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Merge tag 'md/4.8-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md
[deliverable/linux.git] / net / mac80211 / mlme.c
1 /*
2 * BSS client mode implementation
3 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4 * Copyright 2004, Instant802 Networks, Inc.
5 * Copyright 2005, Devicescape Software, Inc.
6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8 * Copyright 2013-2014 Intel Mobile Communications GmbH
9 * Copyright (C) 2015 - 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 /* The loop will result in using BK even if it requires
1676 * admission control, such configuration makes no sense
1677 * and we have to transmit somehow - the AC selection
1678 * does the same thing.
1679 */
1680 if (drv_conf_tx(local, sdata, ac,
1681 &sdata->tx_conf[non_acm_ac]))
1682 sdata_err(sdata,
1683 "failed to set TX queue parameters for queue %d\n",
1684 ac);
1685 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1686 ret = true;
1687 schedule_delayed_work(&ifmgd->tx_tspec_wk,
1688 tx_tspec->time_slice_start + HZ - now + 1);
1689 break;
1690 case TX_TSPEC_ACTION_NONE:
1691 /* nothing now */
1692 break;
1693 }
1694 }
1695
1696 return ret;
1697 }
1698
1699 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1700 {
1701 if (__ieee80211_sta_handle_tspec_ac_params(sdata))
1702 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
1703 }
1704
1705 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work)
1706 {
1707 struct ieee80211_sub_if_data *sdata;
1708
1709 sdata = container_of(work, struct ieee80211_sub_if_data,
1710 u.mgd.tx_tspec_wk.work);
1711 ieee80211_sta_handle_tspec_ac_params(sdata);
1712 }
1713
1714 /* MLME */
1715 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1716 struct ieee80211_sub_if_data *sdata,
1717 const u8 *wmm_param, size_t wmm_param_len)
1718 {
1719 struct ieee80211_tx_queue_params params[IEEE80211_NUM_ACS];
1720 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1721 size_t left;
1722 int count, ac;
1723 const u8 *pos;
1724 u8 uapsd_queues = 0;
1725
1726 if (!local->ops->conf_tx)
1727 return false;
1728
1729 if (local->hw.queues < IEEE80211_NUM_ACS)
1730 return false;
1731
1732 if (!wmm_param)
1733 return false;
1734
1735 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1736 return false;
1737
1738 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1739 uapsd_queues = ifmgd->uapsd_queues;
1740
1741 count = wmm_param[6] & 0x0f;
1742 if (count == ifmgd->wmm_last_param_set)
1743 return false;
1744 ifmgd->wmm_last_param_set = count;
1745
1746 pos = wmm_param + 8;
1747 left = wmm_param_len - 8;
1748
1749 memset(&params, 0, sizeof(params));
1750
1751 sdata->wmm_acm = 0;
1752 for (; left >= 4; left -= 4, pos += 4) {
1753 int aci = (pos[0] >> 5) & 0x03;
1754 int acm = (pos[0] >> 4) & 0x01;
1755 bool uapsd = false;
1756
1757 switch (aci) {
1758 case 1: /* AC_BK */
1759 ac = IEEE80211_AC_BK;
1760 if (acm)
1761 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1762 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1763 uapsd = true;
1764 break;
1765 case 2: /* AC_VI */
1766 ac = IEEE80211_AC_VI;
1767 if (acm)
1768 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1769 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1770 uapsd = true;
1771 break;
1772 case 3: /* AC_VO */
1773 ac = IEEE80211_AC_VO;
1774 if (acm)
1775 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1776 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1777 uapsd = true;
1778 break;
1779 case 0: /* AC_BE */
1780 default:
1781 ac = IEEE80211_AC_BE;
1782 if (acm)
1783 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1784 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1785 uapsd = true;
1786 break;
1787 }
1788
1789 params[ac].aifs = pos[0] & 0x0f;
1790
1791 if (params[ac].aifs < 2) {
1792 sdata_info(sdata,
1793 "AP has invalid WMM params (AIFSN=%d for ACI %d), will use 2\n",
1794 params[ac].aifs, aci);
1795 params[ac].aifs = 2;
1796 }
1797 params[ac].cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1798 params[ac].cw_min = ecw2cw(pos[1] & 0x0f);
1799 params[ac].txop = get_unaligned_le16(pos + 2);
1800 params[ac].acm = acm;
1801 params[ac].uapsd = uapsd;
1802
1803 if (params[ac].cw_min > params[ac].cw_max) {
1804 sdata_info(sdata,
1805 "AP has invalid WMM params (CWmin/max=%d/%d for ACI %d), using defaults\n",
1806 params[ac].cw_min, params[ac].cw_max, aci);
1807 return false;
1808 }
1809 }
1810
1811 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1812 mlme_dbg(sdata,
1813 "WMM AC=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n",
1814 ac, params[ac].acm,
1815 params[ac].aifs, params[ac].cw_min, params[ac].cw_max,
1816 params[ac].txop, params[ac].uapsd,
1817 ifmgd->tx_tspec[ac].downgraded);
1818 sdata->tx_conf[ac] = params[ac];
1819 if (!ifmgd->tx_tspec[ac].downgraded &&
1820 drv_conf_tx(local, sdata, ac, &params[ac]))
1821 sdata_err(sdata,
1822 "failed to set TX queue parameters for AC %d\n",
1823 ac);
1824 }
1825
1826 /* enable WMM or activate new settings */
1827 sdata->vif.bss_conf.qos = true;
1828 return true;
1829 }
1830
1831 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1832 {
1833 lockdep_assert_held(&sdata->local->mtx);
1834
1835 sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1836 ieee80211_run_deferred_scan(sdata->local);
1837 }
1838
1839 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1840 {
1841 mutex_lock(&sdata->local->mtx);
1842 __ieee80211_stop_poll(sdata);
1843 mutex_unlock(&sdata->local->mtx);
1844 }
1845
1846 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1847 u16 capab, bool erp_valid, u8 erp)
1848 {
1849 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1850 u32 changed = 0;
1851 bool use_protection;
1852 bool use_short_preamble;
1853 bool use_short_slot;
1854
1855 if (erp_valid) {
1856 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1857 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1858 } else {
1859 use_protection = false;
1860 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1861 }
1862
1863 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1864 if (ieee80211_get_sdata_band(sdata) == NL80211_BAND_5GHZ)
1865 use_short_slot = true;
1866
1867 if (use_protection != bss_conf->use_cts_prot) {
1868 bss_conf->use_cts_prot = use_protection;
1869 changed |= BSS_CHANGED_ERP_CTS_PROT;
1870 }
1871
1872 if (use_short_preamble != bss_conf->use_short_preamble) {
1873 bss_conf->use_short_preamble = use_short_preamble;
1874 changed |= BSS_CHANGED_ERP_PREAMBLE;
1875 }
1876
1877 if (use_short_slot != bss_conf->use_short_slot) {
1878 bss_conf->use_short_slot = use_short_slot;
1879 changed |= BSS_CHANGED_ERP_SLOT;
1880 }
1881
1882 return changed;
1883 }
1884
1885 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1886 struct cfg80211_bss *cbss,
1887 u32 bss_info_changed)
1888 {
1889 struct ieee80211_bss *bss = (void *)cbss->priv;
1890 struct ieee80211_local *local = sdata->local;
1891 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1892
1893 bss_info_changed |= BSS_CHANGED_ASSOC;
1894 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1895 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1896
1897 sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1898 beacon_loss_count * bss_conf->beacon_int));
1899
1900 sdata->u.mgd.associated = cbss;
1901 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1902
1903 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1904
1905 if (sdata->vif.p2p ||
1906 sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) {
1907 const struct cfg80211_bss_ies *ies;
1908
1909 rcu_read_lock();
1910 ies = rcu_dereference(cbss->ies);
1911 if (ies) {
1912 int ret;
1913
1914 ret = cfg80211_get_p2p_attr(
1915 ies->data, ies->len,
1916 IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1917 (u8 *) &bss_conf->p2p_noa_attr,
1918 sizeof(bss_conf->p2p_noa_attr));
1919 if (ret >= 2) {
1920 sdata->u.mgd.p2p_noa_index =
1921 bss_conf->p2p_noa_attr.index;
1922 bss_info_changed |= BSS_CHANGED_P2P_PS;
1923 }
1924 }
1925 rcu_read_unlock();
1926 }
1927
1928 /* just to be sure */
1929 ieee80211_stop_poll(sdata);
1930
1931 ieee80211_led_assoc(local, 1);
1932
1933 if (sdata->u.mgd.have_beacon) {
1934 /*
1935 * If the AP is buggy we may get here with no DTIM period
1936 * known, so assume it's 1 which is the only safe assumption
1937 * in that case, although if the TIM IE is broken powersave
1938 * probably just won't work at all.
1939 */
1940 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1941 bss_conf->beacon_rate = bss->beacon_rate;
1942 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1943 } else {
1944 bss_conf->beacon_rate = NULL;
1945 bss_conf->dtim_period = 0;
1946 }
1947
1948 bss_conf->assoc = 1;
1949
1950 /* Tell the driver to monitor connection quality (if supported) */
1951 if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1952 bss_conf->cqm_rssi_thold)
1953 bss_info_changed |= BSS_CHANGED_CQM;
1954
1955 /* Enable ARP filtering */
1956 if (bss_conf->arp_addr_cnt)
1957 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1958
1959 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1960
1961 mutex_lock(&local->iflist_mtx);
1962 ieee80211_recalc_ps(local);
1963 mutex_unlock(&local->iflist_mtx);
1964
1965 ieee80211_recalc_smps(sdata);
1966 ieee80211_recalc_ps_vif(sdata);
1967
1968 netif_carrier_on(sdata->dev);
1969 }
1970
1971 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1972 u16 stype, u16 reason, bool tx,
1973 u8 *frame_buf)
1974 {
1975 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1976 struct ieee80211_local *local = sdata->local;
1977 u32 changed = 0;
1978
1979 sdata_assert_lock(sdata);
1980
1981 if (WARN_ON_ONCE(tx && !frame_buf))
1982 return;
1983
1984 if (WARN_ON(!ifmgd->associated))
1985 return;
1986
1987 ieee80211_stop_poll(sdata);
1988
1989 ifmgd->associated = NULL;
1990 netif_carrier_off(sdata->dev);
1991
1992 /*
1993 * if we want to get out of ps before disassoc (why?) we have
1994 * to do it before sending disassoc, as otherwise the null-packet
1995 * won't be valid.
1996 */
1997 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1998 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1999 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2000 }
2001 local->ps_sdata = NULL;
2002
2003 /* disable per-vif ps */
2004 ieee80211_recalc_ps_vif(sdata);
2005
2006 /* make sure ongoing transmission finishes */
2007 synchronize_net();
2008
2009 /*
2010 * drop any frame before deauth/disassoc, this can be data or
2011 * management frame. Since we are disconnecting, we should not
2012 * insist sending these frames which can take time and delay
2013 * the disconnection and possible the roaming.
2014 */
2015 if (tx)
2016 ieee80211_flush_queues(local, sdata, true);
2017
2018 /* deauthenticate/disassociate now */
2019 if (tx || frame_buf)
2020 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
2021 reason, tx, frame_buf);
2022
2023 /* flush out frame - make sure the deauth was actually sent */
2024 if (tx)
2025 ieee80211_flush_queues(local, sdata, false);
2026
2027 /* clear bssid only after building the needed mgmt frames */
2028 eth_zero_addr(ifmgd->bssid);
2029
2030 /* remove AP and TDLS peers */
2031 sta_info_flush(sdata);
2032
2033 /* finally reset all BSS / config parameters */
2034 changed |= ieee80211_reset_erp_info(sdata);
2035
2036 ieee80211_led_assoc(local, 0);
2037 changed |= BSS_CHANGED_ASSOC;
2038 sdata->vif.bss_conf.assoc = false;
2039
2040 ifmgd->p2p_noa_index = -1;
2041 memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
2042 sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2043
2044 /* on the next assoc, re-program HT/VHT parameters */
2045 memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
2046 memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2047 memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
2048 memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2049
2050 /* reset MU-MIMO ownership and group data */
2051 memset(sdata->vif.bss_conf.mu_group.membership, 0,
2052 sizeof(sdata->vif.bss_conf.mu_group.membership));
2053 memset(sdata->vif.bss_conf.mu_group.position, 0,
2054 sizeof(sdata->vif.bss_conf.mu_group.position));
2055 changed |= BSS_CHANGED_MU_GROUPS;
2056 sdata->vif.mu_mimo_owner = false;
2057
2058 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2059
2060 del_timer_sync(&local->dynamic_ps_timer);
2061 cancel_work_sync(&local->dynamic_ps_enable_work);
2062
2063 /* Disable ARP filtering */
2064 if (sdata->vif.bss_conf.arp_addr_cnt)
2065 changed |= BSS_CHANGED_ARP_FILTER;
2066
2067 sdata->vif.bss_conf.qos = false;
2068 changed |= BSS_CHANGED_QOS;
2069
2070 /* The BSSID (not really interesting) and HT changed */
2071 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
2072 ieee80211_bss_info_change_notify(sdata, changed);
2073
2074 /* disassociated - set to defaults now */
2075 ieee80211_set_wmm_default(sdata, false, false);
2076
2077 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
2078 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
2079 del_timer_sync(&sdata->u.mgd.timer);
2080 del_timer_sync(&sdata->u.mgd.chswitch_timer);
2081
2082 sdata->vif.bss_conf.dtim_period = 0;
2083 sdata->vif.bss_conf.beacon_rate = NULL;
2084
2085 ifmgd->have_beacon = false;
2086
2087 ifmgd->flags = 0;
2088 mutex_lock(&local->mtx);
2089 ieee80211_vif_release_channel(sdata);
2090
2091 sdata->vif.csa_active = false;
2092 ifmgd->csa_waiting_bcn = false;
2093 ifmgd->csa_ignored_same_chan = false;
2094 if (sdata->csa_block_tx) {
2095 ieee80211_wake_vif_queues(local, sdata,
2096 IEEE80211_QUEUE_STOP_REASON_CSA);
2097 sdata->csa_block_tx = false;
2098 }
2099 mutex_unlock(&local->mtx);
2100
2101 /* existing TX TSPEC sessions no longer exist */
2102 memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
2103 cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);
2104
2105 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2106 }
2107
2108 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
2109 struct ieee80211_hdr *hdr)
2110 {
2111 /*
2112 * We can postpone the mgd.timer whenever receiving unicast frames
2113 * from AP because we know that the connection is working both ways
2114 * at that time. But multicast frames (and hence also beacons) must
2115 * be ignored here, because we need to trigger the timer during
2116 * data idle periods for sending the periodic probe request to the
2117 * AP we're connected to.
2118 */
2119 if (is_multicast_ether_addr(hdr->addr1))
2120 return;
2121
2122 ieee80211_sta_reset_conn_monitor(sdata);
2123 }
2124
2125 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
2126 {
2127 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2128 struct ieee80211_local *local = sdata->local;
2129
2130 mutex_lock(&local->mtx);
2131 if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
2132 goto out;
2133
2134 __ieee80211_stop_poll(sdata);
2135
2136 mutex_lock(&local->iflist_mtx);
2137 ieee80211_recalc_ps(local);
2138 mutex_unlock(&local->iflist_mtx);
2139
2140 if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
2141 goto out;
2142
2143 /*
2144 * We've received a probe response, but are not sure whether
2145 * we have or will be receiving any beacons or data, so let's
2146 * schedule the timers again, just in case.
2147 */
2148 ieee80211_sta_reset_beacon_monitor(sdata);
2149
2150 mod_timer(&ifmgd->conn_mon_timer,
2151 round_jiffies_up(jiffies +
2152 IEEE80211_CONNECTION_IDLE_TIME));
2153 out:
2154 mutex_unlock(&local->mtx);
2155 }
2156
2157 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
2158 struct ieee80211_hdr *hdr,
2159 u16 tx_time)
2160 {
2161 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2162 u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2163 int ac = ieee80211_ac_from_tid(tid);
2164 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
2165 unsigned long now = jiffies;
2166
2167 if (likely(!tx_tspec->admitted_time))
2168 return;
2169
2170 if (time_after(now, tx_tspec->time_slice_start + HZ)) {
2171 tx_tspec->consumed_tx_time = 0;
2172 tx_tspec->time_slice_start = now;
2173
2174 if (tx_tspec->downgraded) {
2175 tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE;
2176 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2177 }
2178 }
2179
2180 if (tx_tspec->downgraded)
2181 return;
2182
2183 tx_tspec->consumed_tx_time += tx_time;
2184
2185 if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) {
2186 tx_tspec->downgraded = true;
2187 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE;
2188 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2189 }
2190 }
2191
2192 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2193 struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2194 {
2195 ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);
2196
2197 if (!ieee80211_is_data(hdr->frame_control))
2198 return;
2199
2200 if (ieee80211_is_nullfunc(hdr->frame_control) &&
2201 sdata->u.mgd.probe_send_count > 0) {
2202 if (ack)
2203 ieee80211_sta_reset_conn_monitor(sdata);
2204 else
2205 sdata->u.mgd.nullfunc_failed = true;
2206 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2207 return;
2208 }
2209
2210 if (ack)
2211 ieee80211_sta_reset_conn_monitor(sdata);
2212 }
2213
2214 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
2215 {
2216 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2217 const u8 *ssid;
2218 u8 *dst = ifmgd->associated->bssid;
2219 u8 unicast_limit = max(1, max_probe_tries - 3);
2220 struct sta_info *sta;
2221
2222 /*
2223 * Try sending broadcast probe requests for the last three
2224 * probe requests after the first ones failed since some
2225 * buggy APs only support broadcast probe requests.
2226 */
2227 if (ifmgd->probe_send_count >= unicast_limit)
2228 dst = NULL;
2229
2230 /*
2231 * When the hardware reports an accurate Tx ACK status, it's
2232 * better to send a nullfunc frame instead of a probe request,
2233 * as it will kick us off the AP quickly if we aren't associated
2234 * anymore. The timeout will be reset if the frame is ACKed by
2235 * the AP.
2236 */
2237 ifmgd->probe_send_count++;
2238
2239 if (dst) {
2240 mutex_lock(&sdata->local->sta_mtx);
2241 sta = sta_info_get(sdata, dst);
2242 if (!WARN_ON(!sta))
2243 ieee80211_check_fast_rx(sta);
2244 mutex_unlock(&sdata->local->sta_mtx);
2245 }
2246
2247 if (ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
2248 ifmgd->nullfunc_failed = false;
2249 ieee80211_send_nullfunc(sdata->local, sdata, false);
2250 } else {
2251 int ssid_len;
2252
2253 rcu_read_lock();
2254 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2255 if (WARN_ON_ONCE(ssid == NULL))
2256 ssid_len = 0;
2257 else
2258 ssid_len = ssid[1];
2259
2260 ieee80211_send_probe_req(sdata, sdata->vif.addr, dst,
2261 ssid + 2, ssid_len, NULL,
2262 0, (u32) -1, true, 0,
2263 ifmgd->associated->channel, false);
2264 rcu_read_unlock();
2265 }
2266
2267 ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2268 run_again(sdata, ifmgd->probe_timeout);
2269 }
2270
2271 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
2272 bool beacon)
2273 {
2274 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2275 bool already = false;
2276
2277 if (!ieee80211_sdata_running(sdata))
2278 return;
2279
2280 sdata_lock(sdata);
2281
2282 if (!ifmgd->associated)
2283 goto out;
2284
2285 mutex_lock(&sdata->local->mtx);
2286
2287 if (sdata->local->tmp_channel || sdata->local->scanning) {
2288 mutex_unlock(&sdata->local->mtx);
2289 goto out;
2290 }
2291
2292 if (beacon) {
2293 mlme_dbg_ratelimited(sdata,
2294 "detected beacon loss from AP (missed %d beacons) - probing\n",
2295 beacon_loss_count);
2296
2297 ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL);
2298 }
2299
2300 /*
2301 * The driver/our work has already reported this event or the
2302 * connection monitoring has kicked in and we have already sent
2303 * a probe request. Or maybe the AP died and the driver keeps
2304 * reporting until we disassociate...
2305 *
2306 * In either case we have to ignore the current call to this
2307 * function (except for setting the correct probe reason bit)
2308 * because otherwise we would reset the timer every time and
2309 * never check whether we received a probe response!
2310 */
2311 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
2312 already = true;
2313
2314 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2315
2316 mutex_unlock(&sdata->local->mtx);
2317
2318 if (already)
2319 goto out;
2320
2321 mutex_lock(&sdata->local->iflist_mtx);
2322 ieee80211_recalc_ps(sdata->local);
2323 mutex_unlock(&sdata->local->iflist_mtx);
2324
2325 ifmgd->probe_send_count = 0;
2326 ieee80211_mgd_probe_ap_send(sdata);
2327 out:
2328 sdata_unlock(sdata);
2329 }
2330
2331 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2332 struct ieee80211_vif *vif)
2333 {
2334 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2335 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2336 struct cfg80211_bss *cbss;
2337 struct sk_buff *skb;
2338 const u8 *ssid;
2339 int ssid_len;
2340
2341 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2342 return NULL;
2343
2344 sdata_assert_lock(sdata);
2345
2346 if (ifmgd->associated)
2347 cbss = ifmgd->associated;
2348 else if (ifmgd->auth_data)
2349 cbss = ifmgd->auth_data->bss;
2350 else if (ifmgd->assoc_data)
2351 cbss = ifmgd->assoc_data->bss;
2352 else
2353 return NULL;
2354
2355 rcu_read_lock();
2356 ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2357 if (WARN_ON_ONCE(ssid == NULL))
2358 ssid_len = 0;
2359 else
2360 ssid_len = ssid[1];
2361
2362 skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
2363 (u32) -1, cbss->channel,
2364 ssid + 2, ssid_len,
2365 NULL, 0, true);
2366 rcu_read_unlock();
2367
2368 return skb;
2369 }
2370 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2371
2372 static void ieee80211_report_disconnect(struct ieee80211_sub_if_data *sdata,
2373 const u8 *buf, size_t len, bool tx,
2374 u16 reason)
2375 {
2376 struct ieee80211_event event = {
2377 .type = MLME_EVENT,
2378 .u.mlme.data = tx ? DEAUTH_TX_EVENT : DEAUTH_RX_EVENT,
2379 .u.mlme.reason = reason,
2380 };
2381
2382 if (tx)
2383 cfg80211_tx_mlme_mgmt(sdata->dev, buf, len);
2384 else
2385 cfg80211_rx_mlme_mgmt(sdata->dev, buf, len);
2386
2387 drv_event_callback(sdata->local, sdata, &event);
2388 }
2389
2390 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2391 {
2392 struct ieee80211_local *local = sdata->local;
2393 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2394 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2395
2396 sdata_lock(sdata);
2397 if (!ifmgd->associated) {
2398 sdata_unlock(sdata);
2399 return;
2400 }
2401
2402 /* AP is probably out of range (or not reachable for another reason) so
2403 * remove the bss struct for that AP.
2404 */
2405 cfg80211_unlink_bss(local->hw.wiphy, ifmgd->associated);
2406
2407 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2408 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2409 true, frame_buf);
2410 mutex_lock(&local->mtx);
2411 sdata->vif.csa_active = false;
2412 ifmgd->csa_waiting_bcn = false;
2413 if (sdata->csa_block_tx) {
2414 ieee80211_wake_vif_queues(local, sdata,
2415 IEEE80211_QUEUE_STOP_REASON_CSA);
2416 sdata->csa_block_tx = false;
2417 }
2418 mutex_unlock(&local->mtx);
2419
2420 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
2421 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2422
2423 sdata_unlock(sdata);
2424 }
2425
2426 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2427 {
2428 struct ieee80211_sub_if_data *sdata =
2429 container_of(work, struct ieee80211_sub_if_data,
2430 u.mgd.beacon_connection_loss_work);
2431 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2432
2433 if (ifmgd->associated)
2434 ifmgd->beacon_loss_count++;
2435
2436 if (ifmgd->connection_loss) {
2437 sdata_info(sdata, "Connection to AP %pM lost\n",
2438 ifmgd->bssid);
2439 __ieee80211_disconnect(sdata);
2440 } else {
2441 ieee80211_mgd_probe_ap(sdata, true);
2442 }
2443 }
2444
2445 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2446 {
2447 struct ieee80211_sub_if_data *sdata =
2448 container_of(work, struct ieee80211_sub_if_data,
2449 u.mgd.csa_connection_drop_work);
2450
2451 __ieee80211_disconnect(sdata);
2452 }
2453
2454 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2455 {
2456 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2457 struct ieee80211_hw *hw = &sdata->local->hw;
2458
2459 trace_api_beacon_loss(sdata);
2460
2461 sdata->u.mgd.connection_loss = false;
2462 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2463 }
2464 EXPORT_SYMBOL(ieee80211_beacon_loss);
2465
2466 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2467 {
2468 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2469 struct ieee80211_hw *hw = &sdata->local->hw;
2470
2471 trace_api_connection_loss(sdata);
2472
2473 sdata->u.mgd.connection_loss = true;
2474 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2475 }
2476 EXPORT_SYMBOL(ieee80211_connection_loss);
2477
2478
2479 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2480 bool assoc)
2481 {
2482 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2483
2484 sdata_assert_lock(sdata);
2485
2486 if (!assoc) {
2487 /*
2488 * we are not authenticated yet, the only timer that could be
2489 * running is the timeout for the authentication response which
2490 * which is not relevant anymore.
2491 */
2492 del_timer_sync(&sdata->u.mgd.timer);
2493 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2494
2495 eth_zero_addr(sdata->u.mgd.bssid);
2496 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2497 sdata->u.mgd.flags = 0;
2498 mutex_lock(&sdata->local->mtx);
2499 ieee80211_vif_release_channel(sdata);
2500 mutex_unlock(&sdata->local->mtx);
2501 }
2502
2503 cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2504 kfree(auth_data);
2505 sdata->u.mgd.auth_data = NULL;
2506 }
2507
2508 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2509 bool assoc)
2510 {
2511 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2512
2513 sdata_assert_lock(sdata);
2514
2515 if (!assoc) {
2516 /*
2517 * we are not associated yet, the only timer that could be
2518 * running is the timeout for the association response which
2519 * which is not relevant anymore.
2520 */
2521 del_timer_sync(&sdata->u.mgd.timer);
2522 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2523
2524 eth_zero_addr(sdata->u.mgd.bssid);
2525 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2526 sdata->u.mgd.flags = 0;
2527 sdata->vif.mu_mimo_owner = false;
2528
2529 mutex_lock(&sdata->local->mtx);
2530 ieee80211_vif_release_channel(sdata);
2531 mutex_unlock(&sdata->local->mtx);
2532 }
2533
2534 kfree(assoc_data);
2535 sdata->u.mgd.assoc_data = NULL;
2536 }
2537
2538 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2539 struct ieee80211_mgmt *mgmt, size_t len)
2540 {
2541 struct ieee80211_local *local = sdata->local;
2542 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2543 u8 *pos;
2544 struct ieee802_11_elems elems;
2545 u32 tx_flags = 0;
2546
2547 pos = mgmt->u.auth.variable;
2548 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2549 if (!elems.challenge)
2550 return;
2551 auth_data->expected_transaction = 4;
2552 drv_mgd_prepare_tx(sdata->local, sdata);
2553 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
2554 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2555 IEEE80211_TX_INTFL_MLME_CONN_TX;
2556 ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2557 elems.challenge - 2, elems.challenge_len + 2,
2558 auth_data->bss->bssid, auth_data->bss->bssid,
2559 auth_data->key, auth_data->key_len,
2560 auth_data->key_idx, tx_flags);
2561 }
2562
2563 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2564 struct ieee80211_mgmt *mgmt, size_t len)
2565 {
2566 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2567 u8 bssid[ETH_ALEN];
2568 u16 auth_alg, auth_transaction, status_code;
2569 struct sta_info *sta;
2570 struct ieee80211_event event = {
2571 .type = MLME_EVENT,
2572 .u.mlme.data = AUTH_EVENT,
2573 };
2574
2575 sdata_assert_lock(sdata);
2576
2577 if (len < 24 + 6)
2578 return;
2579
2580 if (!ifmgd->auth_data || ifmgd->auth_data->done)
2581 return;
2582
2583 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2584
2585 if (!ether_addr_equal(bssid, mgmt->bssid))
2586 return;
2587
2588 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2589 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2590 status_code = le16_to_cpu(mgmt->u.auth.status_code);
2591
2592 if (auth_alg != ifmgd->auth_data->algorithm ||
2593 auth_transaction != ifmgd->auth_data->expected_transaction) {
2594 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2595 mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2596 auth_transaction,
2597 ifmgd->auth_data->expected_transaction);
2598 return;
2599 }
2600
2601 if (status_code != WLAN_STATUS_SUCCESS) {
2602 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2603 mgmt->sa, status_code);
2604 ieee80211_destroy_auth_data(sdata, false);
2605 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2606 event.u.mlme.status = MLME_DENIED;
2607 event.u.mlme.reason = status_code;
2608 drv_event_callback(sdata->local, sdata, &event);
2609 return;
2610 }
2611
2612 switch (ifmgd->auth_data->algorithm) {
2613 case WLAN_AUTH_OPEN:
2614 case WLAN_AUTH_LEAP:
2615 case WLAN_AUTH_FT:
2616 case WLAN_AUTH_SAE:
2617 break;
2618 case WLAN_AUTH_SHARED_KEY:
2619 if (ifmgd->auth_data->expected_transaction != 4) {
2620 ieee80211_auth_challenge(sdata, mgmt, len);
2621 /* need another frame */
2622 return;
2623 }
2624 break;
2625 default:
2626 WARN_ONCE(1, "invalid auth alg %d",
2627 ifmgd->auth_data->algorithm);
2628 return;
2629 }
2630
2631 event.u.mlme.status = MLME_SUCCESS;
2632 drv_event_callback(sdata->local, sdata, &event);
2633 sdata_info(sdata, "authenticated\n");
2634 ifmgd->auth_data->done = true;
2635 ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2636 ifmgd->auth_data->timeout_started = true;
2637 run_again(sdata, ifmgd->auth_data->timeout);
2638
2639 if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2640 ifmgd->auth_data->expected_transaction != 2) {
2641 /*
2642 * Report auth frame to user space for processing since another
2643 * round of Authentication frames is still needed.
2644 */
2645 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2646 return;
2647 }
2648
2649 /* move station state to auth */
2650 mutex_lock(&sdata->local->sta_mtx);
2651 sta = sta_info_get(sdata, bssid);
2652 if (!sta) {
2653 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2654 goto out_err;
2655 }
2656 if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2657 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2658 goto out_err;
2659 }
2660 mutex_unlock(&sdata->local->sta_mtx);
2661
2662 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2663 return;
2664 out_err:
2665 mutex_unlock(&sdata->local->sta_mtx);
2666 /* ignore frame -- wait for timeout */
2667 }
2668
2669 #define case_WLAN(type) \
2670 case WLAN_REASON_##type: return #type
2671
2672 static const char *ieee80211_get_reason_code_string(u16 reason_code)
2673 {
2674 switch (reason_code) {
2675 case_WLAN(UNSPECIFIED);
2676 case_WLAN(PREV_AUTH_NOT_VALID);
2677 case_WLAN(DEAUTH_LEAVING);
2678 case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2679 case_WLAN(DISASSOC_AP_BUSY);
2680 case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2681 case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2682 case_WLAN(DISASSOC_STA_HAS_LEFT);
2683 case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2684 case_WLAN(DISASSOC_BAD_POWER);
2685 case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2686 case_WLAN(INVALID_IE);
2687 case_WLAN(MIC_FAILURE);
2688 case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2689 case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2690 case_WLAN(IE_DIFFERENT);
2691 case_WLAN(INVALID_GROUP_CIPHER);
2692 case_WLAN(INVALID_PAIRWISE_CIPHER);
2693 case_WLAN(INVALID_AKMP);
2694 case_WLAN(UNSUPP_RSN_VERSION);
2695 case_WLAN(INVALID_RSN_IE_CAP);
2696 case_WLAN(IEEE8021X_FAILED);
2697 case_WLAN(CIPHER_SUITE_REJECTED);
2698 case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2699 case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2700 case_WLAN(DISASSOC_LOW_ACK);
2701 case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2702 case_WLAN(QSTA_LEAVE_QBSS);
2703 case_WLAN(QSTA_NOT_USE);
2704 case_WLAN(QSTA_REQUIRE_SETUP);
2705 case_WLAN(QSTA_TIMEOUT);
2706 case_WLAN(QSTA_CIPHER_NOT_SUPP);
2707 case_WLAN(MESH_PEER_CANCELED);
2708 case_WLAN(MESH_MAX_PEERS);
2709 case_WLAN(MESH_CONFIG);
2710 case_WLAN(MESH_CLOSE);
2711 case_WLAN(MESH_MAX_RETRIES);
2712 case_WLAN(MESH_CONFIRM_TIMEOUT);
2713 case_WLAN(MESH_INVALID_GTK);
2714 case_WLAN(MESH_INCONSISTENT_PARAM);
2715 case_WLAN(MESH_INVALID_SECURITY);
2716 case_WLAN(MESH_PATH_ERROR);
2717 case_WLAN(MESH_PATH_NOFORWARD);
2718 case_WLAN(MESH_PATH_DEST_UNREACHABLE);
2719 case_WLAN(MAC_EXISTS_IN_MBSS);
2720 case_WLAN(MESH_CHAN_REGULATORY);
2721 case_WLAN(MESH_CHAN);
2722 default: return "<unknown>";
2723 }
2724 }
2725
2726 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2727 struct ieee80211_mgmt *mgmt, size_t len)
2728 {
2729 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2730 u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2731
2732 sdata_assert_lock(sdata);
2733
2734 if (len < 24 + 2)
2735 return;
2736
2737 if (ifmgd->associated &&
2738 ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) {
2739 const u8 *bssid = ifmgd->associated->bssid;
2740
2741 sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
2742 bssid, reason_code,
2743 ieee80211_get_reason_code_string(reason_code));
2744
2745 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2746
2747 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false,
2748 reason_code);
2749 return;
2750 }
2751
2752 if (ifmgd->assoc_data &&
2753 ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2754 const u8 *bssid = ifmgd->assoc_data->bss->bssid;
2755
2756 sdata_info(sdata,
2757 "deauthenticated from %pM while associating (Reason: %u=%s)\n",
2758 bssid, reason_code,
2759 ieee80211_get_reason_code_string(reason_code));
2760
2761 ieee80211_destroy_assoc_data(sdata, false);
2762
2763 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2764 return;
2765 }
2766 }
2767
2768
2769 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2770 struct ieee80211_mgmt *mgmt, size_t len)
2771 {
2772 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2773 u16 reason_code;
2774
2775 sdata_assert_lock(sdata);
2776
2777 if (len < 24 + 2)
2778 return;
2779
2780 if (!ifmgd->associated ||
2781 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2782 return;
2783
2784 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2785
2786 sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2787 mgmt->sa, reason_code);
2788
2789 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2790
2791 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code);
2792 }
2793
2794 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2795 u8 *supp_rates, unsigned int supp_rates_len,
2796 u32 *rates, u32 *basic_rates,
2797 bool *have_higher_than_11mbit,
2798 int *min_rate, int *min_rate_index,
2799 int shift, u32 rate_flags)
2800 {
2801 int i, j;
2802
2803 for (i = 0; i < supp_rates_len; i++) {
2804 int rate = supp_rates[i] & 0x7f;
2805 bool is_basic = !!(supp_rates[i] & 0x80);
2806
2807 if ((rate * 5 * (1 << shift)) > 110)
2808 *have_higher_than_11mbit = true;
2809
2810 /*
2811 * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2812 * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2813 *
2814 * Note: Even through the membership selector and the basic
2815 * rate flag share the same bit, they are not exactly
2816 * the same.
2817 */
2818 if (!!(supp_rates[i] & 0x80) &&
2819 (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2820 continue;
2821
2822 for (j = 0; j < sband->n_bitrates; j++) {
2823 struct ieee80211_rate *br;
2824 int brate;
2825
2826 br = &sband->bitrates[j];
2827 if ((rate_flags & br->flags) != rate_flags)
2828 continue;
2829
2830 brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2831 if (brate == rate) {
2832 *rates |= BIT(j);
2833 if (is_basic)
2834 *basic_rates |= BIT(j);
2835 if ((rate * 5) < *min_rate) {
2836 *min_rate = rate * 5;
2837 *min_rate_index = j;
2838 }
2839 break;
2840 }
2841 }
2842 }
2843 }
2844
2845 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2846 struct cfg80211_bss *cbss,
2847 struct ieee80211_mgmt *mgmt, size_t len)
2848 {
2849 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2850 struct ieee80211_local *local = sdata->local;
2851 struct ieee80211_supported_band *sband;
2852 struct sta_info *sta;
2853 u8 *pos;
2854 u16 capab_info, aid;
2855 struct ieee802_11_elems elems;
2856 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2857 const struct cfg80211_bss_ies *bss_ies = NULL;
2858 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2859 u32 changed = 0;
2860 int err;
2861 bool ret;
2862
2863 /* AssocResp and ReassocResp have identical structure */
2864
2865 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2866 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2867
2868 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2869 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2870 aid);
2871 aid &= ~(BIT(15) | BIT(14));
2872
2873 ifmgd->broken_ap = false;
2874
2875 if (aid == 0 || aid > IEEE80211_MAX_AID) {
2876 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2877 aid);
2878 aid = 0;
2879 ifmgd->broken_ap = true;
2880 }
2881
2882 pos = mgmt->u.assoc_resp.variable;
2883 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2884
2885 if (!elems.supp_rates) {
2886 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2887 return false;
2888 }
2889
2890 ifmgd->aid = aid;
2891 ifmgd->tdls_chan_switch_prohibited =
2892 elems.ext_capab && elems.ext_capab_len >= 5 &&
2893 (elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
2894
2895 /*
2896 * Some APs are erroneously not including some information in their
2897 * (re)association response frames. Try to recover by using the data
2898 * from the beacon or probe response. This seems to afflict mobile
2899 * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2900 * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2901 */
2902 if ((assoc_data->wmm && !elems.wmm_param) ||
2903 (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2904 (!elems.ht_cap_elem || !elems.ht_operation)) ||
2905 (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2906 (!elems.vht_cap_elem || !elems.vht_operation))) {
2907 const struct cfg80211_bss_ies *ies;
2908 struct ieee802_11_elems bss_elems;
2909
2910 rcu_read_lock();
2911 ies = rcu_dereference(cbss->ies);
2912 if (ies)
2913 bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2914 GFP_ATOMIC);
2915 rcu_read_unlock();
2916 if (!bss_ies)
2917 return false;
2918
2919 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2920 false, &bss_elems);
2921 if (assoc_data->wmm &&
2922 !elems.wmm_param && bss_elems.wmm_param) {
2923 elems.wmm_param = bss_elems.wmm_param;
2924 sdata_info(sdata,
2925 "AP bug: WMM param missing from AssocResp\n");
2926 }
2927
2928 /*
2929 * Also check if we requested HT/VHT, otherwise the AP doesn't
2930 * have to include the IEs in the (re)association response.
2931 */
2932 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2933 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2934 elems.ht_cap_elem = bss_elems.ht_cap_elem;
2935 sdata_info(sdata,
2936 "AP bug: HT capability missing from AssocResp\n");
2937 }
2938 if (!elems.ht_operation && bss_elems.ht_operation &&
2939 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2940 elems.ht_operation = bss_elems.ht_operation;
2941 sdata_info(sdata,
2942 "AP bug: HT operation missing from AssocResp\n");
2943 }
2944 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2945 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2946 elems.vht_cap_elem = bss_elems.vht_cap_elem;
2947 sdata_info(sdata,
2948 "AP bug: VHT capa missing from AssocResp\n");
2949 }
2950 if (!elems.vht_operation && bss_elems.vht_operation &&
2951 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2952 elems.vht_operation = bss_elems.vht_operation;
2953 sdata_info(sdata,
2954 "AP bug: VHT operation missing from AssocResp\n");
2955 }
2956 }
2957
2958 /*
2959 * We previously checked these in the beacon/probe response, so
2960 * they should be present here. This is just a safety net.
2961 */
2962 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2963 (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2964 sdata_info(sdata,
2965 "HT AP is missing WMM params or HT capability/operation\n");
2966 ret = false;
2967 goto out;
2968 }
2969
2970 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2971 (!elems.vht_cap_elem || !elems.vht_operation)) {
2972 sdata_info(sdata,
2973 "VHT AP is missing VHT capability/operation\n");
2974 ret = false;
2975 goto out;
2976 }
2977
2978 mutex_lock(&sdata->local->sta_mtx);
2979 /*
2980 * station info was already allocated and inserted before
2981 * the association and should be available to us
2982 */
2983 sta = sta_info_get(sdata, cbss->bssid);
2984 if (WARN_ON(!sta)) {
2985 mutex_unlock(&sdata->local->sta_mtx);
2986 ret = false;
2987 goto out;
2988 }
2989
2990 sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2991
2992 /* Set up internal HT/VHT capabilities */
2993 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2994 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2995 elems.ht_cap_elem, sta);
2996
2997 if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
2998 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2999 elems.vht_cap_elem, sta);
3000
3001 /*
3002 * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
3003 * in their association response, so ignore that data for our own
3004 * configuration. If it changed since the last beacon, we'll get the
3005 * next beacon and update then.
3006 */
3007
3008 /*
3009 * If an operating mode notification IE is present, override the
3010 * NSS calculation (that would be done in rate_control_rate_init())
3011 * and use the # of streams from that element.
3012 */
3013 if (elems.opmode_notif &&
3014 !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
3015 u8 nss;
3016
3017 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
3018 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
3019 nss += 1;
3020 sta->sta.rx_nss = nss;
3021 }
3022
3023 rate_control_rate_init(sta);
3024
3025 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) {
3026 set_sta_flag(sta, WLAN_STA_MFP);
3027 sta->sta.mfp = true;
3028 } else {
3029 sta->sta.mfp = false;
3030 }
3031
3032 sta->sta.wme = elems.wmm_param && local->hw.queues >= IEEE80211_NUM_ACS;
3033
3034 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
3035 if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
3036 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
3037 if (err) {
3038 sdata_info(sdata,
3039 "failed to move station %pM to desired state\n",
3040 sta->sta.addr);
3041 WARN_ON(__sta_info_destroy(sta));
3042 mutex_unlock(&sdata->local->sta_mtx);
3043 ret = false;
3044 goto out;
3045 }
3046
3047 mutex_unlock(&sdata->local->sta_mtx);
3048
3049 /*
3050 * Always handle WMM once after association regardless
3051 * of the first value the AP uses. Setting -1 here has
3052 * that effect because the AP values is an unsigned
3053 * 4-bit value.
3054 */
3055 ifmgd->wmm_last_param_set = -1;
3056
3057 if (ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
3058 ieee80211_set_wmm_default(sdata, false, false);
3059 } else if (!ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3060 elems.wmm_param_len)) {
3061 /* still enable QoS since we might have HT/VHT */
3062 ieee80211_set_wmm_default(sdata, false, true);
3063 /* set the disable-WMM flag in this case to disable
3064 * tracking WMM parameter changes in the beacon if
3065 * the parameters weren't actually valid. Doing so
3066 * avoids changing parameters very strangely when
3067 * the AP is going back and forth between valid and
3068 * invalid parameters.
3069 */
3070 ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
3071 }
3072 changed |= BSS_CHANGED_QOS;
3073
3074 /* set AID and assoc capability,
3075 * ieee80211_set_associated() will tell the driver */
3076 bss_conf->aid = aid;
3077 bss_conf->assoc_capability = capab_info;
3078 ieee80211_set_associated(sdata, cbss, changed);
3079
3080 /*
3081 * If we're using 4-addr mode, let the AP know that we're
3082 * doing so, so that it can create the STA VLAN on its side
3083 */
3084 if (ifmgd->use_4addr)
3085 ieee80211_send_4addr_nullfunc(local, sdata);
3086
3087 /*
3088 * Start timer to probe the connection to the AP now.
3089 * Also start the timer that will detect beacon loss.
3090 */
3091 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
3092 ieee80211_sta_reset_beacon_monitor(sdata);
3093
3094 ret = true;
3095 out:
3096 kfree(bss_ies);
3097 return ret;
3098 }
3099
3100 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
3101 struct ieee80211_mgmt *mgmt,
3102 size_t len)
3103 {
3104 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3105 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
3106 u16 capab_info, status_code, aid;
3107 struct ieee802_11_elems elems;
3108 int ac, uapsd_queues = -1;
3109 u8 *pos;
3110 bool reassoc;
3111 struct cfg80211_bss *bss;
3112 struct ieee80211_event event = {
3113 .type = MLME_EVENT,
3114 .u.mlme.data = ASSOC_EVENT,
3115 };
3116
3117 sdata_assert_lock(sdata);
3118
3119 if (!assoc_data)
3120 return;
3121 if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3122 return;
3123
3124 /*
3125 * AssocResp and ReassocResp have identical structure, so process both
3126 * of them in this function.
3127 */
3128
3129 if (len < 24 + 6)
3130 return;
3131
3132 reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
3133 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
3134 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
3135 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
3136
3137 sdata_info(sdata,
3138 "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
3139 reassoc ? "Rea" : "A", mgmt->sa,
3140 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
3141
3142 pos = mgmt->u.assoc_resp.variable;
3143 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
3144
3145 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3146 elems.timeout_int &&
3147 elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
3148 u32 tu, ms;
3149 tu = le32_to_cpu(elems.timeout_int->value);
3150 ms = tu * 1024 / 1000;
3151 sdata_info(sdata,
3152 "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
3153 mgmt->sa, tu, ms);
3154 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3155 assoc_data->timeout_started = true;
3156 if (ms > IEEE80211_ASSOC_TIMEOUT)
3157 run_again(sdata, assoc_data->timeout);
3158 return;
3159 }
3160
3161 bss = assoc_data->bss;
3162
3163 if (status_code != WLAN_STATUS_SUCCESS) {
3164 sdata_info(sdata, "%pM denied association (code=%d)\n",
3165 mgmt->sa, status_code);
3166 ieee80211_destroy_assoc_data(sdata, false);
3167 event.u.mlme.status = MLME_DENIED;
3168 event.u.mlme.reason = status_code;
3169 drv_event_callback(sdata->local, sdata, &event);
3170 } else {
3171 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
3172 /* oops -- internal error -- send timeout for now */
3173 ieee80211_destroy_assoc_data(sdata, false);
3174 cfg80211_assoc_timeout(sdata->dev, bss);
3175 return;
3176 }
3177 event.u.mlme.status = MLME_SUCCESS;
3178 drv_event_callback(sdata->local, sdata, &event);
3179 sdata_info(sdata, "associated\n");
3180
3181 /*
3182 * destroy assoc_data afterwards, as otherwise an idle
3183 * recalc after assoc_data is NULL but before associated
3184 * is set can cause the interface to go idle
3185 */
3186 ieee80211_destroy_assoc_data(sdata, true);
3187
3188 /* get uapsd queues configuration */
3189 uapsd_queues = 0;
3190 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
3191 if (sdata->tx_conf[ac].uapsd)
3192 uapsd_queues |= BIT(ac);
3193 }
3194
3195 cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
3196 }
3197
3198 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
3199 struct ieee80211_mgmt *mgmt, size_t len,
3200 struct ieee80211_rx_status *rx_status,
3201 struct ieee802_11_elems *elems)
3202 {
3203 struct ieee80211_local *local = sdata->local;
3204 struct ieee80211_bss *bss;
3205 struct ieee80211_channel *channel;
3206
3207 sdata_assert_lock(sdata);
3208
3209 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
3210 if (!channel)
3211 return;
3212
3213 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3214 channel);
3215 if (bss) {
3216 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3217 ieee80211_rx_bss_put(local, bss);
3218 }
3219 }
3220
3221
3222 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
3223 struct sk_buff *skb)
3224 {
3225 struct ieee80211_mgmt *mgmt = (void *)skb->data;
3226 struct ieee80211_if_managed *ifmgd;
3227 struct ieee80211_rx_status *rx_status = (void *) skb->cb;
3228 size_t baselen, len = skb->len;
3229 struct ieee802_11_elems elems;
3230
3231 ifmgd = &sdata->u.mgd;
3232
3233 sdata_assert_lock(sdata);
3234
3235 if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3236 return; /* ignore ProbeResp to foreign address */
3237
3238 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
3239 if (baselen > len)
3240 return;
3241
3242 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3243 false, &elems);
3244
3245 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3246
3247 if (ifmgd->associated &&
3248 ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3249 ieee80211_reset_ap_probe(sdata);
3250 }
3251
3252 /*
3253 * This is the canonical list of information elements we care about,
3254 * the filter code also gives us all changes to the Microsoft OUI
3255 * (00:50:F2) vendor IE which is used for WMM which we need to track,
3256 * as well as the DTPC IE (part of the Cisco OUI) used for signaling
3257 * changes to requested client power.
3258 *
3259 * We implement beacon filtering in software since that means we can
3260 * avoid processing the frame here and in cfg80211, and userspace
3261 * will not be able to tell whether the hardware supports it or not.
3262 *
3263 * XXX: This list needs to be dynamic -- userspace needs to be able to
3264 * add items it requires. It also needs to be able to tell us to
3265 * look out for other vendor IEs.
3266 */
3267 static const u64 care_about_ies =
3268 (1ULL << WLAN_EID_COUNTRY) |
3269 (1ULL << WLAN_EID_ERP_INFO) |
3270 (1ULL << WLAN_EID_CHANNEL_SWITCH) |
3271 (1ULL << WLAN_EID_PWR_CONSTRAINT) |
3272 (1ULL << WLAN_EID_HT_CAPABILITY) |
3273 (1ULL << WLAN_EID_HT_OPERATION) |
3274 (1ULL << WLAN_EID_EXT_CHANSWITCH_ANN);
3275
3276 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
3277 struct ieee80211_mgmt *mgmt, size_t len,
3278 struct ieee80211_rx_status *rx_status)
3279 {
3280 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3281 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3282 size_t baselen;
3283 struct ieee802_11_elems elems;
3284 struct ieee80211_local *local = sdata->local;
3285 struct ieee80211_chanctx_conf *chanctx_conf;
3286 struct ieee80211_channel *chan;
3287 struct sta_info *sta;
3288 u32 changed = 0;
3289 bool erp_valid;
3290 u8 erp_value = 0;
3291 u32 ncrc;
3292 u8 *bssid;
3293 u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3294
3295 sdata_assert_lock(sdata);
3296
3297 /* Process beacon from the current BSS */
3298 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
3299 if (baselen > len)
3300 return;
3301
3302 rcu_read_lock();
3303 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3304 if (!chanctx_conf) {
3305 rcu_read_unlock();
3306 return;
3307 }
3308
3309 if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
3310 rcu_read_unlock();
3311 return;
3312 }
3313 chan = chanctx_conf->def.chan;
3314 rcu_read_unlock();
3315
3316 if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3317 ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
3318 ieee802_11_parse_elems(mgmt->u.beacon.variable,
3319 len - baselen, false, &elems);
3320
3321 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3322 if (elems.tim && !elems.parse_error) {
3323 const struct ieee80211_tim_ie *tim_ie = elems.tim;
3324 ifmgd->dtim_period = tim_ie->dtim_period;
3325 }
3326 ifmgd->have_beacon = true;
3327 ifmgd->assoc_data->need_beacon = false;
3328 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3329 sdata->vif.bss_conf.sync_tsf =
3330 le64_to_cpu(mgmt->u.beacon.timestamp);
3331 sdata->vif.bss_conf.sync_device_ts =
3332 rx_status->device_timestamp;
3333 if (elems.tim)
3334 sdata->vif.bss_conf.sync_dtim_count =
3335 elems.tim->dtim_count;
3336 else
3337 sdata->vif.bss_conf.sync_dtim_count = 0;
3338 }
3339 /* continue assoc process */
3340 ifmgd->assoc_data->timeout = jiffies;
3341 ifmgd->assoc_data->timeout_started = true;
3342 run_again(sdata, ifmgd->assoc_data->timeout);
3343 return;
3344 }
3345
3346 if (!ifmgd->associated ||
3347 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3348 return;
3349 bssid = ifmgd->associated->bssid;
3350
3351 /* Track average RSSI from the Beacon frames of the current AP */
3352 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
3353 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3354 ewma_beacon_signal_init(&ifmgd->ave_beacon_signal);
3355 ifmgd->last_cqm_event_signal = 0;
3356 ifmgd->count_beacon_signal = 1;
3357 ifmgd->last_ave_beacon_signal = 0;
3358 } else {
3359 ifmgd->count_beacon_signal++;
3360 }
3361
3362 ewma_beacon_signal_add(&ifmgd->ave_beacon_signal, -rx_status->signal);
3363
3364 if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3365 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3366 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3367 int last_sig = ifmgd->last_ave_beacon_signal;
3368 struct ieee80211_event event = {
3369 .type = RSSI_EVENT,
3370 };
3371
3372 /*
3373 * if signal crosses either of the boundaries, invoke callback
3374 * with appropriate parameters
3375 */
3376 if (sig > ifmgd->rssi_max_thold &&
3377 (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3378 ifmgd->last_ave_beacon_signal = sig;
3379 event.u.rssi.data = RSSI_EVENT_HIGH;
3380 drv_event_callback(local, sdata, &event);
3381 } else if (sig < ifmgd->rssi_min_thold &&
3382 (last_sig >= ifmgd->rssi_max_thold ||
3383 last_sig == 0)) {
3384 ifmgd->last_ave_beacon_signal = sig;
3385 event.u.rssi.data = RSSI_EVENT_LOW;
3386 drv_event_callback(local, sdata, &event);
3387 }
3388 }
3389
3390 if (bss_conf->cqm_rssi_thold &&
3391 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3392 !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3393 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3394 int last_event = ifmgd->last_cqm_event_signal;
3395 int thold = bss_conf->cqm_rssi_thold;
3396 int hyst = bss_conf->cqm_rssi_hyst;
3397
3398 if (sig < thold &&
3399 (last_event == 0 || sig < last_event - hyst)) {
3400 ifmgd->last_cqm_event_signal = sig;
3401 ieee80211_cqm_rssi_notify(
3402 &sdata->vif,
3403 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3404 GFP_KERNEL);
3405 } else if (sig > thold &&
3406 (last_event == 0 || sig > last_event + hyst)) {
3407 ifmgd->last_cqm_event_signal = sig;
3408 ieee80211_cqm_rssi_notify(
3409 &sdata->vif,
3410 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3411 GFP_KERNEL);
3412 }
3413 }
3414
3415 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3416 mlme_dbg_ratelimited(sdata,
3417 "cancelling AP probe due to a received beacon\n");
3418 ieee80211_reset_ap_probe(sdata);
3419 }
3420
3421 /*
3422 * Push the beacon loss detection into the future since
3423 * we are processing a beacon from the AP just now.
3424 */
3425 ieee80211_sta_reset_beacon_monitor(sdata);
3426
3427 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3428 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3429 len - baselen, false, &elems,
3430 care_about_ies, ncrc);
3431
3432 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
3433 ieee80211_check_tim(elems.tim, elems.tim_len, ifmgd->aid)) {
3434 if (local->hw.conf.dynamic_ps_timeout > 0) {
3435 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3436 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3437 ieee80211_hw_config(local,
3438 IEEE80211_CONF_CHANGE_PS);
3439 }
3440 ieee80211_send_nullfunc(local, sdata, false);
3441 } else if (!local->pspolling && sdata->u.mgd.powersave) {
3442 local->pspolling = true;
3443
3444 /*
3445 * Here is assumed that the driver will be
3446 * able to send ps-poll frame and receive a
3447 * response even though power save mode is
3448 * enabled, but some drivers might require
3449 * to disable power save here. This needs
3450 * to be investigated.
3451 */
3452 ieee80211_send_pspoll(local, sdata);
3453 }
3454 }
3455
3456 if (sdata->vif.p2p ||
3457 sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) {
3458 struct ieee80211_p2p_noa_attr noa = {};
3459 int ret;
3460
3461 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3462 len - baselen,
3463 IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3464 (u8 *) &noa, sizeof(noa));
3465 if (ret >= 2) {
3466 if (sdata->u.mgd.p2p_noa_index != noa.index) {
3467 /* valid noa_attr and index changed */
3468 sdata->u.mgd.p2p_noa_index = noa.index;
3469 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3470 changed |= BSS_CHANGED_P2P_PS;
3471 /*
3472 * make sure we update all information, the CRC
3473 * mechanism doesn't look at P2P attributes.
3474 */
3475 ifmgd->beacon_crc_valid = false;
3476 }
3477 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3478 /* noa_attr not found and we had valid noa_attr before */
3479 sdata->u.mgd.p2p_noa_index = -1;
3480 memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3481 changed |= BSS_CHANGED_P2P_PS;
3482 ifmgd->beacon_crc_valid = false;
3483 }
3484 }
3485
3486 if (ifmgd->csa_waiting_bcn)
3487 ieee80211_chswitch_post_beacon(sdata);
3488
3489 /*
3490 * Update beacon timing and dtim count on every beacon appearance. This
3491 * will allow the driver to use the most updated values. Do it before
3492 * comparing this one with last received beacon.
3493 * IMPORTANT: These parameters would possibly be out of sync by the time
3494 * the driver will use them. The synchronized view is currently
3495 * guaranteed only in certain callbacks.
3496 */
3497 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3498 sdata->vif.bss_conf.sync_tsf =
3499 le64_to_cpu(mgmt->u.beacon.timestamp);
3500 sdata->vif.bss_conf.sync_device_ts =
3501 rx_status->device_timestamp;
3502 if (elems.tim)
3503 sdata->vif.bss_conf.sync_dtim_count =
3504 elems.tim->dtim_count;
3505 else
3506 sdata->vif.bss_conf.sync_dtim_count = 0;
3507 }
3508
3509 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3510 return;
3511 ifmgd->beacon_crc = ncrc;
3512 ifmgd->beacon_crc_valid = true;
3513
3514 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3515
3516 ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3517 rx_status->device_timestamp,
3518 &elems, true);
3519
3520 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3521 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3522 elems.wmm_param_len))
3523 changed |= BSS_CHANGED_QOS;
3524
3525 /*
3526 * If we haven't had a beacon before, tell the driver about the
3527 * DTIM period (and beacon timing if desired) now.
3528 */
3529 if (!ifmgd->have_beacon) {
3530 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3531 if (elems.tim)
3532 bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3533 else
3534 bss_conf->dtim_period = 1;
3535
3536 changed |= BSS_CHANGED_BEACON_INFO;
3537 ifmgd->have_beacon = true;
3538
3539 mutex_lock(&local->iflist_mtx);
3540 ieee80211_recalc_ps(local);
3541 mutex_unlock(&local->iflist_mtx);
3542
3543 ieee80211_recalc_ps_vif(sdata);
3544 }
3545
3546 if (elems.erp_info) {
3547 erp_valid = true;
3548 erp_value = elems.erp_info[0];
3549 } else {
3550 erp_valid = false;
3551 }
3552 changed |= ieee80211_handle_bss_capability(sdata,
3553 le16_to_cpu(mgmt->u.beacon.capab_info),
3554 erp_valid, erp_value);
3555
3556 mutex_lock(&local->sta_mtx);
3557 sta = sta_info_get(sdata, bssid);
3558
3559 if (ieee80211_config_bw(sdata, sta,
3560 elems.ht_cap_elem, elems.ht_operation,
3561 elems.vht_operation, bssid, &changed)) {
3562 mutex_unlock(&local->sta_mtx);
3563 sdata_info(sdata,
3564 "failed to follow AP %pM bandwidth change, disconnect\n",
3565 bssid);
3566 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3567 WLAN_REASON_DEAUTH_LEAVING,
3568 true, deauth_buf);
3569 ieee80211_report_disconnect(sdata, deauth_buf,
3570 sizeof(deauth_buf), true,
3571 WLAN_REASON_DEAUTH_LEAVING);
3572 return;
3573 }
3574
3575 if (sta && elems.opmode_notif)
3576 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3577 rx_status->band);
3578 mutex_unlock(&local->sta_mtx);
3579
3580 changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
3581 elems.country_elem,
3582 elems.country_elem_len,
3583 elems.pwr_constr_elem,
3584 elems.cisco_dtpc_elem);
3585
3586 ieee80211_bss_info_change_notify(sdata, changed);
3587 }
3588
3589 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3590 struct sk_buff *skb)
3591 {
3592 struct ieee80211_rx_status *rx_status;
3593 struct ieee80211_mgmt *mgmt;
3594 u16 fc;
3595 struct ieee802_11_elems elems;
3596 int ies_len;
3597
3598 rx_status = (struct ieee80211_rx_status *) skb->cb;
3599 mgmt = (struct ieee80211_mgmt *) skb->data;
3600 fc = le16_to_cpu(mgmt->frame_control);
3601
3602 sdata_lock(sdata);
3603
3604 switch (fc & IEEE80211_FCTL_STYPE) {
3605 case IEEE80211_STYPE_BEACON:
3606 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3607 break;
3608 case IEEE80211_STYPE_PROBE_RESP:
3609 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3610 break;
3611 case IEEE80211_STYPE_AUTH:
3612 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3613 break;
3614 case IEEE80211_STYPE_DEAUTH:
3615 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3616 break;
3617 case IEEE80211_STYPE_DISASSOC:
3618 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3619 break;
3620 case IEEE80211_STYPE_ASSOC_RESP:
3621 case IEEE80211_STYPE_REASSOC_RESP:
3622 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3623 break;
3624 case IEEE80211_STYPE_ACTION:
3625 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3626 ies_len = skb->len -
3627 offsetof(struct ieee80211_mgmt,
3628 u.action.u.chan_switch.variable);
3629
3630 if (ies_len < 0)
3631 break;
3632
3633 ieee802_11_parse_elems(
3634 mgmt->u.action.u.chan_switch.variable,
3635 ies_len, true, &elems);
3636
3637 if (elems.parse_error)
3638 break;
3639
3640 ieee80211_sta_process_chanswitch(sdata,
3641 rx_status->mactime,
3642 rx_status->device_timestamp,
3643 &elems, false);
3644 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3645 ies_len = skb->len -
3646 offsetof(struct ieee80211_mgmt,
3647 u.action.u.ext_chan_switch.variable);
3648
3649 if (ies_len < 0)
3650 break;
3651
3652 ieee802_11_parse_elems(
3653 mgmt->u.action.u.ext_chan_switch.variable,
3654 ies_len, true, &elems);
3655
3656 if (elems.parse_error)
3657 break;
3658
3659 /* for the handling code pretend this was also an IE */
3660 elems.ext_chansw_ie =
3661 &mgmt->u.action.u.ext_chan_switch.data;
3662
3663 ieee80211_sta_process_chanswitch(sdata,
3664 rx_status->mactime,
3665 rx_status->device_timestamp,
3666 &elems, false);
3667 }
3668 break;
3669 }
3670 sdata_unlock(sdata);
3671 }
3672
3673 static void ieee80211_sta_timer(unsigned long data)
3674 {
3675 struct ieee80211_sub_if_data *sdata =
3676 (struct ieee80211_sub_if_data *) data;
3677
3678 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3679 }
3680
3681 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3682 u8 *bssid, u8 reason, bool tx)
3683 {
3684 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3685
3686 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3687 tx, frame_buf);
3688
3689 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
3690 reason);
3691 }
3692
3693 static int ieee80211_auth(struct ieee80211_sub_if_data *sdata)
3694 {
3695 struct ieee80211_local *local = sdata->local;
3696 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3697 struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3698 u32 tx_flags = 0;
3699 u16 trans = 1;
3700 u16 status = 0;
3701
3702 sdata_assert_lock(sdata);
3703
3704 if (WARN_ON_ONCE(!auth_data))
3705 return -EINVAL;
3706
3707 auth_data->tries++;
3708
3709 if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3710 sdata_info(sdata, "authentication with %pM timed out\n",
3711 auth_data->bss->bssid);
3712
3713 /*
3714 * Most likely AP is not in the range so remove the
3715 * bss struct for that AP.
3716 */
3717 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3718
3719 return -ETIMEDOUT;
3720 }
3721
3722 drv_mgd_prepare_tx(local, sdata);
3723
3724 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3725 auth_data->bss->bssid, auth_data->tries,
3726 IEEE80211_AUTH_MAX_TRIES);
3727
3728 auth_data->expected_transaction = 2;
3729
3730 if (auth_data->algorithm == WLAN_AUTH_SAE) {
3731 trans = auth_data->sae_trans;
3732 status = auth_data->sae_status;
3733 auth_data->expected_transaction = trans;
3734 }
3735
3736 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3737 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3738 IEEE80211_TX_INTFL_MLME_CONN_TX;
3739
3740 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3741 auth_data->data, auth_data->data_len,
3742 auth_data->bss->bssid,
3743 auth_data->bss->bssid, NULL, 0, 0,
3744 tx_flags);
3745
3746 if (tx_flags == 0) {
3747 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3748 auth_data->timeout_started = true;
3749 run_again(sdata, auth_data->timeout);
3750 } else {
3751 auth_data->timeout =
3752 round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3753 auth_data->timeout_started = true;
3754 run_again(sdata, auth_data->timeout);
3755 }
3756
3757 return 0;
3758 }
3759
3760 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3761 {
3762 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3763 struct ieee80211_local *local = sdata->local;
3764
3765 sdata_assert_lock(sdata);
3766
3767 assoc_data->tries++;
3768 if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3769 sdata_info(sdata, "association with %pM timed out\n",
3770 assoc_data->bss->bssid);
3771
3772 /*
3773 * Most likely AP is not in the range so remove the
3774 * bss struct for that AP.
3775 */
3776 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3777
3778 return -ETIMEDOUT;
3779 }
3780
3781 sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3782 assoc_data->bss->bssid, assoc_data->tries,
3783 IEEE80211_ASSOC_MAX_TRIES);
3784 ieee80211_send_assoc(sdata);
3785
3786 if (!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3787 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3788 assoc_data->timeout_started = true;
3789 run_again(sdata, assoc_data->timeout);
3790 } else {
3791 assoc_data->timeout =
3792 round_jiffies_up(jiffies +
3793 IEEE80211_ASSOC_TIMEOUT_LONG);
3794 assoc_data->timeout_started = true;
3795 run_again(sdata, assoc_data->timeout);
3796 }
3797
3798 return 0;
3799 }
3800
3801 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3802 __le16 fc, bool acked)
3803 {
3804 struct ieee80211_local *local = sdata->local;
3805
3806 sdata->u.mgd.status_fc = fc;
3807 sdata->u.mgd.status_acked = acked;
3808 sdata->u.mgd.status_received = true;
3809
3810 ieee80211_queue_work(&local->hw, &sdata->work);
3811 }
3812
3813 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3814 {
3815 struct ieee80211_local *local = sdata->local;
3816 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3817
3818 sdata_lock(sdata);
3819
3820 if (ifmgd->status_received) {
3821 __le16 fc = ifmgd->status_fc;
3822 bool status_acked = ifmgd->status_acked;
3823
3824 ifmgd->status_received = false;
3825 if (ifmgd->auth_data && ieee80211_is_auth(fc)) {
3826 if (status_acked) {
3827 ifmgd->auth_data->timeout =
3828 jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3829 run_again(sdata, ifmgd->auth_data->timeout);
3830 } else {
3831 ifmgd->auth_data->timeout = jiffies - 1;
3832 }
3833 ifmgd->auth_data->timeout_started = true;
3834 } else if (ifmgd->assoc_data &&
3835 (ieee80211_is_assoc_req(fc) ||
3836 ieee80211_is_reassoc_req(fc))) {
3837 if (status_acked) {
3838 ifmgd->assoc_data->timeout =
3839 jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3840 run_again(sdata, ifmgd->assoc_data->timeout);
3841 } else {
3842 ifmgd->assoc_data->timeout = jiffies - 1;
3843 }
3844 ifmgd->assoc_data->timeout_started = true;
3845 }
3846 }
3847
3848 if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3849 time_after(jiffies, ifmgd->auth_data->timeout)) {
3850 if (ifmgd->auth_data->done) {
3851 /*
3852 * ok ... we waited for assoc but userspace didn't,
3853 * so let's just kill the auth data
3854 */
3855 ieee80211_destroy_auth_data(sdata, false);
3856 } else if (ieee80211_auth(sdata)) {
3857 u8 bssid[ETH_ALEN];
3858 struct ieee80211_event event = {
3859 .type = MLME_EVENT,
3860 .u.mlme.data = AUTH_EVENT,
3861 .u.mlme.status = MLME_TIMEOUT,
3862 };
3863
3864 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3865
3866 ieee80211_destroy_auth_data(sdata, false);
3867
3868 cfg80211_auth_timeout(sdata->dev, bssid);
3869 drv_event_callback(sdata->local, sdata, &event);
3870 }
3871 } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3872 run_again(sdata, ifmgd->auth_data->timeout);
3873
3874 if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3875 time_after(jiffies, ifmgd->assoc_data->timeout)) {
3876 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3877 ieee80211_do_assoc(sdata)) {
3878 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3879 struct ieee80211_event event = {
3880 .type = MLME_EVENT,
3881 .u.mlme.data = ASSOC_EVENT,
3882 .u.mlme.status = MLME_TIMEOUT,
3883 };
3884
3885 ieee80211_destroy_assoc_data(sdata, false);
3886 cfg80211_assoc_timeout(sdata->dev, bss);
3887 drv_event_callback(sdata->local, sdata, &event);
3888 }
3889 } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3890 run_again(sdata, ifmgd->assoc_data->timeout);
3891
3892 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3893 ifmgd->associated) {
3894 u8 bssid[ETH_ALEN];
3895 int max_tries;
3896
3897 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3898
3899 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3900 max_tries = max_nullfunc_tries;
3901 else
3902 max_tries = max_probe_tries;
3903
3904 /* ACK received for nullfunc probing frame */
3905 if (!ifmgd->probe_send_count)
3906 ieee80211_reset_ap_probe(sdata);
3907 else if (ifmgd->nullfunc_failed) {
3908 if (ifmgd->probe_send_count < max_tries) {
3909 mlme_dbg(sdata,
3910 "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3911 bssid, ifmgd->probe_send_count,
3912 max_tries);
3913 ieee80211_mgd_probe_ap_send(sdata);
3914 } else {
3915 mlme_dbg(sdata,
3916 "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3917 bssid);
3918 ieee80211_sta_connection_lost(sdata, bssid,
3919 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3920 false);
3921 }
3922 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3923 run_again(sdata, ifmgd->probe_timeout);
3924 else if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3925 mlme_dbg(sdata,
3926 "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3927 bssid, probe_wait_ms);
3928 ieee80211_sta_connection_lost(sdata, bssid,
3929 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3930 } else if (ifmgd->probe_send_count < max_tries) {
3931 mlme_dbg(sdata,
3932 "No probe response from AP %pM after %dms, try %d/%i\n",
3933 bssid, probe_wait_ms,
3934 ifmgd->probe_send_count, max_tries);
3935 ieee80211_mgd_probe_ap_send(sdata);
3936 } else {
3937 /*
3938 * We actually lost the connection ... or did we?
3939 * Let's make sure!
3940 */
3941 mlme_dbg(sdata,
3942 "No probe response from AP %pM after %dms, disconnecting.\n",
3943 bssid, probe_wait_ms);
3944
3945 ieee80211_sta_connection_lost(sdata, bssid,
3946 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3947 }
3948 }
3949
3950 sdata_unlock(sdata);
3951 }
3952
3953 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3954 {
3955 struct ieee80211_sub_if_data *sdata =
3956 (struct ieee80211_sub_if_data *) data;
3957 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3958
3959 if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3960 return;
3961
3962 sdata->u.mgd.connection_loss = false;
3963 ieee80211_queue_work(&sdata->local->hw,
3964 &sdata->u.mgd.beacon_connection_loss_work);
3965 }
3966
3967 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3968 {
3969 struct ieee80211_sub_if_data *sdata =
3970 (struct ieee80211_sub_if_data *) data;
3971 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3972 struct ieee80211_local *local = sdata->local;
3973
3974 if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3975 return;
3976
3977 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3978 }
3979
3980 static void ieee80211_sta_monitor_work(struct work_struct *work)
3981 {
3982 struct ieee80211_sub_if_data *sdata =
3983 container_of(work, struct ieee80211_sub_if_data,
3984 u.mgd.monitor_work);
3985
3986 ieee80211_mgd_probe_ap(sdata, false);
3987 }
3988
3989 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3990 {
3991 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3992 __ieee80211_stop_poll(sdata);
3993
3994 /* let's probe the connection once */
3995 if (!ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
3996 ieee80211_queue_work(&sdata->local->hw,
3997 &sdata->u.mgd.monitor_work);
3998 }
3999 }
4000
4001 #ifdef CONFIG_PM
4002 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
4003 {
4004 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4005 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4006
4007 sdata_lock(sdata);
4008
4009 if (ifmgd->auth_data || ifmgd->assoc_data) {
4010 const u8 *bssid = ifmgd->auth_data ?
4011 ifmgd->auth_data->bss->bssid :
4012 ifmgd->assoc_data->bss->bssid;
4013
4014 /*
4015 * If we are trying to authenticate / associate while suspending,
4016 * cfg80211 won't know and won't actually abort those attempts,
4017 * thus we need to do that ourselves.
4018 */
4019 ieee80211_send_deauth_disassoc(sdata, bssid,
4020 IEEE80211_STYPE_DEAUTH,
4021 WLAN_REASON_DEAUTH_LEAVING,
4022 false, frame_buf);
4023 if (ifmgd->assoc_data)
4024 ieee80211_destroy_assoc_data(sdata, false);
4025 if (ifmgd->auth_data)
4026 ieee80211_destroy_auth_data(sdata, false);
4027 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4028 IEEE80211_DEAUTH_FRAME_LEN);
4029 }
4030
4031 /* This is a bit of a hack - we should find a better and more generic
4032 * solution to this. Normally when suspending, cfg80211 will in fact
4033 * deauthenticate. However, it doesn't (and cannot) stop an ongoing
4034 * auth (not so important) or assoc (this is the problem) process.
4035 *
4036 * As a consequence, it can happen that we are in the process of both
4037 * associating and suspending, and receive an association response
4038 * after cfg80211 has checked if it needs to disconnect, but before
4039 * we actually set the flag to drop incoming frames. This will then
4040 * cause the workqueue flush to process the association response in
4041 * the suspend, resulting in a successful association just before it
4042 * tries to remove the interface from the driver, which now though
4043 * has a channel context assigned ... this results in issues.
4044 *
4045 * To work around this (for now) simply deauth here again if we're
4046 * now connected.
4047 */
4048 if (ifmgd->associated && !sdata->local->wowlan) {
4049 u8 bssid[ETH_ALEN];
4050 struct cfg80211_deauth_request req = {
4051 .reason_code = WLAN_REASON_DEAUTH_LEAVING,
4052 .bssid = bssid,
4053 };
4054
4055 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
4056 ieee80211_mgd_deauth(sdata, &req);
4057 }
4058
4059 sdata_unlock(sdata);
4060 }
4061
4062 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
4063 {
4064 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4065
4066 sdata_lock(sdata);
4067 if (!ifmgd->associated) {
4068 sdata_unlock(sdata);
4069 return;
4070 }
4071
4072 if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
4073 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
4074 mlme_dbg(sdata, "driver requested disconnect after resume\n");
4075 ieee80211_sta_connection_lost(sdata,
4076 ifmgd->associated->bssid,
4077 WLAN_REASON_UNSPECIFIED,
4078 true);
4079 sdata_unlock(sdata);
4080 return;
4081 }
4082 sdata_unlock(sdata);
4083 }
4084 #endif
4085
4086 /* interface setup */
4087 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
4088 {
4089 struct ieee80211_if_managed *ifmgd;
4090
4091 ifmgd = &sdata->u.mgd;
4092 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
4093 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
4094 INIT_WORK(&ifmgd->beacon_connection_loss_work,
4095 ieee80211_beacon_connection_loss_work);
4096 INIT_WORK(&ifmgd->csa_connection_drop_work,
4097 ieee80211_csa_connection_drop_work);
4098 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
4099 INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
4100 ieee80211_tdls_peer_del_work);
4101 setup_timer(&ifmgd->timer, ieee80211_sta_timer,
4102 (unsigned long) sdata);
4103 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
4104 (unsigned long) sdata);
4105 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
4106 (unsigned long) sdata);
4107 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
4108 (unsigned long) sdata);
4109 INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
4110 ieee80211_sta_handle_tspec_ac_params_wk);
4111
4112 ifmgd->flags = 0;
4113 ifmgd->powersave = sdata->wdev.ps;
4114 ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
4115 ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
4116 ifmgd->p2p_noa_index = -1;
4117
4118 if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4119 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
4120 else
4121 ifmgd->req_smps = IEEE80211_SMPS_OFF;
4122
4123 /* Setup TDLS data */
4124 spin_lock_init(&ifmgd->teardown_lock);
4125 ifmgd->teardown_skb = NULL;
4126 ifmgd->orig_teardown_skb = NULL;
4127 }
4128
4129 /* scan finished notification */
4130 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
4131 {
4132 struct ieee80211_sub_if_data *sdata;
4133
4134 /* Restart STA timers */
4135 rcu_read_lock();
4136 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4137 if (ieee80211_sdata_running(sdata))
4138 ieee80211_restart_sta_timer(sdata);
4139 }
4140 rcu_read_unlock();
4141 }
4142
4143 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
4144 struct cfg80211_bss *cbss)
4145 {
4146 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4147 const u8 *ht_cap_ie, *vht_cap_ie;
4148 const struct ieee80211_ht_cap *ht_cap;
4149 const struct ieee80211_vht_cap *vht_cap;
4150 u8 chains = 1;
4151
4152 if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
4153 return chains;
4154
4155 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4156 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
4157 ht_cap = (void *)(ht_cap_ie + 2);
4158 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
4159 /*
4160 * TODO: use "Tx Maximum Number Spatial Streams Supported" and
4161 * "Tx Unequal Modulation Supported" fields.
4162 */
4163 }
4164
4165 if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
4166 return chains;
4167
4168 vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4169 if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
4170 u8 nss;
4171 u16 tx_mcs_map;
4172
4173 vht_cap = (void *)(vht_cap_ie + 2);
4174 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
4175 for (nss = 8; nss > 0; nss--) {
4176 if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
4177 IEEE80211_VHT_MCS_NOT_SUPPORTED)
4178 break;
4179 }
4180 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
4181 chains = max(chains, nss);
4182 }
4183
4184 return chains;
4185 }
4186
4187 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
4188 struct cfg80211_bss *cbss)
4189 {
4190 struct ieee80211_local *local = sdata->local;
4191 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4192 const struct ieee80211_ht_cap *ht_cap = NULL;
4193 const struct ieee80211_ht_operation *ht_oper = NULL;
4194 const struct ieee80211_vht_operation *vht_oper = NULL;
4195 struct ieee80211_supported_band *sband;
4196 struct cfg80211_chan_def chandef;
4197 int ret;
4198 u32 i;
4199 bool have_80mhz;
4200
4201 sband = local->hw.wiphy->bands[cbss->channel->band];
4202
4203 ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
4204 IEEE80211_STA_DISABLE_80P80MHZ |
4205 IEEE80211_STA_DISABLE_160MHZ);
4206
4207 rcu_read_lock();
4208
4209 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
4210 sband->ht_cap.ht_supported) {
4211 const u8 *ht_oper_ie, *ht_cap_ie;
4212
4213 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4214 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
4215 ht_oper = (void *)(ht_oper_ie + 2);
4216
4217 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4218 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
4219 ht_cap = (void *)(ht_cap_ie + 2);
4220
4221 if (!ht_cap) {
4222 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4223 ht_oper = NULL;
4224 }
4225 }
4226
4227 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4228 sband->vht_cap.vht_supported) {
4229 const u8 *vht_oper_ie, *vht_cap;
4230
4231 vht_oper_ie = ieee80211_bss_get_ie(cbss,
4232 WLAN_EID_VHT_OPERATION);
4233 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
4234 vht_oper = (void *)(vht_oper_ie + 2);
4235 if (vht_oper && !ht_oper) {
4236 vht_oper = NULL;
4237 sdata_info(sdata,
4238 "AP advertised VHT without HT, disabling both\n");
4239 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4240 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4241 }
4242
4243 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4244 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
4245 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4246 vht_oper = NULL;
4247 }
4248 }
4249
4250 /* Allow VHT if at least one channel on the sband supports 80 MHz */
4251 have_80mhz = false;
4252 for (i = 0; i < sband->n_channels; i++) {
4253 if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
4254 IEEE80211_CHAN_NO_80MHZ))
4255 continue;
4256
4257 have_80mhz = true;
4258 break;
4259 }
4260
4261 if (!have_80mhz)
4262 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4263
4264 ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
4265 cbss->channel,
4266 ht_cap, ht_oper, vht_oper,
4267 &chandef, false);
4268
4269 sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
4270 local->rx_chains);
4271
4272 rcu_read_unlock();
4273
4274 /* will change later if needed */
4275 sdata->smps_mode = IEEE80211_SMPS_OFF;
4276
4277 mutex_lock(&local->mtx);
4278 /*
4279 * If this fails (possibly due to channel context sharing
4280 * on incompatible channels, e.g. 80+80 and 160 sharing the
4281 * same control channel) try to use a smaller bandwidth.
4282 */
4283 ret = ieee80211_vif_use_channel(sdata, &chandef,
4284 IEEE80211_CHANCTX_SHARED);
4285
4286 /* don't downgrade for 5 and 10 MHz channels, though. */
4287 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
4288 chandef.width == NL80211_CHAN_WIDTH_10)
4289 goto out;
4290
4291 while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4292 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4293 ret = ieee80211_vif_use_channel(sdata, &chandef,
4294 IEEE80211_CHANCTX_SHARED);
4295 }
4296 out:
4297 mutex_unlock(&local->mtx);
4298 return ret;
4299 }
4300
4301 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4302 struct cfg80211_bss *cbss, bool assoc,
4303 bool override)
4304 {
4305 struct ieee80211_local *local = sdata->local;
4306 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4307 struct ieee80211_bss *bss = (void *)cbss->priv;
4308 struct sta_info *new_sta = NULL;
4309 struct ieee80211_supported_band *sband;
4310 bool have_sta = false;
4311 int err;
4312
4313 sband = local->hw.wiphy->bands[cbss->channel->band];
4314
4315 if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
4316 return -EINVAL;
4317
4318 if (assoc) {
4319 rcu_read_lock();
4320 have_sta = sta_info_get(sdata, cbss->bssid);
4321 rcu_read_unlock();
4322 }
4323
4324 if (!have_sta) {
4325 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
4326 if (!new_sta)
4327 return -ENOMEM;
4328 }
4329
4330 if (new_sta || override) {
4331 err = ieee80211_prep_channel(sdata, cbss);
4332 if (err) {
4333 if (new_sta)
4334 sta_info_free(local, new_sta);
4335 return -EINVAL;
4336 }
4337 }
4338
4339 if (new_sta) {
4340 u32 rates = 0, basic_rates = 0;
4341 bool have_higher_than_11mbit;
4342 int min_rate = INT_MAX, min_rate_index = -1;
4343 struct ieee80211_chanctx_conf *chanctx_conf;
4344 const struct cfg80211_bss_ies *ies;
4345 int shift = ieee80211_vif_get_shift(&sdata->vif);
4346 u32 rate_flags;
4347
4348 rcu_read_lock();
4349 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4350 if (WARN_ON(!chanctx_conf)) {
4351 rcu_read_unlock();
4352 sta_info_free(local, new_sta);
4353 return -EINVAL;
4354 }
4355 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
4356 rcu_read_unlock();
4357
4358 ieee80211_get_rates(sband, bss->supp_rates,
4359 bss->supp_rates_len,
4360 &rates, &basic_rates,
4361 &have_higher_than_11mbit,
4362 &min_rate, &min_rate_index,
4363 shift, rate_flags);
4364
4365 /*
4366 * This used to be a workaround for basic rates missing
4367 * in the association response frame. Now that we no
4368 * longer use the basic rates from there, it probably
4369 * doesn't happen any more, but keep the workaround so
4370 * in case some *other* APs are buggy in different ways
4371 * we can connect -- with a warning.
4372 */
4373 if (!basic_rates && min_rate_index >= 0) {
4374 sdata_info(sdata,
4375 "No basic rates, using min rate instead\n");
4376 basic_rates = BIT(min_rate_index);
4377 }
4378
4379 new_sta->sta.supp_rates[cbss->channel->band] = rates;
4380 sdata->vif.bss_conf.basic_rates = basic_rates;
4381
4382 /* cf. IEEE 802.11 9.2.12 */
4383 if (cbss->channel->band == NL80211_BAND_2GHZ &&
4384 have_higher_than_11mbit)
4385 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
4386 else
4387 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
4388
4389 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
4390
4391 /* set timing information */
4392 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
4393 rcu_read_lock();
4394 ies = rcu_dereference(cbss->beacon_ies);
4395 if (ies) {
4396 const u8 *tim_ie;
4397
4398 sdata->vif.bss_conf.sync_tsf = ies->tsf;
4399 sdata->vif.bss_conf.sync_device_ts =
4400 bss->device_ts_beacon;
4401 tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4402 ies->data, ies->len);
4403 if (tim_ie && tim_ie[1] >= 2)
4404 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
4405 else
4406 sdata->vif.bss_conf.sync_dtim_count = 0;
4407 } else if (!ieee80211_hw_check(&sdata->local->hw,
4408 TIMING_BEACON_ONLY)) {
4409 ies = rcu_dereference(cbss->proberesp_ies);
4410 /* must be non-NULL since beacon IEs were NULL */
4411 sdata->vif.bss_conf.sync_tsf = ies->tsf;
4412 sdata->vif.bss_conf.sync_device_ts =
4413 bss->device_ts_presp;
4414 sdata->vif.bss_conf.sync_dtim_count = 0;
4415 } else {
4416 sdata->vif.bss_conf.sync_tsf = 0;
4417 sdata->vif.bss_conf.sync_device_ts = 0;
4418 sdata->vif.bss_conf.sync_dtim_count = 0;
4419 }
4420 rcu_read_unlock();
4421
4422 /* tell driver about BSSID, basic rates and timing */
4423 ieee80211_bss_info_change_notify(sdata,
4424 BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4425 BSS_CHANGED_BEACON_INT);
4426
4427 if (assoc)
4428 sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4429
4430 err = sta_info_insert(new_sta);
4431 new_sta = NULL;
4432 if (err) {
4433 sdata_info(sdata,
4434 "failed to insert STA entry for the AP (error %d)\n",
4435 err);
4436 return err;
4437 }
4438 } else
4439 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4440
4441 /* Cancel scan to ensure that nothing interferes with connection */
4442 if (local->scanning)
4443 ieee80211_scan_cancel(local);
4444
4445 return 0;
4446 }
4447
4448 /* config hooks */
4449 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4450 struct cfg80211_auth_request *req)
4451 {
4452 struct ieee80211_local *local = sdata->local;
4453 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4454 struct ieee80211_mgd_auth_data *auth_data;
4455 u16 auth_alg;
4456 int err;
4457
4458 /* prepare auth data structure */
4459
4460 switch (req->auth_type) {
4461 case NL80211_AUTHTYPE_OPEN_SYSTEM:
4462 auth_alg = WLAN_AUTH_OPEN;
4463 break;
4464 case NL80211_AUTHTYPE_SHARED_KEY:
4465 if (IS_ERR(local->wep_tx_tfm))
4466 return -EOPNOTSUPP;
4467 auth_alg = WLAN_AUTH_SHARED_KEY;
4468 break;
4469 case NL80211_AUTHTYPE_FT:
4470 auth_alg = WLAN_AUTH_FT;
4471 break;
4472 case NL80211_AUTHTYPE_NETWORK_EAP:
4473 auth_alg = WLAN_AUTH_LEAP;
4474 break;
4475 case NL80211_AUTHTYPE_SAE:
4476 auth_alg = WLAN_AUTH_SAE;
4477 break;
4478 default:
4479 return -EOPNOTSUPP;
4480 }
4481
4482 auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
4483 req->ie_len, GFP_KERNEL);
4484 if (!auth_data)
4485 return -ENOMEM;
4486
4487 auth_data->bss = req->bss;
4488
4489 if (req->sae_data_len >= 4) {
4490 __le16 *pos = (__le16 *) req->sae_data;
4491 auth_data->sae_trans = le16_to_cpu(pos[0]);
4492 auth_data->sae_status = le16_to_cpu(pos[1]);
4493 memcpy(auth_data->data, req->sae_data + 4,
4494 req->sae_data_len - 4);
4495 auth_data->data_len += req->sae_data_len - 4;
4496 }
4497
4498 if (req->ie && req->ie_len) {
4499 memcpy(&auth_data->data[auth_data->data_len],
4500 req->ie, req->ie_len);
4501 auth_data->data_len += req->ie_len;
4502 }
4503
4504 if (req->key && req->key_len) {
4505 auth_data->key_len = req->key_len;
4506 auth_data->key_idx = req->key_idx;
4507 memcpy(auth_data->key, req->key, req->key_len);
4508 }
4509
4510 auth_data->algorithm = auth_alg;
4511
4512 /* try to authenticate/probe */
4513
4514 if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4515 ifmgd->assoc_data) {
4516 err = -EBUSY;
4517 goto err_free;
4518 }
4519
4520 if (ifmgd->auth_data)
4521 ieee80211_destroy_auth_data(sdata, false);
4522
4523 /* prep auth_data so we don't go into idle on disassoc */
4524 ifmgd->auth_data = auth_data;
4525
4526 if (ifmgd->associated) {
4527 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4528
4529 sdata_info(sdata,
4530 "disconnect from AP %pM for new auth to %pM\n",
4531 ifmgd->associated->bssid, req->bss->bssid);
4532 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4533 WLAN_REASON_UNSPECIFIED,
4534 false, frame_buf);
4535
4536 ieee80211_report_disconnect(sdata, frame_buf,
4537 sizeof(frame_buf), true,
4538 WLAN_REASON_UNSPECIFIED);
4539 }
4540
4541 sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4542
4543 err = ieee80211_prep_connection(sdata, req->bss, false, false);
4544 if (err)
4545 goto err_clear;
4546
4547 err = ieee80211_auth(sdata);
4548 if (err) {
4549 sta_info_destroy_addr(sdata, req->bss->bssid);
4550 goto err_clear;
4551 }
4552
4553 /* hold our own reference */
4554 cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4555 return 0;
4556
4557 err_clear:
4558 eth_zero_addr(ifmgd->bssid);
4559 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4560 ifmgd->auth_data = NULL;
4561 mutex_lock(&sdata->local->mtx);
4562 ieee80211_vif_release_channel(sdata);
4563 mutex_unlock(&sdata->local->mtx);
4564 err_free:
4565 kfree(auth_data);
4566 return err;
4567 }
4568
4569 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4570 struct cfg80211_assoc_request *req)
4571 {
4572 struct ieee80211_local *local = sdata->local;
4573 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4574 struct ieee80211_bss *bss = (void *)req->bss->priv;
4575 struct ieee80211_mgd_assoc_data *assoc_data;
4576 const struct cfg80211_bss_ies *beacon_ies;
4577 struct ieee80211_supported_band *sband;
4578 const u8 *ssidie, *ht_ie, *vht_ie;
4579 int i, err;
4580 bool override = false;
4581
4582 assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4583 if (!assoc_data)
4584 return -ENOMEM;
4585
4586 rcu_read_lock();
4587 ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4588 if (!ssidie) {
4589 rcu_read_unlock();
4590 kfree(assoc_data);
4591 return -EINVAL;
4592 }
4593 memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4594 assoc_data->ssid_len = ssidie[1];
4595 rcu_read_unlock();
4596
4597 if (ifmgd->associated) {
4598 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4599
4600 sdata_info(sdata,
4601 "disconnect from AP %pM for new assoc to %pM\n",
4602 ifmgd->associated->bssid, req->bss->bssid);
4603 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4604 WLAN_REASON_UNSPECIFIED,
4605 false, frame_buf);
4606
4607 ieee80211_report_disconnect(sdata, frame_buf,
4608 sizeof(frame_buf), true,
4609 WLAN_REASON_UNSPECIFIED);
4610 }
4611
4612 if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4613 err = -EBUSY;
4614 goto err_free;
4615 }
4616
4617 if (ifmgd->assoc_data) {
4618 err = -EBUSY;
4619 goto err_free;
4620 }
4621
4622 if (ifmgd->auth_data) {
4623 bool match;
4624
4625 /* keep sta info, bssid if matching */
4626 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4627 ieee80211_destroy_auth_data(sdata, match);
4628 }
4629
4630 /* prepare assoc data */
4631
4632 ifmgd->beacon_crc_valid = false;
4633
4634 assoc_data->wmm = bss->wmm_used &&
4635 (local->hw.queues >= IEEE80211_NUM_ACS);
4636
4637 /*
4638 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4639 * We still associate in non-HT mode (11a/b/g) if any one of these
4640 * ciphers is configured as pairwise.
4641 * We can set this to true for non-11n hardware, that'll be checked
4642 * separately along with the peer capabilities.
4643 */
4644 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4645 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4646 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4647 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4648 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4649 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4650 netdev_info(sdata->dev,
4651 "disabling HT/VHT due to WEP/TKIP use\n");
4652 }
4653 }
4654
4655 /* Also disable HT if we don't support it or the AP doesn't use WMM */
4656 sband = local->hw.wiphy->bands[req->bss->channel->band];
4657 if (!sband->ht_cap.ht_supported ||
4658 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4659 ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4660 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4661 if (!bss->wmm_used &&
4662 !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4663 netdev_info(sdata->dev,
4664 "disabling HT as WMM/QoS is not supported by the AP\n");
4665 }
4666
4667 /* disable VHT if we don't support it or the AP doesn't use WMM */
4668 if (!sband->vht_cap.vht_supported ||
4669 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4670 ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4671 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4672 if (!bss->wmm_used &&
4673 !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4674 netdev_info(sdata->dev,
4675 "disabling VHT as WMM/QoS is not supported by the AP\n");
4676 }
4677
4678 memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4679 memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4680 sizeof(ifmgd->ht_capa_mask));
4681
4682 memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4683 memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4684 sizeof(ifmgd->vht_capa_mask));
4685
4686 if (req->ie && req->ie_len) {
4687 memcpy(assoc_data->ie, req->ie, req->ie_len);
4688 assoc_data->ie_len = req->ie_len;
4689 }
4690
4691 assoc_data->bss = req->bss;
4692
4693 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4694 if (ifmgd->powersave)
4695 sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4696 else
4697 sdata->smps_mode = IEEE80211_SMPS_OFF;
4698 } else
4699 sdata->smps_mode = ifmgd->req_smps;
4700
4701 assoc_data->capability = req->bss->capability;
4702 assoc_data->supp_rates = bss->supp_rates;
4703 assoc_data->supp_rates_len = bss->supp_rates_len;
4704
4705 rcu_read_lock();
4706 ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4707 if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4708 assoc_data->ap_ht_param =
4709 ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4710 else
4711 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4712 vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4713 if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4714 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4715 sizeof(struct ieee80211_vht_cap));
4716 else
4717 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4718 rcu_read_unlock();
4719
4720 if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) &&
4721 ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK),
4722 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"))
4723 sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;
4724
4725 if (bss->wmm_used && bss->uapsd_supported &&
4726 (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) {
4727 assoc_data->uapsd = true;
4728 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4729 } else {
4730 assoc_data->uapsd = false;
4731 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4732 }
4733
4734 if (req->prev_bssid)
4735 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4736
4737 if (req->use_mfp) {
4738 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4739 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4740 } else {
4741 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4742 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4743 }
4744
4745 if (req->flags & ASSOC_REQ_USE_RRM)
4746 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
4747 else
4748 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;
4749
4750 if (req->crypto.control_port)
4751 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4752 else
4753 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4754
4755 sdata->control_port_protocol = req->crypto.control_port_ethertype;
4756 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4757 sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4758 sdata->vif.type);
4759
4760 /* kick off associate process */
4761
4762 ifmgd->assoc_data = assoc_data;
4763 ifmgd->dtim_period = 0;
4764 ifmgd->have_beacon = false;
4765
4766 /* override HT/VHT configuration only if the AP and we support it */
4767 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
4768 struct ieee80211_sta_ht_cap sta_ht_cap;
4769
4770 if (req->flags & ASSOC_REQ_DISABLE_HT)
4771 override = true;
4772
4773 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
4774 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
4775
4776 /* check for 40 MHz disable override */
4777 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ) &&
4778 sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
4779 !(sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
4780 override = true;
4781
4782 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4783 req->flags & ASSOC_REQ_DISABLE_VHT)
4784 override = true;
4785 }
4786
4787 if (req->flags & ASSOC_REQ_DISABLE_HT) {
4788 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4789 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4790 }
4791
4792 if (req->flags & ASSOC_REQ_DISABLE_VHT)
4793 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4794
4795 err = ieee80211_prep_connection(sdata, req->bss, true, override);
4796 if (err)
4797 goto err_clear;
4798
4799 rcu_read_lock();
4800 beacon_ies = rcu_dereference(req->bss->beacon_ies);
4801
4802 if (ieee80211_hw_check(&sdata->local->hw, NEED_DTIM_BEFORE_ASSOC) &&
4803 !beacon_ies) {
4804 /*
4805 * Wait up to one beacon interval ...
4806 * should this be more if we miss one?
4807 */
4808 sdata_info(sdata, "waiting for beacon from %pM\n",
4809 ifmgd->bssid);
4810 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4811 assoc_data->timeout_started = true;
4812 assoc_data->need_beacon = true;
4813 } else if (beacon_ies) {
4814 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4815 beacon_ies->data,
4816 beacon_ies->len);
4817 u8 dtim_count = 0;
4818
4819 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4820 const struct ieee80211_tim_ie *tim;
4821 tim = (void *)(tim_ie + 2);
4822 ifmgd->dtim_period = tim->dtim_period;
4823 dtim_count = tim->dtim_count;
4824 }
4825 ifmgd->have_beacon = true;
4826 assoc_data->timeout = jiffies;
4827 assoc_data->timeout_started = true;
4828
4829 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
4830 sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4831 sdata->vif.bss_conf.sync_device_ts =
4832 bss->device_ts_beacon;
4833 sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4834 }
4835 } else {
4836 assoc_data->timeout = jiffies;
4837 assoc_data->timeout_started = true;
4838 }
4839 rcu_read_unlock();
4840
4841 run_again(sdata, assoc_data->timeout);
4842
4843 if (bss->corrupt_data) {
4844 char *corrupt_type = "data";
4845 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4846 if (bss->corrupt_data &
4847 IEEE80211_BSS_CORRUPT_PROBE_RESP)
4848 corrupt_type = "beacon and probe response";
4849 else
4850 corrupt_type = "beacon";
4851 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4852 corrupt_type = "probe response";
4853 sdata_info(sdata, "associating with AP with corrupt %s\n",
4854 corrupt_type);
4855 }
4856
4857 return 0;
4858 err_clear:
4859 eth_zero_addr(ifmgd->bssid);
4860 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4861 ifmgd->assoc_data = NULL;
4862 err_free:
4863 kfree(assoc_data);
4864 return err;
4865 }
4866
4867 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4868 struct cfg80211_deauth_request *req)
4869 {
4870 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4871 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4872 bool tx = !req->local_state_change;
4873
4874 if (ifmgd->auth_data &&
4875 ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
4876 sdata_info(sdata,
4877 "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
4878 req->bssid, req->reason_code,
4879 ieee80211_get_reason_code_string(req->reason_code));
4880
4881 drv_mgd_prepare_tx(sdata->local, sdata);
4882 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4883 IEEE80211_STYPE_DEAUTH,
4884 req->reason_code, tx,
4885 frame_buf);
4886 ieee80211_destroy_auth_data(sdata, false);
4887 ieee80211_report_disconnect(sdata, frame_buf,
4888 sizeof(frame_buf), true,
4889 req->reason_code);
4890
4891 return 0;
4892 }
4893
4894 if (ifmgd->assoc_data &&
4895 ether_addr_equal(ifmgd->assoc_data->bss->bssid, req->bssid)) {
4896 sdata_info(sdata,
4897 "aborting association with %pM by local choice (Reason: %u=%s)\n",
4898 req->bssid, req->reason_code,
4899 ieee80211_get_reason_code_string(req->reason_code));
4900
4901 drv_mgd_prepare_tx(sdata->local, sdata);
4902 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4903 IEEE80211_STYPE_DEAUTH,
4904 req->reason_code, tx,
4905 frame_buf);
4906 ieee80211_destroy_assoc_data(sdata, false);
4907 ieee80211_report_disconnect(sdata, frame_buf,
4908 sizeof(frame_buf), true,
4909 req->reason_code);
4910 return 0;
4911 }
4912
4913 if (ifmgd->associated &&
4914 ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4915 sdata_info(sdata,
4916 "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
4917 req->bssid, req->reason_code,
4918 ieee80211_get_reason_code_string(req->reason_code));
4919
4920 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4921 req->reason_code, tx, frame_buf);
4922 ieee80211_report_disconnect(sdata, frame_buf,
4923 sizeof(frame_buf), true,
4924 req->reason_code);
4925 return 0;
4926 }
4927
4928 return -ENOTCONN;
4929 }
4930
4931 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4932 struct cfg80211_disassoc_request *req)
4933 {
4934 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4935 u8 bssid[ETH_ALEN];
4936 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4937
4938 /*
4939 * cfg80211 should catch this ... but it's racy since
4940 * we can receive a disassoc frame, process it, hand it
4941 * to cfg80211 while that's in a locked section already
4942 * trying to tell us that the user wants to disconnect.
4943 */
4944 if (ifmgd->associated != req->bss)
4945 return -ENOLINK;
4946
4947 sdata_info(sdata,
4948 "disassociating from %pM by local choice (Reason: %u=%s)\n",
4949 req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
4950
4951 memcpy(bssid, req->bss->bssid, ETH_ALEN);
4952 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
4953 req->reason_code, !req->local_state_change,
4954 frame_buf);
4955
4956 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
4957 req->reason_code);
4958
4959 return 0;
4960 }
4961
4962 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4963 {
4964 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4965
4966 /*
4967 * Make sure some work items will not run after this,
4968 * they will not do anything but might not have been
4969 * cancelled when disconnecting.
4970 */
4971 cancel_work_sync(&ifmgd->monitor_work);
4972 cancel_work_sync(&ifmgd->beacon_connection_loss_work);
4973 cancel_work_sync(&ifmgd->request_smps_work);
4974 cancel_work_sync(&ifmgd->csa_connection_drop_work);
4975 cancel_work_sync(&ifmgd->chswitch_work);
4976 cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
4977
4978 sdata_lock(sdata);
4979 if (ifmgd->assoc_data) {
4980 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
4981 ieee80211_destroy_assoc_data(sdata, false);
4982 cfg80211_assoc_timeout(sdata->dev, bss);
4983 }
4984 if (ifmgd->auth_data)
4985 ieee80211_destroy_auth_data(sdata, false);
4986 spin_lock_bh(&ifmgd->teardown_lock);
4987 if (ifmgd->teardown_skb) {
4988 kfree_skb(ifmgd->teardown_skb);
4989 ifmgd->teardown_skb = NULL;
4990 ifmgd->orig_teardown_skb = NULL;
4991 }
4992 spin_unlock_bh(&ifmgd->teardown_lock);
4993 del_timer_sync(&ifmgd->timer);
4994 sdata_unlock(sdata);
4995 }
4996
4997 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
4998 enum nl80211_cqm_rssi_threshold_event rssi_event,
4999 gfp_t gfp)
5000 {
5001 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5002
5003 trace_api_cqm_rssi_notify(sdata, rssi_event);
5004
5005 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
5006 }
5007 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
5008
5009 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp)
5010 {
5011 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5012
5013 trace_api_cqm_beacon_loss_notify(sdata->local, sdata);
5014
5015 cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp);
5016 }
5017 EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify);
Linux kernel - Deliverables
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