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[mirror_ubuntu-eoan-kernel.git] / net / mac80211 / mlme.c
1 /*
2 * BSS client mode implementation
3 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4 * Copyright 2004, Instant802 Networks, Inc.
5 * Copyright 2005, Devicescape Software, Inc.
6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8 * Copyright 2013-2014 Intel Mobile Communications GmbH
9 * Copyright (C) 2015 - 2017 Intel Deutschland GmbH
10 * Copyright (C) 2018 Intel Corporation
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
15 */
16
17 #include <linux/delay.h>
18 #include <linux/if_ether.h>
19 #include <linux/skbuff.h>
20 #include <linux/if_arp.h>
21 #include <linux/etherdevice.h>
22 #include <linux/moduleparam.h>
23 #include <linux/rtnetlink.h>
24 #include <linux/crc32.h>
25 #include <linux/slab.h>
26 #include <linux/export.h>
27 #include <net/mac80211.h>
28 #include <asm/unaligned.h>
29
30 #include "ieee80211_i.h"
31 #include "driver-ops.h"
32 #include "rate.h"
33 #include "led.h"
34 #include "fils_aead.h"
35
36 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
37 #define IEEE80211_AUTH_TIMEOUT_LONG (HZ / 2)
38 #define IEEE80211_AUTH_TIMEOUT_SHORT (HZ / 10)
39 #define IEEE80211_AUTH_MAX_TRIES 3
40 #define IEEE80211_AUTH_WAIT_ASSOC (HZ * 5)
41 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
42 #define IEEE80211_ASSOC_TIMEOUT_LONG (HZ / 2)
43 #define IEEE80211_ASSOC_TIMEOUT_SHORT (HZ / 10)
44 #define IEEE80211_ASSOC_MAX_TRIES 3
45
46 static int max_nullfunc_tries = 2;
47 module_param(max_nullfunc_tries, int, 0644);
48 MODULE_PARM_DESC(max_nullfunc_tries,
49 "Maximum nullfunc tx tries before disconnecting (reason 4).");
50
51 static int max_probe_tries = 5;
52 module_param(max_probe_tries, int, 0644);
53 MODULE_PARM_DESC(max_probe_tries,
54 "Maximum probe tries before disconnecting (reason 4).");
55
56 /*
57 * Beacon loss timeout is calculated as N frames times the
58 * advertised beacon interval. This may need to be somewhat
59 * higher than what hardware might detect to account for
60 * delays in the host processing frames. But since we also
61 * probe on beacon miss before declaring the connection lost
62 * default to what we want.
63 */
64 static int beacon_loss_count = 7;
65 module_param(beacon_loss_count, int, 0644);
66 MODULE_PARM_DESC(beacon_loss_count,
67 "Number of beacon intervals before we decide beacon was lost.");
68
69 /*
70 * Time the connection can be idle before we probe
71 * it to see if we can still talk to the AP.
72 */
73 #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ)
74 /*
75 * Time we wait for a probe response after sending
76 * a probe request because of beacon loss or for
77 * checking the connection still works.
78 */
79 static int probe_wait_ms = 500;
80 module_param(probe_wait_ms, int, 0644);
81 MODULE_PARM_DESC(probe_wait_ms,
82 "Maximum time(ms) to wait for probe response"
83 " before disconnecting (reason 4).");
84
85 /*
86 * How many Beacon frames need to have been used in average signal strength
87 * before starting to indicate signal change events.
88 */
89 #define IEEE80211_SIGNAL_AVE_MIN_COUNT 4
90
91 /*
92 * We can have multiple work items (and connection probing)
93 * scheduling this timer, but we need to take care to only
94 * reschedule it when it should fire _earlier_ than it was
95 * asked for before, or if it's not pending right now. This
96 * function ensures that. Note that it then is required to
97 * run this function for all timeouts after the first one
98 * has happened -- the work that runs from this timer will
99 * do that.
100 */
101 static void run_again(struct ieee80211_sub_if_data *sdata,
102 unsigned long timeout)
103 {
104 sdata_assert_lock(sdata);
105
106 if (!timer_pending(&sdata->u.mgd.timer) ||
107 time_before(timeout, sdata->u.mgd.timer.expires))
108 mod_timer(&sdata->u.mgd.timer, timeout);
109 }
110
111 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
112 {
113 if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
114 return;
115
116 if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
117 return;
118
119 mod_timer(&sdata->u.mgd.bcn_mon_timer,
120 round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
121 }
122
123 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
124 {
125 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
126
127 if (unlikely(!ifmgd->associated))
128 return;
129
130 if (ifmgd->probe_send_count)
131 ifmgd->probe_send_count = 0;
132
133 if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
134 return;
135
136 mod_timer(&ifmgd->conn_mon_timer,
137 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
138 }
139
140 static int ecw2cw(int ecw)
141 {
142 return (1 << ecw) - 1;
143 }
144
145 static u32
146 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
147 struct ieee80211_supported_band *sband,
148 struct ieee80211_channel *channel,
149 const struct ieee80211_ht_operation *ht_oper,
150 const struct ieee80211_vht_operation *vht_oper,
151 struct cfg80211_chan_def *chandef, bool tracking)
152 {
153 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
154 struct cfg80211_chan_def vht_chandef;
155 struct ieee80211_sta_ht_cap sta_ht_cap;
156 u32 ht_cfreq, ret;
157
158 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
159 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
160
161 chandef->chan = channel;
162 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
163 chandef->center_freq1 = channel->center_freq;
164 chandef->center_freq2 = 0;
165
166 if (!ht_oper || !sta_ht_cap.ht_supported) {
167 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
168 goto out;
169 }
170
171 chandef->width = NL80211_CHAN_WIDTH_20;
172
173 ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
174 channel->band);
175 /* check that channel matches the right operating channel */
176 if (!tracking && channel->center_freq != ht_cfreq) {
177 /*
178 * It's possible that some APs are confused here;
179 * Netgear WNDR3700 sometimes reports 4 higher than
180 * the actual channel in association responses, but
181 * since we look at probe response/beacon data here
182 * it should be OK.
183 */
184 sdata_info(sdata,
185 "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
186 channel->center_freq, ht_cfreq,
187 ht_oper->primary_chan, channel->band);
188 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
189 goto out;
190 }
191
192 /* check 40 MHz support, if we have it */
193 if (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
194 ieee80211_chandef_ht_oper(ht_oper, chandef);
195 } else {
196 /* 40 MHz (and 80 MHz) must be supported for VHT */
197 ret = IEEE80211_STA_DISABLE_VHT;
198 /* also mark 40 MHz disabled */
199 ret |= IEEE80211_STA_DISABLE_40MHZ;
200 goto out;
201 }
202
203 if (!vht_oper || !sband->vht_cap.vht_supported) {
204 ret = IEEE80211_STA_DISABLE_VHT;
205 goto out;
206 }
207
208 vht_chandef = *chandef;
209 if (!ieee80211_chandef_vht_oper(vht_oper, &vht_chandef)) {
210 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
211 sdata_info(sdata,
212 "AP VHT information is invalid, disable VHT\n");
213 ret = IEEE80211_STA_DISABLE_VHT;
214 goto out;
215 }
216
217 if (!cfg80211_chandef_valid(&vht_chandef)) {
218 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
219 sdata_info(sdata,
220 "AP VHT information is invalid, disable VHT\n");
221 ret = IEEE80211_STA_DISABLE_VHT;
222 goto out;
223 }
224
225 if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
226 ret = 0;
227 goto out;
228 }
229
230 if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
231 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
232 sdata_info(sdata,
233 "AP VHT information doesn't match HT, disable VHT\n");
234 ret = IEEE80211_STA_DISABLE_VHT;
235 goto out;
236 }
237
238 *chandef = vht_chandef;
239
240 ret = 0;
241
242 out:
243 /*
244 * When tracking the current AP, don't do any further checks if the
245 * new chandef is identical to the one we're currently using for the
246 * connection. This keeps us from playing ping-pong with regulatory,
247 * without it the following can happen (for example):
248 * - connect to an AP with 80 MHz, world regdom allows 80 MHz
249 * - AP advertises regdom US
250 * - CRDA loads regdom US with 80 MHz prohibited (old database)
251 * - the code below detects an unsupported channel, downgrades, and
252 * we disconnect from the AP in the caller
253 * - disconnect causes CRDA to reload world regdomain and the game
254 * starts anew.
255 * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
256 *
257 * It seems possible that there are still scenarios with CSA or real
258 * bandwidth changes where a this could happen, but those cases are
259 * less common and wouldn't completely prevent using the AP.
260 */
261 if (tracking &&
262 cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
263 return ret;
264
265 /* don't print the message below for VHT mismatch if VHT is disabled */
266 if (ret & IEEE80211_STA_DISABLE_VHT)
267 vht_chandef = *chandef;
268
269 /*
270 * Ignore the DISABLED flag when we're already connected and only
271 * tracking the APs beacon for bandwidth changes - otherwise we
272 * might get disconnected here if we connect to an AP, update our
273 * regulatory information based on the AP's country IE and the
274 * information we have is wrong/outdated and disables the channel
275 * that we're actually using for the connection to the AP.
276 */
277 while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
278 tracking ? 0 :
279 IEEE80211_CHAN_DISABLED)) {
280 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
281 ret = IEEE80211_STA_DISABLE_HT |
282 IEEE80211_STA_DISABLE_VHT;
283 break;
284 }
285
286 ret |= ieee80211_chandef_downgrade(chandef);
287 }
288
289 if (chandef->width != vht_chandef.width && !tracking)
290 sdata_info(sdata,
291 "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
292
293 WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
294 return ret;
295 }
296
297 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
298 struct sta_info *sta,
299 const struct ieee80211_ht_cap *ht_cap,
300 const struct ieee80211_ht_operation *ht_oper,
301 const struct ieee80211_vht_operation *vht_oper,
302 const u8 *bssid, u32 *changed)
303 {
304 struct ieee80211_local *local = sdata->local;
305 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
306 struct ieee80211_supported_band *sband;
307 struct ieee80211_channel *chan;
308 struct cfg80211_chan_def chandef;
309 u16 ht_opmode;
310 u32 flags;
311 enum ieee80211_sta_rx_bandwidth new_sta_bw;
312 int ret;
313
314 /* if HT was/is disabled, don't track any bandwidth changes */
315 if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
316 return 0;
317
318 /* don't check VHT if we associated as non-VHT station */
319 if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
320 vht_oper = NULL;
321
322 if (WARN_ON_ONCE(!sta))
323 return -EINVAL;
324
325 /*
326 * if bss configuration changed store the new one -
327 * this may be applicable even if channel is identical
328 */
329 ht_opmode = le16_to_cpu(ht_oper->operation_mode);
330 if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
331 *changed |= BSS_CHANGED_HT;
332 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
333 }
334
335 chan = sdata->vif.bss_conf.chandef.chan;
336 sband = local->hw.wiphy->bands[chan->band];
337
338 /* calculate new channel (type) based on HT/VHT operation IEs */
339 flags = ieee80211_determine_chantype(sdata, sband, chan,
340 ht_oper, vht_oper,
341 &chandef, true);
342
343 /*
344 * Downgrade the new channel if we associated with restricted
345 * capabilities. For example, if we associated as a 20 MHz STA
346 * to a 40 MHz AP (due to regulatory, capabilities or config
347 * reasons) then switching to a 40 MHz channel now won't do us
348 * any good -- we couldn't use it with the AP.
349 */
350 if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
351 chandef.width == NL80211_CHAN_WIDTH_80P80)
352 flags |= ieee80211_chandef_downgrade(&chandef);
353 if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
354 chandef.width == NL80211_CHAN_WIDTH_160)
355 flags |= ieee80211_chandef_downgrade(&chandef);
356 if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
357 chandef.width > NL80211_CHAN_WIDTH_20)
358 flags |= ieee80211_chandef_downgrade(&chandef);
359
360 if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
361 return 0;
362
363 sdata_info(sdata,
364 "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
365 ifmgd->bssid, chandef.chan->center_freq, chandef.width,
366 chandef.center_freq1, chandef.center_freq2);
367
368 if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
369 IEEE80211_STA_DISABLE_VHT |
370 IEEE80211_STA_DISABLE_40MHZ |
371 IEEE80211_STA_DISABLE_80P80MHZ |
372 IEEE80211_STA_DISABLE_160MHZ)) ||
373 !cfg80211_chandef_valid(&chandef)) {
374 sdata_info(sdata,
375 "AP %pM changed bandwidth in a way we can't support - disconnect\n",
376 ifmgd->bssid);
377 return -EINVAL;
378 }
379
380 switch (chandef.width) {
381 case NL80211_CHAN_WIDTH_20_NOHT:
382 case NL80211_CHAN_WIDTH_20:
383 new_sta_bw = IEEE80211_STA_RX_BW_20;
384 break;
385 case NL80211_CHAN_WIDTH_40:
386 new_sta_bw = IEEE80211_STA_RX_BW_40;
387 break;
388 case NL80211_CHAN_WIDTH_80:
389 new_sta_bw = IEEE80211_STA_RX_BW_80;
390 break;
391 case NL80211_CHAN_WIDTH_80P80:
392 case NL80211_CHAN_WIDTH_160:
393 new_sta_bw = IEEE80211_STA_RX_BW_160;
394 break;
395 default:
396 return -EINVAL;
397 }
398
399 if (new_sta_bw > sta->cur_max_bandwidth)
400 new_sta_bw = sta->cur_max_bandwidth;
401
402 if (new_sta_bw < sta->sta.bandwidth) {
403 sta->sta.bandwidth = new_sta_bw;
404 rate_control_rate_update(local, sband, sta,
405 IEEE80211_RC_BW_CHANGED);
406 }
407
408 ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
409 if (ret) {
410 sdata_info(sdata,
411 "AP %pM changed bandwidth to incompatible one - disconnect\n",
412 ifmgd->bssid);
413 return ret;
414 }
415
416 if (new_sta_bw > sta->sta.bandwidth) {
417 sta->sta.bandwidth = new_sta_bw;
418 rate_control_rate_update(local, sband, sta,
419 IEEE80211_RC_BW_CHANGED);
420 }
421
422 return 0;
423 }
424
425 /* frame sending functions */
426
427 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
428 struct sk_buff *skb, u8 ap_ht_param,
429 struct ieee80211_supported_band *sband,
430 struct ieee80211_channel *channel,
431 enum ieee80211_smps_mode smps)
432 {
433 u8 *pos;
434 u32 flags = channel->flags;
435 u16 cap;
436 struct ieee80211_sta_ht_cap ht_cap;
437
438 BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
439
440 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
441 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
442
443 /* determine capability flags */
444 cap = ht_cap.cap;
445
446 switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
447 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
448 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
449 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
450 cap &= ~IEEE80211_HT_CAP_SGI_40;
451 }
452 break;
453 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
454 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
455 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
456 cap &= ~IEEE80211_HT_CAP_SGI_40;
457 }
458 break;
459 }
460
461 /*
462 * If 40 MHz was disabled associate as though we weren't
463 * capable of 40 MHz -- some broken APs will never fall
464 * back to trying to transmit in 20 MHz.
465 */
466 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
467 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
468 cap &= ~IEEE80211_HT_CAP_SGI_40;
469 }
470
471 /* set SM PS mode properly */
472 cap &= ~IEEE80211_HT_CAP_SM_PS;
473 switch (smps) {
474 case IEEE80211_SMPS_AUTOMATIC:
475 case IEEE80211_SMPS_NUM_MODES:
476 WARN_ON(1);
477 /* fall through */
478 case IEEE80211_SMPS_OFF:
479 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
480 IEEE80211_HT_CAP_SM_PS_SHIFT;
481 break;
482 case IEEE80211_SMPS_STATIC:
483 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
484 IEEE80211_HT_CAP_SM_PS_SHIFT;
485 break;
486 case IEEE80211_SMPS_DYNAMIC:
487 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
488 IEEE80211_HT_CAP_SM_PS_SHIFT;
489 break;
490 }
491
492 /* reserve and fill IE */
493 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
494 ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
495 }
496
497 /* This function determines vht capability flags for the association
498 * and builds the IE.
499 * Note - the function may set the owner of the MU-MIMO capability
500 */
501 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
502 struct sk_buff *skb,
503 struct ieee80211_supported_band *sband,
504 struct ieee80211_vht_cap *ap_vht_cap)
505 {
506 struct ieee80211_local *local = sdata->local;
507 u8 *pos;
508 u32 cap;
509 struct ieee80211_sta_vht_cap vht_cap;
510 u32 mask, ap_bf_sts, our_bf_sts;
511
512 BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
513
514 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
515 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
516
517 /* determine capability flags */
518 cap = vht_cap.cap;
519
520 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
521 u32 bw = cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
522
523 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
524 if (bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ ||
525 bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
526 cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
527 }
528
529 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
530 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
531 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
532 }
533
534 /*
535 * Some APs apparently get confused if our capabilities are better
536 * than theirs, so restrict what we advertise in the assoc request.
537 */
538 if (!(ap_vht_cap->vht_cap_info &
539 cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
540 cap &= ~(IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
541 IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE);
542 else if (!(ap_vht_cap->vht_cap_info &
543 cpu_to_le32(IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE)))
544 cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
545
546 /*
547 * If some other vif is using the MU-MIMO capablity we cannot associate
548 * using MU-MIMO - this will lead to contradictions in the group-id
549 * mechanism.
550 * Ownership is defined since association request, in order to avoid
551 * simultaneous associations with MU-MIMO.
552 */
553 if (cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE) {
554 bool disable_mu_mimo = false;
555 struct ieee80211_sub_if_data *other;
556
557 list_for_each_entry_rcu(other, &local->interfaces, list) {
558 if (other->vif.mu_mimo_owner) {
559 disable_mu_mimo = true;
560 break;
561 }
562 }
563 if (disable_mu_mimo)
564 cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
565 else
566 sdata->vif.mu_mimo_owner = true;
567 }
568
569 mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
570
571 ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask;
572 our_bf_sts = cap & mask;
573
574 if (ap_bf_sts < our_bf_sts) {
575 cap &= ~mask;
576 cap |= ap_bf_sts;
577 }
578
579 /* reserve and fill IE */
580 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
581 ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
582 }
583
584 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
585 {
586 struct ieee80211_local *local = sdata->local;
587 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
588 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
589 struct sk_buff *skb;
590 struct ieee80211_mgmt *mgmt;
591 u8 *pos, qos_info;
592 size_t offset = 0, noffset;
593 int i, count, rates_len, supp_rates_len, shift;
594 u16 capab;
595 struct ieee80211_supported_band *sband;
596 struct ieee80211_chanctx_conf *chanctx_conf;
597 struct ieee80211_channel *chan;
598 u32 rates = 0;
599
600 sdata_assert_lock(sdata);
601
602 rcu_read_lock();
603 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
604 if (WARN_ON(!chanctx_conf)) {
605 rcu_read_unlock();
606 return;
607 }
608 chan = chanctx_conf->def.chan;
609 rcu_read_unlock();
610 sband = local->hw.wiphy->bands[chan->band];
611 shift = ieee80211_vif_get_shift(&sdata->vif);
612
613 if (assoc_data->supp_rates_len) {
614 /*
615 * Get all rates supported by the device and the AP as
616 * some APs don't like getting a superset of their rates
617 * in the association request (e.g. D-Link DAP 1353 in
618 * b-only mode)...
619 */
620 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
621 assoc_data->supp_rates,
622 assoc_data->supp_rates_len,
623 &rates);
624 } else {
625 /*
626 * In case AP not provide any supported rates information
627 * before association, we send information element(s) with
628 * all rates that we support.
629 */
630 rates_len = 0;
631 for (i = 0; i < sband->n_bitrates; i++) {
632 rates |= BIT(i);
633 rates_len++;
634 }
635 }
636
637 skb = alloc_skb(local->hw.extra_tx_headroom +
638 sizeof(*mgmt) + /* bit too much but doesn't matter */
639 2 + assoc_data->ssid_len + /* SSID */
640 4 + rates_len + /* (extended) rates */
641 4 + /* power capability */
642 2 + 2 * sband->n_channels + /* supported channels */
643 2 + sizeof(struct ieee80211_ht_cap) + /* HT */
644 2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
645 assoc_data->ie_len + /* extra IEs */
646 (assoc_data->fils_kek_len ? 16 /* AES-SIV */ : 0) +
647 9, /* WMM */
648 GFP_KERNEL);
649 if (!skb)
650 return;
651
652 skb_reserve(skb, local->hw.extra_tx_headroom);
653
654 capab = WLAN_CAPABILITY_ESS;
655
656 if (sband->band == NL80211_BAND_2GHZ) {
657 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
658 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
659 }
660
661 if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
662 capab |= WLAN_CAPABILITY_PRIVACY;
663
664 if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
665 ieee80211_hw_check(&local->hw, SPECTRUM_MGMT))
666 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
667
668 if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM)
669 capab |= WLAN_CAPABILITY_RADIO_MEASURE;
670
671 mgmt = skb_put_zero(skb, 24);
672 memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
673 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
674 memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
675
676 if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
677 skb_put(skb, 10);
678 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
679 IEEE80211_STYPE_REASSOC_REQ);
680 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
681 mgmt->u.reassoc_req.listen_interval =
682 cpu_to_le16(local->hw.conf.listen_interval);
683 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
684 ETH_ALEN);
685 } else {
686 skb_put(skb, 4);
687 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
688 IEEE80211_STYPE_ASSOC_REQ);
689 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
690 mgmt->u.assoc_req.listen_interval =
691 cpu_to_le16(local->hw.conf.listen_interval);
692 }
693
694 /* SSID */
695 pos = skb_put(skb, 2 + assoc_data->ssid_len);
696 *pos++ = WLAN_EID_SSID;
697 *pos++ = assoc_data->ssid_len;
698 memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
699
700 /* add all rates which were marked to be used above */
701 supp_rates_len = rates_len;
702 if (supp_rates_len > 8)
703 supp_rates_len = 8;
704
705 pos = skb_put(skb, supp_rates_len + 2);
706 *pos++ = WLAN_EID_SUPP_RATES;
707 *pos++ = supp_rates_len;
708
709 count = 0;
710 for (i = 0; i < sband->n_bitrates; i++) {
711 if (BIT(i) & rates) {
712 int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
713 5 * (1 << shift));
714 *pos++ = (u8) rate;
715 if (++count == 8)
716 break;
717 }
718 }
719
720 if (rates_len > count) {
721 pos = skb_put(skb, rates_len - count + 2);
722 *pos++ = WLAN_EID_EXT_SUPP_RATES;
723 *pos++ = rates_len - count;
724
725 for (i++; i < sband->n_bitrates; i++) {
726 if (BIT(i) & rates) {
727 int rate;
728 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
729 5 * (1 << shift));
730 *pos++ = (u8) rate;
731 }
732 }
733 }
734
735 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT ||
736 capab & WLAN_CAPABILITY_RADIO_MEASURE) {
737 pos = skb_put(skb, 4);
738 *pos++ = WLAN_EID_PWR_CAPABILITY;
739 *pos++ = 2;
740 *pos++ = 0; /* min tx power */
741 /* max tx power */
742 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
743 }
744
745 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
746 /* TODO: get this in reg domain format */
747 pos = skb_put(skb, 2 * sband->n_channels + 2);
748 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
749 *pos++ = 2 * sband->n_channels;
750 for (i = 0; i < sband->n_channels; i++) {
751 *pos++ = ieee80211_frequency_to_channel(
752 sband->channels[i].center_freq);
753 *pos++ = 1; /* one channel in the subband*/
754 }
755 }
756
757 /* if present, add any custom IEs that go before HT */
758 if (assoc_data->ie_len) {
759 static const u8 before_ht[] = {
760 WLAN_EID_SSID,
761 WLAN_EID_SUPP_RATES,
762 WLAN_EID_EXT_SUPP_RATES,
763 WLAN_EID_PWR_CAPABILITY,
764 WLAN_EID_SUPPORTED_CHANNELS,
765 WLAN_EID_RSN,
766 WLAN_EID_QOS_CAPA,
767 WLAN_EID_RRM_ENABLED_CAPABILITIES,
768 WLAN_EID_MOBILITY_DOMAIN,
769 WLAN_EID_FAST_BSS_TRANSITION, /* reassoc only */
770 WLAN_EID_RIC_DATA, /* reassoc only */
771 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
772 };
773 static const u8 after_ric[] = {
774 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
775 WLAN_EID_HT_CAPABILITY,
776 WLAN_EID_BSS_COEX_2040,
777 /* luckily this is almost always there */
778 WLAN_EID_EXT_CAPABILITY,
779 WLAN_EID_QOS_TRAFFIC_CAPA,
780 WLAN_EID_TIM_BCAST_REQ,
781 WLAN_EID_INTERWORKING,
782 /* 60 GHz (Multi-band, DMG, MMS) can't happen */
783 WLAN_EID_VHT_CAPABILITY,
784 WLAN_EID_OPMODE_NOTIF,
785 };
786
787 noffset = ieee80211_ie_split_ric(assoc_data->ie,
788 assoc_data->ie_len,
789 before_ht,
790 ARRAY_SIZE(before_ht),
791 after_ric,
792 ARRAY_SIZE(after_ric),
793 offset);
794 skb_put_data(skb, assoc_data->ie + offset, noffset - offset);
795 offset = noffset;
796 }
797
798 if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
799 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
800 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
801
802 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
803 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
804 sband, chan, sdata->smps_mode);
805
806 /* if present, add any custom IEs that go before VHT */
807 if (assoc_data->ie_len) {
808 static const u8 before_vht[] = {
809 /*
810 * no need to list the ones split off before HT
811 * or generated here
812 */
813 WLAN_EID_BSS_COEX_2040,
814 WLAN_EID_EXT_CAPABILITY,
815 WLAN_EID_QOS_TRAFFIC_CAPA,
816 WLAN_EID_TIM_BCAST_REQ,
817 WLAN_EID_INTERWORKING,
818 /* 60 GHz (Multi-band, DMG, MMS) can't happen */
819 };
820
821 /* RIC already taken above, so no need to handle here anymore */
822 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
823 before_vht, ARRAY_SIZE(before_vht),
824 offset);
825 skb_put_data(skb, assoc_data->ie + offset, noffset - offset);
826 offset = noffset;
827 }
828
829 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
830 ieee80211_add_vht_ie(sdata, skb, sband,
831 &assoc_data->ap_vht_cap);
832
833 /* if present, add any custom non-vendor IEs that go after HT */
834 if (assoc_data->ie_len) {
835 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
836 assoc_data->ie_len,
837 offset);
838 skb_put_data(skb, assoc_data->ie + offset, noffset - offset);
839 offset = noffset;
840 }
841
842 if (assoc_data->wmm) {
843 if (assoc_data->uapsd) {
844 qos_info = ifmgd->uapsd_queues;
845 qos_info |= (ifmgd->uapsd_max_sp_len <<
846 IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
847 } else {
848 qos_info = 0;
849 }
850
851 pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
852 }
853
854 /* add any remaining custom (i.e. vendor specific here) IEs */
855 if (assoc_data->ie_len) {
856 noffset = assoc_data->ie_len;
857 skb_put_data(skb, assoc_data->ie + offset, noffset - offset);
858 }
859
860 if (assoc_data->fils_kek_len &&
861 fils_encrypt_assoc_req(skb, assoc_data) < 0) {
862 dev_kfree_skb(skb);
863 return;
864 }
865
866 drv_mgd_prepare_tx(local, sdata);
867
868 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
869 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
870 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
871 IEEE80211_TX_INTFL_MLME_CONN_TX;
872 ieee80211_tx_skb(sdata, skb);
873 }
874
875 void ieee80211_send_pspoll(struct ieee80211_local *local,
876 struct ieee80211_sub_if_data *sdata)
877 {
878 struct ieee80211_pspoll *pspoll;
879 struct sk_buff *skb;
880
881 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
882 if (!skb)
883 return;
884
885 pspoll = (struct ieee80211_pspoll *) skb->data;
886 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
887
888 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
889 ieee80211_tx_skb(sdata, skb);
890 }
891
892 void ieee80211_send_nullfunc(struct ieee80211_local *local,
893 struct ieee80211_sub_if_data *sdata,
894 bool powersave)
895 {
896 struct sk_buff *skb;
897 struct ieee80211_hdr_3addr *nullfunc;
898 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
899
900 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif,
901 !ieee80211_hw_check(&local->hw, DOESNT_SUPPORT_QOS_NDP));
902 if (!skb)
903 return;
904
905 nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
906 if (powersave)
907 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
908
909 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
910 IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
911
912 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
913 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
914
915 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
916 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
917
918 ieee80211_tx_skb(sdata, skb);
919 }
920
921 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
922 struct ieee80211_sub_if_data *sdata)
923 {
924 struct sk_buff *skb;
925 struct ieee80211_hdr *nullfunc;
926 __le16 fc;
927
928 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
929 return;
930
931 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
932 if (!skb)
933 return;
934
935 skb_reserve(skb, local->hw.extra_tx_headroom);
936
937 nullfunc = skb_put_zero(skb, 30);
938 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
939 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
940 nullfunc->frame_control = fc;
941 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
942 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
943 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
944 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
945
946 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
947 ieee80211_tx_skb(sdata, skb);
948 }
949
950 /* spectrum management related things */
951 static void ieee80211_chswitch_work(struct work_struct *work)
952 {
953 struct ieee80211_sub_if_data *sdata =
954 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
955 struct ieee80211_local *local = sdata->local;
956 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
957 int ret;
958
959 if (!ieee80211_sdata_running(sdata))
960 return;
961
962 sdata_lock(sdata);
963 mutex_lock(&local->mtx);
964 mutex_lock(&local->chanctx_mtx);
965
966 if (!ifmgd->associated)
967 goto out;
968
969 if (!sdata->vif.csa_active)
970 goto out;
971
972 /*
973 * using reservation isn't immediate as it may be deferred until later
974 * with multi-vif. once reservation is complete it will re-schedule the
975 * work with no reserved_chanctx so verify chandef to check if it
976 * completed successfully
977 */
978
979 if (sdata->reserved_chanctx) {
980 /*
981 * with multi-vif csa driver may call ieee80211_csa_finish()
982 * many times while waiting for other interfaces to use their
983 * reservations
984 */
985 if (sdata->reserved_ready)
986 goto out;
987
988 ret = ieee80211_vif_use_reserved_context(sdata);
989 if (ret) {
990 sdata_info(sdata,
991 "failed to use reserved channel context, disconnecting (err=%d)\n",
992 ret);
993 ieee80211_queue_work(&sdata->local->hw,
994 &ifmgd->csa_connection_drop_work);
995 goto out;
996 }
997
998 goto out;
999 }
1000
1001 if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
1002 &sdata->csa_chandef)) {
1003 sdata_info(sdata,
1004 "failed to finalize channel switch, disconnecting\n");
1005 ieee80211_queue_work(&sdata->local->hw,
1006 &ifmgd->csa_connection_drop_work);
1007 goto out;
1008 }
1009
1010 /* XXX: shouldn't really modify cfg80211-owned data! */
1011 ifmgd->associated->channel = sdata->csa_chandef.chan;
1012
1013 ifmgd->csa_waiting_bcn = true;
1014
1015 ieee80211_sta_reset_beacon_monitor(sdata);
1016 ieee80211_sta_reset_conn_monitor(sdata);
1017
1018 out:
1019 mutex_unlock(&local->chanctx_mtx);
1020 mutex_unlock(&local->mtx);
1021 sdata_unlock(sdata);
1022 }
1023
1024 static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata)
1025 {
1026 struct ieee80211_local *local = sdata->local;
1027 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1028 int ret;
1029
1030 sdata_assert_lock(sdata);
1031
1032 WARN_ON(!sdata->vif.csa_active);
1033
1034 if (sdata->csa_block_tx) {
1035 ieee80211_wake_vif_queues(local, sdata,
1036 IEEE80211_QUEUE_STOP_REASON_CSA);
1037 sdata->csa_block_tx = false;
1038 }
1039
1040 sdata->vif.csa_active = false;
1041 ifmgd->csa_waiting_bcn = false;
1042
1043 ret = drv_post_channel_switch(sdata);
1044 if (ret) {
1045 sdata_info(sdata,
1046 "driver post channel switch failed, disconnecting\n");
1047 ieee80211_queue_work(&local->hw,
1048 &ifmgd->csa_connection_drop_work);
1049 return;
1050 }
1051
1052 cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef);
1053 }
1054
1055 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
1056 {
1057 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1058 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1059
1060 trace_api_chswitch_done(sdata, success);
1061 if (!success) {
1062 sdata_info(sdata,
1063 "driver channel switch failed, disconnecting\n");
1064 ieee80211_queue_work(&sdata->local->hw,
1065 &ifmgd->csa_connection_drop_work);
1066 } else {
1067 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1068 }
1069 }
1070 EXPORT_SYMBOL(ieee80211_chswitch_done);
1071
1072 static void ieee80211_chswitch_timer(struct timer_list *t)
1073 {
1074 struct ieee80211_sub_if_data *sdata =
1075 from_timer(sdata, t, u.mgd.chswitch_timer);
1076
1077 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1078 }
1079
1080 static void
1081 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1082 u64 timestamp, u32 device_timestamp,
1083 struct ieee802_11_elems *elems,
1084 bool beacon)
1085 {
1086 struct ieee80211_local *local = sdata->local;
1087 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1088 struct cfg80211_bss *cbss = ifmgd->associated;
1089 struct ieee80211_chanctx_conf *conf;
1090 struct ieee80211_chanctx *chanctx;
1091 enum nl80211_band current_band;
1092 struct ieee80211_csa_ie csa_ie;
1093 struct ieee80211_channel_switch ch_switch;
1094 int res;
1095
1096 sdata_assert_lock(sdata);
1097
1098 if (!cbss)
1099 return;
1100
1101 if (local->scanning)
1102 return;
1103
1104 /* disregard subsequent announcements if we are already processing */
1105 if (sdata->vif.csa_active)
1106 return;
1107
1108 current_band = cbss->channel->band;
1109 res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
1110 ifmgd->flags,
1111 ifmgd->associated->bssid, &csa_ie);
1112 if (res < 0)
1113 ieee80211_queue_work(&local->hw,
1114 &ifmgd->csa_connection_drop_work);
1115 if (res)
1116 return;
1117
1118 if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1119 IEEE80211_CHAN_DISABLED)) {
1120 sdata_info(sdata,
1121 "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1122 ifmgd->associated->bssid,
1123 csa_ie.chandef.chan->center_freq,
1124 csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1125 csa_ie.chandef.center_freq2);
1126 ieee80211_queue_work(&local->hw,
1127 &ifmgd->csa_connection_drop_work);
1128 return;
1129 }
1130
1131 if (cfg80211_chandef_identical(&csa_ie.chandef,
1132 &sdata->vif.bss_conf.chandef)) {
1133 if (ifmgd->csa_ignored_same_chan)
1134 return;
1135 sdata_info(sdata,
1136 "AP %pM tries to chanswitch to same channel, ignore\n",
1137 ifmgd->associated->bssid);
1138 ifmgd->csa_ignored_same_chan = true;
1139 return;
1140 }
1141
1142 /*
1143 * Drop all TDLS peers - either we disconnect or move to a different
1144 * channel from this point on. There's no telling what our peer will do.
1145 * The TDLS WIDER_BW scenario is also problematic, as peers might now
1146 * have an incompatible wider chandef.
1147 */
1148 ieee80211_teardown_tdls_peers(sdata);
1149
1150 mutex_lock(&local->mtx);
1151 mutex_lock(&local->chanctx_mtx);
1152 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1153 lockdep_is_held(&local->chanctx_mtx));
1154 if (!conf) {
1155 sdata_info(sdata,
1156 "no channel context assigned to vif?, disconnecting\n");
1157 goto drop_connection;
1158 }
1159
1160 chanctx = container_of(conf, struct ieee80211_chanctx, conf);
1161
1162 if (local->use_chanctx &&
1163 !ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA)) {
1164 sdata_info(sdata,
1165 "driver doesn't support chan-switch with channel contexts\n");
1166 goto drop_connection;
1167 }
1168
1169 ch_switch.timestamp = timestamp;
1170 ch_switch.device_timestamp = device_timestamp;
1171 ch_switch.block_tx = csa_ie.mode;
1172 ch_switch.chandef = csa_ie.chandef;
1173 ch_switch.count = csa_ie.count;
1174
1175 if (drv_pre_channel_switch(sdata, &ch_switch)) {
1176 sdata_info(sdata,
1177 "preparing for channel switch failed, disconnecting\n");
1178 goto drop_connection;
1179 }
1180
1181 res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
1182 chanctx->mode, false);
1183 if (res) {
1184 sdata_info(sdata,
1185 "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
1186 res);
1187 goto drop_connection;
1188 }
1189 mutex_unlock(&local->chanctx_mtx);
1190
1191 sdata->vif.csa_active = true;
1192 sdata->csa_chandef = csa_ie.chandef;
1193 sdata->csa_block_tx = csa_ie.mode;
1194 ifmgd->csa_ignored_same_chan = false;
1195
1196 if (sdata->csa_block_tx)
1197 ieee80211_stop_vif_queues(local, sdata,
1198 IEEE80211_QUEUE_STOP_REASON_CSA);
1199 mutex_unlock(&local->mtx);
1200
1201 cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
1202 csa_ie.count);
1203
1204 if (local->ops->channel_switch) {
1205 /* use driver's channel switch callback */
1206 drv_channel_switch(local, sdata, &ch_switch);
1207 return;
1208 }
1209
1210 /* channel switch handled in software */
1211 if (csa_ie.count <= 1)
1212 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1213 else
1214 mod_timer(&ifmgd->chswitch_timer,
1215 TU_TO_EXP_TIME((csa_ie.count - 1) *
1216 cbss->beacon_interval));
1217 return;
1218 drop_connection:
1219 ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work);
1220 mutex_unlock(&local->chanctx_mtx);
1221 mutex_unlock(&local->mtx);
1222 }
1223
1224 static bool
1225 ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
1226 struct ieee80211_channel *channel,
1227 const u8 *country_ie, u8 country_ie_len,
1228 const u8 *pwr_constr_elem,
1229 int *chan_pwr, int *pwr_reduction)
1230 {
1231 struct ieee80211_country_ie_triplet *triplet;
1232 int chan = ieee80211_frequency_to_channel(channel->center_freq);
1233 int i, chan_increment;
1234 bool have_chan_pwr = false;
1235
1236 /* Invalid IE */
1237 if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1238 return false;
1239
1240 triplet = (void *)(country_ie + 3);
1241 country_ie_len -= 3;
1242
1243 switch (channel->band) {
1244 default:
1245 WARN_ON_ONCE(1);
1246 /* fall through */
1247 case NL80211_BAND_2GHZ:
1248 case NL80211_BAND_60GHZ:
1249 chan_increment = 1;
1250 break;
1251 case NL80211_BAND_5GHZ:
1252 chan_increment = 4;
1253 break;
1254 }
1255
1256 /* find channel */
1257 while (country_ie_len >= 3) {
1258 u8 first_channel = triplet->chans.first_channel;
1259
1260 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1261 goto next;
1262
1263 for (i = 0; i < triplet->chans.num_channels; i++) {
1264 if (first_channel + i * chan_increment == chan) {
1265 have_chan_pwr = true;
1266 *chan_pwr = triplet->chans.max_power;
1267 break;
1268 }
1269 }
1270 if (have_chan_pwr)
1271 break;
1272
1273 next:
1274 triplet++;
1275 country_ie_len -= 3;
1276 }
1277
1278 if (have_chan_pwr && pwr_constr_elem)
1279 *pwr_reduction = *pwr_constr_elem;
1280 else
1281 *pwr_reduction = 0;
1282
1283 return have_chan_pwr;
1284 }
1285
1286 static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata,
1287 struct ieee80211_channel *channel,
1288 const u8 *cisco_dtpc_ie,
1289 int *pwr_level)
1290 {
1291 /* From practical testing, the first data byte of the DTPC element
1292 * seems to contain the requested dBm level, and the CLI on Cisco
1293 * APs clearly state the range is -127 to 127 dBm, which indicates
1294 * a signed byte, although it seemingly never actually goes negative.
1295 * The other byte seems to always be zero.
1296 */
1297 *pwr_level = (__s8)cisco_dtpc_ie[4];
1298 }
1299
1300 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1301 struct ieee80211_channel *channel,
1302 struct ieee80211_mgmt *mgmt,
1303 const u8 *country_ie, u8 country_ie_len,
1304 const u8 *pwr_constr_ie,
1305 const u8 *cisco_dtpc_ie)
1306 {
1307 bool has_80211h_pwr = false, has_cisco_pwr = false;
1308 int chan_pwr = 0, pwr_reduction_80211h = 0;
1309 int pwr_level_cisco, pwr_level_80211h;
1310 int new_ap_level;
1311 __le16 capab = mgmt->u.probe_resp.capab_info;
1312
1313 if (country_ie &&
1314 (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) ||
1315 capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) {
1316 has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
1317 sdata, channel, country_ie, country_ie_len,
1318 pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1319 pwr_level_80211h =
1320 max_t(int, 0, chan_pwr - pwr_reduction_80211h);
1321 }
1322
1323 if (cisco_dtpc_ie) {
1324 ieee80211_find_cisco_dtpc(
1325 sdata, channel, cisco_dtpc_ie, &pwr_level_cisco);
1326 has_cisco_pwr = true;
1327 }
1328
1329 if (!has_80211h_pwr && !has_cisco_pwr)
1330 return 0;
1331
1332 /* If we have both 802.11h and Cisco DTPC, apply both limits
1333 * by picking the smallest of the two power levels advertised.
1334 */
1335 if (has_80211h_pwr &&
1336 (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) {
1337 new_ap_level = pwr_level_80211h;
1338
1339 if (sdata->ap_power_level == new_ap_level)
1340 return 0;
1341
1342 sdata_dbg(sdata,
1343 "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1344 pwr_level_80211h, chan_pwr, pwr_reduction_80211h,
1345 sdata->u.mgd.bssid);
1346 } else { /* has_cisco_pwr is always true here. */
1347 new_ap_level = pwr_level_cisco;
1348
1349 if (sdata->ap_power_level == new_ap_level)
1350 return 0;
1351
1352 sdata_dbg(sdata,
1353 "Limiting TX power to %d dBm as advertised by %pM\n",
1354 pwr_level_cisco, sdata->u.mgd.bssid);
1355 }
1356
1357 sdata->ap_power_level = new_ap_level;
1358 if (__ieee80211_recalc_txpower(sdata))
1359 return BSS_CHANGED_TXPOWER;
1360 return 0;
1361 }
1362
1363 /* powersave */
1364 static void ieee80211_enable_ps(struct ieee80211_local *local,
1365 struct ieee80211_sub_if_data *sdata)
1366 {
1367 struct ieee80211_conf *conf = &local->hw.conf;
1368
1369 /*
1370 * If we are scanning right now then the parameters will
1371 * take effect when scan finishes.
1372 */
1373 if (local->scanning)
1374 return;
1375
1376 if (conf->dynamic_ps_timeout > 0 &&
1377 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) {
1378 mod_timer(&local->dynamic_ps_timer, jiffies +
1379 msecs_to_jiffies(conf->dynamic_ps_timeout));
1380 } else {
1381 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
1382 ieee80211_send_nullfunc(local, sdata, true);
1383
1384 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1385 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
1386 return;
1387
1388 conf->flags |= IEEE80211_CONF_PS;
1389 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1390 }
1391 }
1392
1393 static void ieee80211_change_ps(struct ieee80211_local *local)
1394 {
1395 struct ieee80211_conf *conf = &local->hw.conf;
1396
1397 if (local->ps_sdata) {
1398 ieee80211_enable_ps(local, local->ps_sdata);
1399 } else if (conf->flags & IEEE80211_CONF_PS) {
1400 conf->flags &= ~IEEE80211_CONF_PS;
1401 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1402 del_timer_sync(&local->dynamic_ps_timer);
1403 cancel_work_sync(&local->dynamic_ps_enable_work);
1404 }
1405 }
1406
1407 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1408 {
1409 struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1410 struct sta_info *sta = NULL;
1411 bool authorized = false;
1412
1413 if (!mgd->powersave)
1414 return false;
1415
1416 if (mgd->broken_ap)
1417 return false;
1418
1419 if (!mgd->associated)
1420 return false;
1421
1422 if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1423 return false;
1424
1425 if (!mgd->have_beacon)
1426 return false;
1427
1428 rcu_read_lock();
1429 sta = sta_info_get(sdata, mgd->bssid);
1430 if (sta)
1431 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1432 rcu_read_unlock();
1433
1434 return authorized;
1435 }
1436
1437 /* need to hold RTNL or interface lock */
1438 void ieee80211_recalc_ps(struct ieee80211_local *local)
1439 {
1440 struct ieee80211_sub_if_data *sdata, *found = NULL;
1441 int count = 0;
1442 int timeout;
1443
1444 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) {
1445 local->ps_sdata = NULL;
1446 return;
1447 }
1448
1449 list_for_each_entry(sdata, &local->interfaces, list) {
1450 if (!ieee80211_sdata_running(sdata))
1451 continue;
1452 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1453 /* If an AP vif is found, then disable PS
1454 * by setting the count to zero thereby setting
1455 * ps_sdata to NULL.
1456 */
1457 count = 0;
1458 break;
1459 }
1460 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1461 continue;
1462 found = sdata;
1463 count++;
1464 }
1465
1466 if (count == 1 && ieee80211_powersave_allowed(found)) {
1467 u8 dtimper = found->u.mgd.dtim_period;
1468
1469 timeout = local->dynamic_ps_forced_timeout;
1470 if (timeout < 0)
1471 timeout = 100;
1472 local->hw.conf.dynamic_ps_timeout = timeout;
1473
1474 /* If the TIM IE is invalid, pretend the value is 1 */
1475 if (!dtimper)
1476 dtimper = 1;
1477
1478 local->hw.conf.ps_dtim_period = dtimper;
1479 local->ps_sdata = found;
1480 } else {
1481 local->ps_sdata = NULL;
1482 }
1483
1484 ieee80211_change_ps(local);
1485 }
1486
1487 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1488 {
1489 bool ps_allowed = ieee80211_powersave_allowed(sdata);
1490
1491 if (sdata->vif.bss_conf.ps != ps_allowed) {
1492 sdata->vif.bss_conf.ps = ps_allowed;
1493 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1494 }
1495 }
1496
1497 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1498 {
1499 struct ieee80211_local *local =
1500 container_of(work, struct ieee80211_local,
1501 dynamic_ps_disable_work);
1502
1503 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1504 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1505 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1506 }
1507
1508 ieee80211_wake_queues_by_reason(&local->hw,
1509 IEEE80211_MAX_QUEUE_MAP,
1510 IEEE80211_QUEUE_STOP_REASON_PS,
1511 false);
1512 }
1513
1514 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1515 {
1516 struct ieee80211_local *local =
1517 container_of(work, struct ieee80211_local,
1518 dynamic_ps_enable_work);
1519 struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1520 struct ieee80211_if_managed *ifmgd;
1521 unsigned long flags;
1522 int q;
1523
1524 /* can only happen when PS was just disabled anyway */
1525 if (!sdata)
1526 return;
1527
1528 ifmgd = &sdata->u.mgd;
1529
1530 if (local->hw.conf.flags & IEEE80211_CONF_PS)
1531 return;
1532
1533 if (local->hw.conf.dynamic_ps_timeout > 0) {
1534 /* don't enter PS if TX frames are pending */
1535 if (drv_tx_frames_pending(local)) {
1536 mod_timer(&local->dynamic_ps_timer, jiffies +
1537 msecs_to_jiffies(
1538 local->hw.conf.dynamic_ps_timeout));
1539 return;
1540 }
1541
1542 /*
1543 * transmission can be stopped by others which leads to
1544 * dynamic_ps_timer expiry. Postpone the ps timer if it
1545 * is not the actual idle state.
1546 */
1547 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1548 for (q = 0; q < local->hw.queues; q++) {
1549 if (local->queue_stop_reasons[q]) {
1550 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1551 flags);
1552 mod_timer(&local->dynamic_ps_timer, jiffies +
1553 msecs_to_jiffies(
1554 local->hw.conf.dynamic_ps_timeout));
1555 return;
1556 }
1557 }
1558 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1559 }
1560
1561 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1562 !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1563 if (drv_tx_frames_pending(local)) {
1564 mod_timer(&local->dynamic_ps_timer, jiffies +
1565 msecs_to_jiffies(
1566 local->hw.conf.dynamic_ps_timeout));
1567 } else {
1568 ieee80211_send_nullfunc(local, sdata, true);
1569 /* Flush to get the tx status of nullfunc frame */
1570 ieee80211_flush_queues(local, sdata, false);
1571 }
1572 }
1573
1574 if (!(ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
1575 ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) ||
1576 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1577 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1578 local->hw.conf.flags |= IEEE80211_CONF_PS;
1579 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1580 }
1581 }
1582
1583 void ieee80211_dynamic_ps_timer(struct timer_list *t)
1584 {
1585 struct ieee80211_local *local = from_timer(local, t, dynamic_ps_timer);
1586
1587 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1588 }
1589
1590 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1591 {
1592 struct delayed_work *delayed_work = to_delayed_work(work);
1593 struct ieee80211_sub_if_data *sdata =
1594 container_of(delayed_work, struct ieee80211_sub_if_data,
1595 dfs_cac_timer_work);
1596 struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1597
1598 mutex_lock(&sdata->local->mtx);
1599 if (sdata->wdev.cac_started) {
1600 ieee80211_vif_release_channel(sdata);
1601 cfg80211_cac_event(sdata->dev, &chandef,
1602 NL80211_RADAR_CAC_FINISHED,
1603 GFP_KERNEL);
1604 }
1605 mutex_unlock(&sdata->local->mtx);
1606 }
1607
1608 static bool
1609 __ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1610 {
1611 struct ieee80211_local *local = sdata->local;
1612 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1613 bool ret = false;
1614 int ac;
1615
1616 if (local->hw.queues < IEEE80211_NUM_ACS)
1617 return false;
1618
1619 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1620 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
1621 int non_acm_ac;
1622 unsigned long now = jiffies;
1623
1624 if (tx_tspec->action == TX_TSPEC_ACTION_NONE &&
1625 tx_tspec->admitted_time &&
1626 time_after(now, tx_tspec->time_slice_start + HZ)) {
1627 tx_tspec->consumed_tx_time = 0;
1628 tx_tspec->time_slice_start = now;
1629
1630 if (tx_tspec->downgraded)
1631 tx_tspec->action =
1632 TX_TSPEC_ACTION_STOP_DOWNGRADE;
1633 }
1634
1635 switch (tx_tspec->action) {
1636 case TX_TSPEC_ACTION_STOP_DOWNGRADE:
1637 /* take the original parameters */
1638 if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac]))
1639 sdata_err(sdata,
1640 "failed to set TX queue parameters for queue %d\n",
1641 ac);
1642 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1643 tx_tspec->downgraded = false;
1644 ret = true;
1645 break;
1646 case TX_TSPEC_ACTION_DOWNGRADE:
1647 if (time_after(now, tx_tspec->time_slice_start + HZ)) {
1648 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1649 ret = true;
1650 break;
1651 }
1652 /* downgrade next lower non-ACM AC */
1653 for (non_acm_ac = ac + 1;
1654 non_acm_ac < IEEE80211_NUM_ACS;
1655 non_acm_ac++)
1656 if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac)))
1657 break;
1658 /* Usually the loop will result in using BK even if it
1659 * requires admission control, but such a configuration
1660 * makes no sense and we have to transmit somehow - the
1661 * AC selection does the same thing.
1662 * If we started out trying to downgrade from BK, then
1663 * the extra condition here might be needed.
1664 */
1665 if (non_acm_ac >= IEEE80211_NUM_ACS)
1666 non_acm_ac = IEEE80211_AC_BK;
1667 if (drv_conf_tx(local, sdata, ac,
1668 &sdata->tx_conf[non_acm_ac]))
1669 sdata_err(sdata,
1670 "failed to set TX queue parameters for queue %d\n",
1671 ac);
1672 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1673 ret = true;
1674 schedule_delayed_work(&ifmgd->tx_tspec_wk,
1675 tx_tspec->time_slice_start + HZ - now + 1);
1676 break;
1677 case TX_TSPEC_ACTION_NONE:
1678 /* nothing now */
1679 break;
1680 }
1681 }
1682
1683 return ret;
1684 }
1685
1686 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1687 {
1688 if (__ieee80211_sta_handle_tspec_ac_params(sdata))
1689 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
1690 }
1691
1692 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work)
1693 {
1694 struct ieee80211_sub_if_data *sdata;
1695
1696 sdata = container_of(work, struct ieee80211_sub_if_data,
1697 u.mgd.tx_tspec_wk.work);
1698 ieee80211_sta_handle_tspec_ac_params(sdata);
1699 }
1700
1701 /* MLME */
1702 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1703 struct ieee80211_sub_if_data *sdata,
1704 const u8 *wmm_param, size_t wmm_param_len)
1705 {
1706 struct ieee80211_tx_queue_params params[IEEE80211_NUM_ACS];
1707 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1708 size_t left;
1709 int count, ac;
1710 const u8 *pos;
1711 u8 uapsd_queues = 0;
1712
1713 if (!local->ops->conf_tx)
1714 return false;
1715
1716 if (local->hw.queues < IEEE80211_NUM_ACS)
1717 return false;
1718
1719 if (!wmm_param)
1720 return false;
1721
1722 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1723 return false;
1724
1725 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1726 uapsd_queues = ifmgd->uapsd_queues;
1727
1728 count = wmm_param[6] & 0x0f;
1729 if (count == ifmgd->wmm_last_param_set)
1730 return false;
1731 ifmgd->wmm_last_param_set = count;
1732
1733 pos = wmm_param + 8;
1734 left = wmm_param_len - 8;
1735
1736 memset(&params, 0, sizeof(params));
1737
1738 sdata->wmm_acm = 0;
1739 for (; left >= 4; left -= 4, pos += 4) {
1740 int aci = (pos[0] >> 5) & 0x03;
1741 int acm = (pos[0] >> 4) & 0x01;
1742 bool uapsd = false;
1743
1744 switch (aci) {
1745 case 1: /* AC_BK */
1746 ac = IEEE80211_AC_BK;
1747 if (acm)
1748 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1749 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1750 uapsd = true;
1751 break;
1752 case 2: /* AC_VI */
1753 ac = IEEE80211_AC_VI;
1754 if (acm)
1755 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1756 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1757 uapsd = true;
1758 break;
1759 case 3: /* AC_VO */
1760 ac = IEEE80211_AC_VO;
1761 if (acm)
1762 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1763 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1764 uapsd = true;
1765 break;
1766 case 0: /* AC_BE */
1767 default:
1768 ac = IEEE80211_AC_BE;
1769 if (acm)
1770 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1771 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1772 uapsd = true;
1773 break;
1774 }
1775
1776 params[ac].aifs = pos[0] & 0x0f;
1777
1778 if (params[ac].aifs < 2) {
1779 sdata_info(sdata,
1780 "AP has invalid WMM params (AIFSN=%d for ACI %d), will use 2\n",
1781 params[ac].aifs, aci);
1782 params[ac].aifs = 2;
1783 }
1784 params[ac].cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1785 params[ac].cw_min = ecw2cw(pos[1] & 0x0f);
1786 params[ac].txop = get_unaligned_le16(pos + 2);
1787 params[ac].acm = acm;
1788 params[ac].uapsd = uapsd;
1789
1790 if (params[ac].cw_min > params[ac].cw_max) {
1791 sdata_info(sdata,
1792 "AP has invalid WMM params (CWmin/max=%d/%d for ACI %d), using defaults\n",
1793 params[ac].cw_min, params[ac].cw_max, aci);
1794 return false;
1795 }
1796 }
1797
1798 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1799 mlme_dbg(sdata,
1800 "WMM AC=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n",
1801 ac, params[ac].acm,
1802 params[ac].aifs, params[ac].cw_min, params[ac].cw_max,
1803 params[ac].txop, params[ac].uapsd,
1804 ifmgd->tx_tspec[ac].downgraded);
1805 sdata->tx_conf[ac] = params[ac];
1806 if (!ifmgd->tx_tspec[ac].downgraded &&
1807 drv_conf_tx(local, sdata, ac, &params[ac]))
1808 sdata_err(sdata,
1809 "failed to set TX queue parameters for AC %d\n",
1810 ac);
1811 }
1812
1813 /* enable WMM or activate new settings */
1814 sdata->vif.bss_conf.qos = true;
1815 return true;
1816 }
1817
1818 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1819 {
1820 lockdep_assert_held(&sdata->local->mtx);
1821
1822 sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1823 ieee80211_run_deferred_scan(sdata->local);
1824 }
1825
1826 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1827 {
1828 mutex_lock(&sdata->local->mtx);
1829 __ieee80211_stop_poll(sdata);
1830 mutex_unlock(&sdata->local->mtx);
1831 }
1832
1833 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1834 u16 capab, bool erp_valid, u8 erp)
1835 {
1836 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1837 struct ieee80211_supported_band *sband;
1838 u32 changed = 0;
1839 bool use_protection;
1840 bool use_short_preamble;
1841 bool use_short_slot;
1842
1843 sband = ieee80211_get_sband(sdata);
1844 if (!sband)
1845 return changed;
1846
1847 if (erp_valid) {
1848 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1849 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1850 } else {
1851 use_protection = false;
1852 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1853 }
1854
1855 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1856 if (sband->band == NL80211_BAND_5GHZ)
1857 use_short_slot = true;
1858
1859 if (use_protection != bss_conf->use_cts_prot) {
1860 bss_conf->use_cts_prot = use_protection;
1861 changed |= BSS_CHANGED_ERP_CTS_PROT;
1862 }
1863
1864 if (use_short_preamble != bss_conf->use_short_preamble) {
1865 bss_conf->use_short_preamble = use_short_preamble;
1866 changed |= BSS_CHANGED_ERP_PREAMBLE;
1867 }
1868
1869 if (use_short_slot != bss_conf->use_short_slot) {
1870 bss_conf->use_short_slot = use_short_slot;
1871 changed |= BSS_CHANGED_ERP_SLOT;
1872 }
1873
1874 return changed;
1875 }
1876
1877 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1878 struct cfg80211_bss *cbss,
1879 u32 bss_info_changed)
1880 {
1881 struct ieee80211_bss *bss = (void *)cbss->priv;
1882 struct ieee80211_local *local = sdata->local;
1883 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1884
1885 bss_info_changed |= BSS_CHANGED_ASSOC;
1886 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1887 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1888
1889 sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1890 beacon_loss_count * bss_conf->beacon_int));
1891
1892 sdata->u.mgd.associated = cbss;
1893 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1894
1895 ieee80211_check_rate_mask(sdata);
1896
1897 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1898
1899 if (sdata->vif.p2p ||
1900 sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) {
1901 const struct cfg80211_bss_ies *ies;
1902
1903 rcu_read_lock();
1904 ies = rcu_dereference(cbss->ies);
1905 if (ies) {
1906 int ret;
1907
1908 ret = cfg80211_get_p2p_attr(
1909 ies->data, ies->len,
1910 IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1911 (u8 *) &bss_conf->p2p_noa_attr,
1912 sizeof(bss_conf->p2p_noa_attr));
1913 if (ret >= 2) {
1914 sdata->u.mgd.p2p_noa_index =
1915 bss_conf->p2p_noa_attr.index;
1916 bss_info_changed |= BSS_CHANGED_P2P_PS;
1917 }
1918 }
1919 rcu_read_unlock();
1920 }
1921
1922 /* just to be sure */
1923 ieee80211_stop_poll(sdata);
1924
1925 ieee80211_led_assoc(local, 1);
1926
1927 if (sdata->u.mgd.have_beacon) {
1928 /*
1929 * If the AP is buggy we may get here with no DTIM period
1930 * known, so assume it's 1 which is the only safe assumption
1931 * in that case, although if the TIM IE is broken powersave
1932 * probably just won't work at all.
1933 */
1934 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1935 bss_conf->beacon_rate = bss->beacon_rate;
1936 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1937 } else {
1938 bss_conf->beacon_rate = NULL;
1939 bss_conf->dtim_period = 0;
1940 }
1941
1942 bss_conf->assoc = 1;
1943
1944 /* Tell the driver to monitor connection quality (if supported) */
1945 if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1946 bss_conf->cqm_rssi_thold)
1947 bss_info_changed |= BSS_CHANGED_CQM;
1948
1949 /* Enable ARP filtering */
1950 if (bss_conf->arp_addr_cnt)
1951 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1952
1953 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1954
1955 mutex_lock(&local->iflist_mtx);
1956 ieee80211_recalc_ps(local);
1957 mutex_unlock(&local->iflist_mtx);
1958
1959 ieee80211_recalc_smps(sdata);
1960 ieee80211_recalc_ps_vif(sdata);
1961
1962 netif_carrier_on(sdata->dev);
1963 }
1964
1965 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1966 u16 stype, u16 reason, bool tx,
1967 u8 *frame_buf)
1968 {
1969 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1970 struct ieee80211_local *local = sdata->local;
1971 u32 changed = 0;
1972
1973 sdata_assert_lock(sdata);
1974
1975 if (WARN_ON_ONCE(tx && !frame_buf))
1976 return;
1977
1978 if (WARN_ON(!ifmgd->associated))
1979 return;
1980
1981 ieee80211_stop_poll(sdata);
1982
1983 ifmgd->associated = NULL;
1984 netif_carrier_off(sdata->dev);
1985
1986 /*
1987 * if we want to get out of ps before disassoc (why?) we have
1988 * to do it before sending disassoc, as otherwise the null-packet
1989 * won't be valid.
1990 */
1991 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1992 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1993 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1994 }
1995 local->ps_sdata = NULL;
1996
1997 /* disable per-vif ps */
1998 ieee80211_recalc_ps_vif(sdata);
1999
2000 /* make sure ongoing transmission finishes */
2001 synchronize_net();
2002
2003 /*
2004 * drop any frame before deauth/disassoc, this can be data or
2005 * management frame. Since we are disconnecting, we should not
2006 * insist sending these frames which can take time and delay
2007 * the disconnection and possible the roaming.
2008 */
2009 if (tx)
2010 ieee80211_flush_queues(local, sdata, true);
2011
2012 /* deauthenticate/disassociate now */
2013 if (tx || frame_buf) {
2014 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2015
2016 /*
2017 * In multi channel scenarios guarantee that the virtual
2018 * interface is granted immediate airtime to transmit the
2019 * deauthentication frame by calling mgd_prepare_tx, if the
2020 * driver requested so.
2021 */
2022 if (ieee80211_hw_check(&local->hw, DEAUTH_NEED_MGD_TX_PREP) &&
2023 !ifmgd->have_beacon)
2024 drv_mgd_prepare_tx(sdata->local, sdata);
2025
2026 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
2027 reason, tx, frame_buf);
2028 }
2029
2030 /* flush out frame - make sure the deauth was actually sent */
2031 if (tx)
2032 ieee80211_flush_queues(local, sdata, false);
2033
2034 /* clear bssid only after building the needed mgmt frames */
2035 eth_zero_addr(ifmgd->bssid);
2036
2037 /* remove AP and TDLS peers */
2038 sta_info_flush(sdata);
2039
2040 /* finally reset all BSS / config parameters */
2041 changed |= ieee80211_reset_erp_info(sdata);
2042
2043 ieee80211_led_assoc(local, 0);
2044 changed |= BSS_CHANGED_ASSOC;
2045 sdata->vif.bss_conf.assoc = false;
2046
2047 ifmgd->p2p_noa_index = -1;
2048 memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
2049 sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2050
2051 /* on the next assoc, re-program HT/VHT parameters */
2052 memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
2053 memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2054 memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
2055 memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2056
2057 /* reset MU-MIMO ownership and group data */
2058 memset(sdata->vif.bss_conf.mu_group.membership, 0,
2059 sizeof(sdata->vif.bss_conf.mu_group.membership));
2060 memset(sdata->vif.bss_conf.mu_group.position, 0,
2061 sizeof(sdata->vif.bss_conf.mu_group.position));
2062 changed |= BSS_CHANGED_MU_GROUPS;
2063 sdata->vif.mu_mimo_owner = false;
2064
2065 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2066
2067 del_timer_sync(&local->dynamic_ps_timer);
2068 cancel_work_sync(&local->dynamic_ps_enable_work);
2069
2070 /* Disable ARP filtering */
2071 if (sdata->vif.bss_conf.arp_addr_cnt)
2072 changed |= BSS_CHANGED_ARP_FILTER;
2073
2074 sdata->vif.bss_conf.qos = false;
2075 changed |= BSS_CHANGED_QOS;
2076
2077 /* The BSSID (not really interesting) and HT changed */
2078 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
2079 ieee80211_bss_info_change_notify(sdata, changed);
2080
2081 /* disassociated - set to defaults now */
2082 ieee80211_set_wmm_default(sdata, false, false);
2083
2084 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
2085 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
2086 del_timer_sync(&sdata->u.mgd.timer);
2087 del_timer_sync(&sdata->u.mgd.chswitch_timer);
2088
2089 sdata->vif.bss_conf.dtim_period = 0;
2090 sdata->vif.bss_conf.beacon_rate = NULL;
2091
2092 ifmgd->have_beacon = false;
2093
2094 ifmgd->flags = 0;
2095 mutex_lock(&local->mtx);
2096 ieee80211_vif_release_channel(sdata);
2097
2098 sdata->vif.csa_active = false;
2099 ifmgd->csa_waiting_bcn = false;
2100 ifmgd->csa_ignored_same_chan = false;
2101 if (sdata->csa_block_tx) {
2102 ieee80211_wake_vif_queues(local, sdata,
2103 IEEE80211_QUEUE_STOP_REASON_CSA);
2104 sdata->csa_block_tx = false;
2105 }
2106 mutex_unlock(&local->mtx);
2107
2108 /* existing TX TSPEC sessions no longer exist */
2109 memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
2110 cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);
2111
2112 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2113 }
2114
2115 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
2116 struct ieee80211_hdr *hdr)
2117 {
2118 /*
2119 * We can postpone the mgd.timer whenever receiving unicast frames
2120 * from AP because we know that the connection is working both ways
2121 * at that time. But multicast frames (and hence also beacons) must
2122 * be ignored here, because we need to trigger the timer during
2123 * data idle periods for sending the periodic probe request to the
2124 * AP we're connected to.
2125 */
2126 if (is_multicast_ether_addr(hdr->addr1))
2127 return;
2128
2129 ieee80211_sta_reset_conn_monitor(sdata);
2130 }
2131
2132 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
2133 {
2134 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2135 struct ieee80211_local *local = sdata->local;
2136
2137 mutex_lock(&local->mtx);
2138 if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
2139 goto out;
2140
2141 __ieee80211_stop_poll(sdata);
2142
2143 mutex_lock(&local->iflist_mtx);
2144 ieee80211_recalc_ps(local);
2145 mutex_unlock(&local->iflist_mtx);
2146
2147 if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
2148 goto out;
2149
2150 /*
2151 * We've received a probe response, but are not sure whether
2152 * we have or will be receiving any beacons or data, so let's
2153 * schedule the timers again, just in case.
2154 */
2155 ieee80211_sta_reset_beacon_monitor(sdata);
2156
2157 mod_timer(&ifmgd->conn_mon_timer,
2158 round_jiffies_up(jiffies +
2159 IEEE80211_CONNECTION_IDLE_TIME));
2160 out:
2161 mutex_unlock(&local->mtx);
2162 }
2163
2164 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
2165 struct ieee80211_hdr *hdr,
2166 u16 tx_time)
2167 {
2168 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2169 u16 tid = ieee80211_get_tid(hdr);
2170 int ac = ieee80211_ac_from_tid(tid);
2171 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
2172 unsigned long now = jiffies;
2173
2174 if (likely(!tx_tspec->admitted_time))
2175 return;
2176
2177 if (time_after(now, tx_tspec->time_slice_start + HZ)) {
2178 tx_tspec->consumed_tx_time = 0;
2179 tx_tspec->time_slice_start = now;
2180
2181 if (tx_tspec->downgraded) {
2182 tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE;
2183 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2184 }
2185 }
2186
2187 if (tx_tspec->downgraded)
2188 return;
2189
2190 tx_tspec->consumed_tx_time += tx_time;
2191
2192 if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) {
2193 tx_tspec->downgraded = true;
2194 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE;
2195 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2196 }
2197 }
2198
2199 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2200 struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2201 {
2202 ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);
2203
2204 if (!ieee80211_is_data(hdr->frame_control))
2205 return;
2206
2207 if (ieee80211_is_nullfunc(hdr->frame_control) &&
2208 sdata->u.mgd.probe_send_count > 0) {
2209 if (ack)
2210 ieee80211_sta_reset_conn_monitor(sdata);
2211 else
2212 sdata->u.mgd.nullfunc_failed = true;
2213 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2214 return;
2215 }
2216
2217 if (ack)
2218 ieee80211_sta_reset_conn_monitor(sdata);
2219 }
2220
2221 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
2222 {
2223 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2224 const u8 *ssid;
2225 u8 *dst = ifmgd->associated->bssid;
2226 u8 unicast_limit = max(1, max_probe_tries - 3);
2227 struct sta_info *sta;
2228
2229 /*
2230 * Try sending broadcast probe requests for the last three
2231 * probe requests after the first ones failed since some
2232 * buggy APs only support broadcast probe requests.
2233 */
2234 if (ifmgd->probe_send_count >= unicast_limit)
2235 dst = NULL;
2236
2237 /*
2238 * When the hardware reports an accurate Tx ACK status, it's
2239 * better to send a nullfunc frame instead of a probe request,
2240 * as it will kick us off the AP quickly if we aren't associated
2241 * anymore. The timeout will be reset if the frame is ACKed by
2242 * the AP.
2243 */
2244 ifmgd->probe_send_count++;
2245
2246 if (dst) {
2247 mutex_lock(&sdata->local->sta_mtx);
2248 sta = sta_info_get(sdata, dst);
2249 if (!WARN_ON(!sta))
2250 ieee80211_check_fast_rx(sta);
2251 mutex_unlock(&sdata->local->sta_mtx);
2252 }
2253
2254 if (ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
2255 ifmgd->nullfunc_failed = false;
2256 ieee80211_send_nullfunc(sdata->local, sdata, false);
2257 } else {
2258 int ssid_len;
2259
2260 rcu_read_lock();
2261 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2262 if (WARN_ON_ONCE(ssid == NULL))
2263 ssid_len = 0;
2264 else
2265 ssid_len = ssid[1];
2266
2267 ieee80211_send_probe_req(sdata, sdata->vif.addr, dst,
2268 ssid + 2, ssid_len, NULL,
2269 0, (u32) -1, true, 0,
2270 ifmgd->associated->channel, false);
2271 rcu_read_unlock();
2272 }
2273
2274 ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2275 run_again(sdata, ifmgd->probe_timeout);
2276 }
2277
2278 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
2279 bool beacon)
2280 {
2281 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2282 bool already = false;
2283
2284 if (!ieee80211_sdata_running(sdata))
2285 return;
2286
2287 sdata_lock(sdata);
2288
2289 if (!ifmgd->associated)
2290 goto out;
2291
2292 mutex_lock(&sdata->local->mtx);
2293
2294 if (sdata->local->tmp_channel || sdata->local->scanning) {
2295 mutex_unlock(&sdata->local->mtx);
2296 goto out;
2297 }
2298
2299 if (beacon) {
2300 mlme_dbg_ratelimited(sdata,
2301 "detected beacon loss from AP (missed %d beacons) - probing\n",
2302 beacon_loss_count);
2303
2304 ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL);
2305 }
2306
2307 /*
2308 * The driver/our work has already reported this event or the
2309 * connection monitoring has kicked in and we have already sent
2310 * a probe request. Or maybe the AP died and the driver keeps
2311 * reporting until we disassociate...
2312 *
2313 * In either case we have to ignore the current call to this
2314 * function (except for setting the correct probe reason bit)
2315 * because otherwise we would reset the timer every time and
2316 * never check whether we received a probe response!
2317 */
2318 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
2319 already = true;
2320
2321 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2322
2323 mutex_unlock(&sdata->local->mtx);
2324
2325 if (already)
2326 goto out;
2327
2328 mutex_lock(&sdata->local->iflist_mtx);
2329 ieee80211_recalc_ps(sdata->local);
2330 mutex_unlock(&sdata->local->iflist_mtx);
2331
2332 ifmgd->probe_send_count = 0;
2333 ieee80211_mgd_probe_ap_send(sdata);
2334 out:
2335 sdata_unlock(sdata);
2336 }
2337
2338 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2339 struct ieee80211_vif *vif)
2340 {
2341 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2342 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2343 struct cfg80211_bss *cbss;
2344 struct sk_buff *skb;
2345 const u8 *ssid;
2346 int ssid_len;
2347
2348 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2349 return NULL;
2350
2351 sdata_assert_lock(sdata);
2352
2353 if (ifmgd->associated)
2354 cbss = ifmgd->associated;
2355 else if (ifmgd->auth_data)
2356 cbss = ifmgd->auth_data->bss;
2357 else if (ifmgd->assoc_data)
2358 cbss = ifmgd->assoc_data->bss;
2359 else
2360 return NULL;
2361
2362 rcu_read_lock();
2363 ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2364 if (WARN_ON_ONCE(ssid == NULL))
2365 ssid_len = 0;
2366 else
2367 ssid_len = ssid[1];
2368
2369 skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
2370 (u32) -1, cbss->channel,
2371 ssid + 2, ssid_len,
2372 NULL, 0, true);
2373 rcu_read_unlock();
2374
2375 return skb;
2376 }
2377 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2378
2379 static void ieee80211_report_disconnect(struct ieee80211_sub_if_data *sdata,
2380 const u8 *buf, size_t len, bool tx,
2381 u16 reason)
2382 {
2383 struct ieee80211_event event = {
2384 .type = MLME_EVENT,
2385 .u.mlme.data = tx ? DEAUTH_TX_EVENT : DEAUTH_RX_EVENT,
2386 .u.mlme.reason = reason,
2387 };
2388
2389 if (tx)
2390 cfg80211_tx_mlme_mgmt(sdata->dev, buf, len);
2391 else
2392 cfg80211_rx_mlme_mgmt(sdata->dev, buf, len);
2393
2394 drv_event_callback(sdata->local, sdata, &event);
2395 }
2396
2397 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2398 {
2399 struct ieee80211_local *local = sdata->local;
2400 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2401 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2402
2403 sdata_lock(sdata);
2404 if (!ifmgd->associated) {
2405 sdata_unlock(sdata);
2406 return;
2407 }
2408
2409 /* AP is probably out of range (or not reachable for another reason) so
2410 * remove the bss struct for that AP.
2411 */
2412 cfg80211_unlink_bss(local->hw.wiphy, ifmgd->associated);
2413
2414 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2415 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2416 true, frame_buf);
2417 mutex_lock(&local->mtx);
2418 sdata->vif.csa_active = false;
2419 ifmgd->csa_waiting_bcn = false;
2420 if (sdata->csa_block_tx) {
2421 ieee80211_wake_vif_queues(local, sdata,
2422 IEEE80211_QUEUE_STOP_REASON_CSA);
2423 sdata->csa_block_tx = false;
2424 }
2425 mutex_unlock(&local->mtx);
2426
2427 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
2428 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2429
2430 sdata_unlock(sdata);
2431 }
2432
2433 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2434 {
2435 struct ieee80211_sub_if_data *sdata =
2436 container_of(work, struct ieee80211_sub_if_data,
2437 u.mgd.beacon_connection_loss_work);
2438 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2439
2440 if (ifmgd->associated)
2441 ifmgd->beacon_loss_count++;
2442
2443 if (ifmgd->connection_loss) {
2444 sdata_info(sdata, "Connection to AP %pM lost\n",
2445 ifmgd->bssid);
2446 __ieee80211_disconnect(sdata);
2447 } else {
2448 ieee80211_mgd_probe_ap(sdata, true);
2449 }
2450 }
2451
2452 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2453 {
2454 struct ieee80211_sub_if_data *sdata =
2455 container_of(work, struct ieee80211_sub_if_data,
2456 u.mgd.csa_connection_drop_work);
2457
2458 __ieee80211_disconnect(sdata);
2459 }
2460
2461 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2462 {
2463 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2464 struct ieee80211_hw *hw = &sdata->local->hw;
2465
2466 trace_api_beacon_loss(sdata);
2467
2468 sdata->u.mgd.connection_loss = false;
2469 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2470 }
2471 EXPORT_SYMBOL(ieee80211_beacon_loss);
2472
2473 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2474 {
2475 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2476 struct ieee80211_hw *hw = &sdata->local->hw;
2477
2478 trace_api_connection_loss(sdata);
2479
2480 sdata->u.mgd.connection_loss = true;
2481 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2482 }
2483 EXPORT_SYMBOL(ieee80211_connection_loss);
2484
2485
2486 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2487 bool assoc)
2488 {
2489 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2490
2491 sdata_assert_lock(sdata);
2492
2493 if (!assoc) {
2494 /*
2495 * we are not authenticated yet, the only timer that could be
2496 * running is the timeout for the authentication response which
2497 * which is not relevant anymore.
2498 */
2499 del_timer_sync(&sdata->u.mgd.timer);
2500 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2501
2502 eth_zero_addr(sdata->u.mgd.bssid);
2503 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2504 sdata->u.mgd.flags = 0;
2505 mutex_lock(&sdata->local->mtx);
2506 ieee80211_vif_release_channel(sdata);
2507 mutex_unlock(&sdata->local->mtx);
2508 }
2509
2510 cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2511 kfree(auth_data);
2512 sdata->u.mgd.auth_data = NULL;
2513 }
2514
2515 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2516 bool assoc, bool abandon)
2517 {
2518 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2519
2520 sdata_assert_lock(sdata);
2521
2522 if (!assoc) {
2523 /*
2524 * we are not associated yet, the only timer that could be
2525 * running is the timeout for the association response which
2526 * which is not relevant anymore.
2527 */
2528 del_timer_sync(&sdata->u.mgd.timer);
2529 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2530
2531 eth_zero_addr(sdata->u.mgd.bssid);
2532 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2533 sdata->u.mgd.flags = 0;
2534 sdata->vif.mu_mimo_owner = false;
2535
2536 mutex_lock(&sdata->local->mtx);
2537 ieee80211_vif_release_channel(sdata);
2538 mutex_unlock(&sdata->local->mtx);
2539
2540 if (abandon)
2541 cfg80211_abandon_assoc(sdata->dev, assoc_data->bss);
2542 }
2543
2544 kfree(assoc_data);
2545 sdata->u.mgd.assoc_data = NULL;
2546 }
2547
2548 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2549 struct ieee80211_mgmt *mgmt, size_t len)
2550 {
2551 struct ieee80211_local *local = sdata->local;
2552 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2553 u8 *pos;
2554 struct ieee802_11_elems elems;
2555 u32 tx_flags = 0;
2556
2557 pos = mgmt->u.auth.variable;
2558 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2559 if (!elems.challenge)
2560 return;
2561 auth_data->expected_transaction = 4;
2562 drv_mgd_prepare_tx(sdata->local, sdata);
2563 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
2564 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2565 IEEE80211_TX_INTFL_MLME_CONN_TX;
2566 ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2567 elems.challenge - 2, elems.challenge_len + 2,
2568 auth_data->bss->bssid, auth_data->bss->bssid,
2569 auth_data->key, auth_data->key_len,
2570 auth_data->key_idx, tx_flags);
2571 }
2572
2573 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2574 struct ieee80211_mgmt *mgmt, size_t len)
2575 {
2576 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2577 u8 bssid[ETH_ALEN];
2578 u16 auth_alg, auth_transaction, status_code;
2579 struct sta_info *sta;
2580 struct ieee80211_event event = {
2581 .type = MLME_EVENT,
2582 .u.mlme.data = AUTH_EVENT,
2583 };
2584
2585 sdata_assert_lock(sdata);
2586
2587 if (len < 24 + 6)
2588 return;
2589
2590 if (!ifmgd->auth_data || ifmgd->auth_data->done)
2591 return;
2592
2593 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2594
2595 if (!ether_addr_equal(bssid, mgmt->bssid))
2596 return;
2597
2598 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2599 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2600 status_code = le16_to_cpu(mgmt->u.auth.status_code);
2601
2602 if (auth_alg != ifmgd->auth_data->algorithm ||
2603 auth_transaction != ifmgd->auth_data->expected_transaction) {
2604 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2605 mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2606 auth_transaction,
2607 ifmgd->auth_data->expected_transaction);
2608 return;
2609 }
2610
2611 if (status_code != WLAN_STATUS_SUCCESS) {
2612 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2613 mgmt->sa, status_code);
2614 ieee80211_destroy_auth_data(sdata, false);
2615 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2616 event.u.mlme.status = MLME_DENIED;
2617 event.u.mlme.reason = status_code;
2618 drv_event_callback(sdata->local, sdata, &event);
2619 return;
2620 }
2621
2622 switch (ifmgd->auth_data->algorithm) {
2623 case WLAN_AUTH_OPEN:
2624 case WLAN_AUTH_LEAP:
2625 case WLAN_AUTH_FT:
2626 case WLAN_AUTH_SAE:
2627 case WLAN_AUTH_FILS_SK:
2628 case WLAN_AUTH_FILS_SK_PFS:
2629 case WLAN_AUTH_FILS_PK:
2630 break;
2631 case WLAN_AUTH_SHARED_KEY:
2632 if (ifmgd->auth_data->expected_transaction != 4) {
2633 ieee80211_auth_challenge(sdata, mgmt, len);
2634 /* need another frame */
2635 return;
2636 }
2637 break;
2638 default:
2639 WARN_ONCE(1, "invalid auth alg %d",
2640 ifmgd->auth_data->algorithm);
2641 return;
2642 }
2643
2644 event.u.mlme.status = MLME_SUCCESS;
2645 drv_event_callback(sdata->local, sdata, &event);
2646 sdata_info(sdata, "authenticated\n");
2647 ifmgd->auth_data->done = true;
2648 ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2649 ifmgd->auth_data->timeout_started = true;
2650 run_again(sdata, ifmgd->auth_data->timeout);
2651
2652 if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2653 ifmgd->auth_data->expected_transaction != 2) {
2654 /*
2655 * Report auth frame to user space for processing since another
2656 * round of Authentication frames is still needed.
2657 */
2658 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2659 return;
2660 }
2661
2662 /* move station state to auth */
2663 mutex_lock(&sdata->local->sta_mtx);
2664 sta = sta_info_get(sdata, bssid);
2665 if (!sta) {
2666 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2667 goto out_err;
2668 }
2669 if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2670 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2671 goto out_err;
2672 }
2673 mutex_unlock(&sdata->local->sta_mtx);
2674
2675 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2676 return;
2677 out_err:
2678 mutex_unlock(&sdata->local->sta_mtx);
2679 /* ignore frame -- wait for timeout */
2680 }
2681
2682 #define case_WLAN(type) \
2683 case WLAN_REASON_##type: return #type
2684
2685 static const char *ieee80211_get_reason_code_string(u16 reason_code)
2686 {
2687 switch (reason_code) {
2688 case_WLAN(UNSPECIFIED);
2689 case_WLAN(PREV_AUTH_NOT_VALID);
2690 case_WLAN(DEAUTH_LEAVING);
2691 case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2692 case_WLAN(DISASSOC_AP_BUSY);
2693 case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2694 case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2695 case_WLAN(DISASSOC_STA_HAS_LEFT);
2696 case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2697 case_WLAN(DISASSOC_BAD_POWER);
2698 case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2699 case_WLAN(INVALID_IE);
2700 case_WLAN(MIC_FAILURE);
2701 case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2702 case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2703 case_WLAN(IE_DIFFERENT);
2704 case_WLAN(INVALID_GROUP_CIPHER);
2705 case_WLAN(INVALID_PAIRWISE_CIPHER);
2706 case_WLAN(INVALID_AKMP);
2707 case_WLAN(UNSUPP_RSN_VERSION);
2708 case_WLAN(INVALID_RSN_IE_CAP);
2709 case_WLAN(IEEE8021X_FAILED);
2710 case_WLAN(CIPHER_SUITE_REJECTED);
2711 case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2712 case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2713 case_WLAN(DISASSOC_LOW_ACK);
2714 case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2715 case_WLAN(QSTA_LEAVE_QBSS);
2716 case_WLAN(QSTA_NOT_USE);
2717 case_WLAN(QSTA_REQUIRE_SETUP);
2718 case_WLAN(QSTA_TIMEOUT);
2719 case_WLAN(QSTA_CIPHER_NOT_SUPP);
2720 case_WLAN(MESH_PEER_CANCELED);
2721 case_WLAN(MESH_MAX_PEERS);
2722 case_WLAN(MESH_CONFIG);
2723 case_WLAN(MESH_CLOSE);
2724 case_WLAN(MESH_MAX_RETRIES);
2725 case_WLAN(MESH_CONFIRM_TIMEOUT);
2726 case_WLAN(MESH_INVALID_GTK);
2727 case_WLAN(MESH_INCONSISTENT_PARAM);
2728 case_WLAN(MESH_INVALID_SECURITY);
2729 case_WLAN(MESH_PATH_ERROR);
2730 case_WLAN(MESH_PATH_NOFORWARD);
2731 case_WLAN(MESH_PATH_DEST_UNREACHABLE);
2732 case_WLAN(MAC_EXISTS_IN_MBSS);
2733 case_WLAN(MESH_CHAN_REGULATORY);
2734 case_WLAN(MESH_CHAN);
2735 default: return "<unknown>";
2736 }
2737 }
2738
2739 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2740 struct ieee80211_mgmt *mgmt, size_t len)
2741 {
2742 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2743 u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2744
2745 sdata_assert_lock(sdata);
2746
2747 if (len < 24 + 2)
2748 return;
2749
2750 if (ifmgd->associated &&
2751 ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) {
2752 const u8 *bssid = ifmgd->associated->bssid;
2753
2754 sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
2755 bssid, reason_code,
2756 ieee80211_get_reason_code_string(reason_code));
2757
2758 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2759
2760 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false,
2761 reason_code);
2762 return;
2763 }
2764
2765 if (ifmgd->assoc_data &&
2766 ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2767 const u8 *bssid = ifmgd->assoc_data->bss->bssid;
2768
2769 sdata_info(sdata,
2770 "deauthenticated from %pM while associating (Reason: %u=%s)\n",
2771 bssid, reason_code,
2772 ieee80211_get_reason_code_string(reason_code));
2773
2774 ieee80211_destroy_assoc_data(sdata, false, true);
2775
2776 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2777 return;
2778 }
2779 }
2780
2781
2782 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2783 struct ieee80211_mgmt *mgmt, size_t len)
2784 {
2785 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2786 u16 reason_code;
2787
2788 sdata_assert_lock(sdata);
2789
2790 if (len < 24 + 2)
2791 return;
2792
2793 if (!ifmgd->associated ||
2794 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2795 return;
2796
2797 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2798
2799 sdata_info(sdata, "disassociated from %pM (Reason: %u=%s)\n",
2800 mgmt->sa, reason_code,
2801 ieee80211_get_reason_code_string(reason_code));
2802
2803 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2804
2805 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code);
2806 }
2807
2808 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2809 u8 *supp_rates, unsigned int supp_rates_len,
2810 u32 *rates, u32 *basic_rates,
2811 bool *have_higher_than_11mbit,
2812 int *min_rate, int *min_rate_index,
2813 int shift)
2814 {
2815 int i, j;
2816
2817 for (i = 0; i < supp_rates_len; i++) {
2818 int rate = supp_rates[i] & 0x7f;
2819 bool is_basic = !!(supp_rates[i] & 0x80);
2820
2821 if ((rate * 5 * (1 << shift)) > 110)
2822 *have_higher_than_11mbit = true;
2823
2824 /*
2825 * Skip HT and VHT BSS membership selectors since they're not
2826 * rates.
2827 *
2828 * Note: Even though the membership selector and the basic
2829 * rate flag share the same bit, they are not exactly
2830 * the same.
2831 */
2832 if (supp_rates[i] == (0x80 | BSS_MEMBERSHIP_SELECTOR_HT_PHY) ||
2833 supp_rates[i] == (0x80 | BSS_MEMBERSHIP_SELECTOR_VHT_PHY))
2834 continue;
2835
2836 for (j = 0; j < sband->n_bitrates; j++) {
2837 struct ieee80211_rate *br;
2838 int brate;
2839
2840 br = &sband->bitrates[j];
2841
2842 brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2843 if (brate == rate) {
2844 *rates |= BIT(j);
2845 if (is_basic)
2846 *basic_rates |= BIT(j);
2847 if ((rate * 5) < *min_rate) {
2848 *min_rate = rate * 5;
2849 *min_rate_index = j;
2850 }
2851 break;
2852 }
2853 }
2854 }
2855 }
2856
2857 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2858 struct cfg80211_bss *cbss,
2859 struct ieee80211_mgmt *mgmt, size_t len)
2860 {
2861 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2862 struct ieee80211_local *local = sdata->local;
2863 struct ieee80211_supported_band *sband;
2864 struct sta_info *sta;
2865 u8 *pos;
2866 u16 capab_info, aid;
2867 struct ieee802_11_elems elems;
2868 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2869 const struct cfg80211_bss_ies *bss_ies = NULL;
2870 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2871 u32 changed = 0;
2872 int err;
2873 bool ret;
2874
2875 /* AssocResp and ReassocResp have identical structure */
2876
2877 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2878 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2879
2880 /*
2881 * The 5 MSB of the AID field are reserved
2882 * (802.11-2016 9.4.1.8 AID field)
2883 */
2884 aid &= 0x7ff;
2885
2886 ifmgd->broken_ap = false;
2887
2888 if (aid == 0 || aid > IEEE80211_MAX_AID) {
2889 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2890 aid);
2891 aid = 0;
2892 ifmgd->broken_ap = true;
2893 }
2894
2895 pos = mgmt->u.assoc_resp.variable;
2896 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2897
2898 if (!elems.supp_rates) {
2899 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2900 return false;
2901 }
2902
2903 ifmgd->aid = aid;
2904 ifmgd->tdls_chan_switch_prohibited =
2905 elems.ext_capab && elems.ext_capab_len >= 5 &&
2906 (elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
2907
2908 /*
2909 * Some APs are erroneously not including some information in their
2910 * (re)association response frames. Try to recover by using the data
2911 * from the beacon or probe response. This seems to afflict mobile
2912 * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2913 * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2914 */
2915 if ((assoc_data->wmm && !elems.wmm_param) ||
2916 (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2917 (!elems.ht_cap_elem || !elems.ht_operation)) ||
2918 (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2919 (!elems.vht_cap_elem || !elems.vht_operation))) {
2920 const struct cfg80211_bss_ies *ies;
2921 struct ieee802_11_elems bss_elems;
2922
2923 rcu_read_lock();
2924 ies = rcu_dereference(cbss->ies);
2925 if (ies)
2926 bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2927 GFP_ATOMIC);
2928 rcu_read_unlock();
2929 if (!bss_ies)
2930 return false;
2931
2932 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2933 false, &bss_elems);
2934 if (assoc_data->wmm &&
2935 !elems.wmm_param && bss_elems.wmm_param) {
2936 elems.wmm_param = bss_elems.wmm_param;
2937 sdata_info(sdata,
2938 "AP bug: WMM param missing from AssocResp\n");
2939 }
2940
2941 /*
2942 * Also check if we requested HT/VHT, otherwise the AP doesn't
2943 * have to include the IEs in the (re)association response.
2944 */
2945 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2946 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2947 elems.ht_cap_elem = bss_elems.ht_cap_elem;
2948 sdata_info(sdata,
2949 "AP bug: HT capability missing from AssocResp\n");
2950 }
2951 if (!elems.ht_operation && bss_elems.ht_operation &&
2952 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2953 elems.ht_operation = bss_elems.ht_operation;
2954 sdata_info(sdata,
2955 "AP bug: HT operation missing from AssocResp\n");
2956 }
2957 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2958 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2959 elems.vht_cap_elem = bss_elems.vht_cap_elem;
2960 sdata_info(sdata,
2961 "AP bug: VHT capa missing from AssocResp\n");
2962 }
2963 if (!elems.vht_operation && bss_elems.vht_operation &&
2964 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2965 elems.vht_operation = bss_elems.vht_operation;
2966 sdata_info(sdata,
2967 "AP bug: VHT operation missing from AssocResp\n");
2968 }
2969 }
2970
2971 /*
2972 * We previously checked these in the beacon/probe response, so
2973 * they should be present here. This is just a safety net.
2974 */
2975 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2976 (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2977 sdata_info(sdata,
2978 "HT AP is missing WMM params or HT capability/operation\n");
2979 ret = false;
2980 goto out;
2981 }
2982
2983 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2984 (!elems.vht_cap_elem || !elems.vht_operation)) {
2985 sdata_info(sdata,
2986 "VHT AP is missing VHT capability/operation\n");
2987 ret = false;
2988 goto out;
2989 }
2990
2991 mutex_lock(&sdata->local->sta_mtx);
2992 /*
2993 * station info was already allocated and inserted before
2994 * the association and should be available to us
2995 */
2996 sta = sta_info_get(sdata, cbss->bssid);
2997 if (WARN_ON(!sta)) {
2998 mutex_unlock(&sdata->local->sta_mtx);
2999 ret = false;
3000 goto out;
3001 }
3002
3003 sband = ieee80211_get_sband(sdata);
3004 if (!sband) {
3005 mutex_unlock(&sdata->local->sta_mtx);
3006 ret = false;
3007 goto out;
3008 }
3009
3010 /* Set up internal HT/VHT capabilities */
3011 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
3012 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
3013 elems.ht_cap_elem, sta);
3014
3015 if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
3016 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
3017 elems.vht_cap_elem, sta);
3018
3019 /*
3020 * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
3021 * in their association response, so ignore that data for our own
3022 * configuration. If it changed since the last beacon, we'll get the
3023 * next beacon and update then.
3024 */
3025
3026 /*
3027 * If an operating mode notification IE is present, override the
3028 * NSS calculation (that would be done in rate_control_rate_init())
3029 * and use the # of streams from that element.
3030 */
3031 if (elems.opmode_notif &&
3032 !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
3033 u8 nss;
3034
3035 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
3036 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
3037 nss += 1;
3038 sta->sta.rx_nss = nss;
3039 }
3040
3041 rate_control_rate_init(sta);
3042
3043 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) {
3044 set_sta_flag(sta, WLAN_STA_MFP);
3045 sta->sta.mfp = true;
3046 } else {
3047 sta->sta.mfp = false;
3048 }
3049
3050 sta->sta.wme = elems.wmm_param && local->hw.queues >= IEEE80211_NUM_ACS;
3051
3052 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
3053 if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
3054 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
3055 if (err) {
3056 sdata_info(sdata,
3057 "failed to move station %pM to desired state\n",
3058 sta->sta.addr);
3059 WARN_ON(__sta_info_destroy(sta));
3060 mutex_unlock(&sdata->local->sta_mtx);
3061 ret = false;
3062 goto out;
3063 }
3064
3065 mutex_unlock(&sdata->local->sta_mtx);
3066
3067 /*
3068 * Always handle WMM once after association regardless
3069 * of the first value the AP uses. Setting -1 here has
3070 * that effect because the AP values is an unsigned
3071 * 4-bit value.
3072 */
3073 ifmgd->wmm_last_param_set = -1;
3074
3075 if (ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
3076 ieee80211_set_wmm_default(sdata, false, false);
3077 } else if (!ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3078 elems.wmm_param_len)) {
3079 /* still enable QoS since we might have HT/VHT */
3080 ieee80211_set_wmm_default(sdata, false, true);
3081 /* set the disable-WMM flag in this case to disable
3082 * tracking WMM parameter changes in the beacon if
3083 * the parameters weren't actually valid. Doing so
3084 * avoids changing parameters very strangely when
3085 * the AP is going back and forth between valid and
3086 * invalid parameters.
3087 */
3088 ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
3089 }
3090 changed |= BSS_CHANGED_QOS;
3091
3092 if (elems.max_idle_period_ie) {
3093 bss_conf->max_idle_period =
3094 le16_to_cpu(elems.max_idle_period_ie->max_idle_period);
3095 bss_conf->protected_keep_alive =
3096 !!(elems.max_idle_period_ie->idle_options &
3097 WLAN_IDLE_OPTIONS_PROTECTED_KEEP_ALIVE);
3098 changed |= BSS_CHANGED_KEEP_ALIVE;
3099 } else {
3100 bss_conf->max_idle_period = 0;
3101 bss_conf->protected_keep_alive = false;
3102 }
3103
3104 /* set AID and assoc capability,
3105 * ieee80211_set_associated() will tell the driver */
3106 bss_conf->aid = aid;
3107 bss_conf->assoc_capability = capab_info;
3108 ieee80211_set_associated(sdata, cbss, changed);
3109
3110 /*
3111 * If we're using 4-addr mode, let the AP know that we're
3112 * doing so, so that it can create the STA VLAN on its side
3113 */
3114 if (ifmgd->use_4addr)
3115 ieee80211_send_4addr_nullfunc(local, sdata);
3116
3117 /*
3118 * Start timer to probe the connection to the AP now.
3119 * Also start the timer that will detect beacon loss.
3120 */
3121 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
3122 ieee80211_sta_reset_beacon_monitor(sdata);
3123
3124 ret = true;
3125 out:
3126 kfree(bss_ies);
3127 return ret;
3128 }
3129
3130 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
3131 struct ieee80211_mgmt *mgmt,
3132 size_t len)
3133 {
3134 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3135 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
3136 u16 capab_info, status_code, aid;
3137 struct ieee802_11_elems elems;
3138 int ac, uapsd_queues = -1;
3139 u8 *pos;
3140 bool reassoc;
3141 struct cfg80211_bss *bss;
3142 struct ieee80211_event event = {
3143 .type = MLME_EVENT,
3144 .u.mlme.data = ASSOC_EVENT,
3145 };
3146
3147 sdata_assert_lock(sdata);
3148
3149 if (!assoc_data)
3150 return;
3151 if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3152 return;
3153
3154 /*
3155 * AssocResp and ReassocResp have identical structure, so process both
3156 * of them in this function.
3157 */
3158
3159 if (len < 24 + 6)
3160 return;
3161
3162 reassoc = ieee80211_is_reassoc_resp(mgmt->frame_control);
3163 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
3164 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
3165 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
3166
3167 sdata_info(sdata,
3168 "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
3169 reassoc ? "Rea" : "A", mgmt->sa,
3170 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
3171
3172 if (assoc_data->fils_kek_len &&
3173 fils_decrypt_assoc_resp(sdata, (u8 *)mgmt, &len, assoc_data) < 0)
3174 return;
3175
3176 pos = mgmt->u.assoc_resp.variable;
3177 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
3178
3179 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3180 elems.timeout_int &&
3181 elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
3182 u32 tu, ms;
3183 tu = le32_to_cpu(elems.timeout_int->value);
3184 ms = tu * 1024 / 1000;
3185 sdata_info(sdata,
3186 "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
3187 mgmt->sa, tu, ms);
3188 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3189 assoc_data->timeout_started = true;
3190 if (ms > IEEE80211_ASSOC_TIMEOUT)
3191 run_again(sdata, assoc_data->timeout);
3192 return;
3193 }
3194
3195 bss = assoc_data->bss;
3196
3197 if (status_code != WLAN_STATUS_SUCCESS) {
3198 sdata_info(sdata, "%pM denied association (code=%d)\n",
3199 mgmt->sa, status_code);
3200 ieee80211_destroy_assoc_data(sdata, false, false);
3201 event.u.mlme.status = MLME_DENIED;
3202 event.u.mlme.reason = status_code;
3203 drv_event_callback(sdata->local, sdata, &event);
3204 } else {
3205 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
3206 /* oops -- internal error -- send timeout for now */
3207 ieee80211_destroy_assoc_data(sdata, false, false);
3208 cfg80211_assoc_timeout(sdata->dev, bss);
3209 return;
3210 }
3211 event.u.mlme.status = MLME_SUCCESS;
3212 drv_event_callback(sdata->local, sdata, &event);
3213 sdata_info(sdata, "associated\n");
3214
3215 /*
3216 * destroy assoc_data afterwards, as otherwise an idle
3217 * recalc after assoc_data is NULL but before associated
3218 * is set can cause the interface to go idle
3219 */
3220 ieee80211_destroy_assoc_data(sdata, true, false);
3221
3222 /* get uapsd queues configuration */
3223 uapsd_queues = 0;
3224 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
3225 if (sdata->tx_conf[ac].uapsd)
3226 uapsd_queues |= ieee80211_ac_to_qos_mask[ac];
3227 }
3228
3229 cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
3230 }
3231
3232 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
3233 struct ieee80211_mgmt *mgmt, size_t len,
3234 struct ieee80211_rx_status *rx_status,
3235 struct ieee802_11_elems *elems)
3236 {
3237 struct ieee80211_local *local = sdata->local;
3238 struct ieee80211_bss *bss;
3239 struct ieee80211_channel *channel;
3240
3241 sdata_assert_lock(sdata);
3242
3243 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
3244 if (!channel)
3245 return;
3246
3247 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3248 channel);
3249 if (bss) {
3250 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3251 ieee80211_rx_bss_put(local, bss);
3252 }
3253 }
3254
3255
3256 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
3257 struct sk_buff *skb)
3258 {
3259 struct ieee80211_mgmt *mgmt = (void *)skb->data;
3260 struct ieee80211_if_managed *ifmgd;
3261 struct ieee80211_rx_status *rx_status = (void *) skb->cb;
3262 size_t baselen, len = skb->len;
3263 struct ieee802_11_elems elems;
3264
3265 ifmgd = &sdata->u.mgd;
3266
3267 sdata_assert_lock(sdata);
3268
3269 if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3270 return; /* ignore ProbeResp to foreign address */
3271
3272 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
3273 if (baselen > len)
3274 return;
3275
3276 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3277 false, &elems);
3278
3279 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3280
3281 if (ifmgd->associated &&
3282 ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3283 ieee80211_reset_ap_probe(sdata);
3284 }
3285
3286 /*
3287 * This is the canonical list of information elements we care about,
3288 * the filter code also gives us all changes to the Microsoft OUI
3289 * (00:50:F2) vendor IE which is used for WMM which we need to track,
3290 * as well as the DTPC IE (part of the Cisco OUI) used for signaling
3291 * changes to requested client power.
3292 *
3293 * We implement beacon filtering in software since that means we can
3294 * avoid processing the frame here and in cfg80211, and userspace
3295 * will not be able to tell whether the hardware supports it or not.
3296 *
3297 * XXX: This list needs to be dynamic -- userspace needs to be able to
3298 * add items it requires. It also needs to be able to tell us to
3299 * look out for other vendor IEs.
3300 */
3301 static const u64 care_about_ies =
3302 (1ULL << WLAN_EID_COUNTRY) |
3303 (1ULL << WLAN_EID_ERP_INFO) |
3304 (1ULL << WLAN_EID_CHANNEL_SWITCH) |
3305 (1ULL << WLAN_EID_PWR_CONSTRAINT) |
3306 (1ULL << WLAN_EID_HT_CAPABILITY) |
3307 (1ULL << WLAN_EID_HT_OPERATION) |
3308 (1ULL << WLAN_EID_EXT_CHANSWITCH_ANN);
3309
3310 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
3311 struct ieee80211_mgmt *mgmt, size_t len,
3312 struct ieee80211_rx_status *rx_status)
3313 {
3314 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3315 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3316 size_t baselen;
3317 struct ieee802_11_elems elems;
3318 struct ieee80211_local *local = sdata->local;
3319 struct ieee80211_chanctx_conf *chanctx_conf;
3320 struct ieee80211_channel *chan;
3321 struct sta_info *sta;
3322 u32 changed = 0;
3323 bool erp_valid;
3324 u8 erp_value = 0;
3325 u32 ncrc;
3326 u8 *bssid;
3327 u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3328
3329 sdata_assert_lock(sdata);
3330
3331 /* Process beacon from the current BSS */
3332 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
3333 if (baselen > len)
3334 return;
3335
3336 rcu_read_lock();
3337 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3338 if (!chanctx_conf) {
3339 rcu_read_unlock();
3340 return;
3341 }
3342
3343 if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
3344 rcu_read_unlock();
3345 return;
3346 }
3347 chan = chanctx_conf->def.chan;
3348 rcu_read_unlock();
3349
3350 if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3351 ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
3352 ieee802_11_parse_elems(mgmt->u.beacon.variable,
3353 len - baselen, false, &elems);
3354
3355 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3356 if (elems.tim && !elems.parse_error) {
3357 const struct ieee80211_tim_ie *tim_ie = elems.tim;
3358 ifmgd->dtim_period = tim_ie->dtim_period;
3359 }
3360 ifmgd->have_beacon = true;
3361 ifmgd->assoc_data->need_beacon = false;
3362 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3363 sdata->vif.bss_conf.sync_tsf =
3364 le64_to_cpu(mgmt->u.beacon.timestamp);
3365 sdata->vif.bss_conf.sync_device_ts =
3366 rx_status->device_timestamp;
3367 if (elems.tim)
3368 sdata->vif.bss_conf.sync_dtim_count =
3369 elems.tim->dtim_count;
3370 else
3371 sdata->vif.bss_conf.sync_dtim_count = 0;
3372 }
3373 /* continue assoc process */
3374 ifmgd->assoc_data->timeout = jiffies;
3375 ifmgd->assoc_data->timeout_started = true;
3376 run_again(sdata, ifmgd->assoc_data->timeout);
3377 return;
3378 }
3379
3380 if (!ifmgd->associated ||
3381 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3382 return;
3383 bssid = ifmgd->associated->bssid;
3384
3385 /* Track average RSSI from the Beacon frames of the current AP */
3386 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
3387 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3388 ewma_beacon_signal_init(&ifmgd->ave_beacon_signal);
3389 ifmgd->last_cqm_event_signal = 0;
3390 ifmgd->count_beacon_signal = 1;
3391 ifmgd->last_ave_beacon_signal = 0;
3392 } else {
3393 ifmgd->count_beacon_signal++;
3394 }
3395
3396 ewma_beacon_signal_add(&ifmgd->ave_beacon_signal, -rx_status->signal);
3397
3398 if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3399 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3400 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3401 int last_sig = ifmgd->last_ave_beacon_signal;
3402 struct ieee80211_event event = {
3403 .type = RSSI_EVENT,
3404 };
3405
3406 /*
3407 * if signal crosses either of the boundaries, invoke callback
3408 * with appropriate parameters
3409 */
3410 if (sig > ifmgd->rssi_max_thold &&
3411 (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3412 ifmgd->last_ave_beacon_signal = sig;
3413 event.u.rssi.data = RSSI_EVENT_HIGH;
3414 drv_event_callback(local, sdata, &event);
3415 } else if (sig < ifmgd->rssi_min_thold &&
3416 (last_sig >= ifmgd->rssi_max_thold ||
3417 last_sig == 0)) {
3418 ifmgd->last_ave_beacon_signal = sig;
3419 event.u.rssi.data = RSSI_EVENT_LOW;
3420 drv_event_callback(local, sdata, &event);
3421 }
3422 }
3423
3424 if (bss_conf->cqm_rssi_thold &&
3425 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3426 !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3427 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3428 int last_event = ifmgd->last_cqm_event_signal;
3429 int thold = bss_conf->cqm_rssi_thold;
3430 int hyst = bss_conf->cqm_rssi_hyst;
3431
3432 if (sig < thold &&
3433 (last_event == 0 || sig < last_event - hyst)) {
3434 ifmgd->last_cqm_event_signal = sig;
3435 ieee80211_cqm_rssi_notify(
3436 &sdata->vif,
3437 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3438 sig, GFP_KERNEL);
3439 } else if (sig > thold &&
3440 (last_event == 0 || sig > last_event + hyst)) {
3441 ifmgd->last_cqm_event_signal = sig;
3442 ieee80211_cqm_rssi_notify(
3443 &sdata->vif,
3444 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3445 sig, GFP_KERNEL);
3446 }
3447 }
3448
3449 if (bss_conf->cqm_rssi_low &&
3450 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3451 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3452 int last_event = ifmgd->last_cqm_event_signal;
3453 int low = bss_conf->cqm_rssi_low;
3454 int high = bss_conf->cqm_rssi_high;
3455
3456 if (sig < low &&
3457 (last_event == 0 || last_event >= low)) {
3458 ifmgd->last_cqm_event_signal = sig;
3459 ieee80211_cqm_rssi_notify(
3460 &sdata->vif,
3461 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3462 sig, GFP_KERNEL);
3463 } else if (sig > high &&
3464 (last_event == 0 || last_event <= high)) {
3465 ifmgd->last_cqm_event_signal = sig;
3466 ieee80211_cqm_rssi_notify(
3467 &sdata->vif,
3468 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3469 sig, GFP_KERNEL);
3470 }
3471 }
3472
3473 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3474 mlme_dbg_ratelimited(sdata,
3475 "cancelling AP probe due to a received beacon\n");
3476 ieee80211_reset_ap_probe(sdata);
3477 }
3478
3479 /*
3480 * Push the beacon loss detection into the future since
3481 * we are processing a beacon from the AP just now.
3482 */
3483 ieee80211_sta_reset_beacon_monitor(sdata);
3484
3485 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3486 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3487 len - baselen, false, &elems,
3488 care_about_ies, ncrc);
3489
3490 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
3491 ieee80211_check_tim(elems.tim, elems.tim_len, ifmgd->aid)) {
3492 if (local->hw.conf.dynamic_ps_timeout > 0) {
3493 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3494 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3495 ieee80211_hw_config(local,
3496 IEEE80211_CONF_CHANGE_PS);
3497 }
3498 ieee80211_send_nullfunc(local, sdata, false);
3499 } else if (!local->pspolling && sdata->u.mgd.powersave) {
3500 local->pspolling = true;
3501
3502 /*
3503 * Here is assumed that the driver will be
3504 * able to send ps-poll frame and receive a
3505 * response even though power save mode is
3506 * enabled, but some drivers might require
3507 * to disable power save here. This needs
3508 * to be investigated.
3509 */
3510 ieee80211_send_pspoll(local, sdata);
3511 }
3512 }
3513
3514 if (sdata->vif.p2p ||
3515 sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) {
3516 struct ieee80211_p2p_noa_attr noa = {};
3517 int ret;
3518
3519 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3520 len - baselen,
3521 IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3522 (u8 *) &noa, sizeof(noa));
3523 if (ret >= 2) {
3524 if (sdata->u.mgd.p2p_noa_index != noa.index) {
3525 /* valid noa_attr and index changed */
3526 sdata->u.mgd.p2p_noa_index = noa.index;
3527 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3528 changed |= BSS_CHANGED_P2P_PS;
3529 /*
3530 * make sure we update all information, the CRC
3531 * mechanism doesn't look at P2P attributes.
3532 */
3533 ifmgd->beacon_crc_valid = false;
3534 }
3535 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3536 /* noa_attr not found and we had valid noa_attr before */
3537 sdata->u.mgd.p2p_noa_index = -1;
3538 memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3539 changed |= BSS_CHANGED_P2P_PS;
3540 ifmgd->beacon_crc_valid = false;
3541 }
3542 }
3543
3544 if (ifmgd->csa_waiting_bcn)
3545 ieee80211_chswitch_post_beacon(sdata);
3546
3547 /*
3548 * Update beacon timing and dtim count on every beacon appearance. This
3549 * will allow the driver to use the most updated values. Do it before
3550 * comparing this one with last received beacon.
3551 * IMPORTANT: These parameters would possibly be out of sync by the time
3552 * the driver will use them. The synchronized view is currently
3553 * guaranteed only in certain callbacks.
3554 */
3555 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3556 sdata->vif.bss_conf.sync_tsf =
3557 le64_to_cpu(mgmt->u.beacon.timestamp);
3558 sdata->vif.bss_conf.sync_device_ts =
3559 rx_status->device_timestamp;
3560 if (elems.tim)
3561 sdata->vif.bss_conf.sync_dtim_count =
3562 elems.tim->dtim_count;
3563 else
3564 sdata->vif.bss_conf.sync_dtim_count = 0;
3565 }
3566
3567 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3568 return;
3569 ifmgd->beacon_crc = ncrc;
3570 ifmgd->beacon_crc_valid = true;
3571
3572 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3573
3574 ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3575 rx_status->device_timestamp,
3576 &elems, true);
3577
3578 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3579 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3580 elems.wmm_param_len))
3581 changed |= BSS_CHANGED_QOS;
3582
3583 /*
3584 * If we haven't had a beacon before, tell the driver about the
3585 * DTIM period (and beacon timing if desired) now.
3586 */
3587 if (!ifmgd->have_beacon) {
3588 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3589 if (elems.tim)
3590 bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3591 else
3592 bss_conf->dtim_period = 1;
3593
3594 changed |= BSS_CHANGED_BEACON_INFO;
3595 ifmgd->have_beacon = true;
3596
3597 mutex_lock(&local->iflist_mtx);
3598 ieee80211_recalc_ps(local);
3599 mutex_unlock(&local->iflist_mtx);
3600
3601 ieee80211_recalc_ps_vif(sdata);
3602 }
3603
3604 if (elems.erp_info) {
3605 erp_valid = true;
3606 erp_value = elems.erp_info[0];
3607 } else {
3608 erp_valid = false;
3609 }
3610 changed |= ieee80211_handle_bss_capability(sdata,
3611 le16_to_cpu(mgmt->u.beacon.capab_info),
3612 erp_valid, erp_value);
3613
3614 mutex_lock(&local->sta_mtx);
3615 sta = sta_info_get(sdata, bssid);
3616
3617 if (ieee80211_config_bw(sdata, sta,
3618 elems.ht_cap_elem, elems.ht_operation,
3619 elems.vht_operation, bssid, &changed)) {
3620 mutex_unlock(&local->sta_mtx);
3621 sdata_info(sdata,
3622 "failed to follow AP %pM bandwidth change, disconnect\n",
3623 bssid);
3624 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3625 WLAN_REASON_DEAUTH_LEAVING,
3626 true, deauth_buf);
3627 ieee80211_report_disconnect(sdata, deauth_buf,
3628 sizeof(deauth_buf), true,
3629 WLAN_REASON_DEAUTH_LEAVING);
3630 return;
3631 }
3632
3633 if (sta && elems.opmode_notif)
3634 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3635 rx_status->band);
3636 mutex_unlock(&local->sta_mtx);
3637
3638 changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
3639 elems.country_elem,
3640 elems.country_elem_len,
3641 elems.pwr_constr_elem,
3642 elems.cisco_dtpc_elem);
3643
3644 ieee80211_bss_info_change_notify(sdata, changed);
3645 }
3646
3647 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3648 struct sk_buff *skb)
3649 {
3650 struct ieee80211_rx_status *rx_status;
3651 struct ieee80211_mgmt *mgmt;
3652 u16 fc;
3653 struct ieee802_11_elems elems;
3654 int ies_len;
3655
3656 rx_status = (struct ieee80211_rx_status *) skb->cb;
3657 mgmt = (struct ieee80211_mgmt *) skb->data;
3658 fc = le16_to_cpu(mgmt->frame_control);
3659
3660 sdata_lock(sdata);
3661
3662 switch (fc & IEEE80211_FCTL_STYPE) {
3663 case IEEE80211_STYPE_BEACON:
3664 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3665 break;
3666 case IEEE80211_STYPE_PROBE_RESP:
3667 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3668 break;
3669 case IEEE80211_STYPE_AUTH:
3670 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3671 break;
3672 case IEEE80211_STYPE_DEAUTH:
3673 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3674 break;
3675 case IEEE80211_STYPE_DISASSOC:
3676 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3677 break;
3678 case IEEE80211_STYPE_ASSOC_RESP:
3679 case IEEE80211_STYPE_REASSOC_RESP:
3680 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3681 break;
3682 case IEEE80211_STYPE_ACTION:
3683 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3684 ies_len = skb->len -
3685 offsetof(struct ieee80211_mgmt,
3686 u.action.u.chan_switch.variable);
3687
3688 if (ies_len < 0)
3689 break;
3690
3691 ieee802_11_parse_elems(
3692 mgmt->u.action.u.chan_switch.variable,
3693 ies_len, true, &elems);
3694
3695 if (elems.parse_error)
3696 break;
3697
3698 ieee80211_sta_process_chanswitch(sdata,
3699 rx_status->mactime,
3700 rx_status->device_timestamp,
3701 &elems, false);
3702 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3703 ies_len = skb->len -
3704 offsetof(struct ieee80211_mgmt,
3705 u.action.u.ext_chan_switch.variable);
3706
3707 if (ies_len < 0)
3708 break;
3709
3710 ieee802_11_parse_elems(
3711 mgmt->u.action.u.ext_chan_switch.variable,
3712 ies_len, true, &elems);
3713
3714 if (elems.parse_error)
3715 break;
3716
3717 /* for the handling code pretend this was also an IE */
3718 elems.ext_chansw_ie =
3719 &mgmt->u.action.u.ext_chan_switch.data;
3720
3721 ieee80211_sta_process_chanswitch(sdata,
3722 rx_status->mactime,
3723 rx_status->device_timestamp,
3724 &elems, false);
3725 }
3726 break;
3727 }
3728 sdata_unlock(sdata);
3729 }
3730
3731 static void ieee80211_sta_timer(struct timer_list *t)
3732 {
3733 struct ieee80211_sub_if_data *sdata =
3734 from_timer(sdata, t, u.mgd.timer);
3735
3736 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3737 }
3738
3739 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3740 u8 *bssid, u8 reason, bool tx)
3741 {
3742 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3743
3744 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3745 tx, frame_buf);
3746
3747 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
3748 reason);
3749 }
3750
3751 static int ieee80211_auth(struct ieee80211_sub_if_data *sdata)
3752 {
3753 struct ieee80211_local *local = sdata->local;
3754 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3755 struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3756 u32 tx_flags = 0;
3757 u16 trans = 1;
3758 u16 status = 0;
3759
3760 sdata_assert_lock(sdata);
3761
3762 if (WARN_ON_ONCE(!auth_data))
3763 return -EINVAL;
3764
3765 auth_data->tries++;
3766
3767 if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3768 sdata_info(sdata, "authentication with %pM timed out\n",
3769 auth_data->bss->bssid);
3770
3771 /*
3772 * Most likely AP is not in the range so remove the
3773 * bss struct for that AP.
3774 */
3775 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3776
3777 return -ETIMEDOUT;
3778 }
3779
3780 drv_mgd_prepare_tx(local, sdata);
3781
3782 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3783 auth_data->bss->bssid, auth_data->tries,
3784 IEEE80211_AUTH_MAX_TRIES);
3785
3786 auth_data->expected_transaction = 2;
3787
3788 if (auth_data->algorithm == WLAN_AUTH_SAE) {
3789 trans = auth_data->sae_trans;
3790 status = auth_data->sae_status;
3791 auth_data->expected_transaction = trans;
3792 }
3793
3794 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3795 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3796 IEEE80211_TX_INTFL_MLME_CONN_TX;
3797
3798 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3799 auth_data->data, auth_data->data_len,
3800 auth_data->bss->bssid,
3801 auth_data->bss->bssid, NULL, 0, 0,
3802 tx_flags);
3803
3804 if (tx_flags == 0) {
3805 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3806 auth_data->timeout_started = true;
3807 run_again(sdata, auth_data->timeout);
3808 } else {
3809 auth_data->timeout =
3810 round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3811 auth_data->timeout_started = true;
3812 run_again(sdata, auth_data->timeout);
3813 }
3814
3815 return 0;
3816 }
3817
3818 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3819 {
3820 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3821 struct ieee80211_local *local = sdata->local;
3822
3823 sdata_assert_lock(sdata);
3824
3825 assoc_data->tries++;
3826 if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3827 sdata_info(sdata, "association with %pM timed out\n",
3828 assoc_data->bss->bssid);
3829
3830 /*
3831 * Most likely AP is not in the range so remove the
3832 * bss struct for that AP.
3833 */
3834 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3835
3836 return -ETIMEDOUT;
3837 }
3838
3839 sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3840 assoc_data->bss->bssid, assoc_data->tries,
3841 IEEE80211_ASSOC_MAX_TRIES);
3842 ieee80211_send_assoc(sdata);
3843
3844 if (!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3845 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3846 assoc_data->timeout_started = true;
3847 run_again(sdata, assoc_data->timeout);
3848 } else {
3849 assoc_data->timeout =
3850 round_jiffies_up(jiffies +
3851 IEEE80211_ASSOC_TIMEOUT_LONG);
3852 assoc_data->timeout_started = true;
3853 run_again(sdata, assoc_data->timeout);
3854 }
3855
3856 return 0;
3857 }
3858
3859 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3860 __le16 fc, bool acked)
3861 {
3862 struct ieee80211_local *local = sdata->local;
3863
3864 sdata->u.mgd.status_fc = fc;
3865 sdata->u.mgd.status_acked = acked;
3866 sdata->u.mgd.status_received = true;
3867
3868 ieee80211_queue_work(&local->hw, &sdata->work);
3869 }
3870
3871 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3872 {
3873 struct ieee80211_local *local = sdata->local;
3874 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3875
3876 sdata_lock(sdata);
3877
3878 if (ifmgd->status_received) {
3879 __le16 fc = ifmgd->status_fc;
3880 bool status_acked = ifmgd->status_acked;
3881
3882 ifmgd->status_received = false;
3883 if (ifmgd->auth_data && ieee80211_is_auth(fc)) {
3884 if (status_acked) {
3885 ifmgd->auth_data->timeout =
3886 jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3887 run_again(sdata, ifmgd->auth_data->timeout);
3888 } else {
3889 ifmgd->auth_data->timeout = jiffies - 1;
3890 }
3891 ifmgd->auth_data->timeout_started = true;
3892 } else if (ifmgd->assoc_data &&
3893 (ieee80211_is_assoc_req(fc) ||
3894 ieee80211_is_reassoc_req(fc))) {
3895 if (status_acked) {
3896 ifmgd->assoc_data->timeout =
3897 jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3898 run_again(sdata, ifmgd->assoc_data->timeout);
3899 } else {
3900 ifmgd->assoc_data->timeout = jiffies - 1;
3901 }
3902 ifmgd->assoc_data->timeout_started = true;
3903 }
3904 }
3905
3906 if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3907 time_after(jiffies, ifmgd->auth_data->timeout)) {
3908 if (ifmgd->auth_data->done) {
3909 /*
3910 * ok ... we waited for assoc but userspace didn't,
3911 * so let's just kill the auth data
3912 */
3913 ieee80211_destroy_auth_data(sdata, false);
3914 } else if (ieee80211_auth(sdata)) {
3915 u8 bssid[ETH_ALEN];
3916 struct ieee80211_event event = {
3917 .type = MLME_EVENT,
3918 .u.mlme.data = AUTH_EVENT,
3919 .u.mlme.status = MLME_TIMEOUT,
3920 };
3921
3922 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3923
3924 ieee80211_destroy_auth_data(sdata, false);
3925
3926 cfg80211_auth_timeout(sdata->dev, bssid);
3927 drv_event_callback(sdata->local, sdata, &event);
3928 }
3929 } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3930 run_again(sdata, ifmgd->auth_data->timeout);
3931
3932 if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3933 time_after(jiffies, ifmgd->assoc_data->timeout)) {
3934 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3935 ieee80211_do_assoc(sdata)) {
3936 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3937 struct ieee80211_event event = {
3938 .type = MLME_EVENT,
3939 .u.mlme.data = ASSOC_EVENT,
3940 .u.mlme.status = MLME_TIMEOUT,
3941 };
3942
3943 ieee80211_destroy_assoc_data(sdata, false, false);
3944 cfg80211_assoc_timeout(sdata->dev, bss);
3945 drv_event_callback(sdata->local, sdata, &event);
3946 }
3947 } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3948 run_again(sdata, ifmgd->assoc_data->timeout);
3949
3950 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3951 ifmgd->associated) {
3952 u8 bssid[ETH_ALEN];
3953 int max_tries;
3954
3955 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3956
3957 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3958 max_tries = max_nullfunc_tries;
3959 else
3960 max_tries = max_probe_tries;
3961
3962 /* ACK received for nullfunc probing frame */
3963 if (!ifmgd->probe_send_count)
3964 ieee80211_reset_ap_probe(sdata);
3965 else if (ifmgd->nullfunc_failed) {
3966 if (ifmgd->probe_send_count < max_tries) {
3967 mlme_dbg(sdata,
3968 "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3969 bssid, ifmgd->probe_send_count,
3970 max_tries);
3971 ieee80211_mgd_probe_ap_send(sdata);
3972 } else {
3973 mlme_dbg(sdata,
3974 "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3975 bssid);
3976 ieee80211_sta_connection_lost(sdata, bssid,
3977 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3978 false);
3979 }
3980 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3981 run_again(sdata, ifmgd->probe_timeout);
3982 else if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3983 mlme_dbg(sdata,
3984 "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3985 bssid, probe_wait_ms);
3986 ieee80211_sta_connection_lost(sdata, bssid,
3987 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3988 } else if (ifmgd->probe_send_count < max_tries) {
3989 mlme_dbg(sdata,
3990 "No probe response from AP %pM after %dms, try %d/%i\n",
3991 bssid, probe_wait_ms,
3992 ifmgd->probe_send_count, max_tries);
3993 ieee80211_mgd_probe_ap_send(sdata);
3994 } else {
3995 /*
3996 * We actually lost the connection ... or did we?
3997 * Let's make sure!
3998 */
3999 mlme_dbg(sdata,
4000 "No probe response from AP %pM after %dms, disconnecting.\n",
4001 bssid, probe_wait_ms);
4002
4003 ieee80211_sta_connection_lost(sdata, bssid,
4004 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
4005 }
4006 }
4007
4008 sdata_unlock(sdata);
4009 }
4010
4011 static void ieee80211_sta_bcn_mon_timer(struct timer_list *t)
4012 {
4013 struct ieee80211_sub_if_data *sdata =
4014 from_timer(sdata, t, u.mgd.bcn_mon_timer);
4015 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4016
4017 if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
4018 return;
4019
4020 sdata->u.mgd.connection_loss = false;
4021 ieee80211_queue_work(&sdata->local->hw,
4022 &sdata->u.mgd.beacon_connection_loss_work);
4023 }
4024
4025 static void ieee80211_sta_conn_mon_timer(struct timer_list *t)
4026 {
4027 struct ieee80211_sub_if_data *sdata =
4028 from_timer(sdata, t, u.mgd.conn_mon_timer);
4029 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4030 struct ieee80211_local *local = sdata->local;
4031
4032 if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
4033 return;
4034
4035 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
4036 }
4037
4038 static void ieee80211_sta_monitor_work(struct work_struct *work)
4039 {
4040 struct ieee80211_sub_if_data *sdata =
4041 container_of(work, struct ieee80211_sub_if_data,
4042 u.mgd.monitor_work);
4043
4044 ieee80211_mgd_probe_ap(sdata, false);
4045 }
4046
4047 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
4048 {
4049 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
4050 __ieee80211_stop_poll(sdata);
4051
4052 /* let's probe the connection once */
4053 if (!ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
4054 ieee80211_queue_work(&sdata->local->hw,
4055 &sdata->u.mgd.monitor_work);
4056 }
4057 }
4058
4059 #ifdef CONFIG_PM
4060 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
4061 {
4062 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4063 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4064
4065 sdata_lock(sdata);
4066
4067 if (ifmgd->auth_data || ifmgd->assoc_data) {
4068 const u8 *bssid = ifmgd->auth_data ?
4069 ifmgd->auth_data->bss->bssid :
4070 ifmgd->assoc_data->bss->bssid;
4071
4072 /*
4073 * If we are trying to authenticate / associate while suspending,
4074 * cfg80211 won't know and won't actually abort those attempts,
4075 * thus we need to do that ourselves.
4076 */
4077 ieee80211_send_deauth_disassoc(sdata, bssid,
4078 IEEE80211_STYPE_DEAUTH,
4079 WLAN_REASON_DEAUTH_LEAVING,
4080 false, frame_buf);
4081 if (ifmgd->assoc_data)
4082 ieee80211_destroy_assoc_data(sdata, false, true);
4083 if (ifmgd->auth_data)
4084 ieee80211_destroy_auth_data(sdata, false);
4085 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4086 IEEE80211_DEAUTH_FRAME_LEN);
4087 }
4088
4089 /* This is a bit of a hack - we should find a better and more generic
4090 * solution to this. Normally when suspending, cfg80211 will in fact
4091 * deauthenticate. However, it doesn't (and cannot) stop an ongoing
4092 * auth (not so important) or assoc (this is the problem) process.
4093 *
4094 * As a consequence, it can happen that we are in the process of both
4095 * associating and suspending, and receive an association response
4096 * after cfg80211 has checked if it needs to disconnect, but before
4097 * we actually set the flag to drop incoming frames. This will then
4098 * cause the workqueue flush to process the association response in
4099 * the suspend, resulting in a successful association just before it
4100 * tries to remove the interface from the driver, which now though
4101 * has a channel context assigned ... this results in issues.
4102 *
4103 * To work around this (for now) simply deauth here again if we're
4104 * now connected.
4105 */
4106 if (ifmgd->associated && !sdata->local->wowlan) {
4107 u8 bssid[ETH_ALEN];
4108 struct cfg80211_deauth_request req = {
4109 .reason_code = WLAN_REASON_DEAUTH_LEAVING,
4110 .bssid = bssid,
4111 };
4112
4113 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
4114 ieee80211_mgd_deauth(sdata, &req);
4115 }
4116
4117 sdata_unlock(sdata);
4118 }
4119
4120 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
4121 {
4122 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4123
4124 sdata_lock(sdata);
4125 if (!ifmgd->associated) {
4126 sdata_unlock(sdata);
4127 return;
4128 }
4129
4130 if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
4131 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
4132 mlme_dbg(sdata, "driver requested disconnect after resume\n");
4133 ieee80211_sta_connection_lost(sdata,
4134 ifmgd->associated->bssid,
4135 WLAN_REASON_UNSPECIFIED,
4136 true);
4137 sdata_unlock(sdata);
4138 return;
4139 }
4140 sdata_unlock(sdata);
4141 }
4142 #endif
4143
4144 /* interface setup */
4145 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
4146 {
4147 struct ieee80211_if_managed *ifmgd;
4148
4149 ifmgd = &sdata->u.mgd;
4150 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
4151 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
4152 INIT_WORK(&ifmgd->beacon_connection_loss_work,
4153 ieee80211_beacon_connection_loss_work);
4154 INIT_WORK(&ifmgd->csa_connection_drop_work,
4155 ieee80211_csa_connection_drop_work);
4156 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
4157 INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
4158 ieee80211_tdls_peer_del_work);
4159 timer_setup(&ifmgd->timer, ieee80211_sta_timer, 0);
4160 timer_setup(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer, 0);
4161 timer_setup(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer, 0);
4162 timer_setup(&ifmgd->chswitch_timer, ieee80211_chswitch_timer, 0);
4163 INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
4164 ieee80211_sta_handle_tspec_ac_params_wk);
4165
4166 ifmgd->flags = 0;
4167 ifmgd->powersave = sdata->wdev.ps;
4168 ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
4169 ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
4170 ifmgd->p2p_noa_index = -1;
4171
4172 if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4173 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
4174 else
4175 ifmgd->req_smps = IEEE80211_SMPS_OFF;
4176
4177 /* Setup TDLS data */
4178 spin_lock_init(&ifmgd->teardown_lock);
4179 ifmgd->teardown_skb = NULL;
4180 ifmgd->orig_teardown_skb = NULL;
4181 }
4182
4183 /* scan finished notification */
4184 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
4185 {
4186 struct ieee80211_sub_if_data *sdata;
4187
4188 /* Restart STA timers */
4189 rcu_read_lock();
4190 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4191 if (ieee80211_sdata_running(sdata))
4192 ieee80211_restart_sta_timer(sdata);
4193 }
4194 rcu_read_unlock();
4195 }
4196
4197 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
4198 struct cfg80211_bss *cbss)
4199 {
4200 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4201 const u8 *ht_cap_ie, *vht_cap_ie;
4202 const struct ieee80211_ht_cap *ht_cap;
4203 const struct ieee80211_vht_cap *vht_cap;
4204 u8 chains = 1;
4205
4206 if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
4207 return chains;
4208
4209 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4210 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
4211 ht_cap = (void *)(ht_cap_ie + 2);
4212 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
4213 /*
4214 * TODO: use "Tx Maximum Number Spatial Streams Supported" and
4215 * "Tx Unequal Modulation Supported" fields.
4216 */
4217 }
4218
4219 if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
4220 return chains;
4221
4222 vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4223 if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
4224 u8 nss;
4225 u16 tx_mcs_map;
4226
4227 vht_cap = (void *)(vht_cap_ie + 2);
4228 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
4229 for (nss = 8; nss > 0; nss--) {
4230 if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
4231 IEEE80211_VHT_MCS_NOT_SUPPORTED)
4232 break;
4233 }
4234 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
4235 chains = max(chains, nss);
4236 }
4237
4238 return chains;
4239 }
4240
4241 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
4242 struct cfg80211_bss *cbss)
4243 {
4244 struct ieee80211_local *local = sdata->local;
4245 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4246 const struct ieee80211_ht_cap *ht_cap = NULL;
4247 const struct ieee80211_ht_operation *ht_oper = NULL;
4248 const struct ieee80211_vht_operation *vht_oper = NULL;
4249 struct ieee80211_supported_band *sband;
4250 struct cfg80211_chan_def chandef;
4251 int ret;
4252 u32 i;
4253 bool have_80mhz;
4254
4255 sband = local->hw.wiphy->bands[cbss->channel->band];
4256
4257 ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
4258 IEEE80211_STA_DISABLE_80P80MHZ |
4259 IEEE80211_STA_DISABLE_160MHZ);
4260
4261 rcu_read_lock();
4262
4263 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
4264 sband->ht_cap.ht_supported) {
4265 const u8 *ht_oper_ie, *ht_cap_ie;
4266
4267 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4268 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
4269 ht_oper = (void *)(ht_oper_ie + 2);
4270
4271 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4272 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
4273 ht_cap = (void *)(ht_cap_ie + 2);
4274
4275 if (!ht_cap) {
4276 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4277 ht_oper = NULL;
4278 }
4279 }
4280
4281 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4282 sband->vht_cap.vht_supported) {
4283 const u8 *vht_oper_ie, *vht_cap;
4284
4285 vht_oper_ie = ieee80211_bss_get_ie(cbss,
4286 WLAN_EID_VHT_OPERATION);
4287 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
4288 vht_oper = (void *)(vht_oper_ie + 2);
4289 if (vht_oper && !ht_oper) {
4290 vht_oper = NULL;
4291 sdata_info(sdata,
4292 "AP advertised VHT without HT, disabling both\n");
4293 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4294 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4295 }
4296
4297 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4298 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
4299 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4300 vht_oper = NULL;
4301 }
4302 }
4303
4304 /* Allow VHT if at least one channel on the sband supports 80 MHz */
4305 have_80mhz = false;
4306 for (i = 0; i < sband->n_channels; i++) {
4307 if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
4308 IEEE80211_CHAN_NO_80MHZ))
4309 continue;
4310
4311 have_80mhz = true;
4312 break;
4313 }
4314
4315 if (!have_80mhz)
4316 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4317
4318 ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
4319 cbss->channel,
4320 ht_oper, vht_oper,
4321 &chandef, false);
4322
4323 sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
4324 local->rx_chains);
4325
4326 rcu_read_unlock();
4327
4328 /* will change later if needed */
4329 sdata->smps_mode = IEEE80211_SMPS_OFF;
4330
4331 mutex_lock(&local->mtx);
4332 /*
4333 * If this fails (possibly due to channel context sharing
4334 * on incompatible channels, e.g. 80+80 and 160 sharing the
4335 * same control channel) try to use a smaller bandwidth.
4336 */
4337 ret = ieee80211_vif_use_channel(sdata, &chandef,
4338 IEEE80211_CHANCTX_SHARED);
4339
4340 /* don't downgrade for 5 and 10 MHz channels, though. */
4341 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
4342 chandef.width == NL80211_CHAN_WIDTH_10)
4343 goto out;
4344
4345 while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4346 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4347 ret = ieee80211_vif_use_channel(sdata, &chandef,
4348 IEEE80211_CHANCTX_SHARED);
4349 }
4350 out:
4351 mutex_unlock(&local->mtx);
4352 return ret;
4353 }
4354
4355 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4356 struct cfg80211_bss *cbss, bool assoc,
4357 bool override)
4358 {
4359 struct ieee80211_local *local = sdata->local;
4360 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4361 struct ieee80211_bss *bss = (void *)cbss->priv;
4362 struct sta_info *new_sta = NULL;
4363 struct ieee80211_supported_band *sband;
4364 bool have_sta = false;
4365 int err;
4366
4367 sband = local->hw.wiphy->bands[cbss->channel->band];
4368
4369 if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
4370 return -EINVAL;
4371
4372 /* If a reconfig is happening, bail out */
4373 if (local->in_reconfig)
4374 return -EBUSY;
4375
4376 if (assoc) {
4377 rcu_read_lock();
4378 have_sta = sta_info_get(sdata, cbss->bssid);
4379 rcu_read_unlock();
4380 }
4381
4382 if (!have_sta) {
4383 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
4384 if (!new_sta)
4385 return -ENOMEM;
4386 }
4387
4388 /*
4389 * Set up the information for the new channel before setting the
4390 * new channel. We can't - completely race-free - change the basic
4391 * rates bitmap and the channel (sband) that it refers to, but if
4392 * we set it up before we at least avoid calling into the driver's
4393 * bss_info_changed() method with invalid information (since we do
4394 * call that from changing the channel - only for IDLE and perhaps
4395 * some others, but ...).
4396 *
4397 * So to avoid that, just set up all the new information before the
4398 * channel, but tell the driver to apply it only afterwards, since
4399 * it might need the new channel for that.
4400 */
4401 if (new_sta) {
4402 u32 rates = 0, basic_rates = 0;
4403 bool have_higher_than_11mbit;
4404 int min_rate = INT_MAX, min_rate_index = -1;
4405 const struct cfg80211_bss_ies *ies;
4406 int shift = ieee80211_vif_get_shift(&sdata->vif);
4407
4408 ieee80211_get_rates(sband, bss->supp_rates,
4409 bss->supp_rates_len,
4410 &rates, &basic_rates,
4411 &have_higher_than_11mbit,
4412 &min_rate, &min_rate_index,
4413 shift);
4414
4415 /*
4416 * This used to be a workaround for basic rates missing
4417 * in the association response frame. Now that we no
4418 * longer use the basic rates from there, it probably
4419 * doesn't happen any more, but keep the workaround so
4420 * in case some *other* APs are buggy in different ways
4421 * we can connect -- with a warning.
4422 */
4423 if (!basic_rates && min_rate_index >= 0) {
4424 sdata_info(sdata,
4425 "No basic rates, using min rate instead\n");
4426 basic_rates = BIT(min_rate_index);
4427 }
4428
4429 new_sta->sta.supp_rates[cbss->channel->band] = rates;
4430 sdata->vif.bss_conf.basic_rates = basic_rates;
4431
4432 /* cf. IEEE 802.11 9.2.12 */
4433 if (cbss->channel->band == NL80211_BAND_2GHZ &&
4434 have_higher_than_11mbit)
4435 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
4436 else
4437 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
4438
4439 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
4440
4441 /* set timing information */
4442 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
4443 rcu_read_lock();
4444 ies = rcu_dereference(cbss->beacon_ies);
4445 if (ies) {
4446 const u8 *tim_ie;
4447
4448 sdata->vif.bss_conf.sync_tsf = ies->tsf;
4449 sdata->vif.bss_conf.sync_device_ts =
4450 bss->device_ts_beacon;
4451 tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4452 ies->data, ies->len);
4453 if (tim_ie && tim_ie[1] >= 2)
4454 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
4455 else
4456 sdata->vif.bss_conf.sync_dtim_count = 0;
4457 } else if (!ieee80211_hw_check(&sdata->local->hw,
4458 TIMING_BEACON_ONLY)) {
4459 ies = rcu_dereference(cbss->proberesp_ies);
4460 /* must be non-NULL since beacon IEs were NULL */
4461 sdata->vif.bss_conf.sync_tsf = ies->tsf;
4462 sdata->vif.bss_conf.sync_device_ts =
4463 bss->device_ts_presp;
4464 sdata->vif.bss_conf.sync_dtim_count = 0;
4465 } else {
4466 sdata->vif.bss_conf.sync_tsf = 0;
4467 sdata->vif.bss_conf.sync_device_ts = 0;
4468 sdata->vif.bss_conf.sync_dtim_count = 0;
4469 }
4470 rcu_read_unlock();
4471 }
4472
4473 if (new_sta || override) {
4474 err = ieee80211_prep_channel(sdata, cbss);
4475 if (err) {
4476 if (new_sta)
4477 sta_info_free(local, new_sta);
4478 return -EINVAL;
4479 }
4480 }
4481
4482 if (new_sta) {
4483 /*
4484 * tell driver about BSSID, basic rates and timing
4485 * this was set up above, before setting the channel
4486 */
4487 ieee80211_bss_info_change_notify(sdata,
4488 BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4489 BSS_CHANGED_BEACON_INT);
4490
4491 if (assoc)
4492 sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4493
4494 err = sta_info_insert(new_sta);
4495 new_sta = NULL;
4496 if (err) {
4497 sdata_info(sdata,
4498 "failed to insert STA entry for the AP (error %d)\n",
4499 err);
4500 return err;
4501 }
4502 } else
4503 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4504
4505 /* Cancel scan to ensure that nothing interferes with connection */
4506 if (local->scanning)
4507 ieee80211_scan_cancel(local);
4508
4509 return 0;
4510 }
4511
4512 /* config hooks */
4513 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4514 struct cfg80211_auth_request *req)
4515 {
4516 struct ieee80211_local *local = sdata->local;
4517 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4518 struct ieee80211_mgd_auth_data *auth_data;
4519 u16 auth_alg;
4520 int err;
4521
4522 /* prepare auth data structure */
4523
4524 switch (req->auth_type) {
4525 case NL80211_AUTHTYPE_OPEN_SYSTEM:
4526 auth_alg = WLAN_AUTH_OPEN;
4527 break;
4528 case NL80211_AUTHTYPE_SHARED_KEY:
4529 if (IS_ERR(local->wep_tx_tfm))
4530 return -EOPNOTSUPP;
4531 auth_alg = WLAN_AUTH_SHARED_KEY;
4532 break;
4533 case NL80211_AUTHTYPE_FT:
4534 auth_alg = WLAN_AUTH_FT;
4535 break;
4536 case NL80211_AUTHTYPE_NETWORK_EAP:
4537 auth_alg = WLAN_AUTH_LEAP;
4538 break;
4539 case NL80211_AUTHTYPE_SAE:
4540 auth_alg = WLAN_AUTH_SAE;
4541 break;
4542 case NL80211_AUTHTYPE_FILS_SK:
4543 auth_alg = WLAN_AUTH_FILS_SK;
4544 break;
4545 case NL80211_AUTHTYPE_FILS_SK_PFS:
4546 auth_alg = WLAN_AUTH_FILS_SK_PFS;
4547 break;
4548 case NL80211_AUTHTYPE_FILS_PK:
4549 auth_alg = WLAN_AUTH_FILS_PK;
4550 break;
4551 default:
4552 return -EOPNOTSUPP;
4553 }
4554
4555 auth_data = kzalloc(sizeof(*auth_data) + req->auth_data_len +
4556 req->ie_len, GFP_KERNEL);
4557 if (!auth_data)
4558 return -ENOMEM;
4559
4560 auth_data->bss = req->bss;
4561
4562 if (req->auth_data_len >= 4) {
4563 if (req->auth_type == NL80211_AUTHTYPE_SAE) {
4564 __le16 *pos = (__le16 *) req->auth_data;
4565
4566 auth_data->sae_trans = le16_to_cpu(pos[0]);
4567 auth_data->sae_status = le16_to_cpu(pos[1]);
4568 }
4569 memcpy(auth_data->data, req->auth_data + 4,
4570 req->auth_data_len - 4);
4571 auth_data->data_len += req->auth_data_len - 4;
4572 }
4573
4574 if (req->ie && req->ie_len) {
4575 memcpy(&auth_data->data[auth_data->data_len],
4576 req->ie, req->ie_len);
4577 auth_data->data_len += req->ie_len;
4578 }
4579
4580 if (req->key && req->key_len) {
4581 auth_data->key_len = req->key_len;
4582 auth_data->key_idx = req->key_idx;
4583 memcpy(auth_data->key, req->key, req->key_len);
4584 }
4585
4586 auth_data->algorithm = auth_alg;
4587
4588 /* try to authenticate/probe */
4589
4590 if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4591 ifmgd->assoc_data) {
4592 err = -EBUSY;
4593 goto err_free;
4594 }
4595
4596 if (ifmgd->auth_data)
4597 ieee80211_destroy_auth_data(sdata, false);
4598
4599 /* prep auth_data so we don't go into idle on disassoc */
4600 ifmgd->auth_data = auth_data;
4601
4602 if (ifmgd->associated) {
4603 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4604
4605 sdata_info(sdata,
4606 "disconnect from AP %pM for new auth to %pM\n",
4607 ifmgd->associated->bssid, req->bss->bssid);
4608 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4609 WLAN_REASON_UNSPECIFIED,
4610 false, frame_buf);
4611
4612 ieee80211_report_disconnect(sdata, frame_buf,
4613 sizeof(frame_buf), true,
4614 WLAN_REASON_UNSPECIFIED);
4615 }
4616
4617 sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4618
4619 err = ieee80211_prep_connection(sdata, req->bss, false, false);
4620 if (err)
4621 goto err_clear;
4622
4623 err = ieee80211_auth(sdata);
4624 if (err) {
4625 sta_info_destroy_addr(sdata, req->bss->bssid);
4626 goto err_clear;
4627 }
4628
4629 /* hold our own reference */
4630 cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4631 return 0;
4632
4633 err_clear:
4634 eth_zero_addr(ifmgd->bssid);
4635 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4636 ifmgd->auth_data = NULL;
4637 mutex_lock(&sdata->local->mtx);
4638 ieee80211_vif_release_channel(sdata);
4639 mutex_unlock(&sdata->local->mtx);
4640 err_free:
4641 kfree(auth_data);
4642 return err;
4643 }
4644
4645 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4646 struct cfg80211_assoc_request *req)
4647 {
4648 struct ieee80211_local *local = sdata->local;
4649 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4650 struct ieee80211_bss *bss = (void *)req->bss->priv;
4651 struct ieee80211_mgd_assoc_data *assoc_data;
4652 const struct cfg80211_bss_ies *beacon_ies;
4653 struct ieee80211_supported_band *sband;
4654 const u8 *ssidie, *ht_ie, *vht_ie;
4655 int i, err;
4656 bool override = false;
4657
4658 assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4659 if (!assoc_data)
4660 return -ENOMEM;
4661
4662 rcu_read_lock();
4663 ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4664 if (!ssidie) {
4665 rcu_read_unlock();
4666 kfree(assoc_data);
4667 return -EINVAL;
4668 }
4669 memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4670 assoc_data->ssid_len = ssidie[1];
4671 rcu_read_unlock();
4672
4673 if (ifmgd->associated) {
4674 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4675
4676 sdata_info(sdata,
4677 "disconnect from AP %pM for new assoc to %pM\n",
4678 ifmgd->associated->bssid, req->bss->bssid);
4679 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4680 WLAN_REASON_UNSPECIFIED,
4681 false, frame_buf);
4682
4683 ieee80211_report_disconnect(sdata, frame_buf,
4684 sizeof(frame_buf), true,
4685 WLAN_REASON_UNSPECIFIED);
4686 }
4687
4688 if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4689 err = -EBUSY;
4690 goto err_free;
4691 }
4692
4693 if (ifmgd->assoc_data) {
4694 err = -EBUSY;
4695 goto err_free;
4696 }
4697
4698 if (ifmgd->auth_data) {
4699 bool match;
4700
4701 /* keep sta info, bssid if matching */
4702 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4703 ieee80211_destroy_auth_data(sdata, match);
4704 }
4705
4706 /* prepare assoc data */
4707
4708 ifmgd->beacon_crc_valid = false;
4709
4710 assoc_data->wmm = bss->wmm_used &&
4711 (local->hw.queues >= IEEE80211_NUM_ACS);
4712
4713 /*
4714 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4715 * We still associate in non-HT mode (11a/b/g) if any one of these
4716 * ciphers is configured as pairwise.
4717 * We can set this to true for non-11n hardware, that'll be checked
4718 * separately along with the peer capabilities.
4719 */
4720 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4721 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4722 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4723 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4724 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4725 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4726 netdev_info(sdata->dev,
4727 "disabling HT/VHT due to WEP/TKIP use\n");
4728 }
4729 }
4730
4731 /* Also disable HT if we don't support it or the AP doesn't use WMM */
4732 sband = local->hw.wiphy->bands[req->bss->channel->band];
4733 if (!sband->ht_cap.ht_supported ||
4734 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4735 ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4736 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4737 if (!bss->wmm_used &&
4738 !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4739 netdev_info(sdata->dev,
4740 "disabling HT as WMM/QoS is not supported by the AP\n");
4741 }
4742
4743 /* disable VHT if we don't support it or the AP doesn't use WMM */
4744 if (!sband->vht_cap.vht_supported ||
4745 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4746 ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4747 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4748 if (!bss->wmm_used &&
4749 !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4750 netdev_info(sdata->dev,
4751 "disabling VHT as WMM/QoS is not supported by the AP\n");
4752 }
4753
4754 memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4755 memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4756 sizeof(ifmgd->ht_capa_mask));
4757
4758 memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4759 memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4760 sizeof(ifmgd->vht_capa_mask));
4761
4762 if (req->ie && req->ie_len) {
4763 memcpy(assoc_data->ie, req->ie, req->ie_len);
4764 assoc_data->ie_len = req->ie_len;
4765 }
4766
4767 if (req->fils_kek) {
4768 /* should already be checked in cfg80211 - so warn */
4769 if (WARN_ON(req->fils_kek_len > FILS_MAX_KEK_LEN)) {
4770 err = -EINVAL;
4771 goto err_free;
4772 }
4773 memcpy(assoc_data->fils_kek, req->fils_kek,
4774 req->fils_kek_len);
4775 assoc_data->fils_kek_len = req->fils_kek_len;
4776 }
4777
4778 if (req->fils_nonces)
4779 memcpy(assoc_data->fils_nonces, req->fils_nonces,
4780 2 * FILS_NONCE_LEN);
4781
4782 assoc_data->bss = req->bss;
4783
4784 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4785 if (ifmgd->powersave)
4786 sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4787 else
4788 sdata->smps_mode = IEEE80211_SMPS_OFF;
4789 } else
4790 sdata->smps_mode = ifmgd->req_smps;
4791
4792 assoc_data->capability = req->bss->capability;
4793 assoc_data->supp_rates = bss->supp_rates;
4794 assoc_data->supp_rates_len = bss->supp_rates_len;
4795
4796 rcu_read_lock();
4797 ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4798 if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4799 assoc_data->ap_ht_param =
4800 ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4801 else
4802 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4803 vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4804 if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4805 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4806 sizeof(struct ieee80211_vht_cap));
4807 else
4808 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4809 rcu_read_unlock();
4810
4811 if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) &&
4812 ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK),
4813 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"))
4814 sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;
4815
4816 if (bss->wmm_used && bss->uapsd_supported &&
4817 (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) {
4818 assoc_data->uapsd = true;
4819 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4820 } else {
4821 assoc_data->uapsd = false;
4822 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4823 }
4824
4825 if (req->prev_bssid)
4826 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4827
4828 if (req->use_mfp) {
4829 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4830 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4831 } else {
4832 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4833 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4834 }
4835
4836 if (req->flags & ASSOC_REQ_USE_RRM)
4837 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
4838 else
4839 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;
4840
4841 if (req->crypto.control_port)
4842 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4843 else
4844 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4845
4846 sdata->control_port_protocol = req->crypto.control_port_ethertype;
4847 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4848 sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4849 sdata->vif.type);
4850
4851 /* kick off associate process */
4852
4853 ifmgd->assoc_data = assoc_data;
4854 ifmgd->dtim_period = 0;
4855 ifmgd->have_beacon = false;
4856
4857 /* override HT/VHT configuration only if the AP and we support it */
4858 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
4859 struct ieee80211_sta_ht_cap sta_ht_cap;
4860
4861 if (req->flags & ASSOC_REQ_DISABLE_HT)
4862 override = true;
4863
4864 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
4865 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
4866
4867 /* check for 40 MHz disable override */
4868 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ) &&
4869 sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
4870 !(sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
4871 override = true;
4872
4873 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4874 req->flags & ASSOC_REQ_DISABLE_VHT)
4875 override = true;
4876 }
4877
4878 if (req->flags & ASSOC_REQ_DISABLE_HT) {
4879 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4880 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4881 }
4882
4883 if (req->flags & ASSOC_REQ_DISABLE_VHT)
4884 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4885
4886 err = ieee80211_prep_connection(sdata, req->bss, true, override);
4887 if (err)
4888 goto err_clear;
4889
4890 rcu_read_lock();
4891 beacon_ies = rcu_dereference(req->bss->beacon_ies);
4892
4893 if (ieee80211_hw_check(&sdata->local->hw, NEED_DTIM_BEFORE_ASSOC) &&
4894 !beacon_ies) {
4895 /*
4896 * Wait up to one beacon interval ...
4897 * should this be more if we miss one?
4898 */
4899 sdata_info(sdata, "waiting for beacon from %pM\n",
4900 ifmgd->bssid);
4901 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4902 assoc_data->timeout_started = true;
4903 assoc_data->need_beacon = true;
4904 } else if (beacon_ies) {
4905 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4906 beacon_ies->data,
4907 beacon_ies->len);
4908 u8 dtim_count = 0;
4909
4910 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4911 const struct ieee80211_tim_ie *tim;
4912 tim = (void *)(tim_ie + 2);
4913 ifmgd->dtim_period = tim->dtim_period;
4914 dtim_count = tim->dtim_count;
4915 }
4916 ifmgd->have_beacon = true;
4917 assoc_data->timeout = jiffies;
4918 assoc_data->timeout_started = true;
4919
4920 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
4921 sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4922 sdata->vif.bss_conf.sync_device_ts =
4923 bss->device_ts_beacon;
4924 sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4925 }
4926 } else {
4927 assoc_data->timeout = jiffies;
4928 assoc_data->timeout_started = true;
4929 }
4930 rcu_read_unlock();
4931
4932 run_again(sdata, assoc_data->timeout);
4933
4934 if (bss->corrupt_data) {
4935 char *corrupt_type = "data";
4936 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4937 if (bss->corrupt_data &
4938 IEEE80211_BSS_CORRUPT_PROBE_RESP)
4939 corrupt_type = "beacon and probe response";
4940 else
4941 corrupt_type = "beacon";
4942 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4943 corrupt_type = "probe response";
4944 sdata_info(sdata, "associating with AP with corrupt %s\n",
4945 corrupt_type);
4946 }
4947
4948 return 0;
4949 err_clear:
4950 eth_zero_addr(ifmgd->bssid);
4951 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4952 ifmgd->assoc_data = NULL;
4953 err_free:
4954 kfree(assoc_data);
4955 return err;
4956 }
4957
4958 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4959 struct cfg80211_deauth_request *req)
4960 {
4961 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4962 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4963 bool tx = !req->local_state_change;
4964
4965 if (ifmgd->auth_data &&
4966 ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
4967 sdata_info(sdata,
4968 "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
4969 req->bssid, req->reason_code,
4970 ieee80211_get_reason_code_string(req->reason_code));
4971
4972 drv_mgd_prepare_tx(sdata->local, sdata);
4973 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4974 IEEE80211_STYPE_DEAUTH,
4975 req->reason_code, tx,
4976 frame_buf);
4977 ieee80211_destroy_auth_data(sdata, false);
4978 ieee80211_report_disconnect(sdata, frame_buf,
4979 sizeof(frame_buf), true,
4980 req->reason_code);
4981
4982 return 0;
4983 }
4984
4985 if (ifmgd->assoc_data &&
4986 ether_addr_equal(ifmgd->assoc_data->bss->bssid, req->bssid)) {
4987 sdata_info(sdata,
4988 "aborting association with %pM by local choice (Reason: %u=%s)\n",
4989 req->bssid, req->reason_code,
4990 ieee80211_get_reason_code_string(req->reason_code));
4991
4992 drv_mgd_prepare_tx(sdata->local, sdata);
4993 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4994 IEEE80211_STYPE_DEAUTH,
4995 req->reason_code, tx,
4996 frame_buf);
4997 ieee80211_destroy_assoc_data(sdata, false, true);
4998 ieee80211_report_disconnect(sdata, frame_buf,
4999 sizeof(frame_buf), true,
5000 req->reason_code);
5001 return 0;
5002 }
5003
5004 if (ifmgd->associated &&
5005 ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
5006 sdata_info(sdata,
5007 "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
5008 req->bssid, req->reason_code,
5009 ieee80211_get_reason_code_string(req->reason_code));
5010
5011 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
5012 req->reason_code, tx, frame_buf);
5013 ieee80211_report_disconnect(sdata, frame_buf,
5014 sizeof(frame_buf), true,
5015 req->reason_code);
5016 return 0;
5017 }
5018
5019 return -ENOTCONN;
5020 }
5021
5022 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
5023 struct cfg80211_disassoc_request *req)
5024 {
5025 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5026 u8 bssid[ETH_ALEN];
5027 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
5028
5029 /*
5030 * cfg80211 should catch this ... but it's racy since
5031 * we can receive a disassoc frame, process it, hand it
5032 * to cfg80211 while that's in a locked section already
5033 * trying to tell us that the user wants to disconnect.
5034 */
5035 if (ifmgd->associated != req->bss)
5036 return -ENOLINK;
5037
5038 sdata_info(sdata,
5039 "disassociating from %pM by local choice (Reason: %u=%s)\n",
5040 req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
5041
5042 memcpy(bssid, req->bss->bssid, ETH_ALEN);
5043 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
5044 req->reason_code, !req->local_state_change,
5045 frame_buf);
5046
5047 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
5048 req->reason_code);
5049
5050 return 0;
5051 }
5052
5053 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
5054 {
5055 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5056
5057 /*
5058 * Make sure some work items will not run after this,
5059 * they will not do anything but might not have been
5060 * cancelled when disconnecting.
5061 */
5062 cancel_work_sync(&ifmgd->monitor_work);
5063 cancel_work_sync(&ifmgd->beacon_connection_loss_work);
5064 cancel_work_sync(&ifmgd->request_smps_work);
5065 cancel_work_sync(&ifmgd->csa_connection_drop_work);
5066 cancel_work_sync(&ifmgd->chswitch_work);
5067 cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
5068
5069 sdata_lock(sdata);
5070 if (ifmgd->assoc_data) {
5071 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
5072 ieee80211_destroy_assoc_data(sdata, false, false);
5073 cfg80211_assoc_timeout(sdata->dev, bss);
5074 }
5075 if (ifmgd->auth_data)
5076 ieee80211_destroy_auth_data(sdata, false);
5077 spin_lock_bh(&ifmgd->teardown_lock);
5078 if (ifmgd->teardown_skb) {
5079 kfree_skb(ifmgd->teardown_skb);
5080 ifmgd->teardown_skb = NULL;
5081 ifmgd->orig_teardown_skb = NULL;
5082 }
5083 spin_unlock_bh(&ifmgd->teardown_lock);
5084 del_timer_sync(&ifmgd->timer);
5085 sdata_unlock(sdata);
5086 }
5087
5088 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
5089 enum nl80211_cqm_rssi_threshold_event rssi_event,
5090 s32 rssi_level,
5091 gfp_t gfp)
5092 {
5093 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5094
5095 trace_api_cqm_rssi_notify(sdata, rssi_event, rssi_level);
5096
5097 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, rssi_level, gfp);
5098 }
5099 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
5100
5101 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp)
5102 {
5103 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5104
5105 trace_api_cqm_beacon_loss_notify(sdata->local, sdata);
5106
5107 cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp);
5108 }
5109 EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify);
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