)mgmt, skb->len);
3345 break;
3346 case RX_MGMT_CFG80211_ASSOC_TIMEOUT:
3347 cfg80211_send_assoc_timeout(sdata->dev, mgmt->bssid);
3348 break;
3349 case RX_MGMT_CFG80211_TX_DEAUTH:
3350 cfg80211_send_deauth(sdata->dev, deauth_buf,
3351 sizeof(deauth_buf));
3352 break;
3353 default:
3354 WARN(1, "unexpected: %d", rma);
3355 }
3356 }
3357
3358 static void ieee80211_sta_timer(unsigned long data)
3359 {
3360 struct ieee80211_sub_if_data *sdata =
3361 (struct ieee80211_sub_if_data *) data;
3362
3363 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3364 }
3365
3366 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3367 u8 *bssid, u8 reason, bool tx)
3368 {
3369 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3370 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3371
3372 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3373 tx, frame_buf);
3374 mutex_unlock(&ifmgd->mtx);
3375
3376 /*
3377 * must be outside lock due to cfg80211,
3378 * but that's not a problem.
3379 */
3380 cfg80211_send_deauth(sdata->dev, frame_buf, IEEE80211_DEAUTH_FRAME_LEN);
3381
3382 mutex_lock(&ifmgd->mtx);
3383 }
3384
3385 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
3386 {
3387 struct ieee80211_local *local = sdata->local;
3388 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3389 struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3390 u32 tx_flags = 0;
3391
3392 lockdep_assert_held(&ifmgd->mtx);
3393
3394 if (WARN_ON_ONCE(!auth_data))
3395 return -EINVAL;
3396
3397 auth_data->tries++;
3398
3399 if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3400 sdata_info(sdata, "authentication with %pM timed out\n",
3401 auth_data->bss->bssid);
3402
3403 /*
3404 * Most likely AP is not in the range so remove the
3405 * bss struct for that AP.
3406 */
3407 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3408
3409 return -ETIMEDOUT;
3410 }
3411
3412 drv_mgd_prepare_tx(local, sdata);
3413
3414 if (auth_data->bss->proberesp_ies) {
3415 u16 trans = 1;
3416 u16 status = 0;
3417
3418 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3419 auth_data->bss->bssid, auth_data->tries,
3420 IEEE80211_AUTH_MAX_TRIES);
3421
3422 auth_data->expected_transaction = 2;
3423
3424 if (auth_data->algorithm == WLAN_AUTH_SAE) {
3425 trans = auth_data->sae_trans;
3426 status = auth_data->sae_status;
3427 auth_data->expected_transaction = trans;
3428 }
3429
3430 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3431 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3432 IEEE80211_TX_INTFL_MLME_CONN_TX;
3433
3434 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3435 auth_data->data, auth_data->data_len,
3436 auth_data->bss->bssid,
3437 auth_data->bss->bssid, NULL, 0, 0,
3438 tx_flags);
3439 } else {
3440 const u8 *ssidie;
3441
3442 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
3443 auth_data->bss->bssid, auth_data->tries,
3444 IEEE80211_AUTH_MAX_TRIES);
3445
3446 rcu_read_lock();
3447 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
3448 if (!ssidie) {
3449 rcu_read_unlock();
3450 return -EINVAL;
3451 }
3452 /*
3453 * Direct probe is sent to broadcast address as some APs
3454 * will not answer to direct packet in unassociated state.
3455 */
3456 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
3457 NULL, 0, (u32) -1, true, 0,
3458 auth_data->bss->channel, false);
3459 rcu_read_unlock();
3460 }
3461
3462 if (tx_flags == 0) {
3463 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3464 ifmgd->auth_data->timeout_started = true;
3465 run_again(ifmgd, auth_data->timeout);
3466 } else {
3467 auth_data->timeout_started = false;
3468 }
3469
3470 return 0;
3471 }
3472
3473 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3474 {
3475 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3476 struct ieee80211_local *local = sdata->local;
3477
3478 lockdep_assert_held(&sdata->u.mgd.mtx);
3479
3480 assoc_data->tries++;
3481 if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3482 sdata_info(sdata, "association with %pM timed out\n",
3483 assoc_data->bss->bssid);
3484
3485 /*
3486 * Most likely AP is not in the range so remove the
3487 * bss struct for that AP.
3488 */
3489 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3490
3491 return -ETIMEDOUT;
3492 }
3493
3494 sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3495 assoc_data->bss->bssid, assoc_data->tries,
3496 IEEE80211_ASSOC_MAX_TRIES);
3497 ieee80211_send_assoc(sdata);
3498
3499 if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
3500 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3501 assoc_data->timeout_started = true;
3502 run_again(&sdata->u.mgd, assoc_data->timeout);
3503 } else {
3504 assoc_data->timeout_started = false;
3505 }
3506
3507 return 0;
3508 }
3509
3510 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3511 __le16 fc, bool acked)
3512 {
3513 struct ieee80211_local *local = sdata->local;
3514
3515 sdata->u.mgd.status_fc = fc;
3516 sdata->u.mgd.status_acked = acked;
3517 sdata->u.mgd.status_received = true;
3518
3519 ieee80211_queue_work(&local->hw, &sdata->work);
3520 }
3521
3522 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3523 {
3524 struct ieee80211_local *local = sdata->local;
3525 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3526
3527 mutex_lock(&ifmgd->mtx);
3528
3529 if (ifmgd->status_received) {
3530 __le16 fc = ifmgd->status_fc;
3531 bool status_acked = ifmgd->status_acked;
3532
3533 ifmgd->status_received = false;
3534 if (ifmgd->auth_data &&
3535 (ieee80211_is_probe_req(fc) || ieee80211_is_auth(fc))) {
3536 if (status_acked) {
3537 ifmgd->auth_data->timeout =
3538 jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3539 run_again(ifmgd, ifmgd->auth_data->timeout);
3540 } else {
3541 ifmgd->auth_data->timeout = jiffies - 1;
3542 }
3543 ifmgd->auth_data->timeout_started = true;
3544 } else if (ifmgd->assoc_data &&
3545 (ieee80211_is_assoc_req(fc) ||
3546 ieee80211_is_reassoc_req(fc))) {
3547 if (status_acked) {
3548 ifmgd->assoc_data->timeout =
3549 jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3550 run_again(ifmgd, ifmgd->assoc_data->timeout);
3551 } else {
3552 ifmgd->assoc_data->timeout = jiffies - 1;
3553 }
3554 ifmgd->assoc_data->timeout_started = true;
3555 }
3556 }
3557
3558 if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3559 time_after(jiffies, ifmgd->auth_data->timeout)) {
3560 if (ifmgd->auth_data->done) {
3561 /*
3562 * ok ... we waited for assoc but userspace didn't,
3563 * so let's just kill the auth data
3564 */
3565 ieee80211_destroy_auth_data(sdata, false);
3566 } else if (ieee80211_probe_auth(sdata)) {
3567 u8 bssid[ETH_ALEN];
3568
3569 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3570
3571 ieee80211_destroy_auth_data(sdata, false);
3572
3573 mutex_unlock(&ifmgd->mtx);
3574 cfg80211_send_auth_timeout(sdata->dev, bssid);
3575 mutex_lock(&ifmgd->mtx);
3576 }
3577 } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3578 run_again(ifmgd, ifmgd->auth_data->timeout);
3579
3580 if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3581 time_after(jiffies, ifmgd->assoc_data->timeout)) {
3582 if ((ifmgd->assoc_data->need_beacon &&
3583 !ifmgd->assoc_data->have_beacon) ||
3584 ieee80211_do_assoc(sdata)) {
3585 u8 bssid[ETH_ALEN];
3586
3587 memcpy(bssid, ifmgd->assoc_data->bss->bssid, ETH_ALEN);
3588
3589 ieee80211_destroy_assoc_data(sdata, false);
3590
3591 mutex_unlock(&ifmgd->mtx);
3592 cfg80211_send_assoc_timeout(sdata->dev, bssid);
3593 mutex_lock(&ifmgd->mtx);
3594 }
3595 } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3596 run_again(ifmgd, ifmgd->assoc_data->timeout);
3597
3598 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
3599 IEEE80211_STA_CONNECTION_POLL) &&
3600 ifmgd->associated) {
3601 u8 bssid[ETH_ALEN];
3602 int max_tries;
3603
3604 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3605
3606 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3607 max_tries = max_nullfunc_tries;
3608 else
3609 max_tries = max_probe_tries;
3610
3611 /* ACK received for nullfunc probing frame */
3612 if (!ifmgd->probe_send_count)
3613 ieee80211_reset_ap_probe(sdata);
3614 else if (ifmgd->nullfunc_failed) {
3615 if (ifmgd->probe_send_count < max_tries) {
3616 mlme_dbg(sdata,
3617 "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3618 bssid, ifmgd->probe_send_count,
3619 max_tries);
3620 ieee80211_mgd_probe_ap_send(sdata);
3621 } else {
3622 mlme_dbg(sdata,
3623 "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3624 bssid);
3625 ieee80211_sta_connection_lost(sdata, bssid,
3626 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3627 false);
3628 }
3629 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3630 run_again(ifmgd, ifmgd->probe_timeout);
3631 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
3632 mlme_dbg(sdata,
3633 "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3634 bssid, probe_wait_ms);
3635 ieee80211_sta_connection_lost(sdata, bssid,
3636 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3637 } else if (ifmgd->probe_send_count < max_tries) {
3638 mlme_dbg(sdata,
3639 "No probe response from AP %pM after %dms, try %d/%i\n",
3640 bssid, probe_wait_ms,
3641 ifmgd->probe_send_count, max_tries);
3642 ieee80211_mgd_probe_ap_send(sdata);
3643 } else {
3644 /*
3645 * We actually lost the connection ... or did we?
3646 * Let's make sure!
3647 */
3648 wiphy_debug(local->hw.wiphy,
3649 "%s: No probe response from AP %pM"
3650 " after %dms, disconnecting.\n",
3651 sdata->name,
3652 bssid, probe_wait_ms);
3653
3654 ieee80211_sta_connection_lost(sdata, bssid,
3655 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3656 }
3657 }
3658
3659 mutex_unlock(&ifmgd->mtx);
3660 }
3661
3662 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3663 {
3664 struct ieee80211_sub_if_data *sdata =
3665 (struct ieee80211_sub_if_data *) data;
3666 struct ieee80211_local *local = sdata->local;
3667
3668 if (local->quiescing)
3669 return;
3670
3671 sdata->u.mgd.connection_loss = false;
3672 ieee80211_queue_work(&sdata->local->hw,
3673 &sdata->u.mgd.beacon_connection_loss_work);
3674 }
3675
3676 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3677 {
3678 struct ieee80211_sub_if_data *sdata =
3679 (struct ieee80211_sub_if_data *) data;
3680 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3681 struct ieee80211_local *local = sdata->local;
3682
3683 if (local->quiescing)
3684 return;
3685
3686 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3687 }
3688
3689 static void ieee80211_sta_monitor_work(struct work_struct *work)
3690 {
3691 struct ieee80211_sub_if_data *sdata =
3692 container_of(work, struct ieee80211_sub_if_data,
3693 u.mgd.monitor_work);
3694
3695 ieee80211_mgd_probe_ap(sdata, false);
3696 }
3697
3698 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3699 {
3700 u32 flags;
3701
3702 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3703 __ieee80211_stop_poll(sdata);
3704
3705 /* let's probe the connection once */
3706 flags = sdata->local->hw.flags;
3707 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
3708 ieee80211_queue_work(&sdata->local->hw,
3709 &sdata->u.mgd.monitor_work);
3710 /* and do all the other regular work too */
3711 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3712 }
3713 }
3714
3715 #ifdef CONFIG_PM
3716 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
3717 {
3718 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3719
3720 mutex_lock(&ifmgd->mtx);
3721 if (!ifmgd->associated) {
3722 mutex_unlock(&ifmgd->mtx);
3723 return;
3724 }
3725
3726 if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
3727 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
3728 mlme_dbg(sdata, "driver requested disconnect after resume\n");
3729 ieee80211_sta_connection_lost(sdata,
3730 ifmgd->associated->bssid,
3731 WLAN_REASON_UNSPECIFIED,
3732 true);
3733 mutex_unlock(&ifmgd->mtx);
3734 return;
3735 }
3736 mutex_unlock(&ifmgd->mtx);
3737 }
3738 #endif
3739
3740 /* interface setup */
3741 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3742 {
3743 struct ieee80211_if_managed *ifmgd;
3744
3745 ifmgd = &sdata->u.mgd;
3746 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3747 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3748 INIT_WORK(&ifmgd->beacon_connection_loss_work,
3749 ieee80211_beacon_connection_loss_work);
3750 INIT_WORK(&ifmgd->csa_connection_drop_work,
3751 ieee80211_csa_connection_drop_work);
3752 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
3753 setup_timer(&ifmgd->timer, ieee80211_sta_timer,
3754 (unsigned long) sdata);
3755 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
3756 (unsigned long) sdata);
3757 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
3758 (unsigned long) sdata);
3759 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
3760 (unsigned long) sdata);
3761
3762 ifmgd->flags = 0;
3763 ifmgd->powersave = sdata->wdev.ps;
3764 ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
3765 ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
3766 ifmgd->p2p_noa_index = -1;
3767
3768 mutex_init(&ifmgd->mtx);
3769
3770 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
3771 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
3772 else
3773 ifmgd->req_smps = IEEE80211_SMPS_OFF;
3774 }
3775
3776 /* scan finished notification */
3777 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
3778 {
3779 struct ieee80211_sub_if_data *sdata;
3780
3781 /* Restart STA timers */
3782 rcu_read_lock();
3783 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3784 if (ieee80211_sdata_running(sdata))
3785 ieee80211_restart_sta_timer(sdata);
3786 }
3787 rcu_read_unlock();
3788 }
3789
3790 int ieee80211_max_network_latency(struct notifier_block *nb,
3791 unsigned long data, void *dummy)
3792 {
3793 s32 latency_usec = (s32) data;
3794 struct ieee80211_local *local =
3795 container_of(nb, struct ieee80211_local,
3796 network_latency_notifier);
3797
3798 mutex_lock(&local->iflist_mtx);
3799 ieee80211_recalc_ps(local, latency_usec);
3800 mutex_unlock(&local->iflist_mtx);
3801
3802 return 0;
3803 }
3804
3805 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
3806 struct cfg80211_bss *cbss)
3807 {
3808 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3809 const u8 *ht_cap_ie, *vht_cap_ie;
3810 const struct ieee80211_ht_cap *ht_cap;
3811 const struct ieee80211_vht_cap *vht_cap;
3812 u8 chains = 1;
3813
3814 if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
3815 return chains;
3816
3817 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
3818 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
3819 ht_cap = (void *)(ht_cap_ie + 2);
3820 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
3821 /*
3822 * TODO: use "Tx Maximum Number Spatial Streams Supported" and
3823 * "Tx Unequal Modulation Supported" fields.
3824 */
3825 }
3826
3827 if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
3828 return chains;
3829
3830 vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
3831 if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
3832 u8 nss;
3833 u16 tx_mcs_map;
3834
3835 vht_cap = (void *)(vht_cap_ie + 2);
3836 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
3837 for (nss = 8; nss > 0; nss--) {
3838 if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
3839 IEEE80211_VHT_MCS_NOT_SUPPORTED)
3840 break;
3841 }
3842 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
3843 chains = max(chains, nss);
3844 }
3845
3846 return chains;
3847 }
3848
3849 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
3850 struct cfg80211_bss *cbss)
3851 {
3852 struct ieee80211_local *local = sdata->local;
3853 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3854 const struct ieee80211_ht_operation *ht_oper = NULL;
3855 const struct ieee80211_vht_operation *vht_oper = NULL;
3856 struct ieee80211_supported_band *sband;
3857 struct cfg80211_chan_def chandef;
3858 int ret;
3859
3860 sband = local->hw.wiphy->bands[cbss->channel->band];
3861
3862 ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
3863 IEEE80211_STA_DISABLE_80P80MHZ |
3864 IEEE80211_STA_DISABLE_160MHZ);
3865
3866 rcu_read_lock();
3867
3868 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
3869 sband->ht_cap.ht_supported) {
3870 const u8 *ht_oper_ie, *ht_cap;
3871
3872 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
3873 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3874 ht_oper = (void *)(ht_oper_ie + 2);
3875
3876 ht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
3877 if (!ht_cap || ht_cap[1] < sizeof(struct ieee80211_ht_cap)) {
3878 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3879 ht_oper = NULL;
3880 }
3881 }
3882
3883 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
3884 sband->vht_cap.vht_supported) {
3885 const u8 *vht_oper_ie, *vht_cap;
3886
3887 vht_oper_ie = ieee80211_bss_get_ie(cbss,
3888 WLAN_EID_VHT_OPERATION);
3889 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
3890 vht_oper = (void *)(vht_oper_ie + 2);
3891 if (vht_oper && !ht_oper) {
3892 vht_oper = NULL;
3893 sdata_info(sdata,
3894 "AP advertised VHT without HT, disabling both\n");
3895 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3896 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3897 }
3898
3899 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
3900 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
3901 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3902 vht_oper = NULL;
3903 }
3904 }
3905
3906 ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
3907 cbss->channel,
3908 ht_oper, vht_oper,
3909 &chandef, true);
3910
3911 sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
3912 local->rx_chains);
3913
3914 rcu_read_unlock();
3915
3916 /* will change later if needed */
3917 sdata->smps_mode = IEEE80211_SMPS_OFF;
3918
3919 /*
3920 * If this fails (possibly due to channel context sharing
3921 * on incompatible channels, e.g. 80+80 and 160 sharing the
3922 * same control channel) try to use a smaller bandwidth.
3923 */
3924 ret = ieee80211_vif_use_channel(sdata, &chandef,
3925 IEEE80211_CHANCTX_SHARED);
3926 while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
3927 ifmgd->flags |= chandef_downgrade(&chandef);
3928 ret = ieee80211_vif_use_channel(sdata, &chandef,
3929 IEEE80211_CHANCTX_SHARED);
3930 }
3931 return ret;
3932 }
3933
3934 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3935 struct cfg80211_bss *cbss, bool assoc)
3936 {
3937 struct ieee80211_local *local = sdata->local;
3938 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3939 struct ieee80211_bss *bss = (void *)cbss->priv;
3940 struct sta_info *new_sta = NULL;
3941 bool have_sta = false;
3942 int err;
3943
3944 if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3945 return -EINVAL;
3946
3947 if (assoc) {
3948 rcu_read_lock();
3949 have_sta = sta_info_get(sdata, cbss->bssid);
3950 rcu_read_unlock();
3951 }
3952
3953 if (!have_sta) {
3954 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3955 if (!new_sta)
3956 return -ENOMEM;
3957 }
3958
3959 if (new_sta) {
3960 u32 rates = 0, basic_rates = 0;
3961 bool have_higher_than_11mbit;
3962 int min_rate = INT_MAX, min_rate_index = -1;
3963 struct ieee80211_supported_band *sband;
3964 const struct cfg80211_bss_ies *ies;
3965
3966 sband = local->hw.wiphy->bands[cbss->channel->band];
3967
3968 err = ieee80211_prep_channel(sdata, cbss);
3969 if (err) {
3970 sta_info_free(local, new_sta);
3971 return err;
3972 }
3973
3974 ieee80211_get_rates(sband, bss->supp_rates,
3975 bss->supp_rates_len,
3976 &rates, &basic_rates,
3977 &have_higher_than_11mbit,
3978 &min_rate, &min_rate_index);
3979
3980 /*
3981 * This used to be a workaround for basic rates missing
3982 * in the association response frame. Now that we no
3983 * longer use the basic rates from there, it probably
3984 * doesn't happen any more, but keep the workaround so
3985 * in case some *other* APs are buggy in different ways
3986 * we can connect -- with a warning.
3987 */
3988 if (!basic_rates && min_rate_index >= 0) {
3989 sdata_info(sdata,
3990 "No basic rates, using min rate instead\n");
3991 basic_rates = BIT(min_rate_index);
3992 }
3993
3994 new_sta->sta.supp_rates[cbss->channel->band] = rates;
3995 sdata->vif.bss_conf.basic_rates = basic_rates;
3996
3997 /* cf. IEEE 802.11 9.2.12 */
3998 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
3999 have_higher_than_11mbit)
4000 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
4001 else
4002 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
4003
4004 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
4005
4006 /* set timing information */
4007 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
4008 rcu_read_lock();
4009 ies = rcu_dereference(cbss->beacon_ies);
4010 if (ies) {
4011 const u8 *tim_ie;
4012
4013 sdata->vif.bss_conf.sync_tsf = ies->tsf;
4014 sdata->vif.bss_conf.sync_device_ts =
4015 bss->device_ts_beacon;
4016 tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4017 ies->data, ies->len);
4018 if (tim_ie && tim_ie[1] >= 2)
4019 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
4020 else
4021 sdata->vif.bss_conf.sync_dtim_count = 0;
4022 } else if (!(local->hw.flags &
4023 IEEE80211_HW_TIMING_BEACON_ONLY)) {
4024 ies = rcu_dereference(cbss->proberesp_ies);
4025 /* must be non-NULL since beacon IEs were NULL */
4026 sdata->vif.bss_conf.sync_tsf = ies->tsf;
4027 sdata->vif.bss_conf.sync_device_ts =
4028 bss->device_ts_presp;
4029 sdata->vif.bss_conf.sync_dtim_count = 0;
4030 } else {
4031 sdata->vif.bss_conf.sync_tsf = 0;
4032 sdata->vif.bss_conf.sync_device_ts = 0;
4033 sdata->vif.bss_conf.sync_dtim_count = 0;
4034 }
4035 rcu_read_unlock();
4036
4037 /* tell driver about BSSID, basic rates and timing */
4038 ieee80211_bss_info_change_notify(sdata,
4039 BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4040 BSS_CHANGED_BEACON_INT);
4041
4042 if (assoc)
4043 sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4044
4045 err = sta_info_insert(new_sta);
4046 new_sta = NULL;
4047 if (err) {
4048 sdata_info(sdata,
4049 "failed to insert STA entry for the AP (error %d)\n",
4050 err);
4051 return err;
4052 }
4053 } else
4054 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4055
4056 return 0;
4057 }
4058
4059 /* config hooks */
4060 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4061 struct cfg80211_auth_request *req)
4062 {
4063 struct ieee80211_local *local = sdata->local;
4064 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4065 struct ieee80211_mgd_auth_data *auth_data;
4066 u16 auth_alg;
4067 int err;
4068
4069 /* prepare auth data structure */
4070
4071 switch (req->auth_type) {
4072 case NL80211_AUTHTYPE_OPEN_SYSTEM:
4073 auth_alg = WLAN_AUTH_OPEN;
4074 break;
4075 case NL80211_AUTHTYPE_SHARED_KEY:
4076 if (IS_ERR(local->wep_tx_tfm))
4077 return -EOPNOTSUPP;
4078 auth_alg = WLAN_AUTH_SHARED_KEY;
4079 break;
4080 case NL80211_AUTHTYPE_FT:
4081 auth_alg = WLAN_AUTH_FT;
4082 break;
4083 case NL80211_AUTHTYPE_NETWORK_EAP:
4084 auth_alg = WLAN_AUTH_LEAP;
4085 break;
4086 case NL80211_AUTHTYPE_SAE:
4087 auth_alg = WLAN_AUTH_SAE;
4088 break;
4089 default:
4090 return -EOPNOTSUPP;
4091 }
4092
4093 auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
4094 req->ie_len, GFP_KERNEL);
4095 if (!auth_data)
4096 return -ENOMEM;
4097
4098 auth_data->bss = req->bss;
4099
4100 if (req->sae_data_len >= 4) {
4101 __le16 *pos = (__le16 *) req->sae_data;
4102 auth_data->sae_trans = le16_to_cpu(pos[0]);
4103 auth_data->sae_status = le16_to_cpu(pos[1]);
4104 memcpy(auth_data->data, req->sae_data + 4,
4105 req->sae_data_len - 4);
4106 auth_data->data_len += req->sae_data_len - 4;
4107 }
4108
4109 if (req->ie && req->ie_len) {
4110 memcpy(&auth_data->data[auth_data->data_len],
4111 req->ie, req->ie_len);
4112 auth_data->data_len += req->ie_len;
4113 }
4114
4115 if (req->key && req->key_len) {
4116 auth_data->key_len = req->key_len;
4117 auth_data->key_idx = req->key_idx;
4118 memcpy(auth_data->key, req->key, req->key_len);
4119 }
4120
4121 auth_data->algorithm = auth_alg;
4122
4123 /* try to authenticate/probe */
4124
4125 mutex_lock(&ifmgd->mtx);
4126
4127 if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4128 ifmgd->assoc_data) {
4129 err = -EBUSY;
4130 goto err_free;
4131 }
4132
4133 if (ifmgd->auth_data)
4134 ieee80211_destroy_auth_data(sdata, false);
4135
4136 /* prep auth_data so we don't go into idle on disassoc */
4137 ifmgd->auth_data = auth_data;
4138
4139 if (ifmgd->associated) {
4140 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4141
4142 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4143 WLAN_REASON_UNSPECIFIED,
4144 false, frame_buf);
4145
4146 __cfg80211_send_deauth(sdata->dev, frame_buf,
4147 sizeof(frame_buf));
4148 }
4149
4150 sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4151
4152 err = ieee80211_prep_connection(sdata, req->bss, false);
4153 if (err)
4154 goto err_clear;
4155
4156 err = ieee80211_probe_auth(sdata);
4157 if (err) {
4158 sta_info_destroy_addr(sdata, req->bss->bssid);
4159 goto err_clear;
4160 }
4161
4162 /* hold our own reference */
4163 cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4164 err = 0;
4165 goto out_unlock;
4166
4167 err_clear:
4168 memset(ifmgd->bssid, 0, ETH_ALEN);
4169 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4170 ifmgd->auth_data = NULL;
4171 err_free:
4172 kfree(auth_data);
4173 out_unlock:
4174 mutex_unlock(&ifmgd->mtx);
4175
4176 return err;
4177 }
4178
4179 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4180 struct cfg80211_assoc_request *req)
4181 {
4182 struct ieee80211_local *local = sdata->local;
4183 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4184 struct ieee80211_bss *bss = (void *)req->bss->priv;
4185 struct ieee80211_mgd_assoc_data *assoc_data;
4186 const struct cfg80211_bss_ies *beacon_ies;
4187 struct ieee80211_supported_band *sband;
4188 const u8 *ssidie, *ht_ie, *vht_ie;
4189 int i, err;
4190
4191 assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4192 if (!assoc_data)
4193 return -ENOMEM;
4194
4195 rcu_read_lock();
4196 ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4197 if (!ssidie) {
4198 rcu_read_unlock();
4199 kfree(assoc_data);
4200 return -EINVAL;
4201 }
4202 memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4203 assoc_data->ssid_len = ssidie[1];
4204 rcu_read_unlock();
4205
4206 mutex_lock(&ifmgd->mtx);
4207
4208 if (ifmgd->associated) {
4209 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4210
4211 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4212 WLAN_REASON_UNSPECIFIED,
4213 false, frame_buf);
4214
4215 __cfg80211_send_deauth(sdata->dev, frame_buf,
4216 sizeof(frame_buf));
4217 }
4218
4219 if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4220 err = -EBUSY;
4221 goto err_free;
4222 }
4223
4224 if (ifmgd->assoc_data) {
4225 err = -EBUSY;
4226 goto err_free;
4227 }
4228
4229 if (ifmgd->auth_data) {
4230 bool match;
4231
4232 /* keep sta info, bssid if matching */
4233 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4234 ieee80211_destroy_auth_data(sdata, match);
4235 }
4236
4237 /* prepare assoc data */
4238
4239 ifmgd->beacon_crc_valid = false;
4240
4241 /*
4242 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4243 * We still associate in non-HT mode (11a/b/g) if any one of these
4244 * ciphers is configured as pairwise.
4245 * We can set this to true for non-11n hardware, that'll be checked
4246 * separately along with the peer capabilities.
4247 */
4248 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4249 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4250 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4251 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4252 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4253 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4254 netdev_info(sdata->dev,
4255 "disabling HT/VHT due to WEP/TKIP use\n");
4256 }
4257 }
4258
4259 if (req->flags & ASSOC_REQ_DISABLE_HT) {
4260 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4261 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4262 }
4263
4264 if (req->flags & ASSOC_REQ_DISABLE_VHT)
4265 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4266
4267 /* Also disable HT if we don't support it or the AP doesn't use WMM */
4268 sband = local->hw.wiphy->bands[req->bss->channel->band];
4269 if (!sband->ht_cap.ht_supported ||
4270 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
4271 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4272 if (!bss->wmm_used)
4273 netdev_info(sdata->dev,
4274 "disabling HT as WMM/QoS is not supported by the AP\n");
4275 }
4276
4277 /* disable VHT if we don't support it or the AP doesn't use WMM */
4278 if (!sband->vht_cap.vht_supported ||
4279 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
4280 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4281 if (!bss->wmm_used)
4282 netdev_info(sdata->dev,
4283 "disabling VHT as WMM/QoS is not supported by the AP\n");
4284 }
4285
4286 memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4287 memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4288 sizeof(ifmgd->ht_capa_mask));
4289
4290 memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4291 memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4292 sizeof(ifmgd->vht_capa_mask));
4293
4294 if (req->ie && req->ie_len) {
4295 memcpy(assoc_data->ie, req->ie, req->ie_len);
4296 assoc_data->ie_len = req->ie_len;
4297 }
4298
4299 assoc_data->bss = req->bss;
4300
4301 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4302 if (ifmgd->powersave)
4303 sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4304 else
4305 sdata->smps_mode = IEEE80211_SMPS_OFF;
4306 } else
4307 sdata->smps_mode = ifmgd->req_smps;
4308
4309 assoc_data->capability = req->bss->capability;
4310 assoc_data->wmm = bss->wmm_used &&
4311 (local->hw.queues >= IEEE80211_NUM_ACS);
4312 assoc_data->supp_rates = bss->supp_rates;
4313 assoc_data->supp_rates_len = bss->supp_rates_len;
4314
4315 rcu_read_lock();
4316 ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4317 if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4318 assoc_data->ap_ht_param =
4319 ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4320 else
4321 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4322 vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4323 if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4324 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4325 sizeof(struct ieee80211_vht_cap));
4326 else
4327 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4328 rcu_read_unlock();
4329
4330 if (bss->wmm_used && bss->uapsd_supported &&
4331 (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD) &&
4332 sdata->wmm_acm != 0xff) {
4333 assoc_data->uapsd = true;
4334 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4335 } else {
4336 assoc_data->uapsd = false;
4337 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4338 }
4339
4340 if (req->prev_bssid)
4341 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4342
4343 if (req->use_mfp) {
4344 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4345 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4346 } else {
4347 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4348 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4349 }
4350
4351 if (req->crypto.control_port)
4352 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4353 else
4354 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4355
4356 sdata->control_port_protocol = req->crypto.control_port_ethertype;
4357 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4358
4359 /* kick off associate process */
4360
4361 ifmgd->assoc_data = assoc_data;
4362 ifmgd->dtim_period = 0;
4363
4364 err = ieee80211_prep_connection(sdata, req->bss, true);
4365 if (err)
4366 goto err_clear;
4367
4368 rcu_read_lock();
4369 beacon_ies = rcu_dereference(req->bss->beacon_ies);
4370
4371 if (sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC &&
4372 !beacon_ies) {
4373 /*
4374 * Wait up to one beacon interval ...
4375 * should this be more if we miss one?
4376 */
4377 sdata_info(sdata, "waiting for beacon from %pM\n",
4378 ifmgd->bssid);
4379 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4380 assoc_data->timeout_started = true;
4381 assoc_data->need_beacon = true;
4382 } else if (beacon_ies) {
4383 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4384 beacon_ies->data,
4385 beacon_ies->len);
4386 u8 dtim_count = 0;
4387
4388 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4389 const struct ieee80211_tim_ie *tim;
4390 tim = (void *)(tim_ie + 2);
4391 ifmgd->dtim_period = tim->dtim_period;
4392 dtim_count = tim->dtim_count;
4393 }
4394 assoc_data->have_beacon = true;
4395 assoc_data->timeout = jiffies;
4396 assoc_data->timeout_started = true;
4397
4398 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
4399 sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4400 sdata->vif.bss_conf.sync_device_ts =
4401 bss->device_ts_beacon;
4402 sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4403 }
4404 } else {
4405 assoc_data->timeout = jiffies;
4406 assoc_data->timeout_started = true;
4407 }
4408 rcu_read_unlock();
4409
4410 run_again(ifmgd, assoc_data->timeout);
4411
4412 if (bss->corrupt_data) {
4413 char *corrupt_type = "data";
4414 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4415 if (bss->corrupt_data &
4416 IEEE80211_BSS_CORRUPT_PROBE_RESP)
4417 corrupt_type = "beacon and probe response";
4418 else
4419 corrupt_type = "beacon";
4420 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4421 corrupt_type = "probe response";
4422 sdata_info(sdata, "associating with AP with corrupt %s\n",
4423 corrupt_type);
4424 }
4425
4426 err = 0;
4427 goto out;
4428 err_clear:
4429 memset(ifmgd->bssid, 0, ETH_ALEN);
4430 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4431 ifmgd->assoc_data = NULL;
4432 err_free:
4433 kfree(assoc_data);
4434 out:
4435 mutex_unlock(&ifmgd->mtx);
4436
4437 return err;
4438 }
4439
4440 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4441 struct cfg80211_deauth_request *req)
4442 {
4443 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4444 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4445 bool tx = !req->local_state_change;
4446 bool report_frame = false;
4447
4448 mutex_lock(&ifmgd->mtx);
4449
4450 sdata_info(sdata,
4451 "deauthenticating from %pM by local choice (reason=%d)\n",
4452 req->bssid, req->reason_code);
4453
4454 if (ifmgd->auth_data) {
4455 drv_mgd_prepare_tx(sdata->local, sdata);
4456 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4457 IEEE80211_STYPE_DEAUTH,
4458 req->reason_code, tx,
4459 frame_buf);
4460 ieee80211_destroy_auth_data(sdata, false);
4461 mutex_unlock(&ifmgd->mtx);
4462
4463 report_frame = true;
4464 goto out;
4465 }
4466
4467 if (ifmgd->associated &&
4468 ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4469 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4470 req->reason_code, tx, frame_buf);
4471 report_frame = true;
4472 }
4473 mutex_unlock(&ifmgd->mtx);
4474
4475 out:
4476 if (report_frame)
4477 __cfg80211_send_deauth(sdata->dev, frame_buf,
4478 IEEE80211_DEAUTH_FRAME_LEN);
4479
4480 return 0;
4481 }
4482
4483 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4484 struct cfg80211_disassoc_request *req)
4485 {
4486 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4487 u8 bssid[ETH_ALEN];
4488 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4489
4490 mutex_lock(&ifmgd->mtx);
4491
4492 /*
4493 * cfg80211 should catch this ... but it's racy since
4494 * we can receive a disassoc frame, process it, hand it
4495 * to cfg80211 while that's in a locked section already
4496 * trying to tell us that the user wants to disconnect.
4497 */
4498 if (ifmgd->associated != req->bss) {
4499 mutex_unlock(&ifmgd->mtx);
4500 return -ENOLINK;
4501 }
4502
4503 sdata_info(sdata,
4504 "disassociating from %pM by local choice (reason=%d)\n",
4505 req->bss->bssid, req->reason_code);
4506
4507 memcpy(bssid, req->bss->bssid, ETH_ALEN);
4508 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
4509 req->reason_code, !req->local_state_change,
4510 frame_buf);
4511 mutex_unlock(&ifmgd->mtx);
4512
4513 __cfg80211_send_disassoc(sdata->dev, frame_buf,
4514 IEEE80211_DEAUTH_FRAME_LEN);
4515
4516 return 0;
4517 }
4518
4519 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4520 {
4521 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4522
4523 /*
4524 * Make sure some work items will not run after this,
4525 * they will not do anything but might not have been
4526 * cancelled when disconnecting.
4527 */
4528 cancel_work_sync(&ifmgd->monitor_work);
4529 cancel_work_sync(&ifmgd->beacon_connection_loss_work);
4530 cancel_work_sync(&ifmgd->request_smps_work);
4531 cancel_work_sync(&ifmgd->csa_connection_drop_work);
4532 cancel_work_sync(&ifmgd->chswitch_work);
4533
4534 mutex_lock(&ifmgd->mtx);
4535 if (ifmgd->assoc_data)
4536 ieee80211_destroy_assoc_data(sdata, false);
4537 if (ifmgd->auth_data)
4538 ieee80211_destroy_auth_data(sdata, false);
4539 del_timer_sync(&ifmgd->timer);
4540 mutex_unlock(&ifmgd->mtx);
4541 }
4542
4543 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
4544 enum nl80211_cqm_rssi_threshold_event rssi_event,
4545 gfp_t gfp)
4546 {
4547 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4548
4549 trace_api_cqm_rssi_notify(sdata, rssi_event);
4550
4551 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
4552 }
4553 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
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