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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 * Copyright 2013-2014 Intel Mobile Communications GmbH
9 * Copyright (C) 2015 - 2017 Intel Deutschland GmbH
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 */
15
16 #include <linux/delay.h>
17 #include <linux/if_ether.h>
18 #include <linux/skbuff.h>
19 #include <linux/if_arp.h>
20 #include <linux/etherdevice.h>
21 #include <linux/moduleparam.h>
22 #include <linux/rtnetlink.h>
23 #include <linux/crc32.h>
24 #include <linux/slab.h>
25 #include <linux/export.h>
26 #include <net/mac80211.h>
27 #include <asm/unaligned.h>
28
29 #include "ieee80211_i.h"
30 #include "driver-ops.h"
31 #include "rate.h"
32 #include "led.h"
33 #include "fils_aead.h"
34
35 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
36 #define IEEE80211_AUTH_TIMEOUT_LONG (HZ / 2)
37 #define IEEE80211_AUTH_TIMEOUT_SHORT (HZ / 10)
38 #define IEEE80211_AUTH_MAX_TRIES 3
39 #define IEEE80211_AUTH_WAIT_ASSOC (HZ * 5)
40 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
41 #define IEEE80211_ASSOC_TIMEOUT_LONG (HZ / 2)
42 #define IEEE80211_ASSOC_TIMEOUT_SHORT (HZ / 10)
43 #define IEEE80211_ASSOC_MAX_TRIES 3
44
45 static int max_nullfunc_tries = 2;
46 module_param(max_nullfunc_tries, int, 0644);
47 MODULE_PARM_DESC(max_nullfunc_tries,
48 "Maximum nullfunc tx tries before disconnecting (reason 4).");
49
50 static int max_probe_tries = 5;
51 module_param(max_probe_tries, int, 0644);
52 MODULE_PARM_DESC(max_probe_tries,
53 "Maximum probe tries before disconnecting (reason 4).");
54
55 /*
56 * Beacon loss timeout is calculated as N frames times the
57 * advertised beacon interval. This may need to be somewhat
58 * higher than what hardware might detect to account for
59 * delays in the host processing frames. But since we also
60 * probe on beacon miss before declaring the connection lost
61 * default to what we want.
62 */
63 static int beacon_loss_count = 7;
64 module_param(beacon_loss_count, int, 0644);
65 MODULE_PARM_DESC(beacon_loss_count,
66 "Number of beacon intervals before we decide beacon was lost.");
67
68 /*
69 * Time the connection can be idle before we probe
70 * it to see if we can still talk to the AP.
71 */
72 #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ)
73 /*
74 * Time we wait for a probe response after sending
75 * a probe request because of beacon loss or for
76 * checking the connection still works.
77 */
78 static int probe_wait_ms = 500;
79 module_param(probe_wait_ms, int, 0644);
80 MODULE_PARM_DESC(probe_wait_ms,
81 "Maximum time(ms) to wait for probe response"
82 " before disconnecting (reason 4).");
83
84 /*
85 * How many Beacon frames need to have been used in average signal strength
86 * before starting to indicate signal change events.
87 */
88 #define IEEE80211_SIGNAL_AVE_MIN_COUNT 4
89
90 /*
91 * We can have multiple work items (and connection probing)
92 * scheduling this timer, but we need to take care to only
93 * reschedule it when it should fire _earlier_ than it was
94 * asked for before, or if it's not pending right now. This
95 * function ensures that. Note that it then is required to
96 * run this function for all timeouts after the first one
97 * has happened -- the work that runs from this timer will
98 * do that.
99 */
100 static void run_again(struct ieee80211_sub_if_data *sdata,
101 unsigned long timeout)
102 {
103 sdata_assert_lock(sdata);
104
105 if (!timer_pending(&sdata->u.mgd.timer) ||
106 time_before(timeout, sdata->u.mgd.timer.expires))
107 mod_timer(&sdata->u.mgd.timer, timeout);
108 }
109
110 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
111 {
112 if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
113 return;
114
115 if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
116 return;
117
118 mod_timer(&sdata->u.mgd.bcn_mon_timer,
119 round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
120 }
121
122 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
123 {
124 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
125
126 if (unlikely(!ifmgd->associated))
127 return;
128
129 if (ifmgd->probe_send_count)
130 ifmgd->probe_send_count = 0;
131
132 if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
133 return;
134
135 mod_timer(&ifmgd->conn_mon_timer,
136 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
137 }
138
139 static int ecw2cw(int ecw)
140 {
141 return (1 << ecw) - 1;
142 }
143
144 static u32
145 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
146 struct ieee80211_supported_band *sband,
147 struct ieee80211_channel *channel,
148 const struct ieee80211_ht_operation *ht_oper,
149 const struct ieee80211_vht_operation *vht_oper,
150 struct cfg80211_chan_def *chandef, bool tracking)
151 {
152 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
153 struct cfg80211_chan_def vht_chandef;
154 struct ieee80211_sta_ht_cap sta_ht_cap;
155 u32 ht_cfreq, ret;
156
157 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
158 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
159
160 chandef->chan = channel;
161 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
162 chandef->center_freq1 = channel->center_freq;
163 chandef->center_freq2 = 0;
164
165 if (!ht_oper || !sta_ht_cap.ht_supported) {
166 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
167 goto out;
168 }
169
170 chandef->width = NL80211_CHAN_WIDTH_20;
171
172 ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
173 channel->band);
174 /* check that channel matches the right operating channel */
175 if (!tracking && channel->center_freq != ht_cfreq) {
176 /*
177 * It's possible that some APs are confused here;
178 * Netgear WNDR3700 sometimes reports 4 higher than
179 * the actual channel in association responses, but
180 * since we look at probe response/beacon data here
181 * it should be OK.
182 */
183 sdata_info(sdata,
184 "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
185 channel->center_freq, ht_cfreq,
186 ht_oper->primary_chan, channel->band);
187 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
188 goto out;
189 }
190
191 /* check 40 MHz support, if we have it */
192 if (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
193 ieee80211_chandef_ht_oper(ht_oper, chandef);
194 } else {
195 /* 40 MHz (and 80 MHz) must be supported for VHT */
196 ret = IEEE80211_STA_DISABLE_VHT;
197 /* also mark 40 MHz disabled */
198 ret |= IEEE80211_STA_DISABLE_40MHZ;
199 goto out;
200 }
201
202 if (!vht_oper || !sband->vht_cap.vht_supported) {
203 ret = IEEE80211_STA_DISABLE_VHT;
204 goto out;
205 }
206
207 vht_chandef = *chandef;
208 if (!ieee80211_chandef_vht_oper(vht_oper, &vht_chandef)) {
209 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
210 sdata_info(sdata,
211 "AP VHT information is invalid, disable VHT\n");
212 ret = IEEE80211_STA_DISABLE_VHT;
213 goto out;
214 }
215
216 if (!cfg80211_chandef_valid(&vht_chandef)) {
217 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
218 sdata_info(sdata,
219 "AP VHT information is invalid, disable VHT\n");
220 ret = IEEE80211_STA_DISABLE_VHT;
221 goto out;
222 }
223
224 if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
225 ret = 0;
226 goto out;
227 }
228
229 if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
230 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
231 sdata_info(sdata,
232 "AP VHT information doesn't match HT, disable VHT\n");
233 ret = IEEE80211_STA_DISABLE_VHT;
234 goto out;
235 }
236
237 *chandef = vht_chandef;
238
239 ret = 0;
240
241 out:
242 /*
243 * When tracking the current AP, don't do any further checks if the
244 * new chandef is identical to the one we're currently using for the
245 * connection. This keeps us from playing ping-pong with regulatory,
246 * without it the following can happen (for example):
247 * - connect to an AP with 80 MHz, world regdom allows 80 MHz
248 * - AP advertises regdom US
249 * - CRDA loads regdom US with 80 MHz prohibited (old database)
250 * - the code below detects an unsupported channel, downgrades, and
251 * we disconnect from the AP in the caller
252 * - disconnect causes CRDA to reload world regdomain and the game
253 * starts anew.
254 * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
255 *
256 * It seems possible that there are still scenarios with CSA or real
257 * bandwidth changes where a this could happen, but those cases are
258 * less common and wouldn't completely prevent using the AP.
259 */
260 if (tracking &&
261 cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
262 return ret;
263
264 /* don't print the message below for VHT mismatch if VHT is disabled */
265 if (ret & IEEE80211_STA_DISABLE_VHT)
266 vht_chandef = *chandef;
267
268 /*
269 * Ignore the DISABLED flag when we're already connected and only
270 * tracking the APs beacon for bandwidth changes - otherwise we
271 * might get disconnected here if we connect to an AP, update our
272 * regulatory information based on the AP's country IE and the
273 * information we have is wrong/outdated and disables the channel
274 * that we're actually using for the connection to the AP.
275 */
276 while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
277 tracking ? 0 :
278 IEEE80211_CHAN_DISABLED)) {
279 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
280 ret = IEEE80211_STA_DISABLE_HT |
281 IEEE80211_STA_DISABLE_VHT;
282 break;
283 }
284
285 ret |= ieee80211_chandef_downgrade(chandef);
286 }
287
288 if (chandef->width != vht_chandef.width && !tracking)
289 sdata_info(sdata,
290 "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
291
292 WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
293 return ret;
294 }
295
296 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
297 struct sta_info *sta,
298 const struct ieee80211_ht_cap *ht_cap,
299 const struct ieee80211_ht_operation *ht_oper,
300 const struct ieee80211_vht_operation *vht_oper,
301 const u8 *bssid, u32 *changed)
302 {
303 struct ieee80211_local *local = sdata->local;
304 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
305 struct ieee80211_supported_band *sband;
306 struct ieee80211_channel *chan;
307 struct cfg80211_chan_def chandef;
308 u16 ht_opmode;
309 u32 flags;
310 enum ieee80211_sta_rx_bandwidth new_sta_bw;
311 int ret;
312
313 /* if HT was/is disabled, don't track any bandwidth changes */
314 if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
315 return 0;
316
317 /* don't check VHT if we associated as non-VHT station */
318 if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
319 vht_oper = NULL;
320
321 if (WARN_ON_ONCE(!sta))
322 return -EINVAL;
323
324 /*
325 * if bss configuration changed store the new one -
326 * this may be applicable even if channel is identical
327 */
328 ht_opmode = le16_to_cpu(ht_oper->operation_mode);
329 if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
330 *changed |= BSS_CHANGED_HT;
331 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
332 }
333
334 chan = sdata->vif.bss_conf.chandef.chan;
335 sband = local->hw.wiphy->bands[chan->band];
336
337 /* calculate new channel (type) based on HT/VHT operation IEs */
338 flags = ieee80211_determine_chantype(sdata, sband, chan,
339 ht_oper, vht_oper,
340 &chandef, true);
341
342 /*
343 * Downgrade the new channel if we associated with restricted
344 * capabilities. For example, if we associated as a 20 MHz STA
345 * to a 40 MHz AP (due to regulatory, capabilities or config
346 * reasons) then switching to a 40 MHz channel now won't do us
347 * any good -- we couldn't use it with the AP.
348 */
349 if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
350 chandef.width == NL80211_CHAN_WIDTH_80P80)
351 flags |= ieee80211_chandef_downgrade(&chandef);
352 if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
353 chandef.width == NL80211_CHAN_WIDTH_160)
354 flags |= ieee80211_chandef_downgrade(&chandef);
355 if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
356 chandef.width > NL80211_CHAN_WIDTH_20)
357 flags |= ieee80211_chandef_downgrade(&chandef);
358
359 if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
360 return 0;
361
362 sdata_info(sdata,
363 "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
364 ifmgd->bssid, chandef.chan->center_freq, chandef.width,
365 chandef.center_freq1, chandef.center_freq2);
366
367 if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
368 IEEE80211_STA_DISABLE_VHT |
369 IEEE80211_STA_DISABLE_40MHZ |
370 IEEE80211_STA_DISABLE_80P80MHZ |
371 IEEE80211_STA_DISABLE_160MHZ)) ||
372 !cfg80211_chandef_valid(&chandef)) {
373 sdata_info(sdata,
374 "AP %pM changed bandwidth in a way we can't support - disconnect\n",
375 ifmgd->bssid);
376 return -EINVAL;
377 }
378
379 switch (chandef.width) {
380 case NL80211_CHAN_WIDTH_20_NOHT:
381 case NL80211_CHAN_WIDTH_20:
382 new_sta_bw = IEEE80211_STA_RX_BW_20;
383 break;
384 case NL80211_CHAN_WIDTH_40:
385 new_sta_bw = IEEE80211_STA_RX_BW_40;
386 break;
387 case NL80211_CHAN_WIDTH_80:
388 new_sta_bw = IEEE80211_STA_RX_BW_80;
389 break;
390 case NL80211_CHAN_WIDTH_80P80:
391 case NL80211_CHAN_WIDTH_160:
392 new_sta_bw = IEEE80211_STA_RX_BW_160;
393 break;
394 default:
395 return -EINVAL;
396 }
397
398 if (new_sta_bw > sta->cur_max_bandwidth)
399 new_sta_bw = sta->cur_max_bandwidth;
400
401 if (new_sta_bw < sta->sta.bandwidth) {
402 sta->sta.bandwidth = new_sta_bw;
403 rate_control_rate_update(local, sband, sta,
404 IEEE80211_RC_BW_CHANGED);
405 }
406
407 ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
408 if (ret) {
409 sdata_info(sdata,
410 "AP %pM changed bandwidth to incompatible one - disconnect\n",
411 ifmgd->bssid);
412 return ret;
413 }
414
415 if (new_sta_bw > sta->sta.bandwidth) {
416 sta->sta.bandwidth = new_sta_bw;
417 rate_control_rate_update(local, sband, sta,
418 IEEE80211_RC_BW_CHANGED);
419 }
420
421 return 0;
422 }
423
424 /* frame sending functions */
425
426 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
427 struct sk_buff *skb, u8 ap_ht_param,
428 struct ieee80211_supported_band *sband,
429 struct ieee80211_channel *channel,
430 enum ieee80211_smps_mode smps)
431 {
432 u8 *pos;
433 u32 flags = channel->flags;
434 u16 cap;
435 struct ieee80211_sta_ht_cap ht_cap;
436
437 BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
438
439 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
440 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
441
442 /* determine capability flags */
443 cap = ht_cap.cap;
444
445 switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
446 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
447 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
448 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
449 cap &= ~IEEE80211_HT_CAP_SGI_40;
450 }
451 break;
452 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
453 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
454 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
455 cap &= ~IEEE80211_HT_CAP_SGI_40;
456 }
457 break;
458 }
459
460 /*
461 * If 40 MHz was disabled associate as though we weren't
462 * capable of 40 MHz -- some broken APs will never fall
463 * back to trying to transmit in 20 MHz.
464 */
465 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
466 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
467 cap &= ~IEEE80211_HT_CAP_SGI_40;
468 }
469
470 /* set SM PS mode properly */
471 cap &= ~IEEE80211_HT_CAP_SM_PS;
472 switch (smps) {
473 case IEEE80211_SMPS_AUTOMATIC:
474 case IEEE80211_SMPS_NUM_MODES:
475 WARN_ON(1);
476 /* fall through */
477 case IEEE80211_SMPS_OFF:
478 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
479 IEEE80211_HT_CAP_SM_PS_SHIFT;
480 break;
481 case IEEE80211_SMPS_STATIC:
482 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
483 IEEE80211_HT_CAP_SM_PS_SHIFT;
484 break;
485 case IEEE80211_SMPS_DYNAMIC:
486 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
487 IEEE80211_HT_CAP_SM_PS_SHIFT;
488 break;
489 }
490
491 /* reserve and fill IE */
492 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
493 ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
494 }
495
496 /* This function determines vht capability flags for the association
497 * and builds the IE.
498 * Note - the function may set the owner of the MU-MIMO capability
499 */
500 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
501 struct sk_buff *skb,
502 struct ieee80211_supported_band *sband,
503 struct ieee80211_vht_cap *ap_vht_cap)
504 {
505 struct ieee80211_local *local = sdata->local;
506 u8 *pos;
507 u32 cap;
508 struct ieee80211_sta_vht_cap vht_cap;
509 u32 mask, ap_bf_sts, our_bf_sts;
510
511 BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
512
513 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
514 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
515
516 /* determine capability flags */
517 cap = vht_cap.cap;
518
519 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
520 u32 bw = cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
521
522 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
523 if (bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ ||
524 bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
525 cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
526 }
527
528 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
529 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
530 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
531 }
532
533 /*
534 * Some APs apparently get confused if our capabilities are better
535 * than theirs, so restrict what we advertise in the assoc request.
536 */
537 if (!(ap_vht_cap->vht_cap_info &
538 cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
539 cap &= ~(IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
540 IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE);
541 else if (!(ap_vht_cap->vht_cap_info &
542 cpu_to_le32(IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE)))
543 cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
544
545 /*
546 * If some other vif is using the MU-MIMO capablity we cannot associate
547 * using MU-MIMO - this will lead to contradictions in the group-id
548 * mechanism.
549 * Ownership is defined since association request, in order to avoid
550 * simultaneous associations with MU-MIMO.
551 */
552 if (cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE) {
553 bool disable_mu_mimo = false;
554 struct ieee80211_sub_if_data *other;
555
556 list_for_each_entry_rcu(other, &local->interfaces, list) {
557 if (other->vif.mu_mimo_owner) {
558 disable_mu_mimo = true;
559 break;
560 }
561 }
562 if (disable_mu_mimo)
563 cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
564 else
565 sdata->vif.mu_mimo_owner = true;
566 }
567
568 mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
569
570 ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask;
571 our_bf_sts = cap & mask;
572
573 if (ap_bf_sts < our_bf_sts) {
574 cap &= ~mask;
575 cap |= ap_bf_sts;
576 }
577
578 /* reserve and fill IE */
579 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
580 ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
581 }
582
583 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
584 {
585 struct ieee80211_local *local = sdata->local;
586 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
587 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
588 struct sk_buff *skb;
589 struct ieee80211_mgmt *mgmt;
590 u8 *pos, qos_info;
591 size_t offset = 0, noffset;
592 int i, count, rates_len, supp_rates_len, shift;
593 u16 capab;
594 struct ieee80211_supported_band *sband;
595 struct ieee80211_chanctx_conf *chanctx_conf;
596 struct ieee80211_channel *chan;
597 u32 rates = 0;
598
599 sdata_assert_lock(sdata);
600
601 rcu_read_lock();
602 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
603 if (WARN_ON(!chanctx_conf)) {
604 rcu_read_unlock();
605 return;
606 }
607 chan = chanctx_conf->def.chan;
608 rcu_read_unlock();
609 sband = local->hw.wiphy->bands[chan->band];
610 shift = ieee80211_vif_get_shift(&sdata->vif);
611
612 if (assoc_data->supp_rates_len) {
613 /*
614 * Get all rates supported by the device and the AP as
615 * some APs don't like getting a superset of their rates
616 * in the association request (e.g. D-Link DAP 1353 in
617 * b-only mode)...
618 */
619 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
620 assoc_data->supp_rates,
621 assoc_data->supp_rates_len,
622 &rates);
623 } else {
624 /*
625 * In case AP not provide any supported rates information
626 * before association, we send information element(s) with
627 * all rates that we support.
628 */
629 rates_len = 0;
630 for (i = 0; i < sband->n_bitrates; i++) {
631 rates |= BIT(i);
632 rates_len++;
633 }
634 }
635
636 skb = alloc_skb(local->hw.extra_tx_headroom +
637 sizeof(*mgmt) + /* bit too much but doesn't matter */
638 2 + assoc_data->ssid_len + /* SSID */
639 4 + rates_len + /* (extended) rates */
640 4 + /* power capability */
641 2 + 2 * sband->n_channels + /* supported channels */
642 2 + sizeof(struct ieee80211_ht_cap) + /* HT */
643 2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
644 assoc_data->ie_len + /* extra IEs */
645 (assoc_data->fils_kek_len ? 16 /* AES-SIV */ : 0) +
646 9, /* WMM */
647 GFP_KERNEL);
648 if (!skb)
649 return;
650
651 skb_reserve(skb, local->hw.extra_tx_headroom);
652
653 capab = WLAN_CAPABILITY_ESS;
654
655 if (sband->band == NL80211_BAND_2GHZ) {
656 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
657 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
658 }
659
660 if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
661 capab |= WLAN_CAPABILITY_PRIVACY;
662
663 if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
664 ieee80211_hw_check(&local->hw, SPECTRUM_MGMT))
665 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
666
667 if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM)
668 capab |= WLAN_CAPABILITY_RADIO_MEASURE;
669
670 mgmt = skb_put_zero(skb, 24);
671 memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
672 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
673 memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
674
675 if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
676 skb_put(skb, 10);
677 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
678 IEEE80211_STYPE_REASSOC_REQ);
679 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
680 mgmt->u.reassoc_req.listen_interval =
681 cpu_to_le16(local->hw.conf.listen_interval);
682 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
683 ETH_ALEN);
684 } else {
685 skb_put(skb, 4);
686 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
687 IEEE80211_STYPE_ASSOC_REQ);
688 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
689 mgmt->u.assoc_req.listen_interval =
690 cpu_to_le16(local->hw.conf.listen_interval);
691 }
692
693 /* SSID */
694 pos = skb_put(skb, 2 + assoc_data->ssid_len);
695 *pos++ = WLAN_EID_SSID;
696 *pos++ = assoc_data->ssid_len;
697 memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
698
699 /* add all rates which were marked to be used above */
700 supp_rates_len = rates_len;
701 if (supp_rates_len > 8)
702 supp_rates_len = 8;
703
704 pos = skb_put(skb, supp_rates_len + 2);
705 *pos++ = WLAN_EID_SUPP_RATES;
706 *pos++ = supp_rates_len;
707
708 count = 0;
709 for (i = 0; i < sband->n_bitrates; i++) {
710 if (BIT(i) & rates) {
711 int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
712 5 * (1 << shift));
713 *pos++ = (u8) rate;
714 if (++count == 8)
715 break;
716 }
717 }
718
719 if (rates_len > count) {
720 pos = skb_put(skb, rates_len - count + 2);
721 *pos++ = WLAN_EID_EXT_SUPP_RATES;
722 *pos++ = rates_len - count;
723
724 for (i++; i < sband->n_bitrates; i++) {
725 if (BIT(i) & rates) {
726 int rate;
727 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
728 5 * (1 << shift));
729 *pos++ = (u8) rate;
730 }
731 }
732 }
733
734 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT ||
735 capab & WLAN_CAPABILITY_RADIO_MEASURE) {
736 pos = skb_put(skb, 4);
737 *pos++ = WLAN_EID_PWR_CAPABILITY;
738 *pos++ = 2;
739 *pos++ = 0; /* min tx power */
740 /* max tx power */
741 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
742 }
743
744 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
745 /* TODO: get this in reg domain format */
746 pos = skb_put(skb, 2 * sband->n_channels + 2);
747 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
748 *pos++ = 2 * sband->n_channels;
749 for (i = 0; i < sband->n_channels; i++) {
750 *pos++ = ieee80211_frequency_to_channel(
751 sband->channels[i].center_freq);
752 *pos++ = 1; /* one channel in the subband*/
753 }
754 }
755
756 /* if present, add any custom IEs that go before HT */
757 if (assoc_data->ie_len) {
758 static const u8 before_ht[] = {
759 WLAN_EID_SSID,
760 WLAN_EID_SUPP_RATES,
761 WLAN_EID_EXT_SUPP_RATES,
762 WLAN_EID_PWR_CAPABILITY,
763 WLAN_EID_SUPPORTED_CHANNELS,
764 WLAN_EID_RSN,
765 WLAN_EID_QOS_CAPA,
766 WLAN_EID_RRM_ENABLED_CAPABILITIES,
767 WLAN_EID_MOBILITY_DOMAIN,
768 WLAN_EID_FAST_BSS_TRANSITION, /* reassoc only */
769 WLAN_EID_RIC_DATA, /* reassoc only */
770 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
771 };
772 static const u8 after_ric[] = {
773 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
774 WLAN_EID_HT_CAPABILITY,
775 WLAN_EID_BSS_COEX_2040,
776 /* luckily this is almost always there */
777 WLAN_EID_EXT_CAPABILITY,
778 WLAN_EID_QOS_TRAFFIC_CAPA,
779 WLAN_EID_TIM_BCAST_REQ,
780 WLAN_EID_INTERWORKING,
781 /* 60 GHz (Multi-band, DMG, MMS) can't happen */
782 WLAN_EID_VHT_CAPABILITY,
783 WLAN_EID_OPMODE_NOTIF,
784 };
785
786 noffset = ieee80211_ie_split_ric(assoc_data->ie,
787 assoc_data->ie_len,
788 before_ht,
789 ARRAY_SIZE(before_ht),
790 after_ric,
791 ARRAY_SIZE(after_ric),
792 offset);
793 skb_put_data(skb, assoc_data->ie + offset, noffset - offset);
794 offset = noffset;
795 }
796
797 if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
798 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
799 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
800
801 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
802 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
803 sband, chan, sdata->smps_mode);
804
805 /* if present, add any custom IEs that go before VHT */
806 if (assoc_data->ie_len) {
807 static const u8 before_vht[] = {
808 /*
809 * no need to list the ones split off before HT
810 * or generated here
811 */
812 WLAN_EID_BSS_COEX_2040,
813 WLAN_EID_EXT_CAPABILITY,
814 WLAN_EID_QOS_TRAFFIC_CAPA,
815 WLAN_EID_TIM_BCAST_REQ,
816 WLAN_EID_INTERWORKING,
817 /* 60 GHz (Multi-band, DMG, MMS) can't happen */
818 };
819
820 /* RIC already taken above, so no need to handle here anymore */
821 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
822 before_vht, ARRAY_SIZE(before_vht),
823 offset);
824 skb_put_data(skb, assoc_data->ie + offset, noffset - offset);
825 offset = noffset;
826 }
827
828 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
829 ieee80211_add_vht_ie(sdata, skb, sband,
830 &assoc_data->ap_vht_cap);
831
832 /* if present, add any custom non-vendor IEs that go after HT */
833 if (assoc_data->ie_len) {
834 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
835 assoc_data->ie_len,
836 offset);
837 skb_put_data(skb, assoc_data->ie + offset, noffset - offset);
838 offset = noffset;
839 }
840
841 if (assoc_data->wmm) {
842 if (assoc_data->uapsd) {
843 qos_info = ifmgd->uapsd_queues;
844 qos_info |= (ifmgd->uapsd_max_sp_len <<
845 IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
846 } else {
847 qos_info = 0;
848 }
849
850 pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
851 }
852
853 /* add any remaining custom (i.e. vendor specific here) IEs */
854 if (assoc_data->ie_len) {
855 noffset = assoc_data->ie_len;
856 skb_put_data(skb, assoc_data->ie + offset, noffset - offset);
857 }
858
859 if (assoc_data->fils_kek_len &&
860 fils_encrypt_assoc_req(skb, assoc_data) < 0) {
861 dev_kfree_skb(skb);
862 return;
863 }
864
865 drv_mgd_prepare_tx(local, sdata);
866
867 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
868 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
869 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
870 IEEE80211_TX_INTFL_MLME_CONN_TX;
871 ieee80211_tx_skb(sdata, skb);
872 }
873
874 void ieee80211_send_pspoll(struct ieee80211_local *local,
875 struct ieee80211_sub_if_data *sdata)
876 {
877 struct ieee80211_pspoll *pspoll;
878 struct sk_buff *skb;
879
880 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
881 if (!skb)
882 return;
883
884 pspoll = (struct ieee80211_pspoll *) skb->data;
885 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
886
887 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
888 ieee80211_tx_skb(sdata, skb);
889 }
890
891 void ieee80211_send_nullfunc(struct ieee80211_local *local,
892 struct ieee80211_sub_if_data *sdata,
893 bool powersave)
894 {
895 struct sk_buff *skb;
896 struct ieee80211_hdr_3addr *nullfunc;
897 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
898
899 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif, true);
900 if (!skb)
901 return;
902
903 nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
904 if (powersave)
905 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
906
907 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
908 IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
909
910 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
911 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
912
913 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
914 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
915
916 ieee80211_tx_skb(sdata, skb);
917 }
918
919 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
920 struct ieee80211_sub_if_data *sdata)
921 {
922 struct sk_buff *skb;
923 struct ieee80211_hdr *nullfunc;
924 __le16 fc;
925
926 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
927 return;
928
929 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
930 if (!skb)
931 return;
932
933 skb_reserve(skb, local->hw.extra_tx_headroom);
934
935 nullfunc = skb_put_zero(skb, 30);
936 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
937 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
938 nullfunc->frame_control = fc;
939 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
940 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
941 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
942 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
943
944 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
945 ieee80211_tx_skb(sdata, skb);
946 }
947
948 /* spectrum management related things */
949 static void ieee80211_chswitch_work(struct work_struct *work)
950 {
951 struct ieee80211_sub_if_data *sdata =
952 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
953 struct ieee80211_local *local = sdata->local;
954 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
955 int ret;
956
957 if (!ieee80211_sdata_running(sdata))
958 return;
959
960 sdata_lock(sdata);
961 mutex_lock(&local->mtx);
962 mutex_lock(&local->chanctx_mtx);
963
964 if (!ifmgd->associated)
965 goto out;
966
967 if (!sdata->vif.csa_active)
968 goto out;
969
970 /*
971 * using reservation isn't immediate as it may be deferred until later
972 * with multi-vif. once reservation is complete it will re-schedule the
973 * work with no reserved_chanctx so verify chandef to check if it
974 * completed successfully
975 */
976
977 if (sdata->reserved_chanctx) {
978 /*
979 * with multi-vif csa driver may call ieee80211_csa_finish()
980 * many times while waiting for other interfaces to use their
981 * reservations
982 */
983 if (sdata->reserved_ready)
984 goto out;
985
986 ret = ieee80211_vif_use_reserved_context(sdata);
987 if (ret) {
988 sdata_info(sdata,
989 "failed to use reserved channel context, disconnecting (err=%d)\n",
990 ret);
991 ieee80211_queue_work(&sdata->local->hw,
992 &ifmgd->csa_connection_drop_work);
993 goto out;
994 }
995
996 goto out;
997 }
998
999 if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
1000 &sdata->csa_chandef)) {
1001 sdata_info(sdata,
1002 "failed to finalize channel switch, disconnecting\n");
1003 ieee80211_queue_work(&sdata->local->hw,
1004 &ifmgd->csa_connection_drop_work);
1005 goto out;
1006 }
1007
1008 /* XXX: shouldn't really modify cfg80211-owned data! */
1009 ifmgd->associated->channel = sdata->csa_chandef.chan;
1010
1011 ifmgd->csa_waiting_bcn = true;
1012
1013 ieee80211_sta_reset_beacon_monitor(sdata);
1014 ieee80211_sta_reset_conn_monitor(sdata);
1015
1016 out:
1017 mutex_unlock(&local->chanctx_mtx);
1018 mutex_unlock(&local->mtx);
1019 sdata_unlock(sdata);
1020 }
1021
1022 static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata)
1023 {
1024 struct ieee80211_local *local = sdata->local;
1025 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1026 int ret;
1027
1028 sdata_assert_lock(sdata);
1029
1030 WARN_ON(!sdata->vif.csa_active);
1031
1032 if (sdata->csa_block_tx) {
1033 ieee80211_wake_vif_queues(local, sdata,
1034 IEEE80211_QUEUE_STOP_REASON_CSA);
1035 sdata->csa_block_tx = false;
1036 }
1037
1038 sdata->vif.csa_active = false;
1039 ifmgd->csa_waiting_bcn = false;
1040
1041 ret = drv_post_channel_switch(sdata);
1042 if (ret) {
1043 sdata_info(sdata,
1044 "driver post channel switch failed, disconnecting\n");
1045 ieee80211_queue_work(&local->hw,
1046 &ifmgd->csa_connection_drop_work);
1047 return;
1048 }
1049
1050 cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef);
1051 }
1052
1053 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
1054 {
1055 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1056 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1057
1058 trace_api_chswitch_done(sdata, success);
1059 if (!success) {
1060 sdata_info(sdata,
1061 "driver channel switch failed, disconnecting\n");
1062 ieee80211_queue_work(&sdata->local->hw,
1063 &ifmgd->csa_connection_drop_work);
1064 } else {
1065 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1066 }
1067 }
1068 EXPORT_SYMBOL(ieee80211_chswitch_done);
1069
1070 static void ieee80211_chswitch_timer(struct timer_list *t)
1071 {
1072 struct ieee80211_sub_if_data *sdata =
1073 from_timer(sdata, t, u.mgd.chswitch_timer);
1074
1075 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1076 }
1077
1078 static void
1079 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1080 u64 timestamp, u32 device_timestamp,
1081 struct ieee802_11_elems *elems,
1082 bool beacon)
1083 {
1084 struct ieee80211_local *local = sdata->local;
1085 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1086 struct cfg80211_bss *cbss = ifmgd->associated;
1087 struct ieee80211_chanctx_conf *conf;
1088 struct ieee80211_chanctx *chanctx;
1089 enum nl80211_band current_band;
1090 struct ieee80211_csa_ie csa_ie;
1091 struct ieee80211_channel_switch ch_switch;
1092 int res;
1093
1094 sdata_assert_lock(sdata);
1095
1096 if (!cbss)
1097 return;
1098
1099 if (local->scanning)
1100 return;
1101
1102 /* disregard subsequent announcements if we are already processing */
1103 if (sdata->vif.csa_active)
1104 return;
1105
1106 current_band = cbss->channel->band;
1107 res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
1108 ifmgd->flags,
1109 ifmgd->associated->bssid, &csa_ie);
1110 if (res < 0)
1111 ieee80211_queue_work(&local->hw,
1112 &ifmgd->csa_connection_drop_work);
1113 if (res)
1114 return;
1115
1116 if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1117 IEEE80211_CHAN_DISABLED)) {
1118 sdata_info(sdata,
1119 "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1120 ifmgd->associated->bssid,
1121 csa_ie.chandef.chan->center_freq,
1122 csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1123 csa_ie.chandef.center_freq2);
1124 ieee80211_queue_work(&local->hw,
1125 &ifmgd->csa_connection_drop_work);
1126 return;
1127 }
1128
1129 if (cfg80211_chandef_identical(&csa_ie.chandef,
1130 &sdata->vif.bss_conf.chandef)) {
1131 if (ifmgd->csa_ignored_same_chan)
1132 return;
1133 sdata_info(sdata,
1134 "AP %pM tries to chanswitch to same channel, ignore\n",
1135 ifmgd->associated->bssid);
1136 ifmgd->csa_ignored_same_chan = true;
1137 return;
1138 }
1139
1140 /*
1141 * Drop all TDLS peers - either we disconnect or move to a different
1142 * channel from this point on. There's no telling what our peer will do.
1143 * The TDLS WIDER_BW scenario is also problematic, as peers might now
1144 * have an incompatible wider chandef.
1145 */
1146 ieee80211_teardown_tdls_peers(sdata);
1147
1148 mutex_lock(&local->mtx);
1149 mutex_lock(&local->chanctx_mtx);
1150 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1151 lockdep_is_held(&local->chanctx_mtx));
1152 if (!conf) {
1153 sdata_info(sdata,
1154 "no channel context assigned to vif?, disconnecting\n");
1155 goto drop_connection;
1156 }
1157
1158 chanctx = container_of(conf, struct ieee80211_chanctx, conf);
1159
1160 if (local->use_chanctx &&
1161 !ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA)) {
1162 sdata_info(sdata,
1163 "driver doesn't support chan-switch with channel contexts\n");
1164 goto drop_connection;
1165 }
1166
1167 ch_switch.timestamp = timestamp;
1168 ch_switch.device_timestamp = device_timestamp;
1169 ch_switch.block_tx = csa_ie.mode;
1170 ch_switch.chandef = csa_ie.chandef;
1171 ch_switch.count = csa_ie.count;
1172
1173 if (drv_pre_channel_switch(sdata, &ch_switch)) {
1174 sdata_info(sdata,
1175 "preparing for channel switch failed, disconnecting\n");
1176 goto drop_connection;
1177 }
1178
1179 res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
1180 chanctx->mode, false);
1181 if (res) {
1182 sdata_info(sdata,
1183 "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
1184 res);
1185 goto drop_connection;
1186 }
1187 mutex_unlock(&local->chanctx_mtx);
1188
1189 sdata->vif.csa_active = true;
1190 sdata->csa_chandef = csa_ie.chandef;
1191 sdata->csa_block_tx = csa_ie.mode;
1192 ifmgd->csa_ignored_same_chan = false;
1193
1194 if (sdata->csa_block_tx)
1195 ieee80211_stop_vif_queues(local, sdata,
1196 IEEE80211_QUEUE_STOP_REASON_CSA);
1197 mutex_unlock(&local->mtx);
1198
1199 cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
1200 csa_ie.count);
1201
1202 if (local->ops->channel_switch) {
1203 /* use driver's channel switch callback */
1204 drv_channel_switch(local, sdata, &ch_switch);
1205 return;
1206 }
1207
1208 /* channel switch handled in software */
1209 if (csa_ie.count <= 1)
1210 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1211 else
1212 mod_timer(&ifmgd->chswitch_timer,
1213 TU_TO_EXP_TIME((csa_ie.count - 1) *
1214 cbss->beacon_interval));
1215 return;
1216 drop_connection:
1217 ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work);
1218 mutex_unlock(&local->chanctx_mtx);
1219 mutex_unlock(&local->mtx);
1220 }
1221
1222 static bool
1223 ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
1224 struct ieee80211_channel *channel,
1225 const u8 *country_ie, u8 country_ie_len,
1226 const u8 *pwr_constr_elem,
1227 int *chan_pwr, int *pwr_reduction)
1228 {
1229 struct ieee80211_country_ie_triplet *triplet;
1230 int chan = ieee80211_frequency_to_channel(channel->center_freq);
1231 int i, chan_increment;
1232 bool have_chan_pwr = false;
1233
1234 /* Invalid IE */
1235 if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1236 return false;
1237
1238 triplet = (void *)(country_ie + 3);
1239 country_ie_len -= 3;
1240
1241 switch (channel->band) {
1242 default:
1243 WARN_ON_ONCE(1);
1244 /* fall through */
1245 case NL80211_BAND_2GHZ:
1246 case NL80211_BAND_60GHZ:
1247 chan_increment = 1;
1248 break;
1249 case NL80211_BAND_5GHZ:
1250 chan_increment = 4;
1251 break;
1252 }
1253
1254 /* find channel */
1255 while (country_ie_len >= 3) {
1256 u8 first_channel = triplet->chans.first_channel;
1257
1258 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1259 goto next;
1260
1261 for (i = 0; i < triplet->chans.num_channels; i++) {
1262 if (first_channel + i * chan_increment == chan) {
1263 have_chan_pwr = true;
1264 *chan_pwr = triplet->chans.max_power;
1265 break;
1266 }
1267 }
1268 if (have_chan_pwr)
1269 break;
1270
1271 next:
1272 triplet++;
1273 country_ie_len -= 3;
1274 }
1275
1276 if (have_chan_pwr && pwr_constr_elem)
1277 *pwr_reduction = *pwr_constr_elem;
1278 else
1279 *pwr_reduction = 0;
1280
1281 return have_chan_pwr;
1282 }
1283
1284 static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata,
1285 struct ieee80211_channel *channel,
1286 const u8 *cisco_dtpc_ie,
1287 int *pwr_level)
1288 {
1289 /* From practical testing, the first data byte of the DTPC element
1290 * seems to contain the requested dBm level, and the CLI on Cisco
1291 * APs clearly state the range is -127 to 127 dBm, which indicates
1292 * a signed byte, although it seemingly never actually goes negative.
1293 * The other byte seems to always be zero.
1294 */
1295 *pwr_level = (__s8)cisco_dtpc_ie[4];
1296 }
1297
1298 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1299 struct ieee80211_channel *channel,
1300 struct ieee80211_mgmt *mgmt,
1301 const u8 *country_ie, u8 country_ie_len,
1302 const u8 *pwr_constr_ie,
1303 const u8 *cisco_dtpc_ie)
1304 {
1305 bool has_80211h_pwr = false, has_cisco_pwr = false;
1306 int chan_pwr = 0, pwr_reduction_80211h = 0;
1307 int pwr_level_cisco, pwr_level_80211h;
1308 int new_ap_level;
1309 __le16 capab = mgmt->u.probe_resp.capab_info;
1310
1311 if (country_ie &&
1312 (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) ||
1313 capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) {
1314 has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
1315 sdata, channel, country_ie, country_ie_len,
1316 pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1317 pwr_level_80211h =
1318 max_t(int, 0, chan_pwr - pwr_reduction_80211h);
1319 }
1320
1321 if (cisco_dtpc_ie) {
1322 ieee80211_find_cisco_dtpc(
1323 sdata, channel, cisco_dtpc_ie, &pwr_level_cisco);
1324 has_cisco_pwr = true;
1325 }
1326
1327 if (!has_80211h_pwr && !has_cisco_pwr)
1328 return 0;
1329
1330 /* If we have both 802.11h and Cisco DTPC, apply both limits
1331 * by picking the smallest of the two power levels advertised.
1332 */
1333 if (has_80211h_pwr &&
1334 (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) {
1335 new_ap_level = pwr_level_80211h;
1336
1337 if (sdata->ap_power_level == new_ap_level)
1338 return 0;
1339
1340 sdata_dbg(sdata,
1341 "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1342 pwr_level_80211h, chan_pwr, pwr_reduction_80211h,
1343 sdata->u.mgd.bssid);
1344 } else { /* has_cisco_pwr is always true here. */
1345 new_ap_level = pwr_level_cisco;
1346
1347 if (sdata->ap_power_level == new_ap_level)
1348 return 0;
1349
1350 sdata_dbg(sdata,
1351 "Limiting TX power to %d dBm as advertised by %pM\n",
1352 pwr_level_cisco, sdata->u.mgd.bssid);
1353 }
1354
1355 sdata->ap_power_level = new_ap_level;
1356 if (__ieee80211_recalc_txpower(sdata))
1357 return BSS_CHANGED_TXPOWER;
1358 return 0;
1359 }
1360
1361 /* powersave */
1362 static void ieee80211_enable_ps(struct ieee80211_local *local,
1363 struct ieee80211_sub_if_data *sdata)
1364 {
1365 struct ieee80211_conf *conf = &local->hw.conf;
1366
1367 /*
1368 * If we are scanning right now then the parameters will
1369 * take effect when scan finishes.
1370 */
1371 if (local->scanning)
1372 return;
1373
1374 if (conf->dynamic_ps_timeout > 0 &&
1375 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) {
1376 mod_timer(&local->dynamic_ps_timer, jiffies +
1377 msecs_to_jiffies(conf->dynamic_ps_timeout));
1378 } else {
1379 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
1380 ieee80211_send_nullfunc(local, sdata, true);
1381
1382 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1383 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
1384 return;
1385
1386 conf->flags |= IEEE80211_CONF_PS;
1387 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1388 }
1389 }
1390
1391 static void ieee80211_change_ps(struct ieee80211_local *local)
1392 {
1393 struct ieee80211_conf *conf = &local->hw.conf;
1394
1395 if (local->ps_sdata) {
1396 ieee80211_enable_ps(local, local->ps_sdata);
1397 } else if (conf->flags & IEEE80211_CONF_PS) {
1398 conf->flags &= ~IEEE80211_CONF_PS;
1399 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1400 del_timer_sync(&local->dynamic_ps_timer);
1401 cancel_work_sync(&local->dynamic_ps_enable_work);
1402 }
1403 }
1404
1405 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1406 {
1407 struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1408 struct sta_info *sta = NULL;
1409 bool authorized = false;
1410
1411 if (!mgd->powersave)
1412 return false;
1413
1414 if (mgd->broken_ap)
1415 return false;
1416
1417 if (!mgd->associated)
1418 return false;
1419
1420 if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1421 return false;
1422
1423 if (!mgd->have_beacon)
1424 return false;
1425
1426 rcu_read_lock();
1427 sta = sta_info_get(sdata, mgd->bssid);
1428 if (sta)
1429 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1430 rcu_read_unlock();
1431
1432 return authorized;
1433 }
1434
1435 /* need to hold RTNL or interface lock */
1436 void ieee80211_recalc_ps(struct ieee80211_local *local)
1437 {
1438 struct ieee80211_sub_if_data *sdata, *found = NULL;
1439 int count = 0;
1440 int timeout;
1441
1442 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) {
1443 local->ps_sdata = NULL;
1444 return;
1445 }
1446
1447 list_for_each_entry(sdata, &local->interfaces, list) {
1448 if (!ieee80211_sdata_running(sdata))
1449 continue;
1450 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1451 /* If an AP vif is found, then disable PS
1452 * by setting the count to zero thereby setting
1453 * ps_sdata to NULL.
1454 */
1455 count = 0;
1456 break;
1457 }
1458 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1459 continue;
1460 found = sdata;
1461 count++;
1462 }
1463
1464 if (count == 1 && ieee80211_powersave_allowed(found)) {
1465 u8 dtimper = found->u.mgd.dtim_period;
1466
1467 timeout = local->dynamic_ps_forced_timeout;
1468 if (timeout < 0)
1469 timeout = 100;
1470 local->hw.conf.dynamic_ps_timeout = timeout;
1471
1472 /* If the TIM IE is invalid, pretend the value is 1 */
1473 if (!dtimper)
1474 dtimper = 1;
1475
1476 local->hw.conf.ps_dtim_period = dtimper;
1477 local->ps_sdata = found;
1478 } else {
1479 local->ps_sdata = NULL;
1480 }
1481
1482 ieee80211_change_ps(local);
1483 }
1484
1485 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1486 {
1487 bool ps_allowed = ieee80211_powersave_allowed(sdata);
1488
1489 if (sdata->vif.bss_conf.ps != ps_allowed) {
1490 sdata->vif.bss_conf.ps = ps_allowed;
1491 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1492 }
1493 }
1494
1495 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1496 {
1497 struct ieee80211_local *local =
1498 container_of(work, struct ieee80211_local,
1499 dynamic_ps_disable_work);
1500
1501 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1502 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1503 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1504 }
1505
1506 ieee80211_wake_queues_by_reason(&local->hw,
1507 IEEE80211_MAX_QUEUE_MAP,
1508 IEEE80211_QUEUE_STOP_REASON_PS,
1509 false);
1510 }
1511
1512 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1513 {
1514 struct ieee80211_local *local =
1515 container_of(work, struct ieee80211_local,
1516 dynamic_ps_enable_work);
1517 struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1518 struct ieee80211_if_managed *ifmgd;
1519 unsigned long flags;
1520 int q;
1521
1522 /* can only happen when PS was just disabled anyway */
1523 if (!sdata)
1524 return;
1525
1526 ifmgd = &sdata->u.mgd;
1527
1528 if (local->hw.conf.flags & IEEE80211_CONF_PS)
1529 return;
1530
1531 if (local->hw.conf.dynamic_ps_timeout > 0) {
1532 /* don't enter PS if TX frames are pending */
1533 if (drv_tx_frames_pending(local)) {
1534 mod_timer(&local->dynamic_ps_timer, jiffies +
1535 msecs_to_jiffies(
1536 local->hw.conf.dynamic_ps_timeout));
1537 return;
1538 }
1539
1540 /*
1541 * transmission can be stopped by others which leads to
1542 * dynamic_ps_timer expiry. Postpone the ps timer if it
1543 * is not the actual idle state.
1544 */
1545 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1546 for (q = 0; q < local->hw.queues; q++) {
1547 if (local->queue_stop_reasons[q]) {
1548 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1549 flags);
1550 mod_timer(&local->dynamic_ps_timer, jiffies +
1551 msecs_to_jiffies(
1552 local->hw.conf.dynamic_ps_timeout));
1553 return;
1554 }
1555 }
1556 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1557 }
1558
1559 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1560 !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1561 if (drv_tx_frames_pending(local)) {
1562 mod_timer(&local->dynamic_ps_timer, jiffies +
1563 msecs_to_jiffies(
1564 local->hw.conf.dynamic_ps_timeout));
1565 } else {
1566 ieee80211_send_nullfunc(local, sdata, true);
1567 /* Flush to get the tx status of nullfunc frame */
1568 ieee80211_flush_queues(local, sdata, false);
1569 }
1570 }
1571
1572 if (!(ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
1573 ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) ||
1574 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1575 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1576 local->hw.conf.flags |= IEEE80211_CONF_PS;
1577 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1578 }
1579 }
1580
1581 void ieee80211_dynamic_ps_timer(struct timer_list *t)
1582 {
1583 struct ieee80211_local *local = from_timer(local, t, dynamic_ps_timer);
1584
1585 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1586 }
1587
1588 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1589 {
1590 struct delayed_work *delayed_work = to_delayed_work(work);
1591 struct ieee80211_sub_if_data *sdata =
1592 container_of(delayed_work, struct ieee80211_sub_if_data,
1593 dfs_cac_timer_work);
1594 struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1595
1596 mutex_lock(&sdata->local->mtx);
1597 if (sdata->wdev.cac_started) {
1598 ieee80211_vif_release_channel(sdata);
1599 cfg80211_cac_event(sdata->dev, &chandef,
1600 NL80211_RADAR_CAC_FINISHED,
1601 GFP_KERNEL);
1602 }
1603 mutex_unlock(&sdata->local->mtx);
1604 }
1605
1606 static bool
1607 __ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1608 {
1609 struct ieee80211_local *local = sdata->local;
1610 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1611 bool ret = false;
1612 int ac;
1613
1614 if (local->hw.queues < IEEE80211_NUM_ACS)
1615 return false;
1616
1617 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1618 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
1619 int non_acm_ac;
1620 unsigned long now = jiffies;
1621
1622 if (tx_tspec->action == TX_TSPEC_ACTION_NONE &&
1623 tx_tspec->admitted_time &&
1624 time_after(now, tx_tspec->time_slice_start + HZ)) {
1625 tx_tspec->consumed_tx_time = 0;
1626 tx_tspec->time_slice_start = now;
1627
1628 if (tx_tspec->downgraded)
1629 tx_tspec->action =
1630 TX_TSPEC_ACTION_STOP_DOWNGRADE;
1631 }
1632
1633 switch (tx_tspec->action) {
1634 case TX_TSPEC_ACTION_STOP_DOWNGRADE:
1635 /* take the original parameters */
1636 if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac]))
1637 sdata_err(sdata,
1638 "failed to set TX queue parameters for queue %d\n",
1639 ac);
1640 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1641 tx_tspec->downgraded = false;
1642 ret = true;
1643 break;
1644 case TX_TSPEC_ACTION_DOWNGRADE:
1645 if (time_after(now, tx_tspec->time_slice_start + HZ)) {
1646 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1647 ret = true;
1648 break;
1649 }
1650 /* downgrade next lower non-ACM AC */
1651 for (non_acm_ac = ac + 1;
1652 non_acm_ac < IEEE80211_NUM_ACS;
1653 non_acm_ac++)
1654 if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac)))
1655 break;
1656 /* Usually the loop will result in using BK even if it
1657 * requires admission control, but such a configuration
1658 * makes no sense and we have to transmit somehow - the
1659 * AC selection does the same thing.
1660 * If we started out trying to downgrade from BK, then
1661 * the extra condition here might be needed.
1662 */
1663 if (non_acm_ac >= IEEE80211_NUM_ACS)
1664 non_acm_ac = IEEE80211_AC_BK;
1665 if (drv_conf_tx(local, sdata, ac,
1666 &sdata->tx_conf[non_acm_ac]))
1667 sdata_err(sdata,
1668 "failed to set TX queue parameters for queue %d\n",
1669 ac);
1670 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1671 ret = true;
1672 schedule_delayed_work(&ifmgd->tx_tspec_wk,
1673 tx_tspec->time_slice_start + HZ - now + 1);
1674 break;
1675 case TX_TSPEC_ACTION_NONE:
1676 /* nothing now */
1677 break;
1678 }
1679 }
1680
1681 return ret;
1682 }
1683
1684 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1685 {
1686 if (__ieee80211_sta_handle_tspec_ac_params(sdata))
1687 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
1688 }
1689
1690 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work)
1691 {
1692 struct ieee80211_sub_if_data *sdata;
1693
1694 sdata = container_of(work, struct ieee80211_sub_if_data,
1695 u.mgd.tx_tspec_wk.work);
1696 ieee80211_sta_handle_tspec_ac_params(sdata);
1697 }
1698
1699 /* MLME */
1700 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1701 struct ieee80211_sub_if_data *sdata,
1702 const u8 *wmm_param, size_t wmm_param_len)
1703 {
1704 struct ieee80211_tx_queue_params params[IEEE80211_NUM_ACS];
1705 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1706 size_t left;
1707 int count, ac;
1708 const u8 *pos;
1709 u8 uapsd_queues = 0;
1710
1711 if (!local->ops->conf_tx)
1712 return false;
1713
1714 if (local->hw.queues < IEEE80211_NUM_ACS)
1715 return false;
1716
1717 if (!wmm_param)
1718 return false;
1719
1720 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1721 return false;
1722
1723 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1724 uapsd_queues = ifmgd->uapsd_queues;
1725
1726 count = wmm_param[6] & 0x0f;
1727 if (count == ifmgd->wmm_last_param_set)
1728 return false;
1729 ifmgd->wmm_last_param_set = count;
1730
1731 pos = wmm_param + 8;
1732 left = wmm_param_len - 8;
1733
1734 memset(&params, 0, sizeof(params));
1735
1736 sdata->wmm_acm = 0;
1737 for (; left >= 4; left -= 4, pos += 4) {
1738 int aci = (pos[0] >> 5) & 0x03;
1739 int acm = (pos[0] >> 4) & 0x01;
1740 bool uapsd = false;
1741
1742 switch (aci) {
1743 case 1: /* AC_BK */
1744 ac = IEEE80211_AC_BK;
1745 if (acm)
1746 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1747 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1748 uapsd = true;
1749 break;
1750 case 2: /* AC_VI */
1751 ac = IEEE80211_AC_VI;
1752 if (acm)
1753 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1754 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1755 uapsd = true;
1756 break;
1757 case 3: /* AC_VO */
1758 ac = IEEE80211_AC_VO;
1759 if (acm)
1760 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1761 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1762 uapsd = true;
1763 break;
1764 case 0: /* AC_BE */
1765 default:
1766 ac = IEEE80211_AC_BE;
1767 if (acm)
1768 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1769 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1770 uapsd = true;
1771 break;
1772 }
1773
1774 params[ac].aifs = pos[0] & 0x0f;
1775
1776 if (params[ac].aifs < 2) {
1777 sdata_info(sdata,
1778 "AP has invalid WMM params (AIFSN=%d for ACI %d), will use 2\n",
1779 params[ac].aifs, aci);
1780 params[ac].aifs = 2;
1781 }
1782 params[ac].cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1783 params[ac].cw_min = ecw2cw(pos[1] & 0x0f);
1784 params[ac].txop = get_unaligned_le16(pos + 2);
1785 params[ac].acm = acm;
1786 params[ac].uapsd = uapsd;
1787
1788 if (params[ac].cw_min > params[ac].cw_max) {
1789 sdata_info(sdata,
1790 "AP has invalid WMM params (CWmin/max=%d/%d for ACI %d), using defaults\n",
1791 params[ac].cw_min, params[ac].cw_max, aci);
1792 return false;
1793 }
1794 }
1795
1796 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1797 mlme_dbg(sdata,
1798 "WMM AC=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n",
1799 ac, params[ac].acm,
1800 params[ac].aifs, params[ac].cw_min, params[ac].cw_max,
1801 params[ac].txop, params[ac].uapsd,
1802 ifmgd->tx_tspec[ac].downgraded);
1803 sdata->tx_conf[ac] = params[ac];
1804 if (!ifmgd->tx_tspec[ac].downgraded &&
1805 drv_conf_tx(local, sdata, ac, &params[ac]))
1806 sdata_err(sdata,
1807 "failed to set TX queue parameters for AC %d\n",
1808 ac);
1809 }
1810
1811 /* enable WMM or activate new settings */
1812 sdata->vif.bss_conf.qos = true;
1813 return true;
1814 }
1815
1816 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1817 {
1818 lockdep_assert_held(&sdata->local->mtx);
1819
1820 sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1821 ieee80211_run_deferred_scan(sdata->local);
1822 }
1823
1824 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1825 {
1826 mutex_lock(&sdata->local->mtx);
1827 __ieee80211_stop_poll(sdata);
1828 mutex_unlock(&sdata->local->mtx);
1829 }
1830
1831 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1832 u16 capab, bool erp_valid, u8 erp)
1833 {
1834 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1835 struct ieee80211_supported_band *sband;
1836 u32 changed = 0;
1837 bool use_protection;
1838 bool use_short_preamble;
1839 bool use_short_slot;
1840
1841 sband = ieee80211_get_sband(sdata);
1842 if (!sband)
1843 return changed;
1844
1845 if (erp_valid) {
1846 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1847 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1848 } else {
1849 use_protection = false;
1850 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1851 }
1852
1853 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1854 if (sband->band == NL80211_BAND_5GHZ)
1855 use_short_slot = true;
1856
1857 if (use_protection != bss_conf->use_cts_prot) {
1858 bss_conf->use_cts_prot = use_protection;
1859 changed |= BSS_CHANGED_ERP_CTS_PROT;
1860 }
1861
1862 if (use_short_preamble != bss_conf->use_short_preamble) {
1863 bss_conf->use_short_preamble = use_short_preamble;
1864 changed |= BSS_CHANGED_ERP_PREAMBLE;
1865 }
1866
1867 if (use_short_slot != bss_conf->use_short_slot) {
1868 bss_conf->use_short_slot = use_short_slot;
1869 changed |= BSS_CHANGED_ERP_SLOT;
1870 }
1871
1872 return changed;
1873 }
1874
1875 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1876 struct cfg80211_bss *cbss,
1877 u32 bss_info_changed)
1878 {
1879 struct ieee80211_bss *bss = (void *)cbss->priv;
1880 struct ieee80211_local *local = sdata->local;
1881 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1882
1883 bss_info_changed |= BSS_CHANGED_ASSOC;
1884 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1885 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1886
1887 sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1888 beacon_loss_count * bss_conf->beacon_int));
1889
1890 sdata->u.mgd.associated = cbss;
1891 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1892
1893 ieee80211_check_rate_mask(sdata);
1894
1895 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1896
1897 if (sdata->vif.p2p ||
1898 sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) {
1899 const struct cfg80211_bss_ies *ies;
1900
1901 rcu_read_lock();
1902 ies = rcu_dereference(cbss->ies);
1903 if (ies) {
1904 int ret;
1905
1906 ret = cfg80211_get_p2p_attr(
1907 ies->data, ies->len,
1908 IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1909 (u8 *) &bss_conf->p2p_noa_attr,
1910 sizeof(bss_conf->p2p_noa_attr));
1911 if (ret >= 2) {
1912 sdata->u.mgd.p2p_noa_index =
1913 bss_conf->p2p_noa_attr.index;
1914 bss_info_changed |= BSS_CHANGED_P2P_PS;
1915 }
1916 }
1917 rcu_read_unlock();
1918 }
1919
1920 /* just to be sure */
1921 ieee80211_stop_poll(sdata);
1922
1923 ieee80211_led_assoc(local, 1);
1924
1925 if (sdata->u.mgd.have_beacon) {
1926 /*
1927 * If the AP is buggy we may get here with no DTIM period
1928 * known, so assume it's 1 which is the only safe assumption
1929 * in that case, although if the TIM IE is broken powersave
1930 * probably just won't work at all.
1931 */
1932 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1933 bss_conf->beacon_rate = bss->beacon_rate;
1934 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1935 } else {
1936 bss_conf->beacon_rate = NULL;
1937 bss_conf->dtim_period = 0;
1938 }
1939
1940 bss_conf->assoc = 1;
1941
1942 /* Tell the driver to monitor connection quality (if supported) */
1943 if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1944 bss_conf->cqm_rssi_thold)
1945 bss_info_changed |= BSS_CHANGED_CQM;
1946
1947 /* Enable ARP filtering */
1948 if (bss_conf->arp_addr_cnt)
1949 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1950
1951 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1952
1953 mutex_lock(&local->iflist_mtx);
1954 ieee80211_recalc_ps(local);
1955 mutex_unlock(&local->iflist_mtx);
1956
1957 ieee80211_recalc_smps(sdata);
1958 ieee80211_recalc_ps_vif(sdata);
1959
1960 netif_carrier_on(sdata->dev);
1961 }
1962
1963 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1964 u16 stype, u16 reason, bool tx,
1965 u8 *frame_buf)
1966 {
1967 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1968 struct ieee80211_local *local = sdata->local;
1969 u32 changed = 0;
1970
1971 sdata_assert_lock(sdata);
1972
1973 if (WARN_ON_ONCE(tx && !frame_buf))
1974 return;
1975
1976 if (WARN_ON(!ifmgd->associated))
1977 return;
1978
1979 ieee80211_stop_poll(sdata);
1980
1981 ifmgd->associated = NULL;
1982 netif_carrier_off(sdata->dev);
1983
1984 /*
1985 * if we want to get out of ps before disassoc (why?) we have
1986 * to do it before sending disassoc, as otherwise the null-packet
1987 * won't be valid.
1988 */
1989 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1990 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1991 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1992 }
1993 local->ps_sdata = NULL;
1994
1995 /* disable per-vif ps */
1996 ieee80211_recalc_ps_vif(sdata);
1997
1998 /* make sure ongoing transmission finishes */
1999 synchronize_net();
2000
2001 /*
2002 * drop any frame before deauth/disassoc, this can be data or
2003 * management frame. Since we are disconnecting, we should not
2004 * insist sending these frames which can take time and delay
2005 * the disconnection and possible the roaming.
2006 */
2007 if (tx)
2008 ieee80211_flush_queues(local, sdata, true);
2009
2010 /* deauthenticate/disassociate now */
2011 if (tx || frame_buf)
2012 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
2013 reason, tx, frame_buf);
2014
2015 /* flush out frame - make sure the deauth was actually sent */
2016 if (tx)
2017 ieee80211_flush_queues(local, sdata, false);
2018
2019 /* clear bssid only after building the needed mgmt frames */
2020 eth_zero_addr(ifmgd->bssid);
2021
2022 /* remove AP and TDLS peers */
2023 sta_info_flush(sdata);
2024
2025 /* finally reset all BSS / config parameters */
2026 changed |= ieee80211_reset_erp_info(sdata);
2027
2028 ieee80211_led_assoc(local, 0);
2029 changed |= BSS_CHANGED_ASSOC;
2030 sdata->vif.bss_conf.assoc = false;
2031
2032 ifmgd->p2p_noa_index = -1;
2033 memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
2034 sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2035
2036 /* on the next assoc, re-program HT/VHT parameters */
2037 memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
2038 memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2039 memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
2040 memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2041
2042 /* reset MU-MIMO ownership and group data */
2043 memset(sdata->vif.bss_conf.mu_group.membership, 0,
2044 sizeof(sdata->vif.bss_conf.mu_group.membership));
2045 memset(sdata->vif.bss_conf.mu_group.position, 0,
2046 sizeof(sdata->vif.bss_conf.mu_group.position));
2047 changed |= BSS_CHANGED_MU_GROUPS;
2048 sdata->vif.mu_mimo_owner = false;
2049
2050 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2051
2052 del_timer_sync(&local->dynamic_ps_timer);
2053 cancel_work_sync(&local->dynamic_ps_enable_work);
2054
2055 /* Disable ARP filtering */
2056 if (sdata->vif.bss_conf.arp_addr_cnt)
2057 changed |= BSS_CHANGED_ARP_FILTER;
2058
2059 sdata->vif.bss_conf.qos = false;
2060 changed |= BSS_CHANGED_QOS;
2061
2062 /* The BSSID (not really interesting) and HT changed */
2063 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
2064 ieee80211_bss_info_change_notify(sdata, changed);
2065
2066 /* disassociated - set to defaults now */
2067 ieee80211_set_wmm_default(sdata, false, false);
2068
2069 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
2070 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
2071 del_timer_sync(&sdata->u.mgd.timer);
2072 del_timer_sync(&sdata->u.mgd.chswitch_timer);
2073
2074 sdata->vif.bss_conf.dtim_period = 0;
2075 sdata->vif.bss_conf.beacon_rate = NULL;
2076
2077 ifmgd->have_beacon = false;
2078
2079 ifmgd->flags = 0;
2080 mutex_lock(&local->mtx);
2081 ieee80211_vif_release_channel(sdata);
2082
2083 sdata->vif.csa_active = false;
2084 ifmgd->csa_waiting_bcn = false;
2085 ifmgd->csa_ignored_same_chan = false;
2086 if (sdata->csa_block_tx) {
2087 ieee80211_wake_vif_queues(local, sdata,
2088 IEEE80211_QUEUE_STOP_REASON_CSA);
2089 sdata->csa_block_tx = false;
2090 }
2091 mutex_unlock(&local->mtx);
2092
2093 /* existing TX TSPEC sessions no longer exist */
2094 memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
2095 cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);
2096
2097 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2098 }
2099
2100 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
2101 struct ieee80211_hdr *hdr)
2102 {
2103 /*
2104 * We can postpone the mgd.timer whenever receiving unicast frames
2105 * from AP because we know that the connection is working both ways
2106 * at that time. But multicast frames (and hence also beacons) must
2107 * be ignored here, because we need to trigger the timer during
2108 * data idle periods for sending the periodic probe request to the
2109 * AP we're connected to.
2110 */
2111 if (is_multicast_ether_addr(hdr->addr1))
2112 return;
2113
2114 ieee80211_sta_reset_conn_monitor(sdata);
2115 }
2116
2117 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
2118 {
2119 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2120 struct ieee80211_local *local = sdata->local;
2121
2122 mutex_lock(&local->mtx);
2123 if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
2124 goto out;
2125
2126 __ieee80211_stop_poll(sdata);
2127
2128 mutex_lock(&local->iflist_mtx);
2129 ieee80211_recalc_ps(local);
2130 mutex_unlock(&local->iflist_mtx);
2131
2132 if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
2133 goto out;
2134
2135 /*
2136 * We've received a probe response, but are not sure whether
2137 * we have or will be receiving any beacons or data, so let's
2138 * schedule the timers again, just in case.
2139 */
2140 ieee80211_sta_reset_beacon_monitor(sdata);
2141
2142 mod_timer(&ifmgd->conn_mon_timer,
2143 round_jiffies_up(jiffies +
2144 IEEE80211_CONNECTION_IDLE_TIME));
2145 out:
2146 mutex_unlock(&local->mtx);
2147 }
2148
2149 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
2150 struct ieee80211_hdr *hdr,
2151 u16 tx_time)
2152 {
2153 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2154 u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2155 int ac = ieee80211_ac_from_tid(tid);
2156 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
2157 unsigned long now = jiffies;
2158
2159 if (likely(!tx_tspec->admitted_time))
2160 return;
2161
2162 if (time_after(now, tx_tspec->time_slice_start + HZ)) {
2163 tx_tspec->consumed_tx_time = 0;
2164 tx_tspec->time_slice_start = now;
2165
2166 if (tx_tspec->downgraded) {
2167 tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE;
2168 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2169 }
2170 }
2171
2172 if (tx_tspec->downgraded)
2173 return;
2174
2175 tx_tspec->consumed_tx_time += tx_time;
2176
2177 if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) {
2178 tx_tspec->downgraded = true;
2179 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE;
2180 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2181 }
2182 }
2183
2184 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2185 struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2186 {
2187 ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);
2188
2189 if (!ieee80211_is_data(hdr->frame_control))
2190 return;
2191
2192 if (ieee80211_is_nullfunc(hdr->frame_control) &&
2193 sdata->u.mgd.probe_send_count > 0) {
2194 if (ack)
2195 ieee80211_sta_reset_conn_monitor(sdata);
2196 else
2197 sdata->u.mgd.nullfunc_failed = true;
2198 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2199 return;
2200 }
2201
2202 if (ack)
2203 ieee80211_sta_reset_conn_monitor(sdata);
2204 }
2205
2206 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
2207 {
2208 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2209 const u8 *ssid;
2210 u8 *dst = ifmgd->associated->bssid;
2211 u8 unicast_limit = max(1, max_probe_tries - 3);
2212 struct sta_info *sta;
2213
2214 /*
2215 * Try sending broadcast probe requests for the last three
2216 * probe requests after the first ones failed since some
2217 * buggy APs only support broadcast probe requests.
2218 */
2219 if (ifmgd->probe_send_count >= unicast_limit)
2220 dst = NULL;
2221
2222 /*
2223 * When the hardware reports an accurate Tx ACK status, it's
2224 * better to send a nullfunc frame instead of a probe request,
2225 * as it will kick us off the AP quickly if we aren't associated
2226 * anymore. The timeout will be reset if the frame is ACKed by
2227 * the AP.
2228 */
2229 ifmgd->probe_send_count++;
2230
2231 if (dst) {
2232 mutex_lock(&sdata->local->sta_mtx);
2233 sta = sta_info_get(sdata, dst);
2234 if (!WARN_ON(!sta))
2235 ieee80211_check_fast_rx(sta);
2236 mutex_unlock(&sdata->local->sta_mtx);
2237 }
2238
2239 if (ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
2240 ifmgd->nullfunc_failed = false;
2241 ieee80211_send_nullfunc(sdata->local, sdata, false);
2242 } else {
2243 int ssid_len;
2244
2245 rcu_read_lock();
2246 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2247 if (WARN_ON_ONCE(ssid == NULL))
2248 ssid_len = 0;
2249 else
2250 ssid_len = ssid[1];
2251
2252 ieee80211_send_probe_req(sdata, sdata->vif.addr, dst,
2253 ssid + 2, ssid_len, NULL,
2254 0, (u32) -1, true, 0,
2255 ifmgd->associated->channel, false);
2256 rcu_read_unlock();
2257 }
2258
2259 ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2260 run_again(sdata, ifmgd->probe_timeout);
2261 }
2262
2263 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
2264 bool beacon)
2265 {
2266 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2267 bool already = false;
2268
2269 if (!ieee80211_sdata_running(sdata))
2270 return;
2271
2272 sdata_lock(sdata);
2273
2274 if (!ifmgd->associated)
2275 goto out;
2276
2277 mutex_lock(&sdata->local->mtx);
2278
2279 if (sdata->local->tmp_channel || sdata->local->scanning) {
2280 mutex_unlock(&sdata->local->mtx);
2281 goto out;
2282 }
2283
2284 if (beacon) {
2285 mlme_dbg_ratelimited(sdata,
2286 "detected beacon loss from AP (missed %d beacons) - probing\n",
2287 beacon_loss_count);
2288
2289 ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL);
2290 }
2291
2292 /*
2293 * The driver/our work has already reported this event or the
2294 * connection monitoring has kicked in and we have already sent
2295 * a probe request. Or maybe the AP died and the driver keeps
2296 * reporting until we disassociate...
2297 *
2298 * In either case we have to ignore the current call to this
2299 * function (except for setting the correct probe reason bit)
2300 * because otherwise we would reset the timer every time and
2301 * never check whether we received a probe response!
2302 */
2303 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
2304 already = true;
2305
2306 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2307
2308 mutex_unlock(&sdata->local->mtx);
2309
2310 if (already)
2311 goto out;
2312
2313 mutex_lock(&sdata->local->iflist_mtx);
2314 ieee80211_recalc_ps(sdata->local);
2315 mutex_unlock(&sdata->local->iflist_mtx);
2316
2317 ifmgd->probe_send_count = 0;
2318 ieee80211_mgd_probe_ap_send(sdata);
2319 out:
2320 sdata_unlock(sdata);
2321 }
2322
2323 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2324 struct ieee80211_vif *vif)
2325 {
2326 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2327 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2328 struct cfg80211_bss *cbss;
2329 struct sk_buff *skb;
2330 const u8 *ssid;
2331 int ssid_len;
2332
2333 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2334 return NULL;
2335
2336 sdata_assert_lock(sdata);
2337
2338 if (ifmgd->associated)
2339 cbss = ifmgd->associated;
2340 else if (ifmgd->auth_data)
2341 cbss = ifmgd->auth_data->bss;
2342 else if (ifmgd->assoc_data)
2343 cbss = ifmgd->assoc_data->bss;
2344 else
2345 return NULL;
2346
2347 rcu_read_lock();
2348 ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2349 if (WARN_ON_ONCE(ssid == NULL))
2350 ssid_len = 0;
2351 else
2352 ssid_len = ssid[1];
2353
2354 skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
2355 (u32) -1, cbss->channel,
2356 ssid + 2, ssid_len,
2357 NULL, 0, true);
2358 rcu_read_unlock();
2359
2360 return skb;
2361 }
2362 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2363
2364 static void ieee80211_report_disconnect(struct ieee80211_sub_if_data *sdata,
2365 const u8 *buf, size_t len, bool tx,
2366 u16 reason)
2367 {
2368 struct ieee80211_event event = {
2369 .type = MLME_EVENT,
2370 .u.mlme.data = tx ? DEAUTH_TX_EVENT : DEAUTH_RX_EVENT,
2371 .u.mlme.reason = reason,
2372 };
2373
2374 if (tx)
2375 cfg80211_tx_mlme_mgmt(sdata->dev, buf, len);
2376 else
2377 cfg80211_rx_mlme_mgmt(sdata->dev, buf, len);
2378
2379 drv_event_callback(sdata->local, sdata, &event);
2380 }
2381
2382 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2383 {
2384 struct ieee80211_local *local = sdata->local;
2385 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2386 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2387
2388 sdata_lock(sdata);
2389 if (!ifmgd->associated) {
2390 sdata_unlock(sdata);
2391 return;
2392 }
2393
2394 /* AP is probably out of range (or not reachable for another reason) so
2395 * remove the bss struct for that AP.
2396 */
2397 cfg80211_unlink_bss(local->hw.wiphy, ifmgd->associated);
2398
2399 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2400 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2401 true, frame_buf);
2402 mutex_lock(&local->mtx);
2403 sdata->vif.csa_active = false;
2404 ifmgd->csa_waiting_bcn = false;
2405 if (sdata->csa_block_tx) {
2406 ieee80211_wake_vif_queues(local, sdata,
2407 IEEE80211_QUEUE_STOP_REASON_CSA);
2408 sdata->csa_block_tx = false;
2409 }
2410 mutex_unlock(&local->mtx);
2411
2412 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
2413 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2414
2415 sdata_unlock(sdata);
2416 }
2417
2418 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2419 {
2420 struct ieee80211_sub_if_data *sdata =
2421 container_of(work, struct ieee80211_sub_if_data,
2422 u.mgd.beacon_connection_loss_work);
2423 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2424
2425 if (ifmgd->associated)
2426 ifmgd->beacon_loss_count++;
2427
2428 if (ifmgd->connection_loss) {
2429 sdata_info(sdata, "Connection to AP %pM lost\n",
2430 ifmgd->bssid);
2431 __ieee80211_disconnect(sdata);
2432 } else {
2433 ieee80211_mgd_probe_ap(sdata, true);
2434 }
2435 }
2436
2437 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2438 {
2439 struct ieee80211_sub_if_data *sdata =
2440 container_of(work, struct ieee80211_sub_if_data,
2441 u.mgd.csa_connection_drop_work);
2442
2443 __ieee80211_disconnect(sdata);
2444 }
2445
2446 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2447 {
2448 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2449 struct ieee80211_hw *hw = &sdata->local->hw;
2450
2451 trace_api_beacon_loss(sdata);
2452
2453 sdata->u.mgd.connection_loss = false;
2454 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2455 }
2456 EXPORT_SYMBOL(ieee80211_beacon_loss);
2457
2458 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2459 {
2460 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2461 struct ieee80211_hw *hw = &sdata->local->hw;
2462
2463 trace_api_connection_loss(sdata);
2464
2465 sdata->u.mgd.connection_loss = true;
2466 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2467 }
2468 EXPORT_SYMBOL(ieee80211_connection_loss);
2469
2470
2471 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2472 bool assoc)
2473 {
2474 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2475
2476 sdata_assert_lock(sdata);
2477
2478 if (!assoc) {
2479 /*
2480 * we are not authenticated yet, the only timer that could be
2481 * running is the timeout for the authentication response which
2482 * which is not relevant anymore.
2483 */
2484 del_timer_sync(&sdata->u.mgd.timer);
2485 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2486
2487 eth_zero_addr(sdata->u.mgd.bssid);
2488 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2489 sdata->u.mgd.flags = 0;
2490 mutex_lock(&sdata->local->mtx);
2491 ieee80211_vif_release_channel(sdata);
2492 mutex_unlock(&sdata->local->mtx);
2493 }
2494
2495 cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2496 kfree(auth_data);
2497 sdata->u.mgd.auth_data = NULL;
2498 }
2499
2500 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2501 bool assoc, bool abandon)
2502 {
2503 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2504
2505 sdata_assert_lock(sdata);
2506
2507 if (!assoc) {
2508 /*
2509 * we are not associated yet, the only timer that could be
2510 * running is the timeout for the association response which
2511 * which is not relevant anymore.
2512 */
2513 del_timer_sync(&sdata->u.mgd.timer);
2514 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2515
2516 eth_zero_addr(sdata->u.mgd.bssid);
2517 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2518 sdata->u.mgd.flags = 0;
2519 sdata->vif.mu_mimo_owner = false;
2520
2521 mutex_lock(&sdata->local->mtx);
2522 ieee80211_vif_release_channel(sdata);
2523 mutex_unlock(&sdata->local->mtx);
2524
2525 if (abandon)
2526 cfg80211_abandon_assoc(sdata->dev, assoc_data->bss);
2527 }
2528
2529 kfree(assoc_data);
2530 sdata->u.mgd.assoc_data = NULL;
2531 }
2532
2533 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2534 struct ieee80211_mgmt *mgmt, size_t len)
2535 {
2536 struct ieee80211_local *local = sdata->local;
2537 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2538 u8 *pos;
2539 struct ieee802_11_elems elems;
2540 u32 tx_flags = 0;
2541
2542 pos = mgmt->u.auth.variable;
2543 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2544 if (!elems.challenge)
2545 return;
2546 auth_data->expected_transaction = 4;
2547 drv_mgd_prepare_tx(sdata->local, sdata);
2548 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
2549 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2550 IEEE80211_TX_INTFL_MLME_CONN_TX;
2551 ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2552 elems.challenge - 2, elems.challenge_len + 2,
2553 auth_data->bss->bssid, auth_data->bss->bssid,
2554 auth_data->key, auth_data->key_len,
2555 auth_data->key_idx, tx_flags);
2556 }
2557
2558 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2559 struct ieee80211_mgmt *mgmt, size_t len)
2560 {
2561 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2562 u8 bssid[ETH_ALEN];
2563 u16 auth_alg, auth_transaction, status_code;
2564 struct sta_info *sta;
2565 struct ieee80211_event event = {
2566 .type = MLME_EVENT,
2567 .u.mlme.data = AUTH_EVENT,
2568 };
2569
2570 sdata_assert_lock(sdata);
2571
2572 if (len < 24 + 6)
2573 return;
2574
2575 if (!ifmgd->auth_data || ifmgd->auth_data->done)
2576 return;
2577
2578 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2579
2580 if (!ether_addr_equal(bssid, mgmt->bssid))
2581 return;
2582
2583 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2584 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2585 status_code = le16_to_cpu(mgmt->u.auth.status_code);
2586
2587 if (auth_alg != ifmgd->auth_data->algorithm ||
2588 auth_transaction != ifmgd->auth_data->expected_transaction) {
2589 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2590 mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2591 auth_transaction,
2592 ifmgd->auth_data->expected_transaction);
2593 return;
2594 }
2595
2596 if (status_code != WLAN_STATUS_SUCCESS) {
2597 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2598 mgmt->sa, status_code);
2599 ieee80211_destroy_auth_data(sdata, false);
2600 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2601 event.u.mlme.status = MLME_DENIED;
2602 event.u.mlme.reason = status_code;
2603 drv_event_callback(sdata->local, sdata, &event);
2604 return;
2605 }
2606
2607 switch (ifmgd->auth_data->algorithm) {
2608 case WLAN_AUTH_OPEN:
2609 case WLAN_AUTH_LEAP:
2610 case WLAN_AUTH_FT:
2611 case WLAN_AUTH_SAE:
2612 case WLAN_AUTH_FILS_SK:
2613 case WLAN_AUTH_FILS_SK_PFS:
2614 case WLAN_AUTH_FILS_PK:
2615 break;
2616 case WLAN_AUTH_SHARED_KEY:
2617 if (ifmgd->auth_data->expected_transaction != 4) {
2618 ieee80211_auth_challenge(sdata, mgmt, len);
2619 /* need another frame */
2620 return;
2621 }
2622 break;
2623 default:
2624 WARN_ONCE(1, "invalid auth alg %d",
2625 ifmgd->auth_data->algorithm);
2626 return;
2627 }
2628
2629 event.u.mlme.status = MLME_SUCCESS;
2630 drv_event_callback(sdata->local, sdata, &event);
2631 sdata_info(sdata, "authenticated\n");
2632 ifmgd->auth_data->done = true;
2633 ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2634 ifmgd->auth_data->timeout_started = true;
2635 run_again(sdata, ifmgd->auth_data->timeout);
2636
2637 if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2638 ifmgd->auth_data->expected_transaction != 2) {
2639 /*
2640 * Report auth frame to user space for processing since another
2641 * round of Authentication frames is still needed.
2642 */
2643 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2644 return;
2645 }
2646
2647 /* move station state to auth */
2648 mutex_lock(&sdata->local->sta_mtx);
2649 sta = sta_info_get(sdata, bssid);
2650 if (!sta) {
2651 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2652 goto out_err;
2653 }
2654 if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2655 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2656 goto out_err;
2657 }
2658 mutex_unlock(&sdata->local->sta_mtx);
2659
2660 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2661 return;
2662 out_err:
2663 mutex_unlock(&sdata->local->sta_mtx);
2664 /* ignore frame -- wait for timeout */
2665 }
2666
2667 #define case_WLAN(type) \
2668 case WLAN_REASON_##type: return #type
2669
2670 static const char *ieee80211_get_reason_code_string(u16 reason_code)
2671 {
2672 switch (reason_code) {
2673 case_WLAN(UNSPECIFIED);
2674 case_WLAN(PREV_AUTH_NOT_VALID);
2675 case_WLAN(DEAUTH_LEAVING);
2676 case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2677 case_WLAN(DISASSOC_AP_BUSY);
2678 case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2679 case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2680 case_WLAN(DISASSOC_STA_HAS_LEFT);
2681 case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2682 case_WLAN(DISASSOC_BAD_POWER);
2683 case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2684 case_WLAN(INVALID_IE);
2685 case_WLAN(MIC_FAILURE);
2686 case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2687 case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2688 case_WLAN(IE_DIFFERENT);
2689 case_WLAN(INVALID_GROUP_CIPHER);
2690 case_WLAN(INVALID_PAIRWISE_CIPHER);
2691 case_WLAN(INVALID_AKMP);
2692 case_WLAN(UNSUPP_RSN_VERSION);
2693 case_WLAN(INVALID_RSN_IE_CAP);
2694 case_WLAN(IEEE8021X_FAILED);
2695 case_WLAN(CIPHER_SUITE_REJECTED);
2696 case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2697 case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2698 case_WLAN(DISASSOC_LOW_ACK);
2699 case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2700 case_WLAN(QSTA_LEAVE_QBSS);
2701 case_WLAN(QSTA_NOT_USE);
2702 case_WLAN(QSTA_REQUIRE_SETUP);
2703 case_WLAN(QSTA_TIMEOUT);
2704 case_WLAN(QSTA_CIPHER_NOT_SUPP);
2705 case_WLAN(MESH_PEER_CANCELED);
2706 case_WLAN(MESH_MAX_PEERS);
2707 case_WLAN(MESH_CONFIG);
2708 case_WLAN(MESH_CLOSE);
2709 case_WLAN(MESH_MAX_RETRIES);
2710 case_WLAN(MESH_CONFIRM_TIMEOUT);
2711 case_WLAN(MESH_INVALID_GTK);
2712 case_WLAN(MESH_INCONSISTENT_PARAM);
2713 case_WLAN(MESH_INVALID_SECURITY);
2714 case_WLAN(MESH_PATH_ERROR);
2715 case_WLAN(MESH_PATH_NOFORWARD);
2716 case_WLAN(MESH_PATH_DEST_UNREACHABLE);
2717 case_WLAN(MAC_EXISTS_IN_MBSS);
2718 case_WLAN(MESH_CHAN_REGULATORY);
2719 case_WLAN(MESH_CHAN);
2720 default: return "<unknown>";
2721 }
2722 }
2723
2724 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2725 struct ieee80211_mgmt *mgmt, size_t len)
2726 {
2727 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2728 u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2729
2730 sdata_assert_lock(sdata);
2731
2732 if (len < 24 + 2)
2733 return;
2734
2735 if (ifmgd->associated &&
2736 ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) {
2737 const u8 *bssid = ifmgd->associated->bssid;
2738
2739 sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
2740 bssid, reason_code,
2741 ieee80211_get_reason_code_string(reason_code));
2742
2743 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2744
2745 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false,
2746 reason_code);
2747 return;
2748 }
2749
2750 if (ifmgd->assoc_data &&
2751 ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2752 const u8 *bssid = ifmgd->assoc_data->bss->bssid;
2753
2754 sdata_info(sdata,
2755 "deauthenticated from %pM while associating (Reason: %u=%s)\n",
2756 bssid, reason_code,
2757 ieee80211_get_reason_code_string(reason_code));
2758
2759 ieee80211_destroy_assoc_data(sdata, false, true);
2760
2761 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2762 return;
2763 }
2764 }
2765
2766
2767 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2768 struct ieee80211_mgmt *mgmt, size_t len)
2769 {
2770 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2771 u16 reason_code;
2772
2773 sdata_assert_lock(sdata);
2774
2775 if (len < 24 + 2)
2776 return;
2777
2778 if (!ifmgd->associated ||
2779 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2780 return;
2781
2782 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2783
2784 sdata_info(sdata, "disassociated from %pM (Reason: %u=%s)\n",
2785 mgmt->sa, reason_code,
2786 ieee80211_get_reason_code_string(reason_code));
2787
2788 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2789
2790 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code);
2791 }
2792
2793 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2794 u8 *supp_rates, unsigned int supp_rates_len,
2795 u32 *rates, u32 *basic_rates,
2796 bool *have_higher_than_11mbit,
2797 int *min_rate, int *min_rate_index,
2798 int shift)
2799 {
2800 int i, j;
2801
2802 for (i = 0; i < supp_rates_len; i++) {
2803 int rate = supp_rates[i] & 0x7f;
2804 bool is_basic = !!(supp_rates[i] & 0x80);
2805
2806 if ((rate * 5 * (1 << shift)) > 110)
2807 *have_higher_than_11mbit = true;
2808
2809 /*
2810 * Skip HT and VHT BSS membership selectors since they're not
2811 * rates.
2812 *
2813 * Note: Even though the membership selector and the basic
2814 * rate flag share the same bit, they are not exactly
2815 * the same.
2816 */
2817 if (supp_rates[i] == (0x80 | BSS_MEMBERSHIP_SELECTOR_HT_PHY) ||
2818 supp_rates[i] == (0x80 | BSS_MEMBERSHIP_SELECTOR_VHT_PHY))
2819 continue;
2820
2821 for (j = 0; j < sband->n_bitrates; j++) {
2822 struct ieee80211_rate *br;
2823 int brate;
2824
2825 br = &sband->bitrates[j];
2826
2827 brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2828 if (brate == rate) {
2829 *rates |= BIT(j);
2830 if (is_basic)
2831 *basic_rates |= BIT(j);
2832 if ((rate * 5) < *min_rate) {
2833 *min_rate = rate * 5;
2834 *min_rate_index = j;
2835 }
2836 break;
2837 }
2838 }
2839 }
2840 }
2841
2842 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2843 struct cfg80211_bss *cbss,
2844 struct ieee80211_mgmt *mgmt, size_t len)
2845 {
2846 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2847 struct ieee80211_local *local = sdata->local;
2848 struct ieee80211_supported_band *sband;
2849 struct sta_info *sta;
2850 u8 *pos;
2851 u16 capab_info, aid;
2852 struct ieee802_11_elems elems;
2853 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2854 const struct cfg80211_bss_ies *bss_ies = NULL;
2855 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2856 u32 changed = 0;
2857 int err;
2858 bool ret;
2859
2860 /* AssocResp and ReassocResp have identical structure */
2861
2862 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2863 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2864
2865 /*
2866 * The 5 MSB of the AID field are reserved
2867 * (802.11-2016 9.4.1.8 AID field)
2868 */
2869 aid &= 0x7ff;
2870
2871 ifmgd->broken_ap = false;
2872
2873 if (aid == 0 || aid > IEEE80211_MAX_AID) {
2874 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2875 aid);
2876 aid = 0;
2877 ifmgd->broken_ap = true;
2878 }
2879
2880 pos = mgmt->u.assoc_resp.variable;
2881 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2882
2883 if (!elems.supp_rates) {
2884 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2885 return false;
2886 }
2887
2888 ifmgd->aid = aid;
2889 ifmgd->tdls_chan_switch_prohibited =
2890 elems.ext_capab && elems.ext_capab_len >= 5 &&
2891 (elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
2892
2893 /*
2894 * Some APs are erroneously not including some information in their
2895 * (re)association response frames. Try to recover by using the data
2896 * from the beacon or probe response. This seems to afflict mobile
2897 * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2898 * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2899 */
2900 if ((assoc_data->wmm && !elems.wmm_param) ||
2901 (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2902 (!elems.ht_cap_elem || !elems.ht_operation)) ||
2903 (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2904 (!elems.vht_cap_elem || !elems.vht_operation))) {
2905 const struct cfg80211_bss_ies *ies;
2906 struct ieee802_11_elems bss_elems;
2907
2908 rcu_read_lock();
2909 ies = rcu_dereference(cbss->ies);
2910 if (ies)
2911 bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2912 GFP_ATOMIC);
2913 rcu_read_unlock();
2914 if (!bss_ies)
2915 return false;
2916
2917 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2918 false, &bss_elems);
2919 if (assoc_data->wmm &&
2920 !elems.wmm_param && bss_elems.wmm_param) {
2921 elems.wmm_param = bss_elems.wmm_param;
2922 sdata_info(sdata,
2923 "AP bug: WMM param missing from AssocResp\n");
2924 }
2925
2926 /*
2927 * Also check if we requested HT/VHT, otherwise the AP doesn't
2928 * have to include the IEs in the (re)association response.
2929 */
2930 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2931 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2932 elems.ht_cap_elem = bss_elems.ht_cap_elem;
2933 sdata_info(sdata,
2934 "AP bug: HT capability missing from AssocResp\n");
2935 }
2936 if (!elems.ht_operation && bss_elems.ht_operation &&
2937 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2938 elems.ht_operation = bss_elems.ht_operation;
2939 sdata_info(sdata,
2940 "AP bug: HT operation missing from AssocResp\n");
2941 }
2942 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2943 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2944 elems.vht_cap_elem = bss_elems.vht_cap_elem;
2945 sdata_info(sdata,
2946 "AP bug: VHT capa missing from AssocResp\n");
2947 }
2948 if (!elems.vht_operation && bss_elems.vht_operation &&
2949 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2950 elems.vht_operation = bss_elems.vht_operation;
2951 sdata_info(sdata,
2952 "AP bug: VHT operation missing from AssocResp\n");
2953 }
2954 }
2955
2956 /*
2957 * We previously checked these in the beacon/probe response, so
2958 * they should be present here. This is just a safety net.
2959 */
2960 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2961 (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2962 sdata_info(sdata,
2963 "HT AP is missing WMM params or HT capability/operation\n");
2964 ret = false;
2965 goto out;
2966 }
2967
2968 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2969 (!elems.vht_cap_elem || !elems.vht_operation)) {
2970 sdata_info(sdata,
2971 "VHT AP is missing VHT capability/operation\n");
2972 ret = false;
2973 goto out;
2974 }
2975
2976 mutex_lock(&sdata->local->sta_mtx);
2977 /*
2978 * station info was already allocated and inserted before
2979 * the association and should be available to us
2980 */
2981 sta = sta_info_get(sdata, cbss->bssid);
2982 if (WARN_ON(!sta)) {
2983 mutex_unlock(&sdata->local->sta_mtx);
2984 ret = false;
2985 goto out;
2986 }
2987
2988 sband = ieee80211_get_sband(sdata);
2989 if (!sband) {
2990 mutex_unlock(&sdata->local->sta_mtx);
2991 ret = false;
2992 goto out;
2993 }
2994
2995 /* Set up internal HT/VHT capabilities */
2996 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2997 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2998 elems.ht_cap_elem, sta);
2999
3000 if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
3001 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
3002 elems.vht_cap_elem, sta);
3003
3004 /*
3005 * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
3006 * in their association response, so ignore that data for our own
3007 * configuration. If it changed since the last beacon, we'll get the
3008 * next beacon and update then.
3009 */
3010
3011 /*
3012 * If an operating mode notification IE is present, override the
3013 * NSS calculation (that would be done in rate_control_rate_init())
3014 * and use the # of streams from that element.
3015 */
3016 if (elems.opmode_notif &&
3017 !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
3018 u8 nss;
3019
3020 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
3021 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
3022 nss += 1;
3023 sta->sta.rx_nss = nss;
3024 }
3025
3026 rate_control_rate_init(sta);
3027
3028 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) {
3029 set_sta_flag(sta, WLAN_STA_MFP);
3030 sta->sta.mfp = true;
3031 } else {
3032 sta->sta.mfp = false;
3033 }
3034
3035 sta->sta.wme = elems.wmm_param && local->hw.queues >= IEEE80211_NUM_ACS;
3036
3037 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
3038 if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
3039 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
3040 if (err) {
3041 sdata_info(sdata,
3042 "failed to move station %pM to desired state\n",
3043 sta->sta.addr);
3044 WARN_ON(__sta_info_destroy(sta));
3045 mutex_unlock(&sdata->local->sta_mtx);
3046 ret = false;
3047 goto out;
3048 }
3049
3050 mutex_unlock(&sdata->local->sta_mtx);
3051
3052 /*
3053 * Always handle WMM once after association regardless
3054 * of the first value the AP uses. Setting -1 here has
3055 * that effect because the AP values is an unsigned
3056 * 4-bit value.
3057 */
3058 ifmgd->wmm_last_param_set = -1;
3059
3060 if (ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
3061 ieee80211_set_wmm_default(sdata, false, false);
3062 } else if (!ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3063 elems.wmm_param_len)) {
3064 /* still enable QoS since we might have HT/VHT */
3065 ieee80211_set_wmm_default(sdata, false, true);
3066 /* set the disable-WMM flag in this case to disable
3067 * tracking WMM parameter changes in the beacon if
3068 * the parameters weren't actually valid. Doing so
3069 * avoids changing parameters very strangely when
3070 * the AP is going back and forth between valid and
3071 * invalid parameters.
3072 */
3073 ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
3074 }
3075 changed |= BSS_CHANGED_QOS;
3076
3077 if (elems.max_idle_period_ie) {
3078 bss_conf->max_idle_period =
3079 le16_to_cpu(elems.max_idle_period_ie->max_idle_period);
3080 bss_conf->protected_keep_alive =
3081 !!(elems.max_idle_period_ie->idle_options &
3082 WLAN_IDLE_OPTIONS_PROTECTED_KEEP_ALIVE);
3083 changed |= BSS_CHANGED_KEEP_ALIVE;
3084 } else {
3085 bss_conf->max_idle_period = 0;
3086 bss_conf->protected_keep_alive = false;
3087 }
3088
3089 /* set AID and assoc capability,
3090 * ieee80211_set_associated() will tell the driver */
3091 bss_conf->aid = aid;
3092 bss_conf->assoc_capability = capab_info;
3093 ieee80211_set_associated(sdata, cbss, changed);
3094
3095 /*
3096 * If we're using 4-addr mode, let the AP know that we're
3097 * doing so, so that it can create the STA VLAN on its side
3098 */
3099 if (ifmgd->use_4addr)
3100 ieee80211_send_4addr_nullfunc(local, sdata);
3101
3102 /*
3103 * Start timer to probe the connection to the AP now.
3104 * Also start the timer that will detect beacon loss.
3105 */
3106 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
3107 ieee80211_sta_reset_beacon_monitor(sdata);
3108
3109 ret = true;
3110 out:
3111 kfree(bss_ies);
3112 return ret;
3113 }
3114
3115 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
3116 struct ieee80211_mgmt *mgmt,
3117 size_t len)
3118 {
3119 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3120 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
3121 u16 capab_info, status_code, aid;
3122 struct ieee802_11_elems elems;
3123 int ac, uapsd_queues = -1;
3124 u8 *pos;
3125 bool reassoc;
3126 struct cfg80211_bss *bss;
3127 struct ieee80211_event event = {
3128 .type = MLME_EVENT,
3129 .u.mlme.data = ASSOC_EVENT,
3130 };
3131
3132 sdata_assert_lock(sdata);
3133
3134 if (!assoc_data)
3135 return;
3136 if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3137 return;
3138
3139 /*
3140 * AssocResp and ReassocResp have identical structure, so process both
3141 * of them in this function.
3142 */
3143
3144 if (len < 24 + 6)
3145 return;
3146
3147 reassoc = ieee80211_is_reassoc_resp(mgmt->frame_control);
3148 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
3149 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
3150 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
3151
3152 sdata_info(sdata,
3153 "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
3154 reassoc ? "Rea" : "A", mgmt->sa,
3155 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
3156
3157 if (assoc_data->fils_kek_len &&
3158 fils_decrypt_assoc_resp(sdata, (u8 *)mgmt, &len, assoc_data) < 0)
3159 return;
3160
3161 pos = mgmt->u.assoc_resp.variable;
3162 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
3163
3164 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3165 elems.timeout_int &&
3166 elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
3167 u32 tu, ms;
3168 tu = le32_to_cpu(elems.timeout_int->value);
3169 ms = tu * 1024 / 1000;
3170 sdata_info(sdata,
3171 "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
3172 mgmt->sa, tu, ms);
3173 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3174 assoc_data->timeout_started = true;
3175 if (ms > IEEE80211_ASSOC_TIMEOUT)
3176 run_again(sdata, assoc_data->timeout);
3177 return;
3178 }
3179
3180 bss = assoc_data->bss;
3181
3182 if (status_code != WLAN_STATUS_SUCCESS) {
3183 sdata_info(sdata, "%pM denied association (code=%d)\n",
3184 mgmt->sa, status_code);
3185 ieee80211_destroy_assoc_data(sdata, false, false);
3186 event.u.mlme.status = MLME_DENIED;
3187 event.u.mlme.reason = status_code;
3188 drv_event_callback(sdata->local, sdata, &event);
3189 } else {
3190 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
3191 /* oops -- internal error -- send timeout for now */
3192 ieee80211_destroy_assoc_data(sdata, false, false);
3193 cfg80211_assoc_timeout(sdata->dev, bss);
3194 return;
3195 }
3196 event.u.mlme.status = MLME_SUCCESS;
3197 drv_event_callback(sdata->local, sdata, &event);
3198 sdata_info(sdata, "associated\n");
3199
3200 /*
3201 * destroy assoc_data afterwards, as otherwise an idle
3202 * recalc after assoc_data is NULL but before associated
3203 * is set can cause the interface to go idle
3204 */
3205 ieee80211_destroy_assoc_data(sdata, true, false);
3206
3207 /* get uapsd queues configuration */
3208 uapsd_queues = 0;
3209 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
3210 if (sdata->tx_conf[ac].uapsd)
3211 uapsd_queues |= ieee80211_ac_to_qos_mask[ac];
3212 }
3213
3214 cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
3215 }
3216
3217 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
3218 struct ieee80211_mgmt *mgmt, size_t len,
3219 struct ieee80211_rx_status *rx_status,
3220 struct ieee802_11_elems *elems)
3221 {
3222 struct ieee80211_local *local = sdata->local;
3223 struct ieee80211_bss *bss;
3224 struct ieee80211_channel *channel;
3225
3226 sdata_assert_lock(sdata);
3227
3228 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
3229 if (!channel)
3230 return;
3231
3232 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3233 channel);
3234 if (bss) {
3235 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3236 ieee80211_rx_bss_put(local, bss);
3237 }
3238 }
3239
3240
3241 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
3242 struct sk_buff *skb)
3243 {
3244 struct ieee80211_mgmt *mgmt = (void *)skb->data;
3245 struct ieee80211_if_managed *ifmgd;
3246 struct ieee80211_rx_status *rx_status = (void *) skb->cb;
3247 size_t baselen, len = skb->len;
3248 struct ieee802_11_elems elems;
3249
3250 ifmgd = &sdata->u.mgd;
3251
3252 sdata_assert_lock(sdata);
3253
3254 if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3255 return; /* ignore ProbeResp to foreign address */
3256
3257 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
3258 if (baselen > len)
3259 return;
3260
3261 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3262 false, &elems);
3263
3264 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3265
3266 if (ifmgd->associated &&
3267 ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3268 ieee80211_reset_ap_probe(sdata);
3269 }
3270
3271 /*
3272 * This is the canonical list of information elements we care about,
3273 * the filter code also gives us all changes to the Microsoft OUI
3274 * (00:50:F2) vendor IE which is used for WMM which we need to track,
3275 * as well as the DTPC IE (part of the Cisco OUI) used for signaling
3276 * changes to requested client power.
3277 *
3278 * We implement beacon filtering in software since that means we can
3279 * avoid processing the frame here and in cfg80211, and userspace
3280 * will not be able to tell whether the hardware supports it or not.
3281 *
3282 * XXX: This list needs to be dynamic -- userspace needs to be able to
3283 * add items it requires. It also needs to be able to tell us to
3284 * look out for other vendor IEs.
3285 */
3286 static const u64 care_about_ies =
3287 (1ULL << WLAN_EID_COUNTRY) |
3288 (1ULL << WLAN_EID_ERP_INFO) |
3289 (1ULL << WLAN_EID_CHANNEL_SWITCH) |
3290 (1ULL << WLAN_EID_PWR_CONSTRAINT) |
3291 (1ULL << WLAN_EID_HT_CAPABILITY) |
3292 (1ULL << WLAN_EID_HT_OPERATION) |
3293 (1ULL << WLAN_EID_EXT_CHANSWITCH_ANN);
3294
3295 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
3296 struct ieee80211_mgmt *mgmt, size_t len,
3297 struct ieee80211_rx_status *rx_status)
3298 {
3299 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3300 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3301 size_t baselen;
3302 struct ieee802_11_elems elems;
3303 struct ieee80211_local *local = sdata->local;
3304 struct ieee80211_chanctx_conf *chanctx_conf;
3305 struct ieee80211_channel *chan;
3306 struct sta_info *sta;
3307 u32 changed = 0;
3308 bool erp_valid;
3309 u8 erp_value = 0;
3310 u32 ncrc;
3311 u8 *bssid;
3312 u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3313
3314 sdata_assert_lock(sdata);
3315
3316 /* Process beacon from the current BSS */
3317 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
3318 if (baselen > len)
3319 return;
3320
3321 rcu_read_lock();
3322 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3323 if (!chanctx_conf) {
3324 rcu_read_unlock();
3325 return;
3326 }
3327
3328 if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
3329 rcu_read_unlock();
3330 return;
3331 }
3332 chan = chanctx_conf->def.chan;
3333 rcu_read_unlock();
3334
3335 if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3336 ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
3337 ieee802_11_parse_elems(mgmt->u.beacon.variable,
3338 len - baselen, false, &elems);
3339
3340 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3341 if (elems.tim && !elems.parse_error) {
3342 const struct ieee80211_tim_ie *tim_ie = elems.tim;
3343 ifmgd->dtim_period = tim_ie->dtim_period;
3344 }
3345 ifmgd->have_beacon = true;
3346 ifmgd->assoc_data->need_beacon = false;
3347 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3348 sdata->vif.bss_conf.sync_tsf =
3349 le64_to_cpu(mgmt->u.beacon.timestamp);
3350 sdata->vif.bss_conf.sync_device_ts =
3351 rx_status->device_timestamp;
3352 if (elems.tim)
3353 sdata->vif.bss_conf.sync_dtim_count =
3354 elems.tim->dtim_count;
3355 else
3356 sdata->vif.bss_conf.sync_dtim_count = 0;
3357 }
3358 /* continue assoc process */
3359 ifmgd->assoc_data->timeout = jiffies;
3360 ifmgd->assoc_data->timeout_started = true;
3361 run_again(sdata, ifmgd->assoc_data->timeout);
3362 return;
3363 }
3364
3365 if (!ifmgd->associated ||
3366 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3367 return;
3368 bssid = ifmgd->associated->bssid;
3369
3370 /* Track average RSSI from the Beacon frames of the current AP */
3371 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
3372 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3373 ewma_beacon_signal_init(&ifmgd->ave_beacon_signal);
3374 ifmgd->last_cqm_event_signal = 0;
3375 ifmgd->count_beacon_signal = 1;
3376 ifmgd->last_ave_beacon_signal = 0;
3377 } else {
3378 ifmgd->count_beacon_signal++;
3379 }
3380
3381 ewma_beacon_signal_add(&ifmgd->ave_beacon_signal, -rx_status->signal);
3382
3383 if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3384 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3385 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3386 int last_sig = ifmgd->last_ave_beacon_signal;
3387 struct ieee80211_event event = {
3388 .type = RSSI_EVENT,
3389 };
3390
3391 /*
3392 * if signal crosses either of the boundaries, invoke callback
3393 * with appropriate parameters
3394 */
3395 if (sig > ifmgd->rssi_max_thold &&
3396 (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3397 ifmgd->last_ave_beacon_signal = sig;
3398 event.u.rssi.data = RSSI_EVENT_HIGH;
3399 drv_event_callback(local, sdata, &event);
3400 } else if (sig < ifmgd->rssi_min_thold &&
3401 (last_sig >= ifmgd->rssi_max_thold ||
3402 last_sig == 0)) {
3403 ifmgd->last_ave_beacon_signal = sig;
3404 event.u.rssi.data = RSSI_EVENT_LOW;
3405 drv_event_callback(local, sdata, &event);
3406 }
3407 }
3408
3409 if (bss_conf->cqm_rssi_thold &&
3410 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3411 !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3412 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3413 int last_event = ifmgd->last_cqm_event_signal;
3414 int thold = bss_conf->cqm_rssi_thold;
3415 int hyst = bss_conf->cqm_rssi_hyst;
3416
3417 if (sig < thold &&
3418 (last_event == 0 || sig < last_event - hyst)) {
3419 ifmgd->last_cqm_event_signal = sig;
3420 ieee80211_cqm_rssi_notify(
3421 &sdata->vif,
3422 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3423 sig, GFP_KERNEL);
3424 } else if (sig > thold &&
3425 (last_event == 0 || sig > last_event + hyst)) {
3426 ifmgd->last_cqm_event_signal = sig;
3427 ieee80211_cqm_rssi_notify(
3428 &sdata->vif,
3429 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3430 sig, GFP_KERNEL);
3431 }
3432 }
3433
3434 if (bss_conf->cqm_rssi_low &&
3435 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3436 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3437 int last_event = ifmgd->last_cqm_event_signal;
3438 int low = bss_conf->cqm_rssi_low;
3439 int high = bss_conf->cqm_rssi_high;
3440
3441 if (sig < low &&
3442 (last_event == 0 || last_event >= low)) {
3443 ifmgd->last_cqm_event_signal = sig;
3444 ieee80211_cqm_rssi_notify(
3445 &sdata->vif,
3446 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3447 sig, GFP_KERNEL);
3448 } else if (sig > high &&
3449 (last_event == 0 || last_event <= high)) {
3450 ifmgd->last_cqm_event_signal = sig;
3451 ieee80211_cqm_rssi_notify(
3452 &sdata->vif,
3453 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3454 sig, GFP_KERNEL);
3455 }
3456 }
3457
3458 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3459 mlme_dbg_ratelimited(sdata,
3460 "cancelling AP probe due to a received beacon\n");
3461 ieee80211_reset_ap_probe(sdata);
3462 }
3463
3464 /*
3465 * Push the beacon loss detection into the future since
3466 * we are processing a beacon from the AP just now.
3467 */
3468 ieee80211_sta_reset_beacon_monitor(sdata);
3469
3470 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3471 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3472 len - baselen, false, &elems,
3473 care_about_ies, ncrc);
3474
3475 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
3476 ieee80211_check_tim(elems.tim, elems.tim_len, ifmgd->aid)) {
3477 if (local->hw.conf.dynamic_ps_timeout > 0) {
3478 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3479 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3480 ieee80211_hw_config(local,
3481 IEEE80211_CONF_CHANGE_PS);
3482 }
3483 ieee80211_send_nullfunc(local, sdata, false);
3484 } else if (!local->pspolling && sdata->u.mgd.powersave) {
3485 local->pspolling = true;
3486
3487 /*
3488 * Here is assumed that the driver will be
3489 * able to send ps-poll frame and receive a
3490 * response even though power save mode is
3491 * enabled, but some drivers might require
3492 * to disable power save here. This needs
3493 * to be investigated.
3494 */
3495 ieee80211_send_pspoll(local, sdata);
3496 }
3497 }
3498
3499 if (sdata->vif.p2p ||
3500 sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) {
3501 struct ieee80211_p2p_noa_attr noa = {};
3502 int ret;
3503
3504 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3505 len - baselen,
3506 IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3507 (u8 *) &noa, sizeof(noa));
3508 if (ret >= 2) {
3509 if (sdata->u.mgd.p2p_noa_index != noa.index) {
3510 /* valid noa_attr and index changed */
3511 sdata->u.mgd.p2p_noa_index = noa.index;
3512 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3513 changed |= BSS_CHANGED_P2P_PS;
3514 /*
3515 * make sure we update all information, the CRC
3516 * mechanism doesn't look at P2P attributes.
3517 */
3518 ifmgd->beacon_crc_valid = false;
3519 }
3520 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3521 /* noa_attr not found and we had valid noa_attr before */
3522 sdata->u.mgd.p2p_noa_index = -1;
3523 memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3524 changed |= BSS_CHANGED_P2P_PS;
3525 ifmgd->beacon_crc_valid = false;
3526 }
3527 }
3528
3529 if (ifmgd->csa_waiting_bcn)
3530 ieee80211_chswitch_post_beacon(sdata);
3531
3532 /*
3533 * Update beacon timing and dtim count on every beacon appearance. This
3534 * will allow the driver to use the most updated values. Do it before
3535 * comparing this one with last received beacon.
3536 * IMPORTANT: These parameters would possibly be out of sync by the time
3537 * the driver will use them. The synchronized view is currently
3538 * guaranteed only in certain callbacks.
3539 */
3540 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3541 sdata->vif.bss_conf.sync_tsf =
3542 le64_to_cpu(mgmt->u.beacon.timestamp);
3543 sdata->vif.bss_conf.sync_device_ts =
3544 rx_status->device_timestamp;
3545 if (elems.tim)
3546 sdata->vif.bss_conf.sync_dtim_count =
3547 elems.tim->dtim_count;
3548 else
3549 sdata->vif.bss_conf.sync_dtim_count = 0;
3550 }
3551
3552 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3553 return;
3554 ifmgd->beacon_crc = ncrc;
3555 ifmgd->beacon_crc_valid = true;
3556
3557 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3558
3559 ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3560 rx_status->device_timestamp,
3561 &elems, true);
3562
3563 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3564 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3565 elems.wmm_param_len))
3566 changed |= BSS_CHANGED_QOS;
3567
3568 /*
3569 * If we haven't had a beacon before, tell the driver about the
3570 * DTIM period (and beacon timing if desired) now.
3571 */
3572 if (!ifmgd->have_beacon) {
3573 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3574 if (elems.tim)
3575 bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3576 else
3577 bss_conf->dtim_period = 1;
3578
3579 changed |= BSS_CHANGED_BEACON_INFO;
3580 ifmgd->have_beacon = true;
3581
3582 mutex_lock(&local->iflist_mtx);
3583 ieee80211_recalc_ps(local);
3584 mutex_unlock(&local->iflist_mtx);
3585
3586 ieee80211_recalc_ps_vif(sdata);
3587 }
3588
3589 if (elems.erp_info) {
3590 erp_valid = true;
3591 erp_value = elems.erp_info[0];
3592 } else {
3593 erp_valid = false;
3594 }
3595 changed |= ieee80211_handle_bss_capability(sdata,
3596 le16_to_cpu(mgmt->u.beacon.capab_info),
3597 erp_valid, erp_value);
3598
3599 mutex_lock(&local->sta_mtx);
3600 sta = sta_info_get(sdata, bssid);
3601
3602 if (ieee80211_config_bw(sdata, sta,
3603 elems.ht_cap_elem, elems.ht_operation,
3604 elems.vht_operation, bssid, &changed)) {
3605 mutex_unlock(&local->sta_mtx);
3606 sdata_info(sdata,
3607 "failed to follow AP %pM bandwidth change, disconnect\n",
3608 bssid);
3609 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3610 WLAN_REASON_DEAUTH_LEAVING,
3611 true, deauth_buf);
3612 ieee80211_report_disconnect(sdata, deauth_buf,
3613 sizeof(deauth_buf), true,
3614 WLAN_REASON_DEAUTH_LEAVING);
3615 return;
3616 }
3617
3618 if (sta && elems.opmode_notif)
3619 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3620 rx_status->band);
3621 mutex_unlock(&local->sta_mtx);
3622
3623 changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
3624 elems.country_elem,
3625 elems.country_elem_len,
3626 elems.pwr_constr_elem,
3627 elems.cisco_dtpc_elem);
3628
3629 ieee80211_bss_info_change_notify(sdata, changed);
3630 }
3631
3632 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3633 struct sk_buff *skb)
3634 {
3635 struct ieee80211_rx_status *rx_status;
3636 struct ieee80211_mgmt *mgmt;
3637 u16 fc;
3638 struct ieee802_11_elems elems;
3639 int ies_len;
3640
3641 rx_status = (struct ieee80211_rx_status *) skb->cb;
3642 mgmt = (struct ieee80211_mgmt *) skb->data;
3643 fc = le16_to_cpu(mgmt->frame_control);
3644
3645 sdata_lock(sdata);
3646
3647 switch (fc & IEEE80211_FCTL_STYPE) {
3648 case IEEE80211_STYPE_BEACON:
3649 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3650 break;
3651 case IEEE80211_STYPE_PROBE_RESP:
3652 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3653 break;
3654 case IEEE80211_STYPE_AUTH:
3655 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3656 break;
3657 case IEEE80211_STYPE_DEAUTH:
3658 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3659 break;
3660 case IEEE80211_STYPE_DISASSOC:
3661 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3662 break;
3663 case IEEE80211_STYPE_ASSOC_RESP:
3664 case IEEE80211_STYPE_REASSOC_RESP:
3665 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3666 break;
3667 case IEEE80211_STYPE_ACTION:
3668 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3669 ies_len = skb->len -
3670 offsetof(struct ieee80211_mgmt,
3671 u.action.u.chan_switch.variable);
3672
3673 if (ies_len < 0)
3674 break;
3675
3676 ieee802_11_parse_elems(
3677 mgmt->u.action.u.chan_switch.variable,
3678 ies_len, true, &elems);
3679
3680 if (elems.parse_error)
3681 break;
3682
3683 ieee80211_sta_process_chanswitch(sdata,
3684 rx_status->mactime,
3685 rx_status->device_timestamp,
3686 &elems, false);
3687 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3688 ies_len = skb->len -
3689 offsetof(struct ieee80211_mgmt,
3690 u.action.u.ext_chan_switch.variable);
3691
3692 if (ies_len < 0)
3693 break;
3694
3695 ieee802_11_parse_elems(
3696 mgmt->u.action.u.ext_chan_switch.variable,
3697 ies_len, true, &elems);
3698
3699 if (elems.parse_error)
3700 break;
3701
3702 /* for the handling code pretend this was also an IE */
3703 elems.ext_chansw_ie =
3704 &mgmt->u.action.u.ext_chan_switch.data;
3705
3706 ieee80211_sta_process_chanswitch(sdata,
3707 rx_status->mactime,
3708 rx_status->device_timestamp,
3709 &elems, false);
3710 }
3711 break;
3712 }
3713 sdata_unlock(sdata);
3714 }
3715
3716 static void ieee80211_sta_timer(struct timer_list *t)
3717 {
3718 struct ieee80211_sub_if_data *sdata =
3719 from_timer(sdata, t, u.mgd.timer);
3720
3721 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3722 }
3723
3724 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3725 u8 *bssid, u8 reason, bool tx)
3726 {
3727 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3728
3729 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3730 tx, frame_buf);
3731
3732 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
3733 reason);
3734 }
3735
3736 static int ieee80211_auth(struct ieee80211_sub_if_data *sdata)
3737 {
3738 struct ieee80211_local *local = sdata->local;
3739 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3740 struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3741 u32 tx_flags = 0;
3742 u16 trans = 1;
3743 u16 status = 0;
3744
3745 sdata_assert_lock(sdata);
3746
3747 if (WARN_ON_ONCE(!auth_data))
3748 return -EINVAL;
3749
3750 auth_data->tries++;
3751
3752 if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3753 sdata_info(sdata, "authentication with %pM timed out\n",
3754 auth_data->bss->bssid);
3755
3756 /*
3757 * Most likely AP is not in the range so remove the
3758 * bss struct for that AP.
3759 */
3760 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3761
3762 return -ETIMEDOUT;
3763 }
3764
3765 drv_mgd_prepare_tx(local, sdata);
3766
3767 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3768 auth_data->bss->bssid, auth_data->tries,
3769 IEEE80211_AUTH_MAX_TRIES);
3770
3771 auth_data->expected_transaction = 2;
3772
3773 if (auth_data->algorithm == WLAN_AUTH_SAE) {
3774 trans = auth_data->sae_trans;
3775 status = auth_data->sae_status;
3776 auth_data->expected_transaction = trans;
3777 }
3778
3779 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3780 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3781 IEEE80211_TX_INTFL_MLME_CONN_TX;
3782
3783 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3784 auth_data->data, auth_data->data_len,
3785 auth_data->bss->bssid,
3786 auth_data->bss->bssid, NULL, 0, 0,
3787 tx_flags);
3788
3789 if (tx_flags == 0) {
3790 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3791 auth_data->timeout_started = true;
3792 run_again(sdata, auth_data->timeout);
3793 } else {
3794 auth_data->timeout =
3795 round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3796 auth_data->timeout_started = true;
3797 run_again(sdata, auth_data->timeout);
3798 }
3799
3800 return 0;
3801 }
3802
3803 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3804 {
3805 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3806 struct ieee80211_local *local = sdata->local;
3807
3808 sdata_assert_lock(sdata);
3809
3810 assoc_data->tries++;
3811 if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3812 sdata_info(sdata, "association with %pM timed out\n",
3813 assoc_data->bss->bssid);
3814
3815 /*
3816 * Most likely AP is not in the range so remove the
3817 * bss struct for that AP.
3818 */
3819 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3820
3821 return -ETIMEDOUT;
3822 }
3823
3824 sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3825 assoc_data->bss->bssid, assoc_data->tries,
3826 IEEE80211_ASSOC_MAX_TRIES);
3827 ieee80211_send_assoc(sdata);
3828
3829 if (!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3830 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3831 assoc_data->timeout_started = true;
3832 run_again(sdata, assoc_data->timeout);
3833 } else {
3834 assoc_data->timeout =
3835 round_jiffies_up(jiffies +
3836 IEEE80211_ASSOC_TIMEOUT_LONG);
3837 assoc_data->timeout_started = true;
3838 run_again(sdata, assoc_data->timeout);
3839 }
3840
3841 return 0;
3842 }
3843
3844 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3845 __le16 fc, bool acked)
3846 {
3847 struct ieee80211_local *local = sdata->local;
3848
3849 sdata->u.mgd.status_fc = fc;
3850 sdata->u.mgd.status_acked = acked;
3851 sdata->u.mgd.status_received = true;
3852
3853 ieee80211_queue_work(&local->hw, &sdata->work);
3854 }
3855
3856 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3857 {
3858 struct ieee80211_local *local = sdata->local;
3859 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3860
3861 sdata_lock(sdata);
3862
3863 if (ifmgd->status_received) {
3864 __le16 fc = ifmgd->status_fc;
3865 bool status_acked = ifmgd->status_acked;
3866
3867 ifmgd->status_received = false;
3868 if (ifmgd->auth_data && ieee80211_is_auth(fc)) {
3869 if (status_acked) {
3870 ifmgd->auth_data->timeout =
3871 jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3872 run_again(sdata, ifmgd->auth_data->timeout);
3873 } else {
3874 ifmgd->auth_data->timeout = jiffies - 1;
3875 }
3876 ifmgd->auth_data->timeout_started = true;
3877 } else if (ifmgd->assoc_data &&
3878 (ieee80211_is_assoc_req(fc) ||
3879 ieee80211_is_reassoc_req(fc))) {
3880 if (status_acked) {
3881 ifmgd->assoc_data->timeout =
3882 jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3883 run_again(sdata, ifmgd->assoc_data->timeout);
3884 } else {
3885 ifmgd->assoc_data->timeout = jiffies - 1;
3886 }
3887 ifmgd->assoc_data->timeout_started = true;
3888 }
3889 }
3890
3891 if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3892 time_after(jiffies, ifmgd->auth_data->timeout)) {
3893 if (ifmgd->auth_data->done) {
3894 /*
3895 * ok ... we waited for assoc but userspace didn't,
3896 * so let's just kill the auth data
3897 */
3898 ieee80211_destroy_auth_data(sdata, false);
3899 } else if (ieee80211_auth(sdata)) {
3900 u8 bssid[ETH_ALEN];
3901 struct ieee80211_event event = {
3902 .type = MLME_EVENT,
3903 .u.mlme.data = AUTH_EVENT,
3904 .u.mlme.status = MLME_TIMEOUT,
3905 };
3906
3907 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3908
3909 ieee80211_destroy_auth_data(sdata, false);
3910
3911 cfg80211_auth_timeout(sdata->dev, bssid);
3912 drv_event_callback(sdata->local, sdata, &event);
3913 }
3914 } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3915 run_again(sdata, ifmgd->auth_data->timeout);
3916
3917 if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3918 time_after(jiffies, ifmgd->assoc_data->timeout)) {
3919 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3920 ieee80211_do_assoc(sdata)) {
3921 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3922 struct ieee80211_event event = {
3923 .type = MLME_EVENT,
3924 .u.mlme.data = ASSOC_EVENT,
3925 .u.mlme.status = MLME_TIMEOUT,
3926 };
3927
3928 ieee80211_destroy_assoc_data(sdata, false, false);
3929 cfg80211_assoc_timeout(sdata->dev, bss);
3930 drv_event_callback(sdata->local, sdata, &event);
3931 }
3932 } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3933 run_again(sdata, ifmgd->assoc_data->timeout);
3934
3935 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3936 ifmgd->associated) {
3937 u8 bssid[ETH_ALEN];
3938 int max_tries;
3939
3940 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3941
3942 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3943 max_tries = max_nullfunc_tries;
3944 else
3945 max_tries = max_probe_tries;
3946
3947 /* ACK received for nullfunc probing frame */
3948 if (!ifmgd->probe_send_count)
3949 ieee80211_reset_ap_probe(sdata);
3950 else if (ifmgd->nullfunc_failed) {
3951 if (ifmgd->probe_send_count < max_tries) {
3952 mlme_dbg(sdata,
3953 "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3954 bssid, ifmgd->probe_send_count,
3955 max_tries);
3956 ieee80211_mgd_probe_ap_send(sdata);
3957 } else {
3958 mlme_dbg(sdata,
3959 "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3960 bssid);
3961 ieee80211_sta_connection_lost(sdata, bssid,
3962 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3963 false);
3964 }
3965 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3966 run_again(sdata, ifmgd->probe_timeout);
3967 else if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3968 mlme_dbg(sdata,
3969 "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3970 bssid, probe_wait_ms);
3971 ieee80211_sta_connection_lost(sdata, bssid,
3972 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3973 } else if (ifmgd->probe_send_count < max_tries) {
3974 mlme_dbg(sdata,
3975 "No probe response from AP %pM after %dms, try %d/%i\n",
3976 bssid, probe_wait_ms,
3977 ifmgd->probe_send_count, max_tries);
3978 ieee80211_mgd_probe_ap_send(sdata);
3979 } else {
3980 /*
3981 * We actually lost the connection ... or did we?
3982 * Let's make sure!
3983 */
3984 mlme_dbg(sdata,
3985 "No probe response from AP %pM after %dms, disconnecting.\n",
3986 bssid, probe_wait_ms);
3987
3988 ieee80211_sta_connection_lost(sdata, bssid,
3989 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3990 }
3991 }
3992
3993 sdata_unlock(sdata);
3994 }
3995
3996 static void ieee80211_sta_bcn_mon_timer(struct timer_list *t)
3997 {
3998 struct ieee80211_sub_if_data *sdata =
3999 from_timer(sdata, t, u.mgd.bcn_mon_timer);
4000 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4001
4002 if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
4003 return;
4004
4005 sdata->u.mgd.connection_loss = false;
4006 ieee80211_queue_work(&sdata->local->hw,
4007 &sdata->u.mgd.beacon_connection_loss_work);
4008 }
4009
4010 static void ieee80211_sta_conn_mon_timer(struct timer_list *t)
4011 {
4012 struct ieee80211_sub_if_data *sdata =
4013 from_timer(sdata, t, u.mgd.conn_mon_timer);
4014 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4015 struct ieee80211_local *local = sdata->local;
4016
4017 if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
4018 return;
4019
4020 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
4021 }
4022
4023 static void ieee80211_sta_monitor_work(struct work_struct *work)
4024 {
4025 struct ieee80211_sub_if_data *sdata =
4026 container_of(work, struct ieee80211_sub_if_data,
4027 u.mgd.monitor_work);
4028
4029 ieee80211_mgd_probe_ap(sdata, false);
4030 }
4031
4032 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
4033 {
4034 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
4035 __ieee80211_stop_poll(sdata);
4036
4037 /* let's probe the connection once */
4038 if (!ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
4039 ieee80211_queue_work(&sdata->local->hw,
4040 &sdata->u.mgd.monitor_work);
4041 }
4042 }
4043
4044 #ifdef CONFIG_PM
4045 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
4046 {
4047 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4048 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4049
4050 sdata_lock(sdata);
4051
4052 if (ifmgd->auth_data || ifmgd->assoc_data) {
4053 const u8 *bssid = ifmgd->auth_data ?
4054 ifmgd->auth_data->bss->bssid :
4055 ifmgd->assoc_data->bss->bssid;
4056
4057 /*
4058 * If we are trying to authenticate / associate while suspending,
4059 * cfg80211 won't know and won't actually abort those attempts,
4060 * thus we need to do that ourselves.
4061 */
4062 ieee80211_send_deauth_disassoc(sdata, bssid,
4063 IEEE80211_STYPE_DEAUTH,
4064 WLAN_REASON_DEAUTH_LEAVING,
4065 false, frame_buf);
4066 if (ifmgd->assoc_data)
4067 ieee80211_destroy_assoc_data(sdata, false, true);
4068 if (ifmgd->auth_data)
4069 ieee80211_destroy_auth_data(sdata, false);
4070 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4071 IEEE80211_DEAUTH_FRAME_LEN);
4072 }
4073
4074 /* This is a bit of a hack - we should find a better and more generic
4075 * solution to this. Normally when suspending, cfg80211 will in fact
4076 * deauthenticate. However, it doesn't (and cannot) stop an ongoing
4077 * auth (not so important) or assoc (this is the problem) process.
4078 *
4079 * As a consequence, it can happen that we are in the process of both
4080 * associating and suspending, and receive an association response
4081 * after cfg80211 has checked if it needs to disconnect, but before
4082 * we actually set the flag to drop incoming frames. This will then
4083 * cause the workqueue flush to process the association response in
4084 * the suspend, resulting in a successful association just before it
4085 * tries to remove the interface from the driver, which now though
4086 * has a channel context assigned ... this results in issues.
4087 *
4088 * To work around this (for now) simply deauth here again if we're
4089 * now connected.
4090 */
4091 if (ifmgd->associated && !sdata->local->wowlan) {
4092 u8 bssid[ETH_ALEN];
4093 struct cfg80211_deauth_request req = {
4094 .reason_code = WLAN_REASON_DEAUTH_LEAVING,
4095 .bssid = bssid,
4096 };
4097
4098 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
4099 ieee80211_mgd_deauth(sdata, &req);
4100 }
4101
4102 sdata_unlock(sdata);
4103 }
4104
4105 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
4106 {
4107 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4108
4109 sdata_lock(sdata);
4110 if (!ifmgd->associated) {
4111 sdata_unlock(sdata);
4112 return;
4113 }
4114
4115 if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
4116 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
4117 mlme_dbg(sdata, "driver requested disconnect after resume\n");
4118 ieee80211_sta_connection_lost(sdata,
4119 ifmgd->associated->bssid,
4120 WLAN_REASON_UNSPECIFIED,
4121 true);
4122 sdata_unlock(sdata);
4123 return;
4124 }
4125 sdata_unlock(sdata);
4126 }
4127 #endif
4128
4129 /* interface setup */
4130 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
4131 {
4132 struct ieee80211_if_managed *ifmgd;
4133
4134 ifmgd = &sdata->u.mgd;
4135 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
4136 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
4137 INIT_WORK(&ifmgd->beacon_connection_loss_work,
4138 ieee80211_beacon_connection_loss_work);
4139 INIT_WORK(&ifmgd->csa_connection_drop_work,
4140 ieee80211_csa_connection_drop_work);
4141 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
4142 INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
4143 ieee80211_tdls_peer_del_work);
4144 timer_setup(&ifmgd->timer, ieee80211_sta_timer, 0);
4145 timer_setup(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer, 0);
4146 timer_setup(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer, 0);
4147 timer_setup(&ifmgd->chswitch_timer, ieee80211_chswitch_timer, 0);
4148 INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
4149 ieee80211_sta_handle_tspec_ac_params_wk);
4150
4151 ifmgd->flags = 0;
4152 ifmgd->powersave = sdata->wdev.ps;
4153 ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
4154 ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
4155 ifmgd->p2p_noa_index = -1;
4156
4157 if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4158 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
4159 else
4160 ifmgd->req_smps = IEEE80211_SMPS_OFF;
4161
4162 /* Setup TDLS data */
4163 spin_lock_init(&ifmgd->teardown_lock);
4164 ifmgd->teardown_skb = NULL;
4165 ifmgd->orig_teardown_skb = NULL;
4166 }
4167
4168 /* scan finished notification */
4169 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
4170 {
4171 struct ieee80211_sub_if_data *sdata;
4172
4173 /* Restart STA timers */
4174 rcu_read_lock();
4175 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4176 if (ieee80211_sdata_running(sdata))
4177 ieee80211_restart_sta_timer(sdata);
4178 }
4179 rcu_read_unlock();
4180 }
4181
4182 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
4183 struct cfg80211_bss *cbss)
4184 {
4185 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4186 const u8 *ht_cap_ie, *vht_cap_ie;
4187 const struct ieee80211_ht_cap *ht_cap;
4188 const struct ieee80211_vht_cap *vht_cap;
4189 u8 chains = 1;
4190
4191 if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
4192 return chains;
4193
4194 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4195 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
4196 ht_cap = (void *)(ht_cap_ie + 2);
4197 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
4198 /*
4199 * TODO: use "Tx Maximum Number Spatial Streams Supported" and
4200 * "Tx Unequal Modulation Supported" fields.
4201 */
4202 }
4203
4204 if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
4205 return chains;
4206
4207 vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4208 if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
4209 u8 nss;
4210 u16 tx_mcs_map;
4211
4212 vht_cap = (void *)(vht_cap_ie + 2);
4213 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
4214 for (nss = 8; nss > 0; nss--) {
4215 if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
4216 IEEE80211_VHT_MCS_NOT_SUPPORTED)
4217 break;
4218 }
4219 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
4220 chains = max(chains, nss);
4221 }
4222
4223 return chains;
4224 }
4225
4226 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
4227 struct cfg80211_bss *cbss)
4228 {
4229 struct ieee80211_local *local = sdata->local;
4230 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4231 const struct ieee80211_ht_cap *ht_cap = NULL;
4232 const struct ieee80211_ht_operation *ht_oper = NULL;
4233 const struct ieee80211_vht_operation *vht_oper = NULL;
4234 struct ieee80211_supported_band *sband;
4235 struct cfg80211_chan_def chandef;
4236 int ret;
4237 u32 i;
4238 bool have_80mhz;
4239
4240 sband = local->hw.wiphy->bands[cbss->channel->band];
4241
4242 ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
4243 IEEE80211_STA_DISABLE_80P80MHZ |
4244 IEEE80211_STA_DISABLE_160MHZ);
4245
4246 rcu_read_lock();
4247
4248 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
4249 sband->ht_cap.ht_supported) {
4250 const u8 *ht_oper_ie, *ht_cap_ie;
4251
4252 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4253 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
4254 ht_oper = (void *)(ht_oper_ie + 2);
4255
4256 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4257 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
4258 ht_cap = (void *)(ht_cap_ie + 2);
4259
4260 if (!ht_cap) {
4261 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4262 ht_oper = NULL;
4263 }
4264 }
4265
4266 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4267 sband->vht_cap.vht_supported) {
4268 const u8 *vht_oper_ie, *vht_cap;
4269
4270 vht_oper_ie = ieee80211_bss_get_ie(cbss,
4271 WLAN_EID_VHT_OPERATION);
4272 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
4273 vht_oper = (void *)(vht_oper_ie + 2);
4274 if (vht_oper && !ht_oper) {
4275 vht_oper = NULL;
4276 sdata_info(sdata,
4277 "AP advertised VHT without HT, disabling both\n");
4278 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4279 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4280 }
4281
4282 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4283 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
4284 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4285 vht_oper = NULL;
4286 }
4287 }
4288
4289 /* Allow VHT if at least one channel on the sband supports 80 MHz */
4290 have_80mhz = false;
4291 for (i = 0; i < sband->n_channels; i++) {
4292 if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
4293 IEEE80211_CHAN_NO_80MHZ))
4294 continue;
4295
4296 have_80mhz = true;
4297 break;
4298 }
4299
4300 if (!have_80mhz)
4301 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4302
4303 ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
4304 cbss->channel,
4305 ht_oper, vht_oper,
4306 &chandef, false);
4307
4308 sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
4309 local->rx_chains);
4310
4311 rcu_read_unlock();
4312
4313 /* will change later if needed */
4314 sdata->smps_mode = IEEE80211_SMPS_OFF;
4315
4316 mutex_lock(&local->mtx);
4317 /*
4318 * If this fails (possibly due to channel context sharing
4319 * on incompatible channels, e.g. 80+80 and 160 sharing the
4320 * same control channel) try to use a smaller bandwidth.
4321 */
4322 ret = ieee80211_vif_use_channel(sdata, &chandef,
4323 IEEE80211_CHANCTX_SHARED);
4324
4325 /* don't downgrade for 5 and 10 MHz channels, though. */
4326 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
4327 chandef.width == NL80211_CHAN_WIDTH_10)
4328 goto out;
4329
4330 while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4331 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4332 ret = ieee80211_vif_use_channel(sdata, &chandef,
4333 IEEE80211_CHANCTX_SHARED);
4334 }
4335 out:
4336 mutex_unlock(&local->mtx);
4337 return ret;
4338 }
4339
4340 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4341 struct cfg80211_bss *cbss, bool assoc,
4342 bool override)
4343 {
4344 struct ieee80211_local *local = sdata->local;
4345 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4346 struct ieee80211_bss *bss = (void *)cbss->priv;
4347 struct sta_info *new_sta = NULL;
4348 struct ieee80211_supported_band *sband;
4349 bool have_sta = false;
4350 int err;
4351
4352 sband = local->hw.wiphy->bands[cbss->channel->band];
4353
4354 if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
4355 return -EINVAL;
4356
4357 /* If a reconfig is happening, bail out */
4358 if (local->in_reconfig)
4359 return -EBUSY;
4360
4361 if (assoc) {
4362 rcu_read_lock();
4363 have_sta = sta_info_get(sdata, cbss->bssid);
4364 rcu_read_unlock();
4365 }
4366
4367 if (!have_sta) {
4368 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
4369 if (!new_sta)
4370 return -ENOMEM;
4371 }
4372
4373 /*
4374 * Set up the information for the new channel before setting the
4375 * new channel. We can't - completely race-free - change the basic
4376 * rates bitmap and the channel (sband) that it refers to, but if
4377 * we set it up before we at least avoid calling into the driver's
4378 * bss_info_changed() method with invalid information (since we do
4379 * call that from changing the channel - only for IDLE and perhaps
4380 * some others, but ...).
4381 *
4382 * So to avoid that, just set up all the new information before the
4383 * channel, but tell the driver to apply it only afterwards, since
4384 * it might need the new channel for that.
4385 */
4386 if (new_sta) {
4387 u32 rates = 0, basic_rates = 0;
4388 bool have_higher_than_11mbit;
4389 int min_rate = INT_MAX, min_rate_index = -1;
4390 const struct cfg80211_bss_ies *ies;
4391 int shift = ieee80211_vif_get_shift(&sdata->vif);
4392
4393 ieee80211_get_rates(sband, bss->supp_rates,
4394 bss->supp_rates_len,
4395 &rates, &basic_rates,
4396 &have_higher_than_11mbit,
4397 &min_rate, &min_rate_index,
4398 shift);
4399
4400 /*
4401 * This used to be a workaround for basic rates missing
4402 * in the association response frame. Now that we no
4403 * longer use the basic rates from there, it probably
4404 * doesn't happen any more, but keep the workaround so
4405 * in case some *other* APs are buggy in different ways
4406 * we can connect -- with a warning.
4407 */
4408 if (!basic_rates && min_rate_index >= 0) {
4409 sdata_info(sdata,
4410 "No basic rates, using min rate instead\n");
4411 basic_rates = BIT(min_rate_index);
4412 }
4413
4414 new_sta->sta.supp_rates[cbss->channel->band] = rates;
4415 sdata->vif.bss_conf.basic_rates = basic_rates;
4416
4417 /* cf. IEEE 802.11 9.2.12 */
4418 if (cbss->channel->band == NL80211_BAND_2GHZ &&
4419 have_higher_than_11mbit)
4420 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
4421 else
4422 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
4423
4424 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
4425
4426 /* set timing information */
4427 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
4428 rcu_read_lock();
4429 ies = rcu_dereference(cbss->beacon_ies);
4430 if (ies) {
4431 const u8 *tim_ie;
4432
4433 sdata->vif.bss_conf.sync_tsf = ies->tsf;
4434 sdata->vif.bss_conf.sync_device_ts =
4435 bss->device_ts_beacon;
4436 tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4437 ies->data, ies->len);
4438 if (tim_ie && tim_ie[1] >= 2)
4439 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
4440 else
4441 sdata->vif.bss_conf.sync_dtim_count = 0;
4442 } else if (!ieee80211_hw_check(&sdata->local->hw,
4443 TIMING_BEACON_ONLY)) {
4444 ies = rcu_dereference(cbss->proberesp_ies);
4445 /* must be non-NULL since beacon IEs were NULL */
4446 sdata->vif.bss_conf.sync_tsf = ies->tsf;
4447 sdata->vif.bss_conf.sync_device_ts =
4448 bss->device_ts_presp;
4449 sdata->vif.bss_conf.sync_dtim_count = 0;
4450 } else {
4451 sdata->vif.bss_conf.sync_tsf = 0;
4452 sdata->vif.bss_conf.sync_device_ts = 0;
4453 sdata->vif.bss_conf.sync_dtim_count = 0;
4454 }
4455 rcu_read_unlock();
4456 }
4457
4458 if (new_sta || override) {
4459 err = ieee80211_prep_channel(sdata, cbss);
4460 if (err) {
4461 if (new_sta)
4462 sta_info_free(local, new_sta);
4463 return -EINVAL;
4464 }
4465 }
4466
4467 if (new_sta) {
4468 /*
4469 * tell driver about BSSID, basic rates and timing
4470 * this was set up above, before setting the channel
4471 */
4472 ieee80211_bss_info_change_notify(sdata,
4473 BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4474 BSS_CHANGED_BEACON_INT);
4475
4476 if (assoc)
4477 sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4478
4479 err = sta_info_insert(new_sta);
4480 new_sta = NULL;
4481 if (err) {
4482 sdata_info(sdata,
4483 "failed to insert STA entry for the AP (error %d)\n",
4484 err);
4485 return err;
4486 }
4487 } else
4488 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4489
4490 /* Cancel scan to ensure that nothing interferes with connection */
4491 if (local->scanning)
4492 ieee80211_scan_cancel(local);
4493
4494 return 0;
4495 }
4496
4497 /* config hooks */
4498 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4499 struct cfg80211_auth_request *req)
4500 {
4501 struct ieee80211_local *local = sdata->local;
4502 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4503 struct ieee80211_mgd_auth_data *auth_data;
4504 u16 auth_alg;
4505 int err;
4506
4507 /* prepare auth data structure */
4508
4509 switch (req->auth_type) {
4510 case NL80211_AUTHTYPE_OPEN_SYSTEM:
4511 auth_alg = WLAN_AUTH_OPEN;
4512 break;
4513 case NL80211_AUTHTYPE_SHARED_KEY:
4514 if (IS_ERR(local->wep_tx_tfm))
4515 return -EOPNOTSUPP;
4516 auth_alg = WLAN_AUTH_SHARED_KEY;
4517 break;
4518 case NL80211_AUTHTYPE_FT:
4519 auth_alg = WLAN_AUTH_FT;
4520 break;
4521 case NL80211_AUTHTYPE_NETWORK_EAP:
4522 auth_alg = WLAN_AUTH_LEAP;
4523 break;
4524 case NL80211_AUTHTYPE_SAE:
4525 auth_alg = WLAN_AUTH_SAE;
4526 break;
4527 case NL80211_AUTHTYPE_FILS_SK:
4528 auth_alg = WLAN_AUTH_FILS_SK;
4529 break;
4530 case NL80211_AUTHTYPE_FILS_SK_PFS:
4531 auth_alg = WLAN_AUTH_FILS_SK_PFS;
4532 break;
4533 case NL80211_AUTHTYPE_FILS_PK:
4534 auth_alg = WLAN_AUTH_FILS_PK;
4535 break;
4536 default:
4537 return -EOPNOTSUPP;
4538 }
4539
4540 auth_data = kzalloc(sizeof(*auth_data) + req->auth_data_len +
4541 req->ie_len, GFP_KERNEL);
4542 if (!auth_data)
4543 return -ENOMEM;
4544
4545 auth_data->bss = req->bss;
4546
4547 if (req->auth_data_len >= 4) {
4548 if (req->auth_type == NL80211_AUTHTYPE_SAE) {
4549 __le16 *pos = (__le16 *) req->auth_data;
4550
4551 auth_data->sae_trans = le16_to_cpu(pos[0]);
4552 auth_data->sae_status = le16_to_cpu(pos[1]);
4553 }
4554 memcpy(auth_data->data, req->auth_data + 4,
4555 req->auth_data_len - 4);
4556 auth_data->data_len += req->auth_data_len - 4;
4557 }
4558
4559 if (req->ie && req->ie_len) {
4560 memcpy(&auth_data->data[auth_data->data_len],
4561 req->ie, req->ie_len);
4562 auth_data->data_len += req->ie_len;
4563 }
4564
4565 if (req->key && req->key_len) {
4566 auth_data->key_len = req->key_len;
4567 auth_data->key_idx = req->key_idx;
4568 memcpy(auth_data->key, req->key, req->key_len);
4569 }
4570
4571 auth_data->algorithm = auth_alg;
4572
4573 /* try to authenticate/probe */
4574
4575 if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4576 ifmgd->assoc_data) {
4577 err = -EBUSY;
4578 goto err_free;
4579 }
4580
4581 if (ifmgd->auth_data)
4582 ieee80211_destroy_auth_data(sdata, false);
4583
4584 /* prep auth_data so we don't go into idle on disassoc */
4585 ifmgd->auth_data = auth_data;
4586
4587 if (ifmgd->associated) {
4588 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4589
4590 sdata_info(sdata,
4591 "disconnect from AP %pM for new auth to %pM\n",
4592 ifmgd->associated->bssid, req->bss->bssid);
4593 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4594 WLAN_REASON_UNSPECIFIED,
4595 false, frame_buf);
4596
4597 ieee80211_report_disconnect(sdata, frame_buf,
4598 sizeof(frame_buf), true,
4599 WLAN_REASON_UNSPECIFIED);
4600 }
4601
4602 sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4603
4604 err = ieee80211_prep_connection(sdata, req->bss, false, false);
4605 if (err)
4606 goto err_clear;
4607
4608 err = ieee80211_auth(sdata);
4609 if (err) {
4610 sta_info_destroy_addr(sdata, req->bss->bssid);
4611 goto err_clear;
4612 }
4613
4614 /* hold our own reference */
4615 cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4616 return 0;
4617
4618 err_clear:
4619 eth_zero_addr(ifmgd->bssid);
4620 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4621 ifmgd->auth_data = NULL;
4622 mutex_lock(&sdata->local->mtx);
4623 ieee80211_vif_release_channel(sdata);
4624 mutex_unlock(&sdata->local->mtx);
4625 err_free:
4626 kfree(auth_data);
4627 return err;
4628 }
4629
4630 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4631 struct cfg80211_assoc_request *req)
4632 {
4633 struct ieee80211_local *local = sdata->local;
4634 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4635 struct ieee80211_bss *bss = (void *)req->bss->priv;
4636 struct ieee80211_mgd_assoc_data *assoc_data;
4637 const struct cfg80211_bss_ies *beacon_ies;
4638 struct ieee80211_supported_band *sband;
4639 const u8 *ssidie, *ht_ie, *vht_ie;
4640 int i, err;
4641 bool override = false;
4642
4643 assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4644 if (!assoc_data)
4645 return -ENOMEM;
4646
4647 rcu_read_lock();
4648 ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4649 if (!ssidie) {
4650 rcu_read_unlock();
4651 kfree(assoc_data);
4652 return -EINVAL;
4653 }
4654 memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4655 assoc_data->ssid_len = ssidie[1];
4656 rcu_read_unlock();
4657
4658 if (ifmgd->associated) {
4659 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4660
4661 sdata_info(sdata,
4662 "disconnect from AP %pM for new assoc to %pM\n",
4663 ifmgd->associated->bssid, req->bss->bssid);
4664 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4665 WLAN_REASON_UNSPECIFIED,
4666 false, frame_buf);
4667
4668 ieee80211_report_disconnect(sdata, frame_buf,
4669 sizeof(frame_buf), true,
4670 WLAN_REASON_UNSPECIFIED);
4671 }
4672
4673 if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4674 err = -EBUSY;
4675 goto err_free;
4676 }
4677
4678 if (ifmgd->assoc_data) {
4679 err = -EBUSY;
4680 goto err_free;
4681 }
4682
4683 if (ifmgd->auth_data) {
4684 bool match;
4685
4686 /* keep sta info, bssid if matching */
4687 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4688 ieee80211_destroy_auth_data(sdata, match);
4689 }
4690
4691 /* prepare assoc data */
4692
4693 ifmgd->beacon_crc_valid = false;
4694
4695 assoc_data->wmm = bss->wmm_used &&
4696 (local->hw.queues >= IEEE80211_NUM_ACS);
4697
4698 /*
4699 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4700 * We still associate in non-HT mode (11a/b/g) if any one of these
4701 * ciphers is configured as pairwise.
4702 * We can set this to true for non-11n hardware, that'll be checked
4703 * separately along with the peer capabilities.
4704 */
4705 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4706 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4707 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4708 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4709 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4710 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4711 netdev_info(sdata->dev,
4712 "disabling HT/VHT due to WEP/TKIP use\n");
4713 }
4714 }
4715
4716 /* Also disable HT if we don't support it or the AP doesn't use WMM */
4717 sband = local->hw.wiphy->bands[req->bss->channel->band];
4718 if (!sband->ht_cap.ht_supported ||
4719 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4720 ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4721 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4722 if (!bss->wmm_used &&
4723 !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4724 netdev_info(sdata->dev,
4725 "disabling HT as WMM/QoS is not supported by the AP\n");
4726 }
4727
4728 /* disable VHT if we don't support it or the AP doesn't use WMM */
4729 if (!sband->vht_cap.vht_supported ||
4730 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4731 ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4732 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4733 if (!bss->wmm_used &&
4734 !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4735 netdev_info(sdata->dev,
4736 "disabling VHT as WMM/QoS is not supported by the AP\n");
4737 }
4738
4739 memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4740 memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4741 sizeof(ifmgd->ht_capa_mask));
4742
4743 memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4744 memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4745 sizeof(ifmgd->vht_capa_mask));
4746
4747 if (req->ie && req->ie_len) {
4748 memcpy(assoc_data->ie, req->ie, req->ie_len);
4749 assoc_data->ie_len = req->ie_len;
4750 }
4751
4752 if (req->fils_kek) {
4753 /* should already be checked in cfg80211 - so warn */
4754 if (WARN_ON(req->fils_kek_len > FILS_MAX_KEK_LEN)) {
4755 err = -EINVAL;
4756 goto err_free;
4757 }
4758 memcpy(assoc_data->fils_kek, req->fils_kek,
4759 req->fils_kek_len);
4760 assoc_data->fils_kek_len = req->fils_kek_len;
4761 }
4762
4763 if (req->fils_nonces)
4764 memcpy(assoc_data->fils_nonces, req->fils_nonces,
4765 2 * FILS_NONCE_LEN);
4766
4767 assoc_data->bss = req->bss;
4768
4769 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4770 if (ifmgd->powersave)
4771 sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4772 else
4773 sdata->smps_mode = IEEE80211_SMPS_OFF;
4774 } else
4775 sdata->smps_mode = ifmgd->req_smps;
4776
4777 assoc_data->capability = req->bss->capability;
4778 assoc_data->supp_rates = bss->supp_rates;
4779 assoc_data->supp_rates_len = bss->supp_rates_len;
4780
4781 rcu_read_lock();
4782 ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4783 if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4784 assoc_data->ap_ht_param =
4785 ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4786 else
4787 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4788 vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4789 if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4790 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4791 sizeof(struct ieee80211_vht_cap));
4792 else
4793 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4794 rcu_read_unlock();
4795
4796 if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) &&
4797 ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK),
4798 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"))
4799 sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;
4800
4801 if (bss->wmm_used && bss->uapsd_supported &&
4802 (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) {
4803 assoc_data->uapsd = true;
4804 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4805 } else {
4806 assoc_data->uapsd = false;
4807 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4808 }
4809
4810 if (req->prev_bssid)
4811 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4812
4813 if (req->use_mfp) {
4814 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4815 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4816 } else {
4817 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4818 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4819 }
4820
4821 if (req->flags & ASSOC_REQ_USE_RRM)
4822 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
4823 else
4824 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;
4825
4826 if (req->crypto.control_port)
4827 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4828 else
4829 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4830
4831 sdata->control_port_protocol = req->crypto.control_port_ethertype;
4832 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4833 sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4834 sdata->vif.type);
4835
4836 /* kick off associate process */
4837
4838 ifmgd->assoc_data = assoc_data;
4839 ifmgd->dtim_period = 0;
4840 ifmgd->have_beacon = false;
4841
4842 /* override HT/VHT configuration only if the AP and we support it */
4843 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
4844 struct ieee80211_sta_ht_cap sta_ht_cap;
4845
4846 if (req->flags & ASSOC_REQ_DISABLE_HT)
4847 override = true;
4848
4849 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
4850 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
4851
4852 /* check for 40 MHz disable override */
4853 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ) &&
4854 sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
4855 !(sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
4856 override = true;
4857
4858 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4859 req->flags & ASSOC_REQ_DISABLE_VHT)
4860 override = true;
4861 }
4862
4863 if (req->flags & ASSOC_REQ_DISABLE_HT) {
4864 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4865 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4866 }
4867
4868 if (req->flags & ASSOC_REQ_DISABLE_VHT)
4869 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4870
4871 err = ieee80211_prep_connection(sdata, req->bss, true, override);
4872 if (err)
4873 goto err_clear;
4874
4875 rcu_read_lock();
4876 beacon_ies = rcu_dereference(req->bss->beacon_ies);
4877
4878 if (ieee80211_hw_check(&sdata->local->hw, NEED_DTIM_BEFORE_ASSOC) &&
4879 !beacon_ies) {
4880 /*
4881 * Wait up to one beacon interval ...
4882 * should this be more if we miss one?
4883 */
4884 sdata_info(sdata, "waiting for beacon from %pM\n",
4885 ifmgd->bssid);
4886 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4887 assoc_data->timeout_started = true;
4888 assoc_data->need_beacon = true;
4889 } else if (beacon_ies) {
4890 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4891 beacon_ies->data,
4892 beacon_ies->len);
4893 u8 dtim_count = 0;
4894
4895 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4896 const struct ieee80211_tim_ie *tim;
4897 tim = (void *)(tim_ie + 2);
4898 ifmgd->dtim_period = tim->dtim_period;
4899 dtim_count = tim->dtim_count;
4900 }
4901 ifmgd->have_beacon = true;
4902 assoc_data->timeout = jiffies;
4903 assoc_data->timeout_started = true;
4904
4905 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
4906 sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4907 sdata->vif.bss_conf.sync_device_ts =
4908 bss->device_ts_beacon;
4909 sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4910 }
4911 } else {
4912 assoc_data->timeout = jiffies;
4913 assoc_data->timeout_started = true;
4914 }
4915 rcu_read_unlock();
4916
4917 run_again(sdata, assoc_data->timeout);
4918
4919 if (bss->corrupt_data) {
4920 char *corrupt_type = "data";
4921 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4922 if (bss->corrupt_data &
4923 IEEE80211_BSS_CORRUPT_PROBE_RESP)
4924 corrupt_type = "beacon and probe response";
4925 else
4926 corrupt_type = "beacon";
4927 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4928 corrupt_type = "probe response";
4929 sdata_info(sdata, "associating with AP with corrupt %s\n",
4930 corrupt_type);
4931 }
4932
4933 return 0;
4934 err_clear:
4935 eth_zero_addr(ifmgd->bssid);
4936 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4937 ifmgd->assoc_data = NULL;
4938 err_free:
4939 kfree(assoc_data);
4940 return err;
4941 }
4942
4943 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4944 struct cfg80211_deauth_request *req)
4945 {
4946 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4947 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4948 bool tx = !req->local_state_change;
4949
4950 if (ifmgd->auth_data &&
4951 ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
4952 sdata_info(sdata,
4953 "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
4954 req->bssid, req->reason_code,
4955 ieee80211_get_reason_code_string(req->reason_code));
4956
4957 drv_mgd_prepare_tx(sdata->local, sdata);
4958 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4959 IEEE80211_STYPE_DEAUTH,
4960 req->reason_code, tx,
4961 frame_buf);
4962 ieee80211_destroy_auth_data(sdata, false);
4963 ieee80211_report_disconnect(sdata, frame_buf,
4964 sizeof(frame_buf), true,
4965 req->reason_code);
4966
4967 return 0;
4968 }
4969
4970 if (ifmgd->assoc_data &&
4971 ether_addr_equal(ifmgd->assoc_data->bss->bssid, req->bssid)) {
4972 sdata_info(sdata,
4973 "aborting association with %pM by local choice (Reason: %u=%s)\n",
4974 req->bssid, req->reason_code,
4975 ieee80211_get_reason_code_string(req->reason_code));
4976
4977 drv_mgd_prepare_tx(sdata->local, sdata);
4978 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4979 IEEE80211_STYPE_DEAUTH,
4980 req->reason_code, tx,
4981 frame_buf);
4982 ieee80211_destroy_assoc_data(sdata, false, true);
4983 ieee80211_report_disconnect(sdata, frame_buf,
4984 sizeof(frame_buf), true,
4985 req->reason_code);
4986 return 0;
4987 }
4988
4989 if (ifmgd->associated &&
4990 ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4991 sdata_info(sdata,
4992 "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
4993 req->bssid, req->reason_code,
4994 ieee80211_get_reason_code_string(req->reason_code));
4995
4996 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4997 req->reason_code, tx, frame_buf);
4998 ieee80211_report_disconnect(sdata, frame_buf,
4999 sizeof(frame_buf), true,
5000 req->reason_code);
5001 return 0;
5002 }
5003
5004 return -ENOTCONN;
5005 }
5006
5007 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
5008 struct cfg80211_disassoc_request *req)
5009 {
5010 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5011 u8 bssid[ETH_ALEN];
5012 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
5013
5014 /*
5015 * cfg80211 should catch this ... but it's racy since
5016 * we can receive a disassoc frame, process it, hand it
5017 * to cfg80211 while that's in a locked section already
5018 * trying to tell us that the user wants to disconnect.
5019 */
5020 if (ifmgd->associated != req->bss)
5021 return -ENOLINK;
5022
5023 sdata_info(sdata,
5024 "disassociating from %pM by local choice (Reason: %u=%s)\n",
5025 req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
5026
5027 memcpy(bssid, req->bss->bssid, ETH_ALEN);
5028 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
5029 req->reason_code, !req->local_state_change,
5030 frame_buf);
5031
5032 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
5033 req->reason_code);
5034
5035 return 0;
5036 }
5037
5038 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
5039 {
5040 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5041
5042 /*
5043 * Make sure some work items will not run after this,
5044 * they will not do anything but might not have been
5045 * cancelled when disconnecting.
5046 */
5047 cancel_work_sync(&ifmgd->monitor_work);
5048 cancel_work_sync(&ifmgd->beacon_connection_loss_work);
5049 cancel_work_sync(&ifmgd->request_smps_work);
5050 cancel_work_sync(&ifmgd->csa_connection_drop_work);
5051 cancel_work_sync(&ifmgd->chswitch_work);
5052 cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
5053
5054 sdata_lock(sdata);
5055 if (ifmgd->assoc_data) {
5056 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
5057 ieee80211_destroy_assoc_data(sdata, false, false);
5058 cfg80211_assoc_timeout(sdata->dev, bss);
5059 }
5060 if (ifmgd->auth_data)
5061 ieee80211_destroy_auth_data(sdata, false);
5062 spin_lock_bh(&ifmgd->teardown_lock);
5063 if (ifmgd->teardown_skb) {
5064 kfree_skb(ifmgd->teardown_skb);
5065 ifmgd->teardown_skb = NULL;
5066 ifmgd->orig_teardown_skb = NULL;
5067 }
5068 spin_unlock_bh(&ifmgd->teardown_lock);
5069 del_timer_sync(&ifmgd->timer);
5070 sdata_unlock(sdata);
5071 }
5072
5073 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
5074 enum nl80211_cqm_rssi_threshold_event rssi_event,
5075 s32 rssi_level,
5076 gfp_t gfp)
5077 {
5078 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5079
5080 trace_api_cqm_rssi_notify(sdata, rssi_event, rssi_level);
5081
5082 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, rssi_level, gfp);
5083 }
5084 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
5085
5086 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp)
5087 {
5088 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5089
5090 trace_api_cqm_beacon_loss_notify(sdata->local, sdata);
5091
5092 cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp);
5093 }
5094 EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify);
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