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Merge tag 'iio-fixes-for-4.10a' of git://git.kernel.org/pub/scm/linux/kernel/git...
[mirror_ubuntu-artful-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 - 2016 Intel Deutschland GmbH
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 */
15
16 #include <linux/delay.h>
17 #include <linux/if_ether.h>
18 #include <linux/skbuff.h>
19 #include <linux/if_arp.h>
20 #include <linux/etherdevice.h>
21 #include <linux/moduleparam.h>
22 #include <linux/rtnetlink.h>
23 #include <linux/crc32.h>
24 #include <linux/slab.h>
25 #include <linux/export.h>
26 #include <net/mac80211.h>
27 #include <asm/unaligned.h>
28
29 #include "ieee80211_i.h"
30 #include "driver-ops.h"
31 #include "rate.h"
32 #include "led.h"
33 #include "fils_aead.h"
34
35 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
36 #define IEEE80211_AUTH_TIMEOUT_LONG (HZ / 2)
37 #define IEEE80211_AUTH_TIMEOUT_SHORT (HZ / 10)
38 #define IEEE80211_AUTH_MAX_TRIES 3
39 #define IEEE80211_AUTH_WAIT_ASSOC (HZ * 5)
40 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
41 #define IEEE80211_ASSOC_TIMEOUT_LONG (HZ / 2)
42 #define IEEE80211_ASSOC_TIMEOUT_SHORT (HZ / 10)
43 #define IEEE80211_ASSOC_MAX_TRIES 3
44
45 static int max_nullfunc_tries = 2;
46 module_param(max_nullfunc_tries, int, 0644);
47 MODULE_PARM_DESC(max_nullfunc_tries,
48 "Maximum nullfunc tx tries before disconnecting (reason 4).");
49
50 static int max_probe_tries = 5;
51 module_param(max_probe_tries, int, 0644);
52 MODULE_PARM_DESC(max_probe_tries,
53 "Maximum probe tries before disconnecting (reason 4).");
54
55 /*
56 * Beacon loss timeout is calculated as N frames times the
57 * advertised beacon interval. This may need to be somewhat
58 * higher than what hardware might detect to account for
59 * delays in the host processing frames. But since we also
60 * probe on beacon miss before declaring the connection lost
61 * default to what we want.
62 */
63 static int beacon_loss_count = 7;
64 module_param(beacon_loss_count, int, 0644);
65 MODULE_PARM_DESC(beacon_loss_count,
66 "Number of beacon intervals before we decide beacon was lost.");
67
68 /*
69 * Time the connection can be idle before we probe
70 * it to see if we can still talk to the AP.
71 */
72 #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ)
73 /*
74 * Time we wait for a probe response after sending
75 * a probe request because of beacon loss or for
76 * checking the connection still works.
77 */
78 static int probe_wait_ms = 500;
79 module_param(probe_wait_ms, int, 0644);
80 MODULE_PARM_DESC(probe_wait_ms,
81 "Maximum time(ms) to wait for probe response"
82 " before disconnecting (reason 4).");
83
84 /*
85 * How many Beacon frames need to have been used in average signal strength
86 * before starting to indicate signal change events.
87 */
88 #define IEEE80211_SIGNAL_AVE_MIN_COUNT 4
89
90 /*
91 * We can have multiple work items (and connection probing)
92 * scheduling this timer, but we need to take care to only
93 * reschedule it when it should fire _earlier_ than it was
94 * asked for before, or if it's not pending right now. This
95 * function ensures that. Note that it then is required to
96 * run this function for all timeouts after the first one
97 * has happened -- the work that runs from this timer will
98 * do that.
99 */
100 static void run_again(struct ieee80211_sub_if_data *sdata,
101 unsigned long timeout)
102 {
103 sdata_assert_lock(sdata);
104
105 if (!timer_pending(&sdata->u.mgd.timer) ||
106 time_before(timeout, sdata->u.mgd.timer.expires))
107 mod_timer(&sdata->u.mgd.timer, timeout);
108 }
109
110 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
111 {
112 if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
113 return;
114
115 if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
116 return;
117
118 mod_timer(&sdata->u.mgd.bcn_mon_timer,
119 round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
120 }
121
122 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
123 {
124 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
125
126 if (unlikely(!ifmgd->associated))
127 return;
128
129 if (ifmgd->probe_send_count)
130 ifmgd->probe_send_count = 0;
131
132 if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
133 return;
134
135 mod_timer(&ifmgd->conn_mon_timer,
136 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
137 }
138
139 static int ecw2cw(int ecw)
140 {
141 return (1 << ecw) - 1;
142 }
143
144 static u32
145 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
146 struct ieee80211_supported_band *sband,
147 struct ieee80211_channel *channel,
148 const struct ieee80211_ht_cap *ht_cap,
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_cap || !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 if (!(ht_cap->cap_info &
174 cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40))) {
175 ret = IEEE80211_STA_DISABLE_40MHZ;
176 vht_chandef = *chandef;
177 goto out;
178 }
179
180 ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
181 channel->band);
182 /* check that channel matches the right operating channel */
183 if (!tracking && channel->center_freq != ht_cfreq) {
184 /*
185 * It's possible that some APs are confused here;
186 * Netgear WNDR3700 sometimes reports 4 higher than
187 * the actual channel in association responses, but
188 * since we look at probe response/beacon data here
189 * it should be OK.
190 */
191 sdata_info(sdata,
192 "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
193 channel->center_freq, ht_cfreq,
194 ht_oper->primary_chan, channel->band);
195 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
196 goto out;
197 }
198
199 /* check 40 MHz support, if we have it */
200 if (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
201 ieee80211_chandef_ht_oper(ht_oper, chandef);
202 } else {
203 /* 40 MHz (and 80 MHz) must be supported for VHT */
204 ret = IEEE80211_STA_DISABLE_VHT;
205 /* also mark 40 MHz disabled */
206 ret |= IEEE80211_STA_DISABLE_40MHZ;
207 goto out;
208 }
209
210 if (!vht_oper || !sband->vht_cap.vht_supported) {
211 ret = IEEE80211_STA_DISABLE_VHT;
212 goto out;
213 }
214
215 vht_chandef = *chandef;
216 if (!ieee80211_chandef_vht_oper(vht_oper, &vht_chandef)) {
217 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
218 sdata_info(sdata,
219 "AP VHT information is invalid, disable VHT\n");
220 ret = IEEE80211_STA_DISABLE_VHT;
221 goto out;
222 }
223
224 if (!cfg80211_chandef_valid(&vht_chandef)) {
225 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
226 sdata_info(sdata,
227 "AP VHT information is invalid, disable VHT\n");
228 ret = IEEE80211_STA_DISABLE_VHT;
229 goto out;
230 }
231
232 if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
233 ret = 0;
234 goto out;
235 }
236
237 if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
238 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
239 sdata_info(sdata,
240 "AP VHT information doesn't match HT, disable VHT\n");
241 ret = IEEE80211_STA_DISABLE_VHT;
242 goto out;
243 }
244
245 *chandef = vht_chandef;
246
247 ret = 0;
248
249 out:
250 /*
251 * When tracking the current AP, don't do any further checks if the
252 * new chandef is identical to the one we're currently using for the
253 * connection. This keeps us from playing ping-pong with regulatory,
254 * without it the following can happen (for example):
255 * - connect to an AP with 80 MHz, world regdom allows 80 MHz
256 * - AP advertises regdom US
257 * - CRDA loads regdom US with 80 MHz prohibited (old database)
258 * - the code below detects an unsupported channel, downgrades, and
259 * we disconnect from the AP in the caller
260 * - disconnect causes CRDA to reload world regdomain and the game
261 * starts anew.
262 * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
263 *
264 * It seems possible that there are still scenarios with CSA or real
265 * bandwidth changes where a this could happen, but those cases are
266 * less common and wouldn't completely prevent using the AP.
267 */
268 if (tracking &&
269 cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
270 return ret;
271
272 /* don't print the message below for VHT mismatch if VHT is disabled */
273 if (ret & IEEE80211_STA_DISABLE_VHT)
274 vht_chandef = *chandef;
275
276 /*
277 * Ignore the DISABLED flag when we're already connected and only
278 * tracking the APs beacon for bandwidth changes - otherwise we
279 * might get disconnected here if we connect to an AP, update our
280 * regulatory information based on the AP's country IE and the
281 * information we have is wrong/outdated and disables the channel
282 * that we're actually using for the connection to the AP.
283 */
284 while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
285 tracking ? 0 :
286 IEEE80211_CHAN_DISABLED)) {
287 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
288 ret = IEEE80211_STA_DISABLE_HT |
289 IEEE80211_STA_DISABLE_VHT;
290 break;
291 }
292
293 ret |= ieee80211_chandef_downgrade(chandef);
294 }
295
296 if (chandef->width != vht_chandef.width && !tracking)
297 sdata_info(sdata,
298 "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
299
300 WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
301 return ret;
302 }
303
304 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
305 struct sta_info *sta,
306 const struct ieee80211_ht_cap *ht_cap,
307 const struct ieee80211_ht_operation *ht_oper,
308 const struct ieee80211_vht_operation *vht_oper,
309 const u8 *bssid, u32 *changed)
310 {
311 struct ieee80211_local *local = sdata->local;
312 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
313 struct ieee80211_supported_band *sband;
314 struct ieee80211_channel *chan;
315 struct cfg80211_chan_def chandef;
316 u16 ht_opmode;
317 u32 flags;
318 enum ieee80211_sta_rx_bandwidth new_sta_bw;
319 int ret;
320
321 /* if HT was/is disabled, don't track any bandwidth changes */
322 if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
323 return 0;
324
325 /* don't check VHT if we associated as non-VHT station */
326 if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
327 vht_oper = NULL;
328
329 if (WARN_ON_ONCE(!sta))
330 return -EINVAL;
331
332 /*
333 * if bss configuration changed store the new one -
334 * this may be applicable even if channel is identical
335 */
336 ht_opmode = le16_to_cpu(ht_oper->operation_mode);
337 if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
338 *changed |= BSS_CHANGED_HT;
339 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
340 }
341
342 chan = sdata->vif.bss_conf.chandef.chan;
343 sband = local->hw.wiphy->bands[chan->band];
344
345 /* calculate new channel (type) based on HT/VHT operation IEs */
346 flags = ieee80211_determine_chantype(sdata, sband, chan,
347 ht_cap, ht_oper, vht_oper,
348 &chandef, true);
349
350 /*
351 * Downgrade the new channel if we associated with restricted
352 * capabilities. For example, if we associated as a 20 MHz STA
353 * to a 40 MHz AP (due to regulatory, capabilities or config
354 * reasons) then switching to a 40 MHz channel now won't do us
355 * any good -- we couldn't use it with the AP.
356 */
357 if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
358 chandef.width == NL80211_CHAN_WIDTH_80P80)
359 flags |= ieee80211_chandef_downgrade(&chandef);
360 if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
361 chandef.width == NL80211_CHAN_WIDTH_160)
362 flags |= ieee80211_chandef_downgrade(&chandef);
363 if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
364 chandef.width > NL80211_CHAN_WIDTH_20)
365 flags |= ieee80211_chandef_downgrade(&chandef);
366
367 if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
368 return 0;
369
370 sdata_info(sdata,
371 "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
372 ifmgd->bssid, chandef.chan->center_freq, chandef.width,
373 chandef.center_freq1, chandef.center_freq2);
374
375 if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
376 IEEE80211_STA_DISABLE_VHT |
377 IEEE80211_STA_DISABLE_40MHZ |
378 IEEE80211_STA_DISABLE_80P80MHZ |
379 IEEE80211_STA_DISABLE_160MHZ)) ||
380 !cfg80211_chandef_valid(&chandef)) {
381 sdata_info(sdata,
382 "AP %pM changed bandwidth in a way we can't support - disconnect\n",
383 ifmgd->bssid);
384 return -EINVAL;
385 }
386
387 switch (chandef.width) {
388 case NL80211_CHAN_WIDTH_20_NOHT:
389 case NL80211_CHAN_WIDTH_20:
390 new_sta_bw = IEEE80211_STA_RX_BW_20;
391 break;
392 case NL80211_CHAN_WIDTH_40:
393 new_sta_bw = IEEE80211_STA_RX_BW_40;
394 break;
395 case NL80211_CHAN_WIDTH_80:
396 new_sta_bw = IEEE80211_STA_RX_BW_80;
397 break;
398 case NL80211_CHAN_WIDTH_80P80:
399 case NL80211_CHAN_WIDTH_160:
400 new_sta_bw = IEEE80211_STA_RX_BW_160;
401 break;
402 default:
403 return -EINVAL;
404 }
405
406 if (new_sta_bw > sta->cur_max_bandwidth)
407 new_sta_bw = sta->cur_max_bandwidth;
408
409 if (new_sta_bw < sta->sta.bandwidth) {
410 sta->sta.bandwidth = new_sta_bw;
411 rate_control_rate_update(local, sband, sta,
412 IEEE80211_RC_BW_CHANGED);
413 }
414
415 ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
416 if (ret) {
417 sdata_info(sdata,
418 "AP %pM changed bandwidth to incompatible one - disconnect\n",
419 ifmgd->bssid);
420 return ret;
421 }
422
423 if (new_sta_bw > sta->sta.bandwidth) {
424 sta->sta.bandwidth = new_sta_bw;
425 rate_control_rate_update(local, sband, sta,
426 IEEE80211_RC_BW_CHANGED);
427 }
428
429 return 0;
430 }
431
432 /* frame sending functions */
433
434 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
435 struct sk_buff *skb, u8 ap_ht_param,
436 struct ieee80211_supported_band *sband,
437 struct ieee80211_channel *channel,
438 enum ieee80211_smps_mode smps)
439 {
440 u8 *pos;
441 u32 flags = channel->flags;
442 u16 cap;
443 struct ieee80211_sta_ht_cap ht_cap;
444
445 BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
446
447 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
448 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
449
450 /* determine capability flags */
451 cap = ht_cap.cap;
452
453 switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
454 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
455 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
456 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
457 cap &= ~IEEE80211_HT_CAP_SGI_40;
458 }
459 break;
460 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
461 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
462 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
463 cap &= ~IEEE80211_HT_CAP_SGI_40;
464 }
465 break;
466 }
467
468 /*
469 * If 40 MHz was disabled associate as though we weren't
470 * capable of 40 MHz -- some broken APs will never fall
471 * back to trying to transmit in 20 MHz.
472 */
473 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
474 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
475 cap &= ~IEEE80211_HT_CAP_SGI_40;
476 }
477
478 /* set SM PS mode properly */
479 cap &= ~IEEE80211_HT_CAP_SM_PS;
480 switch (smps) {
481 case IEEE80211_SMPS_AUTOMATIC:
482 case IEEE80211_SMPS_NUM_MODES:
483 WARN_ON(1);
484 case IEEE80211_SMPS_OFF:
485 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
486 IEEE80211_HT_CAP_SM_PS_SHIFT;
487 break;
488 case IEEE80211_SMPS_STATIC:
489 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
490 IEEE80211_HT_CAP_SM_PS_SHIFT;
491 break;
492 case IEEE80211_SMPS_DYNAMIC:
493 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
494 IEEE80211_HT_CAP_SM_PS_SHIFT;
495 break;
496 }
497
498 /* reserve and fill IE */
499 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
500 ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
501 }
502
503 /* This function determines vht capability flags for the association
504 * and builds the IE.
505 * Note - the function may set the owner of the MU-MIMO capability
506 */
507 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
508 struct sk_buff *skb,
509 struct ieee80211_supported_band *sband,
510 struct ieee80211_vht_cap *ap_vht_cap)
511 {
512 struct ieee80211_local *local = sdata->local;
513 u8 *pos;
514 u32 cap;
515 struct ieee80211_sta_vht_cap vht_cap;
516 u32 mask, ap_bf_sts, our_bf_sts;
517
518 BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
519
520 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
521 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
522
523 /* determine capability flags */
524 cap = vht_cap.cap;
525
526 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
527 u32 bw = cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
528
529 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
530 if (bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ ||
531 bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
532 cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
533 }
534
535 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
536 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
537 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
538 }
539
540 /*
541 * Some APs apparently get confused if our capabilities are better
542 * than theirs, so restrict what we advertise in the assoc request.
543 */
544 if (!(ap_vht_cap->vht_cap_info &
545 cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
546 cap &= ~(IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
547 IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE);
548 else if (!(ap_vht_cap->vht_cap_info &
549 cpu_to_le32(IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE)))
550 cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
551
552 /*
553 * If some other vif is using the MU-MIMO capablity we cannot associate
554 * using MU-MIMO - this will lead to contradictions in the group-id
555 * mechanism.
556 * Ownership is defined since association request, in order to avoid
557 * simultaneous associations with MU-MIMO.
558 */
559 if (cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE) {
560 bool disable_mu_mimo = false;
561 struct ieee80211_sub_if_data *other;
562
563 list_for_each_entry_rcu(other, &local->interfaces, list) {
564 if (other->vif.mu_mimo_owner) {
565 disable_mu_mimo = true;
566 break;
567 }
568 }
569 if (disable_mu_mimo)
570 cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
571 else
572 sdata->vif.mu_mimo_owner = true;
573 }
574
575 mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
576
577 ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask;
578 our_bf_sts = cap & mask;
579
580 if (ap_bf_sts < our_bf_sts) {
581 cap &= ~mask;
582 cap |= ap_bf_sts;
583 }
584
585 /* reserve and fill IE */
586 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
587 ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
588 }
589
590 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
591 {
592 struct ieee80211_local *local = sdata->local;
593 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
594 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
595 struct sk_buff *skb;
596 struct ieee80211_mgmt *mgmt;
597 u8 *pos, qos_info;
598 size_t offset = 0, noffset;
599 int i, count, rates_len, supp_rates_len, shift;
600 u16 capab;
601 struct ieee80211_supported_band *sband;
602 struct ieee80211_chanctx_conf *chanctx_conf;
603 struct ieee80211_channel *chan;
604 u32 rate_flags, rates = 0;
605
606 sdata_assert_lock(sdata);
607
608 rcu_read_lock();
609 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
610 if (WARN_ON(!chanctx_conf)) {
611 rcu_read_unlock();
612 return;
613 }
614 chan = chanctx_conf->def.chan;
615 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
616 rcu_read_unlock();
617 sband = local->hw.wiphy->bands[chan->band];
618 shift = ieee80211_vif_get_shift(&sdata->vif);
619
620 if (assoc_data->supp_rates_len) {
621 /*
622 * Get all rates supported by the device and the AP as
623 * some APs don't like getting a superset of their rates
624 * in the association request (e.g. D-Link DAP 1353 in
625 * b-only mode)...
626 */
627 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
628 assoc_data->supp_rates,
629 assoc_data->supp_rates_len,
630 &rates);
631 } else {
632 /*
633 * In case AP not provide any supported rates information
634 * before association, we send information element(s) with
635 * all rates that we support.
636 */
637 rates_len = 0;
638 for (i = 0; i < sband->n_bitrates; i++) {
639 if ((rate_flags & sband->bitrates[i].flags)
640 != rate_flags)
641 continue;
642 rates |= BIT(i);
643 rates_len++;
644 }
645 }
646
647 skb = alloc_skb(local->hw.extra_tx_headroom +
648 sizeof(*mgmt) + /* bit too much but doesn't matter */
649 2 + assoc_data->ssid_len + /* SSID */
650 4 + rates_len + /* (extended) rates */
651 4 + /* power capability */
652 2 + 2 * sband->n_channels + /* supported channels */
653 2 + sizeof(struct ieee80211_ht_cap) + /* HT */
654 2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
655 assoc_data->ie_len + /* extra IEs */
656 (assoc_data->fils_kek_len ? 16 /* AES-SIV */ : 0) +
657 9, /* WMM */
658 GFP_KERNEL);
659 if (!skb)
660 return;
661
662 skb_reserve(skb, local->hw.extra_tx_headroom);
663
664 capab = WLAN_CAPABILITY_ESS;
665
666 if (sband->band == NL80211_BAND_2GHZ) {
667 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
668 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
669 }
670
671 if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
672 capab |= WLAN_CAPABILITY_PRIVACY;
673
674 if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
675 ieee80211_hw_check(&local->hw, SPECTRUM_MGMT))
676 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
677
678 if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM)
679 capab |= WLAN_CAPABILITY_RADIO_MEASURE;
680
681 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
682 memset(mgmt, 0, 24);
683 memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
684 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
685 memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
686
687 if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
688 skb_put(skb, 10);
689 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
690 IEEE80211_STYPE_REASSOC_REQ);
691 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
692 mgmt->u.reassoc_req.listen_interval =
693 cpu_to_le16(local->hw.conf.listen_interval);
694 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
695 ETH_ALEN);
696 } else {
697 skb_put(skb, 4);
698 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
699 IEEE80211_STYPE_ASSOC_REQ);
700 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
701 mgmt->u.assoc_req.listen_interval =
702 cpu_to_le16(local->hw.conf.listen_interval);
703 }
704
705 /* SSID */
706 pos = skb_put(skb, 2 + assoc_data->ssid_len);
707 *pos++ = WLAN_EID_SSID;
708 *pos++ = assoc_data->ssid_len;
709 memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
710
711 /* add all rates which were marked to be used above */
712 supp_rates_len = rates_len;
713 if (supp_rates_len > 8)
714 supp_rates_len = 8;
715
716 pos = skb_put(skb, supp_rates_len + 2);
717 *pos++ = WLAN_EID_SUPP_RATES;
718 *pos++ = supp_rates_len;
719
720 count = 0;
721 for (i = 0; i < sband->n_bitrates; i++) {
722 if (BIT(i) & rates) {
723 int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
724 5 * (1 << shift));
725 *pos++ = (u8) rate;
726 if (++count == 8)
727 break;
728 }
729 }
730
731 if (rates_len > count) {
732 pos = skb_put(skb, rates_len - count + 2);
733 *pos++ = WLAN_EID_EXT_SUPP_RATES;
734 *pos++ = rates_len - count;
735
736 for (i++; i < sband->n_bitrates; i++) {
737 if (BIT(i) & rates) {
738 int rate;
739 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
740 5 * (1 << shift));
741 *pos++ = (u8) rate;
742 }
743 }
744 }
745
746 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT ||
747 capab & WLAN_CAPABILITY_RADIO_MEASURE) {
748 pos = skb_put(skb, 4);
749 *pos++ = WLAN_EID_PWR_CAPABILITY;
750 *pos++ = 2;
751 *pos++ = 0; /* min tx power */
752 /* max tx power */
753 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
754 }
755
756 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
757 /* TODO: get this in reg domain format */
758 pos = skb_put(skb, 2 * sband->n_channels + 2);
759 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
760 *pos++ = 2 * sband->n_channels;
761 for (i = 0; i < sband->n_channels; i++) {
762 *pos++ = ieee80211_frequency_to_channel(
763 sband->channels[i].center_freq);
764 *pos++ = 1; /* one channel in the subband*/
765 }
766 }
767
768 /* if present, add any custom IEs that go before HT */
769 if (assoc_data->ie_len) {
770 static const u8 before_ht[] = {
771 WLAN_EID_SSID,
772 WLAN_EID_SUPP_RATES,
773 WLAN_EID_EXT_SUPP_RATES,
774 WLAN_EID_PWR_CAPABILITY,
775 WLAN_EID_SUPPORTED_CHANNELS,
776 WLAN_EID_RSN,
777 WLAN_EID_QOS_CAPA,
778 WLAN_EID_RRM_ENABLED_CAPABILITIES,
779 WLAN_EID_MOBILITY_DOMAIN,
780 WLAN_EID_FAST_BSS_TRANSITION, /* reassoc only */
781 WLAN_EID_RIC_DATA, /* reassoc only */
782 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
783 };
784 static const u8 after_ric[] = {
785 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
786 WLAN_EID_HT_CAPABILITY,
787 WLAN_EID_BSS_COEX_2040,
788 WLAN_EID_EXT_CAPABILITY,
789 WLAN_EID_QOS_TRAFFIC_CAPA,
790 WLAN_EID_TIM_BCAST_REQ,
791 WLAN_EID_INTERWORKING,
792 /* 60GHz doesn't happen right now */
793 WLAN_EID_VHT_CAPABILITY,
794 WLAN_EID_OPMODE_NOTIF,
795 };
796
797 noffset = ieee80211_ie_split_ric(assoc_data->ie,
798 assoc_data->ie_len,
799 before_ht,
800 ARRAY_SIZE(before_ht),
801 after_ric,
802 ARRAY_SIZE(after_ric),
803 offset);
804 pos = skb_put(skb, noffset - offset);
805 memcpy(pos, assoc_data->ie + offset, noffset - offset);
806 offset = noffset;
807 }
808
809 if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
810 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
811 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
812
813 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
814 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
815 sband, chan, sdata->smps_mode);
816
817 /* if present, add any custom IEs that go before VHT */
818 if (assoc_data->ie_len) {
819 static const u8 before_vht[] = {
820 WLAN_EID_SSID,
821 WLAN_EID_SUPP_RATES,
822 WLAN_EID_EXT_SUPP_RATES,
823 WLAN_EID_PWR_CAPABILITY,
824 WLAN_EID_SUPPORTED_CHANNELS,
825 WLAN_EID_RSN,
826 WLAN_EID_QOS_CAPA,
827 WLAN_EID_RRM_ENABLED_CAPABILITIES,
828 WLAN_EID_MOBILITY_DOMAIN,
829 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
830 WLAN_EID_HT_CAPABILITY,
831 WLAN_EID_BSS_COEX_2040,
832 WLAN_EID_EXT_CAPABILITY,
833 WLAN_EID_QOS_TRAFFIC_CAPA,
834 WLAN_EID_TIM_BCAST_REQ,
835 WLAN_EID_INTERWORKING,
836 };
837
838 /* RIC already taken above, so no need to handle here anymore */
839 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
840 before_vht, ARRAY_SIZE(before_vht),
841 offset);
842 pos = skb_put(skb, noffset - offset);
843 memcpy(pos, assoc_data->ie + offset, noffset - offset);
844 offset = noffset;
845 }
846
847 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
848 ieee80211_add_vht_ie(sdata, skb, sband,
849 &assoc_data->ap_vht_cap);
850
851 /* if present, add any custom non-vendor IEs that go after HT */
852 if (assoc_data->ie_len) {
853 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
854 assoc_data->ie_len,
855 offset);
856 pos = skb_put(skb, noffset - offset);
857 memcpy(pos, assoc_data->ie + offset, noffset - offset);
858 offset = noffset;
859 }
860
861 if (assoc_data->wmm) {
862 if (assoc_data->uapsd) {
863 qos_info = ifmgd->uapsd_queues;
864 qos_info |= (ifmgd->uapsd_max_sp_len <<
865 IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
866 } else {
867 qos_info = 0;
868 }
869
870 pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
871 }
872
873 /* add any remaining custom (i.e. vendor specific here) IEs */
874 if (assoc_data->ie_len) {
875 noffset = assoc_data->ie_len;
876 pos = skb_put(skb, noffset - offset);
877 memcpy(pos, assoc_data->ie + offset, noffset - offset);
878 }
879
880 if (assoc_data->fils_kek_len &&
881 fils_encrypt_assoc_req(skb, assoc_data) < 0) {
882 dev_kfree_skb(skb);
883 return;
884 }
885
886 drv_mgd_prepare_tx(local, sdata);
887
888 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
889 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
890 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
891 IEEE80211_TX_INTFL_MLME_CONN_TX;
892 ieee80211_tx_skb(sdata, skb);
893 }
894
895 void ieee80211_send_pspoll(struct ieee80211_local *local,
896 struct ieee80211_sub_if_data *sdata)
897 {
898 struct ieee80211_pspoll *pspoll;
899 struct sk_buff *skb;
900
901 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
902 if (!skb)
903 return;
904
905 pspoll = (struct ieee80211_pspoll *) skb->data;
906 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
907
908 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
909 ieee80211_tx_skb(sdata, skb);
910 }
911
912 void ieee80211_send_nullfunc(struct ieee80211_local *local,
913 struct ieee80211_sub_if_data *sdata,
914 bool powersave)
915 {
916 struct sk_buff *skb;
917 struct ieee80211_hdr_3addr *nullfunc;
918 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
919
920 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
921 if (!skb)
922 return;
923
924 nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
925 if (powersave)
926 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
927
928 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
929 IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
930
931 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
932 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
933
934 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
935 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
936
937 ieee80211_tx_skb(sdata, skb);
938 }
939
940 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
941 struct ieee80211_sub_if_data *sdata)
942 {
943 struct sk_buff *skb;
944 struct ieee80211_hdr *nullfunc;
945 __le16 fc;
946
947 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
948 return;
949
950 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
951 if (!skb)
952 return;
953
954 skb_reserve(skb, local->hw.extra_tx_headroom);
955
956 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
957 memset(nullfunc, 0, 30);
958 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
959 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
960 nullfunc->frame_control = fc;
961 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
962 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
963 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
964 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
965
966 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
967 ieee80211_tx_skb(sdata, skb);
968 }
969
970 /* spectrum management related things */
971 static void ieee80211_chswitch_work(struct work_struct *work)
972 {
973 struct ieee80211_sub_if_data *sdata =
974 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
975 struct ieee80211_local *local = sdata->local;
976 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
977 int ret;
978
979 if (!ieee80211_sdata_running(sdata))
980 return;
981
982 sdata_lock(sdata);
983 mutex_lock(&local->mtx);
984 mutex_lock(&local->chanctx_mtx);
985
986 if (!ifmgd->associated)
987 goto out;
988
989 if (!sdata->vif.csa_active)
990 goto out;
991
992 /*
993 * using reservation isn't immediate as it may be deferred until later
994 * with multi-vif. once reservation is complete it will re-schedule the
995 * work with no reserved_chanctx so verify chandef to check if it
996 * completed successfully
997 */
998
999 if (sdata->reserved_chanctx) {
1000 /*
1001 * with multi-vif csa driver may call ieee80211_csa_finish()
1002 * many times while waiting for other interfaces to use their
1003 * reservations
1004 */
1005 if (sdata->reserved_ready)
1006 goto out;
1007
1008 ret = ieee80211_vif_use_reserved_context(sdata);
1009 if (ret) {
1010 sdata_info(sdata,
1011 "failed to use reserved channel context, disconnecting (err=%d)\n",
1012 ret);
1013 ieee80211_queue_work(&sdata->local->hw,
1014 &ifmgd->csa_connection_drop_work);
1015 goto out;
1016 }
1017
1018 goto out;
1019 }
1020
1021 if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
1022 &sdata->csa_chandef)) {
1023 sdata_info(sdata,
1024 "failed to finalize channel switch, disconnecting\n");
1025 ieee80211_queue_work(&sdata->local->hw,
1026 &ifmgd->csa_connection_drop_work);
1027 goto out;
1028 }
1029
1030 /* XXX: shouldn't really modify cfg80211-owned data! */
1031 ifmgd->associated->channel = sdata->csa_chandef.chan;
1032
1033 ifmgd->csa_waiting_bcn = true;
1034
1035 ieee80211_sta_reset_beacon_monitor(sdata);
1036 ieee80211_sta_reset_conn_monitor(sdata);
1037
1038 out:
1039 mutex_unlock(&local->chanctx_mtx);
1040 mutex_unlock(&local->mtx);
1041 sdata_unlock(sdata);
1042 }
1043
1044 static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata)
1045 {
1046 struct ieee80211_local *local = sdata->local;
1047 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1048 int ret;
1049
1050 sdata_assert_lock(sdata);
1051
1052 WARN_ON(!sdata->vif.csa_active);
1053
1054 if (sdata->csa_block_tx) {
1055 ieee80211_wake_vif_queues(local, sdata,
1056 IEEE80211_QUEUE_STOP_REASON_CSA);
1057 sdata->csa_block_tx = false;
1058 }
1059
1060 sdata->vif.csa_active = false;
1061 ifmgd->csa_waiting_bcn = false;
1062
1063 ret = drv_post_channel_switch(sdata);
1064 if (ret) {
1065 sdata_info(sdata,
1066 "driver post channel switch failed, disconnecting\n");
1067 ieee80211_queue_work(&local->hw,
1068 &ifmgd->csa_connection_drop_work);
1069 return;
1070 }
1071
1072 cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef);
1073 }
1074
1075 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
1076 {
1077 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1078 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1079
1080 trace_api_chswitch_done(sdata, success);
1081 if (!success) {
1082 sdata_info(sdata,
1083 "driver channel switch failed, disconnecting\n");
1084 ieee80211_queue_work(&sdata->local->hw,
1085 &ifmgd->csa_connection_drop_work);
1086 } else {
1087 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1088 }
1089 }
1090 EXPORT_SYMBOL(ieee80211_chswitch_done);
1091
1092 static void ieee80211_chswitch_timer(unsigned long data)
1093 {
1094 struct ieee80211_sub_if_data *sdata =
1095 (struct ieee80211_sub_if_data *) data;
1096
1097 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1098 }
1099
1100 static void
1101 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1102 u64 timestamp, u32 device_timestamp,
1103 struct ieee802_11_elems *elems,
1104 bool beacon)
1105 {
1106 struct ieee80211_local *local = sdata->local;
1107 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1108 struct cfg80211_bss *cbss = ifmgd->associated;
1109 struct ieee80211_chanctx_conf *conf;
1110 struct ieee80211_chanctx *chanctx;
1111 enum nl80211_band current_band;
1112 struct ieee80211_csa_ie csa_ie;
1113 struct ieee80211_channel_switch ch_switch;
1114 int res;
1115
1116 sdata_assert_lock(sdata);
1117
1118 if (!cbss)
1119 return;
1120
1121 if (local->scanning)
1122 return;
1123
1124 /* disregard subsequent announcements if we are already processing */
1125 if (sdata->vif.csa_active)
1126 return;
1127
1128 current_band = cbss->channel->band;
1129 memset(&csa_ie, 0, sizeof(csa_ie));
1130 res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
1131 ifmgd->flags,
1132 ifmgd->associated->bssid, &csa_ie);
1133 if (res < 0)
1134 ieee80211_queue_work(&local->hw,
1135 &ifmgd->csa_connection_drop_work);
1136 if (res)
1137 return;
1138
1139 if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1140 IEEE80211_CHAN_DISABLED)) {
1141 sdata_info(sdata,
1142 "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1143 ifmgd->associated->bssid,
1144 csa_ie.chandef.chan->center_freq,
1145 csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1146 csa_ie.chandef.center_freq2);
1147 ieee80211_queue_work(&local->hw,
1148 &ifmgd->csa_connection_drop_work);
1149 return;
1150 }
1151
1152 if (cfg80211_chandef_identical(&csa_ie.chandef,
1153 &sdata->vif.bss_conf.chandef)) {
1154 if (ifmgd->csa_ignored_same_chan)
1155 return;
1156 sdata_info(sdata,
1157 "AP %pM tries to chanswitch to same channel, ignore\n",
1158 ifmgd->associated->bssid);
1159 ifmgd->csa_ignored_same_chan = true;
1160 return;
1161 }
1162
1163 /*
1164 * Drop all TDLS peers - either we disconnect or move to a different
1165 * channel from this point on. There's no telling what our peer will do.
1166 * The TDLS WIDER_BW scenario is also problematic, as peers might now
1167 * have an incompatible wider chandef.
1168 */
1169 ieee80211_teardown_tdls_peers(sdata);
1170
1171 mutex_lock(&local->mtx);
1172 mutex_lock(&local->chanctx_mtx);
1173 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1174 lockdep_is_held(&local->chanctx_mtx));
1175 if (!conf) {
1176 sdata_info(sdata,
1177 "no channel context assigned to vif?, disconnecting\n");
1178 goto drop_connection;
1179 }
1180
1181 chanctx = container_of(conf, struct ieee80211_chanctx, conf);
1182
1183 if (local->use_chanctx &&
1184 !ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA)) {
1185 sdata_info(sdata,
1186 "driver doesn't support chan-switch with channel contexts\n");
1187 goto drop_connection;
1188 }
1189
1190 ch_switch.timestamp = timestamp;
1191 ch_switch.device_timestamp = device_timestamp;
1192 ch_switch.block_tx = csa_ie.mode;
1193 ch_switch.chandef = csa_ie.chandef;
1194 ch_switch.count = csa_ie.count;
1195
1196 if (drv_pre_channel_switch(sdata, &ch_switch)) {
1197 sdata_info(sdata,
1198 "preparing for channel switch failed, disconnecting\n");
1199 goto drop_connection;
1200 }
1201
1202 res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
1203 chanctx->mode, false);
1204 if (res) {
1205 sdata_info(sdata,
1206 "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
1207 res);
1208 goto drop_connection;
1209 }
1210 mutex_unlock(&local->chanctx_mtx);
1211
1212 sdata->vif.csa_active = true;
1213 sdata->csa_chandef = csa_ie.chandef;
1214 sdata->csa_block_tx = csa_ie.mode;
1215 ifmgd->csa_ignored_same_chan = false;
1216
1217 if (sdata->csa_block_tx)
1218 ieee80211_stop_vif_queues(local, sdata,
1219 IEEE80211_QUEUE_STOP_REASON_CSA);
1220 mutex_unlock(&local->mtx);
1221
1222 cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
1223 csa_ie.count);
1224
1225 if (local->ops->channel_switch) {
1226 /* use driver's channel switch callback */
1227 drv_channel_switch(local, sdata, &ch_switch);
1228 return;
1229 }
1230
1231 /* channel switch handled in software */
1232 if (csa_ie.count <= 1)
1233 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1234 else
1235 mod_timer(&ifmgd->chswitch_timer,
1236 TU_TO_EXP_TIME((csa_ie.count - 1) *
1237 cbss->beacon_interval));
1238 return;
1239 drop_connection:
1240 ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work);
1241 mutex_unlock(&local->chanctx_mtx);
1242 mutex_unlock(&local->mtx);
1243 }
1244
1245 static bool
1246 ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
1247 struct ieee80211_channel *channel,
1248 const u8 *country_ie, u8 country_ie_len,
1249 const u8 *pwr_constr_elem,
1250 int *chan_pwr, int *pwr_reduction)
1251 {
1252 struct ieee80211_country_ie_triplet *triplet;
1253 int chan = ieee80211_frequency_to_channel(channel->center_freq);
1254 int i, chan_increment;
1255 bool have_chan_pwr = false;
1256
1257 /* Invalid IE */
1258 if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1259 return false;
1260
1261 triplet = (void *)(country_ie + 3);
1262 country_ie_len -= 3;
1263
1264 switch (channel->band) {
1265 default:
1266 WARN_ON_ONCE(1);
1267 /* fall through */
1268 case NL80211_BAND_2GHZ:
1269 case NL80211_BAND_60GHZ:
1270 chan_increment = 1;
1271 break;
1272 case NL80211_BAND_5GHZ:
1273 chan_increment = 4;
1274 break;
1275 }
1276
1277 /* find channel */
1278 while (country_ie_len >= 3) {
1279 u8 first_channel = triplet->chans.first_channel;
1280
1281 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1282 goto next;
1283
1284 for (i = 0; i < triplet->chans.num_channels; i++) {
1285 if (first_channel + i * chan_increment == chan) {
1286 have_chan_pwr = true;
1287 *chan_pwr = triplet->chans.max_power;
1288 break;
1289 }
1290 }
1291 if (have_chan_pwr)
1292 break;
1293
1294 next:
1295 triplet++;
1296 country_ie_len -= 3;
1297 }
1298
1299 if (have_chan_pwr && pwr_constr_elem)
1300 *pwr_reduction = *pwr_constr_elem;
1301 else
1302 *pwr_reduction = 0;
1303
1304 return have_chan_pwr;
1305 }
1306
1307 static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata,
1308 struct ieee80211_channel *channel,
1309 const u8 *cisco_dtpc_ie,
1310 int *pwr_level)
1311 {
1312 /* From practical testing, the first data byte of the DTPC element
1313 * seems to contain the requested dBm level, and the CLI on Cisco
1314 * APs clearly state the range is -127 to 127 dBm, which indicates
1315 * a signed byte, although it seemingly never actually goes negative.
1316 * The other byte seems to always be zero.
1317 */
1318 *pwr_level = (__s8)cisco_dtpc_ie[4];
1319 }
1320
1321 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1322 struct ieee80211_channel *channel,
1323 struct ieee80211_mgmt *mgmt,
1324 const u8 *country_ie, u8 country_ie_len,
1325 const u8 *pwr_constr_ie,
1326 const u8 *cisco_dtpc_ie)
1327 {
1328 bool has_80211h_pwr = false, has_cisco_pwr = false;
1329 int chan_pwr = 0, pwr_reduction_80211h = 0;
1330 int pwr_level_cisco, pwr_level_80211h;
1331 int new_ap_level;
1332 __le16 capab = mgmt->u.probe_resp.capab_info;
1333
1334 if (country_ie &&
1335 (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) ||
1336 capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) {
1337 has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
1338 sdata, channel, country_ie, country_ie_len,
1339 pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1340 pwr_level_80211h =
1341 max_t(int, 0, chan_pwr - pwr_reduction_80211h);
1342 }
1343
1344 if (cisco_dtpc_ie) {
1345 ieee80211_find_cisco_dtpc(
1346 sdata, channel, cisco_dtpc_ie, &pwr_level_cisco);
1347 has_cisco_pwr = true;
1348 }
1349
1350 if (!has_80211h_pwr && !has_cisco_pwr)
1351 return 0;
1352
1353 /* If we have both 802.11h and Cisco DTPC, apply both limits
1354 * by picking the smallest of the two power levels advertised.
1355 */
1356 if (has_80211h_pwr &&
1357 (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) {
1358 new_ap_level = pwr_level_80211h;
1359
1360 if (sdata->ap_power_level == new_ap_level)
1361 return 0;
1362
1363 sdata_dbg(sdata,
1364 "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1365 pwr_level_80211h, chan_pwr, pwr_reduction_80211h,
1366 sdata->u.mgd.bssid);
1367 } else { /* has_cisco_pwr is always true here. */
1368 new_ap_level = pwr_level_cisco;
1369
1370 if (sdata->ap_power_level == new_ap_level)
1371 return 0;
1372
1373 sdata_dbg(sdata,
1374 "Limiting TX power to %d dBm as advertised by %pM\n",
1375 pwr_level_cisco, sdata->u.mgd.bssid);
1376 }
1377
1378 sdata->ap_power_level = new_ap_level;
1379 if (__ieee80211_recalc_txpower(sdata))
1380 return BSS_CHANGED_TXPOWER;
1381 return 0;
1382 }
1383
1384 /* powersave */
1385 static void ieee80211_enable_ps(struct ieee80211_local *local,
1386 struct ieee80211_sub_if_data *sdata)
1387 {
1388 struct ieee80211_conf *conf = &local->hw.conf;
1389
1390 /*
1391 * If we are scanning right now then the parameters will
1392 * take effect when scan finishes.
1393 */
1394 if (local->scanning)
1395 return;
1396
1397 if (conf->dynamic_ps_timeout > 0 &&
1398 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) {
1399 mod_timer(&local->dynamic_ps_timer, jiffies +
1400 msecs_to_jiffies(conf->dynamic_ps_timeout));
1401 } else {
1402 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
1403 ieee80211_send_nullfunc(local, sdata, true);
1404
1405 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1406 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
1407 return;
1408
1409 conf->flags |= IEEE80211_CONF_PS;
1410 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1411 }
1412 }
1413
1414 static void ieee80211_change_ps(struct ieee80211_local *local)
1415 {
1416 struct ieee80211_conf *conf = &local->hw.conf;
1417
1418 if (local->ps_sdata) {
1419 ieee80211_enable_ps(local, local->ps_sdata);
1420 } else if (conf->flags & IEEE80211_CONF_PS) {
1421 conf->flags &= ~IEEE80211_CONF_PS;
1422 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1423 del_timer_sync(&local->dynamic_ps_timer);
1424 cancel_work_sync(&local->dynamic_ps_enable_work);
1425 }
1426 }
1427
1428 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1429 {
1430 struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1431 struct sta_info *sta = NULL;
1432 bool authorized = false;
1433
1434 if (!mgd->powersave)
1435 return false;
1436
1437 if (mgd->broken_ap)
1438 return false;
1439
1440 if (!mgd->associated)
1441 return false;
1442
1443 if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1444 return false;
1445
1446 if (!mgd->have_beacon)
1447 return false;
1448
1449 rcu_read_lock();
1450 sta = sta_info_get(sdata, mgd->bssid);
1451 if (sta)
1452 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1453 rcu_read_unlock();
1454
1455 return authorized;
1456 }
1457
1458 /* need to hold RTNL or interface lock */
1459 void ieee80211_recalc_ps(struct ieee80211_local *local)
1460 {
1461 struct ieee80211_sub_if_data *sdata, *found = NULL;
1462 int count = 0;
1463 int timeout;
1464
1465 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) {
1466 local->ps_sdata = NULL;
1467 return;
1468 }
1469
1470 list_for_each_entry(sdata, &local->interfaces, list) {
1471 if (!ieee80211_sdata_running(sdata))
1472 continue;
1473 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1474 /* If an AP vif is found, then disable PS
1475 * by setting the count to zero thereby setting
1476 * ps_sdata to NULL.
1477 */
1478 count = 0;
1479 break;
1480 }
1481 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1482 continue;
1483 found = sdata;
1484 count++;
1485 }
1486
1487 if (count == 1 && ieee80211_powersave_allowed(found)) {
1488 u8 dtimper = found->u.mgd.dtim_period;
1489 s32 beaconint_us;
1490
1491 beaconint_us = ieee80211_tu_to_usec(
1492 found->vif.bss_conf.beacon_int);
1493
1494 timeout = local->dynamic_ps_forced_timeout;
1495 if (timeout < 0)
1496 timeout = 100;
1497 local->hw.conf.dynamic_ps_timeout = timeout;
1498
1499 /* If the TIM IE is invalid, pretend the value is 1 */
1500 if (!dtimper)
1501 dtimper = 1;
1502
1503 local->hw.conf.ps_dtim_period = dtimper;
1504 local->ps_sdata = found;
1505 } else {
1506 local->ps_sdata = NULL;
1507 }
1508
1509 ieee80211_change_ps(local);
1510 }
1511
1512 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1513 {
1514 bool ps_allowed = ieee80211_powersave_allowed(sdata);
1515
1516 if (sdata->vif.bss_conf.ps != ps_allowed) {
1517 sdata->vif.bss_conf.ps = ps_allowed;
1518 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1519 }
1520 }
1521
1522 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1523 {
1524 struct ieee80211_local *local =
1525 container_of(work, struct ieee80211_local,
1526 dynamic_ps_disable_work);
1527
1528 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1529 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1530 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1531 }
1532
1533 ieee80211_wake_queues_by_reason(&local->hw,
1534 IEEE80211_MAX_QUEUE_MAP,
1535 IEEE80211_QUEUE_STOP_REASON_PS,
1536 false);
1537 }
1538
1539 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1540 {
1541 struct ieee80211_local *local =
1542 container_of(work, struct ieee80211_local,
1543 dynamic_ps_enable_work);
1544 struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1545 struct ieee80211_if_managed *ifmgd;
1546 unsigned long flags;
1547 int q;
1548
1549 /* can only happen when PS was just disabled anyway */
1550 if (!sdata)
1551 return;
1552
1553 ifmgd = &sdata->u.mgd;
1554
1555 if (local->hw.conf.flags & IEEE80211_CONF_PS)
1556 return;
1557
1558 if (local->hw.conf.dynamic_ps_timeout > 0) {
1559 /* don't enter PS if TX frames are pending */
1560 if (drv_tx_frames_pending(local)) {
1561 mod_timer(&local->dynamic_ps_timer, jiffies +
1562 msecs_to_jiffies(
1563 local->hw.conf.dynamic_ps_timeout));
1564 return;
1565 }
1566
1567 /*
1568 * transmission can be stopped by others which leads to
1569 * dynamic_ps_timer expiry. Postpone the ps timer if it
1570 * is not the actual idle state.
1571 */
1572 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1573 for (q = 0; q < local->hw.queues; q++) {
1574 if (local->queue_stop_reasons[q]) {
1575 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1576 flags);
1577 mod_timer(&local->dynamic_ps_timer, jiffies +
1578 msecs_to_jiffies(
1579 local->hw.conf.dynamic_ps_timeout));
1580 return;
1581 }
1582 }
1583 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1584 }
1585
1586 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1587 !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1588 if (drv_tx_frames_pending(local)) {
1589 mod_timer(&local->dynamic_ps_timer, jiffies +
1590 msecs_to_jiffies(
1591 local->hw.conf.dynamic_ps_timeout));
1592 } else {
1593 ieee80211_send_nullfunc(local, sdata, true);
1594 /* Flush to get the tx status of nullfunc frame */
1595 ieee80211_flush_queues(local, sdata, false);
1596 }
1597 }
1598
1599 if (!(ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
1600 ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) ||
1601 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1602 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1603 local->hw.conf.flags |= IEEE80211_CONF_PS;
1604 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1605 }
1606 }
1607
1608 void ieee80211_dynamic_ps_timer(unsigned long data)
1609 {
1610 struct ieee80211_local *local = (void *) data;
1611
1612 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1613 }
1614
1615 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1616 {
1617 struct delayed_work *delayed_work = to_delayed_work(work);
1618 struct ieee80211_sub_if_data *sdata =
1619 container_of(delayed_work, struct ieee80211_sub_if_data,
1620 dfs_cac_timer_work);
1621 struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1622
1623 mutex_lock(&sdata->local->mtx);
1624 if (sdata->wdev.cac_started) {
1625 ieee80211_vif_release_channel(sdata);
1626 cfg80211_cac_event(sdata->dev, &chandef,
1627 NL80211_RADAR_CAC_FINISHED,
1628 GFP_KERNEL);
1629 }
1630 mutex_unlock(&sdata->local->mtx);
1631 }
1632
1633 static bool
1634 __ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1635 {
1636 struct ieee80211_local *local = sdata->local;
1637 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1638 bool ret = false;
1639 int ac;
1640
1641 if (local->hw.queues < IEEE80211_NUM_ACS)
1642 return false;
1643
1644 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1645 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
1646 int non_acm_ac;
1647 unsigned long now = jiffies;
1648
1649 if (tx_tspec->action == TX_TSPEC_ACTION_NONE &&
1650 tx_tspec->admitted_time &&
1651 time_after(now, tx_tspec->time_slice_start + HZ)) {
1652 tx_tspec->consumed_tx_time = 0;
1653 tx_tspec->time_slice_start = now;
1654
1655 if (tx_tspec->downgraded)
1656 tx_tspec->action =
1657 TX_TSPEC_ACTION_STOP_DOWNGRADE;
1658 }
1659
1660 switch (tx_tspec->action) {
1661 case TX_TSPEC_ACTION_STOP_DOWNGRADE:
1662 /* take the original parameters */
1663 if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac]))
1664 sdata_err(sdata,
1665 "failed to set TX queue parameters for queue %d\n",
1666 ac);
1667 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1668 tx_tspec->downgraded = false;
1669 ret = true;
1670 break;
1671 case TX_TSPEC_ACTION_DOWNGRADE:
1672 if (time_after(now, tx_tspec->time_slice_start + HZ)) {
1673 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1674 ret = true;
1675 break;
1676 }
1677 /* downgrade next lower non-ACM AC */
1678 for (non_acm_ac = ac + 1;
1679 non_acm_ac < IEEE80211_NUM_ACS;
1680 non_acm_ac++)
1681 if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac)))
1682 break;
1683 /* Usually the loop will result in using BK even if it
1684 * requires admission control, but such a configuration
1685 * makes no sense and we have to transmit somehow - the
1686 * AC selection does the same thing.
1687 * If we started out trying to downgrade from BK, then
1688 * the extra condition here might be needed.
1689 */
1690 if (non_acm_ac >= IEEE80211_NUM_ACS)
1691 non_acm_ac = IEEE80211_AC_BK;
1692 if (drv_conf_tx(local, sdata, ac,
1693 &sdata->tx_conf[non_acm_ac]))
1694 sdata_err(sdata,
1695 "failed to set TX queue parameters for queue %d\n",
1696 ac);
1697 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1698 ret = true;
1699 schedule_delayed_work(&ifmgd->tx_tspec_wk,
1700 tx_tspec->time_slice_start + HZ - now + 1);
1701 break;
1702 case TX_TSPEC_ACTION_NONE:
1703 /* nothing now */
1704 break;
1705 }
1706 }
1707
1708 return ret;
1709 }
1710
1711 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1712 {
1713 if (__ieee80211_sta_handle_tspec_ac_params(sdata))
1714 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
1715 }
1716
1717 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work)
1718 {
1719 struct ieee80211_sub_if_data *sdata;
1720
1721 sdata = container_of(work, struct ieee80211_sub_if_data,
1722 u.mgd.tx_tspec_wk.work);
1723 ieee80211_sta_handle_tspec_ac_params(sdata);
1724 }
1725
1726 /* MLME */
1727 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1728 struct ieee80211_sub_if_data *sdata,
1729 const u8 *wmm_param, size_t wmm_param_len)
1730 {
1731 struct ieee80211_tx_queue_params params[IEEE80211_NUM_ACS];
1732 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1733 size_t left;
1734 int count, ac;
1735 const u8 *pos;
1736 u8 uapsd_queues = 0;
1737
1738 if (!local->ops->conf_tx)
1739 return false;
1740
1741 if (local->hw.queues < IEEE80211_NUM_ACS)
1742 return false;
1743
1744 if (!wmm_param)
1745 return false;
1746
1747 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1748 return false;
1749
1750 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1751 uapsd_queues = ifmgd->uapsd_queues;
1752
1753 count = wmm_param[6] & 0x0f;
1754 if (count == ifmgd->wmm_last_param_set)
1755 return false;
1756 ifmgd->wmm_last_param_set = count;
1757
1758 pos = wmm_param + 8;
1759 left = wmm_param_len - 8;
1760
1761 memset(&params, 0, sizeof(params));
1762
1763 sdata->wmm_acm = 0;
1764 for (; left >= 4; left -= 4, pos += 4) {
1765 int aci = (pos[0] >> 5) & 0x03;
1766 int acm = (pos[0] >> 4) & 0x01;
1767 bool uapsd = false;
1768
1769 switch (aci) {
1770 case 1: /* AC_BK */
1771 ac = IEEE80211_AC_BK;
1772 if (acm)
1773 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1774 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1775 uapsd = true;
1776 break;
1777 case 2: /* AC_VI */
1778 ac = IEEE80211_AC_VI;
1779 if (acm)
1780 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1781 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1782 uapsd = true;
1783 break;
1784 case 3: /* AC_VO */
1785 ac = IEEE80211_AC_VO;
1786 if (acm)
1787 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1788 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1789 uapsd = true;
1790 break;
1791 case 0: /* AC_BE */
1792 default:
1793 ac = IEEE80211_AC_BE;
1794 if (acm)
1795 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1796 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1797 uapsd = true;
1798 break;
1799 }
1800
1801 params[ac].aifs = pos[0] & 0x0f;
1802
1803 if (params[ac].aifs < 2) {
1804 sdata_info(sdata,
1805 "AP has invalid WMM params (AIFSN=%d for ACI %d), will use 2\n",
1806 params[ac].aifs, aci);
1807 params[ac].aifs = 2;
1808 }
1809 params[ac].cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1810 params[ac].cw_min = ecw2cw(pos[1] & 0x0f);
1811 params[ac].txop = get_unaligned_le16(pos + 2);
1812 params[ac].acm = acm;
1813 params[ac].uapsd = uapsd;
1814
1815 if (params[ac].cw_min > params[ac].cw_max) {
1816 sdata_info(sdata,
1817 "AP has invalid WMM params (CWmin/max=%d/%d for ACI %d), using defaults\n",
1818 params[ac].cw_min, params[ac].cw_max, aci);
1819 return false;
1820 }
1821 }
1822
1823 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1824 mlme_dbg(sdata,
1825 "WMM AC=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n",
1826 ac, params[ac].acm,
1827 params[ac].aifs, params[ac].cw_min, params[ac].cw_max,
1828 params[ac].txop, params[ac].uapsd,
1829 ifmgd->tx_tspec[ac].downgraded);
1830 sdata->tx_conf[ac] = params[ac];
1831 if (!ifmgd->tx_tspec[ac].downgraded &&
1832 drv_conf_tx(local, sdata, ac, &params[ac]))
1833 sdata_err(sdata,
1834 "failed to set TX queue parameters for AC %d\n",
1835 ac);
1836 }
1837
1838 /* enable WMM or activate new settings */
1839 sdata->vif.bss_conf.qos = true;
1840 return true;
1841 }
1842
1843 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1844 {
1845 lockdep_assert_held(&sdata->local->mtx);
1846
1847 sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1848 ieee80211_run_deferred_scan(sdata->local);
1849 }
1850
1851 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1852 {
1853 mutex_lock(&sdata->local->mtx);
1854 __ieee80211_stop_poll(sdata);
1855 mutex_unlock(&sdata->local->mtx);
1856 }
1857
1858 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1859 u16 capab, bool erp_valid, u8 erp)
1860 {
1861 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1862 u32 changed = 0;
1863 bool use_protection;
1864 bool use_short_preamble;
1865 bool use_short_slot;
1866
1867 if (erp_valid) {
1868 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1869 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1870 } else {
1871 use_protection = false;
1872 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1873 }
1874
1875 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1876 if (ieee80211_get_sdata_band(sdata) == NL80211_BAND_5GHZ)
1877 use_short_slot = true;
1878
1879 if (use_protection != bss_conf->use_cts_prot) {
1880 bss_conf->use_cts_prot = use_protection;
1881 changed |= BSS_CHANGED_ERP_CTS_PROT;
1882 }
1883
1884 if (use_short_preamble != bss_conf->use_short_preamble) {
1885 bss_conf->use_short_preamble = use_short_preamble;
1886 changed |= BSS_CHANGED_ERP_PREAMBLE;
1887 }
1888
1889 if (use_short_slot != bss_conf->use_short_slot) {
1890 bss_conf->use_short_slot = use_short_slot;
1891 changed |= BSS_CHANGED_ERP_SLOT;
1892 }
1893
1894 return changed;
1895 }
1896
1897 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1898 struct cfg80211_bss *cbss,
1899 u32 bss_info_changed)
1900 {
1901 struct ieee80211_bss *bss = (void *)cbss->priv;
1902 struct ieee80211_local *local = sdata->local;
1903 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1904
1905 bss_info_changed |= BSS_CHANGED_ASSOC;
1906 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1907 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1908
1909 sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1910 beacon_loss_count * bss_conf->beacon_int));
1911
1912 sdata->u.mgd.associated = cbss;
1913 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1914
1915 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1916
1917 if (sdata->vif.p2p ||
1918 sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) {
1919 const struct cfg80211_bss_ies *ies;
1920
1921 rcu_read_lock();
1922 ies = rcu_dereference(cbss->ies);
1923 if (ies) {
1924 int ret;
1925
1926 ret = cfg80211_get_p2p_attr(
1927 ies->data, ies->len,
1928 IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1929 (u8 *) &bss_conf->p2p_noa_attr,
1930 sizeof(bss_conf->p2p_noa_attr));
1931 if (ret >= 2) {
1932 sdata->u.mgd.p2p_noa_index =
1933 bss_conf->p2p_noa_attr.index;
1934 bss_info_changed |= BSS_CHANGED_P2P_PS;
1935 }
1936 }
1937 rcu_read_unlock();
1938 }
1939
1940 /* just to be sure */
1941 ieee80211_stop_poll(sdata);
1942
1943 ieee80211_led_assoc(local, 1);
1944
1945 if (sdata->u.mgd.have_beacon) {
1946 /*
1947 * If the AP is buggy we may get here with no DTIM period
1948 * known, so assume it's 1 which is the only safe assumption
1949 * in that case, although if the TIM IE is broken powersave
1950 * probably just won't work at all.
1951 */
1952 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1953 bss_conf->beacon_rate = bss->beacon_rate;
1954 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1955 } else {
1956 bss_conf->beacon_rate = NULL;
1957 bss_conf->dtim_period = 0;
1958 }
1959
1960 bss_conf->assoc = 1;
1961
1962 /* Tell the driver to monitor connection quality (if supported) */
1963 if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1964 bss_conf->cqm_rssi_thold)
1965 bss_info_changed |= BSS_CHANGED_CQM;
1966
1967 /* Enable ARP filtering */
1968 if (bss_conf->arp_addr_cnt)
1969 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1970
1971 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1972
1973 mutex_lock(&local->iflist_mtx);
1974 ieee80211_recalc_ps(local);
1975 mutex_unlock(&local->iflist_mtx);
1976
1977 ieee80211_recalc_smps(sdata);
1978 ieee80211_recalc_ps_vif(sdata);
1979
1980 netif_carrier_on(sdata->dev);
1981 }
1982
1983 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1984 u16 stype, u16 reason, bool tx,
1985 u8 *frame_buf)
1986 {
1987 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1988 struct ieee80211_local *local = sdata->local;
1989 u32 changed = 0;
1990
1991 sdata_assert_lock(sdata);
1992
1993 if (WARN_ON_ONCE(tx && !frame_buf))
1994 return;
1995
1996 if (WARN_ON(!ifmgd->associated))
1997 return;
1998
1999 ieee80211_stop_poll(sdata);
2000
2001 ifmgd->associated = NULL;
2002 netif_carrier_off(sdata->dev);
2003
2004 /*
2005 * if we want to get out of ps before disassoc (why?) we have
2006 * to do it before sending disassoc, as otherwise the null-packet
2007 * won't be valid.
2008 */
2009 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2010 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2011 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2012 }
2013 local->ps_sdata = NULL;
2014
2015 /* disable per-vif ps */
2016 ieee80211_recalc_ps_vif(sdata);
2017
2018 /* make sure ongoing transmission finishes */
2019 synchronize_net();
2020
2021 /*
2022 * drop any frame before deauth/disassoc, this can be data or
2023 * management frame. Since we are disconnecting, we should not
2024 * insist sending these frames which can take time and delay
2025 * the disconnection and possible the roaming.
2026 */
2027 if (tx)
2028 ieee80211_flush_queues(local, sdata, true);
2029
2030 /* deauthenticate/disassociate now */
2031 if (tx || frame_buf)
2032 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
2033 reason, tx, frame_buf);
2034
2035 /* flush out frame - make sure the deauth was actually sent */
2036 if (tx)
2037 ieee80211_flush_queues(local, sdata, false);
2038
2039 /* clear bssid only after building the needed mgmt frames */
2040 eth_zero_addr(ifmgd->bssid);
2041
2042 /* remove AP and TDLS peers */
2043 sta_info_flush(sdata);
2044
2045 /* finally reset all BSS / config parameters */
2046 changed |= ieee80211_reset_erp_info(sdata);
2047
2048 ieee80211_led_assoc(local, 0);
2049 changed |= BSS_CHANGED_ASSOC;
2050 sdata->vif.bss_conf.assoc = false;
2051
2052 ifmgd->p2p_noa_index = -1;
2053 memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
2054 sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2055
2056 /* on the next assoc, re-program HT/VHT parameters */
2057 memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
2058 memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2059 memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
2060 memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2061
2062 /* reset MU-MIMO ownership and group data */
2063 memset(sdata->vif.bss_conf.mu_group.membership, 0,
2064 sizeof(sdata->vif.bss_conf.mu_group.membership));
2065 memset(sdata->vif.bss_conf.mu_group.position, 0,
2066 sizeof(sdata->vif.bss_conf.mu_group.position));
2067 changed |= BSS_CHANGED_MU_GROUPS;
2068 sdata->vif.mu_mimo_owner = false;
2069
2070 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2071
2072 del_timer_sync(&local->dynamic_ps_timer);
2073 cancel_work_sync(&local->dynamic_ps_enable_work);
2074
2075 /* Disable ARP filtering */
2076 if (sdata->vif.bss_conf.arp_addr_cnt)
2077 changed |= BSS_CHANGED_ARP_FILTER;
2078
2079 sdata->vif.bss_conf.qos = false;
2080 changed |= BSS_CHANGED_QOS;
2081
2082 /* The BSSID (not really interesting) and HT changed */
2083 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
2084 ieee80211_bss_info_change_notify(sdata, changed);
2085
2086 /* disassociated - set to defaults now */
2087 ieee80211_set_wmm_default(sdata, false, false);
2088
2089 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
2090 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
2091 del_timer_sync(&sdata->u.mgd.timer);
2092 del_timer_sync(&sdata->u.mgd.chswitch_timer);
2093
2094 sdata->vif.bss_conf.dtim_period = 0;
2095 sdata->vif.bss_conf.beacon_rate = NULL;
2096
2097 ifmgd->have_beacon = false;
2098
2099 ifmgd->flags = 0;
2100 mutex_lock(&local->mtx);
2101 ieee80211_vif_release_channel(sdata);
2102
2103 sdata->vif.csa_active = false;
2104 ifmgd->csa_waiting_bcn = false;
2105 ifmgd->csa_ignored_same_chan = false;
2106 if (sdata->csa_block_tx) {
2107 ieee80211_wake_vif_queues(local, sdata,
2108 IEEE80211_QUEUE_STOP_REASON_CSA);
2109 sdata->csa_block_tx = false;
2110 }
2111 mutex_unlock(&local->mtx);
2112
2113 /* existing TX TSPEC sessions no longer exist */
2114 memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
2115 cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);
2116
2117 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2118 }
2119
2120 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
2121 struct ieee80211_hdr *hdr)
2122 {
2123 /*
2124 * We can postpone the mgd.timer whenever receiving unicast frames
2125 * from AP because we know that the connection is working both ways
2126 * at that time. But multicast frames (and hence also beacons) must
2127 * be ignored here, because we need to trigger the timer during
2128 * data idle periods for sending the periodic probe request to the
2129 * AP we're connected to.
2130 */
2131 if (is_multicast_ether_addr(hdr->addr1))
2132 return;
2133
2134 ieee80211_sta_reset_conn_monitor(sdata);
2135 }
2136
2137 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
2138 {
2139 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2140 struct ieee80211_local *local = sdata->local;
2141
2142 mutex_lock(&local->mtx);
2143 if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
2144 goto out;
2145
2146 __ieee80211_stop_poll(sdata);
2147
2148 mutex_lock(&local->iflist_mtx);
2149 ieee80211_recalc_ps(local);
2150 mutex_unlock(&local->iflist_mtx);
2151
2152 if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
2153 goto out;
2154
2155 /*
2156 * We've received a probe response, but are not sure whether
2157 * we have or will be receiving any beacons or data, so let's
2158 * schedule the timers again, just in case.
2159 */
2160 ieee80211_sta_reset_beacon_monitor(sdata);
2161
2162 mod_timer(&ifmgd->conn_mon_timer,
2163 round_jiffies_up(jiffies +
2164 IEEE80211_CONNECTION_IDLE_TIME));
2165 out:
2166 mutex_unlock(&local->mtx);
2167 }
2168
2169 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
2170 struct ieee80211_hdr *hdr,
2171 u16 tx_time)
2172 {
2173 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2174 u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2175 int ac = ieee80211_ac_from_tid(tid);
2176 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
2177 unsigned long now = jiffies;
2178
2179 if (likely(!tx_tspec->admitted_time))
2180 return;
2181
2182 if (time_after(now, tx_tspec->time_slice_start + HZ)) {
2183 tx_tspec->consumed_tx_time = 0;
2184 tx_tspec->time_slice_start = now;
2185
2186 if (tx_tspec->downgraded) {
2187 tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE;
2188 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2189 }
2190 }
2191
2192 if (tx_tspec->downgraded)
2193 return;
2194
2195 tx_tspec->consumed_tx_time += tx_time;
2196
2197 if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) {
2198 tx_tspec->downgraded = true;
2199 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE;
2200 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2201 }
2202 }
2203
2204 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2205 struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2206 {
2207 ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);
2208
2209 if (!ieee80211_is_data(hdr->frame_control))
2210 return;
2211
2212 if (ieee80211_is_nullfunc(hdr->frame_control) &&
2213 sdata->u.mgd.probe_send_count > 0) {
2214 if (ack)
2215 ieee80211_sta_reset_conn_monitor(sdata);
2216 else
2217 sdata->u.mgd.nullfunc_failed = true;
2218 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2219 return;
2220 }
2221
2222 if (ack)
2223 ieee80211_sta_reset_conn_monitor(sdata);
2224 }
2225
2226 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
2227 {
2228 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2229 const u8 *ssid;
2230 u8 *dst = ifmgd->associated->bssid;
2231 u8 unicast_limit = max(1, max_probe_tries - 3);
2232 struct sta_info *sta;
2233
2234 /*
2235 * Try sending broadcast probe requests for the last three
2236 * probe requests after the first ones failed since some
2237 * buggy APs only support broadcast probe requests.
2238 */
2239 if (ifmgd->probe_send_count >= unicast_limit)
2240 dst = NULL;
2241
2242 /*
2243 * When the hardware reports an accurate Tx ACK status, it's
2244 * better to send a nullfunc frame instead of a probe request,
2245 * as it will kick us off the AP quickly if we aren't associated
2246 * anymore. The timeout will be reset if the frame is ACKed by
2247 * the AP.
2248 */
2249 ifmgd->probe_send_count++;
2250
2251 if (dst) {
2252 mutex_lock(&sdata->local->sta_mtx);
2253 sta = sta_info_get(sdata, dst);
2254 if (!WARN_ON(!sta))
2255 ieee80211_check_fast_rx(sta);
2256 mutex_unlock(&sdata->local->sta_mtx);
2257 }
2258
2259 if (ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
2260 ifmgd->nullfunc_failed = false;
2261 ieee80211_send_nullfunc(sdata->local, sdata, false);
2262 } else {
2263 int ssid_len;
2264
2265 rcu_read_lock();
2266 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2267 if (WARN_ON_ONCE(ssid == NULL))
2268 ssid_len = 0;
2269 else
2270 ssid_len = ssid[1];
2271
2272 ieee80211_send_probe_req(sdata, sdata->vif.addr, dst,
2273 ssid + 2, ssid_len, NULL,
2274 0, (u32) -1, true, 0,
2275 ifmgd->associated->channel, false);
2276 rcu_read_unlock();
2277 }
2278
2279 ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2280 run_again(sdata, ifmgd->probe_timeout);
2281 }
2282
2283 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
2284 bool beacon)
2285 {
2286 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2287 bool already = false;
2288
2289 if (!ieee80211_sdata_running(sdata))
2290 return;
2291
2292 sdata_lock(sdata);
2293
2294 if (!ifmgd->associated)
2295 goto out;
2296
2297 mutex_lock(&sdata->local->mtx);
2298
2299 if (sdata->local->tmp_channel || sdata->local->scanning) {
2300 mutex_unlock(&sdata->local->mtx);
2301 goto out;
2302 }
2303
2304 if (beacon) {
2305 mlme_dbg_ratelimited(sdata,
2306 "detected beacon loss from AP (missed %d beacons) - probing\n",
2307 beacon_loss_count);
2308
2309 ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL);
2310 }
2311
2312 /*
2313 * The driver/our work has already reported this event or the
2314 * connection monitoring has kicked in and we have already sent
2315 * a probe request. Or maybe the AP died and the driver keeps
2316 * reporting until we disassociate...
2317 *
2318 * In either case we have to ignore the current call to this
2319 * function (except for setting the correct probe reason bit)
2320 * because otherwise we would reset the timer every time and
2321 * never check whether we received a probe response!
2322 */
2323 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
2324 already = true;
2325
2326 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2327
2328 mutex_unlock(&sdata->local->mtx);
2329
2330 if (already)
2331 goto out;
2332
2333 mutex_lock(&sdata->local->iflist_mtx);
2334 ieee80211_recalc_ps(sdata->local);
2335 mutex_unlock(&sdata->local->iflist_mtx);
2336
2337 ifmgd->probe_send_count = 0;
2338 ieee80211_mgd_probe_ap_send(sdata);
2339 out:
2340 sdata_unlock(sdata);
2341 }
2342
2343 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2344 struct ieee80211_vif *vif)
2345 {
2346 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2347 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2348 struct cfg80211_bss *cbss;
2349 struct sk_buff *skb;
2350 const u8 *ssid;
2351 int ssid_len;
2352
2353 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2354 return NULL;
2355
2356 sdata_assert_lock(sdata);
2357
2358 if (ifmgd->associated)
2359 cbss = ifmgd->associated;
2360 else if (ifmgd->auth_data)
2361 cbss = ifmgd->auth_data->bss;
2362 else if (ifmgd->assoc_data)
2363 cbss = ifmgd->assoc_data->bss;
2364 else
2365 return NULL;
2366
2367 rcu_read_lock();
2368 ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2369 if (WARN_ON_ONCE(ssid == NULL))
2370 ssid_len = 0;
2371 else
2372 ssid_len = ssid[1];
2373
2374 skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
2375 (u32) -1, cbss->channel,
2376 ssid + 2, ssid_len,
2377 NULL, 0, true);
2378 rcu_read_unlock();
2379
2380 return skb;
2381 }
2382 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2383
2384 static void ieee80211_report_disconnect(struct ieee80211_sub_if_data *sdata,
2385 const u8 *buf, size_t len, bool tx,
2386 u16 reason)
2387 {
2388 struct ieee80211_event event = {
2389 .type = MLME_EVENT,
2390 .u.mlme.data = tx ? DEAUTH_TX_EVENT : DEAUTH_RX_EVENT,
2391 .u.mlme.reason = reason,
2392 };
2393
2394 if (tx)
2395 cfg80211_tx_mlme_mgmt(sdata->dev, buf, len);
2396 else
2397 cfg80211_rx_mlme_mgmt(sdata->dev, buf, len);
2398
2399 drv_event_callback(sdata->local, sdata, &event);
2400 }
2401
2402 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2403 {
2404 struct ieee80211_local *local = sdata->local;
2405 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2406 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2407
2408 sdata_lock(sdata);
2409 if (!ifmgd->associated) {
2410 sdata_unlock(sdata);
2411 return;
2412 }
2413
2414 /* AP is probably out of range (or not reachable for another reason) so
2415 * remove the bss struct for that AP.
2416 */
2417 cfg80211_unlink_bss(local->hw.wiphy, ifmgd->associated);
2418
2419 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2420 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2421 true, frame_buf);
2422 mutex_lock(&local->mtx);
2423 sdata->vif.csa_active = false;
2424 ifmgd->csa_waiting_bcn = false;
2425 if (sdata->csa_block_tx) {
2426 ieee80211_wake_vif_queues(local, sdata,
2427 IEEE80211_QUEUE_STOP_REASON_CSA);
2428 sdata->csa_block_tx = false;
2429 }
2430 mutex_unlock(&local->mtx);
2431
2432 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
2433 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2434
2435 sdata_unlock(sdata);
2436 }
2437
2438 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2439 {
2440 struct ieee80211_sub_if_data *sdata =
2441 container_of(work, struct ieee80211_sub_if_data,
2442 u.mgd.beacon_connection_loss_work);
2443 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2444
2445 if (ifmgd->associated)
2446 ifmgd->beacon_loss_count++;
2447
2448 if (ifmgd->connection_loss) {
2449 sdata_info(sdata, "Connection to AP %pM lost\n",
2450 ifmgd->bssid);
2451 __ieee80211_disconnect(sdata);
2452 } else {
2453 ieee80211_mgd_probe_ap(sdata, true);
2454 }
2455 }
2456
2457 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2458 {
2459 struct ieee80211_sub_if_data *sdata =
2460 container_of(work, struct ieee80211_sub_if_data,
2461 u.mgd.csa_connection_drop_work);
2462
2463 __ieee80211_disconnect(sdata);
2464 }
2465
2466 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2467 {
2468 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2469 struct ieee80211_hw *hw = &sdata->local->hw;
2470
2471 trace_api_beacon_loss(sdata);
2472
2473 sdata->u.mgd.connection_loss = false;
2474 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2475 }
2476 EXPORT_SYMBOL(ieee80211_beacon_loss);
2477
2478 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2479 {
2480 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2481 struct ieee80211_hw *hw = &sdata->local->hw;
2482
2483 trace_api_connection_loss(sdata);
2484
2485 sdata->u.mgd.connection_loss = true;
2486 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2487 }
2488 EXPORT_SYMBOL(ieee80211_connection_loss);
2489
2490
2491 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2492 bool assoc)
2493 {
2494 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2495
2496 sdata_assert_lock(sdata);
2497
2498 if (!assoc) {
2499 /*
2500 * we are not authenticated yet, the only timer that could be
2501 * running is the timeout for the authentication response which
2502 * which is not relevant anymore.
2503 */
2504 del_timer_sync(&sdata->u.mgd.timer);
2505 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2506
2507 eth_zero_addr(sdata->u.mgd.bssid);
2508 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2509 sdata->u.mgd.flags = 0;
2510 mutex_lock(&sdata->local->mtx);
2511 ieee80211_vif_release_channel(sdata);
2512 mutex_unlock(&sdata->local->mtx);
2513 }
2514
2515 cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2516 kfree(auth_data);
2517 sdata->u.mgd.auth_data = NULL;
2518 }
2519
2520 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2521 bool assoc, bool abandon)
2522 {
2523 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2524
2525 sdata_assert_lock(sdata);
2526
2527 if (!assoc) {
2528 /*
2529 * we are not associated yet, the only timer that could be
2530 * running is the timeout for the association response which
2531 * which is not relevant anymore.
2532 */
2533 del_timer_sync(&sdata->u.mgd.timer);
2534 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2535
2536 eth_zero_addr(sdata->u.mgd.bssid);
2537 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2538 sdata->u.mgd.flags = 0;
2539 sdata->vif.mu_mimo_owner = false;
2540
2541 mutex_lock(&sdata->local->mtx);
2542 ieee80211_vif_release_channel(sdata);
2543 mutex_unlock(&sdata->local->mtx);
2544
2545 if (abandon)
2546 cfg80211_abandon_assoc(sdata->dev, assoc_data->bss);
2547 }
2548
2549 kfree(assoc_data);
2550 sdata->u.mgd.assoc_data = NULL;
2551 }
2552
2553 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2554 struct ieee80211_mgmt *mgmt, size_t len)
2555 {
2556 struct ieee80211_local *local = sdata->local;
2557 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2558 u8 *pos;
2559 struct ieee802_11_elems elems;
2560 u32 tx_flags = 0;
2561
2562 pos = mgmt->u.auth.variable;
2563 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2564 if (!elems.challenge)
2565 return;
2566 auth_data->expected_transaction = 4;
2567 drv_mgd_prepare_tx(sdata->local, sdata);
2568 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
2569 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2570 IEEE80211_TX_INTFL_MLME_CONN_TX;
2571 ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2572 elems.challenge - 2, elems.challenge_len + 2,
2573 auth_data->bss->bssid, auth_data->bss->bssid,
2574 auth_data->key, auth_data->key_len,
2575 auth_data->key_idx, tx_flags);
2576 }
2577
2578 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2579 struct ieee80211_mgmt *mgmt, size_t len)
2580 {
2581 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2582 u8 bssid[ETH_ALEN];
2583 u16 auth_alg, auth_transaction, status_code;
2584 struct sta_info *sta;
2585 struct ieee80211_event event = {
2586 .type = MLME_EVENT,
2587 .u.mlme.data = AUTH_EVENT,
2588 };
2589
2590 sdata_assert_lock(sdata);
2591
2592 if (len < 24 + 6)
2593 return;
2594
2595 if (!ifmgd->auth_data || ifmgd->auth_data->done)
2596 return;
2597
2598 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2599
2600 if (!ether_addr_equal(bssid, mgmt->bssid))
2601 return;
2602
2603 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2604 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2605 status_code = le16_to_cpu(mgmt->u.auth.status_code);
2606
2607 if (auth_alg != ifmgd->auth_data->algorithm ||
2608 auth_transaction != ifmgd->auth_data->expected_transaction) {
2609 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2610 mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2611 auth_transaction,
2612 ifmgd->auth_data->expected_transaction);
2613 return;
2614 }
2615
2616 if (status_code != WLAN_STATUS_SUCCESS) {
2617 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2618 mgmt->sa, status_code);
2619 ieee80211_destroy_auth_data(sdata, false);
2620 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2621 event.u.mlme.status = MLME_DENIED;
2622 event.u.mlme.reason = status_code;
2623 drv_event_callback(sdata->local, sdata, &event);
2624 return;
2625 }
2626
2627 switch (ifmgd->auth_data->algorithm) {
2628 case WLAN_AUTH_OPEN:
2629 case WLAN_AUTH_LEAP:
2630 case WLAN_AUTH_FT:
2631 case WLAN_AUTH_SAE:
2632 case WLAN_AUTH_FILS_SK:
2633 case WLAN_AUTH_FILS_SK_PFS:
2634 case WLAN_AUTH_FILS_PK:
2635 break;
2636 case WLAN_AUTH_SHARED_KEY:
2637 if (ifmgd->auth_data->expected_transaction != 4) {
2638 ieee80211_auth_challenge(sdata, mgmt, len);
2639 /* need another frame */
2640 return;
2641 }
2642 break;
2643 default:
2644 WARN_ONCE(1, "invalid auth alg %d",
2645 ifmgd->auth_data->algorithm);
2646 return;
2647 }
2648
2649 event.u.mlme.status = MLME_SUCCESS;
2650 drv_event_callback(sdata->local, sdata, &event);
2651 sdata_info(sdata, "authenticated\n");
2652 ifmgd->auth_data->done = true;
2653 ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2654 ifmgd->auth_data->timeout_started = true;
2655 run_again(sdata, ifmgd->auth_data->timeout);
2656
2657 if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2658 ifmgd->auth_data->expected_transaction != 2) {
2659 /*
2660 * Report auth frame to user space for processing since another
2661 * round of Authentication frames is still needed.
2662 */
2663 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2664 return;
2665 }
2666
2667 /* move station state to auth */
2668 mutex_lock(&sdata->local->sta_mtx);
2669 sta = sta_info_get(sdata, bssid);
2670 if (!sta) {
2671 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2672 goto out_err;
2673 }
2674 if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2675 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2676 goto out_err;
2677 }
2678 mutex_unlock(&sdata->local->sta_mtx);
2679
2680 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2681 return;
2682 out_err:
2683 mutex_unlock(&sdata->local->sta_mtx);
2684 /* ignore frame -- wait for timeout */
2685 }
2686
2687 #define case_WLAN(type) \
2688 case WLAN_REASON_##type: return #type
2689
2690 static const char *ieee80211_get_reason_code_string(u16 reason_code)
2691 {
2692 switch (reason_code) {
2693 case_WLAN(UNSPECIFIED);
2694 case_WLAN(PREV_AUTH_NOT_VALID);
2695 case_WLAN(DEAUTH_LEAVING);
2696 case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2697 case_WLAN(DISASSOC_AP_BUSY);
2698 case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2699 case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2700 case_WLAN(DISASSOC_STA_HAS_LEFT);
2701 case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2702 case_WLAN(DISASSOC_BAD_POWER);
2703 case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2704 case_WLAN(INVALID_IE);
2705 case_WLAN(MIC_FAILURE);
2706 case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2707 case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2708 case_WLAN(IE_DIFFERENT);
2709 case_WLAN(INVALID_GROUP_CIPHER);
2710 case_WLAN(INVALID_PAIRWISE_CIPHER);
2711 case_WLAN(INVALID_AKMP);
2712 case_WLAN(UNSUPP_RSN_VERSION);
2713 case_WLAN(INVALID_RSN_IE_CAP);
2714 case_WLAN(IEEE8021X_FAILED);
2715 case_WLAN(CIPHER_SUITE_REJECTED);
2716 case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2717 case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2718 case_WLAN(DISASSOC_LOW_ACK);
2719 case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2720 case_WLAN(QSTA_LEAVE_QBSS);
2721 case_WLAN(QSTA_NOT_USE);
2722 case_WLAN(QSTA_REQUIRE_SETUP);
2723 case_WLAN(QSTA_TIMEOUT);
2724 case_WLAN(QSTA_CIPHER_NOT_SUPP);
2725 case_WLAN(MESH_PEER_CANCELED);
2726 case_WLAN(MESH_MAX_PEERS);
2727 case_WLAN(MESH_CONFIG);
2728 case_WLAN(MESH_CLOSE);
2729 case_WLAN(MESH_MAX_RETRIES);
2730 case_WLAN(MESH_CONFIRM_TIMEOUT);
2731 case_WLAN(MESH_INVALID_GTK);
2732 case_WLAN(MESH_INCONSISTENT_PARAM);
2733 case_WLAN(MESH_INVALID_SECURITY);
2734 case_WLAN(MESH_PATH_ERROR);
2735 case_WLAN(MESH_PATH_NOFORWARD);
2736 case_WLAN(MESH_PATH_DEST_UNREACHABLE);
2737 case_WLAN(MAC_EXISTS_IN_MBSS);
2738 case_WLAN(MESH_CHAN_REGULATORY);
2739 case_WLAN(MESH_CHAN);
2740 default: return "<unknown>";
2741 }
2742 }
2743
2744 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2745 struct ieee80211_mgmt *mgmt, size_t len)
2746 {
2747 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2748 u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2749
2750 sdata_assert_lock(sdata);
2751
2752 if (len < 24 + 2)
2753 return;
2754
2755 if (ifmgd->associated &&
2756 ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) {
2757 const u8 *bssid = ifmgd->associated->bssid;
2758
2759 sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
2760 bssid, reason_code,
2761 ieee80211_get_reason_code_string(reason_code));
2762
2763 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2764
2765 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false,
2766 reason_code);
2767 return;
2768 }
2769
2770 if (ifmgd->assoc_data &&
2771 ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2772 const u8 *bssid = ifmgd->assoc_data->bss->bssid;
2773
2774 sdata_info(sdata,
2775 "deauthenticated from %pM while associating (Reason: %u=%s)\n",
2776 bssid, reason_code,
2777 ieee80211_get_reason_code_string(reason_code));
2778
2779 ieee80211_destroy_assoc_data(sdata, false, true);
2780
2781 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2782 return;
2783 }
2784 }
2785
2786
2787 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2788 struct ieee80211_mgmt *mgmt, size_t len)
2789 {
2790 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2791 u16 reason_code;
2792
2793 sdata_assert_lock(sdata);
2794
2795 if (len < 24 + 2)
2796 return;
2797
2798 if (!ifmgd->associated ||
2799 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2800 return;
2801
2802 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2803
2804 sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2805 mgmt->sa, reason_code);
2806
2807 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2808
2809 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code);
2810 }
2811
2812 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2813 u8 *supp_rates, unsigned int supp_rates_len,
2814 u32 *rates, u32 *basic_rates,
2815 bool *have_higher_than_11mbit,
2816 int *min_rate, int *min_rate_index,
2817 int shift, u32 rate_flags)
2818 {
2819 int i, j;
2820
2821 for (i = 0; i < supp_rates_len; i++) {
2822 int rate = supp_rates[i] & 0x7f;
2823 bool is_basic = !!(supp_rates[i] & 0x80);
2824
2825 if ((rate * 5 * (1 << shift)) > 110)
2826 *have_higher_than_11mbit = true;
2827
2828 /*
2829 * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2830 * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2831 *
2832 * Note: Even through the membership selector and the basic
2833 * rate flag share the same bit, they are not exactly
2834 * the same.
2835 */
2836 if (!!(supp_rates[i] & 0x80) &&
2837 (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2838 continue;
2839
2840 for (j = 0; j < sband->n_bitrates; j++) {
2841 struct ieee80211_rate *br;
2842 int brate;
2843
2844 br = &sband->bitrates[j];
2845 if ((rate_flags & br->flags) != rate_flags)
2846 continue;
2847
2848 brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2849 if (brate == rate) {
2850 *rates |= BIT(j);
2851 if (is_basic)
2852 *basic_rates |= BIT(j);
2853 if ((rate * 5) < *min_rate) {
2854 *min_rate = rate * 5;
2855 *min_rate_index = j;
2856 }
2857 break;
2858 }
2859 }
2860 }
2861 }
2862
2863 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2864 struct cfg80211_bss *cbss,
2865 struct ieee80211_mgmt *mgmt, size_t len)
2866 {
2867 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2868 struct ieee80211_local *local = sdata->local;
2869 struct ieee80211_supported_band *sband;
2870 struct sta_info *sta;
2871 u8 *pos;
2872 u16 capab_info, aid;
2873 struct ieee802_11_elems elems;
2874 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2875 const struct cfg80211_bss_ies *bss_ies = NULL;
2876 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2877 u32 changed = 0;
2878 int err;
2879 bool ret;
2880
2881 /* AssocResp and ReassocResp have identical structure */
2882
2883 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2884 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2885
2886 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2887 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2888 aid);
2889 aid &= ~(BIT(15) | BIT(14));
2890
2891 ifmgd->broken_ap = false;
2892
2893 if (aid == 0 || aid > IEEE80211_MAX_AID) {
2894 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2895 aid);
2896 aid = 0;
2897 ifmgd->broken_ap = true;
2898 }
2899
2900 pos = mgmt->u.assoc_resp.variable;
2901 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2902
2903 if (!elems.supp_rates) {
2904 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2905 return false;
2906 }
2907
2908 ifmgd->aid = aid;
2909 ifmgd->tdls_chan_switch_prohibited =
2910 elems.ext_capab && elems.ext_capab_len >= 5 &&
2911 (elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
2912
2913 /*
2914 * Some APs are erroneously not including some information in their
2915 * (re)association response frames. Try to recover by using the data
2916 * from the beacon or probe response. This seems to afflict mobile
2917 * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2918 * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2919 */
2920 if ((assoc_data->wmm && !elems.wmm_param) ||
2921 (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2922 (!elems.ht_cap_elem || !elems.ht_operation)) ||
2923 (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2924 (!elems.vht_cap_elem || !elems.vht_operation))) {
2925 const struct cfg80211_bss_ies *ies;
2926 struct ieee802_11_elems bss_elems;
2927
2928 rcu_read_lock();
2929 ies = rcu_dereference(cbss->ies);
2930 if (ies)
2931 bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2932 GFP_ATOMIC);
2933 rcu_read_unlock();
2934 if (!bss_ies)
2935 return false;
2936
2937 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2938 false, &bss_elems);
2939 if (assoc_data->wmm &&
2940 !elems.wmm_param && bss_elems.wmm_param) {
2941 elems.wmm_param = bss_elems.wmm_param;
2942 sdata_info(sdata,
2943 "AP bug: WMM param missing from AssocResp\n");
2944 }
2945
2946 /*
2947 * Also check if we requested HT/VHT, otherwise the AP doesn't
2948 * have to include the IEs in the (re)association response.
2949 */
2950 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2951 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2952 elems.ht_cap_elem = bss_elems.ht_cap_elem;
2953 sdata_info(sdata,
2954 "AP bug: HT capability missing from AssocResp\n");
2955 }
2956 if (!elems.ht_operation && bss_elems.ht_operation &&
2957 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2958 elems.ht_operation = bss_elems.ht_operation;
2959 sdata_info(sdata,
2960 "AP bug: HT operation missing from AssocResp\n");
2961 }
2962 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2963 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2964 elems.vht_cap_elem = bss_elems.vht_cap_elem;
2965 sdata_info(sdata,
2966 "AP bug: VHT capa missing from AssocResp\n");
2967 }
2968 if (!elems.vht_operation && bss_elems.vht_operation &&
2969 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2970 elems.vht_operation = bss_elems.vht_operation;
2971 sdata_info(sdata,
2972 "AP bug: VHT operation missing from AssocResp\n");
2973 }
2974 }
2975
2976 /*
2977 * We previously checked these in the beacon/probe response, so
2978 * they should be present here. This is just a safety net.
2979 */
2980 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2981 (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2982 sdata_info(sdata,
2983 "HT AP is missing WMM params or HT capability/operation\n");
2984 ret = false;
2985 goto out;
2986 }
2987
2988 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2989 (!elems.vht_cap_elem || !elems.vht_operation)) {
2990 sdata_info(sdata,
2991 "VHT AP is missing VHT capability/operation\n");
2992 ret = false;
2993 goto out;
2994 }
2995
2996 mutex_lock(&sdata->local->sta_mtx);
2997 /*
2998 * station info was already allocated and inserted before
2999 * the association and should be available to us
3000 */
3001 sta = sta_info_get(sdata, cbss->bssid);
3002 if (WARN_ON(!sta)) {
3003 mutex_unlock(&sdata->local->sta_mtx);
3004 ret = false;
3005 goto out;
3006 }
3007
3008 sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
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 /* set AID and assoc capability,
3093 * ieee80211_set_associated() will tell the driver */
3094 bss_conf->aid = aid;
3095 bss_conf->assoc_capability = capab_info;
3096 ieee80211_set_associated(sdata, cbss, changed);
3097
3098 /*
3099 * If we're using 4-addr mode, let the AP know that we're
3100 * doing so, so that it can create the STA VLAN on its side
3101 */
3102 if (ifmgd->use_4addr)
3103 ieee80211_send_4addr_nullfunc(local, sdata);
3104
3105 /*
3106 * Start timer to probe the connection to the AP now.
3107 * Also start the timer that will detect beacon loss.
3108 */
3109 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
3110 ieee80211_sta_reset_beacon_monitor(sdata);
3111
3112 ret = true;
3113 out:
3114 kfree(bss_ies);
3115 return ret;
3116 }
3117
3118 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
3119 struct ieee80211_mgmt *mgmt,
3120 size_t len)
3121 {
3122 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3123 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
3124 u16 capab_info, status_code, aid;
3125 struct ieee802_11_elems elems;
3126 int ac, uapsd_queues = -1;
3127 u8 *pos;
3128 bool reassoc;
3129 struct cfg80211_bss *bss;
3130 struct ieee80211_event event = {
3131 .type = MLME_EVENT,
3132 .u.mlme.data = ASSOC_EVENT,
3133 };
3134
3135 sdata_assert_lock(sdata);
3136
3137 if (!assoc_data)
3138 return;
3139 if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3140 return;
3141
3142 /*
3143 * AssocResp and ReassocResp have identical structure, so process both
3144 * of them in this function.
3145 */
3146
3147 if (len < 24 + 6)
3148 return;
3149
3150 reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
3151 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
3152 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
3153 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
3154
3155 sdata_info(sdata,
3156 "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
3157 reassoc ? "Rea" : "A", mgmt->sa,
3158 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
3159
3160 if (assoc_data->fils_kek_len &&
3161 fils_decrypt_assoc_resp(sdata, (u8 *)mgmt, &len, assoc_data) < 0)
3162 return;
3163
3164 pos = mgmt->u.assoc_resp.variable;
3165 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
3166
3167 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3168 elems.timeout_int &&
3169 elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
3170 u32 tu, ms;
3171 tu = le32_to_cpu(elems.timeout_int->value);
3172 ms = tu * 1024 / 1000;
3173 sdata_info(sdata,
3174 "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
3175 mgmt->sa, tu, ms);
3176 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3177 assoc_data->timeout_started = true;
3178 if (ms > IEEE80211_ASSOC_TIMEOUT)
3179 run_again(sdata, assoc_data->timeout);
3180 return;
3181 }
3182
3183 bss = assoc_data->bss;
3184
3185 if (status_code != WLAN_STATUS_SUCCESS) {
3186 sdata_info(sdata, "%pM denied association (code=%d)\n",
3187 mgmt->sa, status_code);
3188 ieee80211_destroy_assoc_data(sdata, false, false);
3189 event.u.mlme.status = MLME_DENIED;
3190 event.u.mlme.reason = status_code;
3191 drv_event_callback(sdata->local, sdata, &event);
3192 } else {
3193 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
3194 /* oops -- internal error -- send timeout for now */
3195 ieee80211_destroy_assoc_data(sdata, false, false);
3196 cfg80211_assoc_timeout(sdata->dev, bss);
3197 return;
3198 }
3199 event.u.mlme.status = MLME_SUCCESS;
3200 drv_event_callback(sdata->local, sdata, &event);
3201 sdata_info(sdata, "associated\n");
3202
3203 /*
3204 * destroy assoc_data afterwards, as otherwise an idle
3205 * recalc after assoc_data is NULL but before associated
3206 * is set can cause the interface to go idle
3207 */
3208 ieee80211_destroy_assoc_data(sdata, true, false);
3209
3210 /* get uapsd queues configuration */
3211 uapsd_queues = 0;
3212 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
3213 if (sdata->tx_conf[ac].uapsd)
3214 uapsd_queues |= ieee80211_ac_to_qos_mask[ac];
3215 }
3216
3217 cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
3218 }
3219
3220 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
3221 struct ieee80211_mgmt *mgmt, size_t len,
3222 struct ieee80211_rx_status *rx_status,
3223 struct ieee802_11_elems *elems)
3224 {
3225 struct ieee80211_local *local = sdata->local;
3226 struct ieee80211_bss *bss;
3227 struct ieee80211_channel *channel;
3228
3229 sdata_assert_lock(sdata);
3230
3231 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
3232 if (!channel)
3233 return;
3234
3235 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3236 channel);
3237 if (bss) {
3238 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3239 ieee80211_rx_bss_put(local, bss);
3240 }
3241 }
3242
3243
3244 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
3245 struct sk_buff *skb)
3246 {
3247 struct ieee80211_mgmt *mgmt = (void *)skb->data;
3248 struct ieee80211_if_managed *ifmgd;
3249 struct ieee80211_rx_status *rx_status = (void *) skb->cb;
3250 size_t baselen, len = skb->len;
3251 struct ieee802_11_elems elems;
3252
3253 ifmgd = &sdata->u.mgd;
3254
3255 sdata_assert_lock(sdata);
3256
3257 if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3258 return; /* ignore ProbeResp to foreign address */
3259
3260 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
3261 if (baselen > len)
3262 return;
3263
3264 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3265 false, &elems);
3266
3267 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3268
3269 if (ifmgd->associated &&
3270 ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3271 ieee80211_reset_ap_probe(sdata);
3272 }
3273
3274 /*
3275 * This is the canonical list of information elements we care about,
3276 * the filter code also gives us all changes to the Microsoft OUI
3277 * (00:50:F2) vendor IE which is used for WMM which we need to track,
3278 * as well as the DTPC IE (part of the Cisco OUI) used for signaling
3279 * changes to requested client power.
3280 *
3281 * We implement beacon filtering in software since that means we can
3282 * avoid processing the frame here and in cfg80211, and userspace
3283 * will not be able to tell whether the hardware supports it or not.
3284 *
3285 * XXX: This list needs to be dynamic -- userspace needs to be able to
3286 * add items it requires. It also needs to be able to tell us to
3287 * look out for other vendor IEs.
3288 */
3289 static const u64 care_about_ies =
3290 (1ULL << WLAN_EID_COUNTRY) |
3291 (1ULL << WLAN_EID_ERP_INFO) |
3292 (1ULL << WLAN_EID_CHANNEL_SWITCH) |
3293 (1ULL << WLAN_EID_PWR_CONSTRAINT) |
3294 (1ULL << WLAN_EID_HT_CAPABILITY) |
3295 (1ULL << WLAN_EID_HT_OPERATION) |
3296 (1ULL << WLAN_EID_EXT_CHANSWITCH_ANN);
3297
3298 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
3299 struct ieee80211_mgmt *mgmt, size_t len,
3300 struct ieee80211_rx_status *rx_status)
3301 {
3302 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3303 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3304 size_t baselen;
3305 struct ieee802_11_elems elems;
3306 struct ieee80211_local *local = sdata->local;
3307 struct ieee80211_chanctx_conf *chanctx_conf;
3308 struct ieee80211_channel *chan;
3309 struct sta_info *sta;
3310 u32 changed = 0;
3311 bool erp_valid;
3312 u8 erp_value = 0;
3313 u32 ncrc;
3314 u8 *bssid;
3315 u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3316
3317 sdata_assert_lock(sdata);
3318
3319 /* Process beacon from the current BSS */
3320 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
3321 if (baselen > len)
3322 return;
3323
3324 rcu_read_lock();
3325 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3326 if (!chanctx_conf) {
3327 rcu_read_unlock();
3328 return;
3329 }
3330
3331 if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
3332 rcu_read_unlock();
3333 return;
3334 }
3335 chan = chanctx_conf->def.chan;
3336 rcu_read_unlock();
3337
3338 if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3339 ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
3340 ieee802_11_parse_elems(mgmt->u.beacon.variable,
3341 len - baselen, false, &elems);
3342
3343 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3344 if (elems.tim && !elems.parse_error) {
3345 const struct ieee80211_tim_ie *tim_ie = elems.tim;
3346 ifmgd->dtim_period = tim_ie->dtim_period;
3347 }
3348 ifmgd->have_beacon = true;
3349 ifmgd->assoc_data->need_beacon = false;
3350 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3351 sdata->vif.bss_conf.sync_tsf =
3352 le64_to_cpu(mgmt->u.beacon.timestamp);
3353 sdata->vif.bss_conf.sync_device_ts =
3354 rx_status->device_timestamp;
3355 if (elems.tim)
3356 sdata->vif.bss_conf.sync_dtim_count =
3357 elems.tim->dtim_count;
3358 else
3359 sdata->vif.bss_conf.sync_dtim_count = 0;
3360 }
3361 /* continue assoc process */
3362 ifmgd->assoc_data->timeout = jiffies;
3363 ifmgd->assoc_data->timeout_started = true;
3364 run_again(sdata, ifmgd->assoc_data->timeout);
3365 return;
3366 }
3367
3368 if (!ifmgd->associated ||
3369 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3370 return;
3371 bssid = ifmgd->associated->bssid;
3372
3373 /* Track average RSSI from the Beacon frames of the current AP */
3374 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
3375 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3376 ewma_beacon_signal_init(&ifmgd->ave_beacon_signal);
3377 ifmgd->last_cqm_event_signal = 0;
3378 ifmgd->count_beacon_signal = 1;
3379 ifmgd->last_ave_beacon_signal = 0;
3380 } else {
3381 ifmgd->count_beacon_signal++;
3382 }
3383
3384 ewma_beacon_signal_add(&ifmgd->ave_beacon_signal, -rx_status->signal);
3385
3386 if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3387 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3388 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3389 int last_sig = ifmgd->last_ave_beacon_signal;
3390 struct ieee80211_event event = {
3391 .type = RSSI_EVENT,
3392 };
3393
3394 /*
3395 * if signal crosses either of the boundaries, invoke callback
3396 * with appropriate parameters
3397 */
3398 if (sig > ifmgd->rssi_max_thold &&
3399 (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3400 ifmgd->last_ave_beacon_signal = sig;
3401 event.u.rssi.data = RSSI_EVENT_HIGH;
3402 drv_event_callback(local, sdata, &event);
3403 } else if (sig < ifmgd->rssi_min_thold &&
3404 (last_sig >= ifmgd->rssi_max_thold ||
3405 last_sig == 0)) {
3406 ifmgd->last_ave_beacon_signal = sig;
3407 event.u.rssi.data = RSSI_EVENT_LOW;
3408 drv_event_callback(local, sdata, &event);
3409 }
3410 }
3411
3412 if (bss_conf->cqm_rssi_thold &&
3413 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3414 !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3415 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3416 int last_event = ifmgd->last_cqm_event_signal;
3417 int thold = bss_conf->cqm_rssi_thold;
3418 int hyst = bss_conf->cqm_rssi_hyst;
3419
3420 if (sig < thold &&
3421 (last_event == 0 || sig < last_event - hyst)) {
3422 ifmgd->last_cqm_event_signal = sig;
3423 ieee80211_cqm_rssi_notify(
3424 &sdata->vif,
3425 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3426 GFP_KERNEL);
3427 } else if (sig > thold &&
3428 (last_event == 0 || sig > last_event + hyst)) {
3429 ifmgd->last_cqm_event_signal = sig;
3430 ieee80211_cqm_rssi_notify(
3431 &sdata->vif,
3432 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3433 GFP_KERNEL);
3434 }
3435 }
3436
3437 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3438 mlme_dbg_ratelimited(sdata,
3439 "cancelling AP probe due to a received beacon\n");
3440 ieee80211_reset_ap_probe(sdata);
3441 }
3442
3443 /*
3444 * Push the beacon loss detection into the future since
3445 * we are processing a beacon from the AP just now.
3446 */
3447 ieee80211_sta_reset_beacon_monitor(sdata);
3448
3449 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3450 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3451 len - baselen, false, &elems,
3452 care_about_ies, ncrc);
3453
3454 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
3455 ieee80211_check_tim(elems.tim, elems.tim_len, ifmgd->aid)) {
3456 if (local->hw.conf.dynamic_ps_timeout > 0) {
3457 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3458 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3459 ieee80211_hw_config(local,
3460 IEEE80211_CONF_CHANGE_PS);
3461 }
3462 ieee80211_send_nullfunc(local, sdata, false);
3463 } else if (!local->pspolling && sdata->u.mgd.powersave) {
3464 local->pspolling = true;
3465
3466 /*
3467 * Here is assumed that the driver will be
3468 * able to send ps-poll frame and receive a
3469 * response even though power save mode is
3470 * enabled, but some drivers might require
3471 * to disable power save here. This needs
3472 * to be investigated.
3473 */
3474 ieee80211_send_pspoll(local, sdata);
3475 }
3476 }
3477
3478 if (sdata->vif.p2p ||
3479 sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) {
3480 struct ieee80211_p2p_noa_attr noa = {};
3481 int ret;
3482
3483 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3484 len - baselen,
3485 IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3486 (u8 *) &noa, sizeof(noa));
3487 if (ret >= 2) {
3488 if (sdata->u.mgd.p2p_noa_index != noa.index) {
3489 /* valid noa_attr and index changed */
3490 sdata->u.mgd.p2p_noa_index = noa.index;
3491 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3492 changed |= BSS_CHANGED_P2P_PS;
3493 /*
3494 * make sure we update all information, the CRC
3495 * mechanism doesn't look at P2P attributes.
3496 */
3497 ifmgd->beacon_crc_valid = false;
3498 }
3499 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3500 /* noa_attr not found and we had valid noa_attr before */
3501 sdata->u.mgd.p2p_noa_index = -1;
3502 memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3503 changed |= BSS_CHANGED_P2P_PS;
3504 ifmgd->beacon_crc_valid = false;
3505 }
3506 }
3507
3508 if (ifmgd->csa_waiting_bcn)
3509 ieee80211_chswitch_post_beacon(sdata);
3510
3511 /*
3512 * Update beacon timing and dtim count on every beacon appearance. This
3513 * will allow the driver to use the most updated values. Do it before
3514 * comparing this one with last received beacon.
3515 * IMPORTANT: These parameters would possibly be out of sync by the time
3516 * the driver will use them. The synchronized view is currently
3517 * guaranteed only in certain callbacks.
3518 */
3519 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3520 sdata->vif.bss_conf.sync_tsf =
3521 le64_to_cpu(mgmt->u.beacon.timestamp);
3522 sdata->vif.bss_conf.sync_device_ts =
3523 rx_status->device_timestamp;
3524 if (elems.tim)
3525 sdata->vif.bss_conf.sync_dtim_count =
3526 elems.tim->dtim_count;
3527 else
3528 sdata->vif.bss_conf.sync_dtim_count = 0;
3529 }
3530
3531 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3532 return;
3533 ifmgd->beacon_crc = ncrc;
3534 ifmgd->beacon_crc_valid = true;
3535
3536 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3537
3538 ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3539 rx_status->device_timestamp,
3540 &elems, true);
3541
3542 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3543 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3544 elems.wmm_param_len))
3545 changed |= BSS_CHANGED_QOS;
3546
3547 /*
3548 * If we haven't had a beacon before, tell the driver about the
3549 * DTIM period (and beacon timing if desired) now.
3550 */
3551 if (!ifmgd->have_beacon) {
3552 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3553 if (elems.tim)
3554 bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3555 else
3556 bss_conf->dtim_period = 1;
3557
3558 changed |= BSS_CHANGED_BEACON_INFO;
3559 ifmgd->have_beacon = true;
3560
3561 mutex_lock(&local->iflist_mtx);
3562 ieee80211_recalc_ps(local);
3563 mutex_unlock(&local->iflist_mtx);
3564
3565 ieee80211_recalc_ps_vif(sdata);
3566 }
3567
3568 if (elems.erp_info) {
3569 erp_valid = true;
3570 erp_value = elems.erp_info[0];
3571 } else {
3572 erp_valid = false;
3573 }
3574 changed |= ieee80211_handle_bss_capability(sdata,
3575 le16_to_cpu(mgmt->u.beacon.capab_info),
3576 erp_valid, erp_value);
3577
3578 mutex_lock(&local->sta_mtx);
3579 sta = sta_info_get(sdata, bssid);
3580
3581 if (ieee80211_config_bw(sdata, sta,
3582 elems.ht_cap_elem, elems.ht_operation,
3583 elems.vht_operation, bssid, &changed)) {
3584 mutex_unlock(&local->sta_mtx);
3585 sdata_info(sdata,
3586 "failed to follow AP %pM bandwidth change, disconnect\n",
3587 bssid);
3588 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3589 WLAN_REASON_DEAUTH_LEAVING,
3590 true, deauth_buf);
3591 ieee80211_report_disconnect(sdata, deauth_buf,
3592 sizeof(deauth_buf), true,
3593 WLAN_REASON_DEAUTH_LEAVING);
3594 return;
3595 }
3596
3597 if (sta && elems.opmode_notif)
3598 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3599 rx_status->band);
3600 mutex_unlock(&local->sta_mtx);
3601
3602 changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
3603 elems.country_elem,
3604 elems.country_elem_len,
3605 elems.pwr_constr_elem,
3606 elems.cisco_dtpc_elem);
3607
3608 ieee80211_bss_info_change_notify(sdata, changed);
3609 }
3610
3611 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3612 struct sk_buff *skb)
3613 {
3614 struct ieee80211_rx_status *rx_status;
3615 struct ieee80211_mgmt *mgmt;
3616 u16 fc;
3617 struct ieee802_11_elems elems;
3618 int ies_len;
3619
3620 rx_status = (struct ieee80211_rx_status *) skb->cb;
3621 mgmt = (struct ieee80211_mgmt *) skb->data;
3622 fc = le16_to_cpu(mgmt->frame_control);
3623
3624 sdata_lock(sdata);
3625
3626 switch (fc & IEEE80211_FCTL_STYPE) {
3627 case IEEE80211_STYPE_BEACON:
3628 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3629 break;
3630 case IEEE80211_STYPE_PROBE_RESP:
3631 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3632 break;
3633 case IEEE80211_STYPE_AUTH:
3634 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3635 break;
3636 case IEEE80211_STYPE_DEAUTH:
3637 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3638 break;
3639 case IEEE80211_STYPE_DISASSOC:
3640 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3641 break;
3642 case IEEE80211_STYPE_ASSOC_RESP:
3643 case IEEE80211_STYPE_REASSOC_RESP:
3644 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3645 break;
3646 case IEEE80211_STYPE_ACTION:
3647 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3648 ies_len = skb->len -
3649 offsetof(struct ieee80211_mgmt,
3650 u.action.u.chan_switch.variable);
3651
3652 if (ies_len < 0)
3653 break;
3654
3655 ieee802_11_parse_elems(
3656 mgmt->u.action.u.chan_switch.variable,
3657 ies_len, true, &elems);
3658
3659 if (elems.parse_error)
3660 break;
3661
3662 ieee80211_sta_process_chanswitch(sdata,
3663 rx_status->mactime,
3664 rx_status->device_timestamp,
3665 &elems, false);
3666 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3667 ies_len = skb->len -
3668 offsetof(struct ieee80211_mgmt,
3669 u.action.u.ext_chan_switch.variable);
3670
3671 if (ies_len < 0)
3672 break;
3673
3674 ieee802_11_parse_elems(
3675 mgmt->u.action.u.ext_chan_switch.variable,
3676 ies_len, true, &elems);
3677
3678 if (elems.parse_error)
3679 break;
3680
3681 /* for the handling code pretend this was also an IE */
3682 elems.ext_chansw_ie =
3683 &mgmt->u.action.u.ext_chan_switch.data;
3684
3685 ieee80211_sta_process_chanswitch(sdata,
3686 rx_status->mactime,
3687 rx_status->device_timestamp,
3688 &elems, false);
3689 }
3690 break;
3691 }
3692 sdata_unlock(sdata);
3693 }
3694
3695 static void ieee80211_sta_timer(unsigned long data)
3696 {
3697 struct ieee80211_sub_if_data *sdata =
3698 (struct ieee80211_sub_if_data *) data;
3699
3700 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3701 }
3702
3703 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3704 u8 *bssid, u8 reason, bool tx)
3705 {
3706 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3707
3708 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3709 tx, frame_buf);
3710
3711 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
3712 reason);
3713 }
3714
3715 static int ieee80211_auth(struct ieee80211_sub_if_data *sdata)
3716 {
3717 struct ieee80211_local *local = sdata->local;
3718 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3719 struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3720 u32 tx_flags = 0;
3721 u16 trans = 1;
3722 u16 status = 0;
3723
3724 sdata_assert_lock(sdata);
3725
3726 if (WARN_ON_ONCE(!auth_data))
3727 return -EINVAL;
3728
3729 auth_data->tries++;
3730
3731 if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3732 sdata_info(sdata, "authentication with %pM timed out\n",
3733 auth_data->bss->bssid);
3734
3735 /*
3736 * Most likely AP is not in the range so remove the
3737 * bss struct for that AP.
3738 */
3739 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3740
3741 return -ETIMEDOUT;
3742 }
3743
3744 drv_mgd_prepare_tx(local, sdata);
3745
3746 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3747 auth_data->bss->bssid, auth_data->tries,
3748 IEEE80211_AUTH_MAX_TRIES);
3749
3750 auth_data->expected_transaction = 2;
3751
3752 if (auth_data->algorithm == WLAN_AUTH_SAE) {
3753 trans = auth_data->sae_trans;
3754 status = auth_data->sae_status;
3755 auth_data->expected_transaction = trans;
3756 }
3757
3758 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3759 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3760 IEEE80211_TX_INTFL_MLME_CONN_TX;
3761
3762 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3763 auth_data->data, auth_data->data_len,
3764 auth_data->bss->bssid,
3765 auth_data->bss->bssid, NULL, 0, 0,
3766 tx_flags);
3767
3768 if (tx_flags == 0) {
3769 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3770 auth_data->timeout_started = true;
3771 run_again(sdata, auth_data->timeout);
3772 } else {
3773 auth_data->timeout =
3774 round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3775 auth_data->timeout_started = true;
3776 run_again(sdata, auth_data->timeout);
3777 }
3778
3779 return 0;
3780 }
3781
3782 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3783 {
3784 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3785 struct ieee80211_local *local = sdata->local;
3786
3787 sdata_assert_lock(sdata);
3788
3789 assoc_data->tries++;
3790 if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3791 sdata_info(sdata, "association with %pM timed out\n",
3792 assoc_data->bss->bssid);
3793
3794 /*
3795 * Most likely AP is not in the range so remove the
3796 * bss struct for that AP.
3797 */
3798 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3799
3800 return -ETIMEDOUT;
3801 }
3802
3803 sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3804 assoc_data->bss->bssid, assoc_data->tries,
3805 IEEE80211_ASSOC_MAX_TRIES);
3806 ieee80211_send_assoc(sdata);
3807
3808 if (!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3809 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3810 assoc_data->timeout_started = true;
3811 run_again(sdata, assoc_data->timeout);
3812 } else {
3813 assoc_data->timeout =
3814 round_jiffies_up(jiffies +
3815 IEEE80211_ASSOC_TIMEOUT_LONG);
3816 assoc_data->timeout_started = true;
3817 run_again(sdata, assoc_data->timeout);
3818 }
3819
3820 return 0;
3821 }
3822
3823 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3824 __le16 fc, bool acked)
3825 {
3826 struct ieee80211_local *local = sdata->local;
3827
3828 sdata->u.mgd.status_fc = fc;
3829 sdata->u.mgd.status_acked = acked;
3830 sdata->u.mgd.status_received = true;
3831
3832 ieee80211_queue_work(&local->hw, &sdata->work);
3833 }
3834
3835 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3836 {
3837 struct ieee80211_local *local = sdata->local;
3838 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3839
3840 sdata_lock(sdata);
3841
3842 if (ifmgd->status_received) {
3843 __le16 fc = ifmgd->status_fc;
3844 bool status_acked = ifmgd->status_acked;
3845
3846 ifmgd->status_received = false;
3847 if (ifmgd->auth_data && ieee80211_is_auth(fc)) {
3848 if (status_acked) {
3849 ifmgd->auth_data->timeout =
3850 jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3851 run_again(sdata, ifmgd->auth_data->timeout);
3852 } else {
3853 ifmgd->auth_data->timeout = jiffies - 1;
3854 }
3855 ifmgd->auth_data->timeout_started = true;
3856 } else if (ifmgd->assoc_data &&
3857 (ieee80211_is_assoc_req(fc) ||
3858 ieee80211_is_reassoc_req(fc))) {
3859 if (status_acked) {
3860 ifmgd->assoc_data->timeout =
3861 jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3862 run_again(sdata, ifmgd->assoc_data->timeout);
3863 } else {
3864 ifmgd->assoc_data->timeout = jiffies - 1;
3865 }
3866 ifmgd->assoc_data->timeout_started = true;
3867 }
3868 }
3869
3870 if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3871 time_after(jiffies, ifmgd->auth_data->timeout)) {
3872 if (ifmgd->auth_data->done) {
3873 /*
3874 * ok ... we waited for assoc but userspace didn't,
3875 * so let's just kill the auth data
3876 */
3877 ieee80211_destroy_auth_data(sdata, false);
3878 } else if (ieee80211_auth(sdata)) {
3879 u8 bssid[ETH_ALEN];
3880 struct ieee80211_event event = {
3881 .type = MLME_EVENT,
3882 .u.mlme.data = AUTH_EVENT,
3883 .u.mlme.status = MLME_TIMEOUT,
3884 };
3885
3886 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3887
3888 ieee80211_destroy_auth_data(sdata, false);
3889
3890 cfg80211_auth_timeout(sdata->dev, bssid);
3891 drv_event_callback(sdata->local, sdata, &event);
3892 }
3893 } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3894 run_again(sdata, ifmgd->auth_data->timeout);
3895
3896 if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3897 time_after(jiffies, ifmgd->assoc_data->timeout)) {
3898 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3899 ieee80211_do_assoc(sdata)) {
3900 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3901 struct ieee80211_event event = {
3902 .type = MLME_EVENT,
3903 .u.mlme.data = ASSOC_EVENT,
3904 .u.mlme.status = MLME_TIMEOUT,
3905 };
3906
3907 ieee80211_destroy_assoc_data(sdata, false, false);
3908 cfg80211_assoc_timeout(sdata->dev, bss);
3909 drv_event_callback(sdata->local, sdata, &event);
3910 }
3911 } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3912 run_again(sdata, ifmgd->assoc_data->timeout);
3913
3914 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3915 ifmgd->associated) {
3916 u8 bssid[ETH_ALEN];
3917 int max_tries;
3918
3919 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3920
3921 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3922 max_tries = max_nullfunc_tries;
3923 else
3924 max_tries = max_probe_tries;
3925
3926 /* ACK received for nullfunc probing frame */
3927 if (!ifmgd->probe_send_count)
3928 ieee80211_reset_ap_probe(sdata);
3929 else if (ifmgd->nullfunc_failed) {
3930 if (ifmgd->probe_send_count < max_tries) {
3931 mlme_dbg(sdata,
3932 "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3933 bssid, ifmgd->probe_send_count,
3934 max_tries);
3935 ieee80211_mgd_probe_ap_send(sdata);
3936 } else {
3937 mlme_dbg(sdata,
3938 "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3939 bssid);
3940 ieee80211_sta_connection_lost(sdata, bssid,
3941 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3942 false);
3943 }
3944 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3945 run_again(sdata, ifmgd->probe_timeout);
3946 else if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3947 mlme_dbg(sdata,
3948 "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3949 bssid, probe_wait_ms);
3950 ieee80211_sta_connection_lost(sdata, bssid,
3951 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3952 } else if (ifmgd->probe_send_count < max_tries) {
3953 mlme_dbg(sdata,
3954 "No probe response from AP %pM after %dms, try %d/%i\n",
3955 bssid, probe_wait_ms,
3956 ifmgd->probe_send_count, max_tries);
3957 ieee80211_mgd_probe_ap_send(sdata);
3958 } else {
3959 /*
3960 * We actually lost the connection ... or did we?
3961 * Let's make sure!
3962 */
3963 mlme_dbg(sdata,
3964 "No probe response from AP %pM after %dms, disconnecting.\n",
3965 bssid, probe_wait_ms);
3966
3967 ieee80211_sta_connection_lost(sdata, bssid,
3968 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3969 }
3970 }
3971
3972 sdata_unlock(sdata);
3973 }
3974
3975 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3976 {
3977 struct ieee80211_sub_if_data *sdata =
3978 (struct ieee80211_sub_if_data *) data;
3979 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3980
3981 if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3982 return;
3983
3984 sdata->u.mgd.connection_loss = false;
3985 ieee80211_queue_work(&sdata->local->hw,
3986 &sdata->u.mgd.beacon_connection_loss_work);
3987 }
3988
3989 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3990 {
3991 struct ieee80211_sub_if_data *sdata =
3992 (struct ieee80211_sub_if_data *) data;
3993 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3994 struct ieee80211_local *local = sdata->local;
3995
3996 if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3997 return;
3998
3999 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
4000 }
4001
4002 static void ieee80211_sta_monitor_work(struct work_struct *work)
4003 {
4004 struct ieee80211_sub_if_data *sdata =
4005 container_of(work, struct ieee80211_sub_if_data,
4006 u.mgd.monitor_work);
4007
4008 ieee80211_mgd_probe_ap(sdata, false);
4009 }
4010
4011 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
4012 {
4013 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
4014 __ieee80211_stop_poll(sdata);
4015
4016 /* let's probe the connection once */
4017 if (!ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
4018 ieee80211_queue_work(&sdata->local->hw,
4019 &sdata->u.mgd.monitor_work);
4020 }
4021 }
4022
4023 #ifdef CONFIG_PM
4024 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
4025 {
4026 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4027 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4028
4029 sdata_lock(sdata);
4030
4031 if (ifmgd->auth_data || ifmgd->assoc_data) {
4032 const u8 *bssid = ifmgd->auth_data ?
4033 ifmgd->auth_data->bss->bssid :
4034 ifmgd->assoc_data->bss->bssid;
4035
4036 /*
4037 * If we are trying to authenticate / associate while suspending,
4038 * cfg80211 won't know and won't actually abort those attempts,
4039 * thus we need to do that ourselves.
4040 */
4041 ieee80211_send_deauth_disassoc(sdata, bssid,
4042 IEEE80211_STYPE_DEAUTH,
4043 WLAN_REASON_DEAUTH_LEAVING,
4044 false, frame_buf);
4045 if (ifmgd->assoc_data)
4046 ieee80211_destroy_assoc_data(sdata, false, true);
4047 if (ifmgd->auth_data)
4048 ieee80211_destroy_auth_data(sdata, false);
4049 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4050 IEEE80211_DEAUTH_FRAME_LEN);
4051 }
4052
4053 /* This is a bit of a hack - we should find a better and more generic
4054 * solution to this. Normally when suspending, cfg80211 will in fact
4055 * deauthenticate. However, it doesn't (and cannot) stop an ongoing
4056 * auth (not so important) or assoc (this is the problem) process.
4057 *
4058 * As a consequence, it can happen that we are in the process of both
4059 * associating and suspending, and receive an association response
4060 * after cfg80211 has checked if it needs to disconnect, but before
4061 * we actually set the flag to drop incoming frames. This will then
4062 * cause the workqueue flush to process the association response in
4063 * the suspend, resulting in a successful association just before it
4064 * tries to remove the interface from the driver, which now though
4065 * has a channel context assigned ... this results in issues.
4066 *
4067 * To work around this (for now) simply deauth here again if we're
4068 * now connected.
4069 */
4070 if (ifmgd->associated && !sdata->local->wowlan) {
4071 u8 bssid[ETH_ALEN];
4072 struct cfg80211_deauth_request req = {
4073 .reason_code = WLAN_REASON_DEAUTH_LEAVING,
4074 .bssid = bssid,
4075 };
4076
4077 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
4078 ieee80211_mgd_deauth(sdata, &req);
4079 }
4080
4081 sdata_unlock(sdata);
4082 }
4083
4084 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
4085 {
4086 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4087
4088 sdata_lock(sdata);
4089 if (!ifmgd->associated) {
4090 sdata_unlock(sdata);
4091 return;
4092 }
4093
4094 if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
4095 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
4096 mlme_dbg(sdata, "driver requested disconnect after resume\n");
4097 ieee80211_sta_connection_lost(sdata,
4098 ifmgd->associated->bssid,
4099 WLAN_REASON_UNSPECIFIED,
4100 true);
4101 sdata_unlock(sdata);
4102 return;
4103 }
4104 sdata_unlock(sdata);
4105 }
4106 #endif
4107
4108 /* interface setup */
4109 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
4110 {
4111 struct ieee80211_if_managed *ifmgd;
4112
4113 ifmgd = &sdata->u.mgd;
4114 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
4115 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
4116 INIT_WORK(&ifmgd->beacon_connection_loss_work,
4117 ieee80211_beacon_connection_loss_work);
4118 INIT_WORK(&ifmgd->csa_connection_drop_work,
4119 ieee80211_csa_connection_drop_work);
4120 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
4121 INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
4122 ieee80211_tdls_peer_del_work);
4123 setup_timer(&ifmgd->timer, ieee80211_sta_timer,
4124 (unsigned long) sdata);
4125 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
4126 (unsigned long) sdata);
4127 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
4128 (unsigned long) sdata);
4129 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
4130 (unsigned long) sdata);
4131 INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
4132 ieee80211_sta_handle_tspec_ac_params_wk);
4133
4134 ifmgd->flags = 0;
4135 ifmgd->powersave = sdata->wdev.ps;
4136 ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
4137 ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
4138 ifmgd->p2p_noa_index = -1;
4139
4140 if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4141 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
4142 else
4143 ifmgd->req_smps = IEEE80211_SMPS_OFF;
4144
4145 /* Setup TDLS data */
4146 spin_lock_init(&ifmgd->teardown_lock);
4147 ifmgd->teardown_skb = NULL;
4148 ifmgd->orig_teardown_skb = NULL;
4149 }
4150
4151 /* scan finished notification */
4152 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
4153 {
4154 struct ieee80211_sub_if_data *sdata;
4155
4156 /* Restart STA timers */
4157 rcu_read_lock();
4158 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4159 if (ieee80211_sdata_running(sdata))
4160 ieee80211_restart_sta_timer(sdata);
4161 }
4162 rcu_read_unlock();
4163 }
4164
4165 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
4166 struct cfg80211_bss *cbss)
4167 {
4168 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4169 const u8 *ht_cap_ie, *vht_cap_ie;
4170 const struct ieee80211_ht_cap *ht_cap;
4171 const struct ieee80211_vht_cap *vht_cap;
4172 u8 chains = 1;
4173
4174 if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
4175 return chains;
4176
4177 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4178 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
4179 ht_cap = (void *)(ht_cap_ie + 2);
4180 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
4181 /*
4182 * TODO: use "Tx Maximum Number Spatial Streams Supported" and
4183 * "Tx Unequal Modulation Supported" fields.
4184 */
4185 }
4186
4187 if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
4188 return chains;
4189
4190 vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4191 if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
4192 u8 nss;
4193 u16 tx_mcs_map;
4194
4195 vht_cap = (void *)(vht_cap_ie + 2);
4196 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
4197 for (nss = 8; nss > 0; nss--) {
4198 if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
4199 IEEE80211_VHT_MCS_NOT_SUPPORTED)
4200 break;
4201 }
4202 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
4203 chains = max(chains, nss);
4204 }
4205
4206 return chains;
4207 }
4208
4209 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
4210 struct cfg80211_bss *cbss)
4211 {
4212 struct ieee80211_local *local = sdata->local;
4213 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4214 const struct ieee80211_ht_cap *ht_cap = NULL;
4215 const struct ieee80211_ht_operation *ht_oper = NULL;
4216 const struct ieee80211_vht_operation *vht_oper = NULL;
4217 struct ieee80211_supported_band *sband;
4218 struct cfg80211_chan_def chandef;
4219 int ret;
4220 u32 i;
4221 bool have_80mhz;
4222
4223 sband = local->hw.wiphy->bands[cbss->channel->band];
4224
4225 ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
4226 IEEE80211_STA_DISABLE_80P80MHZ |
4227 IEEE80211_STA_DISABLE_160MHZ);
4228
4229 rcu_read_lock();
4230
4231 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
4232 sband->ht_cap.ht_supported) {
4233 const u8 *ht_oper_ie, *ht_cap_ie;
4234
4235 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4236 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
4237 ht_oper = (void *)(ht_oper_ie + 2);
4238
4239 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4240 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
4241 ht_cap = (void *)(ht_cap_ie + 2);
4242
4243 if (!ht_cap) {
4244 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4245 ht_oper = NULL;
4246 }
4247 }
4248
4249 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4250 sband->vht_cap.vht_supported) {
4251 const u8 *vht_oper_ie, *vht_cap;
4252
4253 vht_oper_ie = ieee80211_bss_get_ie(cbss,
4254 WLAN_EID_VHT_OPERATION);
4255 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
4256 vht_oper = (void *)(vht_oper_ie + 2);
4257 if (vht_oper && !ht_oper) {
4258 vht_oper = NULL;
4259 sdata_info(sdata,
4260 "AP advertised VHT without HT, disabling both\n");
4261 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4262 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4263 }
4264
4265 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4266 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
4267 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4268 vht_oper = NULL;
4269 }
4270 }
4271
4272 /* Allow VHT if at least one channel on the sband supports 80 MHz */
4273 have_80mhz = false;
4274 for (i = 0; i < sband->n_channels; i++) {
4275 if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
4276 IEEE80211_CHAN_NO_80MHZ))
4277 continue;
4278
4279 have_80mhz = true;
4280 break;
4281 }
4282
4283 if (!have_80mhz)
4284 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4285
4286 ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
4287 cbss->channel,
4288 ht_cap, ht_oper, vht_oper,
4289 &chandef, false);
4290
4291 sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
4292 local->rx_chains);
4293
4294 rcu_read_unlock();
4295
4296 /* will change later if needed */
4297 sdata->smps_mode = IEEE80211_SMPS_OFF;
4298
4299 mutex_lock(&local->mtx);
4300 /*
4301 * If this fails (possibly due to channel context sharing
4302 * on incompatible channels, e.g. 80+80 and 160 sharing the
4303 * same control channel) try to use a smaller bandwidth.
4304 */
4305 ret = ieee80211_vif_use_channel(sdata, &chandef,
4306 IEEE80211_CHANCTX_SHARED);
4307
4308 /* don't downgrade for 5 and 10 MHz channels, though. */
4309 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
4310 chandef.width == NL80211_CHAN_WIDTH_10)
4311 goto out;
4312
4313 while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4314 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4315 ret = ieee80211_vif_use_channel(sdata, &chandef,
4316 IEEE80211_CHANCTX_SHARED);
4317 }
4318 out:
4319 mutex_unlock(&local->mtx);
4320 return ret;
4321 }
4322
4323 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4324 struct cfg80211_bss *cbss, bool assoc,
4325 bool override)
4326 {
4327 struct ieee80211_local *local = sdata->local;
4328 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4329 struct ieee80211_bss *bss = (void *)cbss->priv;
4330 struct sta_info *new_sta = NULL;
4331 struct ieee80211_supported_band *sband;
4332 bool have_sta = false;
4333 int err;
4334
4335 sband = local->hw.wiphy->bands[cbss->channel->band];
4336
4337 if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
4338 return -EINVAL;
4339
4340 if (assoc) {
4341 rcu_read_lock();
4342 have_sta = sta_info_get(sdata, cbss->bssid);
4343 rcu_read_unlock();
4344 }
4345
4346 if (!have_sta) {
4347 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
4348 if (!new_sta)
4349 return -ENOMEM;
4350 }
4351
4352 if (new_sta || override) {
4353 err = ieee80211_prep_channel(sdata, cbss);
4354 if (err) {
4355 if (new_sta)
4356 sta_info_free(local, new_sta);
4357 return -EINVAL;
4358 }
4359 }
4360
4361 if (new_sta) {
4362 u32 rates = 0, basic_rates = 0;
4363 bool have_higher_than_11mbit;
4364 int min_rate = INT_MAX, min_rate_index = -1;
4365 struct ieee80211_chanctx_conf *chanctx_conf;
4366 const struct cfg80211_bss_ies *ies;
4367 int shift = ieee80211_vif_get_shift(&sdata->vif);
4368 u32 rate_flags;
4369
4370 rcu_read_lock();
4371 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4372 if (WARN_ON(!chanctx_conf)) {
4373 rcu_read_unlock();
4374 sta_info_free(local, new_sta);
4375 return -EINVAL;
4376 }
4377 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
4378 rcu_read_unlock();
4379
4380 ieee80211_get_rates(sband, bss->supp_rates,
4381 bss->supp_rates_len,
4382 &rates, &basic_rates,
4383 &have_higher_than_11mbit,
4384 &min_rate, &min_rate_index,
4385 shift, rate_flags);
4386
4387 /*
4388 * This used to be a workaround for basic rates missing
4389 * in the association response frame. Now that we no
4390 * longer use the basic rates from there, it probably
4391 * doesn't happen any more, but keep the workaround so
4392 * in case some *other* APs are buggy in different ways
4393 * we can connect -- with a warning.
4394 */
4395 if (!basic_rates && min_rate_index >= 0) {
4396 sdata_info(sdata,
4397 "No basic rates, using min rate instead\n");
4398 basic_rates = BIT(min_rate_index);
4399 }
4400
4401 new_sta->sta.supp_rates[cbss->channel->band] = rates;
4402 sdata->vif.bss_conf.basic_rates = basic_rates;
4403
4404 /* cf. IEEE 802.11 9.2.12 */
4405 if (cbss->channel->band == NL80211_BAND_2GHZ &&
4406 have_higher_than_11mbit)
4407 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
4408 else
4409 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
4410
4411 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
4412
4413 /* set timing information */
4414 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
4415 rcu_read_lock();
4416 ies = rcu_dereference(cbss->beacon_ies);
4417 if (ies) {
4418 const u8 *tim_ie;
4419
4420 sdata->vif.bss_conf.sync_tsf = ies->tsf;
4421 sdata->vif.bss_conf.sync_device_ts =
4422 bss->device_ts_beacon;
4423 tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4424 ies->data, ies->len);
4425 if (tim_ie && tim_ie[1] >= 2)
4426 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
4427 else
4428 sdata->vif.bss_conf.sync_dtim_count = 0;
4429 } else if (!ieee80211_hw_check(&sdata->local->hw,
4430 TIMING_BEACON_ONLY)) {
4431 ies = rcu_dereference(cbss->proberesp_ies);
4432 /* must be non-NULL since beacon IEs were NULL */
4433 sdata->vif.bss_conf.sync_tsf = ies->tsf;
4434 sdata->vif.bss_conf.sync_device_ts =
4435 bss->device_ts_presp;
4436 sdata->vif.bss_conf.sync_dtim_count = 0;
4437 } else {
4438 sdata->vif.bss_conf.sync_tsf = 0;
4439 sdata->vif.bss_conf.sync_device_ts = 0;
4440 sdata->vif.bss_conf.sync_dtim_count = 0;
4441 }
4442 rcu_read_unlock();
4443
4444 /* tell driver about BSSID, basic rates and timing */
4445 ieee80211_bss_info_change_notify(sdata,
4446 BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4447 BSS_CHANGED_BEACON_INT);
4448
4449 if (assoc)
4450 sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4451
4452 err = sta_info_insert(new_sta);
4453 new_sta = NULL;
4454 if (err) {
4455 sdata_info(sdata,
4456 "failed to insert STA entry for the AP (error %d)\n",
4457 err);
4458 return err;
4459 }
4460 } else
4461 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4462
4463 /* Cancel scan to ensure that nothing interferes with connection */
4464 if (local->scanning)
4465 ieee80211_scan_cancel(local);
4466
4467 return 0;
4468 }
4469
4470 /* config hooks */
4471 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4472 struct cfg80211_auth_request *req)
4473 {
4474 struct ieee80211_local *local = sdata->local;
4475 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4476 struct ieee80211_mgd_auth_data *auth_data;
4477 u16 auth_alg;
4478 int err;
4479
4480 /* prepare auth data structure */
4481
4482 switch (req->auth_type) {
4483 case NL80211_AUTHTYPE_OPEN_SYSTEM:
4484 auth_alg = WLAN_AUTH_OPEN;
4485 break;
4486 case NL80211_AUTHTYPE_SHARED_KEY:
4487 if (IS_ERR(local->wep_tx_tfm))
4488 return -EOPNOTSUPP;
4489 auth_alg = WLAN_AUTH_SHARED_KEY;
4490 break;
4491 case NL80211_AUTHTYPE_FT:
4492 auth_alg = WLAN_AUTH_FT;
4493 break;
4494 case NL80211_AUTHTYPE_NETWORK_EAP:
4495 auth_alg = WLAN_AUTH_LEAP;
4496 break;
4497 case NL80211_AUTHTYPE_SAE:
4498 auth_alg = WLAN_AUTH_SAE;
4499 break;
4500 case NL80211_AUTHTYPE_FILS_SK:
4501 auth_alg = WLAN_AUTH_FILS_SK;
4502 break;
4503 case NL80211_AUTHTYPE_FILS_SK_PFS:
4504 auth_alg = WLAN_AUTH_FILS_SK_PFS;
4505 break;
4506 case NL80211_AUTHTYPE_FILS_PK:
4507 auth_alg = WLAN_AUTH_FILS_PK;
4508 break;
4509 default:
4510 return -EOPNOTSUPP;
4511 }
4512
4513 auth_data = kzalloc(sizeof(*auth_data) + req->auth_data_len +
4514 req->ie_len, GFP_KERNEL);
4515 if (!auth_data)
4516 return -ENOMEM;
4517
4518 auth_data->bss = req->bss;
4519
4520 if (req->auth_data_len >= 4) {
4521 if (req->auth_type == NL80211_AUTHTYPE_SAE) {
4522 __le16 *pos = (__le16 *) req->auth_data;
4523
4524 auth_data->sae_trans = le16_to_cpu(pos[0]);
4525 auth_data->sae_status = le16_to_cpu(pos[1]);
4526 }
4527 memcpy(auth_data->data, req->auth_data + 4,
4528 req->auth_data_len - 4);
4529 auth_data->data_len += req->auth_data_len - 4;
4530 }
4531
4532 if (req->ie && req->ie_len) {
4533 memcpy(&auth_data->data[auth_data->data_len],
4534 req->ie, req->ie_len);
4535 auth_data->data_len += req->ie_len;
4536 }
4537
4538 if (req->key && req->key_len) {
4539 auth_data->key_len = req->key_len;
4540 auth_data->key_idx = req->key_idx;
4541 memcpy(auth_data->key, req->key, req->key_len);
4542 }
4543
4544 auth_data->algorithm = auth_alg;
4545
4546 /* try to authenticate/probe */
4547
4548 if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4549 ifmgd->assoc_data) {
4550 err = -EBUSY;
4551 goto err_free;
4552 }
4553
4554 if (ifmgd->auth_data)
4555 ieee80211_destroy_auth_data(sdata, false);
4556
4557 /* prep auth_data so we don't go into idle on disassoc */
4558 ifmgd->auth_data = auth_data;
4559
4560 if (ifmgd->associated) {
4561 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4562
4563 sdata_info(sdata,
4564 "disconnect from AP %pM for new auth to %pM\n",
4565 ifmgd->associated->bssid, req->bss->bssid);
4566 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4567 WLAN_REASON_UNSPECIFIED,
4568 false, frame_buf);
4569
4570 ieee80211_report_disconnect(sdata, frame_buf,
4571 sizeof(frame_buf), true,
4572 WLAN_REASON_UNSPECIFIED);
4573 }
4574
4575 sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4576
4577 err = ieee80211_prep_connection(sdata, req->bss, false, false);
4578 if (err)
4579 goto err_clear;
4580
4581 err = ieee80211_auth(sdata);
4582 if (err) {
4583 sta_info_destroy_addr(sdata, req->bss->bssid);
4584 goto err_clear;
4585 }
4586
4587 /* hold our own reference */
4588 cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4589 return 0;
4590
4591 err_clear:
4592 eth_zero_addr(ifmgd->bssid);
4593 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4594 ifmgd->auth_data = NULL;
4595 mutex_lock(&sdata->local->mtx);
4596 ieee80211_vif_release_channel(sdata);
4597 mutex_unlock(&sdata->local->mtx);
4598 err_free:
4599 kfree(auth_data);
4600 return err;
4601 }
4602
4603 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4604 struct cfg80211_assoc_request *req)
4605 {
4606 struct ieee80211_local *local = sdata->local;
4607 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4608 struct ieee80211_bss *bss = (void *)req->bss->priv;
4609 struct ieee80211_mgd_assoc_data *assoc_data;
4610 const struct cfg80211_bss_ies *beacon_ies;
4611 struct ieee80211_supported_band *sband;
4612 const u8 *ssidie, *ht_ie, *vht_ie;
4613 int i, err;
4614 bool override = false;
4615
4616 assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4617 if (!assoc_data)
4618 return -ENOMEM;
4619
4620 rcu_read_lock();
4621 ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4622 if (!ssidie) {
4623 rcu_read_unlock();
4624 kfree(assoc_data);
4625 return -EINVAL;
4626 }
4627 memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4628 assoc_data->ssid_len = ssidie[1];
4629 rcu_read_unlock();
4630
4631 if (ifmgd->associated) {
4632 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4633
4634 sdata_info(sdata,
4635 "disconnect from AP %pM for new assoc to %pM\n",
4636 ifmgd->associated->bssid, req->bss->bssid);
4637 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4638 WLAN_REASON_UNSPECIFIED,
4639 false, frame_buf);
4640
4641 ieee80211_report_disconnect(sdata, frame_buf,
4642 sizeof(frame_buf), true,
4643 WLAN_REASON_UNSPECIFIED);
4644 }
4645
4646 if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4647 err = -EBUSY;
4648 goto err_free;
4649 }
4650
4651 if (ifmgd->assoc_data) {
4652 err = -EBUSY;
4653 goto err_free;
4654 }
4655
4656 if (ifmgd->auth_data) {
4657 bool match;
4658
4659 /* keep sta info, bssid if matching */
4660 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4661 ieee80211_destroy_auth_data(sdata, match);
4662 }
4663
4664 /* prepare assoc data */
4665
4666 ifmgd->beacon_crc_valid = false;
4667
4668 assoc_data->wmm = bss->wmm_used &&
4669 (local->hw.queues >= IEEE80211_NUM_ACS);
4670
4671 /*
4672 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4673 * We still associate in non-HT mode (11a/b/g) if any one of these
4674 * ciphers is configured as pairwise.
4675 * We can set this to true for non-11n hardware, that'll be checked
4676 * separately along with the peer capabilities.
4677 */
4678 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4679 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4680 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4681 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4682 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4683 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4684 netdev_info(sdata->dev,
4685 "disabling HT/VHT due to WEP/TKIP use\n");
4686 }
4687 }
4688
4689 /* Also disable HT if we don't support it or the AP doesn't use WMM */
4690 sband = local->hw.wiphy->bands[req->bss->channel->band];
4691 if (!sband->ht_cap.ht_supported ||
4692 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4693 ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4694 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4695 if (!bss->wmm_used &&
4696 !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4697 netdev_info(sdata->dev,
4698 "disabling HT as WMM/QoS is not supported by the AP\n");
4699 }
4700
4701 /* disable VHT if we don't support it or the AP doesn't use WMM */
4702 if (!sband->vht_cap.vht_supported ||
4703 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4704 ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4705 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4706 if (!bss->wmm_used &&
4707 !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4708 netdev_info(sdata->dev,
4709 "disabling VHT as WMM/QoS is not supported by the AP\n");
4710 }
4711
4712 memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4713 memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4714 sizeof(ifmgd->ht_capa_mask));
4715
4716 memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4717 memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4718 sizeof(ifmgd->vht_capa_mask));
4719
4720 if (req->ie && req->ie_len) {
4721 memcpy(assoc_data->ie, req->ie, req->ie_len);
4722 assoc_data->ie_len = req->ie_len;
4723 }
4724
4725 if (req->fils_kek) {
4726 /* should already be checked in cfg80211 - so warn */
4727 if (WARN_ON(req->fils_kek_len > FILS_MAX_KEK_LEN)) {
4728 err = -EINVAL;
4729 goto err_free;
4730 }
4731 memcpy(assoc_data->fils_kek, req->fils_kek,
4732 req->fils_kek_len);
4733 assoc_data->fils_kek_len = req->fils_kek_len;
4734 }
4735
4736 if (req->fils_nonces)
4737 memcpy(assoc_data->fils_nonces, req->fils_nonces,
4738 2 * FILS_NONCE_LEN);
4739
4740 assoc_data->bss = req->bss;
4741
4742 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4743 if (ifmgd->powersave)
4744 sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4745 else
4746 sdata->smps_mode = IEEE80211_SMPS_OFF;
4747 } else
4748 sdata->smps_mode = ifmgd->req_smps;
4749
4750 assoc_data->capability = req->bss->capability;
4751 assoc_data->supp_rates = bss->supp_rates;
4752 assoc_data->supp_rates_len = bss->supp_rates_len;
4753
4754 rcu_read_lock();
4755 ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4756 if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4757 assoc_data->ap_ht_param =
4758 ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4759 else
4760 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4761 vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4762 if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4763 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4764 sizeof(struct ieee80211_vht_cap));
4765 else
4766 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4767 rcu_read_unlock();
4768
4769 if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) &&
4770 ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK),
4771 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"))
4772 sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;
4773
4774 if (bss->wmm_used && bss->uapsd_supported &&
4775 (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) {
4776 assoc_data->uapsd = true;
4777 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4778 } else {
4779 assoc_data->uapsd = false;
4780 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4781 }
4782
4783 if (req->prev_bssid)
4784 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4785
4786 if (req->use_mfp) {
4787 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4788 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4789 } else {
4790 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4791 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4792 }
4793
4794 if (req->flags & ASSOC_REQ_USE_RRM)
4795 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
4796 else
4797 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;
4798
4799 if (req->crypto.control_port)
4800 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4801 else
4802 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4803
4804 sdata->control_port_protocol = req->crypto.control_port_ethertype;
4805 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4806 sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4807 sdata->vif.type);
4808
4809 /* kick off associate process */
4810
4811 ifmgd->assoc_data = assoc_data;
4812 ifmgd->dtim_period = 0;
4813 ifmgd->have_beacon = false;
4814
4815 /* override HT/VHT configuration only if the AP and we support it */
4816 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
4817 struct ieee80211_sta_ht_cap sta_ht_cap;
4818
4819 if (req->flags & ASSOC_REQ_DISABLE_HT)
4820 override = true;
4821
4822 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
4823 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
4824
4825 /* check for 40 MHz disable override */
4826 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ) &&
4827 sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
4828 !(sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
4829 override = true;
4830
4831 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4832 req->flags & ASSOC_REQ_DISABLE_VHT)
4833 override = true;
4834 }
4835
4836 if (req->flags & ASSOC_REQ_DISABLE_HT) {
4837 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4838 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4839 }
4840
4841 if (req->flags & ASSOC_REQ_DISABLE_VHT)
4842 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4843
4844 err = ieee80211_prep_connection(sdata, req->bss, true, override);
4845 if (err)
4846 goto err_clear;
4847
4848 rcu_read_lock();
4849 beacon_ies = rcu_dereference(req->bss->beacon_ies);
4850
4851 if (ieee80211_hw_check(&sdata->local->hw, NEED_DTIM_BEFORE_ASSOC) &&
4852 !beacon_ies) {
4853 /*
4854 * Wait up to one beacon interval ...
4855 * should this be more if we miss one?
4856 */
4857 sdata_info(sdata, "waiting for beacon from %pM\n",
4858 ifmgd->bssid);
4859 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4860 assoc_data->timeout_started = true;
4861 assoc_data->need_beacon = true;
4862 } else if (beacon_ies) {
4863 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4864 beacon_ies->data,
4865 beacon_ies->len);
4866 u8 dtim_count = 0;
4867
4868 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4869 const struct ieee80211_tim_ie *tim;
4870 tim = (void *)(tim_ie + 2);
4871 ifmgd->dtim_period = tim->dtim_period;
4872 dtim_count = tim->dtim_count;
4873 }
4874 ifmgd->have_beacon = true;
4875 assoc_data->timeout = jiffies;
4876 assoc_data->timeout_started = true;
4877
4878 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
4879 sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4880 sdata->vif.bss_conf.sync_device_ts =
4881 bss->device_ts_beacon;
4882 sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4883 }
4884 } else {
4885 assoc_data->timeout = jiffies;
4886 assoc_data->timeout_started = true;
4887 }
4888 rcu_read_unlock();
4889
4890 run_again(sdata, assoc_data->timeout);
4891
4892 if (bss->corrupt_data) {
4893 char *corrupt_type = "data";
4894 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4895 if (bss->corrupt_data &
4896 IEEE80211_BSS_CORRUPT_PROBE_RESP)
4897 corrupt_type = "beacon and probe response";
4898 else
4899 corrupt_type = "beacon";
4900 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4901 corrupt_type = "probe response";
4902 sdata_info(sdata, "associating with AP with corrupt %s\n",
4903 corrupt_type);
4904 }
4905
4906 return 0;
4907 err_clear:
4908 eth_zero_addr(ifmgd->bssid);
4909 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4910 ifmgd->assoc_data = NULL;
4911 err_free:
4912 kfree(assoc_data);
4913 return err;
4914 }
4915
4916 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4917 struct cfg80211_deauth_request *req)
4918 {
4919 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4920 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4921 bool tx = !req->local_state_change;
4922
4923 if (ifmgd->auth_data &&
4924 ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
4925 sdata_info(sdata,
4926 "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
4927 req->bssid, req->reason_code,
4928 ieee80211_get_reason_code_string(req->reason_code));
4929
4930 drv_mgd_prepare_tx(sdata->local, sdata);
4931 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4932 IEEE80211_STYPE_DEAUTH,
4933 req->reason_code, tx,
4934 frame_buf);
4935 ieee80211_destroy_auth_data(sdata, false);
4936 ieee80211_report_disconnect(sdata, frame_buf,
4937 sizeof(frame_buf), true,
4938 req->reason_code);
4939
4940 return 0;
4941 }
4942
4943 if (ifmgd->assoc_data &&
4944 ether_addr_equal(ifmgd->assoc_data->bss->bssid, req->bssid)) {
4945 sdata_info(sdata,
4946 "aborting association with %pM by local choice (Reason: %u=%s)\n",
4947 req->bssid, req->reason_code,
4948 ieee80211_get_reason_code_string(req->reason_code));
4949
4950 drv_mgd_prepare_tx(sdata->local, sdata);
4951 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4952 IEEE80211_STYPE_DEAUTH,
4953 req->reason_code, tx,
4954 frame_buf);
4955 ieee80211_destroy_assoc_data(sdata, false, true);
4956 ieee80211_report_disconnect(sdata, frame_buf,
4957 sizeof(frame_buf), true,
4958 req->reason_code);
4959 return 0;
4960 }
4961
4962 if (ifmgd->associated &&
4963 ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4964 sdata_info(sdata,
4965 "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
4966 req->bssid, req->reason_code,
4967 ieee80211_get_reason_code_string(req->reason_code));
4968
4969 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4970 req->reason_code, tx, frame_buf);
4971 ieee80211_report_disconnect(sdata, frame_buf,
4972 sizeof(frame_buf), true,
4973 req->reason_code);
4974 return 0;
4975 }
4976
4977 return -ENOTCONN;
4978 }
4979
4980 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4981 struct cfg80211_disassoc_request *req)
4982 {
4983 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4984 u8 bssid[ETH_ALEN];
4985 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4986
4987 /*
4988 * cfg80211 should catch this ... but it's racy since
4989 * we can receive a disassoc frame, process it, hand it
4990 * to cfg80211 while that's in a locked section already
4991 * trying to tell us that the user wants to disconnect.
4992 */
4993 if (ifmgd->associated != req->bss)
4994 return -ENOLINK;
4995
4996 sdata_info(sdata,
4997 "disassociating from %pM by local choice (Reason: %u=%s)\n",
4998 req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
4999
5000 memcpy(bssid, req->bss->bssid, ETH_ALEN);
5001 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
5002 req->reason_code, !req->local_state_change,
5003 frame_buf);
5004
5005 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
5006 req->reason_code);
5007
5008 return 0;
5009 }
5010
5011 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
5012 {
5013 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5014
5015 /*
5016 * Make sure some work items will not run after this,
5017 * they will not do anything but might not have been
5018 * cancelled when disconnecting.
5019 */
5020 cancel_work_sync(&ifmgd->monitor_work);
5021 cancel_work_sync(&ifmgd->beacon_connection_loss_work);
5022 cancel_work_sync(&ifmgd->request_smps_work);
5023 cancel_work_sync(&ifmgd->csa_connection_drop_work);
5024 cancel_work_sync(&ifmgd->chswitch_work);
5025 cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
5026
5027 sdata_lock(sdata);
5028 if (ifmgd->assoc_data) {
5029 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
5030 ieee80211_destroy_assoc_data(sdata, false, false);
5031 cfg80211_assoc_timeout(sdata->dev, bss);
5032 }
5033 if (ifmgd->auth_data)
5034 ieee80211_destroy_auth_data(sdata, false);
5035 spin_lock_bh(&ifmgd->teardown_lock);
5036 if (ifmgd->teardown_skb) {
5037 kfree_skb(ifmgd->teardown_skb);
5038 ifmgd->teardown_skb = NULL;
5039 ifmgd->orig_teardown_skb = NULL;
5040 }
5041 spin_unlock_bh(&ifmgd->teardown_lock);
5042 del_timer_sync(&ifmgd->timer);
5043 sdata_unlock(sdata);
5044 }
5045
5046 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
5047 enum nl80211_cqm_rssi_threshold_event rssi_event,
5048 gfp_t gfp)
5049 {
5050 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5051
5052 trace_api_cqm_rssi_notify(sdata, rssi_event);
5053
5054 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
5055 }
5056 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
5057
5058 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp)
5059 {
5060 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5061
5062 trace_api_cqm_beacon_loss_notify(sdata->local, sdata);
5063
5064 cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp);
5065 }
5066 EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify);
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