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mac80211: always print a message when disconnecting
[deliverable/linux.git] / net / mac80211 / mlme.c
1 /*
2 * BSS client mode implementation
3 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4 * Copyright 2004, Instant802 Networks, Inc.
5 * Copyright 2005, Devicescape Software, Inc.
6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8 * Copyright 2013-2014 Intel Mobile Communications GmbH
9 * Copyright (C) 2015 Intel Deutschland GmbH
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 */
15
16 #include <linux/delay.h>
17 #include <linux/if_ether.h>
18 #include <linux/skbuff.h>
19 #include <linux/if_arp.h>
20 #include <linux/etherdevice.h>
21 #include <linux/moduleparam.h>
22 #include <linux/rtnetlink.h>
23 #include <linux/crc32.h>
24 #include <linux/slab.h>
25 #include <linux/export.h>
26 #include <net/mac80211.h>
27 #include <asm/unaligned.h>
28
29 #include "ieee80211_i.h"
30 #include "driver-ops.h"
31 #include "rate.h"
32 #include "led.h"
33
34 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
35 #define IEEE80211_AUTH_TIMEOUT_LONG (HZ / 2)
36 #define IEEE80211_AUTH_TIMEOUT_SHORT (HZ / 10)
37 #define IEEE80211_AUTH_MAX_TRIES 3
38 #define IEEE80211_AUTH_WAIT_ASSOC (HZ * 5)
39 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
40 #define IEEE80211_ASSOC_TIMEOUT_LONG (HZ / 2)
41 #define IEEE80211_ASSOC_TIMEOUT_SHORT (HZ / 10)
42 #define IEEE80211_ASSOC_MAX_TRIES 3
43
44 static int max_nullfunc_tries = 2;
45 module_param(max_nullfunc_tries, int, 0644);
46 MODULE_PARM_DESC(max_nullfunc_tries,
47 "Maximum nullfunc tx tries before disconnecting (reason 4).");
48
49 static int max_probe_tries = 5;
50 module_param(max_probe_tries, int, 0644);
51 MODULE_PARM_DESC(max_probe_tries,
52 "Maximum probe tries before disconnecting (reason 4).");
53
54 /*
55 * Beacon loss timeout is calculated as N frames times the
56 * advertised beacon interval. This may need to be somewhat
57 * higher than what hardware might detect to account for
58 * delays in the host processing frames. But since we also
59 * probe on beacon miss before declaring the connection lost
60 * default to what we want.
61 */
62 static int beacon_loss_count = 7;
63 module_param(beacon_loss_count, int, 0644);
64 MODULE_PARM_DESC(beacon_loss_count,
65 "Number of beacon intervals before we decide beacon was lost.");
66
67 /*
68 * Time the connection can be idle before we probe
69 * it to see if we can still talk to the AP.
70 */
71 #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ)
72 /*
73 * Time we wait for a probe response after sending
74 * a probe request because of beacon loss or for
75 * checking the connection still works.
76 */
77 static int probe_wait_ms = 500;
78 module_param(probe_wait_ms, int, 0644);
79 MODULE_PARM_DESC(probe_wait_ms,
80 "Maximum time(ms) to wait for probe response"
81 " before disconnecting (reason 4).");
82
83 /*
84 * How many Beacon frames need to have been used in average signal strength
85 * before starting to indicate signal change events.
86 */
87 #define IEEE80211_SIGNAL_AVE_MIN_COUNT 4
88
89 /*
90 * We can have multiple work items (and connection probing)
91 * scheduling this timer, but we need to take care to only
92 * reschedule it when it should fire _earlier_ than it was
93 * asked for before, or if it's not pending right now. This
94 * function ensures that. Note that it then is required to
95 * run this function for all timeouts after the first one
96 * has happened -- the work that runs from this timer will
97 * do that.
98 */
99 static void run_again(struct ieee80211_sub_if_data *sdata,
100 unsigned long timeout)
101 {
102 sdata_assert_lock(sdata);
103
104 if (!timer_pending(&sdata->u.mgd.timer) ||
105 time_before(timeout, sdata->u.mgd.timer.expires))
106 mod_timer(&sdata->u.mgd.timer, timeout);
107 }
108
109 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
110 {
111 if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
112 return;
113
114 if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
115 return;
116
117 mod_timer(&sdata->u.mgd.bcn_mon_timer,
118 round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
119 }
120
121 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
122 {
123 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
124
125 if (unlikely(!sdata->u.mgd.associated))
126 return;
127
128 ifmgd->probe_send_count = 0;
129
130 if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
131 return;
132
133 mod_timer(&sdata->u.mgd.conn_mon_timer,
134 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
135 }
136
137 static int ecw2cw(int ecw)
138 {
139 return (1 << ecw) - 1;
140 }
141
142 static u32
143 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
144 struct ieee80211_supported_band *sband,
145 struct ieee80211_channel *channel,
146 const struct ieee80211_ht_cap *ht_cap,
147 const struct ieee80211_ht_operation *ht_oper,
148 const struct ieee80211_vht_operation *vht_oper,
149 struct cfg80211_chan_def *chandef, bool tracking)
150 {
151 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
152 struct cfg80211_chan_def vht_chandef;
153 struct ieee80211_sta_ht_cap sta_ht_cap;
154 u32 ht_cfreq, ret;
155
156 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
157 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
158
159 chandef->chan = channel;
160 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
161 chandef->center_freq1 = channel->center_freq;
162 chandef->center_freq2 = 0;
163
164 if (!ht_cap || !ht_oper || !sta_ht_cap.ht_supported) {
165 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
166 goto out;
167 }
168
169 chandef->width = NL80211_CHAN_WIDTH_20;
170
171 if (!(ht_cap->cap_info &
172 cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40))) {
173 ret = IEEE80211_STA_DISABLE_40MHZ;
174 vht_chandef = *chandef;
175 goto out;
176 }
177
178 ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
179 channel->band);
180 /* check that channel matches the right operating channel */
181 if (!tracking && channel->center_freq != ht_cfreq) {
182 /*
183 * It's possible that some APs are confused here;
184 * Netgear WNDR3700 sometimes reports 4 higher than
185 * the actual channel in association responses, but
186 * since we look at probe response/beacon data here
187 * it should be OK.
188 */
189 sdata_info(sdata,
190 "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
191 channel->center_freq, ht_cfreq,
192 ht_oper->primary_chan, channel->band);
193 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
194 goto out;
195 }
196
197 /* check 40 MHz support, if we have it */
198 if (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
199 ieee80211_chandef_ht_oper(ht_oper, chandef);
200 } else {
201 /* 40 MHz (and 80 MHz) must be supported for VHT */
202 ret = IEEE80211_STA_DISABLE_VHT;
203 /* also mark 40 MHz disabled */
204 ret |= IEEE80211_STA_DISABLE_40MHZ;
205 goto out;
206 }
207
208 if (!vht_oper || !sband->vht_cap.vht_supported) {
209 ret = IEEE80211_STA_DISABLE_VHT;
210 goto out;
211 }
212
213 vht_chandef = *chandef;
214 if (!ieee80211_chandef_vht_oper(vht_oper, &vht_chandef)) {
215 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
216 sdata_info(sdata,
217 "AP VHT information is invalid, disable VHT\n");
218 ret = IEEE80211_STA_DISABLE_VHT;
219 goto out;
220 }
221
222 if (!cfg80211_chandef_valid(&vht_chandef)) {
223 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
224 sdata_info(sdata,
225 "AP VHT information is invalid, disable VHT\n");
226 ret = IEEE80211_STA_DISABLE_VHT;
227 goto out;
228 }
229
230 if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
231 ret = 0;
232 goto out;
233 }
234
235 if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
236 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
237 sdata_info(sdata,
238 "AP VHT information doesn't match HT, disable VHT\n");
239 ret = IEEE80211_STA_DISABLE_VHT;
240 goto out;
241 }
242
243 *chandef = vht_chandef;
244
245 ret = 0;
246
247 out:
248 /*
249 * When tracking the current AP, don't do any further checks if the
250 * new chandef is identical to the one we're currently using for the
251 * connection. This keeps us from playing ping-pong with regulatory,
252 * without it the following can happen (for example):
253 * - connect to an AP with 80 MHz, world regdom allows 80 MHz
254 * - AP advertises regdom US
255 * - CRDA loads regdom US with 80 MHz prohibited (old database)
256 * - the code below detects an unsupported channel, downgrades, and
257 * we disconnect from the AP in the caller
258 * - disconnect causes CRDA to reload world regdomain and the game
259 * starts anew.
260 * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
261 *
262 * It seems possible that there are still scenarios with CSA or real
263 * bandwidth changes where a this could happen, but those cases are
264 * less common and wouldn't completely prevent using the AP.
265 */
266 if (tracking &&
267 cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
268 return ret;
269
270 /* don't print the message below for VHT mismatch if VHT is disabled */
271 if (ret & IEEE80211_STA_DISABLE_VHT)
272 vht_chandef = *chandef;
273
274 /*
275 * Ignore the DISABLED flag when we're already connected and only
276 * tracking the APs beacon for bandwidth changes - otherwise we
277 * might get disconnected here if we connect to an AP, update our
278 * regulatory information based on the AP's country IE and the
279 * information we have is wrong/outdated and disables the channel
280 * that we're actually using for the connection to the AP.
281 */
282 while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
283 tracking ? 0 :
284 IEEE80211_CHAN_DISABLED)) {
285 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
286 ret = IEEE80211_STA_DISABLE_HT |
287 IEEE80211_STA_DISABLE_VHT;
288 break;
289 }
290
291 ret |= ieee80211_chandef_downgrade(chandef);
292 }
293
294 if (chandef->width != vht_chandef.width && !tracking)
295 sdata_info(sdata,
296 "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
297
298 WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
299 return ret;
300 }
301
302 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
303 struct sta_info *sta,
304 const struct ieee80211_ht_cap *ht_cap,
305 const struct ieee80211_ht_operation *ht_oper,
306 const struct ieee80211_vht_operation *vht_oper,
307 const u8 *bssid, u32 *changed)
308 {
309 struct ieee80211_local *local = sdata->local;
310 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
311 struct ieee80211_supported_band *sband;
312 struct ieee80211_channel *chan;
313 struct cfg80211_chan_def chandef;
314 u16 ht_opmode;
315 u32 flags;
316 enum ieee80211_sta_rx_bandwidth new_sta_bw;
317 int ret;
318
319 /* if HT was/is disabled, don't track any bandwidth changes */
320 if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
321 return 0;
322
323 /* don't check VHT if we associated as non-VHT station */
324 if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
325 vht_oper = NULL;
326
327 if (WARN_ON_ONCE(!sta))
328 return -EINVAL;
329
330 /*
331 * if bss configuration changed store the new one -
332 * this may be applicable even if channel is identical
333 */
334 ht_opmode = le16_to_cpu(ht_oper->operation_mode);
335 if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
336 *changed |= BSS_CHANGED_HT;
337 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
338 }
339
340 chan = sdata->vif.bss_conf.chandef.chan;
341 sband = local->hw.wiphy->bands[chan->band];
342
343 /* calculate new channel (type) based on HT/VHT operation IEs */
344 flags = ieee80211_determine_chantype(sdata, sband, chan,
345 ht_cap, ht_oper, vht_oper,
346 &chandef, true);
347
348 /*
349 * Downgrade the new channel if we associated with restricted
350 * capabilities. For example, if we associated as a 20 MHz STA
351 * to a 40 MHz AP (due to regulatory, capabilities or config
352 * reasons) then switching to a 40 MHz channel now won't do us
353 * any good -- we couldn't use it with the AP.
354 */
355 if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
356 chandef.width == NL80211_CHAN_WIDTH_80P80)
357 flags |= ieee80211_chandef_downgrade(&chandef);
358 if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
359 chandef.width == NL80211_CHAN_WIDTH_160)
360 flags |= ieee80211_chandef_downgrade(&chandef);
361 if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
362 chandef.width > NL80211_CHAN_WIDTH_20)
363 flags |= ieee80211_chandef_downgrade(&chandef);
364
365 if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
366 return 0;
367
368 sdata_info(sdata,
369 "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
370 ifmgd->bssid, chandef.chan->center_freq, chandef.width,
371 chandef.center_freq1, chandef.center_freq2);
372
373 if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
374 IEEE80211_STA_DISABLE_VHT |
375 IEEE80211_STA_DISABLE_40MHZ |
376 IEEE80211_STA_DISABLE_80P80MHZ |
377 IEEE80211_STA_DISABLE_160MHZ)) ||
378 !cfg80211_chandef_valid(&chandef)) {
379 sdata_info(sdata,
380 "AP %pM changed bandwidth in a way we can't support - disconnect\n",
381 ifmgd->bssid);
382 return -EINVAL;
383 }
384
385 switch (chandef.width) {
386 case NL80211_CHAN_WIDTH_20_NOHT:
387 case NL80211_CHAN_WIDTH_20:
388 new_sta_bw = IEEE80211_STA_RX_BW_20;
389 break;
390 case NL80211_CHAN_WIDTH_40:
391 new_sta_bw = IEEE80211_STA_RX_BW_40;
392 break;
393 case NL80211_CHAN_WIDTH_80:
394 new_sta_bw = IEEE80211_STA_RX_BW_80;
395 break;
396 case NL80211_CHAN_WIDTH_80P80:
397 case NL80211_CHAN_WIDTH_160:
398 new_sta_bw = IEEE80211_STA_RX_BW_160;
399 break;
400 default:
401 return -EINVAL;
402 }
403
404 if (new_sta_bw > sta->cur_max_bandwidth)
405 new_sta_bw = sta->cur_max_bandwidth;
406
407 if (new_sta_bw < sta->sta.bandwidth) {
408 sta->sta.bandwidth = new_sta_bw;
409 rate_control_rate_update(local, sband, sta,
410 IEEE80211_RC_BW_CHANGED);
411 }
412
413 ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
414 if (ret) {
415 sdata_info(sdata,
416 "AP %pM changed bandwidth to incompatible one - disconnect\n",
417 ifmgd->bssid);
418 return ret;
419 }
420
421 if (new_sta_bw > sta->sta.bandwidth) {
422 sta->sta.bandwidth = new_sta_bw;
423 rate_control_rate_update(local, sband, sta,
424 IEEE80211_RC_BW_CHANGED);
425 }
426
427 return 0;
428 }
429
430 /* frame sending functions */
431
432 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
433 struct sk_buff *skb, u8 ap_ht_param,
434 struct ieee80211_supported_band *sband,
435 struct ieee80211_channel *channel,
436 enum ieee80211_smps_mode smps)
437 {
438 u8 *pos;
439 u32 flags = channel->flags;
440 u16 cap;
441 struct ieee80211_sta_ht_cap ht_cap;
442
443 BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
444
445 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
446 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
447
448 /* determine capability flags */
449 cap = ht_cap.cap;
450
451 switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
452 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
453 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
454 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
455 cap &= ~IEEE80211_HT_CAP_SGI_40;
456 }
457 break;
458 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
459 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
460 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
461 cap &= ~IEEE80211_HT_CAP_SGI_40;
462 }
463 break;
464 }
465
466 /*
467 * If 40 MHz was disabled associate as though we weren't
468 * capable of 40 MHz -- some broken APs will never fall
469 * back to trying to transmit in 20 MHz.
470 */
471 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
472 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
473 cap &= ~IEEE80211_HT_CAP_SGI_40;
474 }
475
476 /* set SM PS mode properly */
477 cap &= ~IEEE80211_HT_CAP_SM_PS;
478 switch (smps) {
479 case IEEE80211_SMPS_AUTOMATIC:
480 case IEEE80211_SMPS_NUM_MODES:
481 WARN_ON(1);
482 case IEEE80211_SMPS_OFF:
483 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
484 IEEE80211_HT_CAP_SM_PS_SHIFT;
485 break;
486 case IEEE80211_SMPS_STATIC:
487 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
488 IEEE80211_HT_CAP_SM_PS_SHIFT;
489 break;
490 case IEEE80211_SMPS_DYNAMIC:
491 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
492 IEEE80211_HT_CAP_SM_PS_SHIFT;
493 break;
494 }
495
496 /* reserve and fill IE */
497 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
498 ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
499 }
500
501 /* This function determines vht capability flags for the association
502 * and builds the IE.
503 * Note - the function may set the owner of the MU-MIMO capability
504 */
505 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
506 struct sk_buff *skb,
507 struct ieee80211_supported_band *sband,
508 struct ieee80211_vht_cap *ap_vht_cap)
509 {
510 struct ieee80211_local *local = sdata->local;
511 u8 *pos;
512 u32 cap;
513 struct ieee80211_sta_vht_cap vht_cap;
514 u32 mask, ap_bf_sts, our_bf_sts;
515
516 BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
517
518 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
519 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
520
521 /* determine capability flags */
522 cap = vht_cap.cap;
523
524 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
525 u32 bw = cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
526
527 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
528 if (bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ ||
529 bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
530 cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
531 }
532
533 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
534 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
535 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
536 }
537
538 /*
539 * Some APs apparently get confused if our capabilities are better
540 * than theirs, so restrict what we advertise in the assoc request.
541 */
542 if (!(ap_vht_cap->vht_cap_info &
543 cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
544 cap &= ~(IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
545 IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE);
546 else if (!(ap_vht_cap->vht_cap_info &
547 cpu_to_le32(IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE)))
548 cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
549
550 /*
551 * If some other vif is using the MU-MIMO capablity we cannot associate
552 * using MU-MIMO - this will lead to contradictions in the group-id
553 * mechanism.
554 * Ownership is defined since association request, in order to avoid
555 * simultaneous associations with MU-MIMO.
556 */
557 if (cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE) {
558 bool disable_mu_mimo = false;
559 struct ieee80211_sub_if_data *other;
560
561 list_for_each_entry_rcu(other, &local->interfaces, list) {
562 if (other->flags & IEEE80211_SDATA_MU_MIMO_OWNER) {
563 disable_mu_mimo = true;
564 break;
565 }
566 }
567 if (disable_mu_mimo)
568 cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
569 else
570 sdata->flags |= IEEE80211_SDATA_MU_MIMO_OWNER;
571 }
572
573 mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
574
575 ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask;
576 our_bf_sts = cap & mask;
577
578 if (ap_bf_sts < our_bf_sts) {
579 cap &= ~mask;
580 cap |= ap_bf_sts;
581 }
582
583 /* reserve and fill IE */
584 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
585 ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
586 }
587
588 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
589 {
590 struct ieee80211_local *local = sdata->local;
591 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
592 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
593 struct sk_buff *skb;
594 struct ieee80211_mgmt *mgmt;
595 u8 *pos, qos_info;
596 size_t offset = 0, noffset;
597 int i, count, rates_len, supp_rates_len, shift;
598 u16 capab;
599 struct ieee80211_supported_band *sband;
600 struct ieee80211_chanctx_conf *chanctx_conf;
601 struct ieee80211_channel *chan;
602 u32 rate_flags, rates = 0;
603
604 sdata_assert_lock(sdata);
605
606 rcu_read_lock();
607 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
608 if (WARN_ON(!chanctx_conf)) {
609 rcu_read_unlock();
610 return;
611 }
612 chan = chanctx_conf->def.chan;
613 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
614 rcu_read_unlock();
615 sband = local->hw.wiphy->bands[chan->band];
616 shift = ieee80211_vif_get_shift(&sdata->vif);
617
618 if (assoc_data->supp_rates_len) {
619 /*
620 * Get all rates supported by the device and the AP as
621 * some APs don't like getting a superset of their rates
622 * in the association request (e.g. D-Link DAP 1353 in
623 * b-only mode)...
624 */
625 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
626 assoc_data->supp_rates,
627 assoc_data->supp_rates_len,
628 &rates);
629 } else {
630 /*
631 * In case AP not provide any supported rates information
632 * before association, we send information element(s) with
633 * all rates that we support.
634 */
635 rates_len = 0;
636 for (i = 0; i < sband->n_bitrates; i++) {
637 if ((rate_flags & sband->bitrates[i].flags)
638 != rate_flags)
639 continue;
640 rates |= BIT(i);
641 rates_len++;
642 }
643 }
644
645 skb = alloc_skb(local->hw.extra_tx_headroom +
646 sizeof(*mgmt) + /* bit too much but doesn't matter */
647 2 + assoc_data->ssid_len + /* SSID */
648 4 + rates_len + /* (extended) rates */
649 4 + /* power capability */
650 2 + 2 * sband->n_channels + /* supported channels */
651 2 + sizeof(struct ieee80211_ht_cap) + /* HT */
652 2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
653 assoc_data->ie_len + /* extra IEs */
654 9, /* WMM */
655 GFP_KERNEL);
656 if (!skb)
657 return;
658
659 skb_reserve(skb, local->hw.extra_tx_headroom);
660
661 capab = WLAN_CAPABILITY_ESS;
662
663 if (sband->band == IEEE80211_BAND_2GHZ) {
664 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
665 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
666 }
667
668 if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
669 capab |= WLAN_CAPABILITY_PRIVACY;
670
671 if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
672 ieee80211_hw_check(&local->hw, SPECTRUM_MGMT))
673 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
674
675 if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM)
676 capab |= WLAN_CAPABILITY_RADIO_MEASURE;
677
678 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
679 memset(mgmt, 0, 24);
680 memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
681 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
682 memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
683
684 if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
685 skb_put(skb, 10);
686 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
687 IEEE80211_STYPE_REASSOC_REQ);
688 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
689 mgmt->u.reassoc_req.listen_interval =
690 cpu_to_le16(local->hw.conf.listen_interval);
691 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
692 ETH_ALEN);
693 } else {
694 skb_put(skb, 4);
695 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
696 IEEE80211_STYPE_ASSOC_REQ);
697 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
698 mgmt->u.assoc_req.listen_interval =
699 cpu_to_le16(local->hw.conf.listen_interval);
700 }
701
702 /* SSID */
703 pos = skb_put(skb, 2 + assoc_data->ssid_len);
704 *pos++ = WLAN_EID_SSID;
705 *pos++ = assoc_data->ssid_len;
706 memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
707
708 /* add all rates which were marked to be used above */
709 supp_rates_len = rates_len;
710 if (supp_rates_len > 8)
711 supp_rates_len = 8;
712
713 pos = skb_put(skb, supp_rates_len + 2);
714 *pos++ = WLAN_EID_SUPP_RATES;
715 *pos++ = supp_rates_len;
716
717 count = 0;
718 for (i = 0; i < sband->n_bitrates; i++) {
719 if (BIT(i) & rates) {
720 int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
721 5 * (1 << shift));
722 *pos++ = (u8) rate;
723 if (++count == 8)
724 break;
725 }
726 }
727
728 if (rates_len > count) {
729 pos = skb_put(skb, rates_len - count + 2);
730 *pos++ = WLAN_EID_EXT_SUPP_RATES;
731 *pos++ = rates_len - count;
732
733 for (i++; i < sband->n_bitrates; i++) {
734 if (BIT(i) & rates) {
735 int rate;
736 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
737 5 * (1 << shift));
738 *pos++ = (u8) rate;
739 }
740 }
741 }
742
743 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT ||
744 capab & WLAN_CAPABILITY_RADIO_MEASURE) {
745 pos = skb_put(skb, 4);
746 *pos++ = WLAN_EID_PWR_CAPABILITY;
747 *pos++ = 2;
748 *pos++ = 0; /* min tx power */
749 /* max tx power */
750 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
751 }
752
753 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
754 /* TODO: get this in reg domain format */
755 pos = skb_put(skb, 2 * sband->n_channels + 2);
756 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
757 *pos++ = 2 * sband->n_channels;
758 for (i = 0; i < sband->n_channels; i++) {
759 *pos++ = ieee80211_frequency_to_channel(
760 sband->channels[i].center_freq);
761 *pos++ = 1; /* one channel in the subband*/
762 }
763 }
764
765 /* if present, add any custom IEs that go before HT */
766 if (assoc_data->ie_len) {
767 static const u8 before_ht[] = {
768 WLAN_EID_SSID,
769 WLAN_EID_SUPP_RATES,
770 WLAN_EID_EXT_SUPP_RATES,
771 WLAN_EID_PWR_CAPABILITY,
772 WLAN_EID_SUPPORTED_CHANNELS,
773 WLAN_EID_RSN,
774 WLAN_EID_QOS_CAPA,
775 WLAN_EID_RRM_ENABLED_CAPABILITIES,
776 WLAN_EID_MOBILITY_DOMAIN,
777 WLAN_EID_FAST_BSS_TRANSITION, /* reassoc only */
778 WLAN_EID_RIC_DATA, /* reassoc only */
779 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
780 };
781 static const u8 after_ric[] = {
782 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
783 WLAN_EID_HT_CAPABILITY,
784 WLAN_EID_BSS_COEX_2040,
785 WLAN_EID_EXT_CAPABILITY,
786 WLAN_EID_QOS_TRAFFIC_CAPA,
787 WLAN_EID_TIM_BCAST_REQ,
788 WLAN_EID_INTERWORKING,
789 /* 60GHz doesn't happen right now */
790 WLAN_EID_VHT_CAPABILITY,
791 WLAN_EID_OPMODE_NOTIF,
792 };
793
794 noffset = ieee80211_ie_split_ric(assoc_data->ie,
795 assoc_data->ie_len,
796 before_ht,
797 ARRAY_SIZE(before_ht),
798 after_ric,
799 ARRAY_SIZE(after_ric),
800 offset);
801 pos = skb_put(skb, noffset - offset);
802 memcpy(pos, assoc_data->ie + offset, noffset - offset);
803 offset = noffset;
804 }
805
806 if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
807 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
808 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
809
810 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
811 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
812 sband, chan, sdata->smps_mode);
813
814 /* if present, add any custom IEs that go before VHT */
815 if (assoc_data->ie_len) {
816 static const u8 before_vht[] = {
817 WLAN_EID_SSID,
818 WLAN_EID_SUPP_RATES,
819 WLAN_EID_EXT_SUPP_RATES,
820 WLAN_EID_PWR_CAPABILITY,
821 WLAN_EID_SUPPORTED_CHANNELS,
822 WLAN_EID_RSN,
823 WLAN_EID_QOS_CAPA,
824 WLAN_EID_RRM_ENABLED_CAPABILITIES,
825 WLAN_EID_MOBILITY_DOMAIN,
826 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
827 WLAN_EID_HT_CAPABILITY,
828 WLAN_EID_BSS_COEX_2040,
829 WLAN_EID_EXT_CAPABILITY,
830 WLAN_EID_QOS_TRAFFIC_CAPA,
831 WLAN_EID_TIM_BCAST_REQ,
832 WLAN_EID_INTERWORKING,
833 };
834
835 /* RIC already taken above, so no need to handle here anymore */
836 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
837 before_vht, ARRAY_SIZE(before_vht),
838 offset);
839 pos = skb_put(skb, noffset - offset);
840 memcpy(pos, assoc_data->ie + offset, noffset - offset);
841 offset = noffset;
842 }
843
844 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
845 ieee80211_add_vht_ie(sdata, skb, sband,
846 &assoc_data->ap_vht_cap);
847
848 /* if present, add any custom non-vendor IEs that go after HT */
849 if (assoc_data->ie_len) {
850 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
851 assoc_data->ie_len,
852 offset);
853 pos = skb_put(skb, noffset - offset);
854 memcpy(pos, assoc_data->ie + offset, noffset - offset);
855 offset = noffset;
856 }
857
858 if (assoc_data->wmm) {
859 if (assoc_data->uapsd) {
860 qos_info = ifmgd->uapsd_queues;
861 qos_info |= (ifmgd->uapsd_max_sp_len <<
862 IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
863 } else {
864 qos_info = 0;
865 }
866
867 pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
868 }
869
870 /* add any remaining custom (i.e. vendor specific here) IEs */
871 if (assoc_data->ie_len) {
872 noffset = assoc_data->ie_len;
873 pos = skb_put(skb, noffset - offset);
874 memcpy(pos, assoc_data->ie + offset, noffset - offset);
875 }
876
877 drv_mgd_prepare_tx(local, sdata);
878
879 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
880 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
881 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
882 IEEE80211_TX_INTFL_MLME_CONN_TX;
883 ieee80211_tx_skb(sdata, skb);
884 }
885
886 void ieee80211_send_pspoll(struct ieee80211_local *local,
887 struct ieee80211_sub_if_data *sdata)
888 {
889 struct ieee80211_pspoll *pspoll;
890 struct sk_buff *skb;
891
892 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
893 if (!skb)
894 return;
895
896 pspoll = (struct ieee80211_pspoll *) skb->data;
897 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
898
899 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
900 ieee80211_tx_skb(sdata, skb);
901 }
902
903 void ieee80211_send_nullfunc(struct ieee80211_local *local,
904 struct ieee80211_sub_if_data *sdata,
905 bool powersave)
906 {
907 struct sk_buff *skb;
908 struct ieee80211_hdr_3addr *nullfunc;
909 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
910
911 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
912 if (!skb)
913 return;
914
915 nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
916 if (powersave)
917 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
918
919 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
920 IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
921
922 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
923 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
924
925 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
926 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
927
928 ieee80211_tx_skb(sdata, skb);
929 }
930
931 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
932 struct ieee80211_sub_if_data *sdata)
933 {
934 struct sk_buff *skb;
935 struct ieee80211_hdr *nullfunc;
936 __le16 fc;
937
938 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
939 return;
940
941 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
942 if (!skb)
943 return;
944
945 skb_reserve(skb, local->hw.extra_tx_headroom);
946
947 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
948 memset(nullfunc, 0, 30);
949 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
950 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
951 nullfunc->frame_control = fc;
952 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
953 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
954 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
955 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
956
957 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
958 ieee80211_tx_skb(sdata, skb);
959 }
960
961 /* spectrum management related things */
962 static void ieee80211_chswitch_work(struct work_struct *work)
963 {
964 struct ieee80211_sub_if_data *sdata =
965 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
966 struct ieee80211_local *local = sdata->local;
967 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
968 int ret;
969
970 if (!ieee80211_sdata_running(sdata))
971 return;
972
973 sdata_lock(sdata);
974 mutex_lock(&local->mtx);
975 mutex_lock(&local->chanctx_mtx);
976
977 if (!ifmgd->associated)
978 goto out;
979
980 if (!sdata->vif.csa_active)
981 goto out;
982
983 /*
984 * using reservation isn't immediate as it may be deferred until later
985 * with multi-vif. once reservation is complete it will re-schedule the
986 * work with no reserved_chanctx so verify chandef to check if it
987 * completed successfully
988 */
989
990 if (sdata->reserved_chanctx) {
991 /*
992 * with multi-vif csa driver may call ieee80211_csa_finish()
993 * many times while waiting for other interfaces to use their
994 * reservations
995 */
996 if (sdata->reserved_ready)
997 goto out;
998
999 ret = ieee80211_vif_use_reserved_context(sdata);
1000 if (ret) {
1001 sdata_info(sdata,
1002 "failed to use reserved channel context, disconnecting (err=%d)\n",
1003 ret);
1004 ieee80211_queue_work(&sdata->local->hw,
1005 &ifmgd->csa_connection_drop_work);
1006 goto out;
1007 }
1008
1009 goto out;
1010 }
1011
1012 if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
1013 &sdata->csa_chandef)) {
1014 sdata_info(sdata,
1015 "failed to finalize channel switch, disconnecting\n");
1016 ieee80211_queue_work(&sdata->local->hw,
1017 &ifmgd->csa_connection_drop_work);
1018 goto out;
1019 }
1020
1021 /* XXX: shouldn't really modify cfg80211-owned data! */
1022 ifmgd->associated->channel = sdata->csa_chandef.chan;
1023
1024 ifmgd->csa_waiting_bcn = true;
1025
1026 ieee80211_sta_reset_beacon_monitor(sdata);
1027 ieee80211_sta_reset_conn_monitor(sdata);
1028
1029 out:
1030 mutex_unlock(&local->chanctx_mtx);
1031 mutex_unlock(&local->mtx);
1032 sdata_unlock(sdata);
1033 }
1034
1035 static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata)
1036 {
1037 struct ieee80211_local *local = sdata->local;
1038 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1039 int ret;
1040
1041 sdata_assert_lock(sdata);
1042
1043 WARN_ON(!sdata->vif.csa_active);
1044
1045 if (sdata->csa_block_tx) {
1046 ieee80211_wake_vif_queues(local, sdata,
1047 IEEE80211_QUEUE_STOP_REASON_CSA);
1048 sdata->csa_block_tx = false;
1049 }
1050
1051 sdata->vif.csa_active = false;
1052 ifmgd->csa_waiting_bcn = false;
1053
1054 ret = drv_post_channel_switch(sdata);
1055 if (ret) {
1056 sdata_info(sdata,
1057 "driver post channel switch failed, disconnecting\n");
1058 ieee80211_queue_work(&local->hw,
1059 &ifmgd->csa_connection_drop_work);
1060 return;
1061 }
1062
1063 cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef);
1064 }
1065
1066 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
1067 {
1068 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1069 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1070
1071 trace_api_chswitch_done(sdata, success);
1072 if (!success) {
1073 sdata_info(sdata,
1074 "driver channel switch failed, disconnecting\n");
1075 ieee80211_queue_work(&sdata->local->hw,
1076 &ifmgd->csa_connection_drop_work);
1077 } else {
1078 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1079 }
1080 }
1081 EXPORT_SYMBOL(ieee80211_chswitch_done);
1082
1083 static void ieee80211_chswitch_timer(unsigned long data)
1084 {
1085 struct ieee80211_sub_if_data *sdata =
1086 (struct ieee80211_sub_if_data *) data;
1087
1088 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1089 }
1090
1091 static void
1092 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1093 u64 timestamp, u32 device_timestamp,
1094 struct ieee802_11_elems *elems,
1095 bool beacon)
1096 {
1097 struct ieee80211_local *local = sdata->local;
1098 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1099 struct cfg80211_bss *cbss = ifmgd->associated;
1100 struct ieee80211_chanctx_conf *conf;
1101 struct ieee80211_chanctx *chanctx;
1102 enum ieee80211_band current_band;
1103 struct ieee80211_csa_ie csa_ie;
1104 struct ieee80211_channel_switch ch_switch;
1105 int res;
1106
1107 sdata_assert_lock(sdata);
1108
1109 if (!cbss)
1110 return;
1111
1112 if (local->scanning)
1113 return;
1114
1115 /* disregard subsequent announcements if we are already processing */
1116 if (sdata->vif.csa_active)
1117 return;
1118
1119 current_band = cbss->channel->band;
1120 memset(&csa_ie, 0, sizeof(csa_ie));
1121 res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
1122 ifmgd->flags,
1123 ifmgd->associated->bssid, &csa_ie);
1124 if (res < 0)
1125 ieee80211_queue_work(&local->hw,
1126 &ifmgd->csa_connection_drop_work);
1127 if (res)
1128 return;
1129
1130 if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1131 IEEE80211_CHAN_DISABLED)) {
1132 sdata_info(sdata,
1133 "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1134 ifmgd->associated->bssid,
1135 csa_ie.chandef.chan->center_freq,
1136 csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1137 csa_ie.chandef.center_freq2);
1138 ieee80211_queue_work(&local->hw,
1139 &ifmgd->csa_connection_drop_work);
1140 return;
1141 }
1142
1143 if (cfg80211_chandef_identical(&csa_ie.chandef,
1144 &sdata->vif.bss_conf.chandef)) {
1145 if (ifmgd->csa_ignored_same_chan)
1146 return;
1147 sdata_info(sdata,
1148 "AP %pM tries to chanswitch to same channel, ignore\n",
1149 ifmgd->associated->bssid);
1150 ifmgd->csa_ignored_same_chan = true;
1151 return;
1152 }
1153
1154 /*
1155 * Drop all TDLS peers - either we disconnect or move to a different
1156 * channel from this point on. There's no telling what our peer will do.
1157 * The TDLS WIDER_BW scenario is also problematic, as peers might now
1158 * have an incompatible wider chandef.
1159 */
1160 ieee80211_teardown_tdls_peers(sdata);
1161
1162 mutex_lock(&local->mtx);
1163 mutex_lock(&local->chanctx_mtx);
1164 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1165 lockdep_is_held(&local->chanctx_mtx));
1166 if (!conf) {
1167 sdata_info(sdata,
1168 "no channel context assigned to vif?, disconnecting\n");
1169 goto drop_connection;
1170 }
1171
1172 chanctx = container_of(conf, struct ieee80211_chanctx, conf);
1173
1174 if (local->use_chanctx &&
1175 !ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA)) {
1176 sdata_info(sdata,
1177 "driver doesn't support chan-switch with channel contexts\n");
1178 goto drop_connection;
1179 }
1180
1181 ch_switch.timestamp = timestamp;
1182 ch_switch.device_timestamp = device_timestamp;
1183 ch_switch.block_tx = csa_ie.mode;
1184 ch_switch.chandef = csa_ie.chandef;
1185 ch_switch.count = csa_ie.count;
1186
1187 if (drv_pre_channel_switch(sdata, &ch_switch)) {
1188 sdata_info(sdata,
1189 "preparing for channel switch failed, disconnecting\n");
1190 goto drop_connection;
1191 }
1192
1193 res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
1194 chanctx->mode, false);
1195 if (res) {
1196 sdata_info(sdata,
1197 "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
1198 res);
1199 goto drop_connection;
1200 }
1201 mutex_unlock(&local->chanctx_mtx);
1202
1203 sdata->vif.csa_active = true;
1204 sdata->csa_chandef = csa_ie.chandef;
1205 sdata->csa_block_tx = csa_ie.mode;
1206 ifmgd->csa_ignored_same_chan = false;
1207
1208 if (sdata->csa_block_tx)
1209 ieee80211_stop_vif_queues(local, sdata,
1210 IEEE80211_QUEUE_STOP_REASON_CSA);
1211 mutex_unlock(&local->mtx);
1212
1213 cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
1214 csa_ie.count);
1215
1216 if (local->ops->channel_switch) {
1217 /* use driver's channel switch callback */
1218 drv_channel_switch(local, sdata, &ch_switch);
1219 return;
1220 }
1221
1222 /* channel switch handled in software */
1223 if (csa_ie.count <= 1)
1224 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1225 else
1226 mod_timer(&ifmgd->chswitch_timer,
1227 TU_TO_EXP_TIME((csa_ie.count - 1) *
1228 cbss->beacon_interval));
1229 return;
1230 drop_connection:
1231 ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work);
1232 mutex_unlock(&local->chanctx_mtx);
1233 mutex_unlock(&local->mtx);
1234 }
1235
1236 static bool
1237 ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
1238 struct ieee80211_channel *channel,
1239 const u8 *country_ie, u8 country_ie_len,
1240 const u8 *pwr_constr_elem,
1241 int *chan_pwr, int *pwr_reduction)
1242 {
1243 struct ieee80211_country_ie_triplet *triplet;
1244 int chan = ieee80211_frequency_to_channel(channel->center_freq);
1245 int i, chan_increment;
1246 bool have_chan_pwr = false;
1247
1248 /* Invalid IE */
1249 if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1250 return false;
1251
1252 triplet = (void *)(country_ie + 3);
1253 country_ie_len -= 3;
1254
1255 switch (channel->band) {
1256 default:
1257 WARN_ON_ONCE(1);
1258 /* fall through */
1259 case IEEE80211_BAND_2GHZ:
1260 case IEEE80211_BAND_60GHZ:
1261 chan_increment = 1;
1262 break;
1263 case IEEE80211_BAND_5GHZ:
1264 chan_increment = 4;
1265 break;
1266 }
1267
1268 /* find channel */
1269 while (country_ie_len >= 3) {
1270 u8 first_channel = triplet->chans.first_channel;
1271
1272 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1273 goto next;
1274
1275 for (i = 0; i < triplet->chans.num_channels; i++) {
1276 if (first_channel + i * chan_increment == chan) {
1277 have_chan_pwr = true;
1278 *chan_pwr = triplet->chans.max_power;
1279 break;
1280 }
1281 }
1282 if (have_chan_pwr)
1283 break;
1284
1285 next:
1286 triplet++;
1287 country_ie_len -= 3;
1288 }
1289
1290 if (have_chan_pwr && pwr_constr_elem)
1291 *pwr_reduction = *pwr_constr_elem;
1292 else
1293 *pwr_reduction = 0;
1294
1295 return have_chan_pwr;
1296 }
1297
1298 static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata,
1299 struct ieee80211_channel *channel,
1300 const u8 *cisco_dtpc_ie,
1301 int *pwr_level)
1302 {
1303 /* From practical testing, the first data byte of the DTPC element
1304 * seems to contain the requested dBm level, and the CLI on Cisco
1305 * APs clearly state the range is -127 to 127 dBm, which indicates
1306 * a signed byte, although it seemingly never actually goes negative.
1307 * The other byte seems to always be zero.
1308 */
1309 *pwr_level = (__s8)cisco_dtpc_ie[4];
1310 }
1311
1312 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1313 struct ieee80211_channel *channel,
1314 struct ieee80211_mgmt *mgmt,
1315 const u8 *country_ie, u8 country_ie_len,
1316 const u8 *pwr_constr_ie,
1317 const u8 *cisco_dtpc_ie)
1318 {
1319 bool has_80211h_pwr = false, has_cisco_pwr = false;
1320 int chan_pwr = 0, pwr_reduction_80211h = 0;
1321 int pwr_level_cisco, pwr_level_80211h;
1322 int new_ap_level;
1323 __le16 capab = mgmt->u.probe_resp.capab_info;
1324
1325 if (country_ie &&
1326 (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) ||
1327 capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) {
1328 has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
1329 sdata, channel, country_ie, country_ie_len,
1330 pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1331 pwr_level_80211h =
1332 max_t(int, 0, chan_pwr - pwr_reduction_80211h);
1333 }
1334
1335 if (cisco_dtpc_ie) {
1336 ieee80211_find_cisco_dtpc(
1337 sdata, channel, cisco_dtpc_ie, &pwr_level_cisco);
1338 has_cisco_pwr = true;
1339 }
1340
1341 if (!has_80211h_pwr && !has_cisco_pwr)
1342 return 0;
1343
1344 /* If we have both 802.11h and Cisco DTPC, apply both limits
1345 * by picking the smallest of the two power levels advertised.
1346 */
1347 if (has_80211h_pwr &&
1348 (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) {
1349 new_ap_level = pwr_level_80211h;
1350
1351 if (sdata->ap_power_level == new_ap_level)
1352 return 0;
1353
1354 sdata_dbg(sdata,
1355 "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1356 pwr_level_80211h, chan_pwr, pwr_reduction_80211h,
1357 sdata->u.mgd.bssid);
1358 } else { /* has_cisco_pwr is always true here. */
1359 new_ap_level = pwr_level_cisco;
1360
1361 if (sdata->ap_power_level == new_ap_level)
1362 return 0;
1363
1364 sdata_dbg(sdata,
1365 "Limiting TX power to %d dBm as advertised by %pM\n",
1366 pwr_level_cisco, sdata->u.mgd.bssid);
1367 }
1368
1369 sdata->ap_power_level = new_ap_level;
1370 if (__ieee80211_recalc_txpower(sdata))
1371 return BSS_CHANGED_TXPOWER;
1372 return 0;
1373 }
1374
1375 /* powersave */
1376 static void ieee80211_enable_ps(struct ieee80211_local *local,
1377 struct ieee80211_sub_if_data *sdata)
1378 {
1379 struct ieee80211_conf *conf = &local->hw.conf;
1380
1381 /*
1382 * If we are scanning right now then the parameters will
1383 * take effect when scan finishes.
1384 */
1385 if (local->scanning)
1386 return;
1387
1388 if (conf->dynamic_ps_timeout > 0 &&
1389 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) {
1390 mod_timer(&local->dynamic_ps_timer, jiffies +
1391 msecs_to_jiffies(conf->dynamic_ps_timeout));
1392 } else {
1393 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
1394 ieee80211_send_nullfunc(local, sdata, true);
1395
1396 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1397 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
1398 return;
1399
1400 conf->flags |= IEEE80211_CONF_PS;
1401 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1402 }
1403 }
1404
1405 static void ieee80211_change_ps(struct ieee80211_local *local)
1406 {
1407 struct ieee80211_conf *conf = &local->hw.conf;
1408
1409 if (local->ps_sdata) {
1410 ieee80211_enable_ps(local, local->ps_sdata);
1411 } else if (conf->flags & IEEE80211_CONF_PS) {
1412 conf->flags &= ~IEEE80211_CONF_PS;
1413 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1414 del_timer_sync(&local->dynamic_ps_timer);
1415 cancel_work_sync(&local->dynamic_ps_enable_work);
1416 }
1417 }
1418
1419 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1420 {
1421 struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1422 struct sta_info *sta = NULL;
1423 bool authorized = false;
1424
1425 if (!mgd->powersave)
1426 return false;
1427
1428 if (mgd->broken_ap)
1429 return false;
1430
1431 if (!mgd->associated)
1432 return false;
1433
1434 if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1435 return false;
1436
1437 if (!mgd->have_beacon)
1438 return false;
1439
1440 rcu_read_lock();
1441 sta = sta_info_get(sdata, mgd->bssid);
1442 if (sta)
1443 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1444 rcu_read_unlock();
1445
1446 return authorized;
1447 }
1448
1449 /* need to hold RTNL or interface lock */
1450 void ieee80211_recalc_ps(struct ieee80211_local *local)
1451 {
1452 struct ieee80211_sub_if_data *sdata, *found = NULL;
1453 int count = 0;
1454 int timeout;
1455
1456 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) {
1457 local->ps_sdata = NULL;
1458 return;
1459 }
1460
1461 list_for_each_entry(sdata, &local->interfaces, list) {
1462 if (!ieee80211_sdata_running(sdata))
1463 continue;
1464 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1465 /* If an AP vif is found, then disable PS
1466 * by setting the count to zero thereby setting
1467 * ps_sdata to NULL.
1468 */
1469 count = 0;
1470 break;
1471 }
1472 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1473 continue;
1474 found = sdata;
1475 count++;
1476 }
1477
1478 if (count == 1 && ieee80211_powersave_allowed(found)) {
1479 u8 dtimper = found->u.mgd.dtim_period;
1480 s32 beaconint_us;
1481
1482 beaconint_us = ieee80211_tu_to_usec(
1483 found->vif.bss_conf.beacon_int);
1484
1485 timeout = local->dynamic_ps_forced_timeout;
1486 if (timeout < 0)
1487 timeout = 100;
1488 local->hw.conf.dynamic_ps_timeout = timeout;
1489
1490 /* If the TIM IE is invalid, pretend the value is 1 */
1491 if (!dtimper)
1492 dtimper = 1;
1493
1494 local->hw.conf.ps_dtim_period = dtimper;
1495 local->ps_sdata = found;
1496 } else {
1497 local->ps_sdata = NULL;
1498 }
1499
1500 ieee80211_change_ps(local);
1501 }
1502
1503 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1504 {
1505 bool ps_allowed = ieee80211_powersave_allowed(sdata);
1506
1507 if (sdata->vif.bss_conf.ps != ps_allowed) {
1508 sdata->vif.bss_conf.ps = ps_allowed;
1509 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1510 }
1511 }
1512
1513 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1514 {
1515 struct ieee80211_local *local =
1516 container_of(work, struct ieee80211_local,
1517 dynamic_ps_disable_work);
1518
1519 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1520 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1521 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1522 }
1523
1524 ieee80211_wake_queues_by_reason(&local->hw,
1525 IEEE80211_MAX_QUEUE_MAP,
1526 IEEE80211_QUEUE_STOP_REASON_PS,
1527 false);
1528 }
1529
1530 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1531 {
1532 struct ieee80211_local *local =
1533 container_of(work, struct ieee80211_local,
1534 dynamic_ps_enable_work);
1535 struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1536 struct ieee80211_if_managed *ifmgd;
1537 unsigned long flags;
1538 int q;
1539
1540 /* can only happen when PS was just disabled anyway */
1541 if (!sdata)
1542 return;
1543
1544 ifmgd = &sdata->u.mgd;
1545
1546 if (local->hw.conf.flags & IEEE80211_CONF_PS)
1547 return;
1548
1549 if (local->hw.conf.dynamic_ps_timeout > 0) {
1550 /* don't enter PS if TX frames are pending */
1551 if (drv_tx_frames_pending(local)) {
1552 mod_timer(&local->dynamic_ps_timer, jiffies +
1553 msecs_to_jiffies(
1554 local->hw.conf.dynamic_ps_timeout));
1555 return;
1556 }
1557
1558 /*
1559 * transmission can be stopped by others which leads to
1560 * dynamic_ps_timer expiry. Postpone the ps timer if it
1561 * is not the actual idle state.
1562 */
1563 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1564 for (q = 0; q < local->hw.queues; q++) {
1565 if (local->queue_stop_reasons[q]) {
1566 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1567 flags);
1568 mod_timer(&local->dynamic_ps_timer, jiffies +
1569 msecs_to_jiffies(
1570 local->hw.conf.dynamic_ps_timeout));
1571 return;
1572 }
1573 }
1574 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1575 }
1576
1577 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1578 !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1579 if (drv_tx_frames_pending(local)) {
1580 mod_timer(&local->dynamic_ps_timer, jiffies +
1581 msecs_to_jiffies(
1582 local->hw.conf.dynamic_ps_timeout));
1583 } else {
1584 ieee80211_send_nullfunc(local, sdata, true);
1585 /* Flush to get the tx status of nullfunc frame */
1586 ieee80211_flush_queues(local, sdata, false);
1587 }
1588 }
1589
1590 if (!(ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
1591 ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) ||
1592 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1593 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1594 local->hw.conf.flags |= IEEE80211_CONF_PS;
1595 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1596 }
1597 }
1598
1599 void ieee80211_dynamic_ps_timer(unsigned long data)
1600 {
1601 struct ieee80211_local *local = (void *) data;
1602
1603 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1604 }
1605
1606 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1607 {
1608 struct delayed_work *delayed_work = to_delayed_work(work);
1609 struct ieee80211_sub_if_data *sdata =
1610 container_of(delayed_work, struct ieee80211_sub_if_data,
1611 dfs_cac_timer_work);
1612 struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1613
1614 mutex_lock(&sdata->local->mtx);
1615 if (sdata->wdev.cac_started) {
1616 ieee80211_vif_release_channel(sdata);
1617 cfg80211_cac_event(sdata->dev, &chandef,
1618 NL80211_RADAR_CAC_FINISHED,
1619 GFP_KERNEL);
1620 }
1621 mutex_unlock(&sdata->local->mtx);
1622 }
1623
1624 static bool
1625 __ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1626 {
1627 struct ieee80211_local *local = sdata->local;
1628 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1629 bool ret = false;
1630 int ac;
1631
1632 if (local->hw.queues < IEEE80211_NUM_ACS)
1633 return false;
1634
1635 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1636 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
1637 int non_acm_ac;
1638 unsigned long now = jiffies;
1639
1640 if (tx_tspec->action == TX_TSPEC_ACTION_NONE &&
1641 tx_tspec->admitted_time &&
1642 time_after(now, tx_tspec->time_slice_start + HZ)) {
1643 tx_tspec->consumed_tx_time = 0;
1644 tx_tspec->time_slice_start = now;
1645
1646 if (tx_tspec->downgraded)
1647 tx_tspec->action =
1648 TX_TSPEC_ACTION_STOP_DOWNGRADE;
1649 }
1650
1651 switch (tx_tspec->action) {
1652 case TX_TSPEC_ACTION_STOP_DOWNGRADE:
1653 /* take the original parameters */
1654 if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac]))
1655 sdata_err(sdata,
1656 "failed to set TX queue parameters for queue %d\n",
1657 ac);
1658 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1659 tx_tspec->downgraded = false;
1660 ret = true;
1661 break;
1662 case TX_TSPEC_ACTION_DOWNGRADE:
1663 if (time_after(now, tx_tspec->time_slice_start + HZ)) {
1664 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1665 ret = true;
1666 break;
1667 }
1668 /* downgrade next lower non-ACM AC */
1669 for (non_acm_ac = ac + 1;
1670 non_acm_ac < IEEE80211_NUM_ACS;
1671 non_acm_ac++)
1672 if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac)))
1673 break;
1674 /* The loop will result in using BK even if it requires
1675 * admission control, such configuration makes no sense
1676 * and we have to transmit somehow - the AC selection
1677 * does the same thing.
1678 */
1679 if (drv_conf_tx(local, sdata, ac,
1680 &sdata->tx_conf[non_acm_ac]))
1681 sdata_err(sdata,
1682 "failed to set TX queue parameters for queue %d\n",
1683 ac);
1684 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1685 ret = true;
1686 schedule_delayed_work(&ifmgd->tx_tspec_wk,
1687 tx_tspec->time_slice_start + HZ - now + 1);
1688 break;
1689 case TX_TSPEC_ACTION_NONE:
1690 /* nothing now */
1691 break;
1692 }
1693 }
1694
1695 return ret;
1696 }
1697
1698 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1699 {
1700 if (__ieee80211_sta_handle_tspec_ac_params(sdata))
1701 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
1702 }
1703
1704 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work)
1705 {
1706 struct ieee80211_sub_if_data *sdata;
1707
1708 sdata = container_of(work, struct ieee80211_sub_if_data,
1709 u.mgd.tx_tspec_wk.work);
1710 ieee80211_sta_handle_tspec_ac_params(sdata);
1711 }
1712
1713 /* MLME */
1714 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1715 struct ieee80211_sub_if_data *sdata,
1716 const u8 *wmm_param, size_t wmm_param_len)
1717 {
1718 struct ieee80211_tx_queue_params params[IEEE80211_NUM_ACS];
1719 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1720 size_t left;
1721 int count, ac;
1722 const u8 *pos;
1723 u8 uapsd_queues = 0;
1724
1725 if (!local->ops->conf_tx)
1726 return false;
1727
1728 if (local->hw.queues < IEEE80211_NUM_ACS)
1729 return false;
1730
1731 if (!wmm_param)
1732 return false;
1733
1734 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1735 return false;
1736
1737 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1738 uapsd_queues = ifmgd->uapsd_queues;
1739
1740 count = wmm_param[6] & 0x0f;
1741 if (count == ifmgd->wmm_last_param_set)
1742 return false;
1743 ifmgd->wmm_last_param_set = count;
1744
1745 pos = wmm_param + 8;
1746 left = wmm_param_len - 8;
1747
1748 memset(&params, 0, sizeof(params));
1749
1750 sdata->wmm_acm = 0;
1751 for (; left >= 4; left -= 4, pos += 4) {
1752 int aci = (pos[0] >> 5) & 0x03;
1753 int acm = (pos[0] >> 4) & 0x01;
1754 bool uapsd = false;
1755
1756 switch (aci) {
1757 case 1: /* AC_BK */
1758 ac = IEEE80211_AC_BK;
1759 if (acm)
1760 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1761 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1762 uapsd = true;
1763 break;
1764 case 2: /* AC_VI */
1765 ac = IEEE80211_AC_VI;
1766 if (acm)
1767 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1768 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1769 uapsd = true;
1770 break;
1771 case 3: /* AC_VO */
1772 ac = IEEE80211_AC_VO;
1773 if (acm)
1774 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1775 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1776 uapsd = true;
1777 break;
1778 case 0: /* AC_BE */
1779 default:
1780 ac = IEEE80211_AC_BE;
1781 if (acm)
1782 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1783 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1784 uapsd = true;
1785 break;
1786 }
1787
1788 params[ac].aifs = pos[0] & 0x0f;
1789
1790 if (params[ac].aifs < 2) {
1791 sdata_info(sdata,
1792 "AP has invalid WMM params (AIFSN=%d for ACI %d), will use 2\n",
1793 params[ac].aifs, aci);
1794 params[ac].aifs = 2;
1795 }
1796 params[ac].cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1797 params[ac].cw_min = ecw2cw(pos[1] & 0x0f);
1798 params[ac].txop = get_unaligned_le16(pos + 2);
1799 params[ac].acm = acm;
1800 params[ac].uapsd = uapsd;
1801
1802 if (params[ac].cw_min > params[ac].cw_max) {
1803 sdata_info(sdata,
1804 "AP has invalid WMM params (CWmin/max=%d/%d for ACI %d), using defaults\n",
1805 params[ac].cw_min, params[ac].cw_max, aci);
1806 return false;
1807 }
1808 }
1809
1810 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1811 mlme_dbg(sdata,
1812 "WMM AC=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n",
1813 ac, params[ac].acm,
1814 params[ac].aifs, params[ac].cw_min, params[ac].cw_max,
1815 params[ac].txop, params[ac].uapsd,
1816 ifmgd->tx_tspec[ac].downgraded);
1817 sdata->tx_conf[ac] = params[ac];
1818 if (!ifmgd->tx_tspec[ac].downgraded &&
1819 drv_conf_tx(local, sdata, ac, &params[ac]))
1820 sdata_err(sdata,
1821 "failed to set TX queue parameters for AC %d\n",
1822 ac);
1823 }
1824
1825 /* enable WMM or activate new settings */
1826 sdata->vif.bss_conf.qos = true;
1827 return true;
1828 }
1829
1830 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1831 {
1832 lockdep_assert_held(&sdata->local->mtx);
1833
1834 sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1835 ieee80211_run_deferred_scan(sdata->local);
1836 }
1837
1838 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1839 {
1840 mutex_lock(&sdata->local->mtx);
1841 __ieee80211_stop_poll(sdata);
1842 mutex_unlock(&sdata->local->mtx);
1843 }
1844
1845 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1846 u16 capab, bool erp_valid, u8 erp)
1847 {
1848 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1849 u32 changed = 0;
1850 bool use_protection;
1851 bool use_short_preamble;
1852 bool use_short_slot;
1853
1854 if (erp_valid) {
1855 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1856 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1857 } else {
1858 use_protection = false;
1859 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1860 }
1861
1862 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1863 if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1864 use_short_slot = true;
1865
1866 if (use_protection != bss_conf->use_cts_prot) {
1867 bss_conf->use_cts_prot = use_protection;
1868 changed |= BSS_CHANGED_ERP_CTS_PROT;
1869 }
1870
1871 if (use_short_preamble != bss_conf->use_short_preamble) {
1872 bss_conf->use_short_preamble = use_short_preamble;
1873 changed |= BSS_CHANGED_ERP_PREAMBLE;
1874 }
1875
1876 if (use_short_slot != bss_conf->use_short_slot) {
1877 bss_conf->use_short_slot = use_short_slot;
1878 changed |= BSS_CHANGED_ERP_SLOT;
1879 }
1880
1881 return changed;
1882 }
1883
1884 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1885 struct cfg80211_bss *cbss,
1886 u32 bss_info_changed)
1887 {
1888 struct ieee80211_bss *bss = (void *)cbss->priv;
1889 struct ieee80211_local *local = sdata->local;
1890 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1891
1892 bss_info_changed |= BSS_CHANGED_ASSOC;
1893 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1894 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1895
1896 sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1897 beacon_loss_count * bss_conf->beacon_int));
1898
1899 sdata->u.mgd.associated = cbss;
1900 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1901
1902 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1903
1904 if (sdata->vif.p2p ||
1905 sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) {
1906 const struct cfg80211_bss_ies *ies;
1907
1908 rcu_read_lock();
1909 ies = rcu_dereference(cbss->ies);
1910 if (ies) {
1911 int ret;
1912
1913 ret = cfg80211_get_p2p_attr(
1914 ies->data, ies->len,
1915 IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1916 (u8 *) &bss_conf->p2p_noa_attr,
1917 sizeof(bss_conf->p2p_noa_attr));
1918 if (ret >= 2) {
1919 sdata->u.mgd.p2p_noa_index =
1920 bss_conf->p2p_noa_attr.index;
1921 bss_info_changed |= BSS_CHANGED_P2P_PS;
1922 }
1923 }
1924 rcu_read_unlock();
1925 }
1926
1927 /* just to be sure */
1928 ieee80211_stop_poll(sdata);
1929
1930 ieee80211_led_assoc(local, 1);
1931
1932 if (sdata->u.mgd.have_beacon) {
1933 /*
1934 * If the AP is buggy we may get here with no DTIM period
1935 * known, so assume it's 1 which is the only safe assumption
1936 * in that case, although if the TIM IE is broken powersave
1937 * probably just won't work at all.
1938 */
1939 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1940 bss_conf->beacon_rate = bss->beacon_rate;
1941 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1942 } else {
1943 bss_conf->beacon_rate = NULL;
1944 bss_conf->dtim_period = 0;
1945 }
1946
1947 bss_conf->assoc = 1;
1948
1949 /* Tell the driver to monitor connection quality (if supported) */
1950 if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1951 bss_conf->cqm_rssi_thold)
1952 bss_info_changed |= BSS_CHANGED_CQM;
1953
1954 /* Enable ARP filtering */
1955 if (bss_conf->arp_addr_cnt)
1956 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1957
1958 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1959
1960 mutex_lock(&local->iflist_mtx);
1961 ieee80211_recalc_ps(local);
1962 mutex_unlock(&local->iflist_mtx);
1963
1964 ieee80211_recalc_smps(sdata);
1965 ieee80211_recalc_ps_vif(sdata);
1966
1967 netif_carrier_on(sdata->dev);
1968 }
1969
1970 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1971 u16 stype, u16 reason, bool tx,
1972 u8 *frame_buf)
1973 {
1974 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1975 struct ieee80211_local *local = sdata->local;
1976 u32 changed = 0;
1977
1978 sdata_assert_lock(sdata);
1979
1980 if (WARN_ON_ONCE(tx && !frame_buf))
1981 return;
1982
1983 if (WARN_ON(!ifmgd->associated))
1984 return;
1985
1986 ieee80211_stop_poll(sdata);
1987
1988 ifmgd->associated = NULL;
1989 netif_carrier_off(sdata->dev);
1990
1991 /*
1992 * if we want to get out of ps before disassoc (why?) we have
1993 * to do it before sending disassoc, as otherwise the null-packet
1994 * won't be valid.
1995 */
1996 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1997 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1998 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1999 }
2000 local->ps_sdata = NULL;
2001
2002 /* disable per-vif ps */
2003 ieee80211_recalc_ps_vif(sdata);
2004
2005 /* make sure ongoing transmission finishes */
2006 synchronize_net();
2007
2008 /*
2009 * drop any frame before deauth/disassoc, this can be data or
2010 * management frame. Since we are disconnecting, we should not
2011 * insist sending these frames which can take time and delay
2012 * the disconnection and possible the roaming.
2013 */
2014 if (tx)
2015 ieee80211_flush_queues(local, sdata, true);
2016
2017 /* deauthenticate/disassociate now */
2018 if (tx || frame_buf)
2019 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
2020 reason, tx, frame_buf);
2021
2022 /* flush out frame - make sure the deauth was actually sent */
2023 if (tx)
2024 ieee80211_flush_queues(local, sdata, false);
2025
2026 /* clear bssid only after building the needed mgmt frames */
2027 eth_zero_addr(ifmgd->bssid);
2028
2029 /* remove AP and TDLS peers */
2030 sta_info_flush(sdata);
2031
2032 /* finally reset all BSS / config parameters */
2033 changed |= ieee80211_reset_erp_info(sdata);
2034
2035 ieee80211_led_assoc(local, 0);
2036 changed |= BSS_CHANGED_ASSOC;
2037 sdata->vif.bss_conf.assoc = false;
2038
2039 ifmgd->p2p_noa_index = -1;
2040 memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
2041 sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2042
2043 /* on the next assoc, re-program HT/VHT parameters */
2044 memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
2045 memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2046 memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
2047 memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2048
2049 /* reset MU-MIMO ownership and group data */
2050 memset(sdata->vif.bss_conf.mu_group.membership, 0,
2051 sizeof(sdata->vif.bss_conf.mu_group.membership));
2052 memset(sdata->vif.bss_conf.mu_group.position, 0,
2053 sizeof(sdata->vif.bss_conf.mu_group.position));
2054 changed |= BSS_CHANGED_MU_GROUPS;
2055 sdata->flags &= ~IEEE80211_SDATA_MU_MIMO_OWNER;
2056
2057 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2058
2059 del_timer_sync(&local->dynamic_ps_timer);
2060 cancel_work_sync(&local->dynamic_ps_enable_work);
2061
2062 /* Disable ARP filtering */
2063 if (sdata->vif.bss_conf.arp_addr_cnt)
2064 changed |= BSS_CHANGED_ARP_FILTER;
2065
2066 sdata->vif.bss_conf.qos = false;
2067 changed |= BSS_CHANGED_QOS;
2068
2069 /* The BSSID (not really interesting) and HT changed */
2070 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
2071 ieee80211_bss_info_change_notify(sdata, changed);
2072
2073 /* disassociated - set to defaults now */
2074 ieee80211_set_wmm_default(sdata, false, false);
2075
2076 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
2077 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
2078 del_timer_sync(&sdata->u.mgd.timer);
2079 del_timer_sync(&sdata->u.mgd.chswitch_timer);
2080
2081 sdata->vif.bss_conf.dtim_period = 0;
2082 sdata->vif.bss_conf.beacon_rate = NULL;
2083
2084 ifmgd->have_beacon = false;
2085
2086 ifmgd->flags = 0;
2087 mutex_lock(&local->mtx);
2088 ieee80211_vif_release_channel(sdata);
2089
2090 sdata->vif.csa_active = false;
2091 ifmgd->csa_waiting_bcn = false;
2092 ifmgd->csa_ignored_same_chan = false;
2093 if (sdata->csa_block_tx) {
2094 ieee80211_wake_vif_queues(local, sdata,
2095 IEEE80211_QUEUE_STOP_REASON_CSA);
2096 sdata->csa_block_tx = false;
2097 }
2098 mutex_unlock(&local->mtx);
2099
2100 /* existing TX TSPEC sessions no longer exist */
2101 memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
2102 cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);
2103
2104 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2105 }
2106
2107 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
2108 struct ieee80211_hdr *hdr)
2109 {
2110 /*
2111 * We can postpone the mgd.timer whenever receiving unicast frames
2112 * from AP because we know that the connection is working both ways
2113 * at that time. But multicast frames (and hence also beacons) must
2114 * be ignored here, because we need to trigger the timer during
2115 * data idle periods for sending the periodic probe request to the
2116 * AP we're connected to.
2117 */
2118 if (is_multicast_ether_addr(hdr->addr1))
2119 return;
2120
2121 ieee80211_sta_reset_conn_monitor(sdata);
2122 }
2123
2124 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
2125 {
2126 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2127 struct ieee80211_local *local = sdata->local;
2128
2129 mutex_lock(&local->mtx);
2130 if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
2131 goto out;
2132
2133 __ieee80211_stop_poll(sdata);
2134
2135 mutex_lock(&local->iflist_mtx);
2136 ieee80211_recalc_ps(local);
2137 mutex_unlock(&local->iflist_mtx);
2138
2139 if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
2140 goto out;
2141
2142 /*
2143 * We've received a probe response, but are not sure whether
2144 * we have or will be receiving any beacons or data, so let's
2145 * schedule the timers again, just in case.
2146 */
2147 ieee80211_sta_reset_beacon_monitor(sdata);
2148
2149 mod_timer(&ifmgd->conn_mon_timer,
2150 round_jiffies_up(jiffies +
2151 IEEE80211_CONNECTION_IDLE_TIME));
2152 out:
2153 mutex_unlock(&local->mtx);
2154 }
2155
2156 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
2157 struct ieee80211_hdr *hdr,
2158 u16 tx_time)
2159 {
2160 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2161 u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2162 int ac = ieee80211_ac_from_tid(tid);
2163 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
2164 unsigned long now = jiffies;
2165
2166 if (likely(!tx_tspec->admitted_time))
2167 return;
2168
2169 if (time_after(now, tx_tspec->time_slice_start + HZ)) {
2170 tx_tspec->consumed_tx_time = 0;
2171 tx_tspec->time_slice_start = now;
2172
2173 if (tx_tspec->downgraded) {
2174 tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE;
2175 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2176 }
2177 }
2178
2179 if (tx_tspec->downgraded)
2180 return;
2181
2182 tx_tspec->consumed_tx_time += tx_time;
2183
2184 if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) {
2185 tx_tspec->downgraded = true;
2186 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE;
2187 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2188 }
2189 }
2190
2191 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2192 struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2193 {
2194 ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);
2195
2196 if (!ieee80211_is_data(hdr->frame_control))
2197 return;
2198
2199 if (ieee80211_is_nullfunc(hdr->frame_control) &&
2200 sdata->u.mgd.probe_send_count > 0) {
2201 if (ack)
2202 ieee80211_sta_reset_conn_monitor(sdata);
2203 else
2204 sdata->u.mgd.nullfunc_failed = true;
2205 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2206 return;
2207 }
2208
2209 if (ack)
2210 ieee80211_sta_reset_conn_monitor(sdata);
2211 }
2212
2213 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
2214 {
2215 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2216 const u8 *ssid;
2217 u8 *dst = ifmgd->associated->bssid;
2218 u8 unicast_limit = max(1, max_probe_tries - 3);
2219
2220 /*
2221 * Try sending broadcast probe requests for the last three
2222 * probe requests after the first ones failed since some
2223 * buggy APs only support broadcast probe requests.
2224 */
2225 if (ifmgd->probe_send_count >= unicast_limit)
2226 dst = NULL;
2227
2228 /*
2229 * When the hardware reports an accurate Tx ACK status, it's
2230 * better to send a nullfunc frame instead of a probe request,
2231 * as it will kick us off the AP quickly if we aren't associated
2232 * anymore. The timeout will be reset if the frame is ACKed by
2233 * the AP.
2234 */
2235 ifmgd->probe_send_count++;
2236
2237 if (ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
2238 ifmgd->nullfunc_failed = false;
2239 ieee80211_send_nullfunc(sdata->local, sdata, false);
2240 } else {
2241 int ssid_len;
2242
2243 rcu_read_lock();
2244 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2245 if (WARN_ON_ONCE(ssid == NULL))
2246 ssid_len = 0;
2247 else
2248 ssid_len = ssid[1];
2249
2250 ieee80211_send_probe_req(sdata, sdata->vif.addr, dst,
2251 ssid + 2, ssid_len, NULL,
2252 0, (u32) -1, true, 0,
2253 ifmgd->associated->channel, false);
2254 rcu_read_unlock();
2255 }
2256
2257 ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2258 run_again(sdata, ifmgd->probe_timeout);
2259 }
2260
2261 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
2262 bool beacon)
2263 {
2264 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2265 bool already = false;
2266
2267 if (!ieee80211_sdata_running(sdata))
2268 return;
2269
2270 sdata_lock(sdata);
2271
2272 if (!ifmgd->associated)
2273 goto out;
2274
2275 mutex_lock(&sdata->local->mtx);
2276
2277 if (sdata->local->tmp_channel || sdata->local->scanning) {
2278 mutex_unlock(&sdata->local->mtx);
2279 goto out;
2280 }
2281
2282 if (beacon) {
2283 mlme_dbg_ratelimited(sdata,
2284 "detected beacon loss from AP (missed %d beacons) - probing\n",
2285 beacon_loss_count);
2286
2287 ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL);
2288 }
2289
2290 /*
2291 * The driver/our work has already reported this event or the
2292 * connection monitoring has kicked in and we have already sent
2293 * a probe request. Or maybe the AP died and the driver keeps
2294 * reporting until we disassociate...
2295 *
2296 * In either case we have to ignore the current call to this
2297 * function (except for setting the correct probe reason bit)
2298 * because otherwise we would reset the timer every time and
2299 * never check whether we received a probe response!
2300 */
2301 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
2302 already = true;
2303
2304 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2305
2306 mutex_unlock(&sdata->local->mtx);
2307
2308 if (already)
2309 goto out;
2310
2311 mutex_lock(&sdata->local->iflist_mtx);
2312 ieee80211_recalc_ps(sdata->local);
2313 mutex_unlock(&sdata->local->iflist_mtx);
2314
2315 ifmgd->probe_send_count = 0;
2316 ieee80211_mgd_probe_ap_send(sdata);
2317 out:
2318 sdata_unlock(sdata);
2319 }
2320
2321 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2322 struct ieee80211_vif *vif)
2323 {
2324 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2325 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2326 struct cfg80211_bss *cbss;
2327 struct sk_buff *skb;
2328 const u8 *ssid;
2329 int ssid_len;
2330
2331 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2332 return NULL;
2333
2334 sdata_assert_lock(sdata);
2335
2336 if (ifmgd->associated)
2337 cbss = ifmgd->associated;
2338 else if (ifmgd->auth_data)
2339 cbss = ifmgd->auth_data->bss;
2340 else if (ifmgd->assoc_data)
2341 cbss = ifmgd->assoc_data->bss;
2342 else
2343 return NULL;
2344
2345 rcu_read_lock();
2346 ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2347 if (WARN_ON_ONCE(ssid == NULL))
2348 ssid_len = 0;
2349 else
2350 ssid_len = ssid[1];
2351
2352 skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
2353 (u32) -1, cbss->channel,
2354 ssid + 2, ssid_len,
2355 NULL, 0, true);
2356 rcu_read_unlock();
2357
2358 return skb;
2359 }
2360 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2361
2362 static void ieee80211_report_disconnect(struct ieee80211_sub_if_data *sdata,
2363 const u8 *buf, size_t len, bool tx,
2364 u16 reason)
2365 {
2366 struct ieee80211_event event = {
2367 .type = MLME_EVENT,
2368 .u.mlme.data = tx ? DEAUTH_TX_EVENT : DEAUTH_RX_EVENT,
2369 .u.mlme.reason = reason,
2370 };
2371
2372 if (tx)
2373 cfg80211_tx_mlme_mgmt(sdata->dev, buf, len);
2374 else
2375 cfg80211_rx_mlme_mgmt(sdata->dev, buf, len);
2376
2377 drv_event_callback(sdata->local, sdata, &event);
2378 }
2379
2380 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2381 {
2382 struct ieee80211_local *local = sdata->local;
2383 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2384 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2385
2386 sdata_lock(sdata);
2387 if (!ifmgd->associated) {
2388 sdata_unlock(sdata);
2389 return;
2390 }
2391
2392 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2393 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2394 true, frame_buf);
2395 mutex_lock(&local->mtx);
2396 sdata->vif.csa_active = false;
2397 ifmgd->csa_waiting_bcn = false;
2398 if (sdata->csa_block_tx) {
2399 ieee80211_wake_vif_queues(local, sdata,
2400 IEEE80211_QUEUE_STOP_REASON_CSA);
2401 sdata->csa_block_tx = false;
2402 }
2403 mutex_unlock(&local->mtx);
2404
2405 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
2406 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2407
2408 sdata_unlock(sdata);
2409 }
2410
2411 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2412 {
2413 struct ieee80211_sub_if_data *sdata =
2414 container_of(work, struct ieee80211_sub_if_data,
2415 u.mgd.beacon_connection_loss_work);
2416 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2417
2418 if (ifmgd->associated)
2419 ifmgd->beacon_loss_count++;
2420
2421 if (ifmgd->connection_loss) {
2422 sdata_info(sdata, "Connection to AP %pM lost\n",
2423 ifmgd->bssid);
2424 __ieee80211_disconnect(sdata);
2425 } else {
2426 ieee80211_mgd_probe_ap(sdata, true);
2427 }
2428 }
2429
2430 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2431 {
2432 struct ieee80211_sub_if_data *sdata =
2433 container_of(work, struct ieee80211_sub_if_data,
2434 u.mgd.csa_connection_drop_work);
2435
2436 __ieee80211_disconnect(sdata);
2437 }
2438
2439 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2440 {
2441 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2442 struct ieee80211_hw *hw = &sdata->local->hw;
2443
2444 trace_api_beacon_loss(sdata);
2445
2446 sdata->u.mgd.connection_loss = false;
2447 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2448 }
2449 EXPORT_SYMBOL(ieee80211_beacon_loss);
2450
2451 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2452 {
2453 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2454 struct ieee80211_hw *hw = &sdata->local->hw;
2455
2456 trace_api_connection_loss(sdata);
2457
2458 sdata->u.mgd.connection_loss = true;
2459 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2460 }
2461 EXPORT_SYMBOL(ieee80211_connection_loss);
2462
2463
2464 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2465 bool assoc)
2466 {
2467 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2468
2469 sdata_assert_lock(sdata);
2470
2471 if (!assoc) {
2472 /*
2473 * we are not authenticated yet, the only timer that could be
2474 * running is the timeout for the authentication response which
2475 * which is not relevant anymore.
2476 */
2477 del_timer_sync(&sdata->u.mgd.timer);
2478 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2479
2480 eth_zero_addr(sdata->u.mgd.bssid);
2481 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2482 sdata->u.mgd.flags = 0;
2483 mutex_lock(&sdata->local->mtx);
2484 ieee80211_vif_release_channel(sdata);
2485 mutex_unlock(&sdata->local->mtx);
2486 }
2487
2488 cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2489 kfree(auth_data);
2490 sdata->u.mgd.auth_data = NULL;
2491 }
2492
2493 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2494 bool assoc)
2495 {
2496 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2497
2498 sdata_assert_lock(sdata);
2499
2500 if (!assoc) {
2501 /*
2502 * we are not associated yet, the only timer that could be
2503 * running is the timeout for the association response which
2504 * which is not relevant anymore.
2505 */
2506 del_timer_sync(&sdata->u.mgd.timer);
2507 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2508
2509 eth_zero_addr(sdata->u.mgd.bssid);
2510 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2511 sdata->u.mgd.flags = 0;
2512 sdata->flags &= ~IEEE80211_SDATA_MU_MIMO_OWNER;
2513 mutex_lock(&sdata->local->mtx);
2514 ieee80211_vif_release_channel(sdata);
2515 mutex_unlock(&sdata->local->mtx);
2516 }
2517
2518 kfree(assoc_data);
2519 sdata->u.mgd.assoc_data = NULL;
2520 }
2521
2522 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2523 struct ieee80211_mgmt *mgmt, size_t len)
2524 {
2525 struct ieee80211_local *local = sdata->local;
2526 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2527 u8 *pos;
2528 struct ieee802_11_elems elems;
2529 u32 tx_flags = 0;
2530
2531 pos = mgmt->u.auth.variable;
2532 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2533 if (!elems.challenge)
2534 return;
2535 auth_data->expected_transaction = 4;
2536 drv_mgd_prepare_tx(sdata->local, sdata);
2537 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
2538 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2539 IEEE80211_TX_INTFL_MLME_CONN_TX;
2540 ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2541 elems.challenge - 2, elems.challenge_len + 2,
2542 auth_data->bss->bssid, auth_data->bss->bssid,
2543 auth_data->key, auth_data->key_len,
2544 auth_data->key_idx, tx_flags);
2545 }
2546
2547 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2548 struct ieee80211_mgmt *mgmt, size_t len)
2549 {
2550 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2551 u8 bssid[ETH_ALEN];
2552 u16 auth_alg, auth_transaction, status_code;
2553 struct sta_info *sta;
2554 struct ieee80211_event event = {
2555 .type = MLME_EVENT,
2556 .u.mlme.data = AUTH_EVENT,
2557 };
2558
2559 sdata_assert_lock(sdata);
2560
2561 if (len < 24 + 6)
2562 return;
2563
2564 if (!ifmgd->auth_data || ifmgd->auth_data->done)
2565 return;
2566
2567 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2568
2569 if (!ether_addr_equal(bssid, mgmt->bssid))
2570 return;
2571
2572 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2573 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2574 status_code = le16_to_cpu(mgmt->u.auth.status_code);
2575
2576 if (auth_alg != ifmgd->auth_data->algorithm ||
2577 auth_transaction != ifmgd->auth_data->expected_transaction) {
2578 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2579 mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2580 auth_transaction,
2581 ifmgd->auth_data->expected_transaction);
2582 return;
2583 }
2584
2585 if (status_code != WLAN_STATUS_SUCCESS) {
2586 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2587 mgmt->sa, status_code);
2588 ieee80211_destroy_auth_data(sdata, false);
2589 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2590 event.u.mlme.status = MLME_DENIED;
2591 event.u.mlme.reason = status_code;
2592 drv_event_callback(sdata->local, sdata, &event);
2593 return;
2594 }
2595
2596 switch (ifmgd->auth_data->algorithm) {
2597 case WLAN_AUTH_OPEN:
2598 case WLAN_AUTH_LEAP:
2599 case WLAN_AUTH_FT:
2600 case WLAN_AUTH_SAE:
2601 break;
2602 case WLAN_AUTH_SHARED_KEY:
2603 if (ifmgd->auth_data->expected_transaction != 4) {
2604 ieee80211_auth_challenge(sdata, mgmt, len);
2605 /* need another frame */
2606 return;
2607 }
2608 break;
2609 default:
2610 WARN_ONCE(1, "invalid auth alg %d",
2611 ifmgd->auth_data->algorithm);
2612 return;
2613 }
2614
2615 event.u.mlme.status = MLME_SUCCESS;
2616 drv_event_callback(sdata->local, sdata, &event);
2617 sdata_info(sdata, "authenticated\n");
2618 ifmgd->auth_data->done = true;
2619 ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2620 ifmgd->auth_data->timeout_started = true;
2621 run_again(sdata, ifmgd->auth_data->timeout);
2622
2623 if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2624 ifmgd->auth_data->expected_transaction != 2) {
2625 /*
2626 * Report auth frame to user space for processing since another
2627 * round of Authentication frames is still needed.
2628 */
2629 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2630 return;
2631 }
2632
2633 /* move station state to auth */
2634 mutex_lock(&sdata->local->sta_mtx);
2635 sta = sta_info_get(sdata, bssid);
2636 if (!sta) {
2637 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2638 goto out_err;
2639 }
2640 if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2641 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2642 goto out_err;
2643 }
2644 mutex_unlock(&sdata->local->sta_mtx);
2645
2646 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2647 return;
2648 out_err:
2649 mutex_unlock(&sdata->local->sta_mtx);
2650 /* ignore frame -- wait for timeout */
2651 }
2652
2653 #define case_WLAN(type) \
2654 case WLAN_REASON_##type: return #type
2655
2656 static const char *ieee80211_get_reason_code_string(u16 reason_code)
2657 {
2658 switch (reason_code) {
2659 case_WLAN(UNSPECIFIED);
2660 case_WLAN(PREV_AUTH_NOT_VALID);
2661 case_WLAN(DEAUTH_LEAVING);
2662 case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2663 case_WLAN(DISASSOC_AP_BUSY);
2664 case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2665 case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2666 case_WLAN(DISASSOC_STA_HAS_LEFT);
2667 case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2668 case_WLAN(DISASSOC_BAD_POWER);
2669 case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2670 case_WLAN(INVALID_IE);
2671 case_WLAN(MIC_FAILURE);
2672 case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2673 case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2674 case_WLAN(IE_DIFFERENT);
2675 case_WLAN(INVALID_GROUP_CIPHER);
2676 case_WLAN(INVALID_PAIRWISE_CIPHER);
2677 case_WLAN(INVALID_AKMP);
2678 case_WLAN(UNSUPP_RSN_VERSION);
2679 case_WLAN(INVALID_RSN_IE_CAP);
2680 case_WLAN(IEEE8021X_FAILED);
2681 case_WLAN(CIPHER_SUITE_REJECTED);
2682 case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2683 case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2684 case_WLAN(DISASSOC_LOW_ACK);
2685 case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2686 case_WLAN(QSTA_LEAVE_QBSS);
2687 case_WLAN(QSTA_NOT_USE);
2688 case_WLAN(QSTA_REQUIRE_SETUP);
2689 case_WLAN(QSTA_TIMEOUT);
2690 case_WLAN(QSTA_CIPHER_NOT_SUPP);
2691 case_WLAN(MESH_PEER_CANCELED);
2692 case_WLAN(MESH_MAX_PEERS);
2693 case_WLAN(MESH_CONFIG);
2694 case_WLAN(MESH_CLOSE);
2695 case_WLAN(MESH_MAX_RETRIES);
2696 case_WLAN(MESH_CONFIRM_TIMEOUT);
2697 case_WLAN(MESH_INVALID_GTK);
2698 case_WLAN(MESH_INCONSISTENT_PARAM);
2699 case_WLAN(MESH_INVALID_SECURITY);
2700 case_WLAN(MESH_PATH_ERROR);
2701 case_WLAN(MESH_PATH_NOFORWARD);
2702 case_WLAN(MESH_PATH_DEST_UNREACHABLE);
2703 case_WLAN(MAC_EXISTS_IN_MBSS);
2704 case_WLAN(MESH_CHAN_REGULATORY);
2705 case_WLAN(MESH_CHAN);
2706 default: return "<unknown>";
2707 }
2708 }
2709
2710 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2711 struct ieee80211_mgmt *mgmt, size_t len)
2712 {
2713 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2714 u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2715
2716 sdata_assert_lock(sdata);
2717
2718 if (len < 24 + 2)
2719 return;
2720
2721 if (ifmgd->associated &&
2722 ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) {
2723 const u8 *bssid = ifmgd->associated->bssid;
2724
2725 sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
2726 bssid, reason_code,
2727 ieee80211_get_reason_code_string(reason_code));
2728
2729 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2730
2731 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false,
2732 reason_code);
2733 return;
2734 }
2735
2736 if (ifmgd->assoc_data &&
2737 ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2738 const u8 *bssid = ifmgd->assoc_data->bss->bssid;
2739
2740 sdata_info(sdata,
2741 "deauthenticated from %pM while associating (Reason: %u=%s)\n",
2742 bssid, reason_code,
2743 ieee80211_get_reason_code_string(reason_code));
2744
2745 ieee80211_destroy_assoc_data(sdata, false);
2746
2747 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2748 return;
2749 }
2750 }
2751
2752
2753 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2754 struct ieee80211_mgmt *mgmt, size_t len)
2755 {
2756 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2757 u16 reason_code;
2758
2759 sdata_assert_lock(sdata);
2760
2761 if (len < 24 + 2)
2762 return;
2763
2764 if (!ifmgd->associated ||
2765 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2766 return;
2767
2768 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2769
2770 sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2771 mgmt->sa, reason_code);
2772
2773 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2774
2775 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code);
2776 }
2777
2778 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2779 u8 *supp_rates, unsigned int supp_rates_len,
2780 u32 *rates, u32 *basic_rates,
2781 bool *have_higher_than_11mbit,
2782 int *min_rate, int *min_rate_index,
2783 int shift, u32 rate_flags)
2784 {
2785 int i, j;
2786
2787 for (i = 0; i < supp_rates_len; i++) {
2788 int rate = supp_rates[i] & 0x7f;
2789 bool is_basic = !!(supp_rates[i] & 0x80);
2790
2791 if ((rate * 5 * (1 << shift)) > 110)
2792 *have_higher_than_11mbit = true;
2793
2794 /*
2795 * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2796 * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2797 *
2798 * Note: Even through the membership selector and the basic
2799 * rate flag share the same bit, they are not exactly
2800 * the same.
2801 */
2802 if (!!(supp_rates[i] & 0x80) &&
2803 (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2804 continue;
2805
2806 for (j = 0; j < sband->n_bitrates; j++) {
2807 struct ieee80211_rate *br;
2808 int brate;
2809
2810 br = &sband->bitrates[j];
2811 if ((rate_flags & br->flags) != rate_flags)
2812 continue;
2813
2814 brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2815 if (brate == rate) {
2816 *rates |= BIT(j);
2817 if (is_basic)
2818 *basic_rates |= BIT(j);
2819 if ((rate * 5) < *min_rate) {
2820 *min_rate = rate * 5;
2821 *min_rate_index = j;
2822 }
2823 break;
2824 }
2825 }
2826 }
2827 }
2828
2829 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2830 struct cfg80211_bss *cbss,
2831 struct ieee80211_mgmt *mgmt, size_t len)
2832 {
2833 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2834 struct ieee80211_local *local = sdata->local;
2835 struct ieee80211_supported_band *sband;
2836 struct sta_info *sta;
2837 u8 *pos;
2838 u16 capab_info, aid;
2839 struct ieee802_11_elems elems;
2840 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2841 const struct cfg80211_bss_ies *bss_ies = NULL;
2842 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2843 u32 changed = 0;
2844 int err;
2845 bool ret;
2846
2847 /* AssocResp and ReassocResp have identical structure */
2848
2849 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2850 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2851
2852 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2853 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2854 aid);
2855 aid &= ~(BIT(15) | BIT(14));
2856
2857 ifmgd->broken_ap = false;
2858
2859 if (aid == 0 || aid > IEEE80211_MAX_AID) {
2860 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2861 aid);
2862 aid = 0;
2863 ifmgd->broken_ap = true;
2864 }
2865
2866 pos = mgmt->u.assoc_resp.variable;
2867 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2868
2869 if (!elems.supp_rates) {
2870 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2871 return false;
2872 }
2873
2874 ifmgd->aid = aid;
2875 ifmgd->tdls_chan_switch_prohibited =
2876 elems.ext_capab && elems.ext_capab_len >= 5 &&
2877 (elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
2878
2879 /*
2880 * Some APs are erroneously not including some information in their
2881 * (re)association response frames. Try to recover by using the data
2882 * from the beacon or probe response. This seems to afflict mobile
2883 * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2884 * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2885 */
2886 if ((assoc_data->wmm && !elems.wmm_param) ||
2887 (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2888 (!elems.ht_cap_elem || !elems.ht_operation)) ||
2889 (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2890 (!elems.vht_cap_elem || !elems.vht_operation))) {
2891 const struct cfg80211_bss_ies *ies;
2892 struct ieee802_11_elems bss_elems;
2893
2894 rcu_read_lock();
2895 ies = rcu_dereference(cbss->ies);
2896 if (ies)
2897 bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2898 GFP_ATOMIC);
2899 rcu_read_unlock();
2900 if (!bss_ies)
2901 return false;
2902
2903 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2904 false, &bss_elems);
2905 if (assoc_data->wmm &&
2906 !elems.wmm_param && bss_elems.wmm_param) {
2907 elems.wmm_param = bss_elems.wmm_param;
2908 sdata_info(sdata,
2909 "AP bug: WMM param missing from AssocResp\n");
2910 }
2911
2912 /*
2913 * Also check if we requested HT/VHT, otherwise the AP doesn't
2914 * have to include the IEs in the (re)association response.
2915 */
2916 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2917 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2918 elems.ht_cap_elem = bss_elems.ht_cap_elem;
2919 sdata_info(sdata,
2920 "AP bug: HT capability missing from AssocResp\n");
2921 }
2922 if (!elems.ht_operation && bss_elems.ht_operation &&
2923 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2924 elems.ht_operation = bss_elems.ht_operation;
2925 sdata_info(sdata,
2926 "AP bug: HT operation missing from AssocResp\n");
2927 }
2928 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2929 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2930 elems.vht_cap_elem = bss_elems.vht_cap_elem;
2931 sdata_info(sdata,
2932 "AP bug: VHT capa missing from AssocResp\n");
2933 }
2934 if (!elems.vht_operation && bss_elems.vht_operation &&
2935 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2936 elems.vht_operation = bss_elems.vht_operation;
2937 sdata_info(sdata,
2938 "AP bug: VHT operation missing from AssocResp\n");
2939 }
2940 }
2941
2942 /*
2943 * We previously checked these in the beacon/probe response, so
2944 * they should be present here. This is just a safety net.
2945 */
2946 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2947 (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2948 sdata_info(sdata,
2949 "HT AP is missing WMM params or HT capability/operation\n");
2950 ret = false;
2951 goto out;
2952 }
2953
2954 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2955 (!elems.vht_cap_elem || !elems.vht_operation)) {
2956 sdata_info(sdata,
2957 "VHT AP is missing VHT capability/operation\n");
2958 ret = false;
2959 goto out;
2960 }
2961
2962 mutex_lock(&sdata->local->sta_mtx);
2963 /*
2964 * station info was already allocated and inserted before
2965 * the association and should be available to us
2966 */
2967 sta = sta_info_get(sdata, cbss->bssid);
2968 if (WARN_ON(!sta)) {
2969 mutex_unlock(&sdata->local->sta_mtx);
2970 ret = false;
2971 goto out;
2972 }
2973
2974 sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2975
2976 /* Set up internal HT/VHT capabilities */
2977 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2978 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2979 elems.ht_cap_elem, sta);
2980
2981 if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
2982 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2983 elems.vht_cap_elem, sta);
2984
2985 /*
2986 * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
2987 * in their association response, so ignore that data for our own
2988 * configuration. If it changed since the last beacon, we'll get the
2989 * next beacon and update then.
2990 */
2991
2992 /*
2993 * If an operating mode notification IE is present, override the
2994 * NSS calculation (that would be done in rate_control_rate_init())
2995 * and use the # of streams from that element.
2996 */
2997 if (elems.opmode_notif &&
2998 !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
2999 u8 nss;
3000
3001 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
3002 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
3003 nss += 1;
3004 sta->sta.rx_nss = nss;
3005 }
3006
3007 rate_control_rate_init(sta);
3008
3009 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) {
3010 set_sta_flag(sta, WLAN_STA_MFP);
3011 sta->sta.mfp = true;
3012 } else {
3013 sta->sta.mfp = false;
3014 }
3015
3016 sta->sta.wme = elems.wmm_param && local->hw.queues >= IEEE80211_NUM_ACS;
3017
3018 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
3019 if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
3020 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
3021 if (err) {
3022 sdata_info(sdata,
3023 "failed to move station %pM to desired state\n",
3024 sta->sta.addr);
3025 WARN_ON(__sta_info_destroy(sta));
3026 mutex_unlock(&sdata->local->sta_mtx);
3027 ret = false;
3028 goto out;
3029 }
3030
3031 mutex_unlock(&sdata->local->sta_mtx);
3032
3033 /*
3034 * Always handle WMM once after association regardless
3035 * of the first value the AP uses. Setting -1 here has
3036 * that effect because the AP values is an unsigned
3037 * 4-bit value.
3038 */
3039 ifmgd->wmm_last_param_set = -1;
3040
3041 if (ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
3042 ieee80211_set_wmm_default(sdata, false, false);
3043 } else if (!ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3044 elems.wmm_param_len)) {
3045 /* still enable QoS since we might have HT/VHT */
3046 ieee80211_set_wmm_default(sdata, false, true);
3047 /* set the disable-WMM flag in this case to disable
3048 * tracking WMM parameter changes in the beacon if
3049 * the parameters weren't actually valid. Doing so
3050 * avoids changing parameters very strangely when
3051 * the AP is going back and forth between valid and
3052 * invalid parameters.
3053 */
3054 ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
3055 }
3056 changed |= BSS_CHANGED_QOS;
3057
3058 /* set AID and assoc capability,
3059 * ieee80211_set_associated() will tell the driver */
3060 bss_conf->aid = aid;
3061 bss_conf->assoc_capability = capab_info;
3062 ieee80211_set_associated(sdata, cbss, changed);
3063
3064 /*
3065 * If we're using 4-addr mode, let the AP know that we're
3066 * doing so, so that it can create the STA VLAN on its side
3067 */
3068 if (ifmgd->use_4addr)
3069 ieee80211_send_4addr_nullfunc(local, sdata);
3070
3071 /*
3072 * Start timer to probe the connection to the AP now.
3073 * Also start the timer that will detect beacon loss.
3074 */
3075 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
3076 ieee80211_sta_reset_beacon_monitor(sdata);
3077
3078 ret = true;
3079 out:
3080 kfree(bss_ies);
3081 return ret;
3082 }
3083
3084 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
3085 struct ieee80211_mgmt *mgmt,
3086 size_t len)
3087 {
3088 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3089 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
3090 u16 capab_info, status_code, aid;
3091 struct ieee802_11_elems elems;
3092 int ac, uapsd_queues = -1;
3093 u8 *pos;
3094 bool reassoc;
3095 struct cfg80211_bss *bss;
3096 struct ieee80211_event event = {
3097 .type = MLME_EVENT,
3098 .u.mlme.data = ASSOC_EVENT,
3099 };
3100
3101 sdata_assert_lock(sdata);
3102
3103 if (!assoc_data)
3104 return;
3105 if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3106 return;
3107
3108 /*
3109 * AssocResp and ReassocResp have identical structure, so process both
3110 * of them in this function.
3111 */
3112
3113 if (len < 24 + 6)
3114 return;
3115
3116 reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
3117 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
3118 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
3119 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
3120
3121 sdata_info(sdata,
3122 "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
3123 reassoc ? "Rea" : "A", mgmt->sa,
3124 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
3125
3126 pos = mgmt->u.assoc_resp.variable;
3127 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
3128
3129 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3130 elems.timeout_int &&
3131 elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
3132 u32 tu, ms;
3133 tu = le32_to_cpu(elems.timeout_int->value);
3134 ms = tu * 1024 / 1000;
3135 sdata_info(sdata,
3136 "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
3137 mgmt->sa, tu, ms);
3138 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3139 assoc_data->timeout_started = true;
3140 if (ms > IEEE80211_ASSOC_TIMEOUT)
3141 run_again(sdata, assoc_data->timeout);
3142 return;
3143 }
3144
3145 bss = assoc_data->bss;
3146
3147 if (status_code != WLAN_STATUS_SUCCESS) {
3148 sdata_info(sdata, "%pM denied association (code=%d)\n",
3149 mgmt->sa, status_code);
3150 ieee80211_destroy_assoc_data(sdata, false);
3151 event.u.mlme.status = MLME_DENIED;
3152 event.u.mlme.reason = status_code;
3153 drv_event_callback(sdata->local, sdata, &event);
3154 } else {
3155 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
3156 /* oops -- internal error -- send timeout for now */
3157 ieee80211_destroy_assoc_data(sdata, false);
3158 cfg80211_assoc_timeout(sdata->dev, bss);
3159 return;
3160 }
3161 event.u.mlme.status = MLME_SUCCESS;
3162 drv_event_callback(sdata->local, sdata, &event);
3163 sdata_info(sdata, "associated\n");
3164
3165 /*
3166 * destroy assoc_data afterwards, as otherwise an idle
3167 * recalc after assoc_data is NULL but before associated
3168 * is set can cause the interface to go idle
3169 */
3170 ieee80211_destroy_assoc_data(sdata, true);
3171
3172 /* get uapsd queues configuration */
3173 uapsd_queues = 0;
3174 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
3175 if (sdata->tx_conf[ac].uapsd)
3176 uapsd_queues |= BIT(ac);
3177 }
3178
3179 cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
3180 }
3181
3182 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
3183 struct ieee80211_mgmt *mgmt, size_t len,
3184 struct ieee80211_rx_status *rx_status,
3185 struct ieee802_11_elems *elems)
3186 {
3187 struct ieee80211_local *local = sdata->local;
3188 struct ieee80211_bss *bss;
3189 struct ieee80211_channel *channel;
3190
3191 sdata_assert_lock(sdata);
3192
3193 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
3194 if (!channel)
3195 return;
3196
3197 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3198 channel);
3199 if (bss) {
3200 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3201 ieee80211_rx_bss_put(local, bss);
3202 }
3203 }
3204
3205
3206 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
3207 struct sk_buff *skb)
3208 {
3209 struct ieee80211_mgmt *mgmt = (void *)skb->data;
3210 struct ieee80211_if_managed *ifmgd;
3211 struct ieee80211_rx_status *rx_status = (void *) skb->cb;
3212 size_t baselen, len = skb->len;
3213 struct ieee802_11_elems elems;
3214
3215 ifmgd = &sdata->u.mgd;
3216
3217 sdata_assert_lock(sdata);
3218
3219 if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3220 return; /* ignore ProbeResp to foreign address */
3221
3222 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
3223 if (baselen > len)
3224 return;
3225
3226 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3227 false, &elems);
3228
3229 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3230
3231 if (ifmgd->associated &&
3232 ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3233 ieee80211_reset_ap_probe(sdata);
3234 }
3235
3236 /*
3237 * This is the canonical list of information elements we care about,
3238 * the filter code also gives us all changes to the Microsoft OUI
3239 * (00:50:F2) vendor IE which is used for WMM which we need to track,
3240 * as well as the DTPC IE (part of the Cisco OUI) used for signaling
3241 * changes to requested client power.
3242 *
3243 * We implement beacon filtering in software since that means we can
3244 * avoid processing the frame here and in cfg80211, and userspace
3245 * will not be able to tell whether the hardware supports it or not.
3246 *
3247 * XXX: This list needs to be dynamic -- userspace needs to be able to
3248 * add items it requires. It also needs to be able to tell us to
3249 * look out for other vendor IEs.
3250 */
3251 static const u64 care_about_ies =
3252 (1ULL << WLAN_EID_COUNTRY) |
3253 (1ULL << WLAN_EID_ERP_INFO) |
3254 (1ULL << WLAN_EID_CHANNEL_SWITCH) |
3255 (1ULL << WLAN_EID_PWR_CONSTRAINT) |
3256 (1ULL << WLAN_EID_HT_CAPABILITY) |
3257 (1ULL << WLAN_EID_HT_OPERATION) |
3258 (1ULL << WLAN_EID_EXT_CHANSWITCH_ANN);
3259
3260 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
3261 struct ieee80211_mgmt *mgmt, size_t len,
3262 struct ieee80211_rx_status *rx_status)
3263 {
3264 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3265 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3266 size_t baselen;
3267 struct ieee802_11_elems elems;
3268 struct ieee80211_local *local = sdata->local;
3269 struct ieee80211_chanctx_conf *chanctx_conf;
3270 struct ieee80211_channel *chan;
3271 struct sta_info *sta;
3272 u32 changed = 0;
3273 bool erp_valid;
3274 u8 erp_value = 0;
3275 u32 ncrc;
3276 u8 *bssid;
3277 u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3278
3279 sdata_assert_lock(sdata);
3280
3281 /* Process beacon from the current BSS */
3282 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
3283 if (baselen > len)
3284 return;
3285
3286 rcu_read_lock();
3287 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3288 if (!chanctx_conf) {
3289 rcu_read_unlock();
3290 return;
3291 }
3292
3293 if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
3294 rcu_read_unlock();
3295 return;
3296 }
3297 chan = chanctx_conf->def.chan;
3298 rcu_read_unlock();
3299
3300 if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3301 ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
3302 ieee802_11_parse_elems(mgmt->u.beacon.variable,
3303 len - baselen, false, &elems);
3304
3305 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3306 if (elems.tim && !elems.parse_error) {
3307 const struct ieee80211_tim_ie *tim_ie = elems.tim;
3308 ifmgd->dtim_period = tim_ie->dtim_period;
3309 }
3310 ifmgd->have_beacon = true;
3311 ifmgd->assoc_data->need_beacon = false;
3312 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3313 sdata->vif.bss_conf.sync_tsf =
3314 le64_to_cpu(mgmt->u.beacon.timestamp);
3315 sdata->vif.bss_conf.sync_device_ts =
3316 rx_status->device_timestamp;
3317 if (elems.tim)
3318 sdata->vif.bss_conf.sync_dtim_count =
3319 elems.tim->dtim_count;
3320 else
3321 sdata->vif.bss_conf.sync_dtim_count = 0;
3322 }
3323 /* continue assoc process */
3324 ifmgd->assoc_data->timeout = jiffies;
3325 ifmgd->assoc_data->timeout_started = true;
3326 run_again(sdata, ifmgd->assoc_data->timeout);
3327 return;
3328 }
3329
3330 if (!ifmgd->associated ||
3331 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3332 return;
3333 bssid = ifmgd->associated->bssid;
3334
3335 /* Track average RSSI from the Beacon frames of the current AP */
3336 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
3337 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3338 ewma_beacon_signal_init(&ifmgd->ave_beacon_signal);
3339 ifmgd->last_cqm_event_signal = 0;
3340 ifmgd->count_beacon_signal = 1;
3341 ifmgd->last_ave_beacon_signal = 0;
3342 } else {
3343 ifmgd->count_beacon_signal++;
3344 }
3345
3346 ewma_beacon_signal_add(&ifmgd->ave_beacon_signal, -rx_status->signal);
3347
3348 if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3349 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3350 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3351 int last_sig = ifmgd->last_ave_beacon_signal;
3352 struct ieee80211_event event = {
3353 .type = RSSI_EVENT,
3354 };
3355
3356 /*
3357 * if signal crosses either of the boundaries, invoke callback
3358 * with appropriate parameters
3359 */
3360 if (sig > ifmgd->rssi_max_thold &&
3361 (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3362 ifmgd->last_ave_beacon_signal = sig;
3363 event.u.rssi.data = RSSI_EVENT_HIGH;
3364 drv_event_callback(local, sdata, &event);
3365 } else if (sig < ifmgd->rssi_min_thold &&
3366 (last_sig >= ifmgd->rssi_max_thold ||
3367 last_sig == 0)) {
3368 ifmgd->last_ave_beacon_signal = sig;
3369 event.u.rssi.data = RSSI_EVENT_LOW;
3370 drv_event_callback(local, sdata, &event);
3371 }
3372 }
3373
3374 if (bss_conf->cqm_rssi_thold &&
3375 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3376 !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3377 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3378 int last_event = ifmgd->last_cqm_event_signal;
3379 int thold = bss_conf->cqm_rssi_thold;
3380 int hyst = bss_conf->cqm_rssi_hyst;
3381
3382 if (sig < thold &&
3383 (last_event == 0 || sig < last_event - hyst)) {
3384 ifmgd->last_cqm_event_signal = sig;
3385 ieee80211_cqm_rssi_notify(
3386 &sdata->vif,
3387 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3388 GFP_KERNEL);
3389 } else if (sig > thold &&
3390 (last_event == 0 || sig > last_event + hyst)) {
3391 ifmgd->last_cqm_event_signal = sig;
3392 ieee80211_cqm_rssi_notify(
3393 &sdata->vif,
3394 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3395 GFP_KERNEL);
3396 }
3397 }
3398
3399 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3400 mlme_dbg_ratelimited(sdata,
3401 "cancelling AP probe due to a received beacon\n");
3402 ieee80211_reset_ap_probe(sdata);
3403 }
3404
3405 /*
3406 * Push the beacon loss detection into the future since
3407 * we are processing a beacon from the AP just now.
3408 */
3409 ieee80211_sta_reset_beacon_monitor(sdata);
3410
3411 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3412 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3413 len - baselen, false, &elems,
3414 care_about_ies, ncrc);
3415
3416 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
3417 ieee80211_check_tim(elems.tim, elems.tim_len, ifmgd->aid)) {
3418 if (local->hw.conf.dynamic_ps_timeout > 0) {
3419 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3420 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3421 ieee80211_hw_config(local,
3422 IEEE80211_CONF_CHANGE_PS);
3423 }
3424 ieee80211_send_nullfunc(local, sdata, false);
3425 } else if (!local->pspolling && sdata->u.mgd.powersave) {
3426 local->pspolling = true;
3427
3428 /*
3429 * Here is assumed that the driver will be
3430 * able to send ps-poll frame and receive a
3431 * response even though power save mode is
3432 * enabled, but some drivers might require
3433 * to disable power save here. This needs
3434 * to be investigated.
3435 */
3436 ieee80211_send_pspoll(local, sdata);
3437 }
3438 }
3439
3440 if (sdata->vif.p2p ||
3441 sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) {
3442 struct ieee80211_p2p_noa_attr noa = {};
3443 int ret;
3444
3445 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3446 len - baselen,
3447 IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3448 (u8 *) &noa, sizeof(noa));
3449 if (ret >= 2) {
3450 if (sdata->u.mgd.p2p_noa_index != noa.index) {
3451 /* valid noa_attr and index changed */
3452 sdata->u.mgd.p2p_noa_index = noa.index;
3453 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3454 changed |= BSS_CHANGED_P2P_PS;
3455 /*
3456 * make sure we update all information, the CRC
3457 * mechanism doesn't look at P2P attributes.
3458 */
3459 ifmgd->beacon_crc_valid = false;
3460 }
3461 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3462 /* noa_attr not found and we had valid noa_attr before */
3463 sdata->u.mgd.p2p_noa_index = -1;
3464 memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3465 changed |= BSS_CHANGED_P2P_PS;
3466 ifmgd->beacon_crc_valid = false;
3467 }
3468 }
3469
3470 if (ifmgd->csa_waiting_bcn)
3471 ieee80211_chswitch_post_beacon(sdata);
3472
3473 /*
3474 * Update beacon timing and dtim count on every beacon appearance. This
3475 * will allow the driver to use the most updated values. Do it before
3476 * comparing this one with last received beacon.
3477 * IMPORTANT: These parameters would possibly be out of sync by the time
3478 * the driver will use them. The synchronized view is currently
3479 * guaranteed only in certain callbacks.
3480 */
3481 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3482 sdata->vif.bss_conf.sync_tsf =
3483 le64_to_cpu(mgmt->u.beacon.timestamp);
3484 sdata->vif.bss_conf.sync_device_ts =
3485 rx_status->device_timestamp;
3486 if (elems.tim)
3487 sdata->vif.bss_conf.sync_dtim_count =
3488 elems.tim->dtim_count;
3489 else
3490 sdata->vif.bss_conf.sync_dtim_count = 0;
3491 }
3492
3493 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3494 return;
3495 ifmgd->beacon_crc = ncrc;
3496 ifmgd->beacon_crc_valid = true;
3497
3498 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3499
3500 ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3501 rx_status->device_timestamp,
3502 &elems, true);
3503
3504 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3505 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3506 elems.wmm_param_len))
3507 changed |= BSS_CHANGED_QOS;
3508
3509 /*
3510 * If we haven't had a beacon before, tell the driver about the
3511 * DTIM period (and beacon timing if desired) now.
3512 */
3513 if (!ifmgd->have_beacon) {
3514 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3515 if (elems.tim)
3516 bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3517 else
3518 bss_conf->dtim_period = 1;
3519
3520 changed |= BSS_CHANGED_BEACON_INFO;
3521 ifmgd->have_beacon = true;
3522
3523 mutex_lock(&local->iflist_mtx);
3524 ieee80211_recalc_ps(local);
3525 mutex_unlock(&local->iflist_mtx);
3526
3527 ieee80211_recalc_ps_vif(sdata);
3528 }
3529
3530 if (elems.erp_info) {
3531 erp_valid = true;
3532 erp_value = elems.erp_info[0];
3533 } else {
3534 erp_valid = false;
3535 }
3536 changed |= ieee80211_handle_bss_capability(sdata,
3537 le16_to_cpu(mgmt->u.beacon.capab_info),
3538 erp_valid, erp_value);
3539
3540 mutex_lock(&local->sta_mtx);
3541 sta = sta_info_get(sdata, bssid);
3542
3543 if (ieee80211_config_bw(sdata, sta,
3544 elems.ht_cap_elem, elems.ht_operation,
3545 elems.vht_operation, bssid, &changed)) {
3546 mutex_unlock(&local->sta_mtx);
3547 sdata_info(sdata,
3548 "failed to follow AP %pM bandwidth change, disconnect\n",
3549 bssid);
3550 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3551 WLAN_REASON_DEAUTH_LEAVING,
3552 true, deauth_buf);
3553 ieee80211_report_disconnect(sdata, deauth_buf,
3554 sizeof(deauth_buf), true,
3555 WLAN_REASON_DEAUTH_LEAVING);
3556 return;
3557 }
3558
3559 if (sta && elems.opmode_notif)
3560 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3561 rx_status->band);
3562 mutex_unlock(&local->sta_mtx);
3563
3564 changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
3565 elems.country_elem,
3566 elems.country_elem_len,
3567 elems.pwr_constr_elem,
3568 elems.cisco_dtpc_elem);
3569
3570 ieee80211_bss_info_change_notify(sdata, changed);
3571 }
3572
3573 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3574 struct sk_buff *skb)
3575 {
3576 struct ieee80211_rx_status *rx_status;
3577 struct ieee80211_mgmt *mgmt;
3578 u16 fc;
3579 struct ieee802_11_elems elems;
3580 int ies_len;
3581
3582 rx_status = (struct ieee80211_rx_status *) skb->cb;
3583 mgmt = (struct ieee80211_mgmt *) skb->data;
3584 fc = le16_to_cpu(mgmt->frame_control);
3585
3586 sdata_lock(sdata);
3587
3588 switch (fc & IEEE80211_FCTL_STYPE) {
3589 case IEEE80211_STYPE_BEACON:
3590 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3591 break;
3592 case IEEE80211_STYPE_PROBE_RESP:
3593 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3594 break;
3595 case IEEE80211_STYPE_AUTH:
3596 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3597 break;
3598 case IEEE80211_STYPE_DEAUTH:
3599 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3600 break;
3601 case IEEE80211_STYPE_DISASSOC:
3602 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3603 break;
3604 case IEEE80211_STYPE_ASSOC_RESP:
3605 case IEEE80211_STYPE_REASSOC_RESP:
3606 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3607 break;
3608 case IEEE80211_STYPE_ACTION:
3609 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3610 ies_len = skb->len -
3611 offsetof(struct ieee80211_mgmt,
3612 u.action.u.chan_switch.variable);
3613
3614 if (ies_len < 0)
3615 break;
3616
3617 ieee802_11_parse_elems(
3618 mgmt->u.action.u.chan_switch.variable,
3619 ies_len, true, &elems);
3620
3621 if (elems.parse_error)
3622 break;
3623
3624 ieee80211_sta_process_chanswitch(sdata,
3625 rx_status->mactime,
3626 rx_status->device_timestamp,
3627 &elems, false);
3628 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3629 ies_len = skb->len -
3630 offsetof(struct ieee80211_mgmt,
3631 u.action.u.ext_chan_switch.variable);
3632
3633 if (ies_len < 0)
3634 break;
3635
3636 ieee802_11_parse_elems(
3637 mgmt->u.action.u.ext_chan_switch.variable,
3638 ies_len, true, &elems);
3639
3640 if (elems.parse_error)
3641 break;
3642
3643 /* for the handling code pretend this was also an IE */
3644 elems.ext_chansw_ie =
3645 &mgmt->u.action.u.ext_chan_switch.data;
3646
3647 ieee80211_sta_process_chanswitch(sdata,
3648 rx_status->mactime,
3649 rx_status->device_timestamp,
3650 &elems, false);
3651 }
3652 break;
3653 }
3654 sdata_unlock(sdata);
3655 }
3656
3657 static void ieee80211_sta_timer(unsigned long data)
3658 {
3659 struct ieee80211_sub_if_data *sdata =
3660 (struct ieee80211_sub_if_data *) data;
3661
3662 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3663 }
3664
3665 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3666 u8 *bssid, u8 reason, bool tx)
3667 {
3668 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3669
3670 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3671 tx, frame_buf);
3672
3673 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
3674 reason);
3675 }
3676
3677 static int ieee80211_auth(struct ieee80211_sub_if_data *sdata)
3678 {
3679 struct ieee80211_local *local = sdata->local;
3680 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3681 struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3682 u32 tx_flags = 0;
3683 u16 trans = 1;
3684 u16 status = 0;
3685
3686 sdata_assert_lock(sdata);
3687
3688 if (WARN_ON_ONCE(!auth_data))
3689 return -EINVAL;
3690
3691 auth_data->tries++;
3692
3693 if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3694 sdata_info(sdata, "authentication with %pM timed out\n",
3695 auth_data->bss->bssid);
3696
3697 /*
3698 * Most likely AP is not in the range so remove the
3699 * bss struct for that AP.
3700 */
3701 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3702
3703 return -ETIMEDOUT;
3704 }
3705
3706 drv_mgd_prepare_tx(local, sdata);
3707
3708 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3709 auth_data->bss->bssid, auth_data->tries,
3710 IEEE80211_AUTH_MAX_TRIES);
3711
3712 auth_data->expected_transaction = 2;
3713
3714 if (auth_data->algorithm == WLAN_AUTH_SAE) {
3715 trans = auth_data->sae_trans;
3716 status = auth_data->sae_status;
3717 auth_data->expected_transaction = trans;
3718 }
3719
3720 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3721 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3722 IEEE80211_TX_INTFL_MLME_CONN_TX;
3723
3724 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3725 auth_data->data, auth_data->data_len,
3726 auth_data->bss->bssid,
3727 auth_data->bss->bssid, NULL, 0, 0,
3728 tx_flags);
3729
3730 if (tx_flags == 0) {
3731 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3732 auth_data->timeout_started = true;
3733 run_again(sdata, auth_data->timeout);
3734 } else {
3735 auth_data->timeout =
3736 round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3737 auth_data->timeout_started = true;
3738 run_again(sdata, auth_data->timeout);
3739 }
3740
3741 return 0;
3742 }
3743
3744 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3745 {
3746 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3747 struct ieee80211_local *local = sdata->local;
3748
3749 sdata_assert_lock(sdata);
3750
3751 assoc_data->tries++;
3752 if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3753 sdata_info(sdata, "association with %pM timed out\n",
3754 assoc_data->bss->bssid);
3755
3756 /*
3757 * Most likely AP is not in the range so remove the
3758 * bss struct for that AP.
3759 */
3760 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3761
3762 return -ETIMEDOUT;
3763 }
3764
3765 sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3766 assoc_data->bss->bssid, assoc_data->tries,
3767 IEEE80211_ASSOC_MAX_TRIES);
3768 ieee80211_send_assoc(sdata);
3769
3770 if (!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3771 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3772 assoc_data->timeout_started = true;
3773 run_again(sdata, assoc_data->timeout);
3774 } else {
3775 assoc_data->timeout =
3776 round_jiffies_up(jiffies +
3777 IEEE80211_ASSOC_TIMEOUT_LONG);
3778 assoc_data->timeout_started = true;
3779 run_again(sdata, assoc_data->timeout);
3780 }
3781
3782 return 0;
3783 }
3784
3785 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3786 __le16 fc, bool acked)
3787 {
3788 struct ieee80211_local *local = sdata->local;
3789
3790 sdata->u.mgd.status_fc = fc;
3791 sdata->u.mgd.status_acked = acked;
3792 sdata->u.mgd.status_received = true;
3793
3794 ieee80211_queue_work(&local->hw, &sdata->work);
3795 }
3796
3797 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3798 {
3799 struct ieee80211_local *local = sdata->local;
3800 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3801
3802 sdata_lock(sdata);
3803
3804 if (ifmgd->status_received) {
3805 __le16 fc = ifmgd->status_fc;
3806 bool status_acked = ifmgd->status_acked;
3807
3808 ifmgd->status_received = false;
3809 if (ifmgd->auth_data && ieee80211_is_auth(fc)) {
3810 if (status_acked) {
3811 ifmgd->auth_data->timeout =
3812 jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3813 run_again(sdata, ifmgd->auth_data->timeout);
3814 } else {
3815 ifmgd->auth_data->timeout = jiffies - 1;
3816 }
3817 ifmgd->auth_data->timeout_started = true;
3818 } else if (ifmgd->assoc_data &&
3819 (ieee80211_is_assoc_req(fc) ||
3820 ieee80211_is_reassoc_req(fc))) {
3821 if (status_acked) {
3822 ifmgd->assoc_data->timeout =
3823 jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3824 run_again(sdata, ifmgd->assoc_data->timeout);
3825 } else {
3826 ifmgd->assoc_data->timeout = jiffies - 1;
3827 }
3828 ifmgd->assoc_data->timeout_started = true;
3829 }
3830 }
3831
3832 if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3833 time_after(jiffies, ifmgd->auth_data->timeout)) {
3834 if (ifmgd->auth_data->done) {
3835 /*
3836 * ok ... we waited for assoc but userspace didn't,
3837 * so let's just kill the auth data
3838 */
3839 ieee80211_destroy_auth_data(sdata, false);
3840 } else if (ieee80211_auth(sdata)) {
3841 u8 bssid[ETH_ALEN];
3842 struct ieee80211_event event = {
3843 .type = MLME_EVENT,
3844 .u.mlme.data = AUTH_EVENT,
3845 .u.mlme.status = MLME_TIMEOUT,
3846 };
3847
3848 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3849
3850 ieee80211_destroy_auth_data(sdata, false);
3851
3852 cfg80211_auth_timeout(sdata->dev, bssid);
3853 drv_event_callback(sdata->local, sdata, &event);
3854 }
3855 } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3856 run_again(sdata, ifmgd->auth_data->timeout);
3857
3858 if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3859 time_after(jiffies, ifmgd->assoc_data->timeout)) {
3860 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3861 ieee80211_do_assoc(sdata)) {
3862 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3863 struct ieee80211_event event = {
3864 .type = MLME_EVENT,
3865 .u.mlme.data = ASSOC_EVENT,
3866 .u.mlme.status = MLME_TIMEOUT,
3867 };
3868
3869 ieee80211_destroy_assoc_data(sdata, false);
3870 cfg80211_assoc_timeout(sdata->dev, bss);
3871 drv_event_callback(sdata->local, sdata, &event);
3872 }
3873 } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3874 run_again(sdata, ifmgd->assoc_data->timeout);
3875
3876 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3877 ifmgd->associated) {
3878 u8 bssid[ETH_ALEN];
3879 int max_tries;
3880
3881 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3882
3883 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3884 max_tries = max_nullfunc_tries;
3885 else
3886 max_tries = max_probe_tries;
3887
3888 /* ACK received for nullfunc probing frame */
3889 if (!ifmgd->probe_send_count)
3890 ieee80211_reset_ap_probe(sdata);
3891 else if (ifmgd->nullfunc_failed) {
3892 if (ifmgd->probe_send_count < max_tries) {
3893 mlme_dbg(sdata,
3894 "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3895 bssid, ifmgd->probe_send_count,
3896 max_tries);
3897 ieee80211_mgd_probe_ap_send(sdata);
3898 } else {
3899 mlme_dbg(sdata,
3900 "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3901 bssid);
3902 ieee80211_sta_connection_lost(sdata, bssid,
3903 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3904 false);
3905 }
3906 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3907 run_again(sdata, ifmgd->probe_timeout);
3908 else if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3909 mlme_dbg(sdata,
3910 "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3911 bssid, probe_wait_ms);
3912 ieee80211_sta_connection_lost(sdata, bssid,
3913 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3914 } else if (ifmgd->probe_send_count < max_tries) {
3915 mlme_dbg(sdata,
3916 "No probe response from AP %pM after %dms, try %d/%i\n",
3917 bssid, probe_wait_ms,
3918 ifmgd->probe_send_count, max_tries);
3919 ieee80211_mgd_probe_ap_send(sdata);
3920 } else {
3921 /*
3922 * We actually lost the connection ... or did we?
3923 * Let's make sure!
3924 */
3925 mlme_dbg(sdata,
3926 "No probe response from AP %pM after %dms, disconnecting.\n",
3927 bssid, probe_wait_ms);
3928
3929 ieee80211_sta_connection_lost(sdata, bssid,
3930 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3931 }
3932 }
3933
3934 sdata_unlock(sdata);
3935 }
3936
3937 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3938 {
3939 struct ieee80211_sub_if_data *sdata =
3940 (struct ieee80211_sub_if_data *) data;
3941 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3942
3943 if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3944 return;
3945
3946 sdata->u.mgd.connection_loss = false;
3947 ieee80211_queue_work(&sdata->local->hw,
3948 &sdata->u.mgd.beacon_connection_loss_work);
3949 }
3950
3951 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3952 {
3953 struct ieee80211_sub_if_data *sdata =
3954 (struct ieee80211_sub_if_data *) data;
3955 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3956 struct ieee80211_local *local = sdata->local;
3957
3958 if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3959 return;
3960
3961 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3962 }
3963
3964 static void ieee80211_sta_monitor_work(struct work_struct *work)
3965 {
3966 struct ieee80211_sub_if_data *sdata =
3967 container_of(work, struct ieee80211_sub_if_data,
3968 u.mgd.monitor_work);
3969
3970 ieee80211_mgd_probe_ap(sdata, false);
3971 }
3972
3973 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3974 {
3975 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3976 __ieee80211_stop_poll(sdata);
3977
3978 /* let's probe the connection once */
3979 if (!ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
3980 ieee80211_queue_work(&sdata->local->hw,
3981 &sdata->u.mgd.monitor_work);
3982 /* and do all the other regular work too */
3983 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3984 }
3985 }
3986
3987 #ifdef CONFIG_PM
3988 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
3989 {
3990 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3991 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3992
3993 sdata_lock(sdata);
3994
3995 if (ifmgd->auth_data || ifmgd->assoc_data) {
3996 const u8 *bssid = ifmgd->auth_data ?
3997 ifmgd->auth_data->bss->bssid :
3998 ifmgd->assoc_data->bss->bssid;
3999
4000 /*
4001 * If we are trying to authenticate / associate while suspending,
4002 * cfg80211 won't know and won't actually abort those attempts,
4003 * thus we need to do that ourselves.
4004 */
4005 ieee80211_send_deauth_disassoc(sdata, bssid,
4006 IEEE80211_STYPE_DEAUTH,
4007 WLAN_REASON_DEAUTH_LEAVING,
4008 false, frame_buf);
4009 if (ifmgd->assoc_data)
4010 ieee80211_destroy_assoc_data(sdata, false);
4011 if (ifmgd->auth_data)
4012 ieee80211_destroy_auth_data(sdata, false);
4013 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4014 IEEE80211_DEAUTH_FRAME_LEN);
4015 }
4016
4017 /* This is a bit of a hack - we should find a better and more generic
4018 * solution to this. Normally when suspending, cfg80211 will in fact
4019 * deauthenticate. However, it doesn't (and cannot) stop an ongoing
4020 * auth (not so important) or assoc (this is the problem) process.
4021 *
4022 * As a consequence, it can happen that we are in the process of both
4023 * associating and suspending, and receive an association response
4024 * after cfg80211 has checked if it needs to disconnect, but before
4025 * we actually set the flag to drop incoming frames. This will then
4026 * cause the workqueue flush to process the association response in
4027 * the suspend, resulting in a successful association just before it
4028 * tries to remove the interface from the driver, which now though
4029 * has a channel context assigned ... this results in issues.
4030 *
4031 * To work around this (for now) simply deauth here again if we're
4032 * now connected.
4033 */
4034 if (ifmgd->associated && !sdata->local->wowlan) {
4035 u8 bssid[ETH_ALEN];
4036 struct cfg80211_deauth_request req = {
4037 .reason_code = WLAN_REASON_DEAUTH_LEAVING,
4038 .bssid = bssid,
4039 };
4040
4041 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
4042 ieee80211_mgd_deauth(sdata, &req);
4043 }
4044
4045 sdata_unlock(sdata);
4046 }
4047
4048 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
4049 {
4050 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4051
4052 sdata_lock(sdata);
4053 if (!ifmgd->associated) {
4054 sdata_unlock(sdata);
4055 return;
4056 }
4057
4058 if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
4059 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
4060 mlme_dbg(sdata, "driver requested disconnect after resume\n");
4061 ieee80211_sta_connection_lost(sdata,
4062 ifmgd->associated->bssid,
4063 WLAN_REASON_UNSPECIFIED,
4064 true);
4065 sdata_unlock(sdata);
4066 return;
4067 }
4068 sdata_unlock(sdata);
4069 }
4070 #endif
4071
4072 /* interface setup */
4073 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
4074 {
4075 struct ieee80211_if_managed *ifmgd;
4076
4077 ifmgd = &sdata->u.mgd;
4078 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
4079 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
4080 INIT_WORK(&ifmgd->beacon_connection_loss_work,
4081 ieee80211_beacon_connection_loss_work);
4082 INIT_WORK(&ifmgd->csa_connection_drop_work,
4083 ieee80211_csa_connection_drop_work);
4084 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
4085 INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
4086 ieee80211_tdls_peer_del_work);
4087 setup_timer(&ifmgd->timer, ieee80211_sta_timer,
4088 (unsigned long) sdata);
4089 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
4090 (unsigned long) sdata);
4091 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
4092 (unsigned long) sdata);
4093 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
4094 (unsigned long) sdata);
4095 INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
4096 ieee80211_sta_handle_tspec_ac_params_wk);
4097
4098 ifmgd->flags = 0;
4099 ifmgd->powersave = sdata->wdev.ps;
4100 ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
4101 ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
4102 ifmgd->p2p_noa_index = -1;
4103
4104 if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4105 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
4106 else
4107 ifmgd->req_smps = IEEE80211_SMPS_OFF;
4108
4109 /* Setup TDLS data */
4110 spin_lock_init(&ifmgd->teardown_lock);
4111 ifmgd->teardown_skb = NULL;
4112 ifmgd->orig_teardown_skb = NULL;
4113 }
4114
4115 /* scan finished notification */
4116 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
4117 {
4118 struct ieee80211_sub_if_data *sdata;
4119
4120 /* Restart STA timers */
4121 rcu_read_lock();
4122 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4123 if (ieee80211_sdata_running(sdata))
4124 ieee80211_restart_sta_timer(sdata);
4125 }
4126 rcu_read_unlock();
4127 }
4128
4129 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
4130 struct cfg80211_bss *cbss)
4131 {
4132 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4133 const u8 *ht_cap_ie, *vht_cap_ie;
4134 const struct ieee80211_ht_cap *ht_cap;
4135 const struct ieee80211_vht_cap *vht_cap;
4136 u8 chains = 1;
4137
4138 if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
4139 return chains;
4140
4141 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4142 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
4143 ht_cap = (void *)(ht_cap_ie + 2);
4144 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
4145 /*
4146 * TODO: use "Tx Maximum Number Spatial Streams Supported" and
4147 * "Tx Unequal Modulation Supported" fields.
4148 */
4149 }
4150
4151 if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
4152 return chains;
4153
4154 vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4155 if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
4156 u8 nss;
4157 u16 tx_mcs_map;
4158
4159 vht_cap = (void *)(vht_cap_ie + 2);
4160 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
4161 for (nss = 8; nss > 0; nss--) {
4162 if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
4163 IEEE80211_VHT_MCS_NOT_SUPPORTED)
4164 break;
4165 }
4166 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
4167 chains = max(chains, nss);
4168 }
4169
4170 return chains;
4171 }
4172
4173 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
4174 struct cfg80211_bss *cbss)
4175 {
4176 struct ieee80211_local *local = sdata->local;
4177 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4178 const struct ieee80211_ht_cap *ht_cap = NULL;
4179 const struct ieee80211_ht_operation *ht_oper = NULL;
4180 const struct ieee80211_vht_operation *vht_oper = NULL;
4181 struct ieee80211_supported_band *sband;
4182 struct cfg80211_chan_def chandef;
4183 int ret;
4184 u32 i;
4185 bool have_80mhz;
4186
4187 sband = local->hw.wiphy->bands[cbss->channel->band];
4188
4189 ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
4190 IEEE80211_STA_DISABLE_80P80MHZ |
4191 IEEE80211_STA_DISABLE_160MHZ);
4192
4193 rcu_read_lock();
4194
4195 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
4196 sband->ht_cap.ht_supported) {
4197 const u8 *ht_oper_ie, *ht_cap_ie;
4198
4199 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4200 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
4201 ht_oper = (void *)(ht_oper_ie + 2);
4202
4203 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4204 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
4205 ht_cap = (void *)(ht_cap_ie + 2);
4206
4207 if (!ht_cap) {
4208 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4209 ht_oper = NULL;
4210 }
4211 }
4212
4213 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4214 sband->vht_cap.vht_supported) {
4215 const u8 *vht_oper_ie, *vht_cap;
4216
4217 vht_oper_ie = ieee80211_bss_get_ie(cbss,
4218 WLAN_EID_VHT_OPERATION);
4219 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
4220 vht_oper = (void *)(vht_oper_ie + 2);
4221 if (vht_oper && !ht_oper) {
4222 vht_oper = NULL;
4223 sdata_info(sdata,
4224 "AP advertised VHT without HT, disabling both\n");
4225 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4226 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4227 }
4228
4229 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4230 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
4231 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4232 vht_oper = NULL;
4233 }
4234 }
4235
4236 /* Allow VHT if at least one channel on the sband supports 80 MHz */
4237 have_80mhz = false;
4238 for (i = 0; i < sband->n_channels; i++) {
4239 if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
4240 IEEE80211_CHAN_NO_80MHZ))
4241 continue;
4242
4243 have_80mhz = true;
4244 break;
4245 }
4246
4247 if (!have_80mhz)
4248 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4249
4250 ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
4251 cbss->channel,
4252 ht_cap, ht_oper, vht_oper,
4253 &chandef, false);
4254
4255 sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
4256 local->rx_chains);
4257
4258 rcu_read_unlock();
4259
4260 /* will change later if needed */
4261 sdata->smps_mode = IEEE80211_SMPS_OFF;
4262
4263 mutex_lock(&local->mtx);
4264 /*
4265 * If this fails (possibly due to channel context sharing
4266 * on incompatible channels, e.g. 80+80 and 160 sharing the
4267 * same control channel) try to use a smaller bandwidth.
4268 */
4269 ret = ieee80211_vif_use_channel(sdata, &chandef,
4270 IEEE80211_CHANCTX_SHARED);
4271
4272 /* don't downgrade for 5 and 10 MHz channels, though. */
4273 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
4274 chandef.width == NL80211_CHAN_WIDTH_10)
4275 goto out;
4276
4277 while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4278 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4279 ret = ieee80211_vif_use_channel(sdata, &chandef,
4280 IEEE80211_CHANCTX_SHARED);
4281 }
4282 out:
4283 mutex_unlock(&local->mtx);
4284 return ret;
4285 }
4286
4287 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4288 struct cfg80211_bss *cbss, bool assoc,
4289 bool override)
4290 {
4291 struct ieee80211_local *local = sdata->local;
4292 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4293 struct ieee80211_bss *bss = (void *)cbss->priv;
4294 struct sta_info *new_sta = NULL;
4295 struct ieee80211_supported_band *sband;
4296 bool have_sta = false;
4297 int err;
4298
4299 sband = local->hw.wiphy->bands[cbss->channel->band];
4300
4301 if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
4302 return -EINVAL;
4303
4304 if (assoc) {
4305 rcu_read_lock();
4306 have_sta = sta_info_get(sdata, cbss->bssid);
4307 rcu_read_unlock();
4308 }
4309
4310 if (!have_sta) {
4311 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
4312 if (!new_sta)
4313 return -ENOMEM;
4314 }
4315
4316 if (new_sta || override) {
4317 err = ieee80211_prep_channel(sdata, cbss);
4318 if (err) {
4319 if (new_sta)
4320 sta_info_free(local, new_sta);
4321 return -EINVAL;
4322 }
4323 }
4324
4325 if (new_sta) {
4326 u32 rates = 0, basic_rates = 0;
4327 bool have_higher_than_11mbit;
4328 int min_rate = INT_MAX, min_rate_index = -1;
4329 struct ieee80211_chanctx_conf *chanctx_conf;
4330 const struct cfg80211_bss_ies *ies;
4331 int shift = ieee80211_vif_get_shift(&sdata->vif);
4332 u32 rate_flags;
4333
4334 rcu_read_lock();
4335 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4336 if (WARN_ON(!chanctx_conf)) {
4337 rcu_read_unlock();
4338 sta_info_free(local, new_sta);
4339 return -EINVAL;
4340 }
4341 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
4342 rcu_read_unlock();
4343
4344 ieee80211_get_rates(sband, bss->supp_rates,
4345 bss->supp_rates_len,
4346 &rates, &basic_rates,
4347 &have_higher_than_11mbit,
4348 &min_rate, &min_rate_index,
4349 shift, rate_flags);
4350
4351 /*
4352 * This used to be a workaround for basic rates missing
4353 * in the association response frame. Now that we no
4354 * longer use the basic rates from there, it probably
4355 * doesn't happen any more, but keep the workaround so
4356 * in case some *other* APs are buggy in different ways
4357 * we can connect -- with a warning.
4358 */
4359 if (!basic_rates && min_rate_index >= 0) {
4360 sdata_info(sdata,
4361 "No basic rates, using min rate instead\n");
4362 basic_rates = BIT(min_rate_index);
4363 }
4364
4365 new_sta->sta.supp_rates[cbss->channel->band] = rates;
4366 sdata->vif.bss_conf.basic_rates = basic_rates;
4367
4368 /* cf. IEEE 802.11 9.2.12 */
4369 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
4370 have_higher_than_11mbit)
4371 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
4372 else
4373 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
4374
4375 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
4376
4377 /* set timing information */
4378 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
4379 rcu_read_lock();
4380 ies = rcu_dereference(cbss->beacon_ies);
4381 if (ies) {
4382 const u8 *tim_ie;
4383
4384 sdata->vif.bss_conf.sync_tsf = ies->tsf;
4385 sdata->vif.bss_conf.sync_device_ts =
4386 bss->device_ts_beacon;
4387 tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4388 ies->data, ies->len);
4389 if (tim_ie && tim_ie[1] >= 2)
4390 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
4391 else
4392 sdata->vif.bss_conf.sync_dtim_count = 0;
4393 } else if (!ieee80211_hw_check(&sdata->local->hw,
4394 TIMING_BEACON_ONLY)) {
4395 ies = rcu_dereference(cbss->proberesp_ies);
4396 /* must be non-NULL since beacon IEs were NULL */
4397 sdata->vif.bss_conf.sync_tsf = ies->tsf;
4398 sdata->vif.bss_conf.sync_device_ts =
4399 bss->device_ts_presp;
4400 sdata->vif.bss_conf.sync_dtim_count = 0;
4401 } else {
4402 sdata->vif.bss_conf.sync_tsf = 0;
4403 sdata->vif.bss_conf.sync_device_ts = 0;
4404 sdata->vif.bss_conf.sync_dtim_count = 0;
4405 }
4406 rcu_read_unlock();
4407
4408 /* tell driver about BSSID, basic rates and timing */
4409 ieee80211_bss_info_change_notify(sdata,
4410 BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4411 BSS_CHANGED_BEACON_INT);
4412
4413 if (assoc)
4414 sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4415
4416 err = sta_info_insert(new_sta);
4417 new_sta = NULL;
4418 if (err) {
4419 sdata_info(sdata,
4420 "failed to insert STA entry for the AP (error %d)\n",
4421 err);
4422 return err;
4423 }
4424 } else
4425 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4426
4427 /* Cancel scan to ensure that nothing interferes with connection */
4428 if (local->scanning)
4429 ieee80211_scan_cancel(local);
4430
4431 return 0;
4432 }
4433
4434 /* config hooks */
4435 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4436 struct cfg80211_auth_request *req)
4437 {
4438 struct ieee80211_local *local = sdata->local;
4439 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4440 struct ieee80211_mgd_auth_data *auth_data;
4441 u16 auth_alg;
4442 int err;
4443
4444 /* prepare auth data structure */
4445
4446 switch (req->auth_type) {
4447 case NL80211_AUTHTYPE_OPEN_SYSTEM:
4448 auth_alg = WLAN_AUTH_OPEN;
4449 break;
4450 case NL80211_AUTHTYPE_SHARED_KEY:
4451 if (IS_ERR(local->wep_tx_tfm))
4452 return -EOPNOTSUPP;
4453 auth_alg = WLAN_AUTH_SHARED_KEY;
4454 break;
4455 case NL80211_AUTHTYPE_FT:
4456 auth_alg = WLAN_AUTH_FT;
4457 break;
4458 case NL80211_AUTHTYPE_NETWORK_EAP:
4459 auth_alg = WLAN_AUTH_LEAP;
4460 break;
4461 case NL80211_AUTHTYPE_SAE:
4462 auth_alg = WLAN_AUTH_SAE;
4463 break;
4464 default:
4465 return -EOPNOTSUPP;
4466 }
4467
4468 auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
4469 req->ie_len, GFP_KERNEL);
4470 if (!auth_data)
4471 return -ENOMEM;
4472
4473 auth_data->bss = req->bss;
4474
4475 if (req->sae_data_len >= 4) {
4476 __le16 *pos = (__le16 *) req->sae_data;
4477 auth_data->sae_trans = le16_to_cpu(pos[0]);
4478 auth_data->sae_status = le16_to_cpu(pos[1]);
4479 memcpy(auth_data->data, req->sae_data + 4,
4480 req->sae_data_len - 4);
4481 auth_data->data_len += req->sae_data_len - 4;
4482 }
4483
4484 if (req->ie && req->ie_len) {
4485 memcpy(&auth_data->data[auth_data->data_len],
4486 req->ie, req->ie_len);
4487 auth_data->data_len += req->ie_len;
4488 }
4489
4490 if (req->key && req->key_len) {
4491 auth_data->key_len = req->key_len;
4492 auth_data->key_idx = req->key_idx;
4493 memcpy(auth_data->key, req->key, req->key_len);
4494 }
4495
4496 auth_data->algorithm = auth_alg;
4497
4498 /* try to authenticate/probe */
4499
4500 if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4501 ifmgd->assoc_data) {
4502 err = -EBUSY;
4503 goto err_free;
4504 }
4505
4506 if (ifmgd->auth_data)
4507 ieee80211_destroy_auth_data(sdata, false);
4508
4509 /* prep auth_data so we don't go into idle on disassoc */
4510 ifmgd->auth_data = auth_data;
4511
4512 if (ifmgd->associated) {
4513 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4514
4515 sdata_info(sdata,
4516 "disconnect from AP %pM for new auth to %pM\n",
4517 ifmgd->associated->bssid, req->bss->bssid);
4518 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4519 WLAN_REASON_UNSPECIFIED,
4520 false, frame_buf);
4521
4522 ieee80211_report_disconnect(sdata, frame_buf,
4523 sizeof(frame_buf), true,
4524 WLAN_REASON_UNSPECIFIED);
4525 }
4526
4527 sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4528
4529 err = ieee80211_prep_connection(sdata, req->bss, false, false);
4530 if (err)
4531 goto err_clear;
4532
4533 err = ieee80211_auth(sdata);
4534 if (err) {
4535 sta_info_destroy_addr(sdata, req->bss->bssid);
4536 goto err_clear;
4537 }
4538
4539 /* hold our own reference */
4540 cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4541 return 0;
4542
4543 err_clear:
4544 eth_zero_addr(ifmgd->bssid);
4545 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4546 ifmgd->auth_data = NULL;
4547 mutex_lock(&sdata->local->mtx);
4548 ieee80211_vif_release_channel(sdata);
4549 mutex_unlock(&sdata->local->mtx);
4550 err_free:
4551 kfree(auth_data);
4552 return err;
4553 }
4554
4555 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4556 struct cfg80211_assoc_request *req)
4557 {
4558 struct ieee80211_local *local = sdata->local;
4559 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4560 struct ieee80211_bss *bss = (void *)req->bss->priv;
4561 struct ieee80211_mgd_assoc_data *assoc_data;
4562 const struct cfg80211_bss_ies *beacon_ies;
4563 struct ieee80211_supported_band *sband;
4564 const u8 *ssidie, *ht_ie, *vht_ie;
4565 int i, err;
4566 bool override = false;
4567
4568 assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4569 if (!assoc_data)
4570 return -ENOMEM;
4571
4572 rcu_read_lock();
4573 ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4574 if (!ssidie) {
4575 rcu_read_unlock();
4576 kfree(assoc_data);
4577 return -EINVAL;
4578 }
4579 memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4580 assoc_data->ssid_len = ssidie[1];
4581 rcu_read_unlock();
4582
4583 if (ifmgd->associated) {
4584 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4585
4586 sdata_info(sdata,
4587 "disconnect from AP %pM for new assoc to %pM\n",
4588 ifmgd->associated->bssid, req->bss->bssid);
4589 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4590 WLAN_REASON_UNSPECIFIED,
4591 false, frame_buf);
4592
4593 ieee80211_report_disconnect(sdata, frame_buf,
4594 sizeof(frame_buf), true,
4595 WLAN_REASON_UNSPECIFIED);
4596 }
4597
4598 if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4599 err = -EBUSY;
4600 goto err_free;
4601 }
4602
4603 if (ifmgd->assoc_data) {
4604 err = -EBUSY;
4605 goto err_free;
4606 }
4607
4608 if (ifmgd->auth_data) {
4609 bool match;
4610
4611 /* keep sta info, bssid if matching */
4612 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4613 ieee80211_destroy_auth_data(sdata, match);
4614 }
4615
4616 /* prepare assoc data */
4617
4618 ifmgd->beacon_crc_valid = false;
4619
4620 assoc_data->wmm = bss->wmm_used &&
4621 (local->hw.queues >= IEEE80211_NUM_ACS);
4622
4623 /*
4624 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4625 * We still associate in non-HT mode (11a/b/g) if any one of these
4626 * ciphers is configured as pairwise.
4627 * We can set this to true for non-11n hardware, that'll be checked
4628 * separately along with the peer capabilities.
4629 */
4630 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4631 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4632 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4633 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4634 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4635 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4636 netdev_info(sdata->dev,
4637 "disabling HT/VHT due to WEP/TKIP use\n");
4638 }
4639 }
4640
4641 /* Also disable HT if we don't support it or the AP doesn't use WMM */
4642 sband = local->hw.wiphy->bands[req->bss->channel->band];
4643 if (!sband->ht_cap.ht_supported ||
4644 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4645 ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4646 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4647 if (!bss->wmm_used &&
4648 !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4649 netdev_info(sdata->dev,
4650 "disabling HT as WMM/QoS is not supported by the AP\n");
4651 }
4652
4653 /* disable VHT if we don't support it or the AP doesn't use WMM */
4654 if (!sband->vht_cap.vht_supported ||
4655 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4656 ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4657 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4658 if (!bss->wmm_used &&
4659 !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4660 netdev_info(sdata->dev,
4661 "disabling VHT as WMM/QoS is not supported by the AP\n");
4662 }
4663
4664 memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4665 memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4666 sizeof(ifmgd->ht_capa_mask));
4667
4668 memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4669 memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4670 sizeof(ifmgd->vht_capa_mask));
4671
4672 if (req->ie && req->ie_len) {
4673 memcpy(assoc_data->ie, req->ie, req->ie_len);
4674 assoc_data->ie_len = req->ie_len;
4675 }
4676
4677 assoc_data->bss = req->bss;
4678
4679 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4680 if (ifmgd->powersave)
4681 sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4682 else
4683 sdata->smps_mode = IEEE80211_SMPS_OFF;
4684 } else
4685 sdata->smps_mode = ifmgd->req_smps;
4686
4687 assoc_data->capability = req->bss->capability;
4688 assoc_data->supp_rates = bss->supp_rates;
4689 assoc_data->supp_rates_len = bss->supp_rates_len;
4690
4691 rcu_read_lock();
4692 ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4693 if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4694 assoc_data->ap_ht_param =
4695 ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4696 else
4697 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4698 vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4699 if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4700 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4701 sizeof(struct ieee80211_vht_cap));
4702 else
4703 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4704 rcu_read_unlock();
4705
4706 if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) &&
4707 ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK),
4708 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"))
4709 sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;
4710
4711 if (bss->wmm_used && bss->uapsd_supported &&
4712 (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) {
4713 assoc_data->uapsd = true;
4714 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4715 } else {
4716 assoc_data->uapsd = false;
4717 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4718 }
4719
4720 if (req->prev_bssid)
4721 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4722
4723 if (req->use_mfp) {
4724 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4725 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4726 } else {
4727 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4728 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4729 }
4730
4731 if (req->flags & ASSOC_REQ_USE_RRM)
4732 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
4733 else
4734 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;
4735
4736 if (req->crypto.control_port)
4737 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4738 else
4739 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4740
4741 sdata->control_port_protocol = req->crypto.control_port_ethertype;
4742 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4743 sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4744 sdata->vif.type);
4745
4746 /* kick off associate process */
4747
4748 ifmgd->assoc_data = assoc_data;
4749 ifmgd->dtim_period = 0;
4750 ifmgd->have_beacon = false;
4751
4752 /* override HT/VHT configuration only if the AP and we support it */
4753 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
4754 struct ieee80211_sta_ht_cap sta_ht_cap;
4755
4756 if (req->flags & ASSOC_REQ_DISABLE_HT)
4757 override = true;
4758
4759 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
4760 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
4761
4762 /* check for 40 MHz disable override */
4763 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ) &&
4764 sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
4765 !(sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
4766 override = true;
4767
4768 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4769 req->flags & ASSOC_REQ_DISABLE_VHT)
4770 override = true;
4771 }
4772
4773 if (req->flags & ASSOC_REQ_DISABLE_HT) {
4774 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4775 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4776 }
4777
4778 if (req->flags & ASSOC_REQ_DISABLE_VHT)
4779 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4780
4781 err = ieee80211_prep_connection(sdata, req->bss, true, override);
4782 if (err)
4783 goto err_clear;
4784
4785 rcu_read_lock();
4786 beacon_ies = rcu_dereference(req->bss->beacon_ies);
4787
4788 if (ieee80211_hw_check(&sdata->local->hw, NEED_DTIM_BEFORE_ASSOC) &&
4789 !beacon_ies) {
4790 /*
4791 * Wait up to one beacon interval ...
4792 * should this be more if we miss one?
4793 */
4794 sdata_info(sdata, "waiting for beacon from %pM\n",
4795 ifmgd->bssid);
4796 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4797 assoc_data->timeout_started = true;
4798 assoc_data->need_beacon = true;
4799 } else if (beacon_ies) {
4800 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4801 beacon_ies->data,
4802 beacon_ies->len);
4803 u8 dtim_count = 0;
4804
4805 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4806 const struct ieee80211_tim_ie *tim;
4807 tim = (void *)(tim_ie + 2);
4808 ifmgd->dtim_period = tim->dtim_period;
4809 dtim_count = tim->dtim_count;
4810 }
4811 ifmgd->have_beacon = true;
4812 assoc_data->timeout = jiffies;
4813 assoc_data->timeout_started = true;
4814
4815 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
4816 sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4817 sdata->vif.bss_conf.sync_device_ts =
4818 bss->device_ts_beacon;
4819 sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4820 }
4821 } else {
4822 assoc_data->timeout = jiffies;
4823 assoc_data->timeout_started = true;
4824 }
4825 rcu_read_unlock();
4826
4827 run_again(sdata, assoc_data->timeout);
4828
4829 if (bss->corrupt_data) {
4830 char *corrupt_type = "data";
4831 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4832 if (bss->corrupt_data &
4833 IEEE80211_BSS_CORRUPT_PROBE_RESP)
4834 corrupt_type = "beacon and probe response";
4835 else
4836 corrupt_type = "beacon";
4837 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4838 corrupt_type = "probe response";
4839 sdata_info(sdata, "associating with AP with corrupt %s\n",
4840 corrupt_type);
4841 }
4842
4843 return 0;
4844 err_clear:
4845 eth_zero_addr(ifmgd->bssid);
4846 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4847 ifmgd->assoc_data = NULL;
4848 err_free:
4849 kfree(assoc_data);
4850 return err;
4851 }
4852
4853 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4854 struct cfg80211_deauth_request *req)
4855 {
4856 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4857 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4858 bool tx = !req->local_state_change;
4859
4860 if (ifmgd->auth_data &&
4861 ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
4862 sdata_info(sdata,
4863 "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
4864 req->bssid, req->reason_code,
4865 ieee80211_get_reason_code_string(req->reason_code));
4866
4867 drv_mgd_prepare_tx(sdata->local, sdata);
4868 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4869 IEEE80211_STYPE_DEAUTH,
4870 req->reason_code, tx,
4871 frame_buf);
4872 ieee80211_destroy_auth_data(sdata, false);
4873 ieee80211_report_disconnect(sdata, frame_buf,
4874 sizeof(frame_buf), true,
4875 req->reason_code);
4876
4877 return 0;
4878 }
4879
4880 if (ifmgd->assoc_data &&
4881 ether_addr_equal(ifmgd->assoc_data->bss->bssid, req->bssid)) {
4882 sdata_info(sdata,
4883 "aborting association with %pM by local choice (Reason: %u=%s)\n",
4884 req->bssid, req->reason_code,
4885 ieee80211_get_reason_code_string(req->reason_code));
4886
4887 drv_mgd_prepare_tx(sdata->local, sdata);
4888 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4889 IEEE80211_STYPE_DEAUTH,
4890 req->reason_code, tx,
4891 frame_buf);
4892 ieee80211_destroy_assoc_data(sdata, false);
4893 ieee80211_report_disconnect(sdata, frame_buf,
4894 sizeof(frame_buf), true,
4895 req->reason_code);
4896 return 0;
4897 }
4898
4899 if (ifmgd->associated &&
4900 ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4901 sdata_info(sdata,
4902 "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
4903 req->bssid, req->reason_code,
4904 ieee80211_get_reason_code_string(req->reason_code));
4905
4906 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4907 req->reason_code, tx, frame_buf);
4908 ieee80211_report_disconnect(sdata, frame_buf,
4909 sizeof(frame_buf), true,
4910 req->reason_code);
4911 return 0;
4912 }
4913
4914 return -ENOTCONN;
4915 }
4916
4917 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4918 struct cfg80211_disassoc_request *req)
4919 {
4920 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4921 u8 bssid[ETH_ALEN];
4922 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4923
4924 /*
4925 * cfg80211 should catch this ... but it's racy since
4926 * we can receive a disassoc frame, process it, hand it
4927 * to cfg80211 while that's in a locked section already
4928 * trying to tell us that the user wants to disconnect.
4929 */
4930 if (ifmgd->associated != req->bss)
4931 return -ENOLINK;
4932
4933 sdata_info(sdata,
4934 "disassociating from %pM by local choice (Reason: %u=%s)\n",
4935 req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
4936
4937 memcpy(bssid, req->bss->bssid, ETH_ALEN);
4938 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
4939 req->reason_code, !req->local_state_change,
4940 frame_buf);
4941
4942 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
4943 req->reason_code);
4944
4945 return 0;
4946 }
4947
4948 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4949 {
4950 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4951
4952 /*
4953 * Make sure some work items will not run after this,
4954 * they will not do anything but might not have been
4955 * cancelled when disconnecting.
4956 */
4957 cancel_work_sync(&ifmgd->monitor_work);
4958 cancel_work_sync(&ifmgd->beacon_connection_loss_work);
4959 cancel_work_sync(&ifmgd->request_smps_work);
4960 cancel_work_sync(&ifmgd->csa_connection_drop_work);
4961 cancel_work_sync(&ifmgd->chswitch_work);
4962 cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
4963
4964 sdata_lock(sdata);
4965 if (ifmgd->assoc_data) {
4966 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
4967 ieee80211_destroy_assoc_data(sdata, false);
4968 cfg80211_assoc_timeout(sdata->dev, bss);
4969 }
4970 if (ifmgd->auth_data)
4971 ieee80211_destroy_auth_data(sdata, false);
4972 spin_lock_bh(&ifmgd->teardown_lock);
4973 if (ifmgd->teardown_skb) {
4974 kfree_skb(ifmgd->teardown_skb);
4975 ifmgd->teardown_skb = NULL;
4976 ifmgd->orig_teardown_skb = NULL;
4977 }
4978 spin_unlock_bh(&ifmgd->teardown_lock);
4979 del_timer_sync(&ifmgd->timer);
4980 sdata_unlock(sdata);
4981 }
4982
4983 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
4984 enum nl80211_cqm_rssi_threshold_event rssi_event,
4985 gfp_t gfp)
4986 {
4987 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4988
4989 trace_api_cqm_rssi_notify(sdata, rssi_event);
4990
4991 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
4992 }
4993 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
4994
4995 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp)
4996 {
4997 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4998
4999 trace_api_cqm_beacon_loss_notify(sdata->local, sdata);
5000
5001 cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp);
5002 }
5003 EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify);
Linux kernel - Deliverables
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