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Merge tag 'mac80211-next-for-davem-2015-10-05' of git://git.kernel.org/pub/scm/linux...
[mirror_ubuntu-zesty-kernel.git] / net / mac80211 / mlme.c
1 /*
2 * BSS client mode implementation
3 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4 * Copyright 2004, Instant802 Networks, Inc.
5 * Copyright 2005, Devicescape Software, Inc.
6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8 * Copyright 2013-2014 Intel Mobile Communications GmbH
9 * Copyright (C) 2015 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/pm_qos.h>
24 #include <linux/crc32.h>
25 #include <linux/slab.h>
26 #include <linux/export.h>
27 #include <net/mac80211.h>
28 #include <asm/unaligned.h>
29
30 #include "ieee80211_i.h"
31 #include "driver-ops.h"
32 #include "rate.h"
33 #include "led.h"
34
35 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
36 #define IEEE80211_AUTH_TIMEOUT_LONG (HZ / 2)
37 #define IEEE80211_AUTH_TIMEOUT_SHORT (HZ / 10)
38 #define IEEE80211_AUTH_MAX_TRIES 3
39 #define IEEE80211_AUTH_WAIT_ASSOC (HZ * 5)
40 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
41 #define IEEE80211_ASSOC_TIMEOUT_LONG (HZ / 2)
42 #define IEEE80211_ASSOC_TIMEOUT_SHORT (HZ / 10)
43 #define IEEE80211_ASSOC_MAX_TRIES 3
44
45 static int max_nullfunc_tries = 2;
46 module_param(max_nullfunc_tries, int, 0644);
47 MODULE_PARM_DESC(max_nullfunc_tries,
48 "Maximum nullfunc tx tries before disconnecting (reason 4).");
49
50 static int max_probe_tries = 5;
51 module_param(max_probe_tries, int, 0644);
52 MODULE_PARM_DESC(max_probe_tries,
53 "Maximum probe tries before disconnecting (reason 4).");
54
55 /*
56 * Beacon loss timeout is calculated as N frames times the
57 * advertised beacon interval. This may need to be somewhat
58 * higher than what hardware might detect to account for
59 * delays in the host processing frames. But since we also
60 * probe on beacon miss before declaring the connection lost
61 * default to what we want.
62 */
63 static int beacon_loss_count = 7;
64 module_param(beacon_loss_count, int, 0644);
65 MODULE_PARM_DESC(beacon_loss_count,
66 "Number of beacon intervals before we decide beacon was lost.");
67
68 /*
69 * Time the connection can be idle before we probe
70 * it to see if we can still talk to the AP.
71 */
72 #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ)
73 /*
74 * Time we wait for a probe response after sending
75 * a probe request because of beacon loss or for
76 * checking the connection still works.
77 */
78 static int probe_wait_ms = 500;
79 module_param(probe_wait_ms, int, 0644);
80 MODULE_PARM_DESC(probe_wait_ms,
81 "Maximum time(ms) to wait for probe response"
82 " before disconnecting (reason 4).");
83
84 /*
85 * How many Beacon frames need to have been used in average signal strength
86 * before starting to indicate signal change events.
87 */
88 #define IEEE80211_SIGNAL_AVE_MIN_COUNT 4
89
90 /*
91 * We can have multiple work items (and connection probing)
92 * scheduling this timer, but we need to take care to only
93 * reschedule it when it should fire _earlier_ than it was
94 * asked for before, or if it's not pending right now. This
95 * function ensures that. Note that it then is required to
96 * run this function for all timeouts after the first one
97 * has happened -- the work that runs from this timer will
98 * do that.
99 */
100 static void run_again(struct ieee80211_sub_if_data *sdata,
101 unsigned long timeout)
102 {
103 sdata_assert_lock(sdata);
104
105 if (!timer_pending(&sdata->u.mgd.timer) ||
106 time_before(timeout, sdata->u.mgd.timer.expires))
107 mod_timer(&sdata->u.mgd.timer, timeout);
108 }
109
110 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
111 {
112 if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
113 return;
114
115 if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
116 return;
117
118 mod_timer(&sdata->u.mgd.bcn_mon_timer,
119 round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
120 }
121
122 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
123 {
124 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
125
126 if (unlikely(!sdata->u.mgd.associated))
127 return;
128
129 ifmgd->probe_send_count = 0;
130
131 if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
132 return;
133
134 mod_timer(&sdata->u.mgd.conn_mon_timer,
135 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
136 }
137
138 static int ecw2cw(int ecw)
139 {
140 return (1 << ecw) - 1;
141 }
142
143 static u32
144 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
145 struct ieee80211_supported_band *sband,
146 struct ieee80211_channel *channel,
147 const struct ieee80211_ht_cap *ht_cap,
148 const struct ieee80211_ht_operation *ht_oper,
149 const struct ieee80211_vht_operation *vht_oper,
150 struct cfg80211_chan_def *chandef, bool tracking)
151 {
152 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
153 struct cfg80211_chan_def vht_chandef;
154 struct ieee80211_sta_ht_cap sta_ht_cap;
155 u32 ht_cfreq, ret;
156
157 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
158 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
159
160 chandef->chan = channel;
161 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
162 chandef->center_freq1 = channel->center_freq;
163 chandef->center_freq2 = 0;
164
165 if (!ht_cap || !ht_oper || !sta_ht_cap.ht_supported) {
166 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
167 goto out;
168 }
169
170 chandef->width = NL80211_CHAN_WIDTH_20;
171
172 if (!(ht_cap->cap_info &
173 cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40))) {
174 ret = IEEE80211_STA_DISABLE_40MHZ;
175 vht_chandef = *chandef;
176 goto out;
177 }
178
179 ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
180 channel->band);
181 /* check that channel matches the right operating channel */
182 if (!tracking && channel->center_freq != ht_cfreq) {
183 /*
184 * It's possible that some APs are confused here;
185 * Netgear WNDR3700 sometimes reports 4 higher than
186 * the actual channel in association responses, but
187 * since we look at probe response/beacon data here
188 * it should be OK.
189 */
190 sdata_info(sdata,
191 "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
192 channel->center_freq, ht_cfreq,
193 ht_oper->primary_chan, channel->band);
194 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
195 goto out;
196 }
197
198 /* check 40 MHz support, if we have it */
199 if (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
200 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
201 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
202 chandef->width = NL80211_CHAN_WIDTH_40;
203 chandef->center_freq1 += 10;
204 break;
205 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
206 chandef->width = NL80211_CHAN_WIDTH_40;
207 chandef->center_freq1 -= 10;
208 break;
209 }
210 } else {
211 /* 40 MHz (and 80 MHz) must be supported for VHT */
212 ret = IEEE80211_STA_DISABLE_VHT;
213 /* also mark 40 MHz disabled */
214 ret |= IEEE80211_STA_DISABLE_40MHZ;
215 goto out;
216 }
217
218 if (!vht_oper || !sband->vht_cap.vht_supported) {
219 ret = IEEE80211_STA_DISABLE_VHT;
220 goto out;
221 }
222
223 vht_chandef.chan = channel;
224 vht_chandef.center_freq1 =
225 ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx,
226 channel->band);
227 vht_chandef.center_freq2 = 0;
228
229 switch (vht_oper->chan_width) {
230 case IEEE80211_VHT_CHANWIDTH_USE_HT:
231 vht_chandef.width = chandef->width;
232 vht_chandef.center_freq1 = chandef->center_freq1;
233 break;
234 case IEEE80211_VHT_CHANWIDTH_80MHZ:
235 vht_chandef.width = NL80211_CHAN_WIDTH_80;
236 break;
237 case IEEE80211_VHT_CHANWIDTH_160MHZ:
238 vht_chandef.width = NL80211_CHAN_WIDTH_160;
239 break;
240 case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
241 vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
242 vht_chandef.center_freq2 =
243 ieee80211_channel_to_frequency(
244 vht_oper->center_freq_seg2_idx,
245 channel->band);
246 break;
247 default:
248 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
249 sdata_info(sdata,
250 "AP VHT operation IE has invalid channel width (%d), disable VHT\n",
251 vht_oper->chan_width);
252 ret = IEEE80211_STA_DISABLE_VHT;
253 goto out;
254 }
255
256 if (!cfg80211_chandef_valid(&vht_chandef)) {
257 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
258 sdata_info(sdata,
259 "AP VHT information is invalid, disable VHT\n");
260 ret = IEEE80211_STA_DISABLE_VHT;
261 goto out;
262 }
263
264 if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
265 ret = 0;
266 goto out;
267 }
268
269 if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
270 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
271 sdata_info(sdata,
272 "AP VHT information doesn't match HT, disable VHT\n");
273 ret = IEEE80211_STA_DISABLE_VHT;
274 goto out;
275 }
276
277 *chandef = vht_chandef;
278
279 ret = 0;
280
281 out:
282 /*
283 * When tracking the current AP, don't do any further checks if the
284 * new chandef is identical to the one we're currently using for the
285 * connection. This keeps us from playing ping-pong with regulatory,
286 * without it the following can happen (for example):
287 * - connect to an AP with 80 MHz, world regdom allows 80 MHz
288 * - AP advertises regdom US
289 * - CRDA loads regdom US with 80 MHz prohibited (old database)
290 * - the code below detects an unsupported channel, downgrades, and
291 * we disconnect from the AP in the caller
292 * - disconnect causes CRDA to reload world regdomain and the game
293 * starts anew.
294 * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
295 *
296 * It seems possible that there are still scenarios with CSA or real
297 * bandwidth changes where a this could happen, but those cases are
298 * less common and wouldn't completely prevent using the AP.
299 */
300 if (tracking &&
301 cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
302 return ret;
303
304 /* don't print the message below for VHT mismatch if VHT is disabled */
305 if (ret & IEEE80211_STA_DISABLE_VHT)
306 vht_chandef = *chandef;
307
308 /*
309 * Ignore the DISABLED flag when we're already connected and only
310 * tracking the APs beacon for bandwidth changes - otherwise we
311 * might get disconnected here if we connect to an AP, update our
312 * regulatory information based on the AP's country IE and the
313 * information we have is wrong/outdated and disables the channel
314 * that we're actually using for the connection to the AP.
315 */
316 while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
317 tracking ? 0 :
318 IEEE80211_CHAN_DISABLED)) {
319 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
320 ret = IEEE80211_STA_DISABLE_HT |
321 IEEE80211_STA_DISABLE_VHT;
322 break;
323 }
324
325 ret |= ieee80211_chandef_downgrade(chandef);
326 }
327
328 if (chandef->width != vht_chandef.width && !tracking)
329 sdata_info(sdata,
330 "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
331
332 WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
333 return ret;
334 }
335
336 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
337 struct sta_info *sta,
338 const struct ieee80211_ht_cap *ht_cap,
339 const struct ieee80211_ht_operation *ht_oper,
340 const struct ieee80211_vht_operation *vht_oper,
341 const u8 *bssid, u32 *changed)
342 {
343 struct ieee80211_local *local = sdata->local;
344 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
345 struct ieee80211_supported_band *sband;
346 struct ieee80211_channel *chan;
347 struct cfg80211_chan_def chandef;
348 u16 ht_opmode;
349 u32 flags;
350 enum ieee80211_sta_rx_bandwidth new_sta_bw;
351 int ret;
352
353 /* if HT was/is disabled, don't track any bandwidth changes */
354 if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
355 return 0;
356
357 /* don't check VHT if we associated as non-VHT station */
358 if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
359 vht_oper = NULL;
360
361 if (WARN_ON_ONCE(!sta))
362 return -EINVAL;
363
364 /*
365 * if bss configuration changed store the new one -
366 * this may be applicable even if channel is identical
367 */
368 ht_opmode = le16_to_cpu(ht_oper->operation_mode);
369 if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
370 *changed |= BSS_CHANGED_HT;
371 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
372 }
373
374 chan = sdata->vif.bss_conf.chandef.chan;
375 sband = local->hw.wiphy->bands[chan->band];
376
377 /* calculate new channel (type) based on HT/VHT operation IEs */
378 flags = ieee80211_determine_chantype(sdata, sband, chan,
379 ht_cap, ht_oper, vht_oper,
380 &chandef, true);
381
382 /*
383 * Downgrade the new channel if we associated with restricted
384 * capabilities. For example, if we associated as a 20 MHz STA
385 * to a 40 MHz AP (due to regulatory, capabilities or config
386 * reasons) then switching to a 40 MHz channel now won't do us
387 * any good -- we couldn't use it with the AP.
388 */
389 if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
390 chandef.width == NL80211_CHAN_WIDTH_80P80)
391 flags |= ieee80211_chandef_downgrade(&chandef);
392 if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
393 chandef.width == NL80211_CHAN_WIDTH_160)
394 flags |= ieee80211_chandef_downgrade(&chandef);
395 if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
396 chandef.width > NL80211_CHAN_WIDTH_20)
397 flags |= ieee80211_chandef_downgrade(&chandef);
398
399 if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
400 return 0;
401
402 sdata_info(sdata,
403 "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
404 ifmgd->bssid, chandef.chan->center_freq, chandef.width,
405 chandef.center_freq1, chandef.center_freq2);
406
407 if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
408 IEEE80211_STA_DISABLE_VHT |
409 IEEE80211_STA_DISABLE_40MHZ |
410 IEEE80211_STA_DISABLE_80P80MHZ |
411 IEEE80211_STA_DISABLE_160MHZ)) ||
412 !cfg80211_chandef_valid(&chandef)) {
413 sdata_info(sdata,
414 "AP %pM changed bandwidth in a way we can't support - disconnect\n",
415 ifmgd->bssid);
416 return -EINVAL;
417 }
418
419 switch (chandef.width) {
420 case NL80211_CHAN_WIDTH_20_NOHT:
421 case NL80211_CHAN_WIDTH_20:
422 new_sta_bw = IEEE80211_STA_RX_BW_20;
423 break;
424 case NL80211_CHAN_WIDTH_40:
425 new_sta_bw = IEEE80211_STA_RX_BW_40;
426 break;
427 case NL80211_CHAN_WIDTH_80:
428 new_sta_bw = IEEE80211_STA_RX_BW_80;
429 break;
430 case NL80211_CHAN_WIDTH_80P80:
431 case NL80211_CHAN_WIDTH_160:
432 new_sta_bw = IEEE80211_STA_RX_BW_160;
433 break;
434 default:
435 return -EINVAL;
436 }
437
438 if (new_sta_bw > sta->cur_max_bandwidth)
439 new_sta_bw = sta->cur_max_bandwidth;
440
441 if (new_sta_bw < sta->sta.bandwidth) {
442 sta->sta.bandwidth = new_sta_bw;
443 rate_control_rate_update(local, sband, sta,
444 IEEE80211_RC_BW_CHANGED);
445 }
446
447 ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
448 if (ret) {
449 sdata_info(sdata,
450 "AP %pM changed bandwidth to incompatible one - disconnect\n",
451 ifmgd->bssid);
452 return ret;
453 }
454
455 if (new_sta_bw > sta->sta.bandwidth) {
456 sta->sta.bandwidth = new_sta_bw;
457 rate_control_rate_update(local, sband, sta,
458 IEEE80211_RC_BW_CHANGED);
459 }
460
461 return 0;
462 }
463
464 /* frame sending functions */
465
466 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
467 struct sk_buff *skb, u8 ap_ht_param,
468 struct ieee80211_supported_band *sband,
469 struct ieee80211_channel *channel,
470 enum ieee80211_smps_mode smps)
471 {
472 u8 *pos;
473 u32 flags = channel->flags;
474 u16 cap;
475 struct ieee80211_sta_ht_cap ht_cap;
476
477 BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
478
479 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
480 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
481
482 /* determine capability flags */
483 cap = ht_cap.cap;
484
485 switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
486 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
487 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
488 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
489 cap &= ~IEEE80211_HT_CAP_SGI_40;
490 }
491 break;
492 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
493 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
494 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
495 cap &= ~IEEE80211_HT_CAP_SGI_40;
496 }
497 break;
498 }
499
500 /*
501 * If 40 MHz was disabled associate as though we weren't
502 * capable of 40 MHz -- some broken APs will never fall
503 * back to trying to transmit in 20 MHz.
504 */
505 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
506 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
507 cap &= ~IEEE80211_HT_CAP_SGI_40;
508 }
509
510 /* set SM PS mode properly */
511 cap &= ~IEEE80211_HT_CAP_SM_PS;
512 switch (smps) {
513 case IEEE80211_SMPS_AUTOMATIC:
514 case IEEE80211_SMPS_NUM_MODES:
515 WARN_ON(1);
516 case IEEE80211_SMPS_OFF:
517 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
518 IEEE80211_HT_CAP_SM_PS_SHIFT;
519 break;
520 case IEEE80211_SMPS_STATIC:
521 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
522 IEEE80211_HT_CAP_SM_PS_SHIFT;
523 break;
524 case IEEE80211_SMPS_DYNAMIC:
525 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
526 IEEE80211_HT_CAP_SM_PS_SHIFT;
527 break;
528 }
529
530 /* reserve and fill IE */
531 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
532 ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
533 }
534
535 /* This function determines vht capability flags for the association
536 * and builds the IE.
537 * Note - the function may set the owner of the MU-MIMO capability
538 */
539 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
540 struct sk_buff *skb,
541 struct ieee80211_supported_band *sband,
542 struct ieee80211_vht_cap *ap_vht_cap)
543 {
544 struct ieee80211_local *local = sdata->local;
545 u8 *pos;
546 u32 cap;
547 struct ieee80211_sta_vht_cap vht_cap;
548 u32 mask, ap_bf_sts, our_bf_sts;
549
550 BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
551
552 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
553 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
554
555 /* determine capability flags */
556 cap = vht_cap.cap;
557
558 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
559 u32 bw = cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
560
561 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
562 if (bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ ||
563 bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
564 cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
565 }
566
567 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
568 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
569 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
570 }
571
572 /*
573 * Some APs apparently get confused if our capabilities are better
574 * than theirs, so restrict what we advertise in the assoc request.
575 */
576 if (!(ap_vht_cap->vht_cap_info &
577 cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
578 cap &= ~(IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
579 IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE);
580 else if (!(ap_vht_cap->vht_cap_info &
581 cpu_to_le32(IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE)))
582 cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
583
584 /*
585 * If some other vif is using the MU-MIMO capablity we cannot associate
586 * using MU-MIMO - this will lead to contradictions in the group-id
587 * mechanism.
588 * Ownership is defined since association request, in order to avoid
589 * simultaneous associations with MU-MIMO.
590 */
591 if (cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE) {
592 bool disable_mu_mimo = false;
593 struct ieee80211_sub_if_data *other;
594
595 list_for_each_entry_rcu(other, &local->interfaces, list) {
596 if (other->flags & IEEE80211_SDATA_MU_MIMO_OWNER) {
597 disable_mu_mimo = true;
598 break;
599 }
600 }
601 if (disable_mu_mimo)
602 cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
603 else
604 sdata->flags |= IEEE80211_SDATA_MU_MIMO_OWNER;
605 }
606
607 mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
608
609 ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask;
610 our_bf_sts = cap & mask;
611
612 if (ap_bf_sts < our_bf_sts) {
613 cap &= ~mask;
614 cap |= ap_bf_sts;
615 }
616
617 /* reserve and fill IE */
618 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
619 ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
620 }
621
622 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
623 {
624 struct ieee80211_local *local = sdata->local;
625 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
626 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
627 struct sk_buff *skb;
628 struct ieee80211_mgmt *mgmt;
629 u8 *pos, qos_info;
630 size_t offset = 0, noffset;
631 int i, count, rates_len, supp_rates_len, shift;
632 u16 capab;
633 struct ieee80211_supported_band *sband;
634 struct ieee80211_chanctx_conf *chanctx_conf;
635 struct ieee80211_channel *chan;
636 u32 rate_flags, rates = 0;
637
638 sdata_assert_lock(sdata);
639
640 rcu_read_lock();
641 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
642 if (WARN_ON(!chanctx_conf)) {
643 rcu_read_unlock();
644 return;
645 }
646 chan = chanctx_conf->def.chan;
647 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
648 rcu_read_unlock();
649 sband = local->hw.wiphy->bands[chan->band];
650 shift = ieee80211_vif_get_shift(&sdata->vif);
651
652 if (assoc_data->supp_rates_len) {
653 /*
654 * Get all rates supported by the device and the AP as
655 * some APs don't like getting a superset of their rates
656 * in the association request (e.g. D-Link DAP 1353 in
657 * b-only mode)...
658 */
659 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
660 assoc_data->supp_rates,
661 assoc_data->supp_rates_len,
662 &rates);
663 } else {
664 /*
665 * In case AP not provide any supported rates information
666 * before association, we send information element(s) with
667 * all rates that we support.
668 */
669 rates_len = 0;
670 for (i = 0; i < sband->n_bitrates; i++) {
671 if ((rate_flags & sband->bitrates[i].flags)
672 != rate_flags)
673 continue;
674 rates |= BIT(i);
675 rates_len++;
676 }
677 }
678
679 skb = alloc_skb(local->hw.extra_tx_headroom +
680 sizeof(*mgmt) + /* bit too much but doesn't matter */
681 2 + assoc_data->ssid_len + /* SSID */
682 4 + rates_len + /* (extended) rates */
683 4 + /* power capability */
684 2 + 2 * sband->n_channels + /* supported channels */
685 2 + sizeof(struct ieee80211_ht_cap) + /* HT */
686 2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
687 assoc_data->ie_len + /* extra IEs */
688 9, /* WMM */
689 GFP_KERNEL);
690 if (!skb)
691 return;
692
693 skb_reserve(skb, local->hw.extra_tx_headroom);
694
695 capab = WLAN_CAPABILITY_ESS;
696
697 if (sband->band == IEEE80211_BAND_2GHZ) {
698 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
699 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
700 }
701
702 if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
703 capab |= WLAN_CAPABILITY_PRIVACY;
704
705 if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
706 ieee80211_hw_check(&local->hw, SPECTRUM_MGMT))
707 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
708
709 if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM)
710 capab |= WLAN_CAPABILITY_RADIO_MEASURE;
711
712 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
713 memset(mgmt, 0, 24);
714 memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
715 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
716 memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
717
718 if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
719 skb_put(skb, 10);
720 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
721 IEEE80211_STYPE_REASSOC_REQ);
722 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
723 mgmt->u.reassoc_req.listen_interval =
724 cpu_to_le16(local->hw.conf.listen_interval);
725 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
726 ETH_ALEN);
727 } else {
728 skb_put(skb, 4);
729 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
730 IEEE80211_STYPE_ASSOC_REQ);
731 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
732 mgmt->u.assoc_req.listen_interval =
733 cpu_to_le16(local->hw.conf.listen_interval);
734 }
735
736 /* SSID */
737 pos = skb_put(skb, 2 + assoc_data->ssid_len);
738 *pos++ = WLAN_EID_SSID;
739 *pos++ = assoc_data->ssid_len;
740 memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
741
742 /* add all rates which were marked to be used above */
743 supp_rates_len = rates_len;
744 if (supp_rates_len > 8)
745 supp_rates_len = 8;
746
747 pos = skb_put(skb, supp_rates_len + 2);
748 *pos++ = WLAN_EID_SUPP_RATES;
749 *pos++ = supp_rates_len;
750
751 count = 0;
752 for (i = 0; i < sband->n_bitrates; i++) {
753 if (BIT(i) & rates) {
754 int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
755 5 * (1 << shift));
756 *pos++ = (u8) rate;
757 if (++count == 8)
758 break;
759 }
760 }
761
762 if (rates_len > count) {
763 pos = skb_put(skb, rates_len - count + 2);
764 *pos++ = WLAN_EID_EXT_SUPP_RATES;
765 *pos++ = rates_len - count;
766
767 for (i++; i < sband->n_bitrates; i++) {
768 if (BIT(i) & rates) {
769 int rate;
770 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
771 5 * (1 << shift));
772 *pos++ = (u8) rate;
773 }
774 }
775 }
776
777 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT ||
778 capab & WLAN_CAPABILITY_RADIO_MEASURE) {
779 pos = skb_put(skb, 4);
780 *pos++ = WLAN_EID_PWR_CAPABILITY;
781 *pos++ = 2;
782 *pos++ = 0; /* min tx power */
783 /* max tx power */
784 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
785 }
786
787 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
788 /* TODO: get this in reg domain format */
789 pos = skb_put(skb, 2 * sband->n_channels + 2);
790 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
791 *pos++ = 2 * sband->n_channels;
792 for (i = 0; i < sband->n_channels; i++) {
793 *pos++ = ieee80211_frequency_to_channel(
794 sband->channels[i].center_freq);
795 *pos++ = 1; /* one channel in the subband*/
796 }
797 }
798
799 /* if present, add any custom IEs that go before HT */
800 if (assoc_data->ie_len) {
801 static const u8 before_ht[] = {
802 WLAN_EID_SSID,
803 WLAN_EID_SUPP_RATES,
804 WLAN_EID_EXT_SUPP_RATES,
805 WLAN_EID_PWR_CAPABILITY,
806 WLAN_EID_SUPPORTED_CHANNELS,
807 WLAN_EID_RSN,
808 WLAN_EID_QOS_CAPA,
809 WLAN_EID_RRM_ENABLED_CAPABILITIES,
810 WLAN_EID_MOBILITY_DOMAIN,
811 WLAN_EID_FAST_BSS_TRANSITION, /* reassoc only */
812 WLAN_EID_RIC_DATA, /* reassoc only */
813 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
814 };
815 static const u8 after_ric[] = {
816 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
817 WLAN_EID_HT_CAPABILITY,
818 WLAN_EID_BSS_COEX_2040,
819 WLAN_EID_EXT_CAPABILITY,
820 WLAN_EID_QOS_TRAFFIC_CAPA,
821 WLAN_EID_TIM_BCAST_REQ,
822 WLAN_EID_INTERWORKING,
823 /* 60GHz doesn't happen right now */
824 WLAN_EID_VHT_CAPABILITY,
825 WLAN_EID_OPMODE_NOTIF,
826 };
827
828 noffset = ieee80211_ie_split_ric(assoc_data->ie,
829 assoc_data->ie_len,
830 before_ht,
831 ARRAY_SIZE(before_ht),
832 after_ric,
833 ARRAY_SIZE(after_ric),
834 offset);
835 pos = skb_put(skb, noffset - offset);
836 memcpy(pos, assoc_data->ie + offset, noffset - offset);
837 offset = noffset;
838 }
839
840 if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
841 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
842 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
843
844 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
845 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
846 sband, chan, sdata->smps_mode);
847
848 /* if present, add any custom IEs that go before VHT */
849 if (assoc_data->ie_len) {
850 static const u8 before_vht[] = {
851 WLAN_EID_SSID,
852 WLAN_EID_SUPP_RATES,
853 WLAN_EID_EXT_SUPP_RATES,
854 WLAN_EID_PWR_CAPABILITY,
855 WLAN_EID_SUPPORTED_CHANNELS,
856 WLAN_EID_RSN,
857 WLAN_EID_QOS_CAPA,
858 WLAN_EID_RRM_ENABLED_CAPABILITIES,
859 WLAN_EID_MOBILITY_DOMAIN,
860 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
861 WLAN_EID_HT_CAPABILITY,
862 WLAN_EID_BSS_COEX_2040,
863 WLAN_EID_EXT_CAPABILITY,
864 WLAN_EID_QOS_TRAFFIC_CAPA,
865 WLAN_EID_TIM_BCAST_REQ,
866 WLAN_EID_INTERWORKING,
867 };
868
869 /* RIC already taken above, so no need to handle here anymore */
870 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
871 before_vht, ARRAY_SIZE(before_vht),
872 offset);
873 pos = skb_put(skb, noffset - offset);
874 memcpy(pos, assoc_data->ie + offset, noffset - offset);
875 offset = noffset;
876 }
877
878 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
879 ieee80211_add_vht_ie(sdata, skb, sband,
880 &assoc_data->ap_vht_cap);
881
882 /* if present, add any custom non-vendor IEs that go after HT */
883 if (assoc_data->ie_len) {
884 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
885 assoc_data->ie_len,
886 offset);
887 pos = skb_put(skb, noffset - offset);
888 memcpy(pos, assoc_data->ie + offset, noffset - offset);
889 offset = noffset;
890 }
891
892 if (assoc_data->wmm) {
893 if (assoc_data->uapsd) {
894 qos_info = ifmgd->uapsd_queues;
895 qos_info |= (ifmgd->uapsd_max_sp_len <<
896 IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
897 } else {
898 qos_info = 0;
899 }
900
901 pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
902 }
903
904 /* add any remaining custom (i.e. vendor specific here) IEs */
905 if (assoc_data->ie_len) {
906 noffset = assoc_data->ie_len;
907 pos = skb_put(skb, noffset - offset);
908 memcpy(pos, assoc_data->ie + offset, noffset - offset);
909 }
910
911 drv_mgd_prepare_tx(local, sdata);
912
913 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
914 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
915 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
916 IEEE80211_TX_INTFL_MLME_CONN_TX;
917 ieee80211_tx_skb(sdata, skb);
918 }
919
920 void ieee80211_send_pspoll(struct ieee80211_local *local,
921 struct ieee80211_sub_if_data *sdata)
922 {
923 struct ieee80211_pspoll *pspoll;
924 struct sk_buff *skb;
925
926 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
927 if (!skb)
928 return;
929
930 pspoll = (struct ieee80211_pspoll *) skb->data;
931 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
932
933 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
934 ieee80211_tx_skb(sdata, skb);
935 }
936
937 void ieee80211_send_nullfunc(struct ieee80211_local *local,
938 struct ieee80211_sub_if_data *sdata,
939 bool powersave)
940 {
941 struct sk_buff *skb;
942 struct ieee80211_hdr_3addr *nullfunc;
943 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
944
945 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
946 if (!skb)
947 return;
948
949 nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
950 if (powersave)
951 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
952
953 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
954 IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
955
956 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
957 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
958
959 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
960 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
961
962 ieee80211_tx_skb(sdata, skb);
963 }
964
965 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
966 struct ieee80211_sub_if_data *sdata)
967 {
968 struct sk_buff *skb;
969 struct ieee80211_hdr *nullfunc;
970 __le16 fc;
971
972 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
973 return;
974
975 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
976 if (!skb)
977 return;
978
979 skb_reserve(skb, local->hw.extra_tx_headroom);
980
981 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
982 memset(nullfunc, 0, 30);
983 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
984 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
985 nullfunc->frame_control = fc;
986 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
987 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
988 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
989 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
990
991 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
992 ieee80211_tx_skb(sdata, skb);
993 }
994
995 /* spectrum management related things */
996 static void ieee80211_chswitch_work(struct work_struct *work)
997 {
998 struct ieee80211_sub_if_data *sdata =
999 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
1000 struct ieee80211_local *local = sdata->local;
1001 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1002 int ret;
1003
1004 if (!ieee80211_sdata_running(sdata))
1005 return;
1006
1007 sdata_lock(sdata);
1008 mutex_lock(&local->mtx);
1009 mutex_lock(&local->chanctx_mtx);
1010
1011 if (!ifmgd->associated)
1012 goto out;
1013
1014 if (!sdata->vif.csa_active)
1015 goto out;
1016
1017 /*
1018 * using reservation isn't immediate as it may be deferred until later
1019 * with multi-vif. once reservation is complete it will re-schedule the
1020 * work with no reserved_chanctx so verify chandef to check if it
1021 * completed successfully
1022 */
1023
1024 if (sdata->reserved_chanctx) {
1025 /*
1026 * with multi-vif csa driver may call ieee80211_csa_finish()
1027 * many times while waiting for other interfaces to use their
1028 * reservations
1029 */
1030 if (sdata->reserved_ready)
1031 goto out;
1032
1033 ret = ieee80211_vif_use_reserved_context(sdata);
1034 if (ret) {
1035 sdata_info(sdata,
1036 "failed to use reserved channel context, disconnecting (err=%d)\n",
1037 ret);
1038 ieee80211_queue_work(&sdata->local->hw,
1039 &ifmgd->csa_connection_drop_work);
1040 goto out;
1041 }
1042
1043 goto out;
1044 }
1045
1046 if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
1047 &sdata->csa_chandef)) {
1048 sdata_info(sdata,
1049 "failed to finalize channel switch, disconnecting\n");
1050 ieee80211_queue_work(&sdata->local->hw,
1051 &ifmgd->csa_connection_drop_work);
1052 goto out;
1053 }
1054
1055 /* XXX: shouldn't really modify cfg80211-owned data! */
1056 ifmgd->associated->channel = sdata->csa_chandef.chan;
1057
1058 ifmgd->csa_waiting_bcn = true;
1059
1060 ieee80211_sta_reset_beacon_monitor(sdata);
1061 ieee80211_sta_reset_conn_monitor(sdata);
1062
1063 out:
1064 mutex_unlock(&local->chanctx_mtx);
1065 mutex_unlock(&local->mtx);
1066 sdata_unlock(sdata);
1067 }
1068
1069 static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata)
1070 {
1071 struct ieee80211_local *local = sdata->local;
1072 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1073 int ret;
1074
1075 sdata_assert_lock(sdata);
1076
1077 WARN_ON(!sdata->vif.csa_active);
1078
1079 if (sdata->csa_block_tx) {
1080 ieee80211_wake_vif_queues(local, sdata,
1081 IEEE80211_QUEUE_STOP_REASON_CSA);
1082 sdata->csa_block_tx = false;
1083 }
1084
1085 sdata->vif.csa_active = false;
1086 ifmgd->csa_waiting_bcn = false;
1087
1088 ret = drv_post_channel_switch(sdata);
1089 if (ret) {
1090 sdata_info(sdata,
1091 "driver post channel switch failed, disconnecting\n");
1092 ieee80211_queue_work(&local->hw,
1093 &ifmgd->csa_connection_drop_work);
1094 return;
1095 }
1096
1097 cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef);
1098 }
1099
1100 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
1101 {
1102 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1103 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1104
1105 trace_api_chswitch_done(sdata, success);
1106 if (!success) {
1107 sdata_info(sdata,
1108 "driver channel switch failed, disconnecting\n");
1109 ieee80211_queue_work(&sdata->local->hw,
1110 &ifmgd->csa_connection_drop_work);
1111 } else {
1112 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1113 }
1114 }
1115 EXPORT_SYMBOL(ieee80211_chswitch_done);
1116
1117 static void ieee80211_chswitch_timer(unsigned long data)
1118 {
1119 struct ieee80211_sub_if_data *sdata =
1120 (struct ieee80211_sub_if_data *) data;
1121
1122 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1123 }
1124
1125 static void
1126 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1127 u64 timestamp, u32 device_timestamp,
1128 struct ieee802_11_elems *elems,
1129 bool beacon)
1130 {
1131 struct ieee80211_local *local = sdata->local;
1132 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1133 struct cfg80211_bss *cbss = ifmgd->associated;
1134 struct ieee80211_chanctx_conf *conf;
1135 struct ieee80211_chanctx *chanctx;
1136 enum ieee80211_band current_band;
1137 struct ieee80211_csa_ie csa_ie;
1138 struct ieee80211_channel_switch ch_switch;
1139 int res;
1140
1141 sdata_assert_lock(sdata);
1142
1143 if (!cbss)
1144 return;
1145
1146 if (local->scanning)
1147 return;
1148
1149 /* disregard subsequent announcements if we are already processing */
1150 if (sdata->vif.csa_active)
1151 return;
1152
1153 current_band = cbss->channel->band;
1154 memset(&csa_ie, 0, sizeof(csa_ie));
1155 res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
1156 ifmgd->flags,
1157 ifmgd->associated->bssid, &csa_ie);
1158 if (res < 0)
1159 ieee80211_queue_work(&local->hw,
1160 &ifmgd->csa_connection_drop_work);
1161 if (res)
1162 return;
1163
1164 if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1165 IEEE80211_CHAN_DISABLED)) {
1166 sdata_info(sdata,
1167 "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1168 ifmgd->associated->bssid,
1169 csa_ie.chandef.chan->center_freq,
1170 csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1171 csa_ie.chandef.center_freq2);
1172 ieee80211_queue_work(&local->hw,
1173 &ifmgd->csa_connection_drop_work);
1174 return;
1175 }
1176
1177 if (cfg80211_chandef_identical(&csa_ie.chandef,
1178 &sdata->vif.bss_conf.chandef)) {
1179 if (ifmgd->csa_ignored_same_chan)
1180 return;
1181 sdata_info(sdata,
1182 "AP %pM tries to chanswitch to same channel, ignore\n",
1183 ifmgd->associated->bssid);
1184 ifmgd->csa_ignored_same_chan = true;
1185 return;
1186 }
1187
1188 /*
1189 * Drop all TDLS peers - either we disconnect or move to a different
1190 * channel from this point on. There's no telling what our peer will do.
1191 * The TDLS WIDER_BW scenario is also problematic, as peers might now
1192 * have an incompatible wider chandef.
1193 */
1194 ieee80211_teardown_tdls_peers(sdata);
1195
1196 mutex_lock(&local->mtx);
1197 mutex_lock(&local->chanctx_mtx);
1198 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1199 lockdep_is_held(&local->chanctx_mtx));
1200 if (!conf) {
1201 sdata_info(sdata,
1202 "no channel context assigned to vif?, disconnecting\n");
1203 goto drop_connection;
1204 }
1205
1206 chanctx = container_of(conf, struct ieee80211_chanctx, conf);
1207
1208 if (local->use_chanctx &&
1209 !ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA)) {
1210 sdata_info(sdata,
1211 "driver doesn't support chan-switch with channel contexts\n");
1212 goto drop_connection;
1213 }
1214
1215 ch_switch.timestamp = timestamp;
1216 ch_switch.device_timestamp = device_timestamp;
1217 ch_switch.block_tx = csa_ie.mode;
1218 ch_switch.chandef = csa_ie.chandef;
1219 ch_switch.count = csa_ie.count;
1220
1221 if (drv_pre_channel_switch(sdata, &ch_switch)) {
1222 sdata_info(sdata,
1223 "preparing for channel switch failed, disconnecting\n");
1224 goto drop_connection;
1225 }
1226
1227 res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
1228 chanctx->mode, false);
1229 if (res) {
1230 sdata_info(sdata,
1231 "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
1232 res);
1233 goto drop_connection;
1234 }
1235 mutex_unlock(&local->chanctx_mtx);
1236
1237 sdata->vif.csa_active = true;
1238 sdata->csa_chandef = csa_ie.chandef;
1239 sdata->csa_block_tx = csa_ie.mode;
1240 ifmgd->csa_ignored_same_chan = false;
1241
1242 if (sdata->csa_block_tx)
1243 ieee80211_stop_vif_queues(local, sdata,
1244 IEEE80211_QUEUE_STOP_REASON_CSA);
1245 mutex_unlock(&local->mtx);
1246
1247 cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
1248 csa_ie.count);
1249
1250 if (local->ops->channel_switch) {
1251 /* use driver's channel switch callback */
1252 drv_channel_switch(local, sdata, &ch_switch);
1253 return;
1254 }
1255
1256 /* channel switch handled in software */
1257 if (csa_ie.count <= 1)
1258 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1259 else
1260 mod_timer(&ifmgd->chswitch_timer,
1261 TU_TO_EXP_TIME((csa_ie.count - 1) *
1262 cbss->beacon_interval));
1263 return;
1264 drop_connection:
1265 ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work);
1266 mutex_unlock(&local->chanctx_mtx);
1267 mutex_unlock(&local->mtx);
1268 }
1269
1270 static bool
1271 ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
1272 struct ieee80211_channel *channel,
1273 const u8 *country_ie, u8 country_ie_len,
1274 const u8 *pwr_constr_elem,
1275 int *chan_pwr, int *pwr_reduction)
1276 {
1277 struct ieee80211_country_ie_triplet *triplet;
1278 int chan = ieee80211_frequency_to_channel(channel->center_freq);
1279 int i, chan_increment;
1280 bool have_chan_pwr = false;
1281
1282 /* Invalid IE */
1283 if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1284 return false;
1285
1286 triplet = (void *)(country_ie + 3);
1287 country_ie_len -= 3;
1288
1289 switch (channel->band) {
1290 default:
1291 WARN_ON_ONCE(1);
1292 /* fall through */
1293 case IEEE80211_BAND_2GHZ:
1294 case IEEE80211_BAND_60GHZ:
1295 chan_increment = 1;
1296 break;
1297 case IEEE80211_BAND_5GHZ:
1298 chan_increment = 4;
1299 break;
1300 }
1301
1302 /* find channel */
1303 while (country_ie_len >= 3) {
1304 u8 first_channel = triplet->chans.first_channel;
1305
1306 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1307 goto next;
1308
1309 for (i = 0; i < triplet->chans.num_channels; i++) {
1310 if (first_channel + i * chan_increment == chan) {
1311 have_chan_pwr = true;
1312 *chan_pwr = triplet->chans.max_power;
1313 break;
1314 }
1315 }
1316 if (have_chan_pwr)
1317 break;
1318
1319 next:
1320 triplet++;
1321 country_ie_len -= 3;
1322 }
1323
1324 if (have_chan_pwr && pwr_constr_elem)
1325 *pwr_reduction = *pwr_constr_elem;
1326 else
1327 *pwr_reduction = 0;
1328
1329 return have_chan_pwr;
1330 }
1331
1332 static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata,
1333 struct ieee80211_channel *channel,
1334 const u8 *cisco_dtpc_ie,
1335 int *pwr_level)
1336 {
1337 /* From practical testing, the first data byte of the DTPC element
1338 * seems to contain the requested dBm level, and the CLI on Cisco
1339 * APs clearly state the range is -127 to 127 dBm, which indicates
1340 * a signed byte, although it seemingly never actually goes negative.
1341 * The other byte seems to always be zero.
1342 */
1343 *pwr_level = (__s8)cisco_dtpc_ie[4];
1344 }
1345
1346 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1347 struct ieee80211_channel *channel,
1348 struct ieee80211_mgmt *mgmt,
1349 const u8 *country_ie, u8 country_ie_len,
1350 const u8 *pwr_constr_ie,
1351 const u8 *cisco_dtpc_ie)
1352 {
1353 bool has_80211h_pwr = false, has_cisco_pwr = false;
1354 int chan_pwr = 0, pwr_reduction_80211h = 0;
1355 int pwr_level_cisco, pwr_level_80211h;
1356 int new_ap_level;
1357 __le16 capab = mgmt->u.probe_resp.capab_info;
1358
1359 if (country_ie &&
1360 (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) ||
1361 capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) {
1362 has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
1363 sdata, channel, country_ie, country_ie_len,
1364 pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1365 pwr_level_80211h =
1366 max_t(int, 0, chan_pwr - pwr_reduction_80211h);
1367 }
1368
1369 if (cisco_dtpc_ie) {
1370 ieee80211_find_cisco_dtpc(
1371 sdata, channel, cisco_dtpc_ie, &pwr_level_cisco);
1372 has_cisco_pwr = true;
1373 }
1374
1375 if (!has_80211h_pwr && !has_cisco_pwr)
1376 return 0;
1377
1378 /* If we have both 802.11h and Cisco DTPC, apply both limits
1379 * by picking the smallest of the two power levels advertised.
1380 */
1381 if (has_80211h_pwr &&
1382 (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) {
1383 sdata_dbg(sdata,
1384 "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1385 pwr_level_80211h, chan_pwr, pwr_reduction_80211h,
1386 sdata->u.mgd.bssid);
1387 new_ap_level = pwr_level_80211h;
1388 } else { /* has_cisco_pwr is always true here. */
1389 sdata_dbg(sdata,
1390 "Limiting TX power to %d dBm as advertised by %pM\n",
1391 pwr_level_cisco, sdata->u.mgd.bssid);
1392 new_ap_level = pwr_level_cisco;
1393 }
1394
1395 if (sdata->ap_power_level == new_ap_level)
1396 return 0;
1397
1398 sdata->ap_power_level = new_ap_level;
1399 if (__ieee80211_recalc_txpower(sdata))
1400 return BSS_CHANGED_TXPOWER;
1401 return 0;
1402 }
1403
1404 /* powersave */
1405 static void ieee80211_enable_ps(struct ieee80211_local *local,
1406 struct ieee80211_sub_if_data *sdata)
1407 {
1408 struct ieee80211_conf *conf = &local->hw.conf;
1409
1410 /*
1411 * If we are scanning right now then the parameters will
1412 * take effect when scan finishes.
1413 */
1414 if (local->scanning)
1415 return;
1416
1417 if (conf->dynamic_ps_timeout > 0 &&
1418 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) {
1419 mod_timer(&local->dynamic_ps_timer, jiffies +
1420 msecs_to_jiffies(conf->dynamic_ps_timeout));
1421 } else {
1422 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
1423 ieee80211_send_nullfunc(local, sdata, true);
1424
1425 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1426 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
1427 return;
1428
1429 conf->flags |= IEEE80211_CONF_PS;
1430 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1431 }
1432 }
1433
1434 static void ieee80211_change_ps(struct ieee80211_local *local)
1435 {
1436 struct ieee80211_conf *conf = &local->hw.conf;
1437
1438 if (local->ps_sdata) {
1439 ieee80211_enable_ps(local, local->ps_sdata);
1440 } else if (conf->flags & IEEE80211_CONF_PS) {
1441 conf->flags &= ~IEEE80211_CONF_PS;
1442 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1443 del_timer_sync(&local->dynamic_ps_timer);
1444 cancel_work_sync(&local->dynamic_ps_enable_work);
1445 }
1446 }
1447
1448 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1449 {
1450 struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1451 struct sta_info *sta = NULL;
1452 bool authorized = false;
1453
1454 if (!mgd->powersave)
1455 return false;
1456
1457 if (mgd->broken_ap)
1458 return false;
1459
1460 if (!mgd->associated)
1461 return false;
1462
1463 if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1464 return false;
1465
1466 if (!mgd->have_beacon)
1467 return false;
1468
1469 rcu_read_lock();
1470 sta = sta_info_get(sdata, mgd->bssid);
1471 if (sta)
1472 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1473 rcu_read_unlock();
1474
1475 return authorized;
1476 }
1477
1478 /* need to hold RTNL or interface lock */
1479 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1480 {
1481 struct ieee80211_sub_if_data *sdata, *found = NULL;
1482 int count = 0;
1483 int timeout;
1484
1485 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) {
1486 local->ps_sdata = NULL;
1487 return;
1488 }
1489
1490 list_for_each_entry(sdata, &local->interfaces, list) {
1491 if (!ieee80211_sdata_running(sdata))
1492 continue;
1493 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1494 /* If an AP vif is found, then disable PS
1495 * by setting the count to zero thereby setting
1496 * ps_sdata to NULL.
1497 */
1498 count = 0;
1499 break;
1500 }
1501 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1502 continue;
1503 found = sdata;
1504 count++;
1505 }
1506
1507 if (count == 1 && ieee80211_powersave_allowed(found)) {
1508 s32 beaconint_us;
1509
1510 if (latency < 0)
1511 latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1512
1513 beaconint_us = ieee80211_tu_to_usec(
1514 found->vif.bss_conf.beacon_int);
1515
1516 timeout = local->dynamic_ps_forced_timeout;
1517 if (timeout < 0) {
1518 /*
1519 * Go to full PSM if the user configures a very low
1520 * latency requirement.
1521 * The 2000 second value is there for compatibility
1522 * until the PM_QOS_NETWORK_LATENCY is configured
1523 * with real values.
1524 */
1525 if (latency > (1900 * USEC_PER_MSEC) &&
1526 latency != (2000 * USEC_PER_SEC))
1527 timeout = 0;
1528 else
1529 timeout = 100;
1530 }
1531 local->hw.conf.dynamic_ps_timeout = timeout;
1532
1533 if (beaconint_us > latency) {
1534 local->ps_sdata = NULL;
1535 } else {
1536 int maxslp = 1;
1537 u8 dtimper = found->u.mgd.dtim_period;
1538
1539 /* If the TIM IE is invalid, pretend the value is 1 */
1540 if (!dtimper)
1541 dtimper = 1;
1542 else if (dtimper > 1)
1543 maxslp = min_t(int, dtimper,
1544 latency / beaconint_us);
1545
1546 local->hw.conf.max_sleep_period = maxslp;
1547 local->hw.conf.ps_dtim_period = dtimper;
1548 local->ps_sdata = found;
1549 }
1550 } else {
1551 local->ps_sdata = NULL;
1552 }
1553
1554 ieee80211_change_ps(local);
1555 }
1556
1557 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1558 {
1559 bool ps_allowed = ieee80211_powersave_allowed(sdata);
1560
1561 if (sdata->vif.bss_conf.ps != ps_allowed) {
1562 sdata->vif.bss_conf.ps = ps_allowed;
1563 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1564 }
1565 }
1566
1567 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1568 {
1569 struct ieee80211_local *local =
1570 container_of(work, struct ieee80211_local,
1571 dynamic_ps_disable_work);
1572
1573 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1574 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1575 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1576 }
1577
1578 ieee80211_wake_queues_by_reason(&local->hw,
1579 IEEE80211_MAX_QUEUE_MAP,
1580 IEEE80211_QUEUE_STOP_REASON_PS,
1581 false);
1582 }
1583
1584 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1585 {
1586 struct ieee80211_local *local =
1587 container_of(work, struct ieee80211_local,
1588 dynamic_ps_enable_work);
1589 struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1590 struct ieee80211_if_managed *ifmgd;
1591 unsigned long flags;
1592 int q;
1593
1594 /* can only happen when PS was just disabled anyway */
1595 if (!sdata)
1596 return;
1597
1598 ifmgd = &sdata->u.mgd;
1599
1600 if (local->hw.conf.flags & IEEE80211_CONF_PS)
1601 return;
1602
1603 if (local->hw.conf.dynamic_ps_timeout > 0) {
1604 /* don't enter PS if TX frames are pending */
1605 if (drv_tx_frames_pending(local)) {
1606 mod_timer(&local->dynamic_ps_timer, jiffies +
1607 msecs_to_jiffies(
1608 local->hw.conf.dynamic_ps_timeout));
1609 return;
1610 }
1611
1612 /*
1613 * transmission can be stopped by others which leads to
1614 * dynamic_ps_timer expiry. Postpone the ps timer if it
1615 * is not the actual idle state.
1616 */
1617 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1618 for (q = 0; q < local->hw.queues; q++) {
1619 if (local->queue_stop_reasons[q]) {
1620 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1621 flags);
1622 mod_timer(&local->dynamic_ps_timer, jiffies +
1623 msecs_to_jiffies(
1624 local->hw.conf.dynamic_ps_timeout));
1625 return;
1626 }
1627 }
1628 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1629 }
1630
1631 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1632 !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1633 if (drv_tx_frames_pending(local)) {
1634 mod_timer(&local->dynamic_ps_timer, jiffies +
1635 msecs_to_jiffies(
1636 local->hw.conf.dynamic_ps_timeout));
1637 } else {
1638 ieee80211_send_nullfunc(local, sdata, true);
1639 /* Flush to get the tx status of nullfunc frame */
1640 ieee80211_flush_queues(local, sdata, false);
1641 }
1642 }
1643
1644 if (!(ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
1645 ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) ||
1646 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1647 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1648 local->hw.conf.flags |= IEEE80211_CONF_PS;
1649 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1650 }
1651 }
1652
1653 void ieee80211_dynamic_ps_timer(unsigned long data)
1654 {
1655 struct ieee80211_local *local = (void *) data;
1656
1657 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1658 }
1659
1660 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1661 {
1662 struct delayed_work *delayed_work =
1663 container_of(work, struct delayed_work, work);
1664 struct ieee80211_sub_if_data *sdata =
1665 container_of(delayed_work, struct ieee80211_sub_if_data,
1666 dfs_cac_timer_work);
1667 struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1668
1669 mutex_lock(&sdata->local->mtx);
1670 if (sdata->wdev.cac_started) {
1671 ieee80211_vif_release_channel(sdata);
1672 cfg80211_cac_event(sdata->dev, &chandef,
1673 NL80211_RADAR_CAC_FINISHED,
1674 GFP_KERNEL);
1675 }
1676 mutex_unlock(&sdata->local->mtx);
1677 }
1678
1679 static bool
1680 __ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1681 {
1682 struct ieee80211_local *local = sdata->local;
1683 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1684 bool ret = false;
1685 int ac;
1686
1687 if (local->hw.queues < IEEE80211_NUM_ACS)
1688 return false;
1689
1690 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1691 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
1692 int non_acm_ac;
1693 unsigned long now = jiffies;
1694
1695 if (tx_tspec->action == TX_TSPEC_ACTION_NONE &&
1696 tx_tspec->admitted_time &&
1697 time_after(now, tx_tspec->time_slice_start + HZ)) {
1698 tx_tspec->consumed_tx_time = 0;
1699 tx_tspec->time_slice_start = now;
1700
1701 if (tx_tspec->downgraded)
1702 tx_tspec->action =
1703 TX_TSPEC_ACTION_STOP_DOWNGRADE;
1704 }
1705
1706 switch (tx_tspec->action) {
1707 case TX_TSPEC_ACTION_STOP_DOWNGRADE:
1708 /* take the original parameters */
1709 if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[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 tx_tspec->downgraded = false;
1715 ret = true;
1716 break;
1717 case TX_TSPEC_ACTION_DOWNGRADE:
1718 if (time_after(now, tx_tspec->time_slice_start + HZ)) {
1719 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1720 ret = true;
1721 break;
1722 }
1723 /* downgrade next lower non-ACM AC */
1724 for (non_acm_ac = ac + 1;
1725 non_acm_ac < IEEE80211_NUM_ACS;
1726 non_acm_ac++)
1727 if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac)))
1728 break;
1729 /* The loop will result in using BK even if it requires
1730 * admission control, such configuration makes no sense
1731 * and we have to transmit somehow - the AC selection
1732 * does the same thing.
1733 */
1734 if (drv_conf_tx(local, sdata, ac,
1735 &sdata->tx_conf[non_acm_ac]))
1736 sdata_err(sdata,
1737 "failed to set TX queue parameters for queue %d\n",
1738 ac);
1739 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1740 ret = true;
1741 schedule_delayed_work(&ifmgd->tx_tspec_wk,
1742 tx_tspec->time_slice_start + HZ - now + 1);
1743 break;
1744 case TX_TSPEC_ACTION_NONE:
1745 /* nothing now */
1746 break;
1747 }
1748 }
1749
1750 return ret;
1751 }
1752
1753 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1754 {
1755 if (__ieee80211_sta_handle_tspec_ac_params(sdata))
1756 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
1757 }
1758
1759 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work)
1760 {
1761 struct ieee80211_sub_if_data *sdata;
1762
1763 sdata = container_of(work, struct ieee80211_sub_if_data,
1764 u.mgd.tx_tspec_wk.work);
1765 ieee80211_sta_handle_tspec_ac_params(sdata);
1766 }
1767
1768 /* MLME */
1769 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1770 struct ieee80211_sub_if_data *sdata,
1771 const u8 *wmm_param, size_t wmm_param_len)
1772 {
1773 struct ieee80211_tx_queue_params params;
1774 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1775 size_t left;
1776 int count;
1777 const u8 *pos;
1778 u8 uapsd_queues = 0;
1779
1780 if (!local->ops->conf_tx)
1781 return false;
1782
1783 if (local->hw.queues < IEEE80211_NUM_ACS)
1784 return false;
1785
1786 if (!wmm_param)
1787 return false;
1788
1789 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1790 return false;
1791
1792 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1793 uapsd_queues = ifmgd->uapsd_queues;
1794
1795 count = wmm_param[6] & 0x0f;
1796 if (count == ifmgd->wmm_last_param_set)
1797 return false;
1798 ifmgd->wmm_last_param_set = count;
1799
1800 pos = wmm_param + 8;
1801 left = wmm_param_len - 8;
1802
1803 memset(&params, 0, sizeof(params));
1804
1805 sdata->wmm_acm = 0;
1806 for (; left >= 4; left -= 4, pos += 4) {
1807 int aci = (pos[0] >> 5) & 0x03;
1808 int acm = (pos[0] >> 4) & 0x01;
1809 bool uapsd = false;
1810 int queue;
1811
1812 switch (aci) {
1813 case 1: /* AC_BK */
1814 queue = 3;
1815 if (acm)
1816 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1817 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1818 uapsd = true;
1819 break;
1820 case 2: /* AC_VI */
1821 queue = 1;
1822 if (acm)
1823 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1824 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1825 uapsd = true;
1826 break;
1827 case 3: /* AC_VO */
1828 queue = 0;
1829 if (acm)
1830 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1831 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1832 uapsd = true;
1833 break;
1834 case 0: /* AC_BE */
1835 default:
1836 queue = 2;
1837 if (acm)
1838 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1839 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1840 uapsd = true;
1841 break;
1842 }
1843
1844 params.aifs = pos[0] & 0x0f;
1845 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1846 params.cw_min = ecw2cw(pos[1] & 0x0f);
1847 params.txop = get_unaligned_le16(pos + 2);
1848 params.acm = acm;
1849 params.uapsd = uapsd;
1850
1851 mlme_dbg(sdata,
1852 "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n",
1853 queue, aci, acm,
1854 params.aifs, params.cw_min, params.cw_max,
1855 params.txop, params.uapsd,
1856 ifmgd->tx_tspec[queue].downgraded);
1857 sdata->tx_conf[queue] = params;
1858 if (!ifmgd->tx_tspec[queue].downgraded &&
1859 drv_conf_tx(local, sdata, queue, &params))
1860 sdata_err(sdata,
1861 "failed to set TX queue parameters for queue %d\n",
1862 queue);
1863 }
1864
1865 /* enable WMM or activate new settings */
1866 sdata->vif.bss_conf.qos = true;
1867 return true;
1868 }
1869
1870 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1871 {
1872 lockdep_assert_held(&sdata->local->mtx);
1873
1874 sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1875 ieee80211_run_deferred_scan(sdata->local);
1876 }
1877
1878 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1879 {
1880 mutex_lock(&sdata->local->mtx);
1881 __ieee80211_stop_poll(sdata);
1882 mutex_unlock(&sdata->local->mtx);
1883 }
1884
1885 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1886 u16 capab, bool erp_valid, u8 erp)
1887 {
1888 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1889 u32 changed = 0;
1890 bool use_protection;
1891 bool use_short_preamble;
1892 bool use_short_slot;
1893
1894 if (erp_valid) {
1895 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1896 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1897 } else {
1898 use_protection = false;
1899 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1900 }
1901
1902 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1903 if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1904 use_short_slot = true;
1905
1906 if (use_protection != bss_conf->use_cts_prot) {
1907 bss_conf->use_cts_prot = use_protection;
1908 changed |= BSS_CHANGED_ERP_CTS_PROT;
1909 }
1910
1911 if (use_short_preamble != bss_conf->use_short_preamble) {
1912 bss_conf->use_short_preamble = use_short_preamble;
1913 changed |= BSS_CHANGED_ERP_PREAMBLE;
1914 }
1915
1916 if (use_short_slot != bss_conf->use_short_slot) {
1917 bss_conf->use_short_slot = use_short_slot;
1918 changed |= BSS_CHANGED_ERP_SLOT;
1919 }
1920
1921 return changed;
1922 }
1923
1924 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1925 struct cfg80211_bss *cbss,
1926 u32 bss_info_changed)
1927 {
1928 struct ieee80211_bss *bss = (void *)cbss->priv;
1929 struct ieee80211_local *local = sdata->local;
1930 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1931
1932 bss_info_changed |= BSS_CHANGED_ASSOC;
1933 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1934 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1935
1936 sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1937 beacon_loss_count * bss_conf->beacon_int));
1938
1939 sdata->u.mgd.associated = cbss;
1940 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1941
1942 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1943
1944 if (sdata->vif.p2p) {
1945 const struct cfg80211_bss_ies *ies;
1946
1947 rcu_read_lock();
1948 ies = rcu_dereference(cbss->ies);
1949 if (ies) {
1950 int ret;
1951
1952 ret = cfg80211_get_p2p_attr(
1953 ies->data, ies->len,
1954 IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1955 (u8 *) &bss_conf->p2p_noa_attr,
1956 sizeof(bss_conf->p2p_noa_attr));
1957 if (ret >= 2) {
1958 sdata->u.mgd.p2p_noa_index =
1959 bss_conf->p2p_noa_attr.index;
1960 bss_info_changed |= BSS_CHANGED_P2P_PS;
1961 }
1962 }
1963 rcu_read_unlock();
1964 }
1965
1966 /* just to be sure */
1967 ieee80211_stop_poll(sdata);
1968
1969 ieee80211_led_assoc(local, 1);
1970
1971 if (sdata->u.mgd.have_beacon) {
1972 /*
1973 * If the AP is buggy we may get here with no DTIM period
1974 * known, so assume it's 1 which is the only safe assumption
1975 * in that case, although if the TIM IE is broken powersave
1976 * probably just won't work at all.
1977 */
1978 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1979 bss_conf->beacon_rate = bss->beacon_rate;
1980 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1981 } else {
1982 bss_conf->beacon_rate = NULL;
1983 bss_conf->dtim_period = 0;
1984 }
1985
1986 bss_conf->assoc = 1;
1987
1988 /* Tell the driver to monitor connection quality (if supported) */
1989 if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1990 bss_conf->cqm_rssi_thold)
1991 bss_info_changed |= BSS_CHANGED_CQM;
1992
1993 /* Enable ARP filtering */
1994 if (bss_conf->arp_addr_cnt)
1995 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1996
1997 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1998
1999 mutex_lock(&local->iflist_mtx);
2000 ieee80211_recalc_ps(local, -1);
2001 mutex_unlock(&local->iflist_mtx);
2002
2003 ieee80211_recalc_smps(sdata);
2004 ieee80211_recalc_ps_vif(sdata);
2005
2006 netif_carrier_on(sdata->dev);
2007 }
2008
2009 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
2010 u16 stype, u16 reason, bool tx,
2011 u8 *frame_buf)
2012 {
2013 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2014 struct ieee80211_local *local = sdata->local;
2015 u32 changed = 0;
2016
2017 sdata_assert_lock(sdata);
2018
2019 if (WARN_ON_ONCE(tx && !frame_buf))
2020 return;
2021
2022 if (WARN_ON(!ifmgd->associated))
2023 return;
2024
2025 ieee80211_stop_poll(sdata);
2026
2027 ifmgd->associated = NULL;
2028 netif_carrier_off(sdata->dev);
2029
2030 /*
2031 * if we want to get out of ps before disassoc (why?) we have
2032 * to do it before sending disassoc, as otherwise the null-packet
2033 * won't be valid.
2034 */
2035 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2036 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2037 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2038 }
2039 local->ps_sdata = NULL;
2040
2041 /* disable per-vif ps */
2042 ieee80211_recalc_ps_vif(sdata);
2043
2044 /* make sure ongoing transmission finishes */
2045 synchronize_net();
2046
2047 /*
2048 * drop any frame before deauth/disassoc, this can be data or
2049 * management frame. Since we are disconnecting, we should not
2050 * insist sending these frames which can take time and delay
2051 * the disconnection and possible the roaming.
2052 */
2053 if (tx)
2054 ieee80211_flush_queues(local, sdata, true);
2055
2056 /* deauthenticate/disassociate now */
2057 if (tx || frame_buf)
2058 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
2059 reason, tx, frame_buf);
2060
2061 /* flush out frame - make sure the deauth was actually sent */
2062 if (tx)
2063 ieee80211_flush_queues(local, sdata, false);
2064
2065 /* clear bssid only after building the needed mgmt frames */
2066 eth_zero_addr(ifmgd->bssid);
2067
2068 /* remove AP and TDLS peers */
2069 sta_info_flush(sdata);
2070
2071 /* finally reset all BSS / config parameters */
2072 changed |= ieee80211_reset_erp_info(sdata);
2073
2074 ieee80211_led_assoc(local, 0);
2075 changed |= BSS_CHANGED_ASSOC;
2076 sdata->vif.bss_conf.assoc = false;
2077
2078 ifmgd->p2p_noa_index = -1;
2079 memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
2080 sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2081
2082 /* on the next assoc, re-program HT/VHT parameters */
2083 memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
2084 memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2085 memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
2086 memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2087 sdata->flags &= ~IEEE80211_SDATA_MU_MIMO_OWNER;
2088
2089 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2090
2091 del_timer_sync(&local->dynamic_ps_timer);
2092 cancel_work_sync(&local->dynamic_ps_enable_work);
2093
2094 /* Disable ARP filtering */
2095 if (sdata->vif.bss_conf.arp_addr_cnt)
2096 changed |= BSS_CHANGED_ARP_FILTER;
2097
2098 sdata->vif.bss_conf.qos = false;
2099 changed |= BSS_CHANGED_QOS;
2100
2101 /* The BSSID (not really interesting) and HT changed */
2102 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
2103 ieee80211_bss_info_change_notify(sdata, changed);
2104
2105 /* disassociated - set to defaults now */
2106 ieee80211_set_wmm_default(sdata, false);
2107
2108 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
2109 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
2110 del_timer_sync(&sdata->u.mgd.timer);
2111 del_timer_sync(&sdata->u.mgd.chswitch_timer);
2112
2113 sdata->vif.bss_conf.dtim_period = 0;
2114 sdata->vif.bss_conf.beacon_rate = NULL;
2115
2116 ifmgd->have_beacon = false;
2117
2118 ifmgd->flags = 0;
2119 mutex_lock(&local->mtx);
2120 ieee80211_vif_release_channel(sdata);
2121
2122 sdata->vif.csa_active = false;
2123 ifmgd->csa_waiting_bcn = false;
2124 ifmgd->csa_ignored_same_chan = false;
2125 if (sdata->csa_block_tx) {
2126 ieee80211_wake_vif_queues(local, sdata,
2127 IEEE80211_QUEUE_STOP_REASON_CSA);
2128 sdata->csa_block_tx = false;
2129 }
2130 mutex_unlock(&local->mtx);
2131
2132 /* existing TX TSPEC sessions no longer exist */
2133 memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
2134 cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);
2135
2136 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2137 }
2138
2139 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
2140 struct ieee80211_hdr *hdr)
2141 {
2142 /*
2143 * We can postpone the mgd.timer whenever receiving unicast frames
2144 * from AP because we know that the connection is working both ways
2145 * at that time. But multicast frames (and hence also beacons) must
2146 * be ignored here, because we need to trigger the timer during
2147 * data idle periods for sending the periodic probe request to the
2148 * AP we're connected to.
2149 */
2150 if (is_multicast_ether_addr(hdr->addr1))
2151 return;
2152
2153 ieee80211_sta_reset_conn_monitor(sdata);
2154 }
2155
2156 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
2157 {
2158 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2159 struct ieee80211_local *local = sdata->local;
2160
2161 mutex_lock(&local->mtx);
2162 if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
2163 goto out;
2164
2165 __ieee80211_stop_poll(sdata);
2166
2167 mutex_lock(&local->iflist_mtx);
2168 ieee80211_recalc_ps(local, -1);
2169 mutex_unlock(&local->iflist_mtx);
2170
2171 if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
2172 goto out;
2173
2174 /*
2175 * We've received a probe response, but are not sure whether
2176 * we have or will be receiving any beacons or data, so let's
2177 * schedule the timers again, just in case.
2178 */
2179 ieee80211_sta_reset_beacon_monitor(sdata);
2180
2181 mod_timer(&ifmgd->conn_mon_timer,
2182 round_jiffies_up(jiffies +
2183 IEEE80211_CONNECTION_IDLE_TIME));
2184 out:
2185 mutex_unlock(&local->mtx);
2186 }
2187
2188 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
2189 struct ieee80211_hdr *hdr,
2190 u16 tx_time)
2191 {
2192 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2193 u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2194 int ac = ieee80211_ac_from_tid(tid);
2195 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
2196 unsigned long now = jiffies;
2197
2198 if (likely(!tx_tspec->admitted_time))
2199 return;
2200
2201 if (time_after(now, tx_tspec->time_slice_start + HZ)) {
2202 tx_tspec->consumed_tx_time = 0;
2203 tx_tspec->time_slice_start = now;
2204
2205 if (tx_tspec->downgraded) {
2206 tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE;
2207 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2208 }
2209 }
2210
2211 if (tx_tspec->downgraded)
2212 return;
2213
2214 tx_tspec->consumed_tx_time += tx_time;
2215
2216 if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) {
2217 tx_tspec->downgraded = true;
2218 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE;
2219 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2220 }
2221 }
2222
2223 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2224 struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2225 {
2226 ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);
2227
2228 if (!ieee80211_is_data(hdr->frame_control))
2229 return;
2230
2231 if (ieee80211_is_nullfunc(hdr->frame_control) &&
2232 sdata->u.mgd.probe_send_count > 0) {
2233 if (ack)
2234 ieee80211_sta_reset_conn_monitor(sdata);
2235 else
2236 sdata->u.mgd.nullfunc_failed = true;
2237 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2238 return;
2239 }
2240
2241 if (ack)
2242 ieee80211_sta_reset_conn_monitor(sdata);
2243 }
2244
2245 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
2246 {
2247 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2248 const u8 *ssid;
2249 u8 *dst = ifmgd->associated->bssid;
2250 u8 unicast_limit = max(1, max_probe_tries - 3);
2251
2252 /*
2253 * Try sending broadcast probe requests for the last three
2254 * probe requests after the first ones failed since some
2255 * buggy APs only support broadcast probe requests.
2256 */
2257 if (ifmgd->probe_send_count >= unicast_limit)
2258 dst = NULL;
2259
2260 /*
2261 * When the hardware reports an accurate Tx ACK status, it's
2262 * better to send a nullfunc frame instead of a probe request,
2263 * as it will kick us off the AP quickly if we aren't associated
2264 * anymore. The timeout will be reset if the frame is ACKed by
2265 * the AP.
2266 */
2267 ifmgd->probe_send_count++;
2268
2269 if (ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
2270 ifmgd->nullfunc_failed = false;
2271 ieee80211_send_nullfunc(sdata->local, sdata, false);
2272 } else {
2273 int ssid_len;
2274
2275 rcu_read_lock();
2276 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2277 if (WARN_ON_ONCE(ssid == NULL))
2278 ssid_len = 0;
2279 else
2280 ssid_len = ssid[1];
2281
2282 ieee80211_send_probe_req(sdata, sdata->vif.addr, dst,
2283 ssid + 2, ssid_len, NULL,
2284 0, (u32) -1, true, 0,
2285 ifmgd->associated->channel, false);
2286 rcu_read_unlock();
2287 }
2288
2289 ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2290 run_again(sdata, ifmgd->probe_timeout);
2291 }
2292
2293 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
2294 bool beacon)
2295 {
2296 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2297 bool already = false;
2298
2299 if (!ieee80211_sdata_running(sdata))
2300 return;
2301
2302 sdata_lock(sdata);
2303
2304 if (!ifmgd->associated)
2305 goto out;
2306
2307 mutex_lock(&sdata->local->mtx);
2308
2309 if (sdata->local->tmp_channel || sdata->local->scanning) {
2310 mutex_unlock(&sdata->local->mtx);
2311 goto out;
2312 }
2313
2314 if (beacon) {
2315 mlme_dbg_ratelimited(sdata,
2316 "detected beacon loss from AP (missed %d beacons) - probing\n",
2317 beacon_loss_count);
2318
2319 ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL);
2320 }
2321
2322 /*
2323 * The driver/our work has already reported this event or the
2324 * connection monitoring has kicked in and we have already sent
2325 * a probe request. Or maybe the AP died and the driver keeps
2326 * reporting until we disassociate...
2327 *
2328 * In either case we have to ignore the current call to this
2329 * function (except for setting the correct probe reason bit)
2330 * because otherwise we would reset the timer every time and
2331 * never check whether we received a probe response!
2332 */
2333 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
2334 already = true;
2335
2336 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2337
2338 mutex_unlock(&sdata->local->mtx);
2339
2340 if (already)
2341 goto out;
2342
2343 mutex_lock(&sdata->local->iflist_mtx);
2344 ieee80211_recalc_ps(sdata->local, -1);
2345 mutex_unlock(&sdata->local->iflist_mtx);
2346
2347 ifmgd->probe_send_count = 0;
2348 ieee80211_mgd_probe_ap_send(sdata);
2349 out:
2350 sdata_unlock(sdata);
2351 }
2352
2353 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2354 struct ieee80211_vif *vif)
2355 {
2356 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2357 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2358 struct cfg80211_bss *cbss;
2359 struct sk_buff *skb;
2360 const u8 *ssid;
2361 int ssid_len;
2362
2363 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2364 return NULL;
2365
2366 sdata_assert_lock(sdata);
2367
2368 if (ifmgd->associated)
2369 cbss = ifmgd->associated;
2370 else if (ifmgd->auth_data)
2371 cbss = ifmgd->auth_data->bss;
2372 else if (ifmgd->assoc_data)
2373 cbss = ifmgd->assoc_data->bss;
2374 else
2375 return NULL;
2376
2377 rcu_read_lock();
2378 ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2379 if (WARN_ON_ONCE(ssid == NULL))
2380 ssid_len = 0;
2381 else
2382 ssid_len = ssid[1];
2383
2384 skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
2385 (u32) -1, cbss->channel,
2386 ssid + 2, ssid_len,
2387 NULL, 0, true);
2388 rcu_read_unlock();
2389
2390 return skb;
2391 }
2392 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2393
2394 static void ieee80211_report_disconnect(struct ieee80211_sub_if_data *sdata,
2395 const u8 *buf, size_t len, bool tx,
2396 u16 reason)
2397 {
2398 struct ieee80211_event event = {
2399 .type = MLME_EVENT,
2400 .u.mlme.data = tx ? DEAUTH_TX_EVENT : DEAUTH_RX_EVENT,
2401 .u.mlme.reason = reason,
2402 };
2403
2404 if (tx)
2405 cfg80211_tx_mlme_mgmt(sdata->dev, buf, len);
2406 else
2407 cfg80211_rx_mlme_mgmt(sdata->dev, buf, len);
2408
2409 drv_event_callback(sdata->local, sdata, &event);
2410 }
2411
2412 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2413 {
2414 struct ieee80211_local *local = sdata->local;
2415 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2416 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2417
2418 sdata_lock(sdata);
2419 if (!ifmgd->associated) {
2420 sdata_unlock(sdata);
2421 return;
2422 }
2423
2424 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2425 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2426 true, frame_buf);
2427 mutex_lock(&local->mtx);
2428 sdata->vif.csa_active = false;
2429 ifmgd->csa_waiting_bcn = false;
2430 if (sdata->csa_block_tx) {
2431 ieee80211_wake_vif_queues(local, sdata,
2432 IEEE80211_QUEUE_STOP_REASON_CSA);
2433 sdata->csa_block_tx = false;
2434 }
2435 mutex_unlock(&local->mtx);
2436
2437 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
2438 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2439
2440 sdata_unlock(sdata);
2441 }
2442
2443 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2444 {
2445 struct ieee80211_sub_if_data *sdata =
2446 container_of(work, struct ieee80211_sub_if_data,
2447 u.mgd.beacon_connection_loss_work);
2448 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2449 struct sta_info *sta;
2450
2451 if (ifmgd->associated) {
2452 rcu_read_lock();
2453 sta = sta_info_get(sdata, ifmgd->bssid);
2454 if (sta)
2455 sta->beacon_loss_count++;
2456 rcu_read_unlock();
2457 }
2458
2459 if (ifmgd->connection_loss) {
2460 sdata_info(sdata, "Connection to AP %pM lost\n",
2461 ifmgd->bssid);
2462 __ieee80211_disconnect(sdata);
2463 } else {
2464 ieee80211_mgd_probe_ap(sdata, true);
2465 }
2466 }
2467
2468 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2469 {
2470 struct ieee80211_sub_if_data *sdata =
2471 container_of(work, struct ieee80211_sub_if_data,
2472 u.mgd.csa_connection_drop_work);
2473
2474 __ieee80211_disconnect(sdata);
2475 }
2476
2477 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2478 {
2479 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2480 struct ieee80211_hw *hw = &sdata->local->hw;
2481
2482 trace_api_beacon_loss(sdata);
2483
2484 sdata->u.mgd.connection_loss = false;
2485 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2486 }
2487 EXPORT_SYMBOL(ieee80211_beacon_loss);
2488
2489 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2490 {
2491 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2492 struct ieee80211_hw *hw = &sdata->local->hw;
2493
2494 trace_api_connection_loss(sdata);
2495
2496 sdata->u.mgd.connection_loss = true;
2497 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2498 }
2499 EXPORT_SYMBOL(ieee80211_connection_loss);
2500
2501
2502 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2503 bool assoc)
2504 {
2505 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2506
2507 sdata_assert_lock(sdata);
2508
2509 if (!assoc) {
2510 /*
2511 * we are not authenticated yet, the only timer that could be
2512 * running is the timeout for the authentication response which
2513 * which is not relevant anymore.
2514 */
2515 del_timer_sync(&sdata->u.mgd.timer);
2516 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2517
2518 eth_zero_addr(sdata->u.mgd.bssid);
2519 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2520 sdata->u.mgd.flags = 0;
2521 mutex_lock(&sdata->local->mtx);
2522 ieee80211_vif_release_channel(sdata);
2523 mutex_unlock(&sdata->local->mtx);
2524 }
2525
2526 cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2527 kfree(auth_data);
2528 sdata->u.mgd.auth_data = NULL;
2529 }
2530
2531 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2532 bool assoc)
2533 {
2534 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2535
2536 sdata_assert_lock(sdata);
2537
2538 if (!assoc) {
2539 /*
2540 * we are not associated yet, the only timer that could be
2541 * running is the timeout for the association response which
2542 * which is not relevant anymore.
2543 */
2544 del_timer_sync(&sdata->u.mgd.timer);
2545 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2546
2547 eth_zero_addr(sdata->u.mgd.bssid);
2548 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2549 sdata->u.mgd.flags = 0;
2550 sdata->flags &= ~IEEE80211_SDATA_MU_MIMO_OWNER;
2551 mutex_lock(&sdata->local->mtx);
2552 ieee80211_vif_release_channel(sdata);
2553 mutex_unlock(&sdata->local->mtx);
2554 }
2555
2556 kfree(assoc_data);
2557 sdata->u.mgd.assoc_data = NULL;
2558 }
2559
2560 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2561 struct ieee80211_mgmt *mgmt, size_t len)
2562 {
2563 struct ieee80211_local *local = sdata->local;
2564 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2565 u8 *pos;
2566 struct ieee802_11_elems elems;
2567 u32 tx_flags = 0;
2568
2569 pos = mgmt->u.auth.variable;
2570 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2571 if (!elems.challenge)
2572 return;
2573 auth_data->expected_transaction = 4;
2574 drv_mgd_prepare_tx(sdata->local, sdata);
2575 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
2576 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2577 IEEE80211_TX_INTFL_MLME_CONN_TX;
2578 ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2579 elems.challenge - 2, elems.challenge_len + 2,
2580 auth_data->bss->bssid, auth_data->bss->bssid,
2581 auth_data->key, auth_data->key_len,
2582 auth_data->key_idx, tx_flags);
2583 }
2584
2585 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2586 struct ieee80211_mgmt *mgmt, size_t len)
2587 {
2588 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2589 u8 bssid[ETH_ALEN];
2590 u16 auth_alg, auth_transaction, status_code;
2591 struct sta_info *sta;
2592 struct ieee80211_event event = {
2593 .type = MLME_EVENT,
2594 .u.mlme.data = AUTH_EVENT,
2595 };
2596
2597 sdata_assert_lock(sdata);
2598
2599 if (len < 24 + 6)
2600 return;
2601
2602 if (!ifmgd->auth_data || ifmgd->auth_data->done)
2603 return;
2604
2605 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2606
2607 if (!ether_addr_equal(bssid, mgmt->bssid))
2608 return;
2609
2610 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2611 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2612 status_code = le16_to_cpu(mgmt->u.auth.status_code);
2613
2614 if (auth_alg != ifmgd->auth_data->algorithm ||
2615 auth_transaction != ifmgd->auth_data->expected_transaction) {
2616 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2617 mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2618 auth_transaction,
2619 ifmgd->auth_data->expected_transaction);
2620 return;
2621 }
2622
2623 if (status_code != WLAN_STATUS_SUCCESS) {
2624 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2625 mgmt->sa, status_code);
2626 ieee80211_destroy_auth_data(sdata, false);
2627 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2628 event.u.mlme.status = MLME_DENIED;
2629 event.u.mlme.reason = status_code;
2630 drv_event_callback(sdata->local, sdata, &event);
2631 return;
2632 }
2633
2634 switch (ifmgd->auth_data->algorithm) {
2635 case WLAN_AUTH_OPEN:
2636 case WLAN_AUTH_LEAP:
2637 case WLAN_AUTH_FT:
2638 case WLAN_AUTH_SAE:
2639 break;
2640 case WLAN_AUTH_SHARED_KEY:
2641 if (ifmgd->auth_data->expected_transaction != 4) {
2642 ieee80211_auth_challenge(sdata, mgmt, len);
2643 /* need another frame */
2644 return;
2645 }
2646 break;
2647 default:
2648 WARN_ONCE(1, "invalid auth alg %d",
2649 ifmgd->auth_data->algorithm);
2650 return;
2651 }
2652
2653 event.u.mlme.status = MLME_SUCCESS;
2654 drv_event_callback(sdata->local, sdata, &event);
2655 sdata_info(sdata, "authenticated\n");
2656 ifmgd->auth_data->done = true;
2657 ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2658 ifmgd->auth_data->timeout_started = true;
2659 run_again(sdata, ifmgd->auth_data->timeout);
2660
2661 if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2662 ifmgd->auth_data->expected_transaction != 2) {
2663 /*
2664 * Report auth frame to user space for processing since another
2665 * round of Authentication frames is still needed.
2666 */
2667 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2668 return;
2669 }
2670
2671 /* move station state to auth */
2672 mutex_lock(&sdata->local->sta_mtx);
2673 sta = sta_info_get(sdata, bssid);
2674 if (!sta) {
2675 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2676 goto out_err;
2677 }
2678 if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2679 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2680 goto out_err;
2681 }
2682 mutex_unlock(&sdata->local->sta_mtx);
2683
2684 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2685 return;
2686 out_err:
2687 mutex_unlock(&sdata->local->sta_mtx);
2688 /* ignore frame -- wait for timeout */
2689 }
2690
2691 #define case_WLAN(type) \
2692 case WLAN_REASON_##type: return #type
2693
2694 static const char *ieee80211_get_reason_code_string(u16 reason_code)
2695 {
2696 switch (reason_code) {
2697 case_WLAN(UNSPECIFIED);
2698 case_WLAN(PREV_AUTH_NOT_VALID);
2699 case_WLAN(DEAUTH_LEAVING);
2700 case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2701 case_WLAN(DISASSOC_AP_BUSY);
2702 case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2703 case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2704 case_WLAN(DISASSOC_STA_HAS_LEFT);
2705 case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2706 case_WLAN(DISASSOC_BAD_POWER);
2707 case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2708 case_WLAN(INVALID_IE);
2709 case_WLAN(MIC_FAILURE);
2710 case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2711 case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2712 case_WLAN(IE_DIFFERENT);
2713 case_WLAN(INVALID_GROUP_CIPHER);
2714 case_WLAN(INVALID_PAIRWISE_CIPHER);
2715 case_WLAN(INVALID_AKMP);
2716 case_WLAN(UNSUPP_RSN_VERSION);
2717 case_WLAN(INVALID_RSN_IE_CAP);
2718 case_WLAN(IEEE8021X_FAILED);
2719 case_WLAN(CIPHER_SUITE_REJECTED);
2720 case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2721 case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2722 case_WLAN(DISASSOC_LOW_ACK);
2723 case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2724 case_WLAN(QSTA_LEAVE_QBSS);
2725 case_WLAN(QSTA_NOT_USE);
2726 case_WLAN(QSTA_REQUIRE_SETUP);
2727 case_WLAN(QSTA_TIMEOUT);
2728 case_WLAN(QSTA_CIPHER_NOT_SUPP);
2729 case_WLAN(MESH_PEER_CANCELED);
2730 case_WLAN(MESH_MAX_PEERS);
2731 case_WLAN(MESH_CONFIG);
2732 case_WLAN(MESH_CLOSE);
2733 case_WLAN(MESH_MAX_RETRIES);
2734 case_WLAN(MESH_CONFIRM_TIMEOUT);
2735 case_WLAN(MESH_INVALID_GTK);
2736 case_WLAN(MESH_INCONSISTENT_PARAM);
2737 case_WLAN(MESH_INVALID_SECURITY);
2738 case_WLAN(MESH_PATH_ERROR);
2739 case_WLAN(MESH_PATH_NOFORWARD);
2740 case_WLAN(MESH_PATH_DEST_UNREACHABLE);
2741 case_WLAN(MAC_EXISTS_IN_MBSS);
2742 case_WLAN(MESH_CHAN_REGULATORY);
2743 case_WLAN(MESH_CHAN);
2744 default: return "<unknown>";
2745 }
2746 }
2747
2748 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2749 struct ieee80211_mgmt *mgmt, size_t len)
2750 {
2751 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2752 u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2753
2754 sdata_assert_lock(sdata);
2755
2756 if (len < 24 + 2)
2757 return;
2758
2759 if (ifmgd->associated &&
2760 ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) {
2761 const u8 *bssid = ifmgd->associated->bssid;
2762
2763 sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
2764 bssid, reason_code,
2765 ieee80211_get_reason_code_string(reason_code));
2766
2767 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2768
2769 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false,
2770 reason_code);
2771 return;
2772 }
2773
2774 if (ifmgd->assoc_data &&
2775 ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2776 const u8 *bssid = ifmgd->assoc_data->bss->bssid;
2777
2778 sdata_info(sdata,
2779 "deauthenticated from %pM while associating (Reason: %u=%s)\n",
2780 bssid, reason_code,
2781 ieee80211_get_reason_code_string(reason_code));
2782
2783 ieee80211_destroy_assoc_data(sdata, false);
2784
2785 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2786 return;
2787 }
2788 }
2789
2790
2791 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2792 struct ieee80211_mgmt *mgmt, size_t len)
2793 {
2794 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2795 u16 reason_code;
2796
2797 sdata_assert_lock(sdata);
2798
2799 if (len < 24 + 2)
2800 return;
2801
2802 if (!ifmgd->associated ||
2803 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2804 return;
2805
2806 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2807
2808 sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2809 mgmt->sa, reason_code);
2810
2811 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2812
2813 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code);
2814 }
2815
2816 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2817 u8 *supp_rates, unsigned int supp_rates_len,
2818 u32 *rates, u32 *basic_rates,
2819 bool *have_higher_than_11mbit,
2820 int *min_rate, int *min_rate_index,
2821 int shift, u32 rate_flags)
2822 {
2823 int i, j;
2824
2825 for (i = 0; i < supp_rates_len; i++) {
2826 int rate = supp_rates[i] & 0x7f;
2827 bool is_basic = !!(supp_rates[i] & 0x80);
2828
2829 if ((rate * 5 * (1 << shift)) > 110)
2830 *have_higher_than_11mbit = true;
2831
2832 /*
2833 * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2834 * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2835 *
2836 * Note: Even through the membership selector and the basic
2837 * rate flag share the same bit, they are not exactly
2838 * the same.
2839 */
2840 if (!!(supp_rates[i] & 0x80) &&
2841 (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2842 continue;
2843
2844 for (j = 0; j < sband->n_bitrates; j++) {
2845 struct ieee80211_rate *br;
2846 int brate;
2847
2848 br = &sband->bitrates[j];
2849 if ((rate_flags & br->flags) != rate_flags)
2850 continue;
2851
2852 brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2853 if (brate == rate) {
2854 *rates |= BIT(j);
2855 if (is_basic)
2856 *basic_rates |= BIT(j);
2857 if ((rate * 5) < *min_rate) {
2858 *min_rate = rate * 5;
2859 *min_rate_index = j;
2860 }
2861 break;
2862 }
2863 }
2864 }
2865 }
2866
2867 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2868 struct cfg80211_bss *cbss,
2869 struct ieee80211_mgmt *mgmt, size_t len)
2870 {
2871 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2872 struct ieee80211_local *local = sdata->local;
2873 struct ieee80211_supported_band *sband;
2874 struct sta_info *sta;
2875 u8 *pos;
2876 u16 capab_info, aid;
2877 struct ieee802_11_elems elems;
2878 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2879 const struct cfg80211_bss_ies *bss_ies = NULL;
2880 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2881 u32 changed = 0;
2882 int err;
2883 bool ret;
2884
2885 /* AssocResp and ReassocResp have identical structure */
2886
2887 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2888 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2889
2890 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2891 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2892 aid);
2893 aid &= ~(BIT(15) | BIT(14));
2894
2895 ifmgd->broken_ap = false;
2896
2897 if (aid == 0 || aid > IEEE80211_MAX_AID) {
2898 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2899 aid);
2900 aid = 0;
2901 ifmgd->broken_ap = true;
2902 }
2903
2904 pos = mgmt->u.assoc_resp.variable;
2905 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2906
2907 if (!elems.supp_rates) {
2908 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2909 return false;
2910 }
2911
2912 ifmgd->aid = aid;
2913 ifmgd->tdls_chan_switch_prohibited =
2914 elems.ext_capab && elems.ext_capab_len >= 5 &&
2915 (elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
2916
2917 /*
2918 * Some APs are erroneously not including some information in their
2919 * (re)association response frames. Try to recover by using the data
2920 * from the beacon or probe response. This seems to afflict mobile
2921 * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2922 * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2923 */
2924 if ((assoc_data->wmm && !elems.wmm_param) ||
2925 (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2926 (!elems.ht_cap_elem || !elems.ht_operation)) ||
2927 (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2928 (!elems.vht_cap_elem || !elems.vht_operation))) {
2929 const struct cfg80211_bss_ies *ies;
2930 struct ieee802_11_elems bss_elems;
2931
2932 rcu_read_lock();
2933 ies = rcu_dereference(cbss->ies);
2934 if (ies)
2935 bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2936 GFP_ATOMIC);
2937 rcu_read_unlock();
2938 if (!bss_ies)
2939 return false;
2940
2941 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2942 false, &bss_elems);
2943 if (assoc_data->wmm &&
2944 !elems.wmm_param && bss_elems.wmm_param) {
2945 elems.wmm_param = bss_elems.wmm_param;
2946 sdata_info(sdata,
2947 "AP bug: WMM param missing from AssocResp\n");
2948 }
2949
2950 /*
2951 * Also check if we requested HT/VHT, otherwise the AP doesn't
2952 * have to include the IEs in the (re)association response.
2953 */
2954 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2955 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2956 elems.ht_cap_elem = bss_elems.ht_cap_elem;
2957 sdata_info(sdata,
2958 "AP bug: HT capability missing from AssocResp\n");
2959 }
2960 if (!elems.ht_operation && bss_elems.ht_operation &&
2961 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2962 elems.ht_operation = bss_elems.ht_operation;
2963 sdata_info(sdata,
2964 "AP bug: HT operation missing from AssocResp\n");
2965 }
2966 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2967 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2968 elems.vht_cap_elem = bss_elems.vht_cap_elem;
2969 sdata_info(sdata,
2970 "AP bug: VHT capa missing from AssocResp\n");
2971 }
2972 if (!elems.vht_operation && bss_elems.vht_operation &&
2973 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2974 elems.vht_operation = bss_elems.vht_operation;
2975 sdata_info(sdata,
2976 "AP bug: VHT operation missing from AssocResp\n");
2977 }
2978 }
2979
2980 /*
2981 * We previously checked these in the beacon/probe response, so
2982 * they should be present here. This is just a safety net.
2983 */
2984 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2985 (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2986 sdata_info(sdata,
2987 "HT AP is missing WMM params or HT capability/operation\n");
2988 ret = false;
2989 goto out;
2990 }
2991
2992 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2993 (!elems.vht_cap_elem || !elems.vht_operation)) {
2994 sdata_info(sdata,
2995 "VHT AP is missing VHT capability/operation\n");
2996 ret = false;
2997 goto out;
2998 }
2999
3000 mutex_lock(&sdata->local->sta_mtx);
3001 /*
3002 * station info was already allocated and inserted before
3003 * the association and should be available to us
3004 */
3005 sta = sta_info_get(sdata, cbss->bssid);
3006 if (WARN_ON(!sta)) {
3007 mutex_unlock(&sdata->local->sta_mtx);
3008 ret = false;
3009 goto out;
3010 }
3011
3012 sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
3013
3014 /* Set up internal HT/VHT capabilities */
3015 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
3016 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
3017 elems.ht_cap_elem, sta);
3018
3019 if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
3020 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
3021 elems.vht_cap_elem, sta);
3022
3023 /*
3024 * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
3025 * in their association response, so ignore that data for our own
3026 * configuration. If it changed since the last beacon, we'll get the
3027 * next beacon and update then.
3028 */
3029
3030 /*
3031 * If an operating mode notification IE is present, override the
3032 * NSS calculation (that would be done in rate_control_rate_init())
3033 * and use the # of streams from that element.
3034 */
3035 if (elems.opmode_notif &&
3036 !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
3037 u8 nss;
3038
3039 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
3040 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
3041 nss += 1;
3042 sta->sta.rx_nss = nss;
3043 }
3044
3045 rate_control_rate_init(sta);
3046
3047 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
3048 set_sta_flag(sta, WLAN_STA_MFP);
3049
3050 sta->sta.wme = elems.wmm_param && local->hw.queues >= IEEE80211_NUM_ACS;
3051
3052 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
3053 if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
3054 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
3055 if (err) {
3056 sdata_info(sdata,
3057 "failed to move station %pM to desired state\n",
3058 sta->sta.addr);
3059 WARN_ON(__sta_info_destroy(sta));
3060 mutex_unlock(&sdata->local->sta_mtx);
3061 ret = false;
3062 goto out;
3063 }
3064
3065 mutex_unlock(&sdata->local->sta_mtx);
3066
3067 /*
3068 * Always handle WMM once after association regardless
3069 * of the first value the AP uses. Setting -1 here has
3070 * that effect because the AP values is an unsigned
3071 * 4-bit value.
3072 */
3073 ifmgd->wmm_last_param_set = -1;
3074
3075 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && elems.wmm_param)
3076 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3077 elems.wmm_param_len);
3078 else
3079 ieee80211_set_wmm_default(sdata, false);
3080 changed |= BSS_CHANGED_QOS;
3081
3082 /* set AID and assoc capability,
3083 * ieee80211_set_associated() will tell the driver */
3084 bss_conf->aid = aid;
3085 bss_conf->assoc_capability = capab_info;
3086 ieee80211_set_associated(sdata, cbss, changed);
3087
3088 /*
3089 * If we're using 4-addr mode, let the AP know that we're
3090 * doing so, so that it can create the STA VLAN on its side
3091 */
3092 if (ifmgd->use_4addr)
3093 ieee80211_send_4addr_nullfunc(local, sdata);
3094
3095 /*
3096 * Start timer to probe the connection to the AP now.
3097 * Also start the timer that will detect beacon loss.
3098 */
3099 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
3100 ieee80211_sta_reset_beacon_monitor(sdata);
3101
3102 ret = true;
3103 out:
3104 kfree(bss_ies);
3105 return ret;
3106 }
3107
3108 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
3109 struct ieee80211_mgmt *mgmt,
3110 size_t len)
3111 {
3112 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3113 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
3114 u16 capab_info, status_code, aid;
3115 struct ieee802_11_elems elems;
3116 int ac, uapsd_queues = -1;
3117 u8 *pos;
3118 bool reassoc;
3119 struct cfg80211_bss *bss;
3120 struct ieee80211_event event = {
3121 .type = MLME_EVENT,
3122 .u.mlme.data = ASSOC_EVENT,
3123 };
3124
3125 sdata_assert_lock(sdata);
3126
3127 if (!assoc_data)
3128 return;
3129 if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3130 return;
3131
3132 /*
3133 * AssocResp and ReassocResp have identical structure, so process both
3134 * of them in this function.
3135 */
3136
3137 if (len < 24 + 6)
3138 return;
3139
3140 reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
3141 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
3142 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
3143 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
3144
3145 sdata_info(sdata,
3146 "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
3147 reassoc ? "Rea" : "A", mgmt->sa,
3148 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
3149
3150 pos = mgmt->u.assoc_resp.variable;
3151 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
3152
3153 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3154 elems.timeout_int &&
3155 elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
3156 u32 tu, ms;
3157 tu = le32_to_cpu(elems.timeout_int->value);
3158 ms = tu * 1024 / 1000;
3159 sdata_info(sdata,
3160 "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
3161 mgmt->sa, tu, ms);
3162 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3163 assoc_data->timeout_started = true;
3164 if (ms > IEEE80211_ASSOC_TIMEOUT)
3165 run_again(sdata, assoc_data->timeout);
3166 return;
3167 }
3168
3169 bss = assoc_data->bss;
3170
3171 if (status_code != WLAN_STATUS_SUCCESS) {
3172 sdata_info(sdata, "%pM denied association (code=%d)\n",
3173 mgmt->sa, status_code);
3174 ieee80211_destroy_assoc_data(sdata, false);
3175 event.u.mlme.status = MLME_DENIED;
3176 event.u.mlme.reason = status_code;
3177 drv_event_callback(sdata->local, sdata, &event);
3178 } else {
3179 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
3180 /* oops -- internal error -- send timeout for now */
3181 ieee80211_destroy_assoc_data(sdata, false);
3182 cfg80211_assoc_timeout(sdata->dev, bss);
3183 return;
3184 }
3185 event.u.mlme.status = MLME_SUCCESS;
3186 drv_event_callback(sdata->local, sdata, &event);
3187 sdata_info(sdata, "associated\n");
3188
3189 /*
3190 * destroy assoc_data afterwards, as otherwise an idle
3191 * recalc after assoc_data is NULL but before associated
3192 * is set can cause the interface to go idle
3193 */
3194 ieee80211_destroy_assoc_data(sdata, true);
3195
3196 /* get uapsd queues configuration */
3197 uapsd_queues = 0;
3198 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
3199 if (sdata->tx_conf[ac].uapsd)
3200 uapsd_queues |= BIT(ac);
3201 }
3202
3203 cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
3204 }
3205
3206 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
3207 struct ieee80211_mgmt *mgmt, size_t len,
3208 struct ieee80211_rx_status *rx_status,
3209 struct ieee802_11_elems *elems)
3210 {
3211 struct ieee80211_local *local = sdata->local;
3212 struct ieee80211_bss *bss;
3213 struct ieee80211_channel *channel;
3214
3215 sdata_assert_lock(sdata);
3216
3217 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
3218 if (!channel)
3219 return;
3220
3221 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3222 channel);
3223 if (bss) {
3224 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3225 ieee80211_rx_bss_put(local, bss);
3226 }
3227 }
3228
3229
3230 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
3231 struct sk_buff *skb)
3232 {
3233 struct ieee80211_mgmt *mgmt = (void *)skb->data;
3234 struct ieee80211_if_managed *ifmgd;
3235 struct ieee80211_rx_status *rx_status = (void *) skb->cb;
3236 size_t baselen, len = skb->len;
3237 struct ieee802_11_elems elems;
3238
3239 ifmgd = &sdata->u.mgd;
3240
3241 sdata_assert_lock(sdata);
3242
3243 if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3244 return; /* ignore ProbeResp to foreign address */
3245
3246 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
3247 if (baselen > len)
3248 return;
3249
3250 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3251 false, &elems);
3252
3253 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3254
3255 if (ifmgd->associated &&
3256 ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3257 ieee80211_reset_ap_probe(sdata);
3258 }
3259
3260 /*
3261 * This is the canonical list of information elements we care about,
3262 * the filter code also gives us all changes to the Microsoft OUI
3263 * (00:50:F2) vendor IE which is used for WMM which we need to track,
3264 * as well as the DTPC IE (part of the Cisco OUI) used for signaling
3265 * changes to requested client power.
3266 *
3267 * We implement beacon filtering in software since that means we can
3268 * avoid processing the frame here and in cfg80211, and userspace
3269 * will not be able to tell whether the hardware supports it or not.
3270 *
3271 * XXX: This list needs to be dynamic -- userspace needs to be able to
3272 * add items it requires. It also needs to be able to tell us to
3273 * look out for other vendor IEs.
3274 */
3275 static const u64 care_about_ies =
3276 (1ULL << WLAN_EID_COUNTRY) |
3277 (1ULL << WLAN_EID_ERP_INFO) |
3278 (1ULL << WLAN_EID_CHANNEL_SWITCH) |
3279 (1ULL << WLAN_EID_PWR_CONSTRAINT) |
3280 (1ULL << WLAN_EID_HT_CAPABILITY) |
3281 (1ULL << WLAN_EID_HT_OPERATION) |
3282 (1ULL << WLAN_EID_EXT_CHANSWITCH_ANN);
3283
3284 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
3285 struct ieee80211_mgmt *mgmt, size_t len,
3286 struct ieee80211_rx_status *rx_status)
3287 {
3288 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3289 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3290 size_t baselen;
3291 struct ieee802_11_elems elems;
3292 struct ieee80211_local *local = sdata->local;
3293 struct ieee80211_chanctx_conf *chanctx_conf;
3294 struct ieee80211_channel *chan;
3295 struct sta_info *sta;
3296 u32 changed = 0;
3297 bool erp_valid;
3298 u8 erp_value = 0;
3299 u32 ncrc;
3300 u8 *bssid;
3301 u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3302
3303 sdata_assert_lock(sdata);
3304
3305 /* Process beacon from the current BSS */
3306 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
3307 if (baselen > len)
3308 return;
3309
3310 rcu_read_lock();
3311 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3312 if (!chanctx_conf) {
3313 rcu_read_unlock();
3314 return;
3315 }
3316
3317 if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
3318 rcu_read_unlock();
3319 return;
3320 }
3321 chan = chanctx_conf->def.chan;
3322 rcu_read_unlock();
3323
3324 if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3325 ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
3326 ieee802_11_parse_elems(mgmt->u.beacon.variable,
3327 len - baselen, false, &elems);
3328
3329 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3330 if (elems.tim && !elems.parse_error) {
3331 const struct ieee80211_tim_ie *tim_ie = elems.tim;
3332 ifmgd->dtim_period = tim_ie->dtim_period;
3333 }
3334 ifmgd->have_beacon = true;
3335 ifmgd->assoc_data->need_beacon = false;
3336 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3337 sdata->vif.bss_conf.sync_tsf =
3338 le64_to_cpu(mgmt->u.beacon.timestamp);
3339 sdata->vif.bss_conf.sync_device_ts =
3340 rx_status->device_timestamp;
3341 if (elems.tim)
3342 sdata->vif.bss_conf.sync_dtim_count =
3343 elems.tim->dtim_count;
3344 else
3345 sdata->vif.bss_conf.sync_dtim_count = 0;
3346 }
3347 /* continue assoc process */
3348 ifmgd->assoc_data->timeout = jiffies;
3349 ifmgd->assoc_data->timeout_started = true;
3350 run_again(sdata, ifmgd->assoc_data->timeout);
3351 return;
3352 }
3353
3354 if (!ifmgd->associated ||
3355 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3356 return;
3357 bssid = ifmgd->associated->bssid;
3358
3359 /* Track average RSSI from the Beacon frames of the current AP */
3360 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
3361 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3362 ewma_beacon_signal_init(&ifmgd->ave_beacon_signal);
3363 ifmgd->last_cqm_event_signal = 0;
3364 ifmgd->count_beacon_signal = 1;
3365 ifmgd->last_ave_beacon_signal = 0;
3366 } else {
3367 ifmgd->count_beacon_signal++;
3368 }
3369
3370 ewma_beacon_signal_add(&ifmgd->ave_beacon_signal, -rx_status->signal);
3371
3372 if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3373 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3374 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3375 int last_sig = ifmgd->last_ave_beacon_signal;
3376 struct ieee80211_event event = {
3377 .type = RSSI_EVENT,
3378 };
3379
3380 /*
3381 * if signal crosses either of the boundaries, invoke callback
3382 * with appropriate parameters
3383 */
3384 if (sig > ifmgd->rssi_max_thold &&
3385 (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3386 ifmgd->last_ave_beacon_signal = sig;
3387 event.u.rssi.data = RSSI_EVENT_HIGH;
3388 drv_event_callback(local, sdata, &event);
3389 } else if (sig < ifmgd->rssi_min_thold &&
3390 (last_sig >= ifmgd->rssi_max_thold ||
3391 last_sig == 0)) {
3392 ifmgd->last_ave_beacon_signal = sig;
3393 event.u.rssi.data = RSSI_EVENT_LOW;
3394 drv_event_callback(local, sdata, &event);
3395 }
3396 }
3397
3398 if (bss_conf->cqm_rssi_thold &&
3399 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3400 !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3401 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3402 int last_event = ifmgd->last_cqm_event_signal;
3403 int thold = bss_conf->cqm_rssi_thold;
3404 int hyst = bss_conf->cqm_rssi_hyst;
3405
3406 if (sig < thold &&
3407 (last_event == 0 || sig < last_event - hyst)) {
3408 ifmgd->last_cqm_event_signal = sig;
3409 ieee80211_cqm_rssi_notify(
3410 &sdata->vif,
3411 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3412 GFP_KERNEL);
3413 } else if (sig > thold &&
3414 (last_event == 0 || sig > last_event + hyst)) {
3415 ifmgd->last_cqm_event_signal = sig;
3416 ieee80211_cqm_rssi_notify(
3417 &sdata->vif,
3418 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3419 GFP_KERNEL);
3420 }
3421 }
3422
3423 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3424 mlme_dbg_ratelimited(sdata,
3425 "cancelling AP probe due to a received beacon\n");
3426 ieee80211_reset_ap_probe(sdata);
3427 }
3428
3429 /*
3430 * Push the beacon loss detection into the future since
3431 * we are processing a beacon from the AP just now.
3432 */
3433 ieee80211_sta_reset_beacon_monitor(sdata);
3434
3435 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3436 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3437 len - baselen, false, &elems,
3438 care_about_ies, ncrc);
3439
3440 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
3441 ieee80211_check_tim(elems.tim, elems.tim_len, ifmgd->aid)) {
3442 if (local->hw.conf.dynamic_ps_timeout > 0) {
3443 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3444 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3445 ieee80211_hw_config(local,
3446 IEEE80211_CONF_CHANGE_PS);
3447 }
3448 ieee80211_send_nullfunc(local, sdata, false);
3449 } else if (!local->pspolling && sdata->u.mgd.powersave) {
3450 local->pspolling = true;
3451
3452 /*
3453 * Here is assumed that the driver will be
3454 * able to send ps-poll frame and receive a
3455 * response even though power save mode is
3456 * enabled, but some drivers might require
3457 * to disable power save here. This needs
3458 * to be investigated.
3459 */
3460 ieee80211_send_pspoll(local, sdata);
3461 }
3462 }
3463
3464 if (sdata->vif.p2p) {
3465 struct ieee80211_p2p_noa_attr noa = {};
3466 int ret;
3467
3468 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3469 len - baselen,
3470 IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3471 (u8 *) &noa, sizeof(noa));
3472 if (ret >= 2) {
3473 if (sdata->u.mgd.p2p_noa_index != noa.index) {
3474 /* valid noa_attr and index changed */
3475 sdata->u.mgd.p2p_noa_index = noa.index;
3476 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3477 changed |= BSS_CHANGED_P2P_PS;
3478 /*
3479 * make sure we update all information, the CRC
3480 * mechanism doesn't look at P2P attributes.
3481 */
3482 ifmgd->beacon_crc_valid = false;
3483 }
3484 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3485 /* noa_attr not found and we had valid noa_attr before */
3486 sdata->u.mgd.p2p_noa_index = -1;
3487 memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3488 changed |= BSS_CHANGED_P2P_PS;
3489 ifmgd->beacon_crc_valid = false;
3490 }
3491 }
3492
3493 if (ifmgd->csa_waiting_bcn)
3494 ieee80211_chswitch_post_beacon(sdata);
3495
3496 /*
3497 * Update beacon timing and dtim count on every beacon appearance. This
3498 * will allow the driver to use the most updated values. Do it before
3499 * comparing this one with last received beacon.
3500 * IMPORTANT: These parameters would possibly be out of sync by the time
3501 * the driver will use them. The synchronized view is currently
3502 * guaranteed only in certain callbacks.
3503 */
3504 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3505 sdata->vif.bss_conf.sync_tsf =
3506 le64_to_cpu(mgmt->u.beacon.timestamp);
3507 sdata->vif.bss_conf.sync_device_ts =
3508 rx_status->device_timestamp;
3509 if (elems.tim)
3510 sdata->vif.bss_conf.sync_dtim_count =
3511 elems.tim->dtim_count;
3512 else
3513 sdata->vif.bss_conf.sync_dtim_count = 0;
3514 }
3515
3516 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3517 return;
3518 ifmgd->beacon_crc = ncrc;
3519 ifmgd->beacon_crc_valid = true;
3520
3521 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3522
3523 ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3524 rx_status->device_timestamp,
3525 &elems, true);
3526
3527 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3528 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3529 elems.wmm_param_len))
3530 changed |= BSS_CHANGED_QOS;
3531
3532 /*
3533 * If we haven't had a beacon before, tell the driver about the
3534 * DTIM period (and beacon timing if desired) now.
3535 */
3536 if (!ifmgd->have_beacon) {
3537 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3538 if (elems.tim)
3539 bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3540 else
3541 bss_conf->dtim_period = 1;
3542
3543 changed |= BSS_CHANGED_BEACON_INFO;
3544 ifmgd->have_beacon = true;
3545
3546 mutex_lock(&local->iflist_mtx);
3547 ieee80211_recalc_ps(local, -1);
3548 mutex_unlock(&local->iflist_mtx);
3549
3550 ieee80211_recalc_ps_vif(sdata);
3551 }
3552
3553 if (elems.erp_info) {
3554 erp_valid = true;
3555 erp_value = elems.erp_info[0];
3556 } else {
3557 erp_valid = false;
3558 }
3559 changed |= ieee80211_handle_bss_capability(sdata,
3560 le16_to_cpu(mgmt->u.beacon.capab_info),
3561 erp_valid, erp_value);
3562
3563 mutex_lock(&local->sta_mtx);
3564 sta = sta_info_get(sdata, bssid);
3565
3566 if (ieee80211_config_bw(sdata, sta,
3567 elems.ht_cap_elem, elems.ht_operation,
3568 elems.vht_operation, bssid, &changed)) {
3569 mutex_unlock(&local->sta_mtx);
3570 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3571 WLAN_REASON_DEAUTH_LEAVING,
3572 true, deauth_buf);
3573 ieee80211_report_disconnect(sdata, deauth_buf,
3574 sizeof(deauth_buf), true,
3575 WLAN_REASON_DEAUTH_LEAVING);
3576 return;
3577 }
3578
3579 if (sta && elems.opmode_notif)
3580 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3581 rx_status->band, true);
3582 mutex_unlock(&local->sta_mtx);
3583
3584 changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
3585 elems.country_elem,
3586 elems.country_elem_len,
3587 elems.pwr_constr_elem,
3588 elems.cisco_dtpc_elem);
3589
3590 ieee80211_bss_info_change_notify(sdata, changed);
3591 }
3592
3593 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3594 struct sk_buff *skb)
3595 {
3596 struct ieee80211_rx_status *rx_status;
3597 struct ieee80211_mgmt *mgmt;
3598 u16 fc;
3599 struct ieee802_11_elems elems;
3600 int ies_len;
3601
3602 rx_status = (struct ieee80211_rx_status *) skb->cb;
3603 mgmt = (struct ieee80211_mgmt *) skb->data;
3604 fc = le16_to_cpu(mgmt->frame_control);
3605
3606 sdata_lock(sdata);
3607
3608 switch (fc & IEEE80211_FCTL_STYPE) {
3609 case IEEE80211_STYPE_BEACON:
3610 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3611 break;
3612 case IEEE80211_STYPE_PROBE_RESP:
3613 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3614 break;
3615 case IEEE80211_STYPE_AUTH:
3616 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3617 break;
3618 case IEEE80211_STYPE_DEAUTH:
3619 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3620 break;
3621 case IEEE80211_STYPE_DISASSOC:
3622 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3623 break;
3624 case IEEE80211_STYPE_ASSOC_RESP:
3625 case IEEE80211_STYPE_REASSOC_RESP:
3626 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3627 break;
3628 case IEEE80211_STYPE_ACTION:
3629 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3630 ies_len = skb->len -
3631 offsetof(struct ieee80211_mgmt,
3632 u.action.u.chan_switch.variable);
3633
3634 if (ies_len < 0)
3635 break;
3636
3637 ieee802_11_parse_elems(
3638 mgmt->u.action.u.chan_switch.variable,
3639 ies_len, true, &elems);
3640
3641 if (elems.parse_error)
3642 break;
3643
3644 ieee80211_sta_process_chanswitch(sdata,
3645 rx_status->mactime,
3646 rx_status->device_timestamp,
3647 &elems, false);
3648 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3649 ies_len = skb->len -
3650 offsetof(struct ieee80211_mgmt,
3651 u.action.u.ext_chan_switch.variable);
3652
3653 if (ies_len < 0)
3654 break;
3655
3656 ieee802_11_parse_elems(
3657 mgmt->u.action.u.ext_chan_switch.variable,
3658 ies_len, true, &elems);
3659
3660 if (elems.parse_error)
3661 break;
3662
3663 /* for the handling code pretend this was also an IE */
3664 elems.ext_chansw_ie =
3665 &mgmt->u.action.u.ext_chan_switch.data;
3666
3667 ieee80211_sta_process_chanswitch(sdata,
3668 rx_status->mactime,
3669 rx_status->device_timestamp,
3670 &elems, false);
3671 }
3672 break;
3673 }
3674 sdata_unlock(sdata);
3675 }
3676
3677 static void ieee80211_sta_timer(unsigned long data)
3678 {
3679 struct ieee80211_sub_if_data *sdata =
3680 (struct ieee80211_sub_if_data *) data;
3681
3682 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3683 }
3684
3685 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3686 u8 *bssid, u8 reason, bool tx)
3687 {
3688 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3689
3690 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3691 tx, frame_buf);
3692
3693 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
3694 reason);
3695 }
3696
3697 static int ieee80211_auth(struct ieee80211_sub_if_data *sdata)
3698 {
3699 struct ieee80211_local *local = sdata->local;
3700 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3701 struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3702 u32 tx_flags = 0;
3703 u16 trans = 1;
3704 u16 status = 0;
3705
3706 sdata_assert_lock(sdata);
3707
3708 if (WARN_ON_ONCE(!auth_data))
3709 return -EINVAL;
3710
3711 auth_data->tries++;
3712
3713 if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3714 sdata_info(sdata, "authentication with %pM timed out\n",
3715 auth_data->bss->bssid);
3716
3717 /*
3718 * Most likely AP is not in the range so remove the
3719 * bss struct for that AP.
3720 */
3721 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3722
3723 return -ETIMEDOUT;
3724 }
3725
3726 drv_mgd_prepare_tx(local, sdata);
3727
3728 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3729 auth_data->bss->bssid, auth_data->tries,
3730 IEEE80211_AUTH_MAX_TRIES);
3731
3732 auth_data->expected_transaction = 2;
3733
3734 if (auth_data->algorithm == WLAN_AUTH_SAE) {
3735 trans = auth_data->sae_trans;
3736 status = auth_data->sae_status;
3737 auth_data->expected_transaction = trans;
3738 }
3739
3740 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3741 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3742 IEEE80211_TX_INTFL_MLME_CONN_TX;
3743
3744 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3745 auth_data->data, auth_data->data_len,
3746 auth_data->bss->bssid,
3747 auth_data->bss->bssid, NULL, 0, 0,
3748 tx_flags);
3749
3750 if (tx_flags == 0) {
3751 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3752 auth_data->timeout_started = true;
3753 run_again(sdata, auth_data->timeout);
3754 } else {
3755 auth_data->timeout =
3756 round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3757 auth_data->timeout_started = true;
3758 run_again(sdata, auth_data->timeout);
3759 }
3760
3761 return 0;
3762 }
3763
3764 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3765 {
3766 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3767 struct ieee80211_local *local = sdata->local;
3768
3769 sdata_assert_lock(sdata);
3770
3771 assoc_data->tries++;
3772 if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3773 sdata_info(sdata, "association with %pM timed out\n",
3774 assoc_data->bss->bssid);
3775
3776 /*
3777 * Most likely AP is not in the range so remove the
3778 * bss struct for that AP.
3779 */
3780 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3781
3782 return -ETIMEDOUT;
3783 }
3784
3785 sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3786 assoc_data->bss->bssid, assoc_data->tries,
3787 IEEE80211_ASSOC_MAX_TRIES);
3788 ieee80211_send_assoc(sdata);
3789
3790 if (!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3791 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3792 assoc_data->timeout_started = true;
3793 run_again(sdata, assoc_data->timeout);
3794 } else {
3795 assoc_data->timeout =
3796 round_jiffies_up(jiffies +
3797 IEEE80211_ASSOC_TIMEOUT_LONG);
3798 assoc_data->timeout_started = true;
3799 run_again(sdata, assoc_data->timeout);
3800 }
3801
3802 return 0;
3803 }
3804
3805 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3806 __le16 fc, bool acked)
3807 {
3808 struct ieee80211_local *local = sdata->local;
3809
3810 sdata->u.mgd.status_fc = fc;
3811 sdata->u.mgd.status_acked = acked;
3812 sdata->u.mgd.status_received = true;
3813
3814 ieee80211_queue_work(&local->hw, &sdata->work);
3815 }
3816
3817 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3818 {
3819 struct ieee80211_local *local = sdata->local;
3820 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3821
3822 sdata_lock(sdata);
3823
3824 if (ifmgd->status_received) {
3825 __le16 fc = ifmgd->status_fc;
3826 bool status_acked = ifmgd->status_acked;
3827
3828 ifmgd->status_received = false;
3829 if (ifmgd->auth_data && ieee80211_is_auth(fc)) {
3830 if (status_acked) {
3831 ifmgd->auth_data->timeout =
3832 jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3833 run_again(sdata, ifmgd->auth_data->timeout);
3834 } else {
3835 ifmgd->auth_data->timeout = jiffies - 1;
3836 }
3837 ifmgd->auth_data->timeout_started = true;
3838 } else if (ifmgd->assoc_data &&
3839 (ieee80211_is_assoc_req(fc) ||
3840 ieee80211_is_reassoc_req(fc))) {
3841 if (status_acked) {
3842 ifmgd->assoc_data->timeout =
3843 jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3844 run_again(sdata, ifmgd->assoc_data->timeout);
3845 } else {
3846 ifmgd->assoc_data->timeout = jiffies - 1;
3847 }
3848 ifmgd->assoc_data->timeout_started = true;
3849 }
3850 }
3851
3852 if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3853 time_after(jiffies, ifmgd->auth_data->timeout)) {
3854 if (ifmgd->auth_data->done) {
3855 /*
3856 * ok ... we waited for assoc but userspace didn't,
3857 * so let's just kill the auth data
3858 */
3859 ieee80211_destroy_auth_data(sdata, false);
3860 } else if (ieee80211_auth(sdata)) {
3861 u8 bssid[ETH_ALEN];
3862 struct ieee80211_event event = {
3863 .type = MLME_EVENT,
3864 .u.mlme.data = AUTH_EVENT,
3865 .u.mlme.status = MLME_TIMEOUT,
3866 };
3867
3868 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3869
3870 ieee80211_destroy_auth_data(sdata, false);
3871
3872 cfg80211_auth_timeout(sdata->dev, bssid);
3873 drv_event_callback(sdata->local, sdata, &event);
3874 }
3875 } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3876 run_again(sdata, ifmgd->auth_data->timeout);
3877
3878 if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3879 time_after(jiffies, ifmgd->assoc_data->timeout)) {
3880 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3881 ieee80211_do_assoc(sdata)) {
3882 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3883 struct ieee80211_event event = {
3884 .type = MLME_EVENT,
3885 .u.mlme.data = ASSOC_EVENT,
3886 .u.mlme.status = MLME_TIMEOUT,
3887 };
3888
3889 ieee80211_destroy_assoc_data(sdata, false);
3890 cfg80211_assoc_timeout(sdata->dev, bss);
3891 drv_event_callback(sdata->local, sdata, &event);
3892 }
3893 } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3894 run_again(sdata, ifmgd->assoc_data->timeout);
3895
3896 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3897 ifmgd->associated) {
3898 u8 bssid[ETH_ALEN];
3899 int max_tries;
3900
3901 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3902
3903 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3904 max_tries = max_nullfunc_tries;
3905 else
3906 max_tries = max_probe_tries;
3907
3908 /* ACK received for nullfunc probing frame */
3909 if (!ifmgd->probe_send_count)
3910 ieee80211_reset_ap_probe(sdata);
3911 else if (ifmgd->nullfunc_failed) {
3912 if (ifmgd->probe_send_count < max_tries) {
3913 mlme_dbg(sdata,
3914 "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3915 bssid, ifmgd->probe_send_count,
3916 max_tries);
3917 ieee80211_mgd_probe_ap_send(sdata);
3918 } else {
3919 mlme_dbg(sdata,
3920 "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3921 bssid);
3922 ieee80211_sta_connection_lost(sdata, bssid,
3923 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3924 false);
3925 }
3926 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3927 run_again(sdata, ifmgd->probe_timeout);
3928 else if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3929 mlme_dbg(sdata,
3930 "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3931 bssid, probe_wait_ms);
3932 ieee80211_sta_connection_lost(sdata, bssid,
3933 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3934 } else if (ifmgd->probe_send_count < max_tries) {
3935 mlme_dbg(sdata,
3936 "No probe response from AP %pM after %dms, try %d/%i\n",
3937 bssid, probe_wait_ms,
3938 ifmgd->probe_send_count, max_tries);
3939 ieee80211_mgd_probe_ap_send(sdata);
3940 } else {
3941 /*
3942 * We actually lost the connection ... or did we?
3943 * Let's make sure!
3944 */
3945 wiphy_debug(local->hw.wiphy,
3946 "%s: No probe response from AP %pM"
3947 " after %dms, disconnecting.\n",
3948 sdata->name,
3949 bssid, probe_wait_ms);
3950
3951 ieee80211_sta_connection_lost(sdata, bssid,
3952 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3953 }
3954 }
3955
3956 sdata_unlock(sdata);
3957 }
3958
3959 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3960 {
3961 struct ieee80211_sub_if_data *sdata =
3962 (struct ieee80211_sub_if_data *) data;
3963 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3964
3965 if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3966 return;
3967
3968 sdata->u.mgd.connection_loss = false;
3969 ieee80211_queue_work(&sdata->local->hw,
3970 &sdata->u.mgd.beacon_connection_loss_work);
3971 }
3972
3973 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3974 {
3975 struct ieee80211_sub_if_data *sdata =
3976 (struct ieee80211_sub_if_data *) data;
3977 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3978 struct ieee80211_local *local = sdata->local;
3979
3980 if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3981 return;
3982
3983 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3984 }
3985
3986 static void ieee80211_sta_monitor_work(struct work_struct *work)
3987 {
3988 struct ieee80211_sub_if_data *sdata =
3989 container_of(work, struct ieee80211_sub_if_data,
3990 u.mgd.monitor_work);
3991
3992 ieee80211_mgd_probe_ap(sdata, false);
3993 }
3994
3995 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3996 {
3997 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3998 __ieee80211_stop_poll(sdata);
3999
4000 /* let's probe the connection once */
4001 if (!ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
4002 ieee80211_queue_work(&sdata->local->hw,
4003 &sdata->u.mgd.monitor_work);
4004 /* and do all the other regular work too */
4005 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
4006 }
4007 }
4008
4009 #ifdef CONFIG_PM
4010 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
4011 {
4012 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4013 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4014
4015 sdata_lock(sdata);
4016
4017 if (ifmgd->auth_data || ifmgd->assoc_data) {
4018 const u8 *bssid = ifmgd->auth_data ?
4019 ifmgd->auth_data->bss->bssid :
4020 ifmgd->assoc_data->bss->bssid;
4021
4022 /*
4023 * If we are trying to authenticate / associate while suspending,
4024 * cfg80211 won't know and won't actually abort those attempts,
4025 * thus we need to do that ourselves.
4026 */
4027 ieee80211_send_deauth_disassoc(sdata, bssid,
4028 IEEE80211_STYPE_DEAUTH,
4029 WLAN_REASON_DEAUTH_LEAVING,
4030 false, frame_buf);
4031 if (ifmgd->assoc_data)
4032 ieee80211_destroy_assoc_data(sdata, false);
4033 if (ifmgd->auth_data)
4034 ieee80211_destroy_auth_data(sdata, false);
4035 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4036 IEEE80211_DEAUTH_FRAME_LEN);
4037 }
4038
4039 /* This is a bit of a hack - we should find a better and more generic
4040 * solution to this. Normally when suspending, cfg80211 will in fact
4041 * deauthenticate. However, it doesn't (and cannot) stop an ongoing
4042 * auth (not so important) or assoc (this is the problem) process.
4043 *
4044 * As a consequence, it can happen that we are in the process of both
4045 * associating and suspending, and receive an association response
4046 * after cfg80211 has checked if it needs to disconnect, but before
4047 * we actually set the flag to drop incoming frames. This will then
4048 * cause the workqueue flush to process the association response in
4049 * the suspend, resulting in a successful association just before it
4050 * tries to remove the interface from the driver, which now though
4051 * has a channel context assigned ... this results in issues.
4052 *
4053 * To work around this (for now) simply deauth here again if we're
4054 * now connected.
4055 */
4056 if (ifmgd->associated && !sdata->local->wowlan) {
4057 u8 bssid[ETH_ALEN];
4058 struct cfg80211_deauth_request req = {
4059 .reason_code = WLAN_REASON_DEAUTH_LEAVING,
4060 .bssid = bssid,
4061 };
4062
4063 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
4064 ieee80211_mgd_deauth(sdata, &req);
4065 }
4066
4067 sdata_unlock(sdata);
4068 }
4069
4070 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
4071 {
4072 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4073
4074 sdata_lock(sdata);
4075 if (!ifmgd->associated) {
4076 sdata_unlock(sdata);
4077 return;
4078 }
4079
4080 if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
4081 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
4082 mlme_dbg(sdata, "driver requested disconnect after resume\n");
4083 ieee80211_sta_connection_lost(sdata,
4084 ifmgd->associated->bssid,
4085 WLAN_REASON_UNSPECIFIED,
4086 true);
4087 sdata_unlock(sdata);
4088 return;
4089 }
4090 sdata_unlock(sdata);
4091 }
4092 #endif
4093
4094 /* interface setup */
4095 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
4096 {
4097 struct ieee80211_if_managed *ifmgd;
4098
4099 ifmgd = &sdata->u.mgd;
4100 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
4101 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
4102 INIT_WORK(&ifmgd->beacon_connection_loss_work,
4103 ieee80211_beacon_connection_loss_work);
4104 INIT_WORK(&ifmgd->csa_connection_drop_work,
4105 ieee80211_csa_connection_drop_work);
4106 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
4107 INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
4108 ieee80211_tdls_peer_del_work);
4109 setup_timer(&ifmgd->timer, ieee80211_sta_timer,
4110 (unsigned long) sdata);
4111 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
4112 (unsigned long) sdata);
4113 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
4114 (unsigned long) sdata);
4115 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
4116 (unsigned long) sdata);
4117 INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
4118 ieee80211_sta_handle_tspec_ac_params_wk);
4119
4120 ifmgd->flags = 0;
4121 ifmgd->powersave = sdata->wdev.ps;
4122 ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
4123 ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
4124 ifmgd->p2p_noa_index = -1;
4125
4126 if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4127 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
4128 else
4129 ifmgd->req_smps = IEEE80211_SMPS_OFF;
4130
4131 /* Setup TDLS data */
4132 spin_lock_init(&ifmgd->teardown_lock);
4133 ifmgd->teardown_skb = NULL;
4134 ifmgd->orig_teardown_skb = NULL;
4135 }
4136
4137 /* scan finished notification */
4138 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
4139 {
4140 struct ieee80211_sub_if_data *sdata;
4141
4142 /* Restart STA timers */
4143 rcu_read_lock();
4144 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4145 if (ieee80211_sdata_running(sdata))
4146 ieee80211_restart_sta_timer(sdata);
4147 }
4148 rcu_read_unlock();
4149 }
4150
4151 int ieee80211_max_network_latency(struct notifier_block *nb,
4152 unsigned long data, void *dummy)
4153 {
4154 s32 latency_usec = (s32) data;
4155 struct ieee80211_local *local =
4156 container_of(nb, struct ieee80211_local,
4157 network_latency_notifier);
4158
4159 mutex_lock(&local->iflist_mtx);
4160 ieee80211_recalc_ps(local, latency_usec);
4161 mutex_unlock(&local->iflist_mtx);
4162
4163 return NOTIFY_OK;
4164 }
4165
4166 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
4167 struct cfg80211_bss *cbss)
4168 {
4169 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4170 const u8 *ht_cap_ie, *vht_cap_ie;
4171 const struct ieee80211_ht_cap *ht_cap;
4172 const struct ieee80211_vht_cap *vht_cap;
4173 u8 chains = 1;
4174
4175 if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
4176 return chains;
4177
4178 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4179 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
4180 ht_cap = (void *)(ht_cap_ie + 2);
4181 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
4182 /*
4183 * TODO: use "Tx Maximum Number Spatial Streams Supported" and
4184 * "Tx Unequal Modulation Supported" fields.
4185 */
4186 }
4187
4188 if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
4189 return chains;
4190
4191 vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4192 if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
4193 u8 nss;
4194 u16 tx_mcs_map;
4195
4196 vht_cap = (void *)(vht_cap_ie + 2);
4197 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
4198 for (nss = 8; nss > 0; nss--) {
4199 if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
4200 IEEE80211_VHT_MCS_NOT_SUPPORTED)
4201 break;
4202 }
4203 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
4204 chains = max(chains, nss);
4205 }
4206
4207 return chains;
4208 }
4209
4210 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
4211 struct cfg80211_bss *cbss)
4212 {
4213 struct ieee80211_local *local = sdata->local;
4214 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4215 const struct ieee80211_ht_cap *ht_cap = NULL;
4216 const struct ieee80211_ht_operation *ht_oper = NULL;
4217 const struct ieee80211_vht_operation *vht_oper = NULL;
4218 struct ieee80211_supported_band *sband;
4219 struct cfg80211_chan_def chandef;
4220 int ret;
4221 u32 i;
4222 bool have_80mhz;
4223
4224 sband = local->hw.wiphy->bands[cbss->channel->band];
4225
4226 ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
4227 IEEE80211_STA_DISABLE_80P80MHZ |
4228 IEEE80211_STA_DISABLE_160MHZ);
4229
4230 rcu_read_lock();
4231
4232 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
4233 sband->ht_cap.ht_supported) {
4234 const u8 *ht_oper_ie, *ht_cap_ie;
4235
4236 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4237 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
4238 ht_oper = (void *)(ht_oper_ie + 2);
4239
4240 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4241 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
4242 ht_cap = (void *)(ht_cap_ie + 2);
4243
4244 if (!ht_cap) {
4245 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4246 ht_oper = NULL;
4247 }
4248 }
4249
4250 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4251 sband->vht_cap.vht_supported) {
4252 const u8 *vht_oper_ie, *vht_cap;
4253
4254 vht_oper_ie = ieee80211_bss_get_ie(cbss,
4255 WLAN_EID_VHT_OPERATION);
4256 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
4257 vht_oper = (void *)(vht_oper_ie + 2);
4258 if (vht_oper && !ht_oper) {
4259 vht_oper = NULL;
4260 sdata_info(sdata,
4261 "AP advertised VHT without HT, disabling both\n");
4262 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4263 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4264 }
4265
4266 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4267 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
4268 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4269 vht_oper = NULL;
4270 }
4271 }
4272
4273 /* Allow VHT if at least one channel on the sband supports 80 MHz */
4274 have_80mhz = false;
4275 for (i = 0; i < sband->n_channels; i++) {
4276 if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
4277 IEEE80211_CHAN_NO_80MHZ))
4278 continue;
4279
4280 have_80mhz = true;
4281 break;
4282 }
4283
4284 if (!have_80mhz)
4285 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4286
4287 ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
4288 cbss->channel,
4289 ht_cap, ht_oper, vht_oper,
4290 &chandef, false);
4291
4292 sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
4293 local->rx_chains);
4294
4295 rcu_read_unlock();
4296
4297 /* will change later if needed */
4298 sdata->smps_mode = IEEE80211_SMPS_OFF;
4299
4300 mutex_lock(&local->mtx);
4301 /*
4302 * If this fails (possibly due to channel context sharing
4303 * on incompatible channels, e.g. 80+80 and 160 sharing the
4304 * same control channel) try to use a smaller bandwidth.
4305 */
4306 ret = ieee80211_vif_use_channel(sdata, &chandef,
4307 IEEE80211_CHANCTX_SHARED);
4308
4309 /* don't downgrade for 5 and 10 MHz channels, though. */
4310 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
4311 chandef.width == NL80211_CHAN_WIDTH_10)
4312 goto out;
4313
4314 while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4315 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4316 ret = ieee80211_vif_use_channel(sdata, &chandef,
4317 IEEE80211_CHANCTX_SHARED);
4318 }
4319 out:
4320 mutex_unlock(&local->mtx);
4321 return ret;
4322 }
4323
4324 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4325 struct cfg80211_bss *cbss, bool assoc,
4326 bool override)
4327 {
4328 struct ieee80211_local *local = sdata->local;
4329 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4330 struct ieee80211_bss *bss = (void *)cbss->priv;
4331 struct sta_info *new_sta = NULL;
4332 struct ieee80211_supported_band *sband;
4333 bool have_sta = false;
4334 int err;
4335
4336 sband = local->hw.wiphy->bands[cbss->channel->band];
4337
4338 if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
4339 return -EINVAL;
4340
4341 if (assoc) {
4342 rcu_read_lock();
4343 have_sta = sta_info_get(sdata, cbss->bssid);
4344 rcu_read_unlock();
4345 }
4346
4347 if (!have_sta) {
4348 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
4349 if (!new_sta)
4350 return -ENOMEM;
4351 }
4352
4353 if (new_sta || override) {
4354 err = ieee80211_prep_channel(sdata, cbss);
4355 if (err) {
4356 if (new_sta)
4357 sta_info_free(local, new_sta);
4358 return -EINVAL;
4359 }
4360 }
4361
4362 if (new_sta) {
4363 u32 rates = 0, basic_rates = 0;
4364 bool have_higher_than_11mbit;
4365 int min_rate = INT_MAX, min_rate_index = -1;
4366 struct ieee80211_chanctx_conf *chanctx_conf;
4367 const struct cfg80211_bss_ies *ies;
4368 int shift = ieee80211_vif_get_shift(&sdata->vif);
4369 u32 rate_flags;
4370
4371 rcu_read_lock();
4372 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4373 if (WARN_ON(!chanctx_conf)) {
4374 rcu_read_unlock();
4375 sta_info_free(local, new_sta);
4376 return -EINVAL;
4377 }
4378 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
4379 rcu_read_unlock();
4380
4381 ieee80211_get_rates(sband, bss->supp_rates,
4382 bss->supp_rates_len,
4383 &rates, &basic_rates,
4384 &have_higher_than_11mbit,
4385 &min_rate, &min_rate_index,
4386 shift, rate_flags);
4387
4388 /*
4389 * This used to be a workaround for basic rates missing
4390 * in the association response frame. Now that we no
4391 * longer use the basic rates from there, it probably
4392 * doesn't happen any more, but keep the workaround so
4393 * in case some *other* APs are buggy in different ways
4394 * we can connect -- with a warning.
4395 */
4396 if (!basic_rates && min_rate_index >= 0) {
4397 sdata_info(sdata,
4398 "No basic rates, using min rate instead\n");
4399 basic_rates = BIT(min_rate_index);
4400 }
4401
4402 new_sta->sta.supp_rates[cbss->channel->band] = rates;
4403 sdata->vif.bss_conf.basic_rates = basic_rates;
4404
4405 /* cf. IEEE 802.11 9.2.12 */
4406 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
4407 have_higher_than_11mbit)
4408 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
4409 else
4410 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
4411
4412 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
4413
4414 /* set timing information */
4415 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
4416 rcu_read_lock();
4417 ies = rcu_dereference(cbss->beacon_ies);
4418 if (ies) {
4419 const u8 *tim_ie;
4420
4421 sdata->vif.bss_conf.sync_tsf = ies->tsf;
4422 sdata->vif.bss_conf.sync_device_ts =
4423 bss->device_ts_beacon;
4424 tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4425 ies->data, ies->len);
4426 if (tim_ie && tim_ie[1] >= 2)
4427 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
4428 else
4429 sdata->vif.bss_conf.sync_dtim_count = 0;
4430 } else if (!ieee80211_hw_check(&sdata->local->hw,
4431 TIMING_BEACON_ONLY)) {
4432 ies = rcu_dereference(cbss->proberesp_ies);
4433 /* must be non-NULL since beacon IEs were NULL */
4434 sdata->vif.bss_conf.sync_tsf = ies->tsf;
4435 sdata->vif.bss_conf.sync_device_ts =
4436 bss->device_ts_presp;
4437 sdata->vif.bss_conf.sync_dtim_count = 0;
4438 } else {
4439 sdata->vif.bss_conf.sync_tsf = 0;
4440 sdata->vif.bss_conf.sync_device_ts = 0;
4441 sdata->vif.bss_conf.sync_dtim_count = 0;
4442 }
4443 rcu_read_unlock();
4444
4445 /* tell driver about BSSID, basic rates and timing */
4446 ieee80211_bss_info_change_notify(sdata,
4447 BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4448 BSS_CHANGED_BEACON_INT);
4449
4450 if (assoc)
4451 sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4452
4453 err = sta_info_insert(new_sta);
4454 new_sta = NULL;
4455 if (err) {
4456 sdata_info(sdata,
4457 "failed to insert STA entry for the AP (error %d)\n",
4458 err);
4459 return err;
4460 }
4461 } else
4462 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4463
4464 /* Cancel scan to ensure that nothing interferes with connection */
4465 if (local->scanning)
4466 ieee80211_scan_cancel(local);
4467
4468 return 0;
4469 }
4470
4471 /* config hooks */
4472 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4473 struct cfg80211_auth_request *req)
4474 {
4475 struct ieee80211_local *local = sdata->local;
4476 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4477 struct ieee80211_mgd_auth_data *auth_data;
4478 u16 auth_alg;
4479 int err;
4480
4481 /* prepare auth data structure */
4482
4483 switch (req->auth_type) {
4484 case NL80211_AUTHTYPE_OPEN_SYSTEM:
4485 auth_alg = WLAN_AUTH_OPEN;
4486 break;
4487 case NL80211_AUTHTYPE_SHARED_KEY:
4488 if (IS_ERR(local->wep_tx_tfm))
4489 return -EOPNOTSUPP;
4490 auth_alg = WLAN_AUTH_SHARED_KEY;
4491 break;
4492 case NL80211_AUTHTYPE_FT:
4493 auth_alg = WLAN_AUTH_FT;
4494 break;
4495 case NL80211_AUTHTYPE_NETWORK_EAP:
4496 auth_alg = WLAN_AUTH_LEAP;
4497 break;
4498 case NL80211_AUTHTYPE_SAE:
4499 auth_alg = WLAN_AUTH_SAE;
4500 break;
4501 default:
4502 return -EOPNOTSUPP;
4503 }
4504
4505 auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
4506 req->ie_len, GFP_KERNEL);
4507 if (!auth_data)
4508 return -ENOMEM;
4509
4510 auth_data->bss = req->bss;
4511
4512 if (req->sae_data_len >= 4) {
4513 __le16 *pos = (__le16 *) req->sae_data;
4514 auth_data->sae_trans = le16_to_cpu(pos[0]);
4515 auth_data->sae_status = le16_to_cpu(pos[1]);
4516 memcpy(auth_data->data, req->sae_data + 4,
4517 req->sae_data_len - 4);
4518 auth_data->data_len += req->sae_data_len - 4;
4519 }
4520
4521 if (req->ie && req->ie_len) {
4522 memcpy(&auth_data->data[auth_data->data_len],
4523 req->ie, req->ie_len);
4524 auth_data->data_len += req->ie_len;
4525 }
4526
4527 if (req->key && req->key_len) {
4528 auth_data->key_len = req->key_len;
4529 auth_data->key_idx = req->key_idx;
4530 memcpy(auth_data->key, req->key, req->key_len);
4531 }
4532
4533 auth_data->algorithm = auth_alg;
4534
4535 /* try to authenticate/probe */
4536
4537 if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4538 ifmgd->assoc_data) {
4539 err = -EBUSY;
4540 goto err_free;
4541 }
4542
4543 if (ifmgd->auth_data)
4544 ieee80211_destroy_auth_data(sdata, false);
4545
4546 /* prep auth_data so we don't go into idle on disassoc */
4547 ifmgd->auth_data = auth_data;
4548
4549 if (ifmgd->associated) {
4550 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4551
4552 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4553 WLAN_REASON_UNSPECIFIED,
4554 false, frame_buf);
4555
4556 ieee80211_report_disconnect(sdata, frame_buf,
4557 sizeof(frame_buf), true,
4558 WLAN_REASON_UNSPECIFIED);
4559 }
4560
4561 sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4562
4563 err = ieee80211_prep_connection(sdata, req->bss, false, false);
4564 if (err)
4565 goto err_clear;
4566
4567 err = ieee80211_auth(sdata);
4568 if (err) {
4569 sta_info_destroy_addr(sdata, req->bss->bssid);
4570 goto err_clear;
4571 }
4572
4573 /* hold our own reference */
4574 cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4575 return 0;
4576
4577 err_clear:
4578 eth_zero_addr(ifmgd->bssid);
4579 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4580 ifmgd->auth_data = NULL;
4581 mutex_lock(&sdata->local->mtx);
4582 ieee80211_vif_release_channel(sdata);
4583 mutex_unlock(&sdata->local->mtx);
4584 err_free:
4585 kfree(auth_data);
4586 return err;
4587 }
4588
4589 static bool ieee80211_usable_wmm_params(struct ieee80211_sub_if_data *sdata,
4590 const u8 *wmm_param, int len)
4591 {
4592 const u8 *pos;
4593 size_t left;
4594
4595 if (len < 8)
4596 return false;
4597
4598 if (wmm_param[5] != 1 /* version */)
4599 return false;
4600
4601 pos = wmm_param + 8;
4602 left = len - 8;
4603
4604 for (; left >= 4; left -= 4, pos += 4) {
4605 u8 aifsn = pos[0] & 0x0f;
4606 u8 ecwmin = pos[1] & 0x0f;
4607 u8 ecwmax = (pos[1] & 0xf0) >> 4;
4608 int aci = (pos[0] >> 5) & 0x03;
4609
4610 if (aifsn < 2) {
4611 sdata_info(sdata,
4612 "AP has invalid WMM params (AIFSN=%d for ACI %d), disabling WMM\n",
4613 aifsn, aci);
4614 return false;
4615 }
4616 if (ecwmin > ecwmax) {
4617 sdata_info(sdata,
4618 "AP has invalid WMM params (ECWmin/max=%d/%d for ACI %d), disabling WMM\n",
4619 ecwmin, ecwmax, aci);
4620 return false;
4621 }
4622 }
4623
4624 return true;
4625 }
4626
4627 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4628 struct cfg80211_assoc_request *req)
4629 {
4630 struct ieee80211_local *local = sdata->local;
4631 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4632 struct ieee80211_bss *bss = (void *)req->bss->priv;
4633 struct ieee80211_mgd_assoc_data *assoc_data;
4634 const struct cfg80211_bss_ies *beacon_ies;
4635 struct ieee80211_supported_band *sband;
4636 const u8 *ssidie, *ht_ie, *vht_ie;
4637 int i, err;
4638 bool override = false;
4639
4640 assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4641 if (!assoc_data)
4642 return -ENOMEM;
4643
4644 rcu_read_lock();
4645 ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4646 if (!ssidie) {
4647 rcu_read_unlock();
4648 kfree(assoc_data);
4649 return -EINVAL;
4650 }
4651 memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4652 assoc_data->ssid_len = ssidie[1];
4653 rcu_read_unlock();
4654
4655 if (ifmgd->associated) {
4656 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4657
4658 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4659 WLAN_REASON_UNSPECIFIED,
4660 false, frame_buf);
4661
4662 ieee80211_report_disconnect(sdata, frame_buf,
4663 sizeof(frame_buf), true,
4664 WLAN_REASON_UNSPECIFIED);
4665 }
4666
4667 if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4668 err = -EBUSY;
4669 goto err_free;
4670 }
4671
4672 if (ifmgd->assoc_data) {
4673 err = -EBUSY;
4674 goto err_free;
4675 }
4676
4677 if (ifmgd->auth_data) {
4678 bool match;
4679
4680 /* keep sta info, bssid if matching */
4681 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4682 ieee80211_destroy_auth_data(sdata, match);
4683 }
4684
4685 /* prepare assoc data */
4686
4687 ifmgd->beacon_crc_valid = false;
4688
4689 assoc_data->wmm = bss->wmm_used &&
4690 (local->hw.queues >= IEEE80211_NUM_ACS);
4691 if (assoc_data->wmm) {
4692 /* try to check validity of WMM params IE */
4693 const struct cfg80211_bss_ies *ies;
4694 const u8 *wp, *start, *end;
4695
4696 rcu_read_lock();
4697 ies = rcu_dereference(req->bss->ies);
4698 start = ies->data;
4699 end = start + ies->len;
4700
4701 while (true) {
4702 wp = cfg80211_find_vendor_ie(
4703 WLAN_OUI_MICROSOFT,
4704 WLAN_OUI_TYPE_MICROSOFT_WMM,
4705 start, end - start);
4706 if (!wp)
4707 break;
4708 start = wp + wp[1] + 2;
4709 /* if this IE is too short, try the next */
4710 if (wp[1] <= 4)
4711 continue;
4712 /* if this IE is WMM params, we found what we wanted */
4713 if (wp[6] == 1)
4714 break;
4715 }
4716
4717 if (!wp || !ieee80211_usable_wmm_params(sdata, wp + 2,
4718 wp[1] - 2)) {
4719 assoc_data->wmm = false;
4720 ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
4721 }
4722 rcu_read_unlock();
4723 }
4724
4725 /*
4726 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4727 * We still associate in non-HT mode (11a/b/g) if any one of these
4728 * ciphers is configured as pairwise.
4729 * We can set this to true for non-11n hardware, that'll be checked
4730 * separately along with the peer capabilities.
4731 */
4732 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4733 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4734 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4735 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4736 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4737 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4738 netdev_info(sdata->dev,
4739 "disabling HT/VHT due to WEP/TKIP use\n");
4740 }
4741 }
4742
4743 /* Also disable HT if we don't support it or the AP doesn't use WMM */
4744 sband = local->hw.wiphy->bands[req->bss->channel->band];
4745 if (!sband->ht_cap.ht_supported ||
4746 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4747 ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4748 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4749 if (!bss->wmm_used &&
4750 !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4751 netdev_info(sdata->dev,
4752 "disabling HT as WMM/QoS is not supported by the AP\n");
4753 }
4754
4755 /* disable VHT if we don't support it or the AP doesn't use WMM */
4756 if (!sband->vht_cap.vht_supported ||
4757 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4758 ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4759 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4760 if (!bss->wmm_used &&
4761 !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4762 netdev_info(sdata->dev,
4763 "disabling VHT as WMM/QoS is not supported by the AP\n");
4764 }
4765
4766 memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4767 memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4768 sizeof(ifmgd->ht_capa_mask));
4769
4770 memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4771 memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4772 sizeof(ifmgd->vht_capa_mask));
4773
4774 if (req->ie && req->ie_len) {
4775 memcpy(assoc_data->ie, req->ie, req->ie_len);
4776 assoc_data->ie_len = req->ie_len;
4777 }
4778
4779 assoc_data->bss = req->bss;
4780
4781 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4782 if (ifmgd->powersave)
4783 sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4784 else
4785 sdata->smps_mode = IEEE80211_SMPS_OFF;
4786 } else
4787 sdata->smps_mode = ifmgd->req_smps;
4788
4789 assoc_data->capability = req->bss->capability;
4790 assoc_data->supp_rates = bss->supp_rates;
4791 assoc_data->supp_rates_len = bss->supp_rates_len;
4792
4793 rcu_read_lock();
4794 ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4795 if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4796 assoc_data->ap_ht_param =
4797 ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4798 else
4799 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4800 vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4801 if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4802 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4803 sizeof(struct ieee80211_vht_cap));
4804 else
4805 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4806 rcu_read_unlock();
4807
4808 if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) &&
4809 ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK),
4810 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"))
4811 sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;
4812
4813 if (bss->wmm_used && bss->uapsd_supported &&
4814 (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) {
4815 assoc_data->uapsd = true;
4816 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4817 } else {
4818 assoc_data->uapsd = false;
4819 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4820 }
4821
4822 if (req->prev_bssid)
4823 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4824
4825 if (req->use_mfp) {
4826 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4827 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4828 } else {
4829 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4830 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4831 }
4832
4833 if (req->flags & ASSOC_REQ_USE_RRM)
4834 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
4835 else
4836 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;
4837
4838 if (req->crypto.control_port)
4839 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4840 else
4841 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4842
4843 sdata->control_port_protocol = req->crypto.control_port_ethertype;
4844 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4845 sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4846 sdata->vif.type);
4847
4848 /* kick off associate process */
4849
4850 ifmgd->assoc_data = assoc_data;
4851 ifmgd->dtim_period = 0;
4852 ifmgd->have_beacon = false;
4853
4854 /* override HT/VHT configuration only if the AP and we support it */
4855 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
4856 struct ieee80211_sta_ht_cap sta_ht_cap;
4857
4858 if (req->flags & ASSOC_REQ_DISABLE_HT)
4859 override = true;
4860
4861 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
4862 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
4863
4864 /* check for 40 MHz disable override */
4865 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ) &&
4866 sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
4867 !(sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
4868 override = true;
4869
4870 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4871 req->flags & ASSOC_REQ_DISABLE_VHT)
4872 override = true;
4873 }
4874
4875 if (req->flags & ASSOC_REQ_DISABLE_HT) {
4876 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4877 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4878 }
4879
4880 if (req->flags & ASSOC_REQ_DISABLE_VHT)
4881 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4882
4883 err = ieee80211_prep_connection(sdata, req->bss, true, override);
4884 if (err)
4885 goto err_clear;
4886
4887 rcu_read_lock();
4888 beacon_ies = rcu_dereference(req->bss->beacon_ies);
4889
4890 if (ieee80211_hw_check(&sdata->local->hw, NEED_DTIM_BEFORE_ASSOC) &&
4891 !beacon_ies) {
4892 /*
4893 * Wait up to one beacon interval ...
4894 * should this be more if we miss one?
4895 */
4896 sdata_info(sdata, "waiting for beacon from %pM\n",
4897 ifmgd->bssid);
4898 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4899 assoc_data->timeout_started = true;
4900 assoc_data->need_beacon = true;
4901 } else if (beacon_ies) {
4902 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4903 beacon_ies->data,
4904 beacon_ies->len);
4905 u8 dtim_count = 0;
4906
4907 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4908 const struct ieee80211_tim_ie *tim;
4909 tim = (void *)(tim_ie + 2);
4910 ifmgd->dtim_period = tim->dtim_period;
4911 dtim_count = tim->dtim_count;
4912 }
4913 ifmgd->have_beacon = true;
4914 assoc_data->timeout = jiffies;
4915 assoc_data->timeout_started = true;
4916
4917 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
4918 sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4919 sdata->vif.bss_conf.sync_device_ts =
4920 bss->device_ts_beacon;
4921 sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4922 }
4923 } else {
4924 assoc_data->timeout = jiffies;
4925 assoc_data->timeout_started = true;
4926 }
4927 rcu_read_unlock();
4928
4929 run_again(sdata, assoc_data->timeout);
4930
4931 if (bss->corrupt_data) {
4932 char *corrupt_type = "data";
4933 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4934 if (bss->corrupt_data &
4935 IEEE80211_BSS_CORRUPT_PROBE_RESP)
4936 corrupt_type = "beacon and probe response";
4937 else
4938 corrupt_type = "beacon";
4939 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4940 corrupt_type = "probe response";
4941 sdata_info(sdata, "associating with AP with corrupt %s\n",
4942 corrupt_type);
4943 }
4944
4945 return 0;
4946 err_clear:
4947 eth_zero_addr(ifmgd->bssid);
4948 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4949 ifmgd->assoc_data = NULL;
4950 err_free:
4951 kfree(assoc_data);
4952 return err;
4953 }
4954
4955 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4956 struct cfg80211_deauth_request *req)
4957 {
4958 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4959 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4960 bool tx = !req->local_state_change;
4961
4962 if (ifmgd->auth_data &&
4963 ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
4964 sdata_info(sdata,
4965 "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
4966 req->bssid, req->reason_code,
4967 ieee80211_get_reason_code_string(req->reason_code));
4968
4969 drv_mgd_prepare_tx(sdata->local, sdata);
4970 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4971 IEEE80211_STYPE_DEAUTH,
4972 req->reason_code, tx,
4973 frame_buf);
4974 ieee80211_destroy_auth_data(sdata, false);
4975 ieee80211_report_disconnect(sdata, frame_buf,
4976 sizeof(frame_buf), true,
4977 req->reason_code);
4978
4979 return 0;
4980 }
4981
4982 if (ifmgd->associated &&
4983 ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4984 sdata_info(sdata,
4985 "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
4986 req->bssid, req->reason_code,
4987 ieee80211_get_reason_code_string(req->reason_code));
4988
4989 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4990 req->reason_code, tx, frame_buf);
4991 ieee80211_report_disconnect(sdata, frame_buf,
4992 sizeof(frame_buf), true,
4993 req->reason_code);
4994 return 0;
4995 }
4996
4997 return -ENOTCONN;
4998 }
4999
5000 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
5001 struct cfg80211_disassoc_request *req)
5002 {
5003 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5004 u8 bssid[ETH_ALEN];
5005 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
5006
5007 /*
5008 * cfg80211 should catch this ... but it's racy since
5009 * we can receive a disassoc frame, process it, hand it
5010 * to cfg80211 while that's in a locked section already
5011 * trying to tell us that the user wants to disconnect.
5012 */
5013 if (ifmgd->associated != req->bss)
5014 return -ENOLINK;
5015
5016 sdata_info(sdata,
5017 "disassociating from %pM by local choice (Reason: %u=%s)\n",
5018 req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
5019
5020 memcpy(bssid, req->bss->bssid, ETH_ALEN);
5021 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
5022 req->reason_code, !req->local_state_change,
5023 frame_buf);
5024
5025 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
5026 req->reason_code);
5027
5028 return 0;
5029 }
5030
5031 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
5032 {
5033 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5034
5035 /*
5036 * Make sure some work items will not run after this,
5037 * they will not do anything but might not have been
5038 * cancelled when disconnecting.
5039 */
5040 cancel_work_sync(&ifmgd->monitor_work);
5041 cancel_work_sync(&ifmgd->beacon_connection_loss_work);
5042 cancel_work_sync(&ifmgd->request_smps_work);
5043 cancel_work_sync(&ifmgd->csa_connection_drop_work);
5044 cancel_work_sync(&ifmgd->chswitch_work);
5045 cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
5046
5047 sdata_lock(sdata);
5048 if (ifmgd->assoc_data) {
5049 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
5050 ieee80211_destroy_assoc_data(sdata, false);
5051 cfg80211_assoc_timeout(sdata->dev, bss);
5052 }
5053 if (ifmgd->auth_data)
5054 ieee80211_destroy_auth_data(sdata, false);
5055 spin_lock_bh(&ifmgd->teardown_lock);
5056 if (ifmgd->teardown_skb) {
5057 kfree_skb(ifmgd->teardown_skb);
5058 ifmgd->teardown_skb = NULL;
5059 ifmgd->orig_teardown_skb = NULL;
5060 }
5061 spin_unlock_bh(&ifmgd->teardown_lock);
5062 del_timer_sync(&ifmgd->timer);
5063 sdata_unlock(sdata);
5064 }
5065
5066 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
5067 enum nl80211_cqm_rssi_threshold_event rssi_event,
5068 gfp_t gfp)
5069 {
5070 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5071
5072 trace_api_cqm_rssi_notify(sdata, rssi_event);
5073
5074 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
5075 }
5076 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
5077
5078 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp)
5079 {
5080 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5081
5082 trace_api_cqm_beacon_loss_notify(sdata->local, sdata);
5083
5084 cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp);
5085 }
5086 EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify);
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