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Merge branches 'acpi-smbus', 'acpi-ec' and 'acpi-pci'
[deliverable/linux.git] / net / mac80211 / mlme.c
1 /*
2 * BSS client mode implementation
3 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4 * Copyright 2004, Instant802 Networks, Inc.
5 * Copyright 2005, Devicescape Software, Inc.
6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8 * Copyright 2013-2014 Intel Mobile Communications GmbH
9 * Copyright (C) 2015 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
34 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
35 #define IEEE80211_AUTH_TIMEOUT_LONG (HZ / 2)
36 #define IEEE80211_AUTH_TIMEOUT_SHORT (HZ / 10)
37 #define IEEE80211_AUTH_MAX_TRIES 3
38 #define IEEE80211_AUTH_WAIT_ASSOC (HZ * 5)
39 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
40 #define IEEE80211_ASSOC_TIMEOUT_LONG (HZ / 2)
41 #define IEEE80211_ASSOC_TIMEOUT_SHORT (HZ / 10)
42 #define IEEE80211_ASSOC_MAX_TRIES 3
43
44 static int max_nullfunc_tries = 2;
45 module_param(max_nullfunc_tries, int, 0644);
46 MODULE_PARM_DESC(max_nullfunc_tries,
47 "Maximum nullfunc tx tries before disconnecting (reason 4).");
48
49 static int max_probe_tries = 5;
50 module_param(max_probe_tries, int, 0644);
51 MODULE_PARM_DESC(max_probe_tries,
52 "Maximum probe tries before disconnecting (reason 4).");
53
54 /*
55 * Beacon loss timeout is calculated as N frames times the
56 * advertised beacon interval. This may need to be somewhat
57 * higher than what hardware might detect to account for
58 * delays in the host processing frames. But since we also
59 * probe on beacon miss before declaring the connection lost
60 * default to what we want.
61 */
62 static int beacon_loss_count = 7;
63 module_param(beacon_loss_count, int, 0644);
64 MODULE_PARM_DESC(beacon_loss_count,
65 "Number of beacon intervals before we decide beacon was lost.");
66
67 /*
68 * Time the connection can be idle before we probe
69 * it to see if we can still talk to the AP.
70 */
71 #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ)
72 /*
73 * Time we wait for a probe response after sending
74 * a probe request because of beacon loss or for
75 * checking the connection still works.
76 */
77 static int probe_wait_ms = 500;
78 module_param(probe_wait_ms, int, 0644);
79 MODULE_PARM_DESC(probe_wait_ms,
80 "Maximum time(ms) to wait for probe response"
81 " before disconnecting (reason 4).");
82
83 /*
84 * How many Beacon frames need to have been used in average signal strength
85 * before starting to indicate signal change events.
86 */
87 #define IEEE80211_SIGNAL_AVE_MIN_COUNT 4
88
89 /*
90 * We can have multiple work items (and connection probing)
91 * scheduling this timer, but we need to take care to only
92 * reschedule it when it should fire _earlier_ than it was
93 * asked for before, or if it's not pending right now. This
94 * function ensures that. Note that it then is required to
95 * run this function for all timeouts after the first one
96 * has happened -- the work that runs from this timer will
97 * do that.
98 */
99 static void run_again(struct ieee80211_sub_if_data *sdata,
100 unsigned long timeout)
101 {
102 sdata_assert_lock(sdata);
103
104 if (!timer_pending(&sdata->u.mgd.timer) ||
105 time_before(timeout, sdata->u.mgd.timer.expires))
106 mod_timer(&sdata->u.mgd.timer, timeout);
107 }
108
109 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
110 {
111 if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
112 return;
113
114 if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
115 return;
116
117 mod_timer(&sdata->u.mgd.bcn_mon_timer,
118 round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
119 }
120
121 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
122 {
123 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
124
125 if (unlikely(!sdata->u.mgd.associated))
126 return;
127
128 ifmgd->probe_send_count = 0;
129
130 if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
131 return;
132
133 mod_timer(&sdata->u.mgd.conn_mon_timer,
134 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
135 }
136
137 static int ecw2cw(int ecw)
138 {
139 return (1 << ecw) - 1;
140 }
141
142 static u32
143 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
144 struct ieee80211_supported_band *sband,
145 struct ieee80211_channel *channel,
146 const struct ieee80211_ht_cap *ht_cap,
147 const struct ieee80211_ht_operation *ht_oper,
148 const struct ieee80211_vht_operation *vht_oper,
149 struct cfg80211_chan_def *chandef, bool tracking)
150 {
151 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
152 struct cfg80211_chan_def vht_chandef;
153 struct ieee80211_sta_ht_cap sta_ht_cap;
154 u32 ht_cfreq, ret;
155
156 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
157 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
158
159 chandef->chan = channel;
160 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
161 chandef->center_freq1 = channel->center_freq;
162 chandef->center_freq2 = 0;
163
164 if (!ht_cap || !ht_oper || !sta_ht_cap.ht_supported) {
165 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
166 goto out;
167 }
168
169 chandef->width = NL80211_CHAN_WIDTH_20;
170
171 if (!(ht_cap->cap_info &
172 cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40))) {
173 ret = IEEE80211_STA_DISABLE_40MHZ;
174 vht_chandef = *chandef;
175 goto out;
176 }
177
178 ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
179 channel->band);
180 /* check that channel matches the right operating channel */
181 if (!tracking && channel->center_freq != ht_cfreq) {
182 /*
183 * It's possible that some APs are confused here;
184 * Netgear WNDR3700 sometimes reports 4 higher than
185 * the actual channel in association responses, but
186 * since we look at probe response/beacon data here
187 * it should be OK.
188 */
189 sdata_info(sdata,
190 "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
191 channel->center_freq, ht_cfreq,
192 ht_oper->primary_chan, channel->band);
193 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
194 goto out;
195 }
196
197 /* check 40 MHz support, if we have it */
198 if (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
199 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
200 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
201 chandef->width = NL80211_CHAN_WIDTH_40;
202 chandef->center_freq1 += 10;
203 break;
204 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
205 chandef->width = NL80211_CHAN_WIDTH_40;
206 chandef->center_freq1 -= 10;
207 break;
208 }
209 } else {
210 /* 40 MHz (and 80 MHz) must be supported for VHT */
211 ret = IEEE80211_STA_DISABLE_VHT;
212 /* also mark 40 MHz disabled */
213 ret |= IEEE80211_STA_DISABLE_40MHZ;
214 goto out;
215 }
216
217 if (!vht_oper || !sband->vht_cap.vht_supported) {
218 ret = IEEE80211_STA_DISABLE_VHT;
219 goto out;
220 }
221
222 vht_chandef.chan = channel;
223 vht_chandef.center_freq1 =
224 ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx,
225 channel->band);
226 vht_chandef.center_freq2 = 0;
227
228 switch (vht_oper->chan_width) {
229 case IEEE80211_VHT_CHANWIDTH_USE_HT:
230 vht_chandef.width = chandef->width;
231 vht_chandef.center_freq1 = chandef->center_freq1;
232 break;
233 case IEEE80211_VHT_CHANWIDTH_80MHZ:
234 vht_chandef.width = NL80211_CHAN_WIDTH_80;
235 break;
236 case IEEE80211_VHT_CHANWIDTH_160MHZ:
237 vht_chandef.width = NL80211_CHAN_WIDTH_160;
238 break;
239 case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
240 vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
241 vht_chandef.center_freq2 =
242 ieee80211_channel_to_frequency(
243 vht_oper->center_freq_seg2_idx,
244 channel->band);
245 break;
246 default:
247 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
248 sdata_info(sdata,
249 "AP VHT operation IE has invalid channel width (%d), disable VHT\n",
250 vht_oper->chan_width);
251 ret = IEEE80211_STA_DISABLE_VHT;
252 goto out;
253 }
254
255 if (!cfg80211_chandef_valid(&vht_chandef)) {
256 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
257 sdata_info(sdata,
258 "AP VHT information is invalid, disable VHT\n");
259 ret = IEEE80211_STA_DISABLE_VHT;
260 goto out;
261 }
262
263 if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
264 ret = 0;
265 goto out;
266 }
267
268 if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
269 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
270 sdata_info(sdata,
271 "AP VHT information doesn't match HT, disable VHT\n");
272 ret = IEEE80211_STA_DISABLE_VHT;
273 goto out;
274 }
275
276 *chandef = vht_chandef;
277
278 ret = 0;
279
280 out:
281 /*
282 * When tracking the current AP, don't do any further checks if the
283 * new chandef is identical to the one we're currently using for the
284 * connection. This keeps us from playing ping-pong with regulatory,
285 * without it the following can happen (for example):
286 * - connect to an AP with 80 MHz, world regdom allows 80 MHz
287 * - AP advertises regdom US
288 * - CRDA loads regdom US with 80 MHz prohibited (old database)
289 * - the code below detects an unsupported channel, downgrades, and
290 * we disconnect from the AP in the caller
291 * - disconnect causes CRDA to reload world regdomain and the game
292 * starts anew.
293 * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
294 *
295 * It seems possible that there are still scenarios with CSA or real
296 * bandwidth changes where a this could happen, but those cases are
297 * less common and wouldn't completely prevent using the AP.
298 */
299 if (tracking &&
300 cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
301 return ret;
302
303 /* don't print the message below for VHT mismatch if VHT is disabled */
304 if (ret & IEEE80211_STA_DISABLE_VHT)
305 vht_chandef = *chandef;
306
307 /*
308 * Ignore the DISABLED flag when we're already connected and only
309 * tracking the APs beacon for bandwidth changes - otherwise we
310 * might get disconnected here if we connect to an AP, update our
311 * regulatory information based on the AP's country IE and the
312 * information we have is wrong/outdated and disables the channel
313 * that we're actually using for the connection to the AP.
314 */
315 while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
316 tracking ? 0 :
317 IEEE80211_CHAN_DISABLED)) {
318 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
319 ret = IEEE80211_STA_DISABLE_HT |
320 IEEE80211_STA_DISABLE_VHT;
321 break;
322 }
323
324 ret |= ieee80211_chandef_downgrade(chandef);
325 }
326
327 if (chandef->width != vht_chandef.width && !tracking)
328 sdata_info(sdata,
329 "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
330
331 WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
332 return ret;
333 }
334
335 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
336 struct sta_info *sta,
337 const struct ieee80211_ht_cap *ht_cap,
338 const struct ieee80211_ht_operation *ht_oper,
339 const struct ieee80211_vht_operation *vht_oper,
340 const u8 *bssid, u32 *changed)
341 {
342 struct ieee80211_local *local = sdata->local;
343 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
344 struct ieee80211_supported_band *sband;
345 struct ieee80211_channel *chan;
346 struct cfg80211_chan_def chandef;
347 u16 ht_opmode;
348 u32 flags;
349 enum ieee80211_sta_rx_bandwidth new_sta_bw;
350 int ret;
351
352 /* if HT was/is disabled, don't track any bandwidth changes */
353 if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
354 return 0;
355
356 /* don't check VHT if we associated as non-VHT station */
357 if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
358 vht_oper = NULL;
359
360 if (WARN_ON_ONCE(!sta))
361 return -EINVAL;
362
363 /*
364 * if bss configuration changed store the new one -
365 * this may be applicable even if channel is identical
366 */
367 ht_opmode = le16_to_cpu(ht_oper->operation_mode);
368 if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
369 *changed |= BSS_CHANGED_HT;
370 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
371 }
372
373 chan = sdata->vif.bss_conf.chandef.chan;
374 sband = local->hw.wiphy->bands[chan->band];
375
376 /* calculate new channel (type) based on HT/VHT operation IEs */
377 flags = ieee80211_determine_chantype(sdata, sband, chan,
378 ht_cap, ht_oper, vht_oper,
379 &chandef, true);
380
381 /*
382 * Downgrade the new channel if we associated with restricted
383 * capabilities. For example, if we associated as a 20 MHz STA
384 * to a 40 MHz AP (due to regulatory, capabilities or config
385 * reasons) then switching to a 40 MHz channel now won't do us
386 * any good -- we couldn't use it with the AP.
387 */
388 if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
389 chandef.width == NL80211_CHAN_WIDTH_80P80)
390 flags |= ieee80211_chandef_downgrade(&chandef);
391 if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
392 chandef.width == NL80211_CHAN_WIDTH_160)
393 flags |= ieee80211_chandef_downgrade(&chandef);
394 if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
395 chandef.width > NL80211_CHAN_WIDTH_20)
396 flags |= ieee80211_chandef_downgrade(&chandef);
397
398 if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
399 return 0;
400
401 sdata_info(sdata,
402 "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
403 ifmgd->bssid, chandef.chan->center_freq, chandef.width,
404 chandef.center_freq1, chandef.center_freq2);
405
406 if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
407 IEEE80211_STA_DISABLE_VHT |
408 IEEE80211_STA_DISABLE_40MHZ |
409 IEEE80211_STA_DISABLE_80P80MHZ |
410 IEEE80211_STA_DISABLE_160MHZ)) ||
411 !cfg80211_chandef_valid(&chandef)) {
412 sdata_info(sdata,
413 "AP %pM changed bandwidth in a way we can't support - disconnect\n",
414 ifmgd->bssid);
415 return -EINVAL;
416 }
417
418 switch (chandef.width) {
419 case NL80211_CHAN_WIDTH_20_NOHT:
420 case NL80211_CHAN_WIDTH_20:
421 new_sta_bw = IEEE80211_STA_RX_BW_20;
422 break;
423 case NL80211_CHAN_WIDTH_40:
424 new_sta_bw = IEEE80211_STA_RX_BW_40;
425 break;
426 case NL80211_CHAN_WIDTH_80:
427 new_sta_bw = IEEE80211_STA_RX_BW_80;
428 break;
429 case NL80211_CHAN_WIDTH_80P80:
430 case NL80211_CHAN_WIDTH_160:
431 new_sta_bw = IEEE80211_STA_RX_BW_160;
432 break;
433 default:
434 return -EINVAL;
435 }
436
437 if (new_sta_bw > sta->cur_max_bandwidth)
438 new_sta_bw = sta->cur_max_bandwidth;
439
440 if (new_sta_bw < sta->sta.bandwidth) {
441 sta->sta.bandwidth = new_sta_bw;
442 rate_control_rate_update(local, sband, sta,
443 IEEE80211_RC_BW_CHANGED);
444 }
445
446 ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
447 if (ret) {
448 sdata_info(sdata,
449 "AP %pM changed bandwidth to incompatible one - disconnect\n",
450 ifmgd->bssid);
451 return ret;
452 }
453
454 if (new_sta_bw > sta->sta.bandwidth) {
455 sta->sta.bandwidth = new_sta_bw;
456 rate_control_rate_update(local, sband, sta,
457 IEEE80211_RC_BW_CHANGED);
458 }
459
460 return 0;
461 }
462
463 /* frame sending functions */
464
465 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
466 struct sk_buff *skb, u8 ap_ht_param,
467 struct ieee80211_supported_band *sband,
468 struct ieee80211_channel *channel,
469 enum ieee80211_smps_mode smps)
470 {
471 u8 *pos;
472 u32 flags = channel->flags;
473 u16 cap;
474 struct ieee80211_sta_ht_cap ht_cap;
475
476 BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
477
478 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
479 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
480
481 /* determine capability flags */
482 cap = ht_cap.cap;
483
484 switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
485 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
486 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
487 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
488 cap &= ~IEEE80211_HT_CAP_SGI_40;
489 }
490 break;
491 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
492 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
493 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
494 cap &= ~IEEE80211_HT_CAP_SGI_40;
495 }
496 break;
497 }
498
499 /*
500 * If 40 MHz was disabled associate as though we weren't
501 * capable of 40 MHz -- some broken APs will never fall
502 * back to trying to transmit in 20 MHz.
503 */
504 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
505 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
506 cap &= ~IEEE80211_HT_CAP_SGI_40;
507 }
508
509 /* set SM PS mode properly */
510 cap &= ~IEEE80211_HT_CAP_SM_PS;
511 switch (smps) {
512 case IEEE80211_SMPS_AUTOMATIC:
513 case IEEE80211_SMPS_NUM_MODES:
514 WARN_ON(1);
515 case IEEE80211_SMPS_OFF:
516 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
517 IEEE80211_HT_CAP_SM_PS_SHIFT;
518 break;
519 case IEEE80211_SMPS_STATIC:
520 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
521 IEEE80211_HT_CAP_SM_PS_SHIFT;
522 break;
523 case IEEE80211_SMPS_DYNAMIC:
524 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
525 IEEE80211_HT_CAP_SM_PS_SHIFT;
526 break;
527 }
528
529 /* reserve and fill IE */
530 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
531 ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
532 }
533
534 /* This function determines vht capability flags for the association
535 * and builds the IE.
536 * Note - the function may set the owner of the MU-MIMO capability
537 */
538 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
539 struct sk_buff *skb,
540 struct ieee80211_supported_band *sband,
541 struct ieee80211_vht_cap *ap_vht_cap)
542 {
543 struct ieee80211_local *local = sdata->local;
544 u8 *pos;
545 u32 cap;
546 struct ieee80211_sta_vht_cap vht_cap;
547 u32 mask, ap_bf_sts, our_bf_sts;
548
549 BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
550
551 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
552 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
553
554 /* determine capability flags */
555 cap = vht_cap.cap;
556
557 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
558 u32 bw = cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
559
560 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
561 if (bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ ||
562 bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
563 cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
564 }
565
566 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
567 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
568 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
569 }
570
571 /*
572 * Some APs apparently get confused if our capabilities are better
573 * than theirs, so restrict what we advertise in the assoc request.
574 */
575 if (!(ap_vht_cap->vht_cap_info &
576 cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
577 cap &= ~(IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
578 IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE);
579 else if (!(ap_vht_cap->vht_cap_info &
580 cpu_to_le32(IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE)))
581 cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
582
583 /*
584 * If some other vif is using the MU-MIMO capablity we cannot associate
585 * using MU-MIMO - this will lead to contradictions in the group-id
586 * mechanism.
587 * Ownership is defined since association request, in order to avoid
588 * simultaneous associations with MU-MIMO.
589 */
590 if (cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE) {
591 bool disable_mu_mimo = false;
592 struct ieee80211_sub_if_data *other;
593
594 list_for_each_entry_rcu(other, &local->interfaces, list) {
595 if (other->flags & IEEE80211_SDATA_MU_MIMO_OWNER) {
596 disable_mu_mimo = true;
597 break;
598 }
599 }
600 if (disable_mu_mimo)
601 cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
602 else
603 sdata->flags |= IEEE80211_SDATA_MU_MIMO_OWNER;
604 }
605
606 mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
607
608 ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask;
609 our_bf_sts = cap & mask;
610
611 if (ap_bf_sts < our_bf_sts) {
612 cap &= ~mask;
613 cap |= ap_bf_sts;
614 }
615
616 /* reserve and fill IE */
617 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
618 ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
619 }
620
621 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
622 {
623 struct ieee80211_local *local = sdata->local;
624 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
625 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
626 struct sk_buff *skb;
627 struct ieee80211_mgmt *mgmt;
628 u8 *pos, qos_info;
629 size_t offset = 0, noffset;
630 int i, count, rates_len, supp_rates_len, shift;
631 u16 capab;
632 struct ieee80211_supported_band *sband;
633 struct ieee80211_chanctx_conf *chanctx_conf;
634 struct ieee80211_channel *chan;
635 u32 rate_flags, rates = 0;
636
637 sdata_assert_lock(sdata);
638
639 rcu_read_lock();
640 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
641 if (WARN_ON(!chanctx_conf)) {
642 rcu_read_unlock();
643 return;
644 }
645 chan = chanctx_conf->def.chan;
646 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
647 rcu_read_unlock();
648 sband = local->hw.wiphy->bands[chan->band];
649 shift = ieee80211_vif_get_shift(&sdata->vif);
650
651 if (assoc_data->supp_rates_len) {
652 /*
653 * Get all rates supported by the device and the AP as
654 * some APs don't like getting a superset of their rates
655 * in the association request (e.g. D-Link DAP 1353 in
656 * b-only mode)...
657 */
658 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
659 assoc_data->supp_rates,
660 assoc_data->supp_rates_len,
661 &rates);
662 } else {
663 /*
664 * In case AP not provide any supported rates information
665 * before association, we send information element(s) with
666 * all rates that we support.
667 */
668 rates_len = 0;
669 for (i = 0; i < sband->n_bitrates; i++) {
670 if ((rate_flags & sband->bitrates[i].flags)
671 != rate_flags)
672 continue;
673 rates |= BIT(i);
674 rates_len++;
675 }
676 }
677
678 skb = alloc_skb(local->hw.extra_tx_headroom +
679 sizeof(*mgmt) + /* bit too much but doesn't matter */
680 2 + assoc_data->ssid_len + /* SSID */
681 4 + rates_len + /* (extended) rates */
682 4 + /* power capability */
683 2 + 2 * sband->n_channels + /* supported channels */
684 2 + sizeof(struct ieee80211_ht_cap) + /* HT */
685 2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
686 assoc_data->ie_len + /* extra IEs */
687 9, /* WMM */
688 GFP_KERNEL);
689 if (!skb)
690 return;
691
692 skb_reserve(skb, local->hw.extra_tx_headroom);
693
694 capab = WLAN_CAPABILITY_ESS;
695
696 if (sband->band == IEEE80211_BAND_2GHZ) {
697 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
698 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
699 }
700
701 if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
702 capab |= WLAN_CAPABILITY_PRIVACY;
703
704 if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
705 ieee80211_hw_check(&local->hw, SPECTRUM_MGMT))
706 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
707
708 if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM)
709 capab |= WLAN_CAPABILITY_RADIO_MEASURE;
710
711 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
712 memset(mgmt, 0, 24);
713 memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
714 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
715 memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
716
717 if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
718 skb_put(skb, 10);
719 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
720 IEEE80211_STYPE_REASSOC_REQ);
721 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
722 mgmt->u.reassoc_req.listen_interval =
723 cpu_to_le16(local->hw.conf.listen_interval);
724 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
725 ETH_ALEN);
726 } else {
727 skb_put(skb, 4);
728 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
729 IEEE80211_STYPE_ASSOC_REQ);
730 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
731 mgmt->u.assoc_req.listen_interval =
732 cpu_to_le16(local->hw.conf.listen_interval);
733 }
734
735 /* SSID */
736 pos = skb_put(skb, 2 + assoc_data->ssid_len);
737 *pos++ = WLAN_EID_SSID;
738 *pos++ = assoc_data->ssid_len;
739 memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
740
741 /* add all rates which were marked to be used above */
742 supp_rates_len = rates_len;
743 if (supp_rates_len > 8)
744 supp_rates_len = 8;
745
746 pos = skb_put(skb, supp_rates_len + 2);
747 *pos++ = WLAN_EID_SUPP_RATES;
748 *pos++ = supp_rates_len;
749
750 count = 0;
751 for (i = 0; i < sband->n_bitrates; i++) {
752 if (BIT(i) & rates) {
753 int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
754 5 * (1 << shift));
755 *pos++ = (u8) rate;
756 if (++count == 8)
757 break;
758 }
759 }
760
761 if (rates_len > count) {
762 pos = skb_put(skb, rates_len - count + 2);
763 *pos++ = WLAN_EID_EXT_SUPP_RATES;
764 *pos++ = rates_len - count;
765
766 for (i++; i < sband->n_bitrates; i++) {
767 if (BIT(i) & rates) {
768 int rate;
769 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
770 5 * (1 << shift));
771 *pos++ = (u8) rate;
772 }
773 }
774 }
775
776 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT ||
777 capab & WLAN_CAPABILITY_RADIO_MEASURE) {
778 pos = skb_put(skb, 4);
779 *pos++ = WLAN_EID_PWR_CAPABILITY;
780 *pos++ = 2;
781 *pos++ = 0; /* min tx power */
782 /* max tx power */
783 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
784 }
785
786 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
787 /* TODO: get this in reg domain format */
788 pos = skb_put(skb, 2 * sband->n_channels + 2);
789 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
790 *pos++ = 2 * sband->n_channels;
791 for (i = 0; i < sband->n_channels; i++) {
792 *pos++ = ieee80211_frequency_to_channel(
793 sband->channels[i].center_freq);
794 *pos++ = 1; /* one channel in the subband*/
795 }
796 }
797
798 /* if present, add any custom IEs that go before HT */
799 if (assoc_data->ie_len) {
800 static const u8 before_ht[] = {
801 WLAN_EID_SSID,
802 WLAN_EID_SUPP_RATES,
803 WLAN_EID_EXT_SUPP_RATES,
804 WLAN_EID_PWR_CAPABILITY,
805 WLAN_EID_SUPPORTED_CHANNELS,
806 WLAN_EID_RSN,
807 WLAN_EID_QOS_CAPA,
808 WLAN_EID_RRM_ENABLED_CAPABILITIES,
809 WLAN_EID_MOBILITY_DOMAIN,
810 WLAN_EID_FAST_BSS_TRANSITION, /* reassoc only */
811 WLAN_EID_RIC_DATA, /* reassoc only */
812 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
813 };
814 static const u8 after_ric[] = {
815 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
816 WLAN_EID_HT_CAPABILITY,
817 WLAN_EID_BSS_COEX_2040,
818 WLAN_EID_EXT_CAPABILITY,
819 WLAN_EID_QOS_TRAFFIC_CAPA,
820 WLAN_EID_TIM_BCAST_REQ,
821 WLAN_EID_INTERWORKING,
822 /* 60GHz doesn't happen right now */
823 WLAN_EID_VHT_CAPABILITY,
824 WLAN_EID_OPMODE_NOTIF,
825 };
826
827 noffset = ieee80211_ie_split_ric(assoc_data->ie,
828 assoc_data->ie_len,
829 before_ht,
830 ARRAY_SIZE(before_ht),
831 after_ric,
832 ARRAY_SIZE(after_ric),
833 offset);
834 pos = skb_put(skb, noffset - offset);
835 memcpy(pos, assoc_data->ie + offset, noffset - offset);
836 offset = noffset;
837 }
838
839 if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
840 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
841 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
842
843 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
844 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
845 sband, chan, sdata->smps_mode);
846
847 /* if present, add any custom IEs that go before VHT */
848 if (assoc_data->ie_len) {
849 static const u8 before_vht[] = {
850 WLAN_EID_SSID,
851 WLAN_EID_SUPP_RATES,
852 WLAN_EID_EXT_SUPP_RATES,
853 WLAN_EID_PWR_CAPABILITY,
854 WLAN_EID_SUPPORTED_CHANNELS,
855 WLAN_EID_RSN,
856 WLAN_EID_QOS_CAPA,
857 WLAN_EID_RRM_ENABLED_CAPABILITIES,
858 WLAN_EID_MOBILITY_DOMAIN,
859 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
860 WLAN_EID_HT_CAPABILITY,
861 WLAN_EID_BSS_COEX_2040,
862 WLAN_EID_EXT_CAPABILITY,
863 WLAN_EID_QOS_TRAFFIC_CAPA,
864 WLAN_EID_TIM_BCAST_REQ,
865 WLAN_EID_INTERWORKING,
866 };
867
868 /* RIC already taken above, so no need to handle here anymore */
869 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
870 before_vht, ARRAY_SIZE(before_vht),
871 offset);
872 pos = skb_put(skb, noffset - offset);
873 memcpy(pos, assoc_data->ie + offset, noffset - offset);
874 offset = noffset;
875 }
876
877 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
878 ieee80211_add_vht_ie(sdata, skb, sband,
879 &assoc_data->ap_vht_cap);
880
881 /* if present, add any custom non-vendor IEs that go after HT */
882 if (assoc_data->ie_len) {
883 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
884 assoc_data->ie_len,
885 offset);
886 pos = skb_put(skb, noffset - offset);
887 memcpy(pos, assoc_data->ie + offset, noffset - offset);
888 offset = noffset;
889 }
890
891 if (assoc_data->wmm) {
892 if (assoc_data->uapsd) {
893 qos_info = ifmgd->uapsd_queues;
894 qos_info |= (ifmgd->uapsd_max_sp_len <<
895 IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
896 } else {
897 qos_info = 0;
898 }
899
900 pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
901 }
902
903 /* add any remaining custom (i.e. vendor specific here) IEs */
904 if (assoc_data->ie_len) {
905 noffset = assoc_data->ie_len;
906 pos = skb_put(skb, noffset - offset);
907 memcpy(pos, assoc_data->ie + offset, noffset - offset);
908 }
909
910 drv_mgd_prepare_tx(local, sdata);
911
912 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
913 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
914 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
915 IEEE80211_TX_INTFL_MLME_CONN_TX;
916 ieee80211_tx_skb(sdata, skb);
917 }
918
919 void ieee80211_send_pspoll(struct ieee80211_local *local,
920 struct ieee80211_sub_if_data *sdata)
921 {
922 struct ieee80211_pspoll *pspoll;
923 struct sk_buff *skb;
924
925 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
926 if (!skb)
927 return;
928
929 pspoll = (struct ieee80211_pspoll *) skb->data;
930 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
931
932 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
933 ieee80211_tx_skb(sdata, skb);
934 }
935
936 void ieee80211_send_nullfunc(struct ieee80211_local *local,
937 struct ieee80211_sub_if_data *sdata,
938 bool powersave)
939 {
940 struct sk_buff *skb;
941 struct ieee80211_hdr_3addr *nullfunc;
942 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
943
944 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
945 if (!skb)
946 return;
947
948 nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
949 if (powersave)
950 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
951
952 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
953 IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
954
955 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
956 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
957
958 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
959 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
960
961 ieee80211_tx_skb(sdata, skb);
962 }
963
964 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
965 struct ieee80211_sub_if_data *sdata)
966 {
967 struct sk_buff *skb;
968 struct ieee80211_hdr *nullfunc;
969 __le16 fc;
970
971 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
972 return;
973
974 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
975 if (!skb)
976 return;
977
978 skb_reserve(skb, local->hw.extra_tx_headroom);
979
980 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
981 memset(nullfunc, 0, 30);
982 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
983 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
984 nullfunc->frame_control = fc;
985 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
986 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
987 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
988 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
989
990 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
991 ieee80211_tx_skb(sdata, skb);
992 }
993
994 /* spectrum management related things */
995 static void ieee80211_chswitch_work(struct work_struct *work)
996 {
997 struct ieee80211_sub_if_data *sdata =
998 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
999 struct ieee80211_local *local = sdata->local;
1000 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1001 int ret;
1002
1003 if (!ieee80211_sdata_running(sdata))
1004 return;
1005
1006 sdata_lock(sdata);
1007 mutex_lock(&local->mtx);
1008 mutex_lock(&local->chanctx_mtx);
1009
1010 if (!ifmgd->associated)
1011 goto out;
1012
1013 if (!sdata->vif.csa_active)
1014 goto out;
1015
1016 /*
1017 * using reservation isn't immediate as it may be deferred until later
1018 * with multi-vif. once reservation is complete it will re-schedule the
1019 * work with no reserved_chanctx so verify chandef to check if it
1020 * completed successfully
1021 */
1022
1023 if (sdata->reserved_chanctx) {
1024 /*
1025 * with multi-vif csa driver may call ieee80211_csa_finish()
1026 * many times while waiting for other interfaces to use their
1027 * reservations
1028 */
1029 if (sdata->reserved_ready)
1030 goto out;
1031
1032 ret = ieee80211_vif_use_reserved_context(sdata);
1033 if (ret) {
1034 sdata_info(sdata,
1035 "failed to use reserved channel context, disconnecting (err=%d)\n",
1036 ret);
1037 ieee80211_queue_work(&sdata->local->hw,
1038 &ifmgd->csa_connection_drop_work);
1039 goto out;
1040 }
1041
1042 goto out;
1043 }
1044
1045 if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
1046 &sdata->csa_chandef)) {
1047 sdata_info(sdata,
1048 "failed to finalize channel switch, disconnecting\n");
1049 ieee80211_queue_work(&sdata->local->hw,
1050 &ifmgd->csa_connection_drop_work);
1051 goto out;
1052 }
1053
1054 /* XXX: shouldn't really modify cfg80211-owned data! */
1055 ifmgd->associated->channel = sdata->csa_chandef.chan;
1056
1057 ifmgd->csa_waiting_bcn = true;
1058
1059 ieee80211_sta_reset_beacon_monitor(sdata);
1060 ieee80211_sta_reset_conn_monitor(sdata);
1061
1062 out:
1063 mutex_unlock(&local->chanctx_mtx);
1064 mutex_unlock(&local->mtx);
1065 sdata_unlock(sdata);
1066 }
1067
1068 static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata)
1069 {
1070 struct ieee80211_local *local = sdata->local;
1071 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1072 int ret;
1073
1074 sdata_assert_lock(sdata);
1075
1076 WARN_ON(!sdata->vif.csa_active);
1077
1078 if (sdata->csa_block_tx) {
1079 ieee80211_wake_vif_queues(local, sdata,
1080 IEEE80211_QUEUE_STOP_REASON_CSA);
1081 sdata->csa_block_tx = false;
1082 }
1083
1084 sdata->vif.csa_active = false;
1085 ifmgd->csa_waiting_bcn = false;
1086
1087 ret = drv_post_channel_switch(sdata);
1088 if (ret) {
1089 sdata_info(sdata,
1090 "driver post channel switch failed, disconnecting\n");
1091 ieee80211_queue_work(&local->hw,
1092 &ifmgd->csa_connection_drop_work);
1093 return;
1094 }
1095
1096 cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef);
1097 }
1098
1099 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
1100 {
1101 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1102 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1103
1104 trace_api_chswitch_done(sdata, success);
1105 if (!success) {
1106 sdata_info(sdata,
1107 "driver channel switch failed, disconnecting\n");
1108 ieee80211_queue_work(&sdata->local->hw,
1109 &ifmgd->csa_connection_drop_work);
1110 } else {
1111 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1112 }
1113 }
1114 EXPORT_SYMBOL(ieee80211_chswitch_done);
1115
1116 static void ieee80211_chswitch_timer(unsigned long data)
1117 {
1118 struct ieee80211_sub_if_data *sdata =
1119 (struct ieee80211_sub_if_data *) data;
1120
1121 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1122 }
1123
1124 static void
1125 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1126 u64 timestamp, u32 device_timestamp,
1127 struct ieee802_11_elems *elems,
1128 bool beacon)
1129 {
1130 struct ieee80211_local *local = sdata->local;
1131 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1132 struct cfg80211_bss *cbss = ifmgd->associated;
1133 struct ieee80211_chanctx_conf *conf;
1134 struct ieee80211_chanctx *chanctx;
1135 enum ieee80211_band current_band;
1136 struct ieee80211_csa_ie csa_ie;
1137 struct ieee80211_channel_switch ch_switch;
1138 int res;
1139
1140 sdata_assert_lock(sdata);
1141
1142 if (!cbss)
1143 return;
1144
1145 if (local->scanning)
1146 return;
1147
1148 /* disregard subsequent announcements if we are already processing */
1149 if (sdata->vif.csa_active)
1150 return;
1151
1152 current_band = cbss->channel->band;
1153 memset(&csa_ie, 0, sizeof(csa_ie));
1154 res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
1155 ifmgd->flags,
1156 ifmgd->associated->bssid, &csa_ie);
1157 if (res < 0)
1158 ieee80211_queue_work(&local->hw,
1159 &ifmgd->csa_connection_drop_work);
1160 if (res)
1161 return;
1162
1163 if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1164 IEEE80211_CHAN_DISABLED)) {
1165 sdata_info(sdata,
1166 "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1167 ifmgd->associated->bssid,
1168 csa_ie.chandef.chan->center_freq,
1169 csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1170 csa_ie.chandef.center_freq2);
1171 ieee80211_queue_work(&local->hw,
1172 &ifmgd->csa_connection_drop_work);
1173 return;
1174 }
1175
1176 if (cfg80211_chandef_identical(&csa_ie.chandef,
1177 &sdata->vif.bss_conf.chandef)) {
1178 if (ifmgd->csa_ignored_same_chan)
1179 return;
1180 sdata_info(sdata,
1181 "AP %pM tries to chanswitch to same channel, ignore\n",
1182 ifmgd->associated->bssid);
1183 ifmgd->csa_ignored_same_chan = true;
1184 return;
1185 }
1186
1187 /*
1188 * Drop all TDLS peers - either we disconnect or move to a different
1189 * channel from this point on. There's no telling what our peer will do.
1190 * The TDLS WIDER_BW scenario is also problematic, as peers might now
1191 * have an incompatible wider chandef.
1192 */
1193 ieee80211_teardown_tdls_peers(sdata);
1194
1195 mutex_lock(&local->mtx);
1196 mutex_lock(&local->chanctx_mtx);
1197 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1198 lockdep_is_held(&local->chanctx_mtx));
1199 if (!conf) {
1200 sdata_info(sdata,
1201 "no channel context assigned to vif?, disconnecting\n");
1202 goto drop_connection;
1203 }
1204
1205 chanctx = container_of(conf, struct ieee80211_chanctx, conf);
1206
1207 if (local->use_chanctx &&
1208 !ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA)) {
1209 sdata_info(sdata,
1210 "driver doesn't support chan-switch with channel contexts\n");
1211 goto drop_connection;
1212 }
1213
1214 ch_switch.timestamp = timestamp;
1215 ch_switch.device_timestamp = device_timestamp;
1216 ch_switch.block_tx = csa_ie.mode;
1217 ch_switch.chandef = csa_ie.chandef;
1218 ch_switch.count = csa_ie.count;
1219
1220 if (drv_pre_channel_switch(sdata, &ch_switch)) {
1221 sdata_info(sdata,
1222 "preparing for channel switch failed, disconnecting\n");
1223 goto drop_connection;
1224 }
1225
1226 res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
1227 chanctx->mode, false);
1228 if (res) {
1229 sdata_info(sdata,
1230 "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
1231 res);
1232 goto drop_connection;
1233 }
1234 mutex_unlock(&local->chanctx_mtx);
1235
1236 sdata->vif.csa_active = true;
1237 sdata->csa_chandef = csa_ie.chandef;
1238 sdata->csa_block_tx = csa_ie.mode;
1239 ifmgd->csa_ignored_same_chan = false;
1240
1241 if (sdata->csa_block_tx)
1242 ieee80211_stop_vif_queues(local, sdata,
1243 IEEE80211_QUEUE_STOP_REASON_CSA);
1244 mutex_unlock(&local->mtx);
1245
1246 cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
1247 csa_ie.count);
1248
1249 if (local->ops->channel_switch) {
1250 /* use driver's channel switch callback */
1251 drv_channel_switch(local, sdata, &ch_switch);
1252 return;
1253 }
1254
1255 /* channel switch handled in software */
1256 if (csa_ie.count <= 1)
1257 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1258 else
1259 mod_timer(&ifmgd->chswitch_timer,
1260 TU_TO_EXP_TIME((csa_ie.count - 1) *
1261 cbss->beacon_interval));
1262 return;
1263 drop_connection:
1264 ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work);
1265 mutex_unlock(&local->chanctx_mtx);
1266 mutex_unlock(&local->mtx);
1267 }
1268
1269 static bool
1270 ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
1271 struct ieee80211_channel *channel,
1272 const u8 *country_ie, u8 country_ie_len,
1273 const u8 *pwr_constr_elem,
1274 int *chan_pwr, int *pwr_reduction)
1275 {
1276 struct ieee80211_country_ie_triplet *triplet;
1277 int chan = ieee80211_frequency_to_channel(channel->center_freq);
1278 int i, chan_increment;
1279 bool have_chan_pwr = false;
1280
1281 /* Invalid IE */
1282 if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1283 return false;
1284
1285 triplet = (void *)(country_ie + 3);
1286 country_ie_len -= 3;
1287
1288 switch (channel->band) {
1289 default:
1290 WARN_ON_ONCE(1);
1291 /* fall through */
1292 case IEEE80211_BAND_2GHZ:
1293 case IEEE80211_BAND_60GHZ:
1294 chan_increment = 1;
1295 break;
1296 case IEEE80211_BAND_5GHZ:
1297 chan_increment = 4;
1298 break;
1299 }
1300
1301 /* find channel */
1302 while (country_ie_len >= 3) {
1303 u8 first_channel = triplet->chans.first_channel;
1304
1305 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1306 goto next;
1307
1308 for (i = 0; i < triplet->chans.num_channels; i++) {
1309 if (first_channel + i * chan_increment == chan) {
1310 have_chan_pwr = true;
1311 *chan_pwr = triplet->chans.max_power;
1312 break;
1313 }
1314 }
1315 if (have_chan_pwr)
1316 break;
1317
1318 next:
1319 triplet++;
1320 country_ie_len -= 3;
1321 }
1322
1323 if (have_chan_pwr && pwr_constr_elem)
1324 *pwr_reduction = *pwr_constr_elem;
1325 else
1326 *pwr_reduction = 0;
1327
1328 return have_chan_pwr;
1329 }
1330
1331 static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata,
1332 struct ieee80211_channel *channel,
1333 const u8 *cisco_dtpc_ie,
1334 int *pwr_level)
1335 {
1336 /* From practical testing, the first data byte of the DTPC element
1337 * seems to contain the requested dBm level, and the CLI on Cisco
1338 * APs clearly state the range is -127 to 127 dBm, which indicates
1339 * a signed byte, although it seemingly never actually goes negative.
1340 * The other byte seems to always be zero.
1341 */
1342 *pwr_level = (__s8)cisco_dtpc_ie[4];
1343 }
1344
1345 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1346 struct ieee80211_channel *channel,
1347 struct ieee80211_mgmt *mgmt,
1348 const u8 *country_ie, u8 country_ie_len,
1349 const u8 *pwr_constr_ie,
1350 const u8 *cisco_dtpc_ie)
1351 {
1352 bool has_80211h_pwr = false, has_cisco_pwr = false;
1353 int chan_pwr = 0, pwr_reduction_80211h = 0;
1354 int pwr_level_cisco, pwr_level_80211h;
1355 int new_ap_level;
1356 __le16 capab = mgmt->u.probe_resp.capab_info;
1357
1358 if (country_ie &&
1359 (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) ||
1360 capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) {
1361 has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
1362 sdata, channel, country_ie, country_ie_len,
1363 pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1364 pwr_level_80211h =
1365 max_t(int, 0, chan_pwr - pwr_reduction_80211h);
1366 }
1367
1368 if (cisco_dtpc_ie) {
1369 ieee80211_find_cisco_dtpc(
1370 sdata, channel, cisco_dtpc_ie, &pwr_level_cisco);
1371 has_cisco_pwr = true;
1372 }
1373
1374 if (!has_80211h_pwr && !has_cisco_pwr)
1375 return 0;
1376
1377 /* If we have both 802.11h and Cisco DTPC, apply both limits
1378 * by picking the smallest of the two power levels advertised.
1379 */
1380 if (has_80211h_pwr &&
1381 (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) {
1382 sdata_dbg(sdata,
1383 "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1384 pwr_level_80211h, chan_pwr, pwr_reduction_80211h,
1385 sdata->u.mgd.bssid);
1386 new_ap_level = pwr_level_80211h;
1387 } else { /* has_cisco_pwr is always true here. */
1388 sdata_dbg(sdata,
1389 "Limiting TX power to %d dBm as advertised by %pM\n",
1390 pwr_level_cisco, sdata->u.mgd.bssid);
1391 new_ap_level = pwr_level_cisco;
1392 }
1393
1394 if (sdata->ap_power_level == new_ap_level)
1395 return 0;
1396
1397 sdata->ap_power_level = new_ap_level;
1398 if (__ieee80211_recalc_txpower(sdata))
1399 return BSS_CHANGED_TXPOWER;
1400 return 0;
1401 }
1402
1403 /* powersave */
1404 static void ieee80211_enable_ps(struct ieee80211_local *local,
1405 struct ieee80211_sub_if_data *sdata)
1406 {
1407 struct ieee80211_conf *conf = &local->hw.conf;
1408
1409 /*
1410 * If we are scanning right now then the parameters will
1411 * take effect when scan finishes.
1412 */
1413 if (local->scanning)
1414 return;
1415
1416 if (conf->dynamic_ps_timeout > 0 &&
1417 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) {
1418 mod_timer(&local->dynamic_ps_timer, jiffies +
1419 msecs_to_jiffies(conf->dynamic_ps_timeout));
1420 } else {
1421 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
1422 ieee80211_send_nullfunc(local, sdata, true);
1423
1424 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1425 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
1426 return;
1427
1428 conf->flags |= IEEE80211_CONF_PS;
1429 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1430 }
1431 }
1432
1433 static void ieee80211_change_ps(struct ieee80211_local *local)
1434 {
1435 struct ieee80211_conf *conf = &local->hw.conf;
1436
1437 if (local->ps_sdata) {
1438 ieee80211_enable_ps(local, local->ps_sdata);
1439 } else if (conf->flags & IEEE80211_CONF_PS) {
1440 conf->flags &= ~IEEE80211_CONF_PS;
1441 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1442 del_timer_sync(&local->dynamic_ps_timer);
1443 cancel_work_sync(&local->dynamic_ps_enable_work);
1444 }
1445 }
1446
1447 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1448 {
1449 struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1450 struct sta_info *sta = NULL;
1451 bool authorized = false;
1452
1453 if (!mgd->powersave)
1454 return false;
1455
1456 if (mgd->broken_ap)
1457 return false;
1458
1459 if (!mgd->associated)
1460 return false;
1461
1462 if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1463 return false;
1464
1465 if (!mgd->have_beacon)
1466 return false;
1467
1468 rcu_read_lock();
1469 sta = sta_info_get(sdata, mgd->bssid);
1470 if (sta)
1471 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1472 rcu_read_unlock();
1473
1474 return authorized;
1475 }
1476
1477 /* need to hold RTNL or interface lock */
1478 void ieee80211_recalc_ps(struct ieee80211_local *local)
1479 {
1480 struct ieee80211_sub_if_data *sdata, *found = NULL;
1481 int count = 0;
1482 int timeout;
1483
1484 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) {
1485 local->ps_sdata = NULL;
1486 return;
1487 }
1488
1489 list_for_each_entry(sdata, &local->interfaces, list) {
1490 if (!ieee80211_sdata_running(sdata))
1491 continue;
1492 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1493 /* If an AP vif is found, then disable PS
1494 * by setting the count to zero thereby setting
1495 * ps_sdata to NULL.
1496 */
1497 count = 0;
1498 break;
1499 }
1500 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1501 continue;
1502 found = sdata;
1503 count++;
1504 }
1505
1506 if (count == 1 && ieee80211_powersave_allowed(found)) {
1507 u8 dtimper = found->u.mgd.dtim_period;
1508 s32 beaconint_us;
1509
1510 beaconint_us = ieee80211_tu_to_usec(
1511 found->vif.bss_conf.beacon_int);
1512
1513 timeout = local->dynamic_ps_forced_timeout;
1514 if (timeout < 0)
1515 timeout = 100;
1516 local->hw.conf.dynamic_ps_timeout = timeout;
1517
1518 /* If the TIM IE is invalid, pretend the value is 1 */
1519 if (!dtimper)
1520 dtimper = 1;
1521
1522 local->hw.conf.ps_dtim_period = dtimper;
1523 local->ps_sdata = found;
1524 } else {
1525 local->ps_sdata = NULL;
1526 }
1527
1528 ieee80211_change_ps(local);
1529 }
1530
1531 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1532 {
1533 bool ps_allowed = ieee80211_powersave_allowed(sdata);
1534
1535 if (sdata->vif.bss_conf.ps != ps_allowed) {
1536 sdata->vif.bss_conf.ps = ps_allowed;
1537 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1538 }
1539 }
1540
1541 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1542 {
1543 struct ieee80211_local *local =
1544 container_of(work, struct ieee80211_local,
1545 dynamic_ps_disable_work);
1546
1547 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1548 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1549 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1550 }
1551
1552 ieee80211_wake_queues_by_reason(&local->hw,
1553 IEEE80211_MAX_QUEUE_MAP,
1554 IEEE80211_QUEUE_STOP_REASON_PS,
1555 false);
1556 }
1557
1558 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1559 {
1560 struct ieee80211_local *local =
1561 container_of(work, struct ieee80211_local,
1562 dynamic_ps_enable_work);
1563 struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1564 struct ieee80211_if_managed *ifmgd;
1565 unsigned long flags;
1566 int q;
1567
1568 /* can only happen when PS was just disabled anyway */
1569 if (!sdata)
1570 return;
1571
1572 ifmgd = &sdata->u.mgd;
1573
1574 if (local->hw.conf.flags & IEEE80211_CONF_PS)
1575 return;
1576
1577 if (local->hw.conf.dynamic_ps_timeout > 0) {
1578 /* don't enter PS if TX frames are pending */
1579 if (drv_tx_frames_pending(local)) {
1580 mod_timer(&local->dynamic_ps_timer, jiffies +
1581 msecs_to_jiffies(
1582 local->hw.conf.dynamic_ps_timeout));
1583 return;
1584 }
1585
1586 /*
1587 * transmission can be stopped by others which leads to
1588 * dynamic_ps_timer expiry. Postpone the ps timer if it
1589 * is not the actual idle state.
1590 */
1591 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1592 for (q = 0; q < local->hw.queues; q++) {
1593 if (local->queue_stop_reasons[q]) {
1594 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1595 flags);
1596 mod_timer(&local->dynamic_ps_timer, jiffies +
1597 msecs_to_jiffies(
1598 local->hw.conf.dynamic_ps_timeout));
1599 return;
1600 }
1601 }
1602 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1603 }
1604
1605 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1606 !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1607 if (drv_tx_frames_pending(local)) {
1608 mod_timer(&local->dynamic_ps_timer, jiffies +
1609 msecs_to_jiffies(
1610 local->hw.conf.dynamic_ps_timeout));
1611 } else {
1612 ieee80211_send_nullfunc(local, sdata, true);
1613 /* Flush to get the tx status of nullfunc frame */
1614 ieee80211_flush_queues(local, sdata, false);
1615 }
1616 }
1617
1618 if (!(ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
1619 ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) ||
1620 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1621 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1622 local->hw.conf.flags |= IEEE80211_CONF_PS;
1623 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1624 }
1625 }
1626
1627 void ieee80211_dynamic_ps_timer(unsigned long data)
1628 {
1629 struct ieee80211_local *local = (void *) data;
1630
1631 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1632 }
1633
1634 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1635 {
1636 struct delayed_work *delayed_work =
1637 container_of(work, struct delayed_work, work);
1638 struct ieee80211_sub_if_data *sdata =
1639 container_of(delayed_work, struct ieee80211_sub_if_data,
1640 dfs_cac_timer_work);
1641 struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1642
1643 mutex_lock(&sdata->local->mtx);
1644 if (sdata->wdev.cac_started) {
1645 ieee80211_vif_release_channel(sdata);
1646 cfg80211_cac_event(sdata->dev, &chandef,
1647 NL80211_RADAR_CAC_FINISHED,
1648 GFP_KERNEL);
1649 }
1650 mutex_unlock(&sdata->local->mtx);
1651 }
1652
1653 static bool
1654 __ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1655 {
1656 struct ieee80211_local *local = sdata->local;
1657 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1658 bool ret = false;
1659 int ac;
1660
1661 if (local->hw.queues < IEEE80211_NUM_ACS)
1662 return false;
1663
1664 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1665 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
1666 int non_acm_ac;
1667 unsigned long now = jiffies;
1668
1669 if (tx_tspec->action == TX_TSPEC_ACTION_NONE &&
1670 tx_tspec->admitted_time &&
1671 time_after(now, tx_tspec->time_slice_start + HZ)) {
1672 tx_tspec->consumed_tx_time = 0;
1673 tx_tspec->time_slice_start = now;
1674
1675 if (tx_tspec->downgraded)
1676 tx_tspec->action =
1677 TX_TSPEC_ACTION_STOP_DOWNGRADE;
1678 }
1679
1680 switch (tx_tspec->action) {
1681 case TX_TSPEC_ACTION_STOP_DOWNGRADE:
1682 /* take the original parameters */
1683 if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac]))
1684 sdata_err(sdata,
1685 "failed to set TX queue parameters for queue %d\n",
1686 ac);
1687 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1688 tx_tspec->downgraded = false;
1689 ret = true;
1690 break;
1691 case TX_TSPEC_ACTION_DOWNGRADE:
1692 if (time_after(now, tx_tspec->time_slice_start + HZ)) {
1693 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1694 ret = true;
1695 break;
1696 }
1697 /* downgrade next lower non-ACM AC */
1698 for (non_acm_ac = ac + 1;
1699 non_acm_ac < IEEE80211_NUM_ACS;
1700 non_acm_ac++)
1701 if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac)))
1702 break;
1703 /* The loop will result in using BK even if it requires
1704 * admission control, such configuration makes no sense
1705 * and we have to transmit somehow - the AC selection
1706 * does the same thing.
1707 */
1708 if (drv_conf_tx(local, sdata, ac,
1709 &sdata->tx_conf[non_acm_ac]))
1710 sdata_err(sdata,
1711 "failed to set TX queue parameters for queue %d\n",
1712 ac);
1713 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1714 ret = true;
1715 schedule_delayed_work(&ifmgd->tx_tspec_wk,
1716 tx_tspec->time_slice_start + HZ - now + 1);
1717 break;
1718 case TX_TSPEC_ACTION_NONE:
1719 /* nothing now */
1720 break;
1721 }
1722 }
1723
1724 return ret;
1725 }
1726
1727 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1728 {
1729 if (__ieee80211_sta_handle_tspec_ac_params(sdata))
1730 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
1731 }
1732
1733 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work)
1734 {
1735 struct ieee80211_sub_if_data *sdata;
1736
1737 sdata = container_of(work, struct ieee80211_sub_if_data,
1738 u.mgd.tx_tspec_wk.work);
1739 ieee80211_sta_handle_tspec_ac_params(sdata);
1740 }
1741
1742 /* MLME */
1743 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1744 struct ieee80211_sub_if_data *sdata,
1745 const u8 *wmm_param, size_t wmm_param_len)
1746 {
1747 struct ieee80211_tx_queue_params params[IEEE80211_NUM_ACS];
1748 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1749 size_t left;
1750 int count, ac;
1751 const u8 *pos;
1752 u8 uapsd_queues = 0;
1753
1754 if (!local->ops->conf_tx)
1755 return false;
1756
1757 if (local->hw.queues < IEEE80211_NUM_ACS)
1758 return false;
1759
1760 if (!wmm_param)
1761 return false;
1762
1763 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1764 return false;
1765
1766 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1767 uapsd_queues = ifmgd->uapsd_queues;
1768
1769 count = wmm_param[6] & 0x0f;
1770 if (count == ifmgd->wmm_last_param_set)
1771 return false;
1772 ifmgd->wmm_last_param_set = count;
1773
1774 pos = wmm_param + 8;
1775 left = wmm_param_len - 8;
1776
1777 memset(&params, 0, sizeof(params));
1778
1779 sdata->wmm_acm = 0;
1780 for (; left >= 4; left -= 4, pos += 4) {
1781 int aci = (pos[0] >> 5) & 0x03;
1782 int acm = (pos[0] >> 4) & 0x01;
1783 bool uapsd = false;
1784
1785 switch (aci) {
1786 case 1: /* AC_BK */
1787 ac = IEEE80211_AC_BK;
1788 if (acm)
1789 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1790 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1791 uapsd = true;
1792 break;
1793 case 2: /* AC_VI */
1794 ac = IEEE80211_AC_VI;
1795 if (acm)
1796 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1797 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1798 uapsd = true;
1799 break;
1800 case 3: /* AC_VO */
1801 ac = IEEE80211_AC_VO;
1802 if (acm)
1803 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1804 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1805 uapsd = true;
1806 break;
1807 case 0: /* AC_BE */
1808 default:
1809 ac = IEEE80211_AC_BE;
1810 if (acm)
1811 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1812 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1813 uapsd = true;
1814 break;
1815 }
1816
1817 params[ac].aifs = pos[0] & 0x0f;
1818
1819 if (params[ac].aifs < 2) {
1820 sdata_info(sdata,
1821 "AP has invalid WMM params (AIFSN=%d for ACI %d), will use 2\n",
1822 params[ac].aifs, aci);
1823 params[ac].aifs = 2;
1824 }
1825 params[ac].cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1826 params[ac].cw_min = ecw2cw(pos[1] & 0x0f);
1827 params[ac].txop = get_unaligned_le16(pos + 2);
1828 params[ac].acm = acm;
1829 params[ac].uapsd = uapsd;
1830
1831 if (params[ac].cw_min > params[ac].cw_max) {
1832 sdata_info(sdata,
1833 "AP has invalid WMM params (CWmin/max=%d/%d for ACI %d), using defaults\n",
1834 params[ac].cw_min, params[ac].cw_max, aci);
1835 return false;
1836 }
1837 }
1838
1839 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1840 mlme_dbg(sdata,
1841 "WMM AC=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n",
1842 ac, params[ac].acm,
1843 params[ac].aifs, params[ac].cw_min, params[ac].cw_max,
1844 params[ac].txop, params[ac].uapsd,
1845 ifmgd->tx_tspec[ac].downgraded);
1846 sdata->tx_conf[ac] = params[ac];
1847 if (!ifmgd->tx_tspec[ac].downgraded &&
1848 drv_conf_tx(local, sdata, ac, &params[ac]))
1849 sdata_err(sdata,
1850 "failed to set TX queue parameters for AC %d\n",
1851 ac);
1852 }
1853
1854 /* enable WMM or activate new settings */
1855 sdata->vif.bss_conf.qos = true;
1856 return true;
1857 }
1858
1859 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1860 {
1861 lockdep_assert_held(&sdata->local->mtx);
1862
1863 sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1864 ieee80211_run_deferred_scan(sdata->local);
1865 }
1866
1867 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1868 {
1869 mutex_lock(&sdata->local->mtx);
1870 __ieee80211_stop_poll(sdata);
1871 mutex_unlock(&sdata->local->mtx);
1872 }
1873
1874 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1875 u16 capab, bool erp_valid, u8 erp)
1876 {
1877 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1878 u32 changed = 0;
1879 bool use_protection;
1880 bool use_short_preamble;
1881 bool use_short_slot;
1882
1883 if (erp_valid) {
1884 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1885 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1886 } else {
1887 use_protection = false;
1888 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1889 }
1890
1891 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1892 if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1893 use_short_slot = true;
1894
1895 if (use_protection != bss_conf->use_cts_prot) {
1896 bss_conf->use_cts_prot = use_protection;
1897 changed |= BSS_CHANGED_ERP_CTS_PROT;
1898 }
1899
1900 if (use_short_preamble != bss_conf->use_short_preamble) {
1901 bss_conf->use_short_preamble = use_short_preamble;
1902 changed |= BSS_CHANGED_ERP_PREAMBLE;
1903 }
1904
1905 if (use_short_slot != bss_conf->use_short_slot) {
1906 bss_conf->use_short_slot = use_short_slot;
1907 changed |= BSS_CHANGED_ERP_SLOT;
1908 }
1909
1910 return changed;
1911 }
1912
1913 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1914 struct cfg80211_bss *cbss,
1915 u32 bss_info_changed)
1916 {
1917 struct ieee80211_bss *bss = (void *)cbss->priv;
1918 struct ieee80211_local *local = sdata->local;
1919 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1920
1921 bss_info_changed |= BSS_CHANGED_ASSOC;
1922 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1923 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1924
1925 sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1926 beacon_loss_count * bss_conf->beacon_int));
1927
1928 sdata->u.mgd.associated = cbss;
1929 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1930
1931 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1932
1933 if (sdata->vif.p2p) {
1934 const struct cfg80211_bss_ies *ies;
1935
1936 rcu_read_lock();
1937 ies = rcu_dereference(cbss->ies);
1938 if (ies) {
1939 int ret;
1940
1941 ret = cfg80211_get_p2p_attr(
1942 ies->data, ies->len,
1943 IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1944 (u8 *) &bss_conf->p2p_noa_attr,
1945 sizeof(bss_conf->p2p_noa_attr));
1946 if (ret >= 2) {
1947 sdata->u.mgd.p2p_noa_index =
1948 bss_conf->p2p_noa_attr.index;
1949 bss_info_changed |= BSS_CHANGED_P2P_PS;
1950 }
1951 }
1952 rcu_read_unlock();
1953 }
1954
1955 /* just to be sure */
1956 ieee80211_stop_poll(sdata);
1957
1958 ieee80211_led_assoc(local, 1);
1959
1960 if (sdata->u.mgd.have_beacon) {
1961 /*
1962 * If the AP is buggy we may get here with no DTIM period
1963 * known, so assume it's 1 which is the only safe assumption
1964 * in that case, although if the TIM IE is broken powersave
1965 * probably just won't work at all.
1966 */
1967 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1968 bss_conf->beacon_rate = bss->beacon_rate;
1969 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1970 } else {
1971 bss_conf->beacon_rate = NULL;
1972 bss_conf->dtim_period = 0;
1973 }
1974
1975 bss_conf->assoc = 1;
1976
1977 /* Tell the driver to monitor connection quality (if supported) */
1978 if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1979 bss_conf->cqm_rssi_thold)
1980 bss_info_changed |= BSS_CHANGED_CQM;
1981
1982 /* Enable ARP filtering */
1983 if (bss_conf->arp_addr_cnt)
1984 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1985
1986 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1987
1988 mutex_lock(&local->iflist_mtx);
1989 ieee80211_recalc_ps(local);
1990 mutex_unlock(&local->iflist_mtx);
1991
1992 ieee80211_recalc_smps(sdata);
1993 ieee80211_recalc_ps_vif(sdata);
1994
1995 netif_carrier_on(sdata->dev);
1996 }
1997
1998 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1999 u16 stype, u16 reason, bool tx,
2000 u8 *frame_buf)
2001 {
2002 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2003 struct ieee80211_local *local = sdata->local;
2004 u32 changed = 0;
2005
2006 sdata_assert_lock(sdata);
2007
2008 if (WARN_ON_ONCE(tx && !frame_buf))
2009 return;
2010
2011 if (WARN_ON(!ifmgd->associated))
2012 return;
2013
2014 ieee80211_stop_poll(sdata);
2015
2016 ifmgd->associated = NULL;
2017 netif_carrier_off(sdata->dev);
2018
2019 /*
2020 * if we want to get out of ps before disassoc (why?) we have
2021 * to do it before sending disassoc, as otherwise the null-packet
2022 * won't be valid.
2023 */
2024 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2025 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2026 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2027 }
2028 local->ps_sdata = NULL;
2029
2030 /* disable per-vif ps */
2031 ieee80211_recalc_ps_vif(sdata);
2032
2033 /* make sure ongoing transmission finishes */
2034 synchronize_net();
2035
2036 /*
2037 * drop any frame before deauth/disassoc, this can be data or
2038 * management frame. Since we are disconnecting, we should not
2039 * insist sending these frames which can take time and delay
2040 * the disconnection and possible the roaming.
2041 */
2042 if (tx)
2043 ieee80211_flush_queues(local, sdata, true);
2044
2045 /* deauthenticate/disassociate now */
2046 if (tx || frame_buf)
2047 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
2048 reason, tx, frame_buf);
2049
2050 /* flush out frame - make sure the deauth was actually sent */
2051 if (tx)
2052 ieee80211_flush_queues(local, sdata, false);
2053
2054 /* clear bssid only after building the needed mgmt frames */
2055 eth_zero_addr(ifmgd->bssid);
2056
2057 /* remove AP and TDLS peers */
2058 sta_info_flush(sdata);
2059
2060 /* finally reset all BSS / config parameters */
2061 changed |= ieee80211_reset_erp_info(sdata);
2062
2063 ieee80211_led_assoc(local, 0);
2064 changed |= BSS_CHANGED_ASSOC;
2065 sdata->vif.bss_conf.assoc = false;
2066
2067 ifmgd->p2p_noa_index = -1;
2068 memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
2069 sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2070
2071 /* on the next assoc, re-program HT/VHT parameters */
2072 memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
2073 memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2074 memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
2075 memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2076 sdata->flags &= ~IEEE80211_SDATA_MU_MIMO_OWNER;
2077
2078 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2079
2080 del_timer_sync(&local->dynamic_ps_timer);
2081 cancel_work_sync(&local->dynamic_ps_enable_work);
2082
2083 /* Disable ARP filtering */
2084 if (sdata->vif.bss_conf.arp_addr_cnt)
2085 changed |= BSS_CHANGED_ARP_FILTER;
2086
2087 sdata->vif.bss_conf.qos = false;
2088 changed |= BSS_CHANGED_QOS;
2089
2090 /* The BSSID (not really interesting) and HT changed */
2091 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
2092 ieee80211_bss_info_change_notify(sdata, changed);
2093
2094 /* disassociated - set to defaults now */
2095 ieee80211_set_wmm_default(sdata, false, false);
2096
2097 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
2098 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
2099 del_timer_sync(&sdata->u.mgd.timer);
2100 del_timer_sync(&sdata->u.mgd.chswitch_timer);
2101
2102 sdata->vif.bss_conf.dtim_period = 0;
2103 sdata->vif.bss_conf.beacon_rate = NULL;
2104
2105 ifmgd->have_beacon = false;
2106
2107 ifmgd->flags = 0;
2108 mutex_lock(&local->mtx);
2109 ieee80211_vif_release_channel(sdata);
2110
2111 sdata->vif.csa_active = false;
2112 ifmgd->csa_waiting_bcn = false;
2113 ifmgd->csa_ignored_same_chan = false;
2114 if (sdata->csa_block_tx) {
2115 ieee80211_wake_vif_queues(local, sdata,
2116 IEEE80211_QUEUE_STOP_REASON_CSA);
2117 sdata->csa_block_tx = false;
2118 }
2119 mutex_unlock(&local->mtx);
2120
2121 /* existing TX TSPEC sessions no longer exist */
2122 memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
2123 cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);
2124
2125 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2126 }
2127
2128 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
2129 struct ieee80211_hdr *hdr)
2130 {
2131 /*
2132 * We can postpone the mgd.timer whenever receiving unicast frames
2133 * from AP because we know that the connection is working both ways
2134 * at that time. But multicast frames (and hence also beacons) must
2135 * be ignored here, because we need to trigger the timer during
2136 * data idle periods for sending the periodic probe request to the
2137 * AP we're connected to.
2138 */
2139 if (is_multicast_ether_addr(hdr->addr1))
2140 return;
2141
2142 ieee80211_sta_reset_conn_monitor(sdata);
2143 }
2144
2145 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
2146 {
2147 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2148 struct ieee80211_local *local = sdata->local;
2149
2150 mutex_lock(&local->mtx);
2151 if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
2152 goto out;
2153
2154 __ieee80211_stop_poll(sdata);
2155
2156 mutex_lock(&local->iflist_mtx);
2157 ieee80211_recalc_ps(local);
2158 mutex_unlock(&local->iflist_mtx);
2159
2160 if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
2161 goto out;
2162
2163 /*
2164 * We've received a probe response, but are not sure whether
2165 * we have or will be receiving any beacons or data, so let's
2166 * schedule the timers again, just in case.
2167 */
2168 ieee80211_sta_reset_beacon_monitor(sdata);
2169
2170 mod_timer(&ifmgd->conn_mon_timer,
2171 round_jiffies_up(jiffies +
2172 IEEE80211_CONNECTION_IDLE_TIME));
2173 out:
2174 mutex_unlock(&local->mtx);
2175 }
2176
2177 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
2178 struct ieee80211_hdr *hdr,
2179 u16 tx_time)
2180 {
2181 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2182 u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2183 int ac = ieee80211_ac_from_tid(tid);
2184 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
2185 unsigned long now = jiffies;
2186
2187 if (likely(!tx_tspec->admitted_time))
2188 return;
2189
2190 if (time_after(now, tx_tspec->time_slice_start + HZ)) {
2191 tx_tspec->consumed_tx_time = 0;
2192 tx_tspec->time_slice_start = now;
2193
2194 if (tx_tspec->downgraded) {
2195 tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE;
2196 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2197 }
2198 }
2199
2200 if (tx_tspec->downgraded)
2201 return;
2202
2203 tx_tspec->consumed_tx_time += tx_time;
2204
2205 if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) {
2206 tx_tspec->downgraded = true;
2207 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE;
2208 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2209 }
2210 }
2211
2212 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2213 struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2214 {
2215 ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);
2216
2217 if (!ieee80211_is_data(hdr->frame_control))
2218 return;
2219
2220 if (ieee80211_is_nullfunc(hdr->frame_control) &&
2221 sdata->u.mgd.probe_send_count > 0) {
2222 if (ack)
2223 ieee80211_sta_reset_conn_monitor(sdata);
2224 else
2225 sdata->u.mgd.nullfunc_failed = true;
2226 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2227 return;
2228 }
2229
2230 if (ack)
2231 ieee80211_sta_reset_conn_monitor(sdata);
2232 }
2233
2234 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
2235 {
2236 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2237 const u8 *ssid;
2238 u8 *dst = ifmgd->associated->bssid;
2239 u8 unicast_limit = max(1, max_probe_tries - 3);
2240
2241 /*
2242 * Try sending broadcast probe requests for the last three
2243 * probe requests after the first ones failed since some
2244 * buggy APs only support broadcast probe requests.
2245 */
2246 if (ifmgd->probe_send_count >= unicast_limit)
2247 dst = NULL;
2248
2249 /*
2250 * When the hardware reports an accurate Tx ACK status, it's
2251 * better to send a nullfunc frame instead of a probe request,
2252 * as it will kick us off the AP quickly if we aren't associated
2253 * anymore. The timeout will be reset if the frame is ACKed by
2254 * the AP.
2255 */
2256 ifmgd->probe_send_count++;
2257
2258 if (ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
2259 ifmgd->nullfunc_failed = false;
2260 ieee80211_send_nullfunc(sdata->local, sdata, false);
2261 } else {
2262 int ssid_len;
2263
2264 rcu_read_lock();
2265 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2266 if (WARN_ON_ONCE(ssid == NULL))
2267 ssid_len = 0;
2268 else
2269 ssid_len = ssid[1];
2270
2271 ieee80211_send_probe_req(sdata, sdata->vif.addr, dst,
2272 ssid + 2, ssid_len, NULL,
2273 0, (u32) -1, true, 0,
2274 ifmgd->associated->channel, false);
2275 rcu_read_unlock();
2276 }
2277
2278 ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2279 run_again(sdata, ifmgd->probe_timeout);
2280 }
2281
2282 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
2283 bool beacon)
2284 {
2285 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2286 bool already = false;
2287
2288 if (!ieee80211_sdata_running(sdata))
2289 return;
2290
2291 sdata_lock(sdata);
2292
2293 if (!ifmgd->associated)
2294 goto out;
2295
2296 mutex_lock(&sdata->local->mtx);
2297
2298 if (sdata->local->tmp_channel || sdata->local->scanning) {
2299 mutex_unlock(&sdata->local->mtx);
2300 goto out;
2301 }
2302
2303 if (beacon) {
2304 mlme_dbg_ratelimited(sdata,
2305 "detected beacon loss from AP (missed %d beacons) - probing\n",
2306 beacon_loss_count);
2307
2308 ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL);
2309 }
2310
2311 /*
2312 * The driver/our work has already reported this event or the
2313 * connection monitoring has kicked in and we have already sent
2314 * a probe request. Or maybe the AP died and the driver keeps
2315 * reporting until we disassociate...
2316 *
2317 * In either case we have to ignore the current call to this
2318 * function (except for setting the correct probe reason bit)
2319 * because otherwise we would reset the timer every time and
2320 * never check whether we received a probe response!
2321 */
2322 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
2323 already = true;
2324
2325 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2326
2327 mutex_unlock(&sdata->local->mtx);
2328
2329 if (already)
2330 goto out;
2331
2332 mutex_lock(&sdata->local->iflist_mtx);
2333 ieee80211_recalc_ps(sdata->local);
2334 mutex_unlock(&sdata->local->iflist_mtx);
2335
2336 ifmgd->probe_send_count = 0;
2337 ieee80211_mgd_probe_ap_send(sdata);
2338 out:
2339 sdata_unlock(sdata);
2340 }
2341
2342 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2343 struct ieee80211_vif *vif)
2344 {
2345 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2346 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2347 struct cfg80211_bss *cbss;
2348 struct sk_buff *skb;
2349 const u8 *ssid;
2350 int ssid_len;
2351
2352 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2353 return NULL;
2354
2355 sdata_assert_lock(sdata);
2356
2357 if (ifmgd->associated)
2358 cbss = ifmgd->associated;
2359 else if (ifmgd->auth_data)
2360 cbss = ifmgd->auth_data->bss;
2361 else if (ifmgd->assoc_data)
2362 cbss = ifmgd->assoc_data->bss;
2363 else
2364 return NULL;
2365
2366 rcu_read_lock();
2367 ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2368 if (WARN_ON_ONCE(ssid == NULL))
2369 ssid_len = 0;
2370 else
2371 ssid_len = ssid[1];
2372
2373 skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
2374 (u32) -1, cbss->channel,
2375 ssid + 2, ssid_len,
2376 NULL, 0, true);
2377 rcu_read_unlock();
2378
2379 return skb;
2380 }
2381 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2382
2383 static void ieee80211_report_disconnect(struct ieee80211_sub_if_data *sdata,
2384 const u8 *buf, size_t len, bool tx,
2385 u16 reason)
2386 {
2387 struct ieee80211_event event = {
2388 .type = MLME_EVENT,
2389 .u.mlme.data = tx ? DEAUTH_TX_EVENT : DEAUTH_RX_EVENT,
2390 .u.mlme.reason = reason,
2391 };
2392
2393 if (tx)
2394 cfg80211_tx_mlme_mgmt(sdata->dev, buf, len);
2395 else
2396 cfg80211_rx_mlme_mgmt(sdata->dev, buf, len);
2397
2398 drv_event_callback(sdata->local, sdata, &event);
2399 }
2400
2401 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2402 {
2403 struct ieee80211_local *local = sdata->local;
2404 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2405 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2406
2407 sdata_lock(sdata);
2408 if (!ifmgd->associated) {
2409 sdata_unlock(sdata);
2410 return;
2411 }
2412
2413 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2414 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2415 true, frame_buf);
2416 mutex_lock(&local->mtx);
2417 sdata->vif.csa_active = false;
2418 ifmgd->csa_waiting_bcn = false;
2419 if (sdata->csa_block_tx) {
2420 ieee80211_wake_vif_queues(local, sdata,
2421 IEEE80211_QUEUE_STOP_REASON_CSA);
2422 sdata->csa_block_tx = false;
2423 }
2424 mutex_unlock(&local->mtx);
2425
2426 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
2427 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2428
2429 sdata_unlock(sdata);
2430 }
2431
2432 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2433 {
2434 struct ieee80211_sub_if_data *sdata =
2435 container_of(work, struct ieee80211_sub_if_data,
2436 u.mgd.beacon_connection_loss_work);
2437 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2438
2439 if (ifmgd->associated)
2440 ifmgd->beacon_loss_count++;
2441
2442 if (ifmgd->connection_loss) {
2443 sdata_info(sdata, "Connection to AP %pM lost\n",
2444 ifmgd->bssid);
2445 __ieee80211_disconnect(sdata);
2446 } else {
2447 ieee80211_mgd_probe_ap(sdata, true);
2448 }
2449 }
2450
2451 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2452 {
2453 struct ieee80211_sub_if_data *sdata =
2454 container_of(work, struct ieee80211_sub_if_data,
2455 u.mgd.csa_connection_drop_work);
2456
2457 __ieee80211_disconnect(sdata);
2458 }
2459
2460 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2461 {
2462 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2463 struct ieee80211_hw *hw = &sdata->local->hw;
2464
2465 trace_api_beacon_loss(sdata);
2466
2467 sdata->u.mgd.connection_loss = false;
2468 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2469 }
2470 EXPORT_SYMBOL(ieee80211_beacon_loss);
2471
2472 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2473 {
2474 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2475 struct ieee80211_hw *hw = &sdata->local->hw;
2476
2477 trace_api_connection_loss(sdata);
2478
2479 sdata->u.mgd.connection_loss = true;
2480 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2481 }
2482 EXPORT_SYMBOL(ieee80211_connection_loss);
2483
2484
2485 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2486 bool assoc)
2487 {
2488 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2489
2490 sdata_assert_lock(sdata);
2491
2492 if (!assoc) {
2493 /*
2494 * we are not authenticated yet, the only timer that could be
2495 * running is the timeout for the authentication response which
2496 * which is not relevant anymore.
2497 */
2498 del_timer_sync(&sdata->u.mgd.timer);
2499 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2500
2501 eth_zero_addr(sdata->u.mgd.bssid);
2502 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2503 sdata->u.mgd.flags = 0;
2504 mutex_lock(&sdata->local->mtx);
2505 ieee80211_vif_release_channel(sdata);
2506 mutex_unlock(&sdata->local->mtx);
2507 }
2508
2509 cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2510 kfree(auth_data);
2511 sdata->u.mgd.auth_data = NULL;
2512 }
2513
2514 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2515 bool assoc)
2516 {
2517 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2518
2519 sdata_assert_lock(sdata);
2520
2521 if (!assoc) {
2522 /*
2523 * we are not associated yet, the only timer that could be
2524 * running is the timeout for the association response which
2525 * which is not relevant anymore.
2526 */
2527 del_timer_sync(&sdata->u.mgd.timer);
2528 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2529
2530 eth_zero_addr(sdata->u.mgd.bssid);
2531 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2532 sdata->u.mgd.flags = 0;
2533 sdata->flags &= ~IEEE80211_SDATA_MU_MIMO_OWNER;
2534 mutex_lock(&sdata->local->mtx);
2535 ieee80211_vif_release_channel(sdata);
2536 mutex_unlock(&sdata->local->mtx);
2537 }
2538
2539 kfree(assoc_data);
2540 sdata->u.mgd.assoc_data = NULL;
2541 }
2542
2543 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2544 struct ieee80211_mgmt *mgmt, size_t len)
2545 {
2546 struct ieee80211_local *local = sdata->local;
2547 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2548 u8 *pos;
2549 struct ieee802_11_elems elems;
2550 u32 tx_flags = 0;
2551
2552 pos = mgmt->u.auth.variable;
2553 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2554 if (!elems.challenge)
2555 return;
2556 auth_data->expected_transaction = 4;
2557 drv_mgd_prepare_tx(sdata->local, sdata);
2558 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
2559 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2560 IEEE80211_TX_INTFL_MLME_CONN_TX;
2561 ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2562 elems.challenge - 2, elems.challenge_len + 2,
2563 auth_data->bss->bssid, auth_data->bss->bssid,
2564 auth_data->key, auth_data->key_len,
2565 auth_data->key_idx, tx_flags);
2566 }
2567
2568 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2569 struct ieee80211_mgmt *mgmt, size_t len)
2570 {
2571 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2572 u8 bssid[ETH_ALEN];
2573 u16 auth_alg, auth_transaction, status_code;
2574 struct sta_info *sta;
2575 struct ieee80211_event event = {
2576 .type = MLME_EVENT,
2577 .u.mlme.data = AUTH_EVENT,
2578 };
2579
2580 sdata_assert_lock(sdata);
2581
2582 if (len < 24 + 6)
2583 return;
2584
2585 if (!ifmgd->auth_data || ifmgd->auth_data->done)
2586 return;
2587
2588 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2589
2590 if (!ether_addr_equal(bssid, mgmt->bssid))
2591 return;
2592
2593 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2594 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2595 status_code = le16_to_cpu(mgmt->u.auth.status_code);
2596
2597 if (auth_alg != ifmgd->auth_data->algorithm ||
2598 auth_transaction != ifmgd->auth_data->expected_transaction) {
2599 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2600 mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2601 auth_transaction,
2602 ifmgd->auth_data->expected_transaction);
2603 return;
2604 }
2605
2606 if (status_code != WLAN_STATUS_SUCCESS) {
2607 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2608 mgmt->sa, status_code);
2609 ieee80211_destroy_auth_data(sdata, false);
2610 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2611 event.u.mlme.status = MLME_DENIED;
2612 event.u.mlme.reason = status_code;
2613 drv_event_callback(sdata->local, sdata, &event);
2614 return;
2615 }
2616
2617 switch (ifmgd->auth_data->algorithm) {
2618 case WLAN_AUTH_OPEN:
2619 case WLAN_AUTH_LEAP:
2620 case WLAN_AUTH_FT:
2621 case WLAN_AUTH_SAE:
2622 break;
2623 case WLAN_AUTH_SHARED_KEY:
2624 if (ifmgd->auth_data->expected_transaction != 4) {
2625 ieee80211_auth_challenge(sdata, mgmt, len);
2626 /* need another frame */
2627 return;
2628 }
2629 break;
2630 default:
2631 WARN_ONCE(1, "invalid auth alg %d",
2632 ifmgd->auth_data->algorithm);
2633 return;
2634 }
2635
2636 event.u.mlme.status = MLME_SUCCESS;
2637 drv_event_callback(sdata->local, sdata, &event);
2638 sdata_info(sdata, "authenticated\n");
2639 ifmgd->auth_data->done = true;
2640 ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2641 ifmgd->auth_data->timeout_started = true;
2642 run_again(sdata, ifmgd->auth_data->timeout);
2643
2644 if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2645 ifmgd->auth_data->expected_transaction != 2) {
2646 /*
2647 * Report auth frame to user space for processing since another
2648 * round of Authentication frames is still needed.
2649 */
2650 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2651 return;
2652 }
2653
2654 /* move station state to auth */
2655 mutex_lock(&sdata->local->sta_mtx);
2656 sta = sta_info_get(sdata, bssid);
2657 if (!sta) {
2658 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2659 goto out_err;
2660 }
2661 if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2662 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2663 goto out_err;
2664 }
2665 mutex_unlock(&sdata->local->sta_mtx);
2666
2667 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2668 return;
2669 out_err:
2670 mutex_unlock(&sdata->local->sta_mtx);
2671 /* ignore frame -- wait for timeout */
2672 }
2673
2674 #define case_WLAN(type) \
2675 case WLAN_REASON_##type: return #type
2676
2677 static const char *ieee80211_get_reason_code_string(u16 reason_code)
2678 {
2679 switch (reason_code) {
2680 case_WLAN(UNSPECIFIED);
2681 case_WLAN(PREV_AUTH_NOT_VALID);
2682 case_WLAN(DEAUTH_LEAVING);
2683 case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2684 case_WLAN(DISASSOC_AP_BUSY);
2685 case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2686 case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2687 case_WLAN(DISASSOC_STA_HAS_LEFT);
2688 case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2689 case_WLAN(DISASSOC_BAD_POWER);
2690 case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2691 case_WLAN(INVALID_IE);
2692 case_WLAN(MIC_FAILURE);
2693 case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2694 case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2695 case_WLAN(IE_DIFFERENT);
2696 case_WLAN(INVALID_GROUP_CIPHER);
2697 case_WLAN(INVALID_PAIRWISE_CIPHER);
2698 case_WLAN(INVALID_AKMP);
2699 case_WLAN(UNSUPP_RSN_VERSION);
2700 case_WLAN(INVALID_RSN_IE_CAP);
2701 case_WLAN(IEEE8021X_FAILED);
2702 case_WLAN(CIPHER_SUITE_REJECTED);
2703 case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2704 case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2705 case_WLAN(DISASSOC_LOW_ACK);
2706 case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2707 case_WLAN(QSTA_LEAVE_QBSS);
2708 case_WLAN(QSTA_NOT_USE);
2709 case_WLAN(QSTA_REQUIRE_SETUP);
2710 case_WLAN(QSTA_TIMEOUT);
2711 case_WLAN(QSTA_CIPHER_NOT_SUPP);
2712 case_WLAN(MESH_PEER_CANCELED);
2713 case_WLAN(MESH_MAX_PEERS);
2714 case_WLAN(MESH_CONFIG);
2715 case_WLAN(MESH_CLOSE);
2716 case_WLAN(MESH_MAX_RETRIES);
2717 case_WLAN(MESH_CONFIRM_TIMEOUT);
2718 case_WLAN(MESH_INVALID_GTK);
2719 case_WLAN(MESH_INCONSISTENT_PARAM);
2720 case_WLAN(MESH_INVALID_SECURITY);
2721 case_WLAN(MESH_PATH_ERROR);
2722 case_WLAN(MESH_PATH_NOFORWARD);
2723 case_WLAN(MESH_PATH_DEST_UNREACHABLE);
2724 case_WLAN(MAC_EXISTS_IN_MBSS);
2725 case_WLAN(MESH_CHAN_REGULATORY);
2726 case_WLAN(MESH_CHAN);
2727 default: return "<unknown>";
2728 }
2729 }
2730
2731 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2732 struct ieee80211_mgmt *mgmt, size_t len)
2733 {
2734 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2735 u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2736
2737 sdata_assert_lock(sdata);
2738
2739 if (len < 24 + 2)
2740 return;
2741
2742 if (ifmgd->associated &&
2743 ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) {
2744 const u8 *bssid = ifmgd->associated->bssid;
2745
2746 sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
2747 bssid, reason_code,
2748 ieee80211_get_reason_code_string(reason_code));
2749
2750 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2751
2752 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false,
2753 reason_code);
2754 return;
2755 }
2756
2757 if (ifmgd->assoc_data &&
2758 ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2759 const u8 *bssid = ifmgd->assoc_data->bss->bssid;
2760
2761 sdata_info(sdata,
2762 "deauthenticated from %pM while associating (Reason: %u=%s)\n",
2763 bssid, reason_code,
2764 ieee80211_get_reason_code_string(reason_code));
2765
2766 ieee80211_destroy_assoc_data(sdata, false);
2767
2768 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2769 return;
2770 }
2771 }
2772
2773
2774 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2775 struct ieee80211_mgmt *mgmt, size_t len)
2776 {
2777 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2778 u16 reason_code;
2779
2780 sdata_assert_lock(sdata);
2781
2782 if (len < 24 + 2)
2783 return;
2784
2785 if (!ifmgd->associated ||
2786 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2787 return;
2788
2789 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2790
2791 sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2792 mgmt->sa, reason_code);
2793
2794 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2795
2796 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code);
2797 }
2798
2799 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2800 u8 *supp_rates, unsigned int supp_rates_len,
2801 u32 *rates, u32 *basic_rates,
2802 bool *have_higher_than_11mbit,
2803 int *min_rate, int *min_rate_index,
2804 int shift, u32 rate_flags)
2805 {
2806 int i, j;
2807
2808 for (i = 0; i < supp_rates_len; i++) {
2809 int rate = supp_rates[i] & 0x7f;
2810 bool is_basic = !!(supp_rates[i] & 0x80);
2811
2812 if ((rate * 5 * (1 << shift)) > 110)
2813 *have_higher_than_11mbit = true;
2814
2815 /*
2816 * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2817 * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2818 *
2819 * Note: Even through the membership selector and the basic
2820 * rate flag share the same bit, they are not exactly
2821 * the same.
2822 */
2823 if (!!(supp_rates[i] & 0x80) &&
2824 (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2825 continue;
2826
2827 for (j = 0; j < sband->n_bitrates; j++) {
2828 struct ieee80211_rate *br;
2829 int brate;
2830
2831 br = &sband->bitrates[j];
2832 if ((rate_flags & br->flags) != rate_flags)
2833 continue;
2834
2835 brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2836 if (brate == rate) {
2837 *rates |= BIT(j);
2838 if (is_basic)
2839 *basic_rates |= BIT(j);
2840 if ((rate * 5) < *min_rate) {
2841 *min_rate = rate * 5;
2842 *min_rate_index = j;
2843 }
2844 break;
2845 }
2846 }
2847 }
2848 }
2849
2850 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2851 struct cfg80211_bss *cbss,
2852 struct ieee80211_mgmt *mgmt, size_t len)
2853 {
2854 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2855 struct ieee80211_local *local = sdata->local;
2856 struct ieee80211_supported_band *sband;
2857 struct sta_info *sta;
2858 u8 *pos;
2859 u16 capab_info, aid;
2860 struct ieee802_11_elems elems;
2861 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2862 const struct cfg80211_bss_ies *bss_ies = NULL;
2863 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2864 u32 changed = 0;
2865 int err;
2866 bool ret;
2867
2868 /* AssocResp and ReassocResp have identical structure */
2869
2870 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2871 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2872
2873 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2874 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2875 aid);
2876 aid &= ~(BIT(15) | BIT(14));
2877
2878 ifmgd->broken_ap = false;
2879
2880 if (aid == 0 || aid > IEEE80211_MAX_AID) {
2881 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2882 aid);
2883 aid = 0;
2884 ifmgd->broken_ap = true;
2885 }
2886
2887 pos = mgmt->u.assoc_resp.variable;
2888 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2889
2890 if (!elems.supp_rates) {
2891 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2892 return false;
2893 }
2894
2895 ifmgd->aid = aid;
2896 ifmgd->tdls_chan_switch_prohibited =
2897 elems.ext_capab && elems.ext_capab_len >= 5 &&
2898 (elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
2899
2900 /*
2901 * Some APs are erroneously not including some information in their
2902 * (re)association response frames. Try to recover by using the data
2903 * from the beacon or probe response. This seems to afflict mobile
2904 * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2905 * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2906 */
2907 if ((assoc_data->wmm && !elems.wmm_param) ||
2908 (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2909 (!elems.ht_cap_elem || !elems.ht_operation)) ||
2910 (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2911 (!elems.vht_cap_elem || !elems.vht_operation))) {
2912 const struct cfg80211_bss_ies *ies;
2913 struct ieee802_11_elems bss_elems;
2914
2915 rcu_read_lock();
2916 ies = rcu_dereference(cbss->ies);
2917 if (ies)
2918 bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2919 GFP_ATOMIC);
2920 rcu_read_unlock();
2921 if (!bss_ies)
2922 return false;
2923
2924 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2925 false, &bss_elems);
2926 if (assoc_data->wmm &&
2927 !elems.wmm_param && bss_elems.wmm_param) {
2928 elems.wmm_param = bss_elems.wmm_param;
2929 sdata_info(sdata,
2930 "AP bug: WMM param missing from AssocResp\n");
2931 }
2932
2933 /*
2934 * Also check if we requested HT/VHT, otherwise the AP doesn't
2935 * have to include the IEs in the (re)association response.
2936 */
2937 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2938 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2939 elems.ht_cap_elem = bss_elems.ht_cap_elem;
2940 sdata_info(sdata,
2941 "AP bug: HT capability missing from AssocResp\n");
2942 }
2943 if (!elems.ht_operation && bss_elems.ht_operation &&
2944 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2945 elems.ht_operation = bss_elems.ht_operation;
2946 sdata_info(sdata,
2947 "AP bug: HT operation missing from AssocResp\n");
2948 }
2949 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2950 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2951 elems.vht_cap_elem = bss_elems.vht_cap_elem;
2952 sdata_info(sdata,
2953 "AP bug: VHT capa missing from AssocResp\n");
2954 }
2955 if (!elems.vht_operation && bss_elems.vht_operation &&
2956 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2957 elems.vht_operation = bss_elems.vht_operation;
2958 sdata_info(sdata,
2959 "AP bug: VHT operation missing from AssocResp\n");
2960 }
2961 }
2962
2963 /*
2964 * We previously checked these in the beacon/probe response, so
2965 * they should be present here. This is just a safety net.
2966 */
2967 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2968 (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2969 sdata_info(sdata,
2970 "HT AP is missing WMM params or HT capability/operation\n");
2971 ret = false;
2972 goto out;
2973 }
2974
2975 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2976 (!elems.vht_cap_elem || !elems.vht_operation)) {
2977 sdata_info(sdata,
2978 "VHT AP is missing VHT capability/operation\n");
2979 ret = false;
2980 goto out;
2981 }
2982
2983 mutex_lock(&sdata->local->sta_mtx);
2984 /*
2985 * station info was already allocated and inserted before
2986 * the association and should be available to us
2987 */
2988 sta = sta_info_get(sdata, cbss->bssid);
2989 if (WARN_ON(!sta)) {
2990 mutex_unlock(&sdata->local->sta_mtx);
2991 ret = false;
2992 goto out;
2993 }
2994
2995 sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2996
2997 /* Set up internal HT/VHT capabilities */
2998 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2999 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
3000 elems.ht_cap_elem, sta);
3001
3002 if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
3003 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
3004 elems.vht_cap_elem, sta);
3005
3006 /*
3007 * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
3008 * in their association response, so ignore that data for our own
3009 * configuration. If it changed since the last beacon, we'll get the
3010 * next beacon and update then.
3011 */
3012
3013 /*
3014 * If an operating mode notification IE is present, override the
3015 * NSS calculation (that would be done in rate_control_rate_init())
3016 * and use the # of streams from that element.
3017 */
3018 if (elems.opmode_notif &&
3019 !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
3020 u8 nss;
3021
3022 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
3023 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
3024 nss += 1;
3025 sta->sta.rx_nss = nss;
3026 }
3027
3028 rate_control_rate_init(sta);
3029
3030 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) {
3031 set_sta_flag(sta, WLAN_STA_MFP);
3032 sta->sta.mfp = true;
3033 } else {
3034 sta->sta.mfp = false;
3035 }
3036
3037 sta->sta.wme = elems.wmm_param && local->hw.queues >= IEEE80211_NUM_ACS;
3038
3039 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
3040 if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
3041 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
3042 if (err) {
3043 sdata_info(sdata,
3044 "failed to move station %pM to desired state\n",
3045 sta->sta.addr);
3046 WARN_ON(__sta_info_destroy(sta));
3047 mutex_unlock(&sdata->local->sta_mtx);
3048 ret = false;
3049 goto out;
3050 }
3051
3052 mutex_unlock(&sdata->local->sta_mtx);
3053
3054 /*
3055 * Always handle WMM once after association regardless
3056 * of the first value the AP uses. Setting -1 here has
3057 * that effect because the AP values is an unsigned
3058 * 4-bit value.
3059 */
3060 ifmgd->wmm_last_param_set = -1;
3061
3062 if (ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
3063 ieee80211_set_wmm_default(sdata, false, false);
3064 } else if (!ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3065 elems.wmm_param_len)) {
3066 /* still enable QoS since we might have HT/VHT */
3067 ieee80211_set_wmm_default(sdata, false, true);
3068 /* set the disable-WMM flag in this case to disable
3069 * tracking WMM parameter changes in the beacon if
3070 * the parameters weren't actually valid. Doing so
3071 * avoids changing parameters very strangely when
3072 * the AP is going back and forth between valid and
3073 * invalid parameters.
3074 */
3075 ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
3076 }
3077 changed |= BSS_CHANGED_QOS;
3078
3079 /* set AID and assoc capability,
3080 * ieee80211_set_associated() will tell the driver */
3081 bss_conf->aid = aid;
3082 bss_conf->assoc_capability = capab_info;
3083 ieee80211_set_associated(sdata, cbss, changed);
3084
3085 /*
3086 * If we're using 4-addr mode, let the AP know that we're
3087 * doing so, so that it can create the STA VLAN on its side
3088 */
3089 if (ifmgd->use_4addr)
3090 ieee80211_send_4addr_nullfunc(local, sdata);
3091
3092 /*
3093 * Start timer to probe the connection to the AP now.
3094 * Also start the timer that will detect beacon loss.
3095 */
3096 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
3097 ieee80211_sta_reset_beacon_monitor(sdata);
3098
3099 ret = true;
3100 out:
3101 kfree(bss_ies);
3102 return ret;
3103 }
3104
3105 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
3106 struct ieee80211_mgmt *mgmt,
3107 size_t len)
3108 {
3109 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3110 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
3111 u16 capab_info, status_code, aid;
3112 struct ieee802_11_elems elems;
3113 int ac, uapsd_queues = -1;
3114 u8 *pos;
3115 bool reassoc;
3116 struct cfg80211_bss *bss;
3117 struct ieee80211_event event = {
3118 .type = MLME_EVENT,
3119 .u.mlme.data = ASSOC_EVENT,
3120 };
3121
3122 sdata_assert_lock(sdata);
3123
3124 if (!assoc_data)
3125 return;
3126 if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3127 return;
3128
3129 /*
3130 * AssocResp and ReassocResp have identical structure, so process both
3131 * of them in this function.
3132 */
3133
3134 if (len < 24 + 6)
3135 return;
3136
3137 reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
3138 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
3139 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
3140 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
3141
3142 sdata_info(sdata,
3143 "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
3144 reassoc ? "Rea" : "A", mgmt->sa,
3145 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
3146
3147 pos = mgmt->u.assoc_resp.variable;
3148 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
3149
3150 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3151 elems.timeout_int &&
3152 elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
3153 u32 tu, ms;
3154 tu = le32_to_cpu(elems.timeout_int->value);
3155 ms = tu * 1024 / 1000;
3156 sdata_info(sdata,
3157 "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
3158 mgmt->sa, tu, ms);
3159 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3160 assoc_data->timeout_started = true;
3161 if (ms > IEEE80211_ASSOC_TIMEOUT)
3162 run_again(sdata, assoc_data->timeout);
3163 return;
3164 }
3165
3166 bss = assoc_data->bss;
3167
3168 if (status_code != WLAN_STATUS_SUCCESS) {
3169 sdata_info(sdata, "%pM denied association (code=%d)\n",
3170 mgmt->sa, status_code);
3171 ieee80211_destroy_assoc_data(sdata, false);
3172 event.u.mlme.status = MLME_DENIED;
3173 event.u.mlme.reason = status_code;
3174 drv_event_callback(sdata->local, sdata, &event);
3175 } else {
3176 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
3177 /* oops -- internal error -- send timeout for now */
3178 ieee80211_destroy_assoc_data(sdata, false);
3179 cfg80211_assoc_timeout(sdata->dev, bss);
3180 return;
3181 }
3182 event.u.mlme.status = MLME_SUCCESS;
3183 drv_event_callback(sdata->local, sdata, &event);
3184 sdata_info(sdata, "associated\n");
3185
3186 /*
3187 * destroy assoc_data afterwards, as otherwise an idle
3188 * recalc after assoc_data is NULL but before associated
3189 * is set can cause the interface to go idle
3190 */
3191 ieee80211_destroy_assoc_data(sdata, true);
3192
3193 /* get uapsd queues configuration */
3194 uapsd_queues = 0;
3195 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
3196 if (sdata->tx_conf[ac].uapsd)
3197 uapsd_queues |= BIT(ac);
3198 }
3199
3200 cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
3201 }
3202
3203 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
3204 struct ieee80211_mgmt *mgmt, size_t len,
3205 struct ieee80211_rx_status *rx_status,
3206 struct ieee802_11_elems *elems)
3207 {
3208 struct ieee80211_local *local = sdata->local;
3209 struct ieee80211_bss *bss;
3210 struct ieee80211_channel *channel;
3211
3212 sdata_assert_lock(sdata);
3213
3214 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
3215 if (!channel)
3216 return;
3217
3218 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3219 channel);
3220 if (bss) {
3221 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3222 ieee80211_rx_bss_put(local, bss);
3223 }
3224 }
3225
3226
3227 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
3228 struct sk_buff *skb)
3229 {
3230 struct ieee80211_mgmt *mgmt = (void *)skb->data;
3231 struct ieee80211_if_managed *ifmgd;
3232 struct ieee80211_rx_status *rx_status = (void *) skb->cb;
3233 size_t baselen, len = skb->len;
3234 struct ieee802_11_elems elems;
3235
3236 ifmgd = &sdata->u.mgd;
3237
3238 sdata_assert_lock(sdata);
3239
3240 if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3241 return; /* ignore ProbeResp to foreign address */
3242
3243 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
3244 if (baselen > len)
3245 return;
3246
3247 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3248 false, &elems);
3249
3250 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3251
3252 if (ifmgd->associated &&
3253 ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3254 ieee80211_reset_ap_probe(sdata);
3255 }
3256
3257 /*
3258 * This is the canonical list of information elements we care about,
3259 * the filter code also gives us all changes to the Microsoft OUI
3260 * (00:50:F2) vendor IE which is used for WMM which we need to track,
3261 * as well as the DTPC IE (part of the Cisco OUI) used for signaling
3262 * changes to requested client power.
3263 *
3264 * We implement beacon filtering in software since that means we can
3265 * avoid processing the frame here and in cfg80211, and userspace
3266 * will not be able to tell whether the hardware supports it or not.
3267 *
3268 * XXX: This list needs to be dynamic -- userspace needs to be able to
3269 * add items it requires. It also needs to be able to tell us to
3270 * look out for other vendor IEs.
3271 */
3272 static const u64 care_about_ies =
3273 (1ULL << WLAN_EID_COUNTRY) |
3274 (1ULL << WLAN_EID_ERP_INFO) |
3275 (1ULL << WLAN_EID_CHANNEL_SWITCH) |
3276 (1ULL << WLAN_EID_PWR_CONSTRAINT) |
3277 (1ULL << WLAN_EID_HT_CAPABILITY) |
3278 (1ULL << WLAN_EID_HT_OPERATION) |
3279 (1ULL << WLAN_EID_EXT_CHANSWITCH_ANN);
3280
3281 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
3282 struct ieee80211_mgmt *mgmt, size_t len,
3283 struct ieee80211_rx_status *rx_status)
3284 {
3285 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3286 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3287 size_t baselen;
3288 struct ieee802_11_elems elems;
3289 struct ieee80211_local *local = sdata->local;
3290 struct ieee80211_chanctx_conf *chanctx_conf;
3291 struct ieee80211_channel *chan;
3292 struct sta_info *sta;
3293 u32 changed = 0;
3294 bool erp_valid;
3295 u8 erp_value = 0;
3296 u32 ncrc;
3297 u8 *bssid;
3298 u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3299
3300 sdata_assert_lock(sdata);
3301
3302 /* Process beacon from the current BSS */
3303 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
3304 if (baselen > len)
3305 return;
3306
3307 rcu_read_lock();
3308 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3309 if (!chanctx_conf) {
3310 rcu_read_unlock();
3311 return;
3312 }
3313
3314 if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
3315 rcu_read_unlock();
3316 return;
3317 }
3318 chan = chanctx_conf->def.chan;
3319 rcu_read_unlock();
3320
3321 if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3322 ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
3323 ieee802_11_parse_elems(mgmt->u.beacon.variable,
3324 len - baselen, false, &elems);
3325
3326 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3327 if (elems.tim && !elems.parse_error) {
3328 const struct ieee80211_tim_ie *tim_ie = elems.tim;
3329 ifmgd->dtim_period = tim_ie->dtim_period;
3330 }
3331 ifmgd->have_beacon = true;
3332 ifmgd->assoc_data->need_beacon = false;
3333 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3334 sdata->vif.bss_conf.sync_tsf =
3335 le64_to_cpu(mgmt->u.beacon.timestamp);
3336 sdata->vif.bss_conf.sync_device_ts =
3337 rx_status->device_timestamp;
3338 if (elems.tim)
3339 sdata->vif.bss_conf.sync_dtim_count =
3340 elems.tim->dtim_count;
3341 else
3342 sdata->vif.bss_conf.sync_dtim_count = 0;
3343 }
3344 /* continue assoc process */
3345 ifmgd->assoc_data->timeout = jiffies;
3346 ifmgd->assoc_data->timeout_started = true;
3347 run_again(sdata, ifmgd->assoc_data->timeout);
3348 return;
3349 }
3350
3351 if (!ifmgd->associated ||
3352 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3353 return;
3354 bssid = ifmgd->associated->bssid;
3355
3356 /* Track average RSSI from the Beacon frames of the current AP */
3357 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
3358 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3359 ewma_beacon_signal_init(&ifmgd->ave_beacon_signal);
3360 ifmgd->last_cqm_event_signal = 0;
3361 ifmgd->count_beacon_signal = 1;
3362 ifmgd->last_ave_beacon_signal = 0;
3363 } else {
3364 ifmgd->count_beacon_signal++;
3365 }
3366
3367 ewma_beacon_signal_add(&ifmgd->ave_beacon_signal, -rx_status->signal);
3368
3369 if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3370 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3371 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3372 int last_sig = ifmgd->last_ave_beacon_signal;
3373 struct ieee80211_event event = {
3374 .type = RSSI_EVENT,
3375 };
3376
3377 /*
3378 * if signal crosses either of the boundaries, invoke callback
3379 * with appropriate parameters
3380 */
3381 if (sig > ifmgd->rssi_max_thold &&
3382 (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3383 ifmgd->last_ave_beacon_signal = sig;
3384 event.u.rssi.data = RSSI_EVENT_HIGH;
3385 drv_event_callback(local, sdata, &event);
3386 } else if (sig < ifmgd->rssi_min_thold &&
3387 (last_sig >= ifmgd->rssi_max_thold ||
3388 last_sig == 0)) {
3389 ifmgd->last_ave_beacon_signal = sig;
3390 event.u.rssi.data = RSSI_EVENT_LOW;
3391 drv_event_callback(local, sdata, &event);
3392 }
3393 }
3394
3395 if (bss_conf->cqm_rssi_thold &&
3396 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3397 !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3398 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3399 int last_event = ifmgd->last_cqm_event_signal;
3400 int thold = bss_conf->cqm_rssi_thold;
3401 int hyst = bss_conf->cqm_rssi_hyst;
3402
3403 if (sig < thold &&
3404 (last_event == 0 || sig < last_event - hyst)) {
3405 ifmgd->last_cqm_event_signal = sig;
3406 ieee80211_cqm_rssi_notify(
3407 &sdata->vif,
3408 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3409 GFP_KERNEL);
3410 } else if (sig > thold &&
3411 (last_event == 0 || sig > last_event + hyst)) {
3412 ifmgd->last_cqm_event_signal = sig;
3413 ieee80211_cqm_rssi_notify(
3414 &sdata->vif,
3415 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3416 GFP_KERNEL);
3417 }
3418 }
3419
3420 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3421 mlme_dbg_ratelimited(sdata,
3422 "cancelling AP probe due to a received beacon\n");
3423 ieee80211_reset_ap_probe(sdata);
3424 }
3425
3426 /*
3427 * Push the beacon loss detection into the future since
3428 * we are processing a beacon from the AP just now.
3429 */
3430 ieee80211_sta_reset_beacon_monitor(sdata);
3431
3432 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3433 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3434 len - baselen, false, &elems,
3435 care_about_ies, ncrc);
3436
3437 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
3438 ieee80211_check_tim(elems.tim, elems.tim_len, ifmgd->aid)) {
3439 if (local->hw.conf.dynamic_ps_timeout > 0) {
3440 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3441 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3442 ieee80211_hw_config(local,
3443 IEEE80211_CONF_CHANGE_PS);
3444 }
3445 ieee80211_send_nullfunc(local, sdata, false);
3446 } else if (!local->pspolling && sdata->u.mgd.powersave) {
3447 local->pspolling = true;
3448
3449 /*
3450 * Here is assumed that the driver will be
3451 * able to send ps-poll frame and receive a
3452 * response even though power save mode is
3453 * enabled, but some drivers might require
3454 * to disable power save here. This needs
3455 * to be investigated.
3456 */
3457 ieee80211_send_pspoll(local, sdata);
3458 }
3459 }
3460
3461 if (sdata->vif.p2p) {
3462 struct ieee80211_p2p_noa_attr noa = {};
3463 int ret;
3464
3465 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3466 len - baselen,
3467 IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3468 (u8 *) &noa, sizeof(noa));
3469 if (ret >= 2) {
3470 if (sdata->u.mgd.p2p_noa_index != noa.index) {
3471 /* valid noa_attr and index changed */
3472 sdata->u.mgd.p2p_noa_index = noa.index;
3473 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3474 changed |= BSS_CHANGED_P2P_PS;
3475 /*
3476 * make sure we update all information, the CRC
3477 * mechanism doesn't look at P2P attributes.
3478 */
3479 ifmgd->beacon_crc_valid = false;
3480 }
3481 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3482 /* noa_attr not found and we had valid noa_attr before */
3483 sdata->u.mgd.p2p_noa_index = -1;
3484 memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3485 changed |= BSS_CHANGED_P2P_PS;
3486 ifmgd->beacon_crc_valid = false;
3487 }
3488 }
3489
3490 if (ifmgd->csa_waiting_bcn)
3491 ieee80211_chswitch_post_beacon(sdata);
3492
3493 /*
3494 * Update beacon timing and dtim count on every beacon appearance. This
3495 * will allow the driver to use the most updated values. Do it before
3496 * comparing this one with last received beacon.
3497 * IMPORTANT: These parameters would possibly be out of sync by the time
3498 * the driver will use them. The synchronized view is currently
3499 * guaranteed only in certain callbacks.
3500 */
3501 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3502 sdata->vif.bss_conf.sync_tsf =
3503 le64_to_cpu(mgmt->u.beacon.timestamp);
3504 sdata->vif.bss_conf.sync_device_ts =
3505 rx_status->device_timestamp;
3506 if (elems.tim)
3507 sdata->vif.bss_conf.sync_dtim_count =
3508 elems.tim->dtim_count;
3509 else
3510 sdata->vif.bss_conf.sync_dtim_count = 0;
3511 }
3512
3513 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3514 return;
3515 ifmgd->beacon_crc = ncrc;
3516 ifmgd->beacon_crc_valid = true;
3517
3518 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3519
3520 ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3521 rx_status->device_timestamp,
3522 &elems, true);
3523
3524 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3525 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3526 elems.wmm_param_len))
3527 changed |= BSS_CHANGED_QOS;
3528
3529 /*
3530 * If we haven't had a beacon before, tell the driver about the
3531 * DTIM period (and beacon timing if desired) now.
3532 */
3533 if (!ifmgd->have_beacon) {
3534 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3535 if (elems.tim)
3536 bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3537 else
3538 bss_conf->dtim_period = 1;
3539
3540 changed |= BSS_CHANGED_BEACON_INFO;
3541 ifmgd->have_beacon = true;
3542
3543 mutex_lock(&local->iflist_mtx);
3544 ieee80211_recalc_ps(local);
3545 mutex_unlock(&local->iflist_mtx);
3546
3547 ieee80211_recalc_ps_vif(sdata);
3548 }
3549
3550 if (elems.erp_info) {
3551 erp_valid = true;
3552 erp_value = elems.erp_info[0];
3553 } else {
3554 erp_valid = false;
3555 }
3556 changed |= ieee80211_handle_bss_capability(sdata,
3557 le16_to_cpu(mgmt->u.beacon.capab_info),
3558 erp_valid, erp_value);
3559
3560 mutex_lock(&local->sta_mtx);
3561 sta = sta_info_get(sdata, bssid);
3562
3563 if (ieee80211_config_bw(sdata, sta,
3564 elems.ht_cap_elem, elems.ht_operation,
3565 elems.vht_operation, bssid, &changed)) {
3566 mutex_unlock(&local->sta_mtx);
3567 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3568 WLAN_REASON_DEAUTH_LEAVING,
3569 true, deauth_buf);
3570 ieee80211_report_disconnect(sdata, deauth_buf,
3571 sizeof(deauth_buf), true,
3572 WLAN_REASON_DEAUTH_LEAVING);
3573 return;
3574 }
3575
3576 if (sta && elems.opmode_notif)
3577 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3578 rx_status->band, true);
3579 mutex_unlock(&local->sta_mtx);
3580
3581 changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
3582 elems.country_elem,
3583 elems.country_elem_len,
3584 elems.pwr_constr_elem,
3585 elems.cisco_dtpc_elem);
3586
3587 ieee80211_bss_info_change_notify(sdata, changed);
3588 }
3589
3590 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3591 struct sk_buff *skb)
3592 {
3593 struct ieee80211_rx_status *rx_status;
3594 struct ieee80211_mgmt *mgmt;
3595 u16 fc;
3596 struct ieee802_11_elems elems;
3597 int ies_len;
3598
3599 rx_status = (struct ieee80211_rx_status *) skb->cb;
3600 mgmt = (struct ieee80211_mgmt *) skb->data;
3601 fc = le16_to_cpu(mgmt->frame_control);
3602
3603 sdata_lock(sdata);
3604
3605 switch (fc & IEEE80211_FCTL_STYPE) {
3606 case IEEE80211_STYPE_BEACON:
3607 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3608 break;
3609 case IEEE80211_STYPE_PROBE_RESP:
3610 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3611 break;
3612 case IEEE80211_STYPE_AUTH:
3613 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3614 break;
3615 case IEEE80211_STYPE_DEAUTH:
3616 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3617 break;
3618 case IEEE80211_STYPE_DISASSOC:
3619 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3620 break;
3621 case IEEE80211_STYPE_ASSOC_RESP:
3622 case IEEE80211_STYPE_REASSOC_RESP:
3623 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3624 break;
3625 case IEEE80211_STYPE_ACTION:
3626 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3627 ies_len = skb->len -
3628 offsetof(struct ieee80211_mgmt,
3629 u.action.u.chan_switch.variable);
3630
3631 if (ies_len < 0)
3632 break;
3633
3634 ieee802_11_parse_elems(
3635 mgmt->u.action.u.chan_switch.variable,
3636 ies_len, true, &elems);
3637
3638 if (elems.parse_error)
3639 break;
3640
3641 ieee80211_sta_process_chanswitch(sdata,
3642 rx_status->mactime,
3643 rx_status->device_timestamp,
3644 &elems, false);
3645 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3646 ies_len = skb->len -
3647 offsetof(struct ieee80211_mgmt,
3648 u.action.u.ext_chan_switch.variable);
3649
3650 if (ies_len < 0)
3651 break;
3652
3653 ieee802_11_parse_elems(
3654 mgmt->u.action.u.ext_chan_switch.variable,
3655 ies_len, true, &elems);
3656
3657 if (elems.parse_error)
3658 break;
3659
3660 /* for the handling code pretend this was also an IE */
3661 elems.ext_chansw_ie =
3662 &mgmt->u.action.u.ext_chan_switch.data;
3663
3664 ieee80211_sta_process_chanswitch(sdata,
3665 rx_status->mactime,
3666 rx_status->device_timestamp,
3667 &elems, false);
3668 }
3669 break;
3670 }
3671 sdata_unlock(sdata);
3672 }
3673
3674 static void ieee80211_sta_timer(unsigned long data)
3675 {
3676 struct ieee80211_sub_if_data *sdata =
3677 (struct ieee80211_sub_if_data *) data;
3678
3679 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3680 }
3681
3682 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3683 u8 *bssid, u8 reason, bool tx)
3684 {
3685 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3686
3687 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3688 tx, frame_buf);
3689
3690 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
3691 reason);
3692 }
3693
3694 static int ieee80211_auth(struct ieee80211_sub_if_data *sdata)
3695 {
3696 struct ieee80211_local *local = sdata->local;
3697 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3698 struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3699 u32 tx_flags = 0;
3700 u16 trans = 1;
3701 u16 status = 0;
3702
3703 sdata_assert_lock(sdata);
3704
3705 if (WARN_ON_ONCE(!auth_data))
3706 return -EINVAL;
3707
3708 auth_data->tries++;
3709
3710 if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3711 sdata_info(sdata, "authentication with %pM timed out\n",
3712 auth_data->bss->bssid);
3713
3714 /*
3715 * Most likely AP is not in the range so remove the
3716 * bss struct for that AP.
3717 */
3718 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3719
3720 return -ETIMEDOUT;
3721 }
3722
3723 drv_mgd_prepare_tx(local, sdata);
3724
3725 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3726 auth_data->bss->bssid, auth_data->tries,
3727 IEEE80211_AUTH_MAX_TRIES);
3728
3729 auth_data->expected_transaction = 2;
3730
3731 if (auth_data->algorithm == WLAN_AUTH_SAE) {
3732 trans = auth_data->sae_trans;
3733 status = auth_data->sae_status;
3734 auth_data->expected_transaction = trans;
3735 }
3736
3737 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3738 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3739 IEEE80211_TX_INTFL_MLME_CONN_TX;
3740
3741 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3742 auth_data->data, auth_data->data_len,
3743 auth_data->bss->bssid,
3744 auth_data->bss->bssid, NULL, 0, 0,
3745 tx_flags);
3746
3747 if (tx_flags == 0) {
3748 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3749 auth_data->timeout_started = true;
3750 run_again(sdata, auth_data->timeout);
3751 } else {
3752 auth_data->timeout =
3753 round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3754 auth_data->timeout_started = true;
3755 run_again(sdata, auth_data->timeout);
3756 }
3757
3758 return 0;
3759 }
3760
3761 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3762 {
3763 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3764 struct ieee80211_local *local = sdata->local;
3765
3766 sdata_assert_lock(sdata);
3767
3768 assoc_data->tries++;
3769 if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3770 sdata_info(sdata, "association with %pM timed out\n",
3771 assoc_data->bss->bssid);
3772
3773 /*
3774 * Most likely AP is not in the range so remove the
3775 * bss struct for that AP.
3776 */
3777 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3778
3779 return -ETIMEDOUT;
3780 }
3781
3782 sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3783 assoc_data->bss->bssid, assoc_data->tries,
3784 IEEE80211_ASSOC_MAX_TRIES);
3785 ieee80211_send_assoc(sdata);
3786
3787 if (!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3788 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3789 assoc_data->timeout_started = true;
3790 run_again(sdata, assoc_data->timeout);
3791 } else {
3792 assoc_data->timeout =
3793 round_jiffies_up(jiffies +
3794 IEEE80211_ASSOC_TIMEOUT_LONG);
3795 assoc_data->timeout_started = true;
3796 run_again(sdata, assoc_data->timeout);
3797 }
3798
3799 return 0;
3800 }
3801
3802 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3803 __le16 fc, bool acked)
3804 {
3805 struct ieee80211_local *local = sdata->local;
3806
3807 sdata->u.mgd.status_fc = fc;
3808 sdata->u.mgd.status_acked = acked;
3809 sdata->u.mgd.status_received = true;
3810
3811 ieee80211_queue_work(&local->hw, &sdata->work);
3812 }
3813
3814 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3815 {
3816 struct ieee80211_local *local = sdata->local;
3817 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3818
3819 sdata_lock(sdata);
3820
3821 if (ifmgd->status_received) {
3822 __le16 fc = ifmgd->status_fc;
3823 bool status_acked = ifmgd->status_acked;
3824
3825 ifmgd->status_received = false;
3826 if (ifmgd->auth_data && ieee80211_is_auth(fc)) {
3827 if (status_acked) {
3828 ifmgd->auth_data->timeout =
3829 jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3830 run_again(sdata, ifmgd->auth_data->timeout);
3831 } else {
3832 ifmgd->auth_data->timeout = jiffies - 1;
3833 }
3834 ifmgd->auth_data->timeout_started = true;
3835 } else if (ifmgd->assoc_data &&
3836 (ieee80211_is_assoc_req(fc) ||
3837 ieee80211_is_reassoc_req(fc))) {
3838 if (status_acked) {
3839 ifmgd->assoc_data->timeout =
3840 jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3841 run_again(sdata, ifmgd->assoc_data->timeout);
3842 } else {
3843 ifmgd->assoc_data->timeout = jiffies - 1;
3844 }
3845 ifmgd->assoc_data->timeout_started = true;
3846 }
3847 }
3848
3849 if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3850 time_after(jiffies, ifmgd->auth_data->timeout)) {
3851 if (ifmgd->auth_data->done) {
3852 /*
3853 * ok ... we waited for assoc but userspace didn't,
3854 * so let's just kill the auth data
3855 */
3856 ieee80211_destroy_auth_data(sdata, false);
3857 } else if (ieee80211_auth(sdata)) {
3858 u8 bssid[ETH_ALEN];
3859 struct ieee80211_event event = {
3860 .type = MLME_EVENT,
3861 .u.mlme.data = AUTH_EVENT,
3862 .u.mlme.status = MLME_TIMEOUT,
3863 };
3864
3865 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3866
3867 ieee80211_destroy_auth_data(sdata, false);
3868
3869 cfg80211_auth_timeout(sdata->dev, bssid);
3870 drv_event_callback(sdata->local, sdata, &event);
3871 }
3872 } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3873 run_again(sdata, ifmgd->auth_data->timeout);
3874
3875 if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3876 time_after(jiffies, ifmgd->assoc_data->timeout)) {
3877 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3878 ieee80211_do_assoc(sdata)) {
3879 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3880 struct ieee80211_event event = {
3881 .type = MLME_EVENT,
3882 .u.mlme.data = ASSOC_EVENT,
3883 .u.mlme.status = MLME_TIMEOUT,
3884 };
3885
3886 ieee80211_destroy_assoc_data(sdata, false);
3887 cfg80211_assoc_timeout(sdata->dev, bss);
3888 drv_event_callback(sdata->local, sdata, &event);
3889 }
3890 } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3891 run_again(sdata, ifmgd->assoc_data->timeout);
3892
3893 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3894 ifmgd->associated) {
3895 u8 bssid[ETH_ALEN];
3896 int max_tries;
3897
3898 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3899
3900 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3901 max_tries = max_nullfunc_tries;
3902 else
3903 max_tries = max_probe_tries;
3904
3905 /* ACK received for nullfunc probing frame */
3906 if (!ifmgd->probe_send_count)
3907 ieee80211_reset_ap_probe(sdata);
3908 else if (ifmgd->nullfunc_failed) {
3909 if (ifmgd->probe_send_count < max_tries) {
3910 mlme_dbg(sdata,
3911 "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3912 bssid, ifmgd->probe_send_count,
3913 max_tries);
3914 ieee80211_mgd_probe_ap_send(sdata);
3915 } else {
3916 mlme_dbg(sdata,
3917 "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3918 bssid);
3919 ieee80211_sta_connection_lost(sdata, bssid,
3920 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3921 false);
3922 }
3923 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3924 run_again(sdata, ifmgd->probe_timeout);
3925 else if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3926 mlme_dbg(sdata,
3927 "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3928 bssid, probe_wait_ms);
3929 ieee80211_sta_connection_lost(sdata, bssid,
3930 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3931 } else if (ifmgd->probe_send_count < max_tries) {
3932 mlme_dbg(sdata,
3933 "No probe response from AP %pM after %dms, try %d/%i\n",
3934 bssid, probe_wait_ms,
3935 ifmgd->probe_send_count, max_tries);
3936 ieee80211_mgd_probe_ap_send(sdata);
3937 } else {
3938 /*
3939 * We actually lost the connection ... or did we?
3940 * Let's make sure!
3941 */
3942 wiphy_debug(local->hw.wiphy,
3943 "%s: No probe response from AP %pM"
3944 " after %dms, disconnecting.\n",
3945 sdata->name,
3946 bssid, probe_wait_ms);
3947
3948 ieee80211_sta_connection_lost(sdata, bssid,
3949 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3950 }
3951 }
3952
3953 sdata_unlock(sdata);
3954 }
3955
3956 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3957 {
3958 struct ieee80211_sub_if_data *sdata =
3959 (struct ieee80211_sub_if_data *) data;
3960 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3961
3962 if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3963 return;
3964
3965 sdata->u.mgd.connection_loss = false;
3966 ieee80211_queue_work(&sdata->local->hw,
3967 &sdata->u.mgd.beacon_connection_loss_work);
3968 }
3969
3970 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3971 {
3972 struct ieee80211_sub_if_data *sdata =
3973 (struct ieee80211_sub_if_data *) data;
3974 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3975 struct ieee80211_local *local = sdata->local;
3976
3977 if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3978 return;
3979
3980 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3981 }
3982
3983 static void ieee80211_sta_monitor_work(struct work_struct *work)
3984 {
3985 struct ieee80211_sub_if_data *sdata =
3986 container_of(work, struct ieee80211_sub_if_data,
3987 u.mgd.monitor_work);
3988
3989 ieee80211_mgd_probe_ap(sdata, false);
3990 }
3991
3992 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3993 {
3994 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3995 __ieee80211_stop_poll(sdata);
3996
3997 /* let's probe the connection once */
3998 if (!ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
3999 ieee80211_queue_work(&sdata->local->hw,
4000 &sdata->u.mgd.monitor_work);
4001 /* and do all the other regular work too */
4002 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
4003 }
4004 }
4005
4006 #ifdef CONFIG_PM
4007 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
4008 {
4009 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4010 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4011
4012 sdata_lock(sdata);
4013
4014 if (ifmgd->auth_data || ifmgd->assoc_data) {
4015 const u8 *bssid = ifmgd->auth_data ?
4016 ifmgd->auth_data->bss->bssid :
4017 ifmgd->assoc_data->bss->bssid;
4018
4019 /*
4020 * If we are trying to authenticate / associate while suspending,
4021 * cfg80211 won't know and won't actually abort those attempts,
4022 * thus we need to do that ourselves.
4023 */
4024 ieee80211_send_deauth_disassoc(sdata, bssid,
4025 IEEE80211_STYPE_DEAUTH,
4026 WLAN_REASON_DEAUTH_LEAVING,
4027 false, frame_buf);
4028 if (ifmgd->assoc_data)
4029 ieee80211_destroy_assoc_data(sdata, false);
4030 if (ifmgd->auth_data)
4031 ieee80211_destroy_auth_data(sdata, false);
4032 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4033 IEEE80211_DEAUTH_FRAME_LEN);
4034 }
4035
4036 /* This is a bit of a hack - we should find a better and more generic
4037 * solution to this. Normally when suspending, cfg80211 will in fact
4038 * deauthenticate. However, it doesn't (and cannot) stop an ongoing
4039 * auth (not so important) or assoc (this is the problem) process.
4040 *
4041 * As a consequence, it can happen that we are in the process of both
4042 * associating and suspending, and receive an association response
4043 * after cfg80211 has checked if it needs to disconnect, but before
4044 * we actually set the flag to drop incoming frames. This will then
4045 * cause the workqueue flush to process the association response in
4046 * the suspend, resulting in a successful association just before it
4047 * tries to remove the interface from the driver, which now though
4048 * has a channel context assigned ... this results in issues.
4049 *
4050 * To work around this (for now) simply deauth here again if we're
4051 * now connected.
4052 */
4053 if (ifmgd->associated && !sdata->local->wowlan) {
4054 u8 bssid[ETH_ALEN];
4055 struct cfg80211_deauth_request req = {
4056 .reason_code = WLAN_REASON_DEAUTH_LEAVING,
4057 .bssid = bssid,
4058 };
4059
4060 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
4061 ieee80211_mgd_deauth(sdata, &req);
4062 }
4063
4064 sdata_unlock(sdata);
4065 }
4066
4067 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
4068 {
4069 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4070
4071 sdata_lock(sdata);
4072 if (!ifmgd->associated) {
4073 sdata_unlock(sdata);
4074 return;
4075 }
4076
4077 if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
4078 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
4079 mlme_dbg(sdata, "driver requested disconnect after resume\n");
4080 ieee80211_sta_connection_lost(sdata,
4081 ifmgd->associated->bssid,
4082 WLAN_REASON_UNSPECIFIED,
4083 true);
4084 sdata_unlock(sdata);
4085 return;
4086 }
4087 sdata_unlock(sdata);
4088 }
4089 #endif
4090
4091 /* interface setup */
4092 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
4093 {
4094 struct ieee80211_if_managed *ifmgd;
4095
4096 ifmgd = &sdata->u.mgd;
4097 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
4098 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
4099 INIT_WORK(&ifmgd->beacon_connection_loss_work,
4100 ieee80211_beacon_connection_loss_work);
4101 INIT_WORK(&ifmgd->csa_connection_drop_work,
4102 ieee80211_csa_connection_drop_work);
4103 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
4104 INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
4105 ieee80211_tdls_peer_del_work);
4106 setup_timer(&ifmgd->timer, ieee80211_sta_timer,
4107 (unsigned long) sdata);
4108 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
4109 (unsigned long) sdata);
4110 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
4111 (unsigned long) sdata);
4112 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
4113 (unsigned long) sdata);
4114 INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
4115 ieee80211_sta_handle_tspec_ac_params_wk);
4116
4117 ifmgd->flags = 0;
4118 ifmgd->powersave = sdata->wdev.ps;
4119 ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
4120 ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
4121 ifmgd->p2p_noa_index = -1;
4122
4123 if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4124 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
4125 else
4126 ifmgd->req_smps = IEEE80211_SMPS_OFF;
4127
4128 /* Setup TDLS data */
4129 spin_lock_init(&ifmgd->teardown_lock);
4130 ifmgd->teardown_skb = NULL;
4131 ifmgd->orig_teardown_skb = NULL;
4132 }
4133
4134 /* scan finished notification */
4135 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
4136 {
4137 struct ieee80211_sub_if_data *sdata;
4138
4139 /* Restart STA timers */
4140 rcu_read_lock();
4141 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4142 if (ieee80211_sdata_running(sdata))
4143 ieee80211_restart_sta_timer(sdata);
4144 }
4145 rcu_read_unlock();
4146 }
4147
4148 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
4149 struct cfg80211_bss *cbss)
4150 {
4151 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4152 const u8 *ht_cap_ie, *vht_cap_ie;
4153 const struct ieee80211_ht_cap *ht_cap;
4154 const struct ieee80211_vht_cap *vht_cap;
4155 u8 chains = 1;
4156
4157 if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
4158 return chains;
4159
4160 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4161 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
4162 ht_cap = (void *)(ht_cap_ie + 2);
4163 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
4164 /*
4165 * TODO: use "Tx Maximum Number Spatial Streams Supported" and
4166 * "Tx Unequal Modulation Supported" fields.
4167 */
4168 }
4169
4170 if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
4171 return chains;
4172
4173 vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4174 if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
4175 u8 nss;
4176 u16 tx_mcs_map;
4177
4178 vht_cap = (void *)(vht_cap_ie + 2);
4179 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
4180 for (nss = 8; nss > 0; nss--) {
4181 if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
4182 IEEE80211_VHT_MCS_NOT_SUPPORTED)
4183 break;
4184 }
4185 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
4186 chains = max(chains, nss);
4187 }
4188
4189 return chains;
4190 }
4191
4192 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
4193 struct cfg80211_bss *cbss)
4194 {
4195 struct ieee80211_local *local = sdata->local;
4196 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4197 const struct ieee80211_ht_cap *ht_cap = NULL;
4198 const struct ieee80211_ht_operation *ht_oper = NULL;
4199 const struct ieee80211_vht_operation *vht_oper = NULL;
4200 struct ieee80211_supported_band *sband;
4201 struct cfg80211_chan_def chandef;
4202 int ret;
4203 u32 i;
4204 bool have_80mhz;
4205
4206 sband = local->hw.wiphy->bands[cbss->channel->band];
4207
4208 ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
4209 IEEE80211_STA_DISABLE_80P80MHZ |
4210 IEEE80211_STA_DISABLE_160MHZ);
4211
4212 rcu_read_lock();
4213
4214 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
4215 sband->ht_cap.ht_supported) {
4216 const u8 *ht_oper_ie, *ht_cap_ie;
4217
4218 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4219 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
4220 ht_oper = (void *)(ht_oper_ie + 2);
4221
4222 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4223 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
4224 ht_cap = (void *)(ht_cap_ie + 2);
4225
4226 if (!ht_cap) {
4227 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4228 ht_oper = NULL;
4229 }
4230 }
4231
4232 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4233 sband->vht_cap.vht_supported) {
4234 const u8 *vht_oper_ie, *vht_cap;
4235
4236 vht_oper_ie = ieee80211_bss_get_ie(cbss,
4237 WLAN_EID_VHT_OPERATION);
4238 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
4239 vht_oper = (void *)(vht_oper_ie + 2);
4240 if (vht_oper && !ht_oper) {
4241 vht_oper = NULL;
4242 sdata_info(sdata,
4243 "AP advertised VHT without HT, disabling both\n");
4244 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4245 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4246 }
4247
4248 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4249 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
4250 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4251 vht_oper = NULL;
4252 }
4253 }
4254
4255 /* Allow VHT if at least one channel on the sband supports 80 MHz */
4256 have_80mhz = false;
4257 for (i = 0; i < sband->n_channels; i++) {
4258 if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
4259 IEEE80211_CHAN_NO_80MHZ))
4260 continue;
4261
4262 have_80mhz = true;
4263 break;
4264 }
4265
4266 if (!have_80mhz)
4267 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4268
4269 ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
4270 cbss->channel,
4271 ht_cap, ht_oper, vht_oper,
4272 &chandef, false);
4273
4274 sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
4275 local->rx_chains);
4276
4277 rcu_read_unlock();
4278
4279 /* will change later if needed */
4280 sdata->smps_mode = IEEE80211_SMPS_OFF;
4281
4282 mutex_lock(&local->mtx);
4283 /*
4284 * If this fails (possibly due to channel context sharing
4285 * on incompatible channels, e.g. 80+80 and 160 sharing the
4286 * same control channel) try to use a smaller bandwidth.
4287 */
4288 ret = ieee80211_vif_use_channel(sdata, &chandef,
4289 IEEE80211_CHANCTX_SHARED);
4290
4291 /* don't downgrade for 5 and 10 MHz channels, though. */
4292 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
4293 chandef.width == NL80211_CHAN_WIDTH_10)
4294 goto out;
4295
4296 while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4297 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4298 ret = ieee80211_vif_use_channel(sdata, &chandef,
4299 IEEE80211_CHANCTX_SHARED);
4300 }
4301 out:
4302 mutex_unlock(&local->mtx);
4303 return ret;
4304 }
4305
4306 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4307 struct cfg80211_bss *cbss, bool assoc,
4308 bool override)
4309 {
4310 struct ieee80211_local *local = sdata->local;
4311 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4312 struct ieee80211_bss *bss = (void *)cbss->priv;
4313 struct sta_info *new_sta = NULL;
4314 struct ieee80211_supported_band *sband;
4315 bool have_sta = false;
4316 int err;
4317
4318 sband = local->hw.wiphy->bands[cbss->channel->band];
4319
4320 if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
4321 return -EINVAL;
4322
4323 if (assoc) {
4324 rcu_read_lock();
4325 have_sta = sta_info_get(sdata, cbss->bssid);
4326 rcu_read_unlock();
4327 }
4328
4329 if (!have_sta) {
4330 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
4331 if (!new_sta)
4332 return -ENOMEM;
4333 }
4334
4335 if (new_sta || override) {
4336 err = ieee80211_prep_channel(sdata, cbss);
4337 if (err) {
4338 if (new_sta)
4339 sta_info_free(local, new_sta);
4340 return -EINVAL;
4341 }
4342 }
4343
4344 if (new_sta) {
4345 u32 rates = 0, basic_rates = 0;
4346 bool have_higher_than_11mbit;
4347 int min_rate = INT_MAX, min_rate_index = -1;
4348 struct ieee80211_chanctx_conf *chanctx_conf;
4349 const struct cfg80211_bss_ies *ies;
4350 int shift = ieee80211_vif_get_shift(&sdata->vif);
4351 u32 rate_flags;
4352
4353 rcu_read_lock();
4354 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4355 if (WARN_ON(!chanctx_conf)) {
4356 rcu_read_unlock();
4357 sta_info_free(local, new_sta);
4358 return -EINVAL;
4359 }
4360 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
4361 rcu_read_unlock();
4362
4363 ieee80211_get_rates(sband, bss->supp_rates,
4364 bss->supp_rates_len,
4365 &rates, &basic_rates,
4366 &have_higher_than_11mbit,
4367 &min_rate, &min_rate_index,
4368 shift, rate_flags);
4369
4370 /*
4371 * This used to be a workaround for basic rates missing
4372 * in the association response frame. Now that we no
4373 * longer use the basic rates from there, it probably
4374 * doesn't happen any more, but keep the workaround so
4375 * in case some *other* APs are buggy in different ways
4376 * we can connect -- with a warning.
4377 */
4378 if (!basic_rates && min_rate_index >= 0) {
4379 sdata_info(sdata,
4380 "No basic rates, using min rate instead\n");
4381 basic_rates = BIT(min_rate_index);
4382 }
4383
4384 new_sta->sta.supp_rates[cbss->channel->band] = rates;
4385 sdata->vif.bss_conf.basic_rates = basic_rates;
4386
4387 /* cf. IEEE 802.11 9.2.12 */
4388 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
4389 have_higher_than_11mbit)
4390 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
4391 else
4392 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
4393
4394 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
4395
4396 /* set timing information */
4397 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
4398 rcu_read_lock();
4399 ies = rcu_dereference(cbss->beacon_ies);
4400 if (ies) {
4401 const u8 *tim_ie;
4402
4403 sdata->vif.bss_conf.sync_tsf = ies->tsf;
4404 sdata->vif.bss_conf.sync_device_ts =
4405 bss->device_ts_beacon;
4406 tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4407 ies->data, ies->len);
4408 if (tim_ie && tim_ie[1] >= 2)
4409 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
4410 else
4411 sdata->vif.bss_conf.sync_dtim_count = 0;
4412 } else if (!ieee80211_hw_check(&sdata->local->hw,
4413 TIMING_BEACON_ONLY)) {
4414 ies = rcu_dereference(cbss->proberesp_ies);
4415 /* must be non-NULL since beacon IEs were NULL */
4416 sdata->vif.bss_conf.sync_tsf = ies->tsf;
4417 sdata->vif.bss_conf.sync_device_ts =
4418 bss->device_ts_presp;
4419 sdata->vif.bss_conf.sync_dtim_count = 0;
4420 } else {
4421 sdata->vif.bss_conf.sync_tsf = 0;
4422 sdata->vif.bss_conf.sync_device_ts = 0;
4423 sdata->vif.bss_conf.sync_dtim_count = 0;
4424 }
4425 rcu_read_unlock();
4426
4427 /* tell driver about BSSID, basic rates and timing */
4428 ieee80211_bss_info_change_notify(sdata,
4429 BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4430 BSS_CHANGED_BEACON_INT);
4431
4432 if (assoc)
4433 sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4434
4435 err = sta_info_insert(new_sta);
4436 new_sta = NULL;
4437 if (err) {
4438 sdata_info(sdata,
4439 "failed to insert STA entry for the AP (error %d)\n",
4440 err);
4441 return err;
4442 }
4443 } else
4444 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4445
4446 /* Cancel scan to ensure that nothing interferes with connection */
4447 if (local->scanning)
4448 ieee80211_scan_cancel(local);
4449
4450 return 0;
4451 }
4452
4453 /* config hooks */
4454 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4455 struct cfg80211_auth_request *req)
4456 {
4457 struct ieee80211_local *local = sdata->local;
4458 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4459 struct ieee80211_mgd_auth_data *auth_data;
4460 u16 auth_alg;
4461 int err;
4462
4463 /* prepare auth data structure */
4464
4465 switch (req->auth_type) {
4466 case NL80211_AUTHTYPE_OPEN_SYSTEM:
4467 auth_alg = WLAN_AUTH_OPEN;
4468 break;
4469 case NL80211_AUTHTYPE_SHARED_KEY:
4470 if (IS_ERR(local->wep_tx_tfm))
4471 return -EOPNOTSUPP;
4472 auth_alg = WLAN_AUTH_SHARED_KEY;
4473 break;
4474 case NL80211_AUTHTYPE_FT:
4475 auth_alg = WLAN_AUTH_FT;
4476 break;
4477 case NL80211_AUTHTYPE_NETWORK_EAP:
4478 auth_alg = WLAN_AUTH_LEAP;
4479 break;
4480 case NL80211_AUTHTYPE_SAE:
4481 auth_alg = WLAN_AUTH_SAE;
4482 break;
4483 default:
4484 return -EOPNOTSUPP;
4485 }
4486
4487 auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
4488 req->ie_len, GFP_KERNEL);
4489 if (!auth_data)
4490 return -ENOMEM;
4491
4492 auth_data->bss = req->bss;
4493
4494 if (req->sae_data_len >= 4) {
4495 __le16 *pos = (__le16 *) req->sae_data;
4496 auth_data->sae_trans = le16_to_cpu(pos[0]);
4497 auth_data->sae_status = le16_to_cpu(pos[1]);
4498 memcpy(auth_data->data, req->sae_data + 4,
4499 req->sae_data_len - 4);
4500 auth_data->data_len += req->sae_data_len - 4;
4501 }
4502
4503 if (req->ie && req->ie_len) {
4504 memcpy(&auth_data->data[auth_data->data_len],
4505 req->ie, req->ie_len);
4506 auth_data->data_len += req->ie_len;
4507 }
4508
4509 if (req->key && req->key_len) {
4510 auth_data->key_len = req->key_len;
4511 auth_data->key_idx = req->key_idx;
4512 memcpy(auth_data->key, req->key, req->key_len);
4513 }
4514
4515 auth_data->algorithm = auth_alg;
4516
4517 /* try to authenticate/probe */
4518
4519 if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4520 ifmgd->assoc_data) {
4521 err = -EBUSY;
4522 goto err_free;
4523 }
4524
4525 if (ifmgd->auth_data)
4526 ieee80211_destroy_auth_data(sdata, false);
4527
4528 /* prep auth_data so we don't go into idle on disassoc */
4529 ifmgd->auth_data = auth_data;
4530
4531 if (ifmgd->associated) {
4532 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4533
4534 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4535 WLAN_REASON_UNSPECIFIED,
4536 false, frame_buf);
4537
4538 ieee80211_report_disconnect(sdata, frame_buf,
4539 sizeof(frame_buf), true,
4540 WLAN_REASON_UNSPECIFIED);
4541 }
4542
4543 sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4544
4545 err = ieee80211_prep_connection(sdata, req->bss, false, false);
4546 if (err)
4547 goto err_clear;
4548
4549 err = ieee80211_auth(sdata);
4550 if (err) {
4551 sta_info_destroy_addr(sdata, req->bss->bssid);
4552 goto err_clear;
4553 }
4554
4555 /* hold our own reference */
4556 cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4557 return 0;
4558
4559 err_clear:
4560 eth_zero_addr(ifmgd->bssid);
4561 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4562 ifmgd->auth_data = NULL;
4563 mutex_lock(&sdata->local->mtx);
4564 ieee80211_vif_release_channel(sdata);
4565 mutex_unlock(&sdata->local->mtx);
4566 err_free:
4567 kfree(auth_data);
4568 return err;
4569 }
4570
4571 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4572 struct cfg80211_assoc_request *req)
4573 {
4574 struct ieee80211_local *local = sdata->local;
4575 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4576 struct ieee80211_bss *bss = (void *)req->bss->priv;
4577 struct ieee80211_mgd_assoc_data *assoc_data;
4578 const struct cfg80211_bss_ies *beacon_ies;
4579 struct ieee80211_supported_band *sband;
4580 const u8 *ssidie, *ht_ie, *vht_ie;
4581 int i, err;
4582 bool override = false;
4583
4584 assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4585 if (!assoc_data)
4586 return -ENOMEM;
4587
4588 rcu_read_lock();
4589 ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4590 if (!ssidie) {
4591 rcu_read_unlock();
4592 kfree(assoc_data);
4593 return -EINVAL;
4594 }
4595 memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4596 assoc_data->ssid_len = ssidie[1];
4597 rcu_read_unlock();
4598
4599 if (ifmgd->associated) {
4600 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4601
4602 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4603 WLAN_REASON_UNSPECIFIED,
4604 false, frame_buf);
4605
4606 ieee80211_report_disconnect(sdata, frame_buf,
4607 sizeof(frame_buf), true,
4608 WLAN_REASON_UNSPECIFIED);
4609 }
4610
4611 if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4612 err = -EBUSY;
4613 goto err_free;
4614 }
4615
4616 if (ifmgd->assoc_data) {
4617 err = -EBUSY;
4618 goto err_free;
4619 }
4620
4621 if (ifmgd->auth_data) {
4622 bool match;
4623
4624 /* keep sta info, bssid if matching */
4625 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4626 ieee80211_destroy_auth_data(sdata, match);
4627 }
4628
4629 /* prepare assoc data */
4630
4631 ifmgd->beacon_crc_valid = false;
4632
4633 assoc_data->wmm = bss->wmm_used &&
4634 (local->hw.queues >= IEEE80211_NUM_ACS);
4635
4636 /*
4637 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4638 * We still associate in non-HT mode (11a/b/g) if any one of these
4639 * ciphers is configured as pairwise.
4640 * We can set this to true for non-11n hardware, that'll be checked
4641 * separately along with the peer capabilities.
4642 */
4643 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4644 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4645 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4646 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4647 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4648 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4649 netdev_info(sdata->dev,
4650 "disabling HT/VHT due to WEP/TKIP use\n");
4651 }
4652 }
4653
4654 /* Also disable HT if we don't support it or the AP doesn't use WMM */
4655 sband = local->hw.wiphy->bands[req->bss->channel->band];
4656 if (!sband->ht_cap.ht_supported ||
4657 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4658 ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4659 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4660 if (!bss->wmm_used &&
4661 !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4662 netdev_info(sdata->dev,
4663 "disabling HT as WMM/QoS is not supported by the AP\n");
4664 }
4665
4666 /* disable VHT if we don't support it or the AP doesn't use WMM */
4667 if (!sband->vht_cap.vht_supported ||
4668 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4669 ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4670 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4671 if (!bss->wmm_used &&
4672 !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4673 netdev_info(sdata->dev,
4674 "disabling VHT as WMM/QoS is not supported by the AP\n");
4675 }
4676
4677 memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4678 memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4679 sizeof(ifmgd->ht_capa_mask));
4680
4681 memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4682 memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4683 sizeof(ifmgd->vht_capa_mask));
4684
4685 if (req->ie && req->ie_len) {
4686 memcpy(assoc_data->ie, req->ie, req->ie_len);
4687 assoc_data->ie_len = req->ie_len;
4688 }
4689
4690 assoc_data->bss = req->bss;
4691
4692 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4693 if (ifmgd->powersave)
4694 sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4695 else
4696 sdata->smps_mode = IEEE80211_SMPS_OFF;
4697 } else
4698 sdata->smps_mode = ifmgd->req_smps;
4699
4700 assoc_data->capability = req->bss->capability;
4701 assoc_data->supp_rates = bss->supp_rates;
4702 assoc_data->supp_rates_len = bss->supp_rates_len;
4703
4704 rcu_read_lock();
4705 ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4706 if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4707 assoc_data->ap_ht_param =
4708 ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4709 else
4710 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4711 vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4712 if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4713 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4714 sizeof(struct ieee80211_vht_cap));
4715 else
4716 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4717 rcu_read_unlock();
4718
4719 if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) &&
4720 ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK),
4721 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"))
4722 sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;
4723
4724 if (bss->wmm_used && bss->uapsd_supported &&
4725 (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) {
4726 assoc_data->uapsd = true;
4727 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4728 } else {
4729 assoc_data->uapsd = false;
4730 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4731 }
4732
4733 if (req->prev_bssid)
4734 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4735
4736 if (req->use_mfp) {
4737 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4738 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4739 } else {
4740 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4741 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4742 }
4743
4744 if (req->flags & ASSOC_REQ_USE_RRM)
4745 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
4746 else
4747 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;
4748
4749 if (req->crypto.control_port)
4750 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4751 else
4752 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4753
4754 sdata->control_port_protocol = req->crypto.control_port_ethertype;
4755 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4756 sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4757 sdata->vif.type);
4758
4759 /* kick off associate process */
4760
4761 ifmgd->assoc_data = assoc_data;
4762 ifmgd->dtim_period = 0;
4763 ifmgd->have_beacon = false;
4764
4765 /* override HT/VHT configuration only if the AP and we support it */
4766 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
4767 struct ieee80211_sta_ht_cap sta_ht_cap;
4768
4769 if (req->flags & ASSOC_REQ_DISABLE_HT)
4770 override = true;
4771
4772 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
4773 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
4774
4775 /* check for 40 MHz disable override */
4776 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ) &&
4777 sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
4778 !(sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
4779 override = true;
4780
4781 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4782 req->flags & ASSOC_REQ_DISABLE_VHT)
4783 override = true;
4784 }
4785
4786 if (req->flags & ASSOC_REQ_DISABLE_HT) {
4787 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4788 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4789 }
4790
4791 if (req->flags & ASSOC_REQ_DISABLE_VHT)
4792 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4793
4794 err = ieee80211_prep_connection(sdata, req->bss, true, override);
4795 if (err)
4796 goto err_clear;
4797
4798 rcu_read_lock();
4799 beacon_ies = rcu_dereference(req->bss->beacon_ies);
4800
4801 if (ieee80211_hw_check(&sdata->local->hw, NEED_DTIM_BEFORE_ASSOC) &&
4802 !beacon_ies) {
4803 /*
4804 * Wait up to one beacon interval ...
4805 * should this be more if we miss one?
4806 */
4807 sdata_info(sdata, "waiting for beacon from %pM\n",
4808 ifmgd->bssid);
4809 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4810 assoc_data->timeout_started = true;
4811 assoc_data->need_beacon = true;
4812 } else if (beacon_ies) {
4813 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4814 beacon_ies->data,
4815 beacon_ies->len);
4816 u8 dtim_count = 0;
4817
4818 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4819 const struct ieee80211_tim_ie *tim;
4820 tim = (void *)(tim_ie + 2);
4821 ifmgd->dtim_period = tim->dtim_period;
4822 dtim_count = tim->dtim_count;
4823 }
4824 ifmgd->have_beacon = true;
4825 assoc_data->timeout = jiffies;
4826 assoc_data->timeout_started = true;
4827
4828 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
4829 sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4830 sdata->vif.bss_conf.sync_device_ts =
4831 bss->device_ts_beacon;
4832 sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4833 }
4834 } else {
4835 assoc_data->timeout = jiffies;
4836 assoc_data->timeout_started = true;
4837 }
4838 rcu_read_unlock();
4839
4840 run_again(sdata, assoc_data->timeout);
4841
4842 if (bss->corrupt_data) {
4843 char *corrupt_type = "data";
4844 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4845 if (bss->corrupt_data &
4846 IEEE80211_BSS_CORRUPT_PROBE_RESP)
4847 corrupt_type = "beacon and probe response";
4848 else
4849 corrupt_type = "beacon";
4850 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4851 corrupt_type = "probe response";
4852 sdata_info(sdata, "associating with AP with corrupt %s\n",
4853 corrupt_type);
4854 }
4855
4856 return 0;
4857 err_clear:
4858 eth_zero_addr(ifmgd->bssid);
4859 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4860 ifmgd->assoc_data = NULL;
4861 err_free:
4862 kfree(assoc_data);
4863 return err;
4864 }
4865
4866 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4867 struct cfg80211_deauth_request *req)
4868 {
4869 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4870 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4871 bool tx = !req->local_state_change;
4872
4873 if (ifmgd->auth_data &&
4874 ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
4875 sdata_info(sdata,
4876 "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
4877 req->bssid, req->reason_code,
4878 ieee80211_get_reason_code_string(req->reason_code));
4879
4880 drv_mgd_prepare_tx(sdata->local, sdata);
4881 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4882 IEEE80211_STYPE_DEAUTH,
4883 req->reason_code, tx,
4884 frame_buf);
4885 ieee80211_destroy_auth_data(sdata, false);
4886 ieee80211_report_disconnect(sdata, frame_buf,
4887 sizeof(frame_buf), true,
4888 req->reason_code);
4889
4890 return 0;
4891 }
4892
4893 if (ifmgd->assoc_data &&
4894 ether_addr_equal(ifmgd->assoc_data->bss->bssid, req->bssid)) {
4895 sdata_info(sdata,
4896 "aborting association with %pM by local choice (Reason: %u=%s)\n",
4897 req->bssid, req->reason_code,
4898 ieee80211_get_reason_code_string(req->reason_code));
4899
4900 drv_mgd_prepare_tx(sdata->local, sdata);
4901 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4902 IEEE80211_STYPE_DEAUTH,
4903 req->reason_code, tx,
4904 frame_buf);
4905 ieee80211_destroy_assoc_data(sdata, false);
4906 ieee80211_report_disconnect(sdata, frame_buf,
4907 sizeof(frame_buf), true,
4908 req->reason_code);
4909 return 0;
4910 }
4911
4912 if (ifmgd->associated &&
4913 ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4914 sdata_info(sdata,
4915 "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
4916 req->bssid, req->reason_code,
4917 ieee80211_get_reason_code_string(req->reason_code));
4918
4919 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4920 req->reason_code, tx, frame_buf);
4921 ieee80211_report_disconnect(sdata, frame_buf,
4922 sizeof(frame_buf), true,
4923 req->reason_code);
4924 return 0;
4925 }
4926
4927 return -ENOTCONN;
4928 }
4929
4930 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4931 struct cfg80211_disassoc_request *req)
4932 {
4933 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4934 u8 bssid[ETH_ALEN];
4935 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4936
4937 /*
4938 * cfg80211 should catch this ... but it's racy since
4939 * we can receive a disassoc frame, process it, hand it
4940 * to cfg80211 while that's in a locked section already
4941 * trying to tell us that the user wants to disconnect.
4942 */
4943 if (ifmgd->associated != req->bss)
4944 return -ENOLINK;
4945
4946 sdata_info(sdata,
4947 "disassociating from %pM by local choice (Reason: %u=%s)\n",
4948 req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
4949
4950 memcpy(bssid, req->bss->bssid, ETH_ALEN);
4951 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
4952 req->reason_code, !req->local_state_change,
4953 frame_buf);
4954
4955 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
4956 req->reason_code);
4957
4958 return 0;
4959 }
4960
4961 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4962 {
4963 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4964
4965 /*
4966 * Make sure some work items will not run after this,
4967 * they will not do anything but might not have been
4968 * cancelled when disconnecting.
4969 */
4970 cancel_work_sync(&ifmgd->monitor_work);
4971 cancel_work_sync(&ifmgd->beacon_connection_loss_work);
4972 cancel_work_sync(&ifmgd->request_smps_work);
4973 cancel_work_sync(&ifmgd->csa_connection_drop_work);
4974 cancel_work_sync(&ifmgd->chswitch_work);
4975 cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
4976
4977 sdata_lock(sdata);
4978 if (ifmgd->assoc_data) {
4979 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
4980 ieee80211_destroy_assoc_data(sdata, false);
4981 cfg80211_assoc_timeout(sdata->dev, bss);
4982 }
4983 if (ifmgd->auth_data)
4984 ieee80211_destroy_auth_data(sdata, false);
4985 spin_lock_bh(&ifmgd->teardown_lock);
4986 if (ifmgd->teardown_skb) {
4987 kfree_skb(ifmgd->teardown_skb);
4988 ifmgd->teardown_skb = NULL;
4989 ifmgd->orig_teardown_skb = NULL;
4990 }
4991 spin_unlock_bh(&ifmgd->teardown_lock);
4992 del_timer_sync(&ifmgd->timer);
4993 sdata_unlock(sdata);
4994 }
4995
4996 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
4997 enum nl80211_cqm_rssi_threshold_event rssi_event,
4998 gfp_t gfp)
4999 {
5000 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5001
5002 trace_api_cqm_rssi_notify(sdata, rssi_event);
5003
5004 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
5005 }
5006 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
5007
5008 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp)
5009 {
5010 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5011
5012 trace_api_cqm_beacon_loss_notify(sdata->local, sdata);
5013
5014 cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp);
5015 }
5016 EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify);
Linux kernel - Deliverables
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