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mac80211: add a HW flag for supporting HW TX fragmentation
[mirror_ubuntu-bionic-kernel.git] / net / mac80211 / mlme.c
1 /*
2 * BSS client mode implementation
3 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4 * Copyright 2004, Instant802 Networks, Inc.
5 * Copyright 2005, Devicescape Software, Inc.
6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8 * Copyright 2013-2014 Intel Mobile Communications GmbH
9 * Copyright (C) 2015 - 2016 Intel Deutschland GmbH
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 */
15
16 #include <linux/delay.h>
17 #include <linux/if_ether.h>
18 #include <linux/skbuff.h>
19 #include <linux/if_arp.h>
20 #include <linux/etherdevice.h>
21 #include <linux/moduleparam.h>
22 #include <linux/rtnetlink.h>
23 #include <linux/crc32.h>
24 #include <linux/slab.h>
25 #include <linux/export.h>
26 #include <net/mac80211.h>
27 #include <asm/unaligned.h>
28
29 #include "ieee80211_i.h"
30 #include "driver-ops.h"
31 #include "rate.h"
32 #include "led.h"
33
34 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
35 #define IEEE80211_AUTH_TIMEOUT_LONG (HZ / 2)
36 #define IEEE80211_AUTH_TIMEOUT_SHORT (HZ / 10)
37 #define IEEE80211_AUTH_MAX_TRIES 3
38 #define IEEE80211_AUTH_WAIT_ASSOC (HZ * 5)
39 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
40 #define IEEE80211_ASSOC_TIMEOUT_LONG (HZ / 2)
41 #define IEEE80211_ASSOC_TIMEOUT_SHORT (HZ / 10)
42 #define IEEE80211_ASSOC_MAX_TRIES 3
43
44 static int max_nullfunc_tries = 2;
45 module_param(max_nullfunc_tries, int, 0644);
46 MODULE_PARM_DESC(max_nullfunc_tries,
47 "Maximum nullfunc tx tries before disconnecting (reason 4).");
48
49 static int max_probe_tries = 5;
50 module_param(max_probe_tries, int, 0644);
51 MODULE_PARM_DESC(max_probe_tries,
52 "Maximum probe tries before disconnecting (reason 4).");
53
54 /*
55 * Beacon loss timeout is calculated as N frames times the
56 * advertised beacon interval. This may need to be somewhat
57 * higher than what hardware might detect to account for
58 * delays in the host processing frames. But since we also
59 * probe on beacon miss before declaring the connection lost
60 * default to what we want.
61 */
62 static int beacon_loss_count = 7;
63 module_param(beacon_loss_count, int, 0644);
64 MODULE_PARM_DESC(beacon_loss_count,
65 "Number of beacon intervals before we decide beacon was lost.");
66
67 /*
68 * Time the connection can be idle before we probe
69 * it to see if we can still talk to the AP.
70 */
71 #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ)
72 /*
73 * Time we wait for a probe response after sending
74 * a probe request because of beacon loss or for
75 * checking the connection still works.
76 */
77 static int probe_wait_ms = 500;
78 module_param(probe_wait_ms, int, 0644);
79 MODULE_PARM_DESC(probe_wait_ms,
80 "Maximum time(ms) to wait for probe response"
81 " before disconnecting (reason 4).");
82
83 /*
84 * How many Beacon frames need to have been used in average signal strength
85 * before starting to indicate signal change events.
86 */
87 #define IEEE80211_SIGNAL_AVE_MIN_COUNT 4
88
89 /*
90 * We can have multiple work items (and connection probing)
91 * scheduling this timer, but we need to take care to only
92 * reschedule it when it should fire _earlier_ than it was
93 * asked for before, or if it's not pending right now. This
94 * function ensures that. Note that it then is required to
95 * run this function for all timeouts after the first one
96 * has happened -- the work that runs from this timer will
97 * do that.
98 */
99 static void run_again(struct ieee80211_sub_if_data *sdata,
100 unsigned long timeout)
101 {
102 sdata_assert_lock(sdata);
103
104 if (!timer_pending(&sdata->u.mgd.timer) ||
105 time_before(timeout, sdata->u.mgd.timer.expires))
106 mod_timer(&sdata->u.mgd.timer, timeout);
107 }
108
109 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
110 {
111 if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
112 return;
113
114 if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
115 return;
116
117 mod_timer(&sdata->u.mgd.bcn_mon_timer,
118 round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
119 }
120
121 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
122 {
123 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
124
125 if (unlikely(!ifmgd->associated))
126 return;
127
128 if (ifmgd->probe_send_count)
129 ifmgd->probe_send_count = 0;
130
131 if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
132 return;
133
134 mod_timer(&ifmgd->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 ieee80211_chandef_ht_oper(ht_oper, chandef);
201 } else {
202 /* 40 MHz (and 80 MHz) must be supported for VHT */
203 ret = IEEE80211_STA_DISABLE_VHT;
204 /* also mark 40 MHz disabled */
205 ret |= IEEE80211_STA_DISABLE_40MHZ;
206 goto out;
207 }
208
209 if (!vht_oper || !sband->vht_cap.vht_supported) {
210 ret = IEEE80211_STA_DISABLE_VHT;
211 goto out;
212 }
213
214 vht_chandef = *chandef;
215 if (!ieee80211_chandef_vht_oper(vht_oper, &vht_chandef)) {
216 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
217 sdata_info(sdata,
218 "AP VHT information is invalid, disable VHT\n");
219 ret = IEEE80211_STA_DISABLE_VHT;
220 goto out;
221 }
222
223 if (!cfg80211_chandef_valid(&vht_chandef)) {
224 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
225 sdata_info(sdata,
226 "AP VHT information is invalid, disable VHT\n");
227 ret = IEEE80211_STA_DISABLE_VHT;
228 goto out;
229 }
230
231 if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
232 ret = 0;
233 goto out;
234 }
235
236 if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
237 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
238 sdata_info(sdata,
239 "AP VHT information doesn't match HT, disable VHT\n");
240 ret = IEEE80211_STA_DISABLE_VHT;
241 goto out;
242 }
243
244 *chandef = vht_chandef;
245
246 ret = 0;
247
248 out:
249 /*
250 * When tracking the current AP, don't do any further checks if the
251 * new chandef is identical to the one we're currently using for the
252 * connection. This keeps us from playing ping-pong with regulatory,
253 * without it the following can happen (for example):
254 * - connect to an AP with 80 MHz, world regdom allows 80 MHz
255 * - AP advertises regdom US
256 * - CRDA loads regdom US with 80 MHz prohibited (old database)
257 * - the code below detects an unsupported channel, downgrades, and
258 * we disconnect from the AP in the caller
259 * - disconnect causes CRDA to reload world regdomain and the game
260 * starts anew.
261 * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
262 *
263 * It seems possible that there are still scenarios with CSA or real
264 * bandwidth changes where a this could happen, but those cases are
265 * less common and wouldn't completely prevent using the AP.
266 */
267 if (tracking &&
268 cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
269 return ret;
270
271 /* don't print the message below for VHT mismatch if VHT is disabled */
272 if (ret & IEEE80211_STA_DISABLE_VHT)
273 vht_chandef = *chandef;
274
275 /*
276 * Ignore the DISABLED flag when we're already connected and only
277 * tracking the APs beacon for bandwidth changes - otherwise we
278 * might get disconnected here if we connect to an AP, update our
279 * regulatory information based on the AP's country IE and the
280 * information we have is wrong/outdated and disables the channel
281 * that we're actually using for the connection to the AP.
282 */
283 while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
284 tracking ? 0 :
285 IEEE80211_CHAN_DISABLED)) {
286 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
287 ret = IEEE80211_STA_DISABLE_HT |
288 IEEE80211_STA_DISABLE_VHT;
289 break;
290 }
291
292 ret |= ieee80211_chandef_downgrade(chandef);
293 }
294
295 if (chandef->width != vht_chandef.width && !tracking)
296 sdata_info(sdata,
297 "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
298
299 WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
300 return ret;
301 }
302
303 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
304 struct sta_info *sta,
305 const struct ieee80211_ht_cap *ht_cap,
306 const struct ieee80211_ht_operation *ht_oper,
307 const struct ieee80211_vht_operation *vht_oper,
308 const u8 *bssid, u32 *changed)
309 {
310 struct ieee80211_local *local = sdata->local;
311 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
312 struct ieee80211_supported_band *sband;
313 struct ieee80211_channel *chan;
314 struct cfg80211_chan_def chandef;
315 u16 ht_opmode;
316 u32 flags;
317 enum ieee80211_sta_rx_bandwidth new_sta_bw;
318 int ret;
319
320 /* if HT was/is disabled, don't track any bandwidth changes */
321 if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
322 return 0;
323
324 /* don't check VHT if we associated as non-VHT station */
325 if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
326 vht_oper = NULL;
327
328 if (WARN_ON_ONCE(!sta))
329 return -EINVAL;
330
331 /*
332 * if bss configuration changed store the new one -
333 * this may be applicable even if channel is identical
334 */
335 ht_opmode = le16_to_cpu(ht_oper->operation_mode);
336 if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
337 *changed |= BSS_CHANGED_HT;
338 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
339 }
340
341 chan = sdata->vif.bss_conf.chandef.chan;
342 sband = local->hw.wiphy->bands[chan->band];
343
344 /* calculate new channel (type) based on HT/VHT operation IEs */
345 flags = ieee80211_determine_chantype(sdata, sband, chan,
346 ht_cap, ht_oper, vht_oper,
347 &chandef, true);
348
349 /*
350 * Downgrade the new channel if we associated with restricted
351 * capabilities. For example, if we associated as a 20 MHz STA
352 * to a 40 MHz AP (due to regulatory, capabilities or config
353 * reasons) then switching to a 40 MHz channel now won't do us
354 * any good -- we couldn't use it with the AP.
355 */
356 if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
357 chandef.width == NL80211_CHAN_WIDTH_80P80)
358 flags |= ieee80211_chandef_downgrade(&chandef);
359 if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
360 chandef.width == NL80211_CHAN_WIDTH_160)
361 flags |= ieee80211_chandef_downgrade(&chandef);
362 if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
363 chandef.width > NL80211_CHAN_WIDTH_20)
364 flags |= ieee80211_chandef_downgrade(&chandef);
365
366 if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
367 return 0;
368
369 sdata_info(sdata,
370 "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
371 ifmgd->bssid, chandef.chan->center_freq, chandef.width,
372 chandef.center_freq1, chandef.center_freq2);
373
374 if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
375 IEEE80211_STA_DISABLE_VHT |
376 IEEE80211_STA_DISABLE_40MHZ |
377 IEEE80211_STA_DISABLE_80P80MHZ |
378 IEEE80211_STA_DISABLE_160MHZ)) ||
379 !cfg80211_chandef_valid(&chandef)) {
380 sdata_info(sdata,
381 "AP %pM changed bandwidth in a way we can't support - disconnect\n",
382 ifmgd->bssid);
383 return -EINVAL;
384 }
385
386 switch (chandef.width) {
387 case NL80211_CHAN_WIDTH_20_NOHT:
388 case NL80211_CHAN_WIDTH_20:
389 new_sta_bw = IEEE80211_STA_RX_BW_20;
390 break;
391 case NL80211_CHAN_WIDTH_40:
392 new_sta_bw = IEEE80211_STA_RX_BW_40;
393 break;
394 case NL80211_CHAN_WIDTH_80:
395 new_sta_bw = IEEE80211_STA_RX_BW_80;
396 break;
397 case NL80211_CHAN_WIDTH_80P80:
398 case NL80211_CHAN_WIDTH_160:
399 new_sta_bw = IEEE80211_STA_RX_BW_160;
400 break;
401 default:
402 return -EINVAL;
403 }
404
405 if (new_sta_bw > sta->cur_max_bandwidth)
406 new_sta_bw = sta->cur_max_bandwidth;
407
408 if (new_sta_bw < sta->sta.bandwidth) {
409 sta->sta.bandwidth = new_sta_bw;
410 rate_control_rate_update(local, sband, sta,
411 IEEE80211_RC_BW_CHANGED);
412 }
413
414 ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
415 if (ret) {
416 sdata_info(sdata,
417 "AP %pM changed bandwidth to incompatible one - disconnect\n",
418 ifmgd->bssid);
419 return ret;
420 }
421
422 if (new_sta_bw > sta->sta.bandwidth) {
423 sta->sta.bandwidth = new_sta_bw;
424 rate_control_rate_update(local, sband, sta,
425 IEEE80211_RC_BW_CHANGED);
426 }
427
428 return 0;
429 }
430
431 /* frame sending functions */
432
433 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
434 struct sk_buff *skb, u8 ap_ht_param,
435 struct ieee80211_supported_band *sband,
436 struct ieee80211_channel *channel,
437 enum ieee80211_smps_mode smps)
438 {
439 u8 *pos;
440 u32 flags = channel->flags;
441 u16 cap;
442 struct ieee80211_sta_ht_cap ht_cap;
443
444 BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
445
446 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
447 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
448
449 /* determine capability flags */
450 cap = ht_cap.cap;
451
452 switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
453 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
454 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
455 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
456 cap &= ~IEEE80211_HT_CAP_SGI_40;
457 }
458 break;
459 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
460 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
461 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
462 cap &= ~IEEE80211_HT_CAP_SGI_40;
463 }
464 break;
465 }
466
467 /*
468 * If 40 MHz was disabled associate as though we weren't
469 * capable of 40 MHz -- some broken APs will never fall
470 * back to trying to transmit in 20 MHz.
471 */
472 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
473 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
474 cap &= ~IEEE80211_HT_CAP_SGI_40;
475 }
476
477 /* set SM PS mode properly */
478 cap &= ~IEEE80211_HT_CAP_SM_PS;
479 switch (smps) {
480 case IEEE80211_SMPS_AUTOMATIC:
481 case IEEE80211_SMPS_NUM_MODES:
482 WARN_ON(1);
483 case IEEE80211_SMPS_OFF:
484 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
485 IEEE80211_HT_CAP_SM_PS_SHIFT;
486 break;
487 case IEEE80211_SMPS_STATIC:
488 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
489 IEEE80211_HT_CAP_SM_PS_SHIFT;
490 break;
491 case IEEE80211_SMPS_DYNAMIC:
492 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
493 IEEE80211_HT_CAP_SM_PS_SHIFT;
494 break;
495 }
496
497 /* reserve and fill IE */
498 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
499 ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
500 }
501
502 /* This function determines vht capability flags for the association
503 * and builds the IE.
504 * Note - the function may set the owner of the MU-MIMO capability
505 */
506 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
507 struct sk_buff *skb,
508 struct ieee80211_supported_band *sband,
509 struct ieee80211_vht_cap *ap_vht_cap)
510 {
511 struct ieee80211_local *local = sdata->local;
512 u8 *pos;
513 u32 cap;
514 struct ieee80211_sta_vht_cap vht_cap;
515 u32 mask, ap_bf_sts, our_bf_sts;
516
517 BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
518
519 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
520 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
521
522 /* determine capability flags */
523 cap = vht_cap.cap;
524
525 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
526 u32 bw = cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
527
528 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
529 if (bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ ||
530 bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
531 cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
532 }
533
534 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
535 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
536 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
537 }
538
539 /*
540 * Some APs apparently get confused if our capabilities are better
541 * than theirs, so restrict what we advertise in the assoc request.
542 */
543 if (!(ap_vht_cap->vht_cap_info &
544 cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
545 cap &= ~(IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
546 IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE);
547 else if (!(ap_vht_cap->vht_cap_info &
548 cpu_to_le32(IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE)))
549 cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
550
551 /*
552 * If some other vif is using the MU-MIMO capablity we cannot associate
553 * using MU-MIMO - this will lead to contradictions in the group-id
554 * mechanism.
555 * Ownership is defined since association request, in order to avoid
556 * simultaneous associations with MU-MIMO.
557 */
558 if (cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE) {
559 bool disable_mu_mimo = false;
560 struct ieee80211_sub_if_data *other;
561
562 list_for_each_entry_rcu(other, &local->interfaces, list) {
563 if (other->vif.mu_mimo_owner) {
564 disable_mu_mimo = true;
565 break;
566 }
567 }
568 if (disable_mu_mimo)
569 cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
570 else
571 sdata->vif.mu_mimo_owner = true;
572 }
573
574 mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
575
576 ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask;
577 our_bf_sts = cap & mask;
578
579 if (ap_bf_sts < our_bf_sts) {
580 cap &= ~mask;
581 cap |= ap_bf_sts;
582 }
583
584 /* reserve and fill IE */
585 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
586 ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
587 }
588
589 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
590 {
591 struct ieee80211_local *local = sdata->local;
592 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
593 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
594 struct sk_buff *skb;
595 struct ieee80211_mgmt *mgmt;
596 u8 *pos, qos_info;
597 size_t offset = 0, noffset;
598 int i, count, rates_len, supp_rates_len, shift;
599 u16 capab;
600 struct ieee80211_supported_band *sband;
601 struct ieee80211_chanctx_conf *chanctx_conf;
602 struct ieee80211_channel *chan;
603 u32 rate_flags, rates = 0;
604
605 sdata_assert_lock(sdata);
606
607 rcu_read_lock();
608 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
609 if (WARN_ON(!chanctx_conf)) {
610 rcu_read_unlock();
611 return;
612 }
613 chan = chanctx_conf->def.chan;
614 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
615 rcu_read_unlock();
616 sband = local->hw.wiphy->bands[chan->band];
617 shift = ieee80211_vif_get_shift(&sdata->vif);
618
619 if (assoc_data->supp_rates_len) {
620 /*
621 * Get all rates supported by the device and the AP as
622 * some APs don't like getting a superset of their rates
623 * in the association request (e.g. D-Link DAP 1353 in
624 * b-only mode)...
625 */
626 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
627 assoc_data->supp_rates,
628 assoc_data->supp_rates_len,
629 &rates);
630 } else {
631 /*
632 * In case AP not provide any supported rates information
633 * before association, we send information element(s) with
634 * all rates that we support.
635 */
636 rates_len = 0;
637 for (i = 0; i < sband->n_bitrates; i++) {
638 if ((rate_flags & sband->bitrates[i].flags)
639 != rate_flags)
640 continue;
641 rates |= BIT(i);
642 rates_len++;
643 }
644 }
645
646 skb = alloc_skb(local->hw.extra_tx_headroom +
647 sizeof(*mgmt) + /* bit too much but doesn't matter */
648 2 + assoc_data->ssid_len + /* SSID */
649 4 + rates_len + /* (extended) rates */
650 4 + /* power capability */
651 2 + 2 * sband->n_channels + /* supported channels */
652 2 + sizeof(struct ieee80211_ht_cap) + /* HT */
653 2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
654 assoc_data->ie_len + /* extra IEs */
655 9, /* WMM */
656 GFP_KERNEL);
657 if (!skb)
658 return;
659
660 skb_reserve(skb, local->hw.extra_tx_headroom);
661
662 capab = WLAN_CAPABILITY_ESS;
663
664 if (sband->band == NL80211_BAND_2GHZ) {
665 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
666 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
667 }
668
669 if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
670 capab |= WLAN_CAPABILITY_PRIVACY;
671
672 if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
673 ieee80211_hw_check(&local->hw, SPECTRUM_MGMT))
674 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
675
676 if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM)
677 capab |= WLAN_CAPABILITY_RADIO_MEASURE;
678
679 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
680 memset(mgmt, 0, 24);
681 memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
682 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
683 memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
684
685 if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
686 skb_put(skb, 10);
687 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
688 IEEE80211_STYPE_REASSOC_REQ);
689 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
690 mgmt->u.reassoc_req.listen_interval =
691 cpu_to_le16(local->hw.conf.listen_interval);
692 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
693 ETH_ALEN);
694 } else {
695 skb_put(skb, 4);
696 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
697 IEEE80211_STYPE_ASSOC_REQ);
698 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
699 mgmt->u.assoc_req.listen_interval =
700 cpu_to_le16(local->hw.conf.listen_interval);
701 }
702
703 /* SSID */
704 pos = skb_put(skb, 2 + assoc_data->ssid_len);
705 *pos++ = WLAN_EID_SSID;
706 *pos++ = assoc_data->ssid_len;
707 memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
708
709 /* add all rates which were marked to be used above */
710 supp_rates_len = rates_len;
711 if (supp_rates_len > 8)
712 supp_rates_len = 8;
713
714 pos = skb_put(skb, supp_rates_len + 2);
715 *pos++ = WLAN_EID_SUPP_RATES;
716 *pos++ = supp_rates_len;
717
718 count = 0;
719 for (i = 0; i < sband->n_bitrates; i++) {
720 if (BIT(i) & rates) {
721 int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
722 5 * (1 << shift));
723 *pos++ = (u8) rate;
724 if (++count == 8)
725 break;
726 }
727 }
728
729 if (rates_len > count) {
730 pos = skb_put(skb, rates_len - count + 2);
731 *pos++ = WLAN_EID_EXT_SUPP_RATES;
732 *pos++ = rates_len - count;
733
734 for (i++; i < sband->n_bitrates; i++) {
735 if (BIT(i) & rates) {
736 int rate;
737 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
738 5 * (1 << shift));
739 *pos++ = (u8) rate;
740 }
741 }
742 }
743
744 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT ||
745 capab & WLAN_CAPABILITY_RADIO_MEASURE) {
746 pos = skb_put(skb, 4);
747 *pos++ = WLAN_EID_PWR_CAPABILITY;
748 *pos++ = 2;
749 *pos++ = 0; /* min tx power */
750 /* max tx power */
751 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
752 }
753
754 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
755 /* TODO: get this in reg domain format */
756 pos = skb_put(skb, 2 * sband->n_channels + 2);
757 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
758 *pos++ = 2 * sband->n_channels;
759 for (i = 0; i < sband->n_channels; i++) {
760 *pos++ = ieee80211_frequency_to_channel(
761 sband->channels[i].center_freq);
762 *pos++ = 1; /* one channel in the subband*/
763 }
764 }
765
766 /* if present, add any custom IEs that go before HT */
767 if (assoc_data->ie_len) {
768 static const u8 before_ht[] = {
769 WLAN_EID_SSID,
770 WLAN_EID_SUPP_RATES,
771 WLAN_EID_EXT_SUPP_RATES,
772 WLAN_EID_PWR_CAPABILITY,
773 WLAN_EID_SUPPORTED_CHANNELS,
774 WLAN_EID_RSN,
775 WLAN_EID_QOS_CAPA,
776 WLAN_EID_RRM_ENABLED_CAPABILITIES,
777 WLAN_EID_MOBILITY_DOMAIN,
778 WLAN_EID_FAST_BSS_TRANSITION, /* reassoc only */
779 WLAN_EID_RIC_DATA, /* reassoc only */
780 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
781 };
782 static const u8 after_ric[] = {
783 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
784 WLAN_EID_HT_CAPABILITY,
785 WLAN_EID_BSS_COEX_2040,
786 WLAN_EID_EXT_CAPABILITY,
787 WLAN_EID_QOS_TRAFFIC_CAPA,
788 WLAN_EID_TIM_BCAST_REQ,
789 WLAN_EID_INTERWORKING,
790 /* 60GHz doesn't happen right now */
791 WLAN_EID_VHT_CAPABILITY,
792 WLAN_EID_OPMODE_NOTIF,
793 };
794
795 noffset = ieee80211_ie_split_ric(assoc_data->ie,
796 assoc_data->ie_len,
797 before_ht,
798 ARRAY_SIZE(before_ht),
799 after_ric,
800 ARRAY_SIZE(after_ric),
801 offset);
802 pos = skb_put(skb, noffset - offset);
803 memcpy(pos, assoc_data->ie + offset, noffset - offset);
804 offset = noffset;
805 }
806
807 if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
808 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
809 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
810
811 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
812 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
813 sband, chan, sdata->smps_mode);
814
815 /* if present, add any custom IEs that go before VHT */
816 if (assoc_data->ie_len) {
817 static const u8 before_vht[] = {
818 WLAN_EID_SSID,
819 WLAN_EID_SUPP_RATES,
820 WLAN_EID_EXT_SUPP_RATES,
821 WLAN_EID_PWR_CAPABILITY,
822 WLAN_EID_SUPPORTED_CHANNELS,
823 WLAN_EID_RSN,
824 WLAN_EID_QOS_CAPA,
825 WLAN_EID_RRM_ENABLED_CAPABILITIES,
826 WLAN_EID_MOBILITY_DOMAIN,
827 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
828 WLAN_EID_HT_CAPABILITY,
829 WLAN_EID_BSS_COEX_2040,
830 WLAN_EID_EXT_CAPABILITY,
831 WLAN_EID_QOS_TRAFFIC_CAPA,
832 WLAN_EID_TIM_BCAST_REQ,
833 WLAN_EID_INTERWORKING,
834 };
835
836 /* RIC already taken above, so no need to handle here anymore */
837 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
838 before_vht, ARRAY_SIZE(before_vht),
839 offset);
840 pos = skb_put(skb, noffset - offset);
841 memcpy(pos, assoc_data->ie + offset, noffset - offset);
842 offset = noffset;
843 }
844
845 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
846 ieee80211_add_vht_ie(sdata, skb, sband,
847 &assoc_data->ap_vht_cap);
848
849 /* if present, add any custom non-vendor IEs that go after HT */
850 if (assoc_data->ie_len) {
851 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
852 assoc_data->ie_len,
853 offset);
854 pos = skb_put(skb, noffset - offset);
855 memcpy(pos, assoc_data->ie + offset, noffset - offset);
856 offset = noffset;
857 }
858
859 if (assoc_data->wmm) {
860 if (assoc_data->uapsd) {
861 qos_info = ifmgd->uapsd_queues;
862 qos_info |= (ifmgd->uapsd_max_sp_len <<
863 IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
864 } else {
865 qos_info = 0;
866 }
867
868 pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
869 }
870
871 /* add any remaining custom (i.e. vendor specific here) IEs */
872 if (assoc_data->ie_len) {
873 noffset = assoc_data->ie_len;
874 pos = skb_put(skb, noffset - offset);
875 memcpy(pos, assoc_data->ie + offset, noffset - offset);
876 }
877
878 drv_mgd_prepare_tx(local, sdata);
879
880 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
881 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
882 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
883 IEEE80211_TX_INTFL_MLME_CONN_TX;
884 ieee80211_tx_skb(sdata, skb);
885 }
886
887 void ieee80211_send_pspoll(struct ieee80211_local *local,
888 struct ieee80211_sub_if_data *sdata)
889 {
890 struct ieee80211_pspoll *pspoll;
891 struct sk_buff *skb;
892
893 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
894 if (!skb)
895 return;
896
897 pspoll = (struct ieee80211_pspoll *) skb->data;
898 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
899
900 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
901 ieee80211_tx_skb(sdata, skb);
902 }
903
904 void ieee80211_send_nullfunc(struct ieee80211_local *local,
905 struct ieee80211_sub_if_data *sdata,
906 bool powersave)
907 {
908 struct sk_buff *skb;
909 struct ieee80211_hdr_3addr *nullfunc;
910 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
911
912 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
913 if (!skb)
914 return;
915
916 nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
917 if (powersave)
918 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
919
920 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
921 IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
922
923 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
924 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
925
926 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
927 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
928
929 ieee80211_tx_skb(sdata, skb);
930 }
931
932 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
933 struct ieee80211_sub_if_data *sdata)
934 {
935 struct sk_buff *skb;
936 struct ieee80211_hdr *nullfunc;
937 __le16 fc;
938
939 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
940 return;
941
942 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
943 if (!skb)
944 return;
945
946 skb_reserve(skb, local->hw.extra_tx_headroom);
947
948 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
949 memset(nullfunc, 0, 30);
950 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
951 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
952 nullfunc->frame_control = fc;
953 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
954 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
955 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
956 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
957
958 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
959 ieee80211_tx_skb(sdata, skb);
960 }
961
962 /* spectrum management related things */
963 static void ieee80211_chswitch_work(struct work_struct *work)
964 {
965 struct ieee80211_sub_if_data *sdata =
966 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
967 struct ieee80211_local *local = sdata->local;
968 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
969 int ret;
970
971 if (!ieee80211_sdata_running(sdata))
972 return;
973
974 sdata_lock(sdata);
975 mutex_lock(&local->mtx);
976 mutex_lock(&local->chanctx_mtx);
977
978 if (!ifmgd->associated)
979 goto out;
980
981 if (!sdata->vif.csa_active)
982 goto out;
983
984 /*
985 * using reservation isn't immediate as it may be deferred until later
986 * with multi-vif. once reservation is complete it will re-schedule the
987 * work with no reserved_chanctx so verify chandef to check if it
988 * completed successfully
989 */
990
991 if (sdata->reserved_chanctx) {
992 /*
993 * with multi-vif csa driver may call ieee80211_csa_finish()
994 * many times while waiting for other interfaces to use their
995 * reservations
996 */
997 if (sdata->reserved_ready)
998 goto out;
999
1000 ret = ieee80211_vif_use_reserved_context(sdata);
1001 if (ret) {
1002 sdata_info(sdata,
1003 "failed to use reserved channel context, disconnecting (err=%d)\n",
1004 ret);
1005 ieee80211_queue_work(&sdata->local->hw,
1006 &ifmgd->csa_connection_drop_work);
1007 goto out;
1008 }
1009
1010 goto out;
1011 }
1012
1013 if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
1014 &sdata->csa_chandef)) {
1015 sdata_info(sdata,
1016 "failed to finalize channel switch, disconnecting\n");
1017 ieee80211_queue_work(&sdata->local->hw,
1018 &ifmgd->csa_connection_drop_work);
1019 goto out;
1020 }
1021
1022 /* XXX: shouldn't really modify cfg80211-owned data! */
1023 ifmgd->associated->channel = sdata->csa_chandef.chan;
1024
1025 ifmgd->csa_waiting_bcn = true;
1026
1027 ieee80211_sta_reset_beacon_monitor(sdata);
1028 ieee80211_sta_reset_conn_monitor(sdata);
1029
1030 out:
1031 mutex_unlock(&local->chanctx_mtx);
1032 mutex_unlock(&local->mtx);
1033 sdata_unlock(sdata);
1034 }
1035
1036 static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata)
1037 {
1038 struct ieee80211_local *local = sdata->local;
1039 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1040 int ret;
1041
1042 sdata_assert_lock(sdata);
1043
1044 WARN_ON(!sdata->vif.csa_active);
1045
1046 if (sdata->csa_block_tx) {
1047 ieee80211_wake_vif_queues(local, sdata,
1048 IEEE80211_QUEUE_STOP_REASON_CSA);
1049 sdata->csa_block_tx = false;
1050 }
1051
1052 sdata->vif.csa_active = false;
1053 ifmgd->csa_waiting_bcn = false;
1054
1055 ret = drv_post_channel_switch(sdata);
1056 if (ret) {
1057 sdata_info(sdata,
1058 "driver post channel switch failed, disconnecting\n");
1059 ieee80211_queue_work(&local->hw,
1060 &ifmgd->csa_connection_drop_work);
1061 return;
1062 }
1063
1064 cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef);
1065 }
1066
1067 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
1068 {
1069 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1070 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1071
1072 trace_api_chswitch_done(sdata, success);
1073 if (!success) {
1074 sdata_info(sdata,
1075 "driver channel switch failed, disconnecting\n");
1076 ieee80211_queue_work(&sdata->local->hw,
1077 &ifmgd->csa_connection_drop_work);
1078 } else {
1079 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1080 }
1081 }
1082 EXPORT_SYMBOL(ieee80211_chswitch_done);
1083
1084 static void ieee80211_chswitch_timer(unsigned long data)
1085 {
1086 struct ieee80211_sub_if_data *sdata =
1087 (struct ieee80211_sub_if_data *) data;
1088
1089 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1090 }
1091
1092 static void
1093 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1094 u64 timestamp, u32 device_timestamp,
1095 struct ieee802_11_elems *elems,
1096 bool beacon)
1097 {
1098 struct ieee80211_local *local = sdata->local;
1099 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1100 struct cfg80211_bss *cbss = ifmgd->associated;
1101 struct ieee80211_chanctx_conf *conf;
1102 struct ieee80211_chanctx *chanctx;
1103 enum nl80211_band current_band;
1104 struct ieee80211_csa_ie csa_ie;
1105 struct ieee80211_channel_switch ch_switch;
1106 int res;
1107
1108 sdata_assert_lock(sdata);
1109
1110 if (!cbss)
1111 return;
1112
1113 if (local->scanning)
1114 return;
1115
1116 /* disregard subsequent announcements if we are already processing */
1117 if (sdata->vif.csa_active)
1118 return;
1119
1120 current_band = cbss->channel->band;
1121 memset(&csa_ie, 0, sizeof(csa_ie));
1122 res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
1123 ifmgd->flags,
1124 ifmgd->associated->bssid, &csa_ie);
1125 if (res < 0)
1126 ieee80211_queue_work(&local->hw,
1127 &ifmgd->csa_connection_drop_work);
1128 if (res)
1129 return;
1130
1131 if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1132 IEEE80211_CHAN_DISABLED)) {
1133 sdata_info(sdata,
1134 "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1135 ifmgd->associated->bssid,
1136 csa_ie.chandef.chan->center_freq,
1137 csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1138 csa_ie.chandef.center_freq2);
1139 ieee80211_queue_work(&local->hw,
1140 &ifmgd->csa_connection_drop_work);
1141 return;
1142 }
1143
1144 if (cfg80211_chandef_identical(&csa_ie.chandef,
1145 &sdata->vif.bss_conf.chandef)) {
1146 if (ifmgd->csa_ignored_same_chan)
1147 return;
1148 sdata_info(sdata,
1149 "AP %pM tries to chanswitch to same channel, ignore\n",
1150 ifmgd->associated->bssid);
1151 ifmgd->csa_ignored_same_chan = true;
1152 return;
1153 }
1154
1155 /*
1156 * Drop all TDLS peers - either we disconnect or move to a different
1157 * channel from this point on. There's no telling what our peer will do.
1158 * The TDLS WIDER_BW scenario is also problematic, as peers might now
1159 * have an incompatible wider chandef.
1160 */
1161 ieee80211_teardown_tdls_peers(sdata);
1162
1163 mutex_lock(&local->mtx);
1164 mutex_lock(&local->chanctx_mtx);
1165 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1166 lockdep_is_held(&local->chanctx_mtx));
1167 if (!conf) {
1168 sdata_info(sdata,
1169 "no channel context assigned to vif?, disconnecting\n");
1170 goto drop_connection;
1171 }
1172
1173 chanctx = container_of(conf, struct ieee80211_chanctx, conf);
1174
1175 if (local->use_chanctx &&
1176 !ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA)) {
1177 sdata_info(sdata,
1178 "driver doesn't support chan-switch with channel contexts\n");
1179 goto drop_connection;
1180 }
1181
1182 ch_switch.timestamp = timestamp;
1183 ch_switch.device_timestamp = device_timestamp;
1184 ch_switch.block_tx = csa_ie.mode;
1185 ch_switch.chandef = csa_ie.chandef;
1186 ch_switch.count = csa_ie.count;
1187
1188 if (drv_pre_channel_switch(sdata, &ch_switch)) {
1189 sdata_info(sdata,
1190 "preparing for channel switch failed, disconnecting\n");
1191 goto drop_connection;
1192 }
1193
1194 res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
1195 chanctx->mode, false);
1196 if (res) {
1197 sdata_info(sdata,
1198 "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
1199 res);
1200 goto drop_connection;
1201 }
1202 mutex_unlock(&local->chanctx_mtx);
1203
1204 sdata->vif.csa_active = true;
1205 sdata->csa_chandef = csa_ie.chandef;
1206 sdata->csa_block_tx = csa_ie.mode;
1207 ifmgd->csa_ignored_same_chan = false;
1208
1209 if (sdata->csa_block_tx)
1210 ieee80211_stop_vif_queues(local, sdata,
1211 IEEE80211_QUEUE_STOP_REASON_CSA);
1212 mutex_unlock(&local->mtx);
1213
1214 cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
1215 csa_ie.count);
1216
1217 if (local->ops->channel_switch) {
1218 /* use driver's channel switch callback */
1219 drv_channel_switch(local, sdata, &ch_switch);
1220 return;
1221 }
1222
1223 /* channel switch handled in software */
1224 if (csa_ie.count <= 1)
1225 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1226 else
1227 mod_timer(&ifmgd->chswitch_timer,
1228 TU_TO_EXP_TIME((csa_ie.count - 1) *
1229 cbss->beacon_interval));
1230 return;
1231 drop_connection:
1232 ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work);
1233 mutex_unlock(&local->chanctx_mtx);
1234 mutex_unlock(&local->mtx);
1235 }
1236
1237 static bool
1238 ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
1239 struct ieee80211_channel *channel,
1240 const u8 *country_ie, u8 country_ie_len,
1241 const u8 *pwr_constr_elem,
1242 int *chan_pwr, int *pwr_reduction)
1243 {
1244 struct ieee80211_country_ie_triplet *triplet;
1245 int chan = ieee80211_frequency_to_channel(channel->center_freq);
1246 int i, chan_increment;
1247 bool have_chan_pwr = false;
1248
1249 /* Invalid IE */
1250 if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1251 return false;
1252
1253 triplet = (void *)(country_ie + 3);
1254 country_ie_len -= 3;
1255
1256 switch (channel->band) {
1257 default:
1258 WARN_ON_ONCE(1);
1259 /* fall through */
1260 case NL80211_BAND_2GHZ:
1261 case NL80211_BAND_60GHZ:
1262 chan_increment = 1;
1263 break;
1264 case NL80211_BAND_5GHZ:
1265 chan_increment = 4;
1266 break;
1267 }
1268
1269 /* find channel */
1270 while (country_ie_len >= 3) {
1271 u8 first_channel = triplet->chans.first_channel;
1272
1273 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1274 goto next;
1275
1276 for (i = 0; i < triplet->chans.num_channels; i++) {
1277 if (first_channel + i * chan_increment == chan) {
1278 have_chan_pwr = true;
1279 *chan_pwr = triplet->chans.max_power;
1280 break;
1281 }
1282 }
1283 if (have_chan_pwr)
1284 break;
1285
1286 next:
1287 triplet++;
1288 country_ie_len -= 3;
1289 }
1290
1291 if (have_chan_pwr && pwr_constr_elem)
1292 *pwr_reduction = *pwr_constr_elem;
1293 else
1294 *pwr_reduction = 0;
1295
1296 return have_chan_pwr;
1297 }
1298
1299 static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata,
1300 struct ieee80211_channel *channel,
1301 const u8 *cisco_dtpc_ie,
1302 int *pwr_level)
1303 {
1304 /* From practical testing, the first data byte of the DTPC element
1305 * seems to contain the requested dBm level, and the CLI on Cisco
1306 * APs clearly state the range is -127 to 127 dBm, which indicates
1307 * a signed byte, although it seemingly never actually goes negative.
1308 * The other byte seems to always be zero.
1309 */
1310 *pwr_level = (__s8)cisco_dtpc_ie[4];
1311 }
1312
1313 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1314 struct ieee80211_channel *channel,
1315 struct ieee80211_mgmt *mgmt,
1316 const u8 *country_ie, u8 country_ie_len,
1317 const u8 *pwr_constr_ie,
1318 const u8 *cisco_dtpc_ie)
1319 {
1320 bool has_80211h_pwr = false, has_cisco_pwr = false;
1321 int chan_pwr = 0, pwr_reduction_80211h = 0;
1322 int pwr_level_cisco, pwr_level_80211h;
1323 int new_ap_level;
1324 __le16 capab = mgmt->u.probe_resp.capab_info;
1325
1326 if (country_ie &&
1327 (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) ||
1328 capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) {
1329 has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
1330 sdata, channel, country_ie, country_ie_len,
1331 pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1332 pwr_level_80211h =
1333 max_t(int, 0, chan_pwr - pwr_reduction_80211h);
1334 }
1335
1336 if (cisco_dtpc_ie) {
1337 ieee80211_find_cisco_dtpc(
1338 sdata, channel, cisco_dtpc_ie, &pwr_level_cisco);
1339 has_cisco_pwr = true;
1340 }
1341
1342 if (!has_80211h_pwr && !has_cisco_pwr)
1343 return 0;
1344
1345 /* If we have both 802.11h and Cisco DTPC, apply both limits
1346 * by picking the smallest of the two power levels advertised.
1347 */
1348 if (has_80211h_pwr &&
1349 (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) {
1350 new_ap_level = pwr_level_80211h;
1351
1352 if (sdata->ap_power_level == new_ap_level)
1353 return 0;
1354
1355 sdata_dbg(sdata,
1356 "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1357 pwr_level_80211h, chan_pwr, pwr_reduction_80211h,
1358 sdata->u.mgd.bssid);
1359 } else { /* has_cisco_pwr is always true here. */
1360 new_ap_level = pwr_level_cisco;
1361
1362 if (sdata->ap_power_level == new_ap_level)
1363 return 0;
1364
1365 sdata_dbg(sdata,
1366 "Limiting TX power to %d dBm as advertised by %pM\n",
1367 pwr_level_cisco, sdata->u.mgd.bssid);
1368 }
1369
1370 sdata->ap_power_level = new_ap_level;
1371 if (__ieee80211_recalc_txpower(sdata))
1372 return BSS_CHANGED_TXPOWER;
1373 return 0;
1374 }
1375
1376 /* powersave */
1377 static void ieee80211_enable_ps(struct ieee80211_local *local,
1378 struct ieee80211_sub_if_data *sdata)
1379 {
1380 struct ieee80211_conf *conf = &local->hw.conf;
1381
1382 /*
1383 * If we are scanning right now then the parameters will
1384 * take effect when scan finishes.
1385 */
1386 if (local->scanning)
1387 return;
1388
1389 if (conf->dynamic_ps_timeout > 0 &&
1390 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) {
1391 mod_timer(&local->dynamic_ps_timer, jiffies +
1392 msecs_to_jiffies(conf->dynamic_ps_timeout));
1393 } else {
1394 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
1395 ieee80211_send_nullfunc(local, sdata, true);
1396
1397 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1398 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
1399 return;
1400
1401 conf->flags |= IEEE80211_CONF_PS;
1402 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1403 }
1404 }
1405
1406 static void ieee80211_change_ps(struct ieee80211_local *local)
1407 {
1408 struct ieee80211_conf *conf = &local->hw.conf;
1409
1410 if (local->ps_sdata) {
1411 ieee80211_enable_ps(local, local->ps_sdata);
1412 } else if (conf->flags & IEEE80211_CONF_PS) {
1413 conf->flags &= ~IEEE80211_CONF_PS;
1414 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1415 del_timer_sync(&local->dynamic_ps_timer);
1416 cancel_work_sync(&local->dynamic_ps_enable_work);
1417 }
1418 }
1419
1420 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1421 {
1422 struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1423 struct sta_info *sta = NULL;
1424 bool authorized = false;
1425
1426 if (!mgd->powersave)
1427 return false;
1428
1429 if (mgd->broken_ap)
1430 return false;
1431
1432 if (!mgd->associated)
1433 return false;
1434
1435 if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1436 return false;
1437
1438 if (!mgd->have_beacon)
1439 return false;
1440
1441 rcu_read_lock();
1442 sta = sta_info_get(sdata, mgd->bssid);
1443 if (sta)
1444 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1445 rcu_read_unlock();
1446
1447 return authorized;
1448 }
1449
1450 /* need to hold RTNL or interface lock */
1451 void ieee80211_recalc_ps(struct ieee80211_local *local)
1452 {
1453 struct ieee80211_sub_if_data *sdata, *found = NULL;
1454 int count = 0;
1455 int timeout;
1456
1457 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) {
1458 local->ps_sdata = NULL;
1459 return;
1460 }
1461
1462 list_for_each_entry(sdata, &local->interfaces, list) {
1463 if (!ieee80211_sdata_running(sdata))
1464 continue;
1465 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1466 /* If an AP vif is found, then disable PS
1467 * by setting the count to zero thereby setting
1468 * ps_sdata to NULL.
1469 */
1470 count = 0;
1471 break;
1472 }
1473 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1474 continue;
1475 found = sdata;
1476 count++;
1477 }
1478
1479 if (count == 1 && ieee80211_powersave_allowed(found)) {
1480 u8 dtimper = found->u.mgd.dtim_period;
1481 s32 beaconint_us;
1482
1483 beaconint_us = ieee80211_tu_to_usec(
1484 found->vif.bss_conf.beacon_int);
1485
1486 timeout = local->dynamic_ps_forced_timeout;
1487 if (timeout < 0)
1488 timeout = 100;
1489 local->hw.conf.dynamic_ps_timeout = timeout;
1490
1491 /* If the TIM IE is invalid, pretend the value is 1 */
1492 if (!dtimper)
1493 dtimper = 1;
1494
1495 local->hw.conf.ps_dtim_period = dtimper;
1496 local->ps_sdata = found;
1497 } else {
1498 local->ps_sdata = NULL;
1499 }
1500
1501 ieee80211_change_ps(local);
1502 }
1503
1504 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1505 {
1506 bool ps_allowed = ieee80211_powersave_allowed(sdata);
1507
1508 if (sdata->vif.bss_conf.ps != ps_allowed) {
1509 sdata->vif.bss_conf.ps = ps_allowed;
1510 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1511 }
1512 }
1513
1514 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1515 {
1516 struct ieee80211_local *local =
1517 container_of(work, struct ieee80211_local,
1518 dynamic_ps_disable_work);
1519
1520 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1521 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1522 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1523 }
1524
1525 ieee80211_wake_queues_by_reason(&local->hw,
1526 IEEE80211_MAX_QUEUE_MAP,
1527 IEEE80211_QUEUE_STOP_REASON_PS,
1528 false);
1529 }
1530
1531 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1532 {
1533 struct ieee80211_local *local =
1534 container_of(work, struct ieee80211_local,
1535 dynamic_ps_enable_work);
1536 struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1537 struct ieee80211_if_managed *ifmgd;
1538 unsigned long flags;
1539 int q;
1540
1541 /* can only happen when PS was just disabled anyway */
1542 if (!sdata)
1543 return;
1544
1545 ifmgd = &sdata->u.mgd;
1546
1547 if (local->hw.conf.flags & IEEE80211_CONF_PS)
1548 return;
1549
1550 if (local->hw.conf.dynamic_ps_timeout > 0) {
1551 /* don't enter PS if TX frames are pending */
1552 if (drv_tx_frames_pending(local)) {
1553 mod_timer(&local->dynamic_ps_timer, jiffies +
1554 msecs_to_jiffies(
1555 local->hw.conf.dynamic_ps_timeout));
1556 return;
1557 }
1558
1559 /*
1560 * transmission can be stopped by others which leads to
1561 * dynamic_ps_timer expiry. Postpone the ps timer if it
1562 * is not the actual idle state.
1563 */
1564 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1565 for (q = 0; q < local->hw.queues; q++) {
1566 if (local->queue_stop_reasons[q]) {
1567 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1568 flags);
1569 mod_timer(&local->dynamic_ps_timer, jiffies +
1570 msecs_to_jiffies(
1571 local->hw.conf.dynamic_ps_timeout));
1572 return;
1573 }
1574 }
1575 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1576 }
1577
1578 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1579 !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1580 if (drv_tx_frames_pending(local)) {
1581 mod_timer(&local->dynamic_ps_timer, jiffies +
1582 msecs_to_jiffies(
1583 local->hw.conf.dynamic_ps_timeout));
1584 } else {
1585 ieee80211_send_nullfunc(local, sdata, true);
1586 /* Flush to get the tx status of nullfunc frame */
1587 ieee80211_flush_queues(local, sdata, false);
1588 }
1589 }
1590
1591 if (!(ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
1592 ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) ||
1593 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1594 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1595 local->hw.conf.flags |= IEEE80211_CONF_PS;
1596 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1597 }
1598 }
1599
1600 void ieee80211_dynamic_ps_timer(unsigned long data)
1601 {
1602 struct ieee80211_local *local = (void *) data;
1603
1604 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1605 }
1606
1607 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1608 {
1609 struct delayed_work *delayed_work = to_delayed_work(work);
1610 struct ieee80211_sub_if_data *sdata =
1611 container_of(delayed_work, struct ieee80211_sub_if_data,
1612 dfs_cac_timer_work);
1613 struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1614
1615 mutex_lock(&sdata->local->mtx);
1616 if (sdata->wdev.cac_started) {
1617 ieee80211_vif_release_channel(sdata);
1618 cfg80211_cac_event(sdata->dev, &chandef,
1619 NL80211_RADAR_CAC_FINISHED,
1620 GFP_KERNEL);
1621 }
1622 mutex_unlock(&sdata->local->mtx);
1623 }
1624
1625 static bool
1626 __ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1627 {
1628 struct ieee80211_local *local = sdata->local;
1629 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1630 bool ret = false;
1631 int ac;
1632
1633 if (local->hw.queues < IEEE80211_NUM_ACS)
1634 return false;
1635
1636 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1637 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
1638 int non_acm_ac;
1639 unsigned long now = jiffies;
1640
1641 if (tx_tspec->action == TX_TSPEC_ACTION_NONE &&
1642 tx_tspec->admitted_time &&
1643 time_after(now, tx_tspec->time_slice_start + HZ)) {
1644 tx_tspec->consumed_tx_time = 0;
1645 tx_tspec->time_slice_start = now;
1646
1647 if (tx_tspec->downgraded)
1648 tx_tspec->action =
1649 TX_TSPEC_ACTION_STOP_DOWNGRADE;
1650 }
1651
1652 switch (tx_tspec->action) {
1653 case TX_TSPEC_ACTION_STOP_DOWNGRADE:
1654 /* take the original parameters */
1655 if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac]))
1656 sdata_err(sdata,
1657 "failed to set TX queue parameters for queue %d\n",
1658 ac);
1659 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1660 tx_tspec->downgraded = false;
1661 ret = true;
1662 break;
1663 case TX_TSPEC_ACTION_DOWNGRADE:
1664 if (time_after(now, tx_tspec->time_slice_start + HZ)) {
1665 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1666 ret = true;
1667 break;
1668 }
1669 /* downgrade next lower non-ACM AC */
1670 for (non_acm_ac = ac + 1;
1671 non_acm_ac < IEEE80211_NUM_ACS;
1672 non_acm_ac++)
1673 if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac)))
1674 break;
1675 /* Usually the loop will result in using BK even if it
1676 * requires admission control, but such a configuration
1677 * makes no sense and we have to transmit somehow - the
1678 * AC selection does the same thing.
1679 * If we started out trying to downgrade from BK, then
1680 * the extra condition here might be needed.
1681 */
1682 if (non_acm_ac >= IEEE80211_NUM_ACS)
1683 non_acm_ac = IEEE80211_AC_BK;
1684 if (drv_conf_tx(local, sdata, ac,
1685 &sdata->tx_conf[non_acm_ac]))
1686 sdata_err(sdata,
1687 "failed to set TX queue parameters for queue %d\n",
1688 ac);
1689 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1690 ret = true;
1691 schedule_delayed_work(&ifmgd->tx_tspec_wk,
1692 tx_tspec->time_slice_start + HZ - now + 1);
1693 break;
1694 case TX_TSPEC_ACTION_NONE:
1695 /* nothing now */
1696 break;
1697 }
1698 }
1699
1700 return ret;
1701 }
1702
1703 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1704 {
1705 if (__ieee80211_sta_handle_tspec_ac_params(sdata))
1706 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
1707 }
1708
1709 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work)
1710 {
1711 struct ieee80211_sub_if_data *sdata;
1712
1713 sdata = container_of(work, struct ieee80211_sub_if_data,
1714 u.mgd.tx_tspec_wk.work);
1715 ieee80211_sta_handle_tspec_ac_params(sdata);
1716 }
1717
1718 /* MLME */
1719 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1720 struct ieee80211_sub_if_data *sdata,
1721 const u8 *wmm_param, size_t wmm_param_len)
1722 {
1723 struct ieee80211_tx_queue_params params[IEEE80211_NUM_ACS];
1724 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1725 size_t left;
1726 int count, ac;
1727 const u8 *pos;
1728 u8 uapsd_queues = 0;
1729
1730 if (!local->ops->conf_tx)
1731 return false;
1732
1733 if (local->hw.queues < IEEE80211_NUM_ACS)
1734 return false;
1735
1736 if (!wmm_param)
1737 return false;
1738
1739 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1740 return false;
1741
1742 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1743 uapsd_queues = ifmgd->uapsd_queues;
1744
1745 count = wmm_param[6] & 0x0f;
1746 if (count == ifmgd->wmm_last_param_set)
1747 return false;
1748 ifmgd->wmm_last_param_set = count;
1749
1750 pos = wmm_param + 8;
1751 left = wmm_param_len - 8;
1752
1753 memset(&params, 0, sizeof(params));
1754
1755 sdata->wmm_acm = 0;
1756 for (; left >= 4; left -= 4, pos += 4) {
1757 int aci = (pos[0] >> 5) & 0x03;
1758 int acm = (pos[0] >> 4) & 0x01;
1759 bool uapsd = false;
1760
1761 switch (aci) {
1762 case 1: /* AC_BK */
1763 ac = IEEE80211_AC_BK;
1764 if (acm)
1765 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1766 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1767 uapsd = true;
1768 break;
1769 case 2: /* AC_VI */
1770 ac = IEEE80211_AC_VI;
1771 if (acm)
1772 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1773 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1774 uapsd = true;
1775 break;
1776 case 3: /* AC_VO */
1777 ac = IEEE80211_AC_VO;
1778 if (acm)
1779 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1780 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1781 uapsd = true;
1782 break;
1783 case 0: /* AC_BE */
1784 default:
1785 ac = IEEE80211_AC_BE;
1786 if (acm)
1787 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1788 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1789 uapsd = true;
1790 break;
1791 }
1792
1793 params[ac].aifs = pos[0] & 0x0f;
1794
1795 if (params[ac].aifs < 2) {
1796 sdata_info(sdata,
1797 "AP has invalid WMM params (AIFSN=%d for ACI %d), will use 2\n",
1798 params[ac].aifs, aci);
1799 params[ac].aifs = 2;
1800 }
1801 params[ac].cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1802 params[ac].cw_min = ecw2cw(pos[1] & 0x0f);
1803 params[ac].txop = get_unaligned_le16(pos + 2);
1804 params[ac].acm = acm;
1805 params[ac].uapsd = uapsd;
1806
1807 if (params[ac].cw_min > params[ac].cw_max) {
1808 sdata_info(sdata,
1809 "AP has invalid WMM params (CWmin/max=%d/%d for ACI %d), using defaults\n",
1810 params[ac].cw_min, params[ac].cw_max, aci);
1811 return false;
1812 }
1813 }
1814
1815 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1816 mlme_dbg(sdata,
1817 "WMM AC=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n",
1818 ac, params[ac].acm,
1819 params[ac].aifs, params[ac].cw_min, params[ac].cw_max,
1820 params[ac].txop, params[ac].uapsd,
1821 ifmgd->tx_tspec[ac].downgraded);
1822 sdata->tx_conf[ac] = params[ac];
1823 if (!ifmgd->tx_tspec[ac].downgraded &&
1824 drv_conf_tx(local, sdata, ac, &params[ac]))
1825 sdata_err(sdata,
1826 "failed to set TX queue parameters for AC %d\n",
1827 ac);
1828 }
1829
1830 /* enable WMM or activate new settings */
1831 sdata->vif.bss_conf.qos = true;
1832 return true;
1833 }
1834
1835 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1836 {
1837 lockdep_assert_held(&sdata->local->mtx);
1838
1839 sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1840 ieee80211_run_deferred_scan(sdata->local);
1841 }
1842
1843 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1844 {
1845 mutex_lock(&sdata->local->mtx);
1846 __ieee80211_stop_poll(sdata);
1847 mutex_unlock(&sdata->local->mtx);
1848 }
1849
1850 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1851 u16 capab, bool erp_valid, u8 erp)
1852 {
1853 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1854 u32 changed = 0;
1855 bool use_protection;
1856 bool use_short_preamble;
1857 bool use_short_slot;
1858
1859 if (erp_valid) {
1860 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1861 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1862 } else {
1863 use_protection = false;
1864 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1865 }
1866
1867 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1868 if (ieee80211_get_sdata_band(sdata) == NL80211_BAND_5GHZ)
1869 use_short_slot = true;
1870
1871 if (use_protection != bss_conf->use_cts_prot) {
1872 bss_conf->use_cts_prot = use_protection;
1873 changed |= BSS_CHANGED_ERP_CTS_PROT;
1874 }
1875
1876 if (use_short_preamble != bss_conf->use_short_preamble) {
1877 bss_conf->use_short_preamble = use_short_preamble;
1878 changed |= BSS_CHANGED_ERP_PREAMBLE;
1879 }
1880
1881 if (use_short_slot != bss_conf->use_short_slot) {
1882 bss_conf->use_short_slot = use_short_slot;
1883 changed |= BSS_CHANGED_ERP_SLOT;
1884 }
1885
1886 return changed;
1887 }
1888
1889 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1890 struct cfg80211_bss *cbss,
1891 u32 bss_info_changed)
1892 {
1893 struct ieee80211_bss *bss = (void *)cbss->priv;
1894 struct ieee80211_local *local = sdata->local;
1895 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1896
1897 bss_info_changed |= BSS_CHANGED_ASSOC;
1898 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1899 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1900
1901 sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1902 beacon_loss_count * bss_conf->beacon_int));
1903
1904 sdata->u.mgd.associated = cbss;
1905 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1906
1907 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1908
1909 if (sdata->vif.p2p ||
1910 sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) {
1911 const struct cfg80211_bss_ies *ies;
1912
1913 rcu_read_lock();
1914 ies = rcu_dereference(cbss->ies);
1915 if (ies) {
1916 int ret;
1917
1918 ret = cfg80211_get_p2p_attr(
1919 ies->data, ies->len,
1920 IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1921 (u8 *) &bss_conf->p2p_noa_attr,
1922 sizeof(bss_conf->p2p_noa_attr));
1923 if (ret >= 2) {
1924 sdata->u.mgd.p2p_noa_index =
1925 bss_conf->p2p_noa_attr.index;
1926 bss_info_changed |= BSS_CHANGED_P2P_PS;
1927 }
1928 }
1929 rcu_read_unlock();
1930 }
1931
1932 /* just to be sure */
1933 ieee80211_stop_poll(sdata);
1934
1935 ieee80211_led_assoc(local, 1);
1936
1937 if (sdata->u.mgd.have_beacon) {
1938 /*
1939 * If the AP is buggy we may get here with no DTIM period
1940 * known, so assume it's 1 which is the only safe assumption
1941 * in that case, although if the TIM IE is broken powersave
1942 * probably just won't work at all.
1943 */
1944 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1945 bss_conf->beacon_rate = bss->beacon_rate;
1946 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1947 } else {
1948 bss_conf->beacon_rate = NULL;
1949 bss_conf->dtim_period = 0;
1950 }
1951
1952 bss_conf->assoc = 1;
1953
1954 /* Tell the driver to monitor connection quality (if supported) */
1955 if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1956 bss_conf->cqm_rssi_thold)
1957 bss_info_changed |= BSS_CHANGED_CQM;
1958
1959 /* Enable ARP filtering */
1960 if (bss_conf->arp_addr_cnt)
1961 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1962
1963 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1964
1965 mutex_lock(&local->iflist_mtx);
1966 ieee80211_recalc_ps(local);
1967 mutex_unlock(&local->iflist_mtx);
1968
1969 ieee80211_recalc_smps(sdata);
1970 ieee80211_recalc_ps_vif(sdata);
1971
1972 netif_carrier_on(sdata->dev);
1973 }
1974
1975 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1976 u16 stype, u16 reason, bool tx,
1977 u8 *frame_buf)
1978 {
1979 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1980 struct ieee80211_local *local = sdata->local;
1981 u32 changed = 0;
1982
1983 sdata_assert_lock(sdata);
1984
1985 if (WARN_ON_ONCE(tx && !frame_buf))
1986 return;
1987
1988 if (WARN_ON(!ifmgd->associated))
1989 return;
1990
1991 ieee80211_stop_poll(sdata);
1992
1993 ifmgd->associated = NULL;
1994 netif_carrier_off(sdata->dev);
1995
1996 /*
1997 * if we want to get out of ps before disassoc (why?) we have
1998 * to do it before sending disassoc, as otherwise the null-packet
1999 * won't be valid.
2000 */
2001 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2002 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2003 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2004 }
2005 local->ps_sdata = NULL;
2006
2007 /* disable per-vif ps */
2008 ieee80211_recalc_ps_vif(sdata);
2009
2010 /* make sure ongoing transmission finishes */
2011 synchronize_net();
2012
2013 /*
2014 * drop any frame before deauth/disassoc, this can be data or
2015 * management frame. Since we are disconnecting, we should not
2016 * insist sending these frames which can take time and delay
2017 * the disconnection and possible the roaming.
2018 */
2019 if (tx)
2020 ieee80211_flush_queues(local, sdata, true);
2021
2022 /* deauthenticate/disassociate now */
2023 if (tx || frame_buf)
2024 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
2025 reason, tx, frame_buf);
2026
2027 /* flush out frame - make sure the deauth was actually sent */
2028 if (tx)
2029 ieee80211_flush_queues(local, sdata, false);
2030
2031 /* clear bssid only after building the needed mgmt frames */
2032 eth_zero_addr(ifmgd->bssid);
2033
2034 /* remove AP and TDLS peers */
2035 sta_info_flush(sdata);
2036
2037 /* finally reset all BSS / config parameters */
2038 changed |= ieee80211_reset_erp_info(sdata);
2039
2040 ieee80211_led_assoc(local, 0);
2041 changed |= BSS_CHANGED_ASSOC;
2042 sdata->vif.bss_conf.assoc = false;
2043
2044 ifmgd->p2p_noa_index = -1;
2045 memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
2046 sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2047
2048 /* on the next assoc, re-program HT/VHT parameters */
2049 memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
2050 memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2051 memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
2052 memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2053
2054 /* reset MU-MIMO ownership and group data */
2055 memset(sdata->vif.bss_conf.mu_group.membership, 0,
2056 sizeof(sdata->vif.bss_conf.mu_group.membership));
2057 memset(sdata->vif.bss_conf.mu_group.position, 0,
2058 sizeof(sdata->vif.bss_conf.mu_group.position));
2059 changed |= BSS_CHANGED_MU_GROUPS;
2060 sdata->vif.mu_mimo_owner = false;
2061
2062 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2063
2064 del_timer_sync(&local->dynamic_ps_timer);
2065 cancel_work_sync(&local->dynamic_ps_enable_work);
2066
2067 /* Disable ARP filtering */
2068 if (sdata->vif.bss_conf.arp_addr_cnt)
2069 changed |= BSS_CHANGED_ARP_FILTER;
2070
2071 sdata->vif.bss_conf.qos = false;
2072 changed |= BSS_CHANGED_QOS;
2073
2074 /* The BSSID (not really interesting) and HT changed */
2075 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
2076 ieee80211_bss_info_change_notify(sdata, changed);
2077
2078 /* disassociated - set to defaults now */
2079 ieee80211_set_wmm_default(sdata, false, false);
2080
2081 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
2082 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
2083 del_timer_sync(&sdata->u.mgd.timer);
2084 del_timer_sync(&sdata->u.mgd.chswitch_timer);
2085
2086 sdata->vif.bss_conf.dtim_period = 0;
2087 sdata->vif.bss_conf.beacon_rate = NULL;
2088
2089 ifmgd->have_beacon = false;
2090
2091 ifmgd->flags = 0;
2092 mutex_lock(&local->mtx);
2093 ieee80211_vif_release_channel(sdata);
2094
2095 sdata->vif.csa_active = false;
2096 ifmgd->csa_waiting_bcn = false;
2097 ifmgd->csa_ignored_same_chan = false;
2098 if (sdata->csa_block_tx) {
2099 ieee80211_wake_vif_queues(local, sdata,
2100 IEEE80211_QUEUE_STOP_REASON_CSA);
2101 sdata->csa_block_tx = false;
2102 }
2103 mutex_unlock(&local->mtx);
2104
2105 /* existing TX TSPEC sessions no longer exist */
2106 memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
2107 cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);
2108
2109 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2110 }
2111
2112 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
2113 struct ieee80211_hdr *hdr)
2114 {
2115 /*
2116 * We can postpone the mgd.timer whenever receiving unicast frames
2117 * from AP because we know that the connection is working both ways
2118 * at that time. But multicast frames (and hence also beacons) must
2119 * be ignored here, because we need to trigger the timer during
2120 * data idle periods for sending the periodic probe request to the
2121 * AP we're connected to.
2122 */
2123 if (is_multicast_ether_addr(hdr->addr1))
2124 return;
2125
2126 ieee80211_sta_reset_conn_monitor(sdata);
2127 }
2128
2129 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
2130 {
2131 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2132 struct ieee80211_local *local = sdata->local;
2133
2134 mutex_lock(&local->mtx);
2135 if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
2136 goto out;
2137
2138 __ieee80211_stop_poll(sdata);
2139
2140 mutex_lock(&local->iflist_mtx);
2141 ieee80211_recalc_ps(local);
2142 mutex_unlock(&local->iflist_mtx);
2143
2144 if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
2145 goto out;
2146
2147 /*
2148 * We've received a probe response, but are not sure whether
2149 * we have or will be receiving any beacons or data, so let's
2150 * schedule the timers again, just in case.
2151 */
2152 ieee80211_sta_reset_beacon_monitor(sdata);
2153
2154 mod_timer(&ifmgd->conn_mon_timer,
2155 round_jiffies_up(jiffies +
2156 IEEE80211_CONNECTION_IDLE_TIME));
2157 out:
2158 mutex_unlock(&local->mtx);
2159 }
2160
2161 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
2162 struct ieee80211_hdr *hdr,
2163 u16 tx_time)
2164 {
2165 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2166 u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2167 int ac = ieee80211_ac_from_tid(tid);
2168 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
2169 unsigned long now = jiffies;
2170
2171 if (likely(!tx_tspec->admitted_time))
2172 return;
2173
2174 if (time_after(now, tx_tspec->time_slice_start + HZ)) {
2175 tx_tspec->consumed_tx_time = 0;
2176 tx_tspec->time_slice_start = now;
2177
2178 if (tx_tspec->downgraded) {
2179 tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE;
2180 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2181 }
2182 }
2183
2184 if (tx_tspec->downgraded)
2185 return;
2186
2187 tx_tspec->consumed_tx_time += tx_time;
2188
2189 if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) {
2190 tx_tspec->downgraded = true;
2191 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE;
2192 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2193 }
2194 }
2195
2196 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2197 struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2198 {
2199 ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);
2200
2201 if (!ieee80211_is_data(hdr->frame_control))
2202 return;
2203
2204 if (ieee80211_is_nullfunc(hdr->frame_control) &&
2205 sdata->u.mgd.probe_send_count > 0) {
2206 if (ack)
2207 ieee80211_sta_reset_conn_monitor(sdata);
2208 else
2209 sdata->u.mgd.nullfunc_failed = true;
2210 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2211 return;
2212 }
2213
2214 if (ack)
2215 ieee80211_sta_reset_conn_monitor(sdata);
2216 }
2217
2218 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
2219 {
2220 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2221 const u8 *ssid;
2222 u8 *dst = ifmgd->associated->bssid;
2223 u8 unicast_limit = max(1, max_probe_tries - 3);
2224 struct sta_info *sta;
2225
2226 /*
2227 * Try sending broadcast probe requests for the last three
2228 * probe requests after the first ones failed since some
2229 * buggy APs only support broadcast probe requests.
2230 */
2231 if (ifmgd->probe_send_count >= unicast_limit)
2232 dst = NULL;
2233
2234 /*
2235 * When the hardware reports an accurate Tx ACK status, it's
2236 * better to send a nullfunc frame instead of a probe request,
2237 * as it will kick us off the AP quickly if we aren't associated
2238 * anymore. The timeout will be reset if the frame is ACKed by
2239 * the AP.
2240 */
2241 ifmgd->probe_send_count++;
2242
2243 if (dst) {
2244 mutex_lock(&sdata->local->sta_mtx);
2245 sta = sta_info_get(sdata, dst);
2246 if (!WARN_ON(!sta))
2247 ieee80211_check_fast_rx(sta);
2248 mutex_unlock(&sdata->local->sta_mtx);
2249 }
2250
2251 if (ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
2252 ifmgd->nullfunc_failed = false;
2253 ieee80211_send_nullfunc(sdata->local, sdata, false);
2254 } else {
2255 int ssid_len;
2256
2257 rcu_read_lock();
2258 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2259 if (WARN_ON_ONCE(ssid == NULL))
2260 ssid_len = 0;
2261 else
2262 ssid_len = ssid[1];
2263
2264 ieee80211_send_probe_req(sdata, sdata->vif.addr, dst,
2265 ssid + 2, ssid_len, NULL,
2266 0, (u32) -1, true, 0,
2267 ifmgd->associated->channel, false);
2268 rcu_read_unlock();
2269 }
2270
2271 ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2272 run_again(sdata, ifmgd->probe_timeout);
2273 }
2274
2275 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
2276 bool beacon)
2277 {
2278 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2279 bool already = false;
2280
2281 if (!ieee80211_sdata_running(sdata))
2282 return;
2283
2284 sdata_lock(sdata);
2285
2286 if (!ifmgd->associated)
2287 goto out;
2288
2289 mutex_lock(&sdata->local->mtx);
2290
2291 if (sdata->local->tmp_channel || sdata->local->scanning) {
2292 mutex_unlock(&sdata->local->mtx);
2293 goto out;
2294 }
2295
2296 if (beacon) {
2297 mlme_dbg_ratelimited(sdata,
2298 "detected beacon loss from AP (missed %d beacons) - probing\n",
2299 beacon_loss_count);
2300
2301 ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL);
2302 }
2303
2304 /*
2305 * The driver/our work has already reported this event or the
2306 * connection monitoring has kicked in and we have already sent
2307 * a probe request. Or maybe the AP died and the driver keeps
2308 * reporting until we disassociate...
2309 *
2310 * In either case we have to ignore the current call to this
2311 * function (except for setting the correct probe reason bit)
2312 * because otherwise we would reset the timer every time and
2313 * never check whether we received a probe response!
2314 */
2315 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
2316 already = true;
2317
2318 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2319
2320 mutex_unlock(&sdata->local->mtx);
2321
2322 if (already)
2323 goto out;
2324
2325 mutex_lock(&sdata->local->iflist_mtx);
2326 ieee80211_recalc_ps(sdata->local);
2327 mutex_unlock(&sdata->local->iflist_mtx);
2328
2329 ifmgd->probe_send_count = 0;
2330 ieee80211_mgd_probe_ap_send(sdata);
2331 out:
2332 sdata_unlock(sdata);
2333 }
2334
2335 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2336 struct ieee80211_vif *vif)
2337 {
2338 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2339 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2340 struct cfg80211_bss *cbss;
2341 struct sk_buff *skb;
2342 const u8 *ssid;
2343 int ssid_len;
2344
2345 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2346 return NULL;
2347
2348 sdata_assert_lock(sdata);
2349
2350 if (ifmgd->associated)
2351 cbss = ifmgd->associated;
2352 else if (ifmgd->auth_data)
2353 cbss = ifmgd->auth_data->bss;
2354 else if (ifmgd->assoc_data)
2355 cbss = ifmgd->assoc_data->bss;
2356 else
2357 return NULL;
2358
2359 rcu_read_lock();
2360 ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2361 if (WARN_ON_ONCE(ssid == NULL))
2362 ssid_len = 0;
2363 else
2364 ssid_len = ssid[1];
2365
2366 skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
2367 (u32) -1, cbss->channel,
2368 ssid + 2, ssid_len,
2369 NULL, 0, true);
2370 rcu_read_unlock();
2371
2372 return skb;
2373 }
2374 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2375
2376 static void ieee80211_report_disconnect(struct ieee80211_sub_if_data *sdata,
2377 const u8 *buf, size_t len, bool tx,
2378 u16 reason)
2379 {
2380 struct ieee80211_event event = {
2381 .type = MLME_EVENT,
2382 .u.mlme.data = tx ? DEAUTH_TX_EVENT : DEAUTH_RX_EVENT,
2383 .u.mlme.reason = reason,
2384 };
2385
2386 if (tx)
2387 cfg80211_tx_mlme_mgmt(sdata->dev, buf, len);
2388 else
2389 cfg80211_rx_mlme_mgmt(sdata->dev, buf, len);
2390
2391 drv_event_callback(sdata->local, sdata, &event);
2392 }
2393
2394 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2395 {
2396 struct ieee80211_local *local = sdata->local;
2397 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2398 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2399
2400 sdata_lock(sdata);
2401 if (!ifmgd->associated) {
2402 sdata_unlock(sdata);
2403 return;
2404 }
2405
2406 /* AP is probably out of range (or not reachable for another reason) so
2407 * remove the bss struct for that AP.
2408 */
2409 cfg80211_unlink_bss(local->hw.wiphy, ifmgd->associated);
2410
2411 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2412 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2413 true, frame_buf);
2414 mutex_lock(&local->mtx);
2415 sdata->vif.csa_active = false;
2416 ifmgd->csa_waiting_bcn = false;
2417 if (sdata->csa_block_tx) {
2418 ieee80211_wake_vif_queues(local, sdata,
2419 IEEE80211_QUEUE_STOP_REASON_CSA);
2420 sdata->csa_block_tx = false;
2421 }
2422 mutex_unlock(&local->mtx);
2423
2424 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
2425 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2426
2427 sdata_unlock(sdata);
2428 }
2429
2430 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2431 {
2432 struct ieee80211_sub_if_data *sdata =
2433 container_of(work, struct ieee80211_sub_if_data,
2434 u.mgd.beacon_connection_loss_work);
2435 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2436
2437 if (ifmgd->associated)
2438 ifmgd->beacon_loss_count++;
2439
2440 if (ifmgd->connection_loss) {
2441 sdata_info(sdata, "Connection to AP %pM lost\n",
2442 ifmgd->bssid);
2443 __ieee80211_disconnect(sdata);
2444 } else {
2445 ieee80211_mgd_probe_ap(sdata, true);
2446 }
2447 }
2448
2449 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2450 {
2451 struct ieee80211_sub_if_data *sdata =
2452 container_of(work, struct ieee80211_sub_if_data,
2453 u.mgd.csa_connection_drop_work);
2454
2455 __ieee80211_disconnect(sdata);
2456 }
2457
2458 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2459 {
2460 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2461 struct ieee80211_hw *hw = &sdata->local->hw;
2462
2463 trace_api_beacon_loss(sdata);
2464
2465 sdata->u.mgd.connection_loss = false;
2466 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2467 }
2468 EXPORT_SYMBOL(ieee80211_beacon_loss);
2469
2470 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2471 {
2472 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2473 struct ieee80211_hw *hw = &sdata->local->hw;
2474
2475 trace_api_connection_loss(sdata);
2476
2477 sdata->u.mgd.connection_loss = true;
2478 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2479 }
2480 EXPORT_SYMBOL(ieee80211_connection_loss);
2481
2482
2483 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2484 bool assoc)
2485 {
2486 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2487
2488 sdata_assert_lock(sdata);
2489
2490 if (!assoc) {
2491 /*
2492 * we are not authenticated yet, the only timer that could be
2493 * running is the timeout for the authentication response which
2494 * which is not relevant anymore.
2495 */
2496 del_timer_sync(&sdata->u.mgd.timer);
2497 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2498
2499 eth_zero_addr(sdata->u.mgd.bssid);
2500 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2501 sdata->u.mgd.flags = 0;
2502 mutex_lock(&sdata->local->mtx);
2503 ieee80211_vif_release_channel(sdata);
2504 mutex_unlock(&sdata->local->mtx);
2505 }
2506
2507 cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2508 kfree(auth_data);
2509 sdata->u.mgd.auth_data = NULL;
2510 }
2511
2512 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2513 bool assoc)
2514 {
2515 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2516
2517 sdata_assert_lock(sdata);
2518
2519 if (!assoc) {
2520 /*
2521 * we are not associated yet, the only timer that could be
2522 * running is the timeout for the association response which
2523 * which is not relevant anymore.
2524 */
2525 del_timer_sync(&sdata->u.mgd.timer);
2526 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2527
2528 eth_zero_addr(sdata->u.mgd.bssid);
2529 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2530 sdata->u.mgd.flags = 0;
2531 sdata->vif.mu_mimo_owner = false;
2532
2533 mutex_lock(&sdata->local->mtx);
2534 ieee80211_vif_release_channel(sdata);
2535 mutex_unlock(&sdata->local->mtx);
2536 }
2537
2538 kfree(assoc_data);
2539 sdata->u.mgd.assoc_data = NULL;
2540 }
2541
2542 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2543 struct ieee80211_mgmt *mgmt, size_t len)
2544 {
2545 struct ieee80211_local *local = sdata->local;
2546 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2547 u8 *pos;
2548 struct ieee802_11_elems elems;
2549 u32 tx_flags = 0;
2550
2551 pos = mgmt->u.auth.variable;
2552 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2553 if (!elems.challenge)
2554 return;
2555 auth_data->expected_transaction = 4;
2556 drv_mgd_prepare_tx(sdata->local, sdata);
2557 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
2558 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2559 IEEE80211_TX_INTFL_MLME_CONN_TX;
2560 ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2561 elems.challenge - 2, elems.challenge_len + 2,
2562 auth_data->bss->bssid, auth_data->bss->bssid,
2563 auth_data->key, auth_data->key_len,
2564 auth_data->key_idx, tx_flags);
2565 }
2566
2567 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2568 struct ieee80211_mgmt *mgmt, size_t len)
2569 {
2570 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2571 u8 bssid[ETH_ALEN];
2572 u16 auth_alg, auth_transaction, status_code;
2573 struct sta_info *sta;
2574 struct ieee80211_event event = {
2575 .type = MLME_EVENT,
2576 .u.mlme.data = AUTH_EVENT,
2577 };
2578
2579 sdata_assert_lock(sdata);
2580
2581 if (len < 24 + 6)
2582 return;
2583
2584 if (!ifmgd->auth_data || ifmgd->auth_data->done)
2585 return;
2586
2587 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2588
2589 if (!ether_addr_equal(bssid, mgmt->bssid))
2590 return;
2591
2592 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2593 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2594 status_code = le16_to_cpu(mgmt->u.auth.status_code);
2595
2596 if (auth_alg != ifmgd->auth_data->algorithm ||
2597 auth_transaction != ifmgd->auth_data->expected_transaction) {
2598 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2599 mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2600 auth_transaction,
2601 ifmgd->auth_data->expected_transaction);
2602 return;
2603 }
2604
2605 if (status_code != WLAN_STATUS_SUCCESS) {
2606 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2607 mgmt->sa, status_code);
2608 ieee80211_destroy_auth_data(sdata, false);
2609 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2610 event.u.mlme.status = MLME_DENIED;
2611 event.u.mlme.reason = status_code;
2612 drv_event_callback(sdata->local, sdata, &event);
2613 return;
2614 }
2615
2616 switch (ifmgd->auth_data->algorithm) {
2617 case WLAN_AUTH_OPEN:
2618 case WLAN_AUTH_LEAP:
2619 case WLAN_AUTH_FT:
2620 case WLAN_AUTH_SAE:
2621 break;
2622 case WLAN_AUTH_SHARED_KEY:
2623 if (ifmgd->auth_data->expected_transaction != 4) {
2624 ieee80211_auth_challenge(sdata, mgmt, len);
2625 /* need another frame */
2626 return;
2627 }
2628 break;
2629 default:
2630 WARN_ONCE(1, "invalid auth alg %d",
2631 ifmgd->auth_data->algorithm);
2632 return;
2633 }
2634
2635 event.u.mlme.status = MLME_SUCCESS;
2636 drv_event_callback(sdata->local, sdata, &event);
2637 sdata_info(sdata, "authenticated\n");
2638 ifmgd->auth_data->done = true;
2639 ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2640 ifmgd->auth_data->timeout_started = true;
2641 run_again(sdata, ifmgd->auth_data->timeout);
2642
2643 if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2644 ifmgd->auth_data->expected_transaction != 2) {
2645 /*
2646 * Report auth frame to user space for processing since another
2647 * round of Authentication frames is still needed.
2648 */
2649 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2650 return;
2651 }
2652
2653 /* move station state to auth */
2654 mutex_lock(&sdata->local->sta_mtx);
2655 sta = sta_info_get(sdata, bssid);
2656 if (!sta) {
2657 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2658 goto out_err;
2659 }
2660 if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2661 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2662 goto out_err;
2663 }
2664 mutex_unlock(&sdata->local->sta_mtx);
2665
2666 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2667 return;
2668 out_err:
2669 mutex_unlock(&sdata->local->sta_mtx);
2670 /* ignore frame -- wait for timeout */
2671 }
2672
2673 #define case_WLAN(type) \
2674 case WLAN_REASON_##type: return #type
2675
2676 static const char *ieee80211_get_reason_code_string(u16 reason_code)
2677 {
2678 switch (reason_code) {
2679 case_WLAN(UNSPECIFIED);
2680 case_WLAN(PREV_AUTH_NOT_VALID);
2681 case_WLAN(DEAUTH_LEAVING);
2682 case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2683 case_WLAN(DISASSOC_AP_BUSY);
2684 case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2685 case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2686 case_WLAN(DISASSOC_STA_HAS_LEFT);
2687 case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2688 case_WLAN(DISASSOC_BAD_POWER);
2689 case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2690 case_WLAN(INVALID_IE);
2691 case_WLAN(MIC_FAILURE);
2692 case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2693 case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2694 case_WLAN(IE_DIFFERENT);
2695 case_WLAN(INVALID_GROUP_CIPHER);
2696 case_WLAN(INVALID_PAIRWISE_CIPHER);
2697 case_WLAN(INVALID_AKMP);
2698 case_WLAN(UNSUPP_RSN_VERSION);
2699 case_WLAN(INVALID_RSN_IE_CAP);
2700 case_WLAN(IEEE8021X_FAILED);
2701 case_WLAN(CIPHER_SUITE_REJECTED);
2702 case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2703 case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2704 case_WLAN(DISASSOC_LOW_ACK);
2705 case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2706 case_WLAN(QSTA_LEAVE_QBSS);
2707 case_WLAN(QSTA_NOT_USE);
2708 case_WLAN(QSTA_REQUIRE_SETUP);
2709 case_WLAN(QSTA_TIMEOUT);
2710 case_WLAN(QSTA_CIPHER_NOT_SUPP);
2711 case_WLAN(MESH_PEER_CANCELED);
2712 case_WLAN(MESH_MAX_PEERS);
2713 case_WLAN(MESH_CONFIG);
2714 case_WLAN(MESH_CLOSE);
2715 case_WLAN(MESH_MAX_RETRIES);
2716 case_WLAN(MESH_CONFIRM_TIMEOUT);
2717 case_WLAN(MESH_INVALID_GTK);
2718 case_WLAN(MESH_INCONSISTENT_PARAM);
2719 case_WLAN(MESH_INVALID_SECURITY);
2720 case_WLAN(MESH_PATH_ERROR);
2721 case_WLAN(MESH_PATH_NOFORWARD);
2722 case_WLAN(MESH_PATH_DEST_UNREACHABLE);
2723 case_WLAN(MAC_EXISTS_IN_MBSS);
2724 case_WLAN(MESH_CHAN_REGULATORY);
2725 case_WLAN(MESH_CHAN);
2726 default: return "<unknown>";
2727 }
2728 }
2729
2730 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2731 struct ieee80211_mgmt *mgmt, size_t len)
2732 {
2733 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2734 u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2735
2736 sdata_assert_lock(sdata);
2737
2738 if (len < 24 + 2)
2739 return;
2740
2741 if (ifmgd->associated &&
2742 ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) {
2743 const u8 *bssid = ifmgd->associated->bssid;
2744
2745 sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
2746 bssid, reason_code,
2747 ieee80211_get_reason_code_string(reason_code));
2748
2749 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2750
2751 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false,
2752 reason_code);
2753 return;
2754 }
2755
2756 if (ifmgd->assoc_data &&
2757 ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2758 const u8 *bssid = ifmgd->assoc_data->bss->bssid;
2759
2760 sdata_info(sdata,
2761 "deauthenticated from %pM while associating (Reason: %u=%s)\n",
2762 bssid, reason_code,
2763 ieee80211_get_reason_code_string(reason_code));
2764
2765 ieee80211_destroy_assoc_data(sdata, false);
2766
2767 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2768 return;
2769 }
2770 }
2771
2772
2773 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2774 struct ieee80211_mgmt *mgmt, size_t len)
2775 {
2776 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2777 u16 reason_code;
2778
2779 sdata_assert_lock(sdata);
2780
2781 if (len < 24 + 2)
2782 return;
2783
2784 if (!ifmgd->associated ||
2785 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2786 return;
2787
2788 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2789
2790 sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2791 mgmt->sa, reason_code);
2792
2793 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2794
2795 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code);
2796 }
2797
2798 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2799 u8 *supp_rates, unsigned int supp_rates_len,
2800 u32 *rates, u32 *basic_rates,
2801 bool *have_higher_than_11mbit,
2802 int *min_rate, int *min_rate_index,
2803 int shift, u32 rate_flags)
2804 {
2805 int i, j;
2806
2807 for (i = 0; i < supp_rates_len; i++) {
2808 int rate = supp_rates[i] & 0x7f;
2809 bool is_basic = !!(supp_rates[i] & 0x80);
2810
2811 if ((rate * 5 * (1 << shift)) > 110)
2812 *have_higher_than_11mbit = true;
2813
2814 /*
2815 * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2816 * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2817 *
2818 * Note: Even through the membership selector and the basic
2819 * rate flag share the same bit, they are not exactly
2820 * the same.
2821 */
2822 if (!!(supp_rates[i] & 0x80) &&
2823 (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2824 continue;
2825
2826 for (j = 0; j < sband->n_bitrates; j++) {
2827 struct ieee80211_rate *br;
2828 int brate;
2829
2830 br = &sband->bitrates[j];
2831 if ((rate_flags & br->flags) != rate_flags)
2832 continue;
2833
2834 brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2835 if (brate == rate) {
2836 *rates |= BIT(j);
2837 if (is_basic)
2838 *basic_rates |= BIT(j);
2839 if ((rate * 5) < *min_rate) {
2840 *min_rate = rate * 5;
2841 *min_rate_index = j;
2842 }
2843 break;
2844 }
2845 }
2846 }
2847 }
2848
2849 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2850 struct cfg80211_bss *cbss,
2851 struct ieee80211_mgmt *mgmt, size_t len)
2852 {
2853 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2854 struct ieee80211_local *local = sdata->local;
2855 struct ieee80211_supported_band *sband;
2856 struct sta_info *sta;
2857 u8 *pos;
2858 u16 capab_info, aid;
2859 struct ieee802_11_elems elems;
2860 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2861 const struct cfg80211_bss_ies *bss_ies = NULL;
2862 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2863 u32 changed = 0;
2864 int err;
2865 bool ret;
2866
2867 /* AssocResp and ReassocResp have identical structure */
2868
2869 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2870 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2871
2872 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2873 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2874 aid);
2875 aid &= ~(BIT(15) | BIT(14));
2876
2877 ifmgd->broken_ap = false;
2878
2879 if (aid == 0 || aid > IEEE80211_MAX_AID) {
2880 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2881 aid);
2882 aid = 0;
2883 ifmgd->broken_ap = true;
2884 }
2885
2886 pos = mgmt->u.assoc_resp.variable;
2887 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2888
2889 if (!elems.supp_rates) {
2890 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2891 return false;
2892 }
2893
2894 ifmgd->aid = aid;
2895 ifmgd->tdls_chan_switch_prohibited =
2896 elems.ext_capab && elems.ext_capab_len >= 5 &&
2897 (elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
2898
2899 /*
2900 * Some APs are erroneously not including some information in their
2901 * (re)association response frames. Try to recover by using the data
2902 * from the beacon or probe response. This seems to afflict mobile
2903 * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2904 * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2905 */
2906 if ((assoc_data->wmm && !elems.wmm_param) ||
2907 (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2908 (!elems.ht_cap_elem || !elems.ht_operation)) ||
2909 (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2910 (!elems.vht_cap_elem || !elems.vht_operation))) {
2911 const struct cfg80211_bss_ies *ies;
2912 struct ieee802_11_elems bss_elems;
2913
2914 rcu_read_lock();
2915 ies = rcu_dereference(cbss->ies);
2916 if (ies)
2917 bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2918 GFP_ATOMIC);
2919 rcu_read_unlock();
2920 if (!bss_ies)
2921 return false;
2922
2923 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2924 false, &bss_elems);
2925 if (assoc_data->wmm &&
2926 !elems.wmm_param && bss_elems.wmm_param) {
2927 elems.wmm_param = bss_elems.wmm_param;
2928 sdata_info(sdata,
2929 "AP bug: WMM param missing from AssocResp\n");
2930 }
2931
2932 /*
2933 * Also check if we requested HT/VHT, otherwise the AP doesn't
2934 * have to include the IEs in the (re)association response.
2935 */
2936 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2937 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2938 elems.ht_cap_elem = bss_elems.ht_cap_elem;
2939 sdata_info(sdata,
2940 "AP bug: HT capability missing from AssocResp\n");
2941 }
2942 if (!elems.ht_operation && bss_elems.ht_operation &&
2943 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2944 elems.ht_operation = bss_elems.ht_operation;
2945 sdata_info(sdata,
2946 "AP bug: HT operation missing from AssocResp\n");
2947 }
2948 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2949 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2950 elems.vht_cap_elem = bss_elems.vht_cap_elem;
2951 sdata_info(sdata,
2952 "AP bug: VHT capa missing from AssocResp\n");
2953 }
2954 if (!elems.vht_operation && bss_elems.vht_operation &&
2955 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2956 elems.vht_operation = bss_elems.vht_operation;
2957 sdata_info(sdata,
2958 "AP bug: VHT operation missing from AssocResp\n");
2959 }
2960 }
2961
2962 /*
2963 * We previously checked these in the beacon/probe response, so
2964 * they should be present here. This is just a safety net.
2965 */
2966 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2967 (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2968 sdata_info(sdata,
2969 "HT AP is missing WMM params or HT capability/operation\n");
2970 ret = false;
2971 goto out;
2972 }
2973
2974 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2975 (!elems.vht_cap_elem || !elems.vht_operation)) {
2976 sdata_info(sdata,
2977 "VHT AP is missing VHT capability/operation\n");
2978 ret = false;
2979 goto out;
2980 }
2981
2982 mutex_lock(&sdata->local->sta_mtx);
2983 /*
2984 * station info was already allocated and inserted before
2985 * the association and should be available to us
2986 */
2987 sta = sta_info_get(sdata, cbss->bssid);
2988 if (WARN_ON(!sta)) {
2989 mutex_unlock(&sdata->local->sta_mtx);
2990 ret = false;
2991 goto out;
2992 }
2993
2994 sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2995
2996 /* Set up internal HT/VHT capabilities */
2997 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2998 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2999 elems.ht_cap_elem, sta);
3000
3001 if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
3002 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
3003 elems.vht_cap_elem, sta);
3004
3005 /*
3006 * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
3007 * in their association response, so ignore that data for our own
3008 * configuration. If it changed since the last beacon, we'll get the
3009 * next beacon and update then.
3010 */
3011
3012 /*
3013 * If an operating mode notification IE is present, override the
3014 * NSS calculation (that would be done in rate_control_rate_init())
3015 * and use the # of streams from that element.
3016 */
3017 if (elems.opmode_notif &&
3018 !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
3019 u8 nss;
3020
3021 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
3022 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
3023 nss += 1;
3024 sta->sta.rx_nss = nss;
3025 }
3026
3027 rate_control_rate_init(sta);
3028
3029 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) {
3030 set_sta_flag(sta, WLAN_STA_MFP);
3031 sta->sta.mfp = true;
3032 } else {
3033 sta->sta.mfp = false;
3034 }
3035
3036 sta->sta.wme = elems.wmm_param && local->hw.queues >= IEEE80211_NUM_ACS;
3037
3038 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
3039 if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
3040 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
3041 if (err) {
3042 sdata_info(sdata,
3043 "failed to move station %pM to desired state\n",
3044 sta->sta.addr);
3045 WARN_ON(__sta_info_destroy(sta));
3046 mutex_unlock(&sdata->local->sta_mtx);
3047 ret = false;
3048 goto out;
3049 }
3050
3051 mutex_unlock(&sdata->local->sta_mtx);
3052
3053 /*
3054 * Always handle WMM once after association regardless
3055 * of the first value the AP uses. Setting -1 here has
3056 * that effect because the AP values is an unsigned
3057 * 4-bit value.
3058 */
3059 ifmgd->wmm_last_param_set = -1;
3060
3061 if (ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
3062 ieee80211_set_wmm_default(sdata, false, false);
3063 } else if (!ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3064 elems.wmm_param_len)) {
3065 /* still enable QoS since we might have HT/VHT */
3066 ieee80211_set_wmm_default(sdata, false, true);
3067 /* set the disable-WMM flag in this case to disable
3068 * tracking WMM parameter changes in the beacon if
3069 * the parameters weren't actually valid. Doing so
3070 * avoids changing parameters very strangely when
3071 * the AP is going back and forth between valid and
3072 * invalid parameters.
3073 */
3074 ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
3075 }
3076 changed |= BSS_CHANGED_QOS;
3077
3078 /* set AID and assoc capability,
3079 * ieee80211_set_associated() will tell the driver */
3080 bss_conf->aid = aid;
3081 bss_conf->assoc_capability = capab_info;
3082 ieee80211_set_associated(sdata, cbss, changed);
3083
3084 /*
3085 * If we're using 4-addr mode, let the AP know that we're
3086 * doing so, so that it can create the STA VLAN on its side
3087 */
3088 if (ifmgd->use_4addr)
3089 ieee80211_send_4addr_nullfunc(local, sdata);
3090
3091 /*
3092 * Start timer to probe the connection to the AP now.
3093 * Also start the timer that will detect beacon loss.
3094 */
3095 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
3096 ieee80211_sta_reset_beacon_monitor(sdata);
3097
3098 ret = true;
3099 out:
3100 kfree(bss_ies);
3101 return ret;
3102 }
3103
3104 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
3105 struct ieee80211_mgmt *mgmt,
3106 size_t len)
3107 {
3108 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3109 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
3110 u16 capab_info, status_code, aid;
3111 struct ieee802_11_elems elems;
3112 int ac, uapsd_queues = -1;
3113 u8 *pos;
3114 bool reassoc;
3115 struct cfg80211_bss *bss;
3116 struct ieee80211_event event = {
3117 .type = MLME_EVENT,
3118 .u.mlme.data = ASSOC_EVENT,
3119 };
3120
3121 sdata_assert_lock(sdata);
3122
3123 if (!assoc_data)
3124 return;
3125 if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3126 return;
3127
3128 /*
3129 * AssocResp and ReassocResp have identical structure, so process both
3130 * of them in this function.
3131 */
3132
3133 if (len < 24 + 6)
3134 return;
3135
3136 reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
3137 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
3138 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
3139 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
3140
3141 sdata_info(sdata,
3142 "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
3143 reassoc ? "Rea" : "A", mgmt->sa,
3144 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
3145
3146 pos = mgmt->u.assoc_resp.variable;
3147 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
3148
3149 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3150 elems.timeout_int &&
3151 elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
3152 u32 tu, ms;
3153 tu = le32_to_cpu(elems.timeout_int->value);
3154 ms = tu * 1024 / 1000;
3155 sdata_info(sdata,
3156 "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
3157 mgmt->sa, tu, ms);
3158 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3159 assoc_data->timeout_started = true;
3160 if (ms > IEEE80211_ASSOC_TIMEOUT)
3161 run_again(sdata, assoc_data->timeout);
3162 return;
3163 }
3164
3165 bss = assoc_data->bss;
3166
3167 if (status_code != WLAN_STATUS_SUCCESS) {
3168 sdata_info(sdata, "%pM denied association (code=%d)\n",
3169 mgmt->sa, status_code);
3170 ieee80211_destroy_assoc_data(sdata, false);
3171 event.u.mlme.status = MLME_DENIED;
3172 event.u.mlme.reason = status_code;
3173 drv_event_callback(sdata->local, sdata, &event);
3174 } else {
3175 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
3176 /* oops -- internal error -- send timeout for now */
3177 ieee80211_destroy_assoc_data(sdata, false);
3178 cfg80211_assoc_timeout(sdata->dev, bss);
3179 return;
3180 }
3181 event.u.mlme.status = MLME_SUCCESS;
3182 drv_event_callback(sdata->local, sdata, &event);
3183 sdata_info(sdata, "associated\n");
3184
3185 /*
3186 * destroy assoc_data afterwards, as otherwise an idle
3187 * recalc after assoc_data is NULL but before associated
3188 * is set can cause the interface to go idle
3189 */
3190 ieee80211_destroy_assoc_data(sdata, true);
3191
3192 /* get uapsd queues configuration */
3193 uapsd_queues = 0;
3194 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
3195 if (sdata->tx_conf[ac].uapsd)
3196 uapsd_queues |= BIT(ac);
3197 }
3198
3199 cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
3200 }
3201
3202 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
3203 struct ieee80211_mgmt *mgmt, size_t len,
3204 struct ieee80211_rx_status *rx_status,
3205 struct ieee802_11_elems *elems)
3206 {
3207 struct ieee80211_local *local = sdata->local;
3208 struct ieee80211_bss *bss;
3209 struct ieee80211_channel *channel;
3210
3211 sdata_assert_lock(sdata);
3212
3213 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
3214 if (!channel)
3215 return;
3216
3217 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3218 channel);
3219 if (bss) {
3220 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3221 ieee80211_rx_bss_put(local, bss);
3222 }
3223 }
3224
3225
3226 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
3227 struct sk_buff *skb)
3228 {
3229 struct ieee80211_mgmt *mgmt = (void *)skb->data;
3230 struct ieee80211_if_managed *ifmgd;
3231 struct ieee80211_rx_status *rx_status = (void *) skb->cb;
3232 size_t baselen, len = skb->len;
3233 struct ieee802_11_elems elems;
3234
3235 ifmgd = &sdata->u.mgd;
3236
3237 sdata_assert_lock(sdata);
3238
3239 if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3240 return; /* ignore ProbeResp to foreign address */
3241
3242 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
3243 if (baselen > len)
3244 return;
3245
3246 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3247 false, &elems);
3248
3249 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3250
3251 if (ifmgd->associated &&
3252 ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3253 ieee80211_reset_ap_probe(sdata);
3254 }
3255
3256 /*
3257 * This is the canonical list of information elements we care about,
3258 * the filter code also gives us all changes to the Microsoft OUI
3259 * (00:50:F2) vendor IE which is used for WMM which we need to track,
3260 * as well as the DTPC IE (part of the Cisco OUI) used for signaling
3261 * changes to requested client power.
3262 *
3263 * We implement beacon filtering in software since that means we can
3264 * avoid processing the frame here and in cfg80211, and userspace
3265 * will not be able to tell whether the hardware supports it or not.
3266 *
3267 * XXX: This list needs to be dynamic -- userspace needs to be able to
3268 * add items it requires. It also needs to be able to tell us to
3269 * look out for other vendor IEs.
3270 */
3271 static const u64 care_about_ies =
3272 (1ULL << WLAN_EID_COUNTRY) |
3273 (1ULL << WLAN_EID_ERP_INFO) |
3274 (1ULL << WLAN_EID_CHANNEL_SWITCH) |
3275 (1ULL << WLAN_EID_PWR_CONSTRAINT) |
3276 (1ULL << WLAN_EID_HT_CAPABILITY) |
3277 (1ULL << WLAN_EID_HT_OPERATION) |
3278 (1ULL << WLAN_EID_EXT_CHANSWITCH_ANN);
3279
3280 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
3281 struct ieee80211_mgmt *mgmt, size_t len,
3282 struct ieee80211_rx_status *rx_status)
3283 {
3284 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3285 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3286 size_t baselen;
3287 struct ieee802_11_elems elems;
3288 struct ieee80211_local *local = sdata->local;
3289 struct ieee80211_chanctx_conf *chanctx_conf;
3290 struct ieee80211_channel *chan;
3291 struct sta_info *sta;
3292 u32 changed = 0;
3293 bool erp_valid;
3294 u8 erp_value = 0;
3295 u32 ncrc;
3296 u8 *bssid;
3297 u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3298
3299 sdata_assert_lock(sdata);
3300
3301 /* Process beacon from the current BSS */
3302 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
3303 if (baselen > len)
3304 return;
3305
3306 rcu_read_lock();
3307 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3308 if (!chanctx_conf) {
3309 rcu_read_unlock();
3310 return;
3311 }
3312
3313 if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
3314 rcu_read_unlock();
3315 return;
3316 }
3317 chan = chanctx_conf->def.chan;
3318 rcu_read_unlock();
3319
3320 if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3321 ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
3322 ieee802_11_parse_elems(mgmt->u.beacon.variable,
3323 len - baselen, false, &elems);
3324
3325 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3326 if (elems.tim && !elems.parse_error) {
3327 const struct ieee80211_tim_ie *tim_ie = elems.tim;
3328 ifmgd->dtim_period = tim_ie->dtim_period;
3329 }
3330 ifmgd->have_beacon = true;
3331 ifmgd->assoc_data->need_beacon = false;
3332 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3333 sdata->vif.bss_conf.sync_tsf =
3334 le64_to_cpu(mgmt->u.beacon.timestamp);
3335 sdata->vif.bss_conf.sync_device_ts =
3336 rx_status->device_timestamp;
3337 if (elems.tim)
3338 sdata->vif.bss_conf.sync_dtim_count =
3339 elems.tim->dtim_count;
3340 else
3341 sdata->vif.bss_conf.sync_dtim_count = 0;
3342 }
3343 /* continue assoc process */
3344 ifmgd->assoc_data->timeout = jiffies;
3345 ifmgd->assoc_data->timeout_started = true;
3346 run_again(sdata, ifmgd->assoc_data->timeout);
3347 return;
3348 }
3349
3350 if (!ifmgd->associated ||
3351 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3352 return;
3353 bssid = ifmgd->associated->bssid;
3354
3355 /* Track average RSSI from the Beacon frames of the current AP */
3356 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
3357 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3358 ewma_beacon_signal_init(&ifmgd->ave_beacon_signal);
3359 ifmgd->last_cqm_event_signal = 0;
3360 ifmgd->count_beacon_signal = 1;
3361 ifmgd->last_ave_beacon_signal = 0;
3362 } else {
3363 ifmgd->count_beacon_signal++;
3364 }
3365
3366 ewma_beacon_signal_add(&ifmgd->ave_beacon_signal, -rx_status->signal);
3367
3368 if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3369 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3370 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3371 int last_sig = ifmgd->last_ave_beacon_signal;
3372 struct ieee80211_event event = {
3373 .type = RSSI_EVENT,
3374 };
3375
3376 /*
3377 * if signal crosses either of the boundaries, invoke callback
3378 * with appropriate parameters
3379 */
3380 if (sig > ifmgd->rssi_max_thold &&
3381 (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3382 ifmgd->last_ave_beacon_signal = sig;
3383 event.u.rssi.data = RSSI_EVENT_HIGH;
3384 drv_event_callback(local, sdata, &event);
3385 } else if (sig < ifmgd->rssi_min_thold &&
3386 (last_sig >= ifmgd->rssi_max_thold ||
3387 last_sig == 0)) {
3388 ifmgd->last_ave_beacon_signal = sig;
3389 event.u.rssi.data = RSSI_EVENT_LOW;
3390 drv_event_callback(local, sdata, &event);
3391 }
3392 }
3393
3394 if (bss_conf->cqm_rssi_thold &&
3395 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3396 !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3397 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3398 int last_event = ifmgd->last_cqm_event_signal;
3399 int thold = bss_conf->cqm_rssi_thold;
3400 int hyst = bss_conf->cqm_rssi_hyst;
3401
3402 if (sig < thold &&
3403 (last_event == 0 || sig < last_event - hyst)) {
3404 ifmgd->last_cqm_event_signal = sig;
3405 ieee80211_cqm_rssi_notify(
3406 &sdata->vif,
3407 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3408 GFP_KERNEL);
3409 } else if (sig > thold &&
3410 (last_event == 0 || sig > last_event + hyst)) {
3411 ifmgd->last_cqm_event_signal = sig;
3412 ieee80211_cqm_rssi_notify(
3413 &sdata->vif,
3414 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3415 GFP_KERNEL);
3416 }
3417 }
3418
3419 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3420 mlme_dbg_ratelimited(sdata,
3421 "cancelling AP probe due to a received beacon\n");
3422 ieee80211_reset_ap_probe(sdata);
3423 }
3424
3425 /*
3426 * Push the beacon loss detection into the future since
3427 * we are processing a beacon from the AP just now.
3428 */
3429 ieee80211_sta_reset_beacon_monitor(sdata);
3430
3431 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3432 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3433 len - baselen, false, &elems,
3434 care_about_ies, ncrc);
3435
3436 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
3437 ieee80211_check_tim(elems.tim, elems.tim_len, ifmgd->aid)) {
3438 if (local->hw.conf.dynamic_ps_timeout > 0) {
3439 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3440 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3441 ieee80211_hw_config(local,
3442 IEEE80211_CONF_CHANGE_PS);
3443 }
3444 ieee80211_send_nullfunc(local, sdata, false);
3445 } else if (!local->pspolling && sdata->u.mgd.powersave) {
3446 local->pspolling = true;
3447
3448 /*
3449 * Here is assumed that the driver will be
3450 * able to send ps-poll frame and receive a
3451 * response even though power save mode is
3452 * enabled, but some drivers might require
3453 * to disable power save here. This needs
3454 * to be investigated.
3455 */
3456 ieee80211_send_pspoll(local, sdata);
3457 }
3458 }
3459
3460 if (sdata->vif.p2p ||
3461 sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) {
3462 struct ieee80211_p2p_noa_attr noa = {};
3463 int ret;
3464
3465 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3466 len - baselen,
3467 IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3468 (u8 *) &noa, sizeof(noa));
3469 if (ret >= 2) {
3470 if (sdata->u.mgd.p2p_noa_index != noa.index) {
3471 /* valid noa_attr and index changed */
3472 sdata->u.mgd.p2p_noa_index = noa.index;
3473 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3474 changed |= BSS_CHANGED_P2P_PS;
3475 /*
3476 * make sure we update all information, the CRC
3477 * mechanism doesn't look at P2P attributes.
3478 */
3479 ifmgd->beacon_crc_valid = false;
3480 }
3481 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3482 /* noa_attr not found and we had valid noa_attr before */
3483 sdata->u.mgd.p2p_noa_index = -1;
3484 memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3485 changed |= BSS_CHANGED_P2P_PS;
3486 ifmgd->beacon_crc_valid = false;
3487 }
3488 }
3489
3490 if (ifmgd->csa_waiting_bcn)
3491 ieee80211_chswitch_post_beacon(sdata);
3492
3493 /*
3494 * Update beacon timing and dtim count on every beacon appearance. This
3495 * will allow the driver to use the most updated values. Do it before
3496 * comparing this one with last received beacon.
3497 * IMPORTANT: These parameters would possibly be out of sync by the time
3498 * the driver will use them. The synchronized view is currently
3499 * guaranteed only in certain callbacks.
3500 */
3501 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3502 sdata->vif.bss_conf.sync_tsf =
3503 le64_to_cpu(mgmt->u.beacon.timestamp);
3504 sdata->vif.bss_conf.sync_device_ts =
3505 rx_status->device_timestamp;
3506 if (elems.tim)
3507 sdata->vif.bss_conf.sync_dtim_count =
3508 elems.tim->dtim_count;
3509 else
3510 sdata->vif.bss_conf.sync_dtim_count = 0;
3511 }
3512
3513 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3514 return;
3515 ifmgd->beacon_crc = ncrc;
3516 ifmgd->beacon_crc_valid = true;
3517
3518 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3519
3520 ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3521 rx_status->device_timestamp,
3522 &elems, true);
3523
3524 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3525 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3526 elems.wmm_param_len))
3527 changed |= BSS_CHANGED_QOS;
3528
3529 /*
3530 * If we haven't had a beacon before, tell the driver about the
3531 * DTIM period (and beacon timing if desired) now.
3532 */
3533 if (!ifmgd->have_beacon) {
3534 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3535 if (elems.tim)
3536 bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3537 else
3538 bss_conf->dtim_period = 1;
3539
3540 changed |= BSS_CHANGED_BEACON_INFO;
3541 ifmgd->have_beacon = true;
3542
3543 mutex_lock(&local->iflist_mtx);
3544 ieee80211_recalc_ps(local);
3545 mutex_unlock(&local->iflist_mtx);
3546
3547 ieee80211_recalc_ps_vif(sdata);
3548 }
3549
3550 if (elems.erp_info) {
3551 erp_valid = true;
3552 erp_value = elems.erp_info[0];
3553 } else {
3554 erp_valid = false;
3555 }
3556 changed |= ieee80211_handle_bss_capability(sdata,
3557 le16_to_cpu(mgmt->u.beacon.capab_info),
3558 erp_valid, erp_value);
3559
3560 mutex_lock(&local->sta_mtx);
3561 sta = sta_info_get(sdata, bssid);
3562
3563 if (ieee80211_config_bw(sdata, sta,
3564 elems.ht_cap_elem, elems.ht_operation,
3565 elems.vht_operation, bssid, &changed)) {
3566 mutex_unlock(&local->sta_mtx);
3567 sdata_info(sdata,
3568 "failed to follow AP %pM bandwidth change, disconnect\n",
3569 bssid);
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);
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 mlme_dbg(sdata,
3946 "No probe response from AP %pM after %dms, disconnecting.\n",
3947 bssid, probe_wait_ms);
3948
3949 ieee80211_sta_connection_lost(sdata, bssid,
3950 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3951 }
3952 }
3953
3954 sdata_unlock(sdata);
3955 }
3956
3957 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3958 {
3959 struct ieee80211_sub_if_data *sdata =
3960 (struct ieee80211_sub_if_data *) data;
3961 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3962
3963 if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3964 return;
3965
3966 sdata->u.mgd.connection_loss = false;
3967 ieee80211_queue_work(&sdata->local->hw,
3968 &sdata->u.mgd.beacon_connection_loss_work);
3969 }
3970
3971 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3972 {
3973 struct ieee80211_sub_if_data *sdata =
3974 (struct ieee80211_sub_if_data *) data;
3975 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3976 struct ieee80211_local *local = sdata->local;
3977
3978 if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3979 return;
3980
3981 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3982 }
3983
3984 static void ieee80211_sta_monitor_work(struct work_struct *work)
3985 {
3986 struct ieee80211_sub_if_data *sdata =
3987 container_of(work, struct ieee80211_sub_if_data,
3988 u.mgd.monitor_work);
3989
3990 ieee80211_mgd_probe_ap(sdata, false);
3991 }
3992
3993 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3994 {
3995 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3996 __ieee80211_stop_poll(sdata);
3997
3998 /* let's probe the connection once */
3999 if (!ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
4000 ieee80211_queue_work(&sdata->local->hw,
4001 &sdata->u.mgd.monitor_work);
4002 }
4003 }
4004
4005 #ifdef CONFIG_PM
4006 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
4007 {
4008 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4009 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4010
4011 sdata_lock(sdata);
4012
4013 if (ifmgd->auth_data || ifmgd->assoc_data) {
4014 const u8 *bssid = ifmgd->auth_data ?
4015 ifmgd->auth_data->bss->bssid :
4016 ifmgd->assoc_data->bss->bssid;
4017
4018 /*
4019 * If we are trying to authenticate / associate while suspending,
4020 * cfg80211 won't know and won't actually abort those attempts,
4021 * thus we need to do that ourselves.
4022 */
4023 ieee80211_send_deauth_disassoc(sdata, bssid,
4024 IEEE80211_STYPE_DEAUTH,
4025 WLAN_REASON_DEAUTH_LEAVING,
4026 false, frame_buf);
4027 if (ifmgd->assoc_data)
4028 ieee80211_destroy_assoc_data(sdata, false);
4029 if (ifmgd->auth_data)
4030 ieee80211_destroy_auth_data(sdata, false);
4031 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4032 IEEE80211_DEAUTH_FRAME_LEN);
4033 }
4034
4035 /* This is a bit of a hack - we should find a better and more generic
4036 * solution to this. Normally when suspending, cfg80211 will in fact
4037 * deauthenticate. However, it doesn't (and cannot) stop an ongoing
4038 * auth (not so important) or assoc (this is the problem) process.
4039 *
4040 * As a consequence, it can happen that we are in the process of both
4041 * associating and suspending, and receive an association response
4042 * after cfg80211 has checked if it needs to disconnect, but before
4043 * we actually set the flag to drop incoming frames. This will then
4044 * cause the workqueue flush to process the association response in
4045 * the suspend, resulting in a successful association just before it
4046 * tries to remove the interface from the driver, which now though
4047 * has a channel context assigned ... this results in issues.
4048 *
4049 * To work around this (for now) simply deauth here again if we're
4050 * now connected.
4051 */
4052 if (ifmgd->associated && !sdata->local->wowlan) {
4053 u8 bssid[ETH_ALEN];
4054 struct cfg80211_deauth_request req = {
4055 .reason_code = WLAN_REASON_DEAUTH_LEAVING,
4056 .bssid = bssid,
4057 };
4058
4059 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
4060 ieee80211_mgd_deauth(sdata, &req);
4061 }
4062
4063 sdata_unlock(sdata);
4064 }
4065
4066 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
4067 {
4068 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4069
4070 sdata_lock(sdata);
4071 if (!ifmgd->associated) {
4072 sdata_unlock(sdata);
4073 return;
4074 }
4075
4076 if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
4077 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
4078 mlme_dbg(sdata, "driver requested disconnect after resume\n");
4079 ieee80211_sta_connection_lost(sdata,
4080 ifmgd->associated->bssid,
4081 WLAN_REASON_UNSPECIFIED,
4082 true);
4083 sdata_unlock(sdata);
4084 return;
4085 }
4086 sdata_unlock(sdata);
4087 }
4088 #endif
4089
4090 /* interface setup */
4091 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
4092 {
4093 struct ieee80211_if_managed *ifmgd;
4094
4095 ifmgd = &sdata->u.mgd;
4096 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
4097 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
4098 INIT_WORK(&ifmgd->beacon_connection_loss_work,
4099 ieee80211_beacon_connection_loss_work);
4100 INIT_WORK(&ifmgd->csa_connection_drop_work,
4101 ieee80211_csa_connection_drop_work);
4102 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
4103 INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
4104 ieee80211_tdls_peer_del_work);
4105 setup_timer(&ifmgd->timer, ieee80211_sta_timer,
4106 (unsigned long) sdata);
4107 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
4108 (unsigned long) sdata);
4109 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
4110 (unsigned long) sdata);
4111 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
4112 (unsigned long) sdata);
4113 INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
4114 ieee80211_sta_handle_tspec_ac_params_wk);
4115
4116 ifmgd->flags = 0;
4117 ifmgd->powersave = sdata->wdev.ps;
4118 ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
4119 ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
4120 ifmgd->p2p_noa_index = -1;
4121
4122 if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4123 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
4124 else
4125 ifmgd->req_smps = IEEE80211_SMPS_OFF;
4126
4127 /* Setup TDLS data */
4128 spin_lock_init(&ifmgd->teardown_lock);
4129 ifmgd->teardown_skb = NULL;
4130 ifmgd->orig_teardown_skb = NULL;
4131 }
4132
4133 /* scan finished notification */
4134 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
4135 {
4136 struct ieee80211_sub_if_data *sdata;
4137
4138 /* Restart STA timers */
4139 rcu_read_lock();
4140 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4141 if (ieee80211_sdata_running(sdata))
4142 ieee80211_restart_sta_timer(sdata);
4143 }
4144 rcu_read_unlock();
4145 }
4146
4147 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
4148 struct cfg80211_bss *cbss)
4149 {
4150 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4151 const u8 *ht_cap_ie, *vht_cap_ie;
4152 const struct ieee80211_ht_cap *ht_cap;
4153 const struct ieee80211_vht_cap *vht_cap;
4154 u8 chains = 1;
4155
4156 if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
4157 return chains;
4158
4159 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4160 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
4161 ht_cap = (void *)(ht_cap_ie + 2);
4162 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
4163 /*
4164 * TODO: use "Tx Maximum Number Spatial Streams Supported" and
4165 * "Tx Unequal Modulation Supported" fields.
4166 */
4167 }
4168
4169 if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
4170 return chains;
4171
4172 vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4173 if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
4174 u8 nss;
4175 u16 tx_mcs_map;
4176
4177 vht_cap = (void *)(vht_cap_ie + 2);
4178 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
4179 for (nss = 8; nss > 0; nss--) {
4180 if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
4181 IEEE80211_VHT_MCS_NOT_SUPPORTED)
4182 break;
4183 }
4184 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
4185 chains = max(chains, nss);
4186 }
4187
4188 return chains;
4189 }
4190
4191 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
4192 struct cfg80211_bss *cbss)
4193 {
4194 struct ieee80211_local *local = sdata->local;
4195 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4196 const struct ieee80211_ht_cap *ht_cap = NULL;
4197 const struct ieee80211_ht_operation *ht_oper = NULL;
4198 const struct ieee80211_vht_operation *vht_oper = NULL;
4199 struct ieee80211_supported_band *sband;
4200 struct cfg80211_chan_def chandef;
4201 int ret;
4202 u32 i;
4203 bool have_80mhz;
4204
4205 sband = local->hw.wiphy->bands[cbss->channel->band];
4206
4207 ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
4208 IEEE80211_STA_DISABLE_80P80MHZ |
4209 IEEE80211_STA_DISABLE_160MHZ);
4210
4211 rcu_read_lock();
4212
4213 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
4214 sband->ht_cap.ht_supported) {
4215 const u8 *ht_oper_ie, *ht_cap_ie;
4216
4217 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4218 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
4219 ht_oper = (void *)(ht_oper_ie + 2);
4220
4221 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4222 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
4223 ht_cap = (void *)(ht_cap_ie + 2);
4224
4225 if (!ht_cap) {
4226 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4227 ht_oper = NULL;
4228 }
4229 }
4230
4231 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4232 sband->vht_cap.vht_supported) {
4233 const u8 *vht_oper_ie, *vht_cap;
4234
4235 vht_oper_ie = ieee80211_bss_get_ie(cbss,
4236 WLAN_EID_VHT_OPERATION);
4237 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
4238 vht_oper = (void *)(vht_oper_ie + 2);
4239 if (vht_oper && !ht_oper) {
4240 vht_oper = NULL;
4241 sdata_info(sdata,
4242 "AP advertised VHT without HT, disabling both\n");
4243 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4244 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4245 }
4246
4247 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4248 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
4249 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4250 vht_oper = NULL;
4251 }
4252 }
4253
4254 /* Allow VHT if at least one channel on the sband supports 80 MHz */
4255 have_80mhz = false;
4256 for (i = 0; i < sband->n_channels; i++) {
4257 if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
4258 IEEE80211_CHAN_NO_80MHZ))
4259 continue;
4260
4261 have_80mhz = true;
4262 break;
4263 }
4264
4265 if (!have_80mhz)
4266 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4267
4268 ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
4269 cbss->channel,
4270 ht_cap, ht_oper, vht_oper,
4271 &chandef, false);
4272
4273 sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
4274 local->rx_chains);
4275
4276 rcu_read_unlock();
4277
4278 /* will change later if needed */
4279 sdata->smps_mode = IEEE80211_SMPS_OFF;
4280
4281 mutex_lock(&local->mtx);
4282 /*
4283 * If this fails (possibly due to channel context sharing
4284 * on incompatible channels, e.g. 80+80 and 160 sharing the
4285 * same control channel) try to use a smaller bandwidth.
4286 */
4287 ret = ieee80211_vif_use_channel(sdata, &chandef,
4288 IEEE80211_CHANCTX_SHARED);
4289
4290 /* don't downgrade for 5 and 10 MHz channels, though. */
4291 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
4292 chandef.width == NL80211_CHAN_WIDTH_10)
4293 goto out;
4294
4295 while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4296 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4297 ret = ieee80211_vif_use_channel(sdata, &chandef,
4298 IEEE80211_CHANCTX_SHARED);
4299 }
4300 out:
4301 mutex_unlock(&local->mtx);
4302 return ret;
4303 }
4304
4305 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4306 struct cfg80211_bss *cbss, bool assoc,
4307 bool override)
4308 {
4309 struct ieee80211_local *local = sdata->local;
4310 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4311 struct ieee80211_bss *bss = (void *)cbss->priv;
4312 struct sta_info *new_sta = NULL;
4313 struct ieee80211_supported_band *sband;
4314 bool have_sta = false;
4315 int err;
4316
4317 sband = local->hw.wiphy->bands[cbss->channel->band];
4318
4319 if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
4320 return -EINVAL;
4321
4322 if (assoc) {
4323 rcu_read_lock();
4324 have_sta = sta_info_get(sdata, cbss->bssid);
4325 rcu_read_unlock();
4326 }
4327
4328 if (!have_sta) {
4329 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
4330 if (!new_sta)
4331 return -ENOMEM;
4332 }
4333
4334 if (new_sta || override) {
4335 err = ieee80211_prep_channel(sdata, cbss);
4336 if (err) {
4337 if (new_sta)
4338 sta_info_free(local, new_sta);
4339 return -EINVAL;
4340 }
4341 }
4342
4343 if (new_sta) {
4344 u32 rates = 0, basic_rates = 0;
4345 bool have_higher_than_11mbit;
4346 int min_rate = INT_MAX, min_rate_index = -1;
4347 struct ieee80211_chanctx_conf *chanctx_conf;
4348 const struct cfg80211_bss_ies *ies;
4349 int shift = ieee80211_vif_get_shift(&sdata->vif);
4350 u32 rate_flags;
4351
4352 rcu_read_lock();
4353 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4354 if (WARN_ON(!chanctx_conf)) {
4355 rcu_read_unlock();
4356 sta_info_free(local, new_sta);
4357 return -EINVAL;
4358 }
4359 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
4360 rcu_read_unlock();
4361
4362 ieee80211_get_rates(sband, bss->supp_rates,
4363 bss->supp_rates_len,
4364 &rates, &basic_rates,
4365 &have_higher_than_11mbit,
4366 &min_rate, &min_rate_index,
4367 shift, rate_flags);
4368
4369 /*
4370 * This used to be a workaround for basic rates missing
4371 * in the association response frame. Now that we no
4372 * longer use the basic rates from there, it probably
4373 * doesn't happen any more, but keep the workaround so
4374 * in case some *other* APs are buggy in different ways
4375 * we can connect -- with a warning.
4376 */
4377 if (!basic_rates && min_rate_index >= 0) {
4378 sdata_info(sdata,
4379 "No basic rates, using min rate instead\n");
4380 basic_rates = BIT(min_rate_index);
4381 }
4382
4383 new_sta->sta.supp_rates[cbss->channel->band] = rates;
4384 sdata->vif.bss_conf.basic_rates = basic_rates;
4385
4386 /* cf. IEEE 802.11 9.2.12 */
4387 if (cbss->channel->band == NL80211_BAND_2GHZ &&
4388 have_higher_than_11mbit)
4389 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
4390 else
4391 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
4392
4393 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
4394
4395 /* set timing information */
4396 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
4397 rcu_read_lock();
4398 ies = rcu_dereference(cbss->beacon_ies);
4399 if (ies) {
4400 const u8 *tim_ie;
4401
4402 sdata->vif.bss_conf.sync_tsf = ies->tsf;
4403 sdata->vif.bss_conf.sync_device_ts =
4404 bss->device_ts_beacon;
4405 tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4406 ies->data, ies->len);
4407 if (tim_ie && tim_ie[1] >= 2)
4408 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
4409 else
4410 sdata->vif.bss_conf.sync_dtim_count = 0;
4411 } else if (!ieee80211_hw_check(&sdata->local->hw,
4412 TIMING_BEACON_ONLY)) {
4413 ies = rcu_dereference(cbss->proberesp_ies);
4414 /* must be non-NULL since beacon IEs were NULL */
4415 sdata->vif.bss_conf.sync_tsf = ies->tsf;
4416 sdata->vif.bss_conf.sync_device_ts =
4417 bss->device_ts_presp;
4418 sdata->vif.bss_conf.sync_dtim_count = 0;
4419 } else {
4420 sdata->vif.bss_conf.sync_tsf = 0;
4421 sdata->vif.bss_conf.sync_device_ts = 0;
4422 sdata->vif.bss_conf.sync_dtim_count = 0;
4423 }
4424 rcu_read_unlock();
4425
4426 /* tell driver about BSSID, basic rates and timing */
4427 ieee80211_bss_info_change_notify(sdata,
4428 BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4429 BSS_CHANGED_BEACON_INT);
4430
4431 if (assoc)
4432 sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4433
4434 err = sta_info_insert(new_sta);
4435 new_sta = NULL;
4436 if (err) {
4437 sdata_info(sdata,
4438 "failed to insert STA entry for the AP (error %d)\n",
4439 err);
4440 return err;
4441 }
4442 } else
4443 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4444
4445 /* Cancel scan to ensure that nothing interferes with connection */
4446 if (local->scanning)
4447 ieee80211_scan_cancel(local);
4448
4449 return 0;
4450 }
4451
4452 /* config hooks */
4453 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4454 struct cfg80211_auth_request *req)
4455 {
4456 struct ieee80211_local *local = sdata->local;
4457 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4458 struct ieee80211_mgd_auth_data *auth_data;
4459 u16 auth_alg;
4460 int err;
4461
4462 /* prepare auth data structure */
4463
4464 switch (req->auth_type) {
4465 case NL80211_AUTHTYPE_OPEN_SYSTEM:
4466 auth_alg = WLAN_AUTH_OPEN;
4467 break;
4468 case NL80211_AUTHTYPE_SHARED_KEY:
4469 if (IS_ERR(local->wep_tx_tfm))
4470 return -EOPNOTSUPP;
4471 auth_alg = WLAN_AUTH_SHARED_KEY;
4472 break;
4473 case NL80211_AUTHTYPE_FT:
4474 auth_alg = WLAN_AUTH_FT;
4475 break;
4476 case NL80211_AUTHTYPE_NETWORK_EAP:
4477 auth_alg = WLAN_AUTH_LEAP;
4478 break;
4479 case NL80211_AUTHTYPE_SAE:
4480 auth_alg = WLAN_AUTH_SAE;
4481 break;
4482 default:
4483 return -EOPNOTSUPP;
4484 }
4485
4486 auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
4487 req->ie_len, GFP_KERNEL);
4488 if (!auth_data)
4489 return -ENOMEM;
4490
4491 auth_data->bss = req->bss;
4492
4493 if (req->sae_data_len >= 4) {
4494 __le16 *pos = (__le16 *) req->sae_data;
4495 auth_data->sae_trans = le16_to_cpu(pos[0]);
4496 auth_data->sae_status = le16_to_cpu(pos[1]);
4497 memcpy(auth_data->data, req->sae_data + 4,
4498 req->sae_data_len - 4);
4499 auth_data->data_len += req->sae_data_len - 4;
4500 }
4501
4502 if (req->ie && req->ie_len) {
4503 memcpy(&auth_data->data[auth_data->data_len],
4504 req->ie, req->ie_len);
4505 auth_data->data_len += req->ie_len;
4506 }
4507
4508 if (req->key && req->key_len) {
4509 auth_data->key_len = req->key_len;
4510 auth_data->key_idx = req->key_idx;
4511 memcpy(auth_data->key, req->key, req->key_len);
4512 }
4513
4514 auth_data->algorithm = auth_alg;
4515
4516 /* try to authenticate/probe */
4517
4518 if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4519 ifmgd->assoc_data) {
4520 err = -EBUSY;
4521 goto err_free;
4522 }
4523
4524 if (ifmgd->auth_data)
4525 ieee80211_destroy_auth_data(sdata, false);
4526
4527 /* prep auth_data so we don't go into idle on disassoc */
4528 ifmgd->auth_data = auth_data;
4529
4530 if (ifmgd->associated) {
4531 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4532
4533 sdata_info(sdata,
4534 "disconnect from AP %pM for new auth to %pM\n",
4535 ifmgd->associated->bssid, req->bss->bssid);
4536 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4537 WLAN_REASON_UNSPECIFIED,
4538 false, frame_buf);
4539
4540 ieee80211_report_disconnect(sdata, frame_buf,
4541 sizeof(frame_buf), true,
4542 WLAN_REASON_UNSPECIFIED);
4543 }
4544
4545 sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4546
4547 err = ieee80211_prep_connection(sdata, req->bss, false, false);
4548 if (err)
4549 goto err_clear;
4550
4551 err = ieee80211_auth(sdata);
4552 if (err) {
4553 sta_info_destroy_addr(sdata, req->bss->bssid);
4554 goto err_clear;
4555 }
4556
4557 /* hold our own reference */
4558 cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4559 return 0;
4560
4561 err_clear:
4562 eth_zero_addr(ifmgd->bssid);
4563 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4564 ifmgd->auth_data = NULL;
4565 mutex_lock(&sdata->local->mtx);
4566 ieee80211_vif_release_channel(sdata);
4567 mutex_unlock(&sdata->local->mtx);
4568 err_free:
4569 kfree(auth_data);
4570 return err;
4571 }
4572
4573 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4574 struct cfg80211_assoc_request *req)
4575 {
4576 struct ieee80211_local *local = sdata->local;
4577 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4578 struct ieee80211_bss *bss = (void *)req->bss->priv;
4579 struct ieee80211_mgd_assoc_data *assoc_data;
4580 const struct cfg80211_bss_ies *beacon_ies;
4581 struct ieee80211_supported_band *sband;
4582 const u8 *ssidie, *ht_ie, *vht_ie;
4583 int i, err;
4584 bool override = false;
4585
4586 assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4587 if (!assoc_data)
4588 return -ENOMEM;
4589
4590 rcu_read_lock();
4591 ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4592 if (!ssidie) {
4593 rcu_read_unlock();
4594 kfree(assoc_data);
4595 return -EINVAL;
4596 }
4597 memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4598 assoc_data->ssid_len = ssidie[1];
4599 rcu_read_unlock();
4600
4601 if (ifmgd->associated) {
4602 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4603
4604 sdata_info(sdata,
4605 "disconnect from AP %pM for new assoc to %pM\n",
4606 ifmgd->associated->bssid, req->bss->bssid);
4607 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4608 WLAN_REASON_UNSPECIFIED,
4609 false, frame_buf);
4610
4611 ieee80211_report_disconnect(sdata, frame_buf,
4612 sizeof(frame_buf), true,
4613 WLAN_REASON_UNSPECIFIED);
4614 }
4615
4616 if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4617 err = -EBUSY;
4618 goto err_free;
4619 }
4620
4621 if (ifmgd->assoc_data) {
4622 err = -EBUSY;
4623 goto err_free;
4624 }
4625
4626 if (ifmgd->auth_data) {
4627 bool match;
4628
4629 /* keep sta info, bssid if matching */
4630 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4631 ieee80211_destroy_auth_data(sdata, match);
4632 }
4633
4634 /* prepare assoc data */
4635
4636 ifmgd->beacon_crc_valid = false;
4637
4638 assoc_data->wmm = bss->wmm_used &&
4639 (local->hw.queues >= IEEE80211_NUM_ACS);
4640
4641 /*
4642 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4643 * We still associate in non-HT mode (11a/b/g) if any one of these
4644 * ciphers is configured as pairwise.
4645 * We can set this to true for non-11n hardware, that'll be checked
4646 * separately along with the peer capabilities.
4647 */
4648 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4649 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4650 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4651 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4652 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4653 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4654 netdev_info(sdata->dev,
4655 "disabling HT/VHT due to WEP/TKIP use\n");
4656 }
4657 }
4658
4659 /* Also disable HT if we don't support it or the AP doesn't use WMM */
4660 sband = local->hw.wiphy->bands[req->bss->channel->band];
4661 if (!sband->ht_cap.ht_supported ||
4662 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4663 ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4664 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4665 if (!bss->wmm_used &&
4666 !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4667 netdev_info(sdata->dev,
4668 "disabling HT as WMM/QoS is not supported by the AP\n");
4669 }
4670
4671 /* disable VHT if we don't support it or the AP doesn't use WMM */
4672 if (!sband->vht_cap.vht_supported ||
4673 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4674 ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4675 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4676 if (!bss->wmm_used &&
4677 !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4678 netdev_info(sdata->dev,
4679 "disabling VHT as WMM/QoS is not supported by the AP\n");
4680 }
4681
4682 memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4683 memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4684 sizeof(ifmgd->ht_capa_mask));
4685
4686 memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4687 memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4688 sizeof(ifmgd->vht_capa_mask));
4689
4690 if (req->ie && req->ie_len) {
4691 memcpy(assoc_data->ie, req->ie, req->ie_len);
4692 assoc_data->ie_len = req->ie_len;
4693 }
4694
4695 assoc_data->bss = req->bss;
4696
4697 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4698 if (ifmgd->powersave)
4699 sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4700 else
4701 sdata->smps_mode = IEEE80211_SMPS_OFF;
4702 } else
4703 sdata->smps_mode = ifmgd->req_smps;
4704
4705 assoc_data->capability = req->bss->capability;
4706 assoc_data->supp_rates = bss->supp_rates;
4707 assoc_data->supp_rates_len = bss->supp_rates_len;
4708
4709 rcu_read_lock();
4710 ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4711 if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4712 assoc_data->ap_ht_param =
4713 ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4714 else
4715 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4716 vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4717 if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4718 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4719 sizeof(struct ieee80211_vht_cap));
4720 else
4721 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4722 rcu_read_unlock();
4723
4724 if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) &&
4725 ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK),
4726 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"))
4727 sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;
4728
4729 if (bss->wmm_used && bss->uapsd_supported &&
4730 (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) {
4731 assoc_data->uapsd = true;
4732 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4733 } else {
4734 assoc_data->uapsd = false;
4735 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4736 }
4737
4738 if (req->prev_bssid)
4739 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4740
4741 if (req->use_mfp) {
4742 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4743 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4744 } else {
4745 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4746 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4747 }
4748
4749 if (req->flags & ASSOC_REQ_USE_RRM)
4750 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
4751 else
4752 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;
4753
4754 if (req->crypto.control_port)
4755 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4756 else
4757 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4758
4759 sdata->control_port_protocol = req->crypto.control_port_ethertype;
4760 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4761 sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4762 sdata->vif.type);
4763
4764 /* kick off associate process */
4765
4766 ifmgd->assoc_data = assoc_data;
4767 ifmgd->dtim_period = 0;
4768 ifmgd->have_beacon = false;
4769
4770 /* override HT/VHT configuration only if the AP and we support it */
4771 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
4772 struct ieee80211_sta_ht_cap sta_ht_cap;
4773
4774 if (req->flags & ASSOC_REQ_DISABLE_HT)
4775 override = true;
4776
4777 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
4778 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
4779
4780 /* check for 40 MHz disable override */
4781 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ) &&
4782 sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
4783 !(sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
4784 override = true;
4785
4786 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4787 req->flags & ASSOC_REQ_DISABLE_VHT)
4788 override = true;
4789 }
4790
4791 if (req->flags & ASSOC_REQ_DISABLE_HT) {
4792 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4793 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4794 }
4795
4796 if (req->flags & ASSOC_REQ_DISABLE_VHT)
4797 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4798
4799 err = ieee80211_prep_connection(sdata, req->bss, true, override);
4800 if (err)
4801 goto err_clear;
4802
4803 rcu_read_lock();
4804 beacon_ies = rcu_dereference(req->bss->beacon_ies);
4805
4806 if (ieee80211_hw_check(&sdata->local->hw, NEED_DTIM_BEFORE_ASSOC) &&
4807 !beacon_ies) {
4808 /*
4809 * Wait up to one beacon interval ...
4810 * should this be more if we miss one?
4811 */
4812 sdata_info(sdata, "waiting for beacon from %pM\n",
4813 ifmgd->bssid);
4814 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4815 assoc_data->timeout_started = true;
4816 assoc_data->need_beacon = true;
4817 } else if (beacon_ies) {
4818 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4819 beacon_ies->data,
4820 beacon_ies->len);
4821 u8 dtim_count = 0;
4822
4823 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4824 const struct ieee80211_tim_ie *tim;
4825 tim = (void *)(tim_ie + 2);
4826 ifmgd->dtim_period = tim->dtim_period;
4827 dtim_count = tim->dtim_count;
4828 }
4829 ifmgd->have_beacon = true;
4830 assoc_data->timeout = jiffies;
4831 assoc_data->timeout_started = true;
4832
4833 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
4834 sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4835 sdata->vif.bss_conf.sync_device_ts =
4836 bss->device_ts_beacon;
4837 sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4838 }
4839 } else {
4840 assoc_data->timeout = jiffies;
4841 assoc_data->timeout_started = true;
4842 }
4843 rcu_read_unlock();
4844
4845 run_again(sdata, assoc_data->timeout);
4846
4847 if (bss->corrupt_data) {
4848 char *corrupt_type = "data";
4849 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4850 if (bss->corrupt_data &
4851 IEEE80211_BSS_CORRUPT_PROBE_RESP)
4852 corrupt_type = "beacon and probe response";
4853 else
4854 corrupt_type = "beacon";
4855 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4856 corrupt_type = "probe response";
4857 sdata_info(sdata, "associating with AP with corrupt %s\n",
4858 corrupt_type);
4859 }
4860
4861 return 0;
4862 err_clear:
4863 eth_zero_addr(ifmgd->bssid);
4864 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4865 ifmgd->assoc_data = NULL;
4866 err_free:
4867 kfree(assoc_data);
4868 return err;
4869 }
4870
4871 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4872 struct cfg80211_deauth_request *req)
4873 {
4874 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4875 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4876 bool tx = !req->local_state_change;
4877
4878 if (ifmgd->auth_data &&
4879 ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
4880 sdata_info(sdata,
4881 "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
4882 req->bssid, req->reason_code,
4883 ieee80211_get_reason_code_string(req->reason_code));
4884
4885 drv_mgd_prepare_tx(sdata->local, sdata);
4886 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4887 IEEE80211_STYPE_DEAUTH,
4888 req->reason_code, tx,
4889 frame_buf);
4890 ieee80211_destroy_auth_data(sdata, false);
4891 ieee80211_report_disconnect(sdata, frame_buf,
4892 sizeof(frame_buf), true,
4893 req->reason_code);
4894
4895 return 0;
4896 }
4897
4898 if (ifmgd->assoc_data &&
4899 ether_addr_equal(ifmgd->assoc_data->bss->bssid, req->bssid)) {
4900 sdata_info(sdata,
4901 "aborting association with %pM by local choice (Reason: %u=%s)\n",
4902 req->bssid, req->reason_code,
4903 ieee80211_get_reason_code_string(req->reason_code));
4904
4905 drv_mgd_prepare_tx(sdata->local, sdata);
4906 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4907 IEEE80211_STYPE_DEAUTH,
4908 req->reason_code, tx,
4909 frame_buf);
4910 ieee80211_destroy_assoc_data(sdata, false);
4911 ieee80211_report_disconnect(sdata, frame_buf,
4912 sizeof(frame_buf), true,
4913 req->reason_code);
4914 return 0;
4915 }
4916
4917 if (ifmgd->associated &&
4918 ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4919 sdata_info(sdata,
4920 "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
4921 req->bssid, req->reason_code,
4922 ieee80211_get_reason_code_string(req->reason_code));
4923
4924 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4925 req->reason_code, tx, frame_buf);
4926 ieee80211_report_disconnect(sdata, frame_buf,
4927 sizeof(frame_buf), true,
4928 req->reason_code);
4929 return 0;
4930 }
4931
4932 return -ENOTCONN;
4933 }
4934
4935 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4936 struct cfg80211_disassoc_request *req)
4937 {
4938 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4939 u8 bssid[ETH_ALEN];
4940 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4941
4942 /*
4943 * cfg80211 should catch this ... but it's racy since
4944 * we can receive a disassoc frame, process it, hand it
4945 * to cfg80211 while that's in a locked section already
4946 * trying to tell us that the user wants to disconnect.
4947 */
4948 if (ifmgd->associated != req->bss)
4949 return -ENOLINK;
4950
4951 sdata_info(sdata,
4952 "disassociating from %pM by local choice (Reason: %u=%s)\n",
4953 req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
4954
4955 memcpy(bssid, req->bss->bssid, ETH_ALEN);
4956 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
4957 req->reason_code, !req->local_state_change,
4958 frame_buf);
4959
4960 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
4961 req->reason_code);
4962
4963 return 0;
4964 }
4965
4966 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4967 {
4968 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4969
4970 /*
4971 * Make sure some work items will not run after this,
4972 * they will not do anything but might not have been
4973 * cancelled when disconnecting.
4974 */
4975 cancel_work_sync(&ifmgd->monitor_work);
4976 cancel_work_sync(&ifmgd->beacon_connection_loss_work);
4977 cancel_work_sync(&ifmgd->request_smps_work);
4978 cancel_work_sync(&ifmgd->csa_connection_drop_work);
4979 cancel_work_sync(&ifmgd->chswitch_work);
4980 cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
4981
4982 sdata_lock(sdata);
4983 if (ifmgd->assoc_data) {
4984 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
4985 ieee80211_destroy_assoc_data(sdata, false);
4986 cfg80211_assoc_timeout(sdata->dev, bss);
4987 }
4988 if (ifmgd->auth_data)
4989 ieee80211_destroy_auth_data(sdata, false);
4990 spin_lock_bh(&ifmgd->teardown_lock);
4991 if (ifmgd->teardown_skb) {
4992 kfree_skb(ifmgd->teardown_skb);
4993 ifmgd->teardown_skb = NULL;
4994 ifmgd->orig_teardown_skb = NULL;
4995 }
4996 spin_unlock_bh(&ifmgd->teardown_lock);
4997 del_timer_sync(&ifmgd->timer);
4998 sdata_unlock(sdata);
4999 }
5000
5001 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
5002 enum nl80211_cqm_rssi_threshold_event rssi_event,
5003 gfp_t gfp)
5004 {
5005 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5006
5007 trace_api_cqm_rssi_notify(sdata, rssi_event);
5008
5009 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
5010 }
5011 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
5012
5013 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp)
5014 {
5015 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5016
5017 trace_api_cqm_beacon_loss_notify(sdata->local, sdata);
5018
5019 cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp);
5020 }
5021 EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify);
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