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mac80211: fix suspend vs. association race
[mirror_ubuntu-bionic-kernel.git] / net / mac80211 / mlme.c
1 /*
2 * BSS client mode implementation
3 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4 * Copyright 2004, Instant802 Networks, Inc.
5 * Copyright 2005, Devicescape Software, Inc.
6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14 #include <linux/delay.h>
15 #include <linux/if_ether.h>
16 #include <linux/skbuff.h>
17 #include <linux/if_arp.h>
18 #include <linux/etherdevice.h>
19 #include <linux/moduleparam.h>
20 #include <linux/rtnetlink.h>
21 #include <linux/pm_qos.h>
22 #include <linux/crc32.h>
23 #include <linux/slab.h>
24 #include <linux/export.h>
25 #include <net/mac80211.h>
26 #include <asm/unaligned.h>
27
28 #include "ieee80211_i.h"
29 #include "driver-ops.h"
30 #include "rate.h"
31 #include "led.h"
32
33 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
34 #define IEEE80211_AUTH_TIMEOUT_LONG (HZ / 2)
35 #define IEEE80211_AUTH_TIMEOUT_SHORT (HZ / 10)
36 #define IEEE80211_AUTH_MAX_TRIES 3
37 #define IEEE80211_AUTH_WAIT_ASSOC (HZ * 5)
38 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
39 #define IEEE80211_ASSOC_TIMEOUT_LONG (HZ / 2)
40 #define IEEE80211_ASSOC_TIMEOUT_SHORT (HZ / 10)
41 #define IEEE80211_ASSOC_MAX_TRIES 3
42
43 static int max_nullfunc_tries = 2;
44 module_param(max_nullfunc_tries, int, 0644);
45 MODULE_PARM_DESC(max_nullfunc_tries,
46 "Maximum nullfunc tx tries before disconnecting (reason 4).");
47
48 static int max_probe_tries = 5;
49 module_param(max_probe_tries, int, 0644);
50 MODULE_PARM_DESC(max_probe_tries,
51 "Maximum probe tries before disconnecting (reason 4).");
52
53 /*
54 * Beacon loss timeout is calculated as N frames times the
55 * advertised beacon interval. This may need to be somewhat
56 * higher than what hardware might detect to account for
57 * delays in the host processing frames. But since we also
58 * probe on beacon miss before declaring the connection lost
59 * default to what we want.
60 */
61 static int beacon_loss_count = 7;
62 module_param(beacon_loss_count, int, 0644);
63 MODULE_PARM_DESC(beacon_loss_count,
64 "Number of beacon intervals before we decide beacon was lost.");
65
66 /*
67 * Time the connection can be idle before we probe
68 * it to see if we can still talk to the AP.
69 */
70 #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ)
71 /*
72 * Time we wait for a probe response after sending
73 * a probe request because of beacon loss or for
74 * checking the connection still works.
75 */
76 static int probe_wait_ms = 500;
77 module_param(probe_wait_ms, int, 0644);
78 MODULE_PARM_DESC(probe_wait_ms,
79 "Maximum time(ms) to wait for probe response"
80 " before disconnecting (reason 4).");
81
82 /*
83 * Weight given to the latest Beacon frame when calculating average signal
84 * strength for Beacon frames received in the current BSS. This must be
85 * between 1 and 15.
86 */
87 #define IEEE80211_SIGNAL_AVE_WEIGHT 3
88
89 /*
90 * How many Beacon frames need to have been used in average signal strength
91 * before starting to indicate signal change events.
92 */
93 #define IEEE80211_SIGNAL_AVE_MIN_COUNT 4
94
95 /*
96 * We can have multiple work items (and connection probing)
97 * scheduling this timer, but we need to take care to only
98 * reschedule it when it should fire _earlier_ than it was
99 * asked for before, or if it's not pending right now. This
100 * function ensures that. Note that it then is required to
101 * run this function for all timeouts after the first one
102 * has happened -- the work that runs from this timer will
103 * do that.
104 */
105 static void run_again(struct ieee80211_sub_if_data *sdata,
106 unsigned long timeout)
107 {
108 sdata_assert_lock(sdata);
109
110 if (!timer_pending(&sdata->u.mgd.timer) ||
111 time_before(timeout, sdata->u.mgd.timer.expires))
112 mod_timer(&sdata->u.mgd.timer, timeout);
113 }
114
115 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
116 {
117 if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
118 return;
119
120 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
121 return;
122
123 mod_timer(&sdata->u.mgd.bcn_mon_timer,
124 round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
125 }
126
127 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
128 {
129 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
130
131 if (unlikely(!sdata->u.mgd.associated))
132 return;
133
134 ifmgd->probe_send_count = 0;
135
136 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
137 return;
138
139 mod_timer(&sdata->u.mgd.conn_mon_timer,
140 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
141 }
142
143 static int ecw2cw(int ecw)
144 {
145 return (1 << ecw) - 1;
146 }
147
148 static u32
149 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
150 struct ieee80211_supported_band *sband,
151 struct ieee80211_channel *channel,
152 const struct ieee80211_ht_operation *ht_oper,
153 const struct ieee80211_vht_operation *vht_oper,
154 struct cfg80211_chan_def *chandef, bool tracking)
155 {
156 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
157 struct cfg80211_chan_def vht_chandef;
158 u32 ht_cfreq, ret;
159
160 chandef->chan = channel;
161 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
162 chandef->center_freq1 = channel->center_freq;
163 chandef->center_freq2 = 0;
164
165 if (!ht_oper || !sband->ht_cap.ht_supported) {
166 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
167 goto out;
168 }
169
170 chandef->width = NL80211_CHAN_WIDTH_20;
171
172 ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
173 channel->band);
174 /* check that channel matches the right operating channel */
175 if (!tracking && channel->center_freq != ht_cfreq) {
176 /*
177 * It's possible that some APs are confused here;
178 * Netgear WNDR3700 sometimes reports 4 higher than
179 * the actual channel in association responses, but
180 * since we look at probe response/beacon data here
181 * it should be OK.
182 */
183 sdata_info(sdata,
184 "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
185 channel->center_freq, ht_cfreq,
186 ht_oper->primary_chan, channel->band);
187 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
188 goto out;
189 }
190
191 /* check 40 MHz support, if we have it */
192 if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
193 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
194 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
195 chandef->width = NL80211_CHAN_WIDTH_40;
196 chandef->center_freq1 += 10;
197 break;
198 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
199 chandef->width = NL80211_CHAN_WIDTH_40;
200 chandef->center_freq1 -= 10;
201 break;
202 }
203 } else {
204 /* 40 MHz (and 80 MHz) must be supported for VHT */
205 ret = IEEE80211_STA_DISABLE_VHT;
206 /* also mark 40 MHz disabled */
207 ret |= IEEE80211_STA_DISABLE_40MHZ;
208 goto out;
209 }
210
211 if (!vht_oper || !sband->vht_cap.vht_supported) {
212 ret = IEEE80211_STA_DISABLE_VHT;
213 goto out;
214 }
215
216 vht_chandef.chan = channel;
217 vht_chandef.center_freq1 =
218 ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx,
219 channel->band);
220 vht_chandef.center_freq2 = 0;
221
222 switch (vht_oper->chan_width) {
223 case IEEE80211_VHT_CHANWIDTH_USE_HT:
224 vht_chandef.width = chandef->width;
225 vht_chandef.center_freq1 = chandef->center_freq1;
226 break;
227 case IEEE80211_VHT_CHANWIDTH_80MHZ:
228 vht_chandef.width = NL80211_CHAN_WIDTH_80;
229 break;
230 case IEEE80211_VHT_CHANWIDTH_160MHZ:
231 vht_chandef.width = NL80211_CHAN_WIDTH_160;
232 break;
233 case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
234 vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
235 vht_chandef.center_freq2 =
236 ieee80211_channel_to_frequency(
237 vht_oper->center_freq_seg2_idx,
238 channel->band);
239 break;
240 default:
241 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
242 sdata_info(sdata,
243 "AP VHT operation IE has invalid channel width (%d), disable VHT\n",
244 vht_oper->chan_width);
245 ret = IEEE80211_STA_DISABLE_VHT;
246 goto out;
247 }
248
249 if (!cfg80211_chandef_valid(&vht_chandef)) {
250 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
251 sdata_info(sdata,
252 "AP VHT information is invalid, disable VHT\n");
253 ret = IEEE80211_STA_DISABLE_VHT;
254 goto out;
255 }
256
257 if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
258 ret = 0;
259 goto out;
260 }
261
262 if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
263 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
264 sdata_info(sdata,
265 "AP VHT information doesn't match HT, disable VHT\n");
266 ret = IEEE80211_STA_DISABLE_VHT;
267 goto out;
268 }
269
270 *chandef = vht_chandef;
271
272 ret = 0;
273
274 out:
275 /*
276 * When tracking the current AP, don't do any further checks if the
277 * new chandef is identical to the one we're currently using for the
278 * connection. This keeps us from playing ping-pong with regulatory,
279 * without it the following can happen (for example):
280 * - connect to an AP with 80 MHz, world regdom allows 80 MHz
281 * - AP advertises regdom US
282 * - CRDA loads regdom US with 80 MHz prohibited (old database)
283 * - the code below detects an unsupported channel, downgrades, and
284 * we disconnect from the AP in the caller
285 * - disconnect causes CRDA to reload world regdomain and the game
286 * starts anew.
287 * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
288 *
289 * It seems possible that there are still scenarios with CSA or real
290 * bandwidth changes where a this could happen, but those cases are
291 * less common and wouldn't completely prevent using the AP.
292 */
293 if (tracking &&
294 cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
295 return ret;
296
297 /* don't print the message below for VHT mismatch if VHT is disabled */
298 if (ret & IEEE80211_STA_DISABLE_VHT)
299 vht_chandef = *chandef;
300
301 /*
302 * Ignore the DISABLED flag when we're already connected and only
303 * tracking the APs beacon for bandwidth changes - otherwise we
304 * might get disconnected here if we connect to an AP, update our
305 * regulatory information based on the AP's country IE and the
306 * information we have is wrong/outdated and disables the channel
307 * that we're actually using for the connection to the AP.
308 */
309 while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
310 tracking ? 0 :
311 IEEE80211_CHAN_DISABLED)) {
312 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
313 ret = IEEE80211_STA_DISABLE_HT |
314 IEEE80211_STA_DISABLE_VHT;
315 break;
316 }
317
318 ret |= ieee80211_chandef_downgrade(chandef);
319 }
320
321 if (chandef->width != vht_chandef.width && !tracking)
322 sdata_info(sdata,
323 "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
324
325 WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
326 return ret;
327 }
328
329 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
330 struct sta_info *sta,
331 const struct ieee80211_ht_operation *ht_oper,
332 const struct ieee80211_vht_operation *vht_oper,
333 const u8 *bssid, u32 *changed)
334 {
335 struct ieee80211_local *local = sdata->local;
336 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
337 struct ieee80211_supported_band *sband;
338 struct ieee80211_channel *chan;
339 struct cfg80211_chan_def chandef;
340 u16 ht_opmode;
341 u32 flags;
342 enum ieee80211_sta_rx_bandwidth new_sta_bw;
343 int ret;
344
345 /* if HT was/is disabled, don't track any bandwidth changes */
346 if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
347 return 0;
348
349 /* don't check VHT if we associated as non-VHT station */
350 if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
351 vht_oper = NULL;
352
353 if (WARN_ON_ONCE(!sta))
354 return -EINVAL;
355
356 /*
357 * if bss configuration changed store the new one -
358 * this may be applicable even if channel is identical
359 */
360 ht_opmode = le16_to_cpu(ht_oper->operation_mode);
361 if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
362 *changed |= BSS_CHANGED_HT;
363 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
364 }
365
366 chan = sdata->vif.bss_conf.chandef.chan;
367 sband = local->hw.wiphy->bands[chan->band];
368
369 /* calculate new channel (type) based on HT/VHT operation IEs */
370 flags = ieee80211_determine_chantype(sdata, sband, chan, ht_oper,
371 vht_oper, &chandef, true);
372
373 /*
374 * Downgrade the new channel if we associated with restricted
375 * capabilities. For example, if we associated as a 20 MHz STA
376 * to a 40 MHz AP (due to regulatory, capabilities or config
377 * reasons) then switching to a 40 MHz channel now won't do us
378 * any good -- we couldn't use it with the AP.
379 */
380 if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
381 chandef.width == NL80211_CHAN_WIDTH_80P80)
382 flags |= ieee80211_chandef_downgrade(&chandef);
383 if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
384 chandef.width == NL80211_CHAN_WIDTH_160)
385 flags |= ieee80211_chandef_downgrade(&chandef);
386 if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
387 chandef.width > NL80211_CHAN_WIDTH_20)
388 flags |= ieee80211_chandef_downgrade(&chandef);
389
390 if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
391 return 0;
392
393 sdata_info(sdata,
394 "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
395 ifmgd->bssid, chandef.chan->center_freq, chandef.width,
396 chandef.center_freq1, chandef.center_freq2);
397
398 if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
399 IEEE80211_STA_DISABLE_VHT |
400 IEEE80211_STA_DISABLE_40MHZ |
401 IEEE80211_STA_DISABLE_80P80MHZ |
402 IEEE80211_STA_DISABLE_160MHZ)) ||
403 !cfg80211_chandef_valid(&chandef)) {
404 sdata_info(sdata,
405 "AP %pM changed bandwidth in a way we can't support - disconnect\n",
406 ifmgd->bssid);
407 return -EINVAL;
408 }
409
410 switch (chandef.width) {
411 case NL80211_CHAN_WIDTH_20_NOHT:
412 case NL80211_CHAN_WIDTH_20:
413 new_sta_bw = IEEE80211_STA_RX_BW_20;
414 break;
415 case NL80211_CHAN_WIDTH_40:
416 new_sta_bw = IEEE80211_STA_RX_BW_40;
417 break;
418 case NL80211_CHAN_WIDTH_80:
419 new_sta_bw = IEEE80211_STA_RX_BW_80;
420 break;
421 case NL80211_CHAN_WIDTH_80P80:
422 case NL80211_CHAN_WIDTH_160:
423 new_sta_bw = IEEE80211_STA_RX_BW_160;
424 break;
425 default:
426 return -EINVAL;
427 }
428
429 if (new_sta_bw > sta->cur_max_bandwidth)
430 new_sta_bw = sta->cur_max_bandwidth;
431
432 if (new_sta_bw < sta->sta.bandwidth) {
433 sta->sta.bandwidth = new_sta_bw;
434 rate_control_rate_update(local, sband, sta,
435 IEEE80211_RC_BW_CHANGED);
436 }
437
438 ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
439 if (ret) {
440 sdata_info(sdata,
441 "AP %pM changed bandwidth to incompatible one - disconnect\n",
442 ifmgd->bssid);
443 return ret;
444 }
445
446 if (new_sta_bw > sta->sta.bandwidth) {
447 sta->sta.bandwidth = new_sta_bw;
448 rate_control_rate_update(local, sband, sta,
449 IEEE80211_RC_BW_CHANGED);
450 }
451
452 return 0;
453 }
454
455 /* frame sending functions */
456
457 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
458 struct sk_buff *skb, u8 ap_ht_param,
459 struct ieee80211_supported_band *sband,
460 struct ieee80211_channel *channel,
461 enum ieee80211_smps_mode smps)
462 {
463 u8 *pos;
464 u32 flags = channel->flags;
465 u16 cap;
466 struct ieee80211_sta_ht_cap ht_cap;
467
468 BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
469
470 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
471 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
472
473 /* determine capability flags */
474 cap = ht_cap.cap;
475
476 switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
477 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
478 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
479 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
480 cap &= ~IEEE80211_HT_CAP_SGI_40;
481 }
482 break;
483 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
484 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
485 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
486 cap &= ~IEEE80211_HT_CAP_SGI_40;
487 }
488 break;
489 }
490
491 /*
492 * If 40 MHz was disabled associate as though we weren't
493 * capable of 40 MHz -- some broken APs will never fall
494 * back to trying to transmit in 20 MHz.
495 */
496 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
497 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
498 cap &= ~IEEE80211_HT_CAP_SGI_40;
499 }
500
501 /* set SM PS mode properly */
502 cap &= ~IEEE80211_HT_CAP_SM_PS;
503 switch (smps) {
504 case IEEE80211_SMPS_AUTOMATIC:
505 case IEEE80211_SMPS_NUM_MODES:
506 WARN_ON(1);
507 case IEEE80211_SMPS_OFF:
508 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
509 IEEE80211_HT_CAP_SM_PS_SHIFT;
510 break;
511 case IEEE80211_SMPS_STATIC:
512 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
513 IEEE80211_HT_CAP_SM_PS_SHIFT;
514 break;
515 case IEEE80211_SMPS_DYNAMIC:
516 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
517 IEEE80211_HT_CAP_SM_PS_SHIFT;
518 break;
519 }
520
521 /* reserve and fill IE */
522 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
523 ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
524 }
525
526 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
527 struct sk_buff *skb,
528 struct ieee80211_supported_band *sband,
529 struct ieee80211_vht_cap *ap_vht_cap)
530 {
531 u8 *pos;
532 u32 cap;
533 struct ieee80211_sta_vht_cap vht_cap;
534 u32 mask, ap_bf_sts, our_bf_sts;
535
536 BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
537
538 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
539 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
540
541 /* determine capability flags */
542 cap = vht_cap.cap;
543
544 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
545 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ;
546 cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
547 }
548
549 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
550 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
551 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
552 }
553
554 /*
555 * Some APs apparently get confused if our capabilities are better
556 * than theirs, so restrict what we advertise in the assoc request.
557 */
558 if (!(ap_vht_cap->vht_cap_info &
559 cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
560 cap &= ~IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE;
561
562 mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
563
564 ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask;
565 our_bf_sts = cap & mask;
566
567 if (ap_bf_sts < our_bf_sts) {
568 cap &= ~mask;
569 cap |= ap_bf_sts;
570 }
571
572 /* reserve and fill IE */
573 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
574 ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
575 }
576
577 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
578 {
579 struct ieee80211_local *local = sdata->local;
580 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
581 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
582 struct sk_buff *skb;
583 struct ieee80211_mgmt *mgmt;
584 u8 *pos, qos_info;
585 size_t offset = 0, noffset;
586 int i, count, rates_len, supp_rates_len, shift;
587 u16 capab;
588 struct ieee80211_supported_band *sband;
589 struct ieee80211_chanctx_conf *chanctx_conf;
590 struct ieee80211_channel *chan;
591 u32 rate_flags, rates = 0;
592
593 sdata_assert_lock(sdata);
594
595 rcu_read_lock();
596 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
597 if (WARN_ON(!chanctx_conf)) {
598 rcu_read_unlock();
599 return;
600 }
601 chan = chanctx_conf->def.chan;
602 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
603 rcu_read_unlock();
604 sband = local->hw.wiphy->bands[chan->band];
605 shift = ieee80211_vif_get_shift(&sdata->vif);
606
607 if (assoc_data->supp_rates_len) {
608 /*
609 * Get all rates supported by the device and the AP as
610 * some APs don't like getting a superset of their rates
611 * in the association request (e.g. D-Link DAP 1353 in
612 * b-only mode)...
613 */
614 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
615 assoc_data->supp_rates,
616 assoc_data->supp_rates_len,
617 &rates);
618 } else {
619 /*
620 * In case AP not provide any supported rates information
621 * before association, we send information element(s) with
622 * all rates that we support.
623 */
624 rates_len = 0;
625 for (i = 0; i < sband->n_bitrates; i++) {
626 if ((rate_flags & sband->bitrates[i].flags)
627 != rate_flags)
628 continue;
629 rates |= BIT(i);
630 rates_len++;
631 }
632 }
633
634 skb = alloc_skb(local->hw.extra_tx_headroom +
635 sizeof(*mgmt) + /* bit too much but doesn't matter */
636 2 + assoc_data->ssid_len + /* SSID */
637 4 + rates_len + /* (extended) rates */
638 4 + /* power capability */
639 2 + 2 * sband->n_channels + /* supported channels */
640 2 + sizeof(struct ieee80211_ht_cap) + /* HT */
641 2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
642 assoc_data->ie_len + /* extra IEs */
643 9, /* WMM */
644 GFP_KERNEL);
645 if (!skb)
646 return;
647
648 skb_reserve(skb, local->hw.extra_tx_headroom);
649
650 capab = WLAN_CAPABILITY_ESS;
651
652 if (sband->band == IEEE80211_BAND_2GHZ) {
653 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
654 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
655 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
656 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
657 }
658
659 if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
660 capab |= WLAN_CAPABILITY_PRIVACY;
661
662 if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
663 (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
664 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
665
666 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
667 memset(mgmt, 0, 24);
668 memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
669 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
670 memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
671
672 if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
673 skb_put(skb, 10);
674 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
675 IEEE80211_STYPE_REASSOC_REQ);
676 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
677 mgmt->u.reassoc_req.listen_interval =
678 cpu_to_le16(local->hw.conf.listen_interval);
679 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
680 ETH_ALEN);
681 } else {
682 skb_put(skb, 4);
683 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
684 IEEE80211_STYPE_ASSOC_REQ);
685 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
686 mgmt->u.assoc_req.listen_interval =
687 cpu_to_le16(local->hw.conf.listen_interval);
688 }
689
690 /* SSID */
691 pos = skb_put(skb, 2 + assoc_data->ssid_len);
692 *pos++ = WLAN_EID_SSID;
693 *pos++ = assoc_data->ssid_len;
694 memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
695
696 /* add all rates which were marked to be used above */
697 supp_rates_len = rates_len;
698 if (supp_rates_len > 8)
699 supp_rates_len = 8;
700
701 pos = skb_put(skb, supp_rates_len + 2);
702 *pos++ = WLAN_EID_SUPP_RATES;
703 *pos++ = supp_rates_len;
704
705 count = 0;
706 for (i = 0; i < sband->n_bitrates; i++) {
707 if (BIT(i) & rates) {
708 int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
709 5 * (1 << shift));
710 *pos++ = (u8) rate;
711 if (++count == 8)
712 break;
713 }
714 }
715
716 if (rates_len > count) {
717 pos = skb_put(skb, rates_len - count + 2);
718 *pos++ = WLAN_EID_EXT_SUPP_RATES;
719 *pos++ = rates_len - count;
720
721 for (i++; i < sband->n_bitrates; i++) {
722 if (BIT(i) & rates) {
723 int rate;
724 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
725 5 * (1 << shift));
726 *pos++ = (u8) rate;
727 }
728 }
729 }
730
731 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
732 /* 1. power capabilities */
733 pos = skb_put(skb, 4);
734 *pos++ = WLAN_EID_PWR_CAPABILITY;
735 *pos++ = 2;
736 *pos++ = 0; /* min tx power */
737 /* max tx power */
738 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
739
740 /* 2. supported channels */
741 /* TODO: get this in reg domain format */
742 pos = skb_put(skb, 2 * sband->n_channels + 2);
743 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
744 *pos++ = 2 * sband->n_channels;
745 for (i = 0; i < sband->n_channels; i++) {
746 *pos++ = ieee80211_frequency_to_channel(
747 sband->channels[i].center_freq);
748 *pos++ = 1; /* one channel in the subband*/
749 }
750 }
751
752 /* if present, add any custom IEs that go before HT */
753 if (assoc_data->ie_len) {
754 static const u8 before_ht[] = {
755 WLAN_EID_SSID,
756 WLAN_EID_SUPP_RATES,
757 WLAN_EID_EXT_SUPP_RATES,
758 WLAN_EID_PWR_CAPABILITY,
759 WLAN_EID_SUPPORTED_CHANNELS,
760 WLAN_EID_RSN,
761 WLAN_EID_QOS_CAPA,
762 WLAN_EID_RRM_ENABLED_CAPABILITIES,
763 WLAN_EID_MOBILITY_DOMAIN,
764 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
765 };
766 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
767 before_ht, ARRAY_SIZE(before_ht),
768 offset);
769 pos = skb_put(skb, noffset - offset);
770 memcpy(pos, assoc_data->ie + offset, noffset - offset);
771 offset = noffset;
772 }
773
774 if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
775 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
776 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
777
778 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
779 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
780 sband, chan, sdata->smps_mode);
781
782 /* if present, add any custom IEs that go before VHT */
783 if (assoc_data->ie_len) {
784 static const u8 before_vht[] = {
785 WLAN_EID_SSID,
786 WLAN_EID_SUPP_RATES,
787 WLAN_EID_EXT_SUPP_RATES,
788 WLAN_EID_PWR_CAPABILITY,
789 WLAN_EID_SUPPORTED_CHANNELS,
790 WLAN_EID_RSN,
791 WLAN_EID_QOS_CAPA,
792 WLAN_EID_RRM_ENABLED_CAPABILITIES,
793 WLAN_EID_MOBILITY_DOMAIN,
794 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
795 WLAN_EID_HT_CAPABILITY,
796 WLAN_EID_BSS_COEX_2040,
797 WLAN_EID_EXT_CAPABILITY,
798 WLAN_EID_QOS_TRAFFIC_CAPA,
799 WLAN_EID_TIM_BCAST_REQ,
800 WLAN_EID_INTERWORKING,
801 };
802 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
803 before_vht, ARRAY_SIZE(before_vht),
804 offset);
805 pos = skb_put(skb, noffset - offset);
806 memcpy(pos, assoc_data->ie + offset, noffset - offset);
807 offset = noffset;
808 }
809
810 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
811 ieee80211_add_vht_ie(sdata, skb, sband,
812 &assoc_data->ap_vht_cap);
813
814 /* if present, add any custom non-vendor IEs that go after HT */
815 if (assoc_data->ie_len) {
816 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
817 assoc_data->ie_len,
818 offset);
819 pos = skb_put(skb, noffset - offset);
820 memcpy(pos, assoc_data->ie + offset, noffset - offset);
821 offset = noffset;
822 }
823
824 if (assoc_data->wmm) {
825 if (assoc_data->uapsd) {
826 qos_info = ifmgd->uapsd_queues;
827 qos_info |= (ifmgd->uapsd_max_sp_len <<
828 IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
829 } else {
830 qos_info = 0;
831 }
832
833 pos = skb_put(skb, 9);
834 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
835 *pos++ = 7; /* len */
836 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
837 *pos++ = 0x50;
838 *pos++ = 0xf2;
839 *pos++ = 2; /* WME */
840 *pos++ = 0; /* WME info */
841 *pos++ = 1; /* WME ver */
842 *pos++ = qos_info;
843 }
844
845 /* add any remaining custom (i.e. vendor specific here) IEs */
846 if (assoc_data->ie_len) {
847 noffset = assoc_data->ie_len;
848 pos = skb_put(skb, noffset - offset);
849 memcpy(pos, assoc_data->ie + offset, noffset - offset);
850 }
851
852 drv_mgd_prepare_tx(local, sdata);
853
854 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
855 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
856 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
857 IEEE80211_TX_INTFL_MLME_CONN_TX;
858 ieee80211_tx_skb(sdata, skb);
859 }
860
861 void ieee80211_send_pspoll(struct ieee80211_local *local,
862 struct ieee80211_sub_if_data *sdata)
863 {
864 struct ieee80211_pspoll *pspoll;
865 struct sk_buff *skb;
866
867 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
868 if (!skb)
869 return;
870
871 pspoll = (struct ieee80211_pspoll *) skb->data;
872 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
873
874 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
875 ieee80211_tx_skb(sdata, skb);
876 }
877
878 void ieee80211_send_nullfunc(struct ieee80211_local *local,
879 struct ieee80211_sub_if_data *sdata,
880 int powersave)
881 {
882 struct sk_buff *skb;
883 struct ieee80211_hdr_3addr *nullfunc;
884 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
885
886 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
887 if (!skb)
888 return;
889
890 nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
891 if (powersave)
892 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
893
894 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
895 IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
896
897 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
898 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
899
900 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
901 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
902
903 ieee80211_tx_skb(sdata, skb);
904 }
905
906 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
907 struct ieee80211_sub_if_data *sdata)
908 {
909 struct sk_buff *skb;
910 struct ieee80211_hdr *nullfunc;
911 __le16 fc;
912
913 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
914 return;
915
916 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
917 if (!skb)
918 return;
919
920 skb_reserve(skb, local->hw.extra_tx_headroom);
921
922 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
923 memset(nullfunc, 0, 30);
924 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
925 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
926 nullfunc->frame_control = fc;
927 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
928 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
929 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
930 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
931
932 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
933 ieee80211_tx_skb(sdata, skb);
934 }
935
936 /* spectrum management related things */
937 static void ieee80211_chswitch_work(struct work_struct *work)
938 {
939 struct ieee80211_sub_if_data *sdata =
940 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
941 struct ieee80211_local *local = sdata->local;
942 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
943 u32 changed = 0;
944 int ret;
945
946 if (!ieee80211_sdata_running(sdata))
947 return;
948
949 sdata_lock(sdata);
950 if (!ifmgd->associated)
951 goto out;
952
953 mutex_lock(&local->mtx);
954 ret = ieee80211_vif_change_channel(sdata, &changed);
955 mutex_unlock(&local->mtx);
956 if (ret) {
957 sdata_info(sdata,
958 "vif channel switch failed, disconnecting\n");
959 ieee80211_queue_work(&sdata->local->hw,
960 &ifmgd->csa_connection_drop_work);
961 goto out;
962 }
963
964 if (!local->use_chanctx) {
965 local->_oper_chandef = sdata->csa_chandef;
966 /* Call "hw_config" only if doing sw channel switch.
967 * Otherwise update the channel directly
968 */
969 if (!local->ops->channel_switch)
970 ieee80211_hw_config(local, 0);
971 else
972 local->hw.conf.chandef = local->_oper_chandef;
973 }
974
975 /* XXX: shouldn't really modify cfg80211-owned data! */
976 ifmgd->associated->channel = sdata->csa_chandef.chan;
977
978 /* XXX: wait for a beacon first? */
979 ieee80211_wake_queues_by_reason(&local->hw,
980 IEEE80211_MAX_QUEUE_MAP,
981 IEEE80211_QUEUE_STOP_REASON_CSA);
982
983 ieee80211_bss_info_change_notify(sdata, changed);
984
985 out:
986 sdata->vif.csa_active = false;
987 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
988 sdata_unlock(sdata);
989 }
990
991 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
992 {
993 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
994 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
995
996 trace_api_chswitch_done(sdata, success);
997 if (!success) {
998 sdata_info(sdata,
999 "driver channel switch failed, disconnecting\n");
1000 ieee80211_queue_work(&sdata->local->hw,
1001 &ifmgd->csa_connection_drop_work);
1002 } else {
1003 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1004 }
1005 }
1006 EXPORT_SYMBOL(ieee80211_chswitch_done);
1007
1008 static void ieee80211_chswitch_timer(unsigned long data)
1009 {
1010 struct ieee80211_sub_if_data *sdata =
1011 (struct ieee80211_sub_if_data *) data;
1012
1013 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1014 }
1015
1016 static void
1017 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1018 u64 timestamp, struct ieee802_11_elems *elems,
1019 bool beacon)
1020 {
1021 struct ieee80211_local *local = sdata->local;
1022 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1023 struct cfg80211_bss *cbss = ifmgd->associated;
1024 struct ieee80211_chanctx *chanctx;
1025 enum ieee80211_band current_band;
1026 struct ieee80211_csa_ie csa_ie;
1027 int res;
1028
1029 sdata_assert_lock(sdata);
1030
1031 if (!cbss)
1032 return;
1033
1034 if (local->scanning)
1035 return;
1036
1037 /* disregard subsequent announcements if we are already processing */
1038 if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
1039 return;
1040
1041 current_band = cbss->channel->band;
1042 memset(&csa_ie, 0, sizeof(csa_ie));
1043 res = ieee80211_parse_ch_switch_ie(sdata, elems, beacon, current_band,
1044 ifmgd->flags,
1045 ifmgd->associated->bssid, &csa_ie);
1046 if (res < 0)
1047 ieee80211_queue_work(&local->hw,
1048 &ifmgd->csa_connection_drop_work);
1049 if (res)
1050 return;
1051
1052 if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1053 IEEE80211_CHAN_DISABLED)) {
1054 sdata_info(sdata,
1055 "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1056 ifmgd->associated->bssid,
1057 csa_ie.chandef.chan->center_freq,
1058 csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1059 csa_ie.chandef.center_freq2);
1060 ieee80211_queue_work(&local->hw,
1061 &ifmgd->csa_connection_drop_work);
1062 return;
1063 }
1064
1065 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
1066
1067 mutex_lock(&local->chanctx_mtx);
1068 if (local->use_chanctx) {
1069 u32 num_chanctx = 0;
1070 list_for_each_entry(chanctx, &local->chanctx_list, list)
1071 num_chanctx++;
1072
1073 if (num_chanctx > 1 ||
1074 !(local->hw.flags & IEEE80211_HW_CHANCTX_STA_CSA)) {
1075 sdata_info(sdata,
1076 "not handling chan-switch with channel contexts\n");
1077 ieee80211_queue_work(&local->hw,
1078 &ifmgd->csa_connection_drop_work);
1079 mutex_unlock(&local->chanctx_mtx);
1080 return;
1081 }
1082 }
1083
1084 if (WARN_ON(!rcu_access_pointer(sdata->vif.chanctx_conf))) {
1085 ieee80211_queue_work(&local->hw,
1086 &ifmgd->csa_connection_drop_work);
1087 mutex_unlock(&local->chanctx_mtx);
1088 return;
1089 }
1090 chanctx = container_of(rcu_access_pointer(sdata->vif.chanctx_conf),
1091 struct ieee80211_chanctx, conf);
1092 if (chanctx->refcount > 1) {
1093 sdata_info(sdata,
1094 "channel switch with multiple interfaces on the same channel, disconnecting\n");
1095 ieee80211_queue_work(&local->hw,
1096 &ifmgd->csa_connection_drop_work);
1097 mutex_unlock(&local->chanctx_mtx);
1098 return;
1099 }
1100 mutex_unlock(&local->chanctx_mtx);
1101
1102 sdata->csa_chandef = csa_ie.chandef;
1103 sdata->vif.csa_active = true;
1104
1105 if (csa_ie.mode)
1106 ieee80211_stop_queues_by_reason(&local->hw,
1107 IEEE80211_MAX_QUEUE_MAP,
1108 IEEE80211_QUEUE_STOP_REASON_CSA);
1109
1110 if (local->ops->channel_switch) {
1111 /* use driver's channel switch callback */
1112 struct ieee80211_channel_switch ch_switch = {
1113 .timestamp = timestamp,
1114 .block_tx = csa_ie.mode,
1115 .chandef = csa_ie.chandef,
1116 .count = csa_ie.count,
1117 };
1118
1119 drv_channel_switch(local, &ch_switch);
1120 return;
1121 }
1122
1123 /* channel switch handled in software */
1124 if (csa_ie.count <= 1)
1125 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1126 else
1127 mod_timer(&ifmgd->chswitch_timer,
1128 TU_TO_EXP_TIME(csa_ie.count * cbss->beacon_interval));
1129 }
1130
1131 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1132 struct ieee80211_channel *channel,
1133 const u8 *country_ie, u8 country_ie_len,
1134 const u8 *pwr_constr_elem)
1135 {
1136 struct ieee80211_country_ie_triplet *triplet;
1137 int chan = ieee80211_frequency_to_channel(channel->center_freq);
1138 int i, chan_pwr, chan_increment, new_ap_level;
1139 bool have_chan_pwr = false;
1140
1141 /* Invalid IE */
1142 if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1143 return 0;
1144
1145 triplet = (void *)(country_ie + 3);
1146 country_ie_len -= 3;
1147
1148 switch (channel->band) {
1149 default:
1150 WARN_ON_ONCE(1);
1151 /* fall through */
1152 case IEEE80211_BAND_2GHZ:
1153 case IEEE80211_BAND_60GHZ:
1154 chan_increment = 1;
1155 break;
1156 case IEEE80211_BAND_5GHZ:
1157 chan_increment = 4;
1158 break;
1159 }
1160
1161 /* find channel */
1162 while (country_ie_len >= 3) {
1163 u8 first_channel = triplet->chans.first_channel;
1164
1165 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1166 goto next;
1167
1168 for (i = 0; i < triplet->chans.num_channels; i++) {
1169 if (first_channel + i * chan_increment == chan) {
1170 have_chan_pwr = true;
1171 chan_pwr = triplet->chans.max_power;
1172 break;
1173 }
1174 }
1175 if (have_chan_pwr)
1176 break;
1177
1178 next:
1179 triplet++;
1180 country_ie_len -= 3;
1181 }
1182
1183 if (!have_chan_pwr)
1184 return 0;
1185
1186 new_ap_level = max_t(int, 0, chan_pwr - *pwr_constr_elem);
1187
1188 if (sdata->ap_power_level == new_ap_level)
1189 return 0;
1190
1191 sdata_info(sdata,
1192 "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1193 new_ap_level, chan_pwr, *pwr_constr_elem,
1194 sdata->u.mgd.bssid);
1195 sdata->ap_power_level = new_ap_level;
1196 if (__ieee80211_recalc_txpower(sdata))
1197 return BSS_CHANGED_TXPOWER;
1198 return 0;
1199 }
1200
1201 /* powersave */
1202 static void ieee80211_enable_ps(struct ieee80211_local *local,
1203 struct ieee80211_sub_if_data *sdata)
1204 {
1205 struct ieee80211_conf *conf = &local->hw.conf;
1206
1207 /*
1208 * If we are scanning right now then the parameters will
1209 * take effect when scan finishes.
1210 */
1211 if (local->scanning)
1212 return;
1213
1214 if (conf->dynamic_ps_timeout > 0 &&
1215 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
1216 mod_timer(&local->dynamic_ps_timer, jiffies +
1217 msecs_to_jiffies(conf->dynamic_ps_timeout));
1218 } else {
1219 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1220 ieee80211_send_nullfunc(local, sdata, 1);
1221
1222 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1223 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
1224 return;
1225
1226 conf->flags |= IEEE80211_CONF_PS;
1227 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1228 }
1229 }
1230
1231 static void ieee80211_change_ps(struct ieee80211_local *local)
1232 {
1233 struct ieee80211_conf *conf = &local->hw.conf;
1234
1235 if (local->ps_sdata) {
1236 ieee80211_enable_ps(local, local->ps_sdata);
1237 } else if (conf->flags & IEEE80211_CONF_PS) {
1238 conf->flags &= ~IEEE80211_CONF_PS;
1239 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1240 del_timer_sync(&local->dynamic_ps_timer);
1241 cancel_work_sync(&local->dynamic_ps_enable_work);
1242 }
1243 }
1244
1245 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1246 {
1247 struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1248 struct sta_info *sta = NULL;
1249 bool authorized = false;
1250
1251 if (!mgd->powersave)
1252 return false;
1253
1254 if (mgd->broken_ap)
1255 return false;
1256
1257 if (!mgd->associated)
1258 return false;
1259
1260 if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1261 return false;
1262
1263 if (!mgd->have_beacon)
1264 return false;
1265
1266 rcu_read_lock();
1267 sta = sta_info_get(sdata, mgd->bssid);
1268 if (sta)
1269 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1270 rcu_read_unlock();
1271
1272 return authorized;
1273 }
1274
1275 /* need to hold RTNL or interface lock */
1276 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1277 {
1278 struct ieee80211_sub_if_data *sdata, *found = NULL;
1279 int count = 0;
1280 int timeout;
1281
1282 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
1283 local->ps_sdata = NULL;
1284 return;
1285 }
1286
1287 list_for_each_entry(sdata, &local->interfaces, list) {
1288 if (!ieee80211_sdata_running(sdata))
1289 continue;
1290 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1291 /* If an AP vif is found, then disable PS
1292 * by setting the count to zero thereby setting
1293 * ps_sdata to NULL.
1294 */
1295 count = 0;
1296 break;
1297 }
1298 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1299 continue;
1300 found = sdata;
1301 count++;
1302 }
1303
1304 if (count == 1 && ieee80211_powersave_allowed(found)) {
1305 s32 beaconint_us;
1306
1307 if (latency < 0)
1308 latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1309
1310 beaconint_us = ieee80211_tu_to_usec(
1311 found->vif.bss_conf.beacon_int);
1312
1313 timeout = local->dynamic_ps_forced_timeout;
1314 if (timeout < 0) {
1315 /*
1316 * Go to full PSM if the user configures a very low
1317 * latency requirement.
1318 * The 2000 second value is there for compatibility
1319 * until the PM_QOS_NETWORK_LATENCY is configured
1320 * with real values.
1321 */
1322 if (latency > (1900 * USEC_PER_MSEC) &&
1323 latency != (2000 * USEC_PER_SEC))
1324 timeout = 0;
1325 else
1326 timeout = 100;
1327 }
1328 local->hw.conf.dynamic_ps_timeout = timeout;
1329
1330 if (beaconint_us > latency) {
1331 local->ps_sdata = NULL;
1332 } else {
1333 int maxslp = 1;
1334 u8 dtimper = found->u.mgd.dtim_period;
1335
1336 /* If the TIM IE is invalid, pretend the value is 1 */
1337 if (!dtimper)
1338 dtimper = 1;
1339 else if (dtimper > 1)
1340 maxslp = min_t(int, dtimper,
1341 latency / beaconint_us);
1342
1343 local->hw.conf.max_sleep_period = maxslp;
1344 local->hw.conf.ps_dtim_period = dtimper;
1345 local->ps_sdata = found;
1346 }
1347 } else {
1348 local->ps_sdata = NULL;
1349 }
1350
1351 ieee80211_change_ps(local);
1352 }
1353
1354 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1355 {
1356 bool ps_allowed = ieee80211_powersave_allowed(sdata);
1357
1358 if (sdata->vif.bss_conf.ps != ps_allowed) {
1359 sdata->vif.bss_conf.ps = ps_allowed;
1360 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1361 }
1362 }
1363
1364 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1365 {
1366 struct ieee80211_local *local =
1367 container_of(work, struct ieee80211_local,
1368 dynamic_ps_disable_work);
1369
1370 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1371 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1372 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1373 }
1374
1375 ieee80211_wake_queues_by_reason(&local->hw,
1376 IEEE80211_MAX_QUEUE_MAP,
1377 IEEE80211_QUEUE_STOP_REASON_PS);
1378 }
1379
1380 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1381 {
1382 struct ieee80211_local *local =
1383 container_of(work, struct ieee80211_local,
1384 dynamic_ps_enable_work);
1385 struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1386 struct ieee80211_if_managed *ifmgd;
1387 unsigned long flags;
1388 int q;
1389
1390 /* can only happen when PS was just disabled anyway */
1391 if (!sdata)
1392 return;
1393
1394 ifmgd = &sdata->u.mgd;
1395
1396 if (local->hw.conf.flags & IEEE80211_CONF_PS)
1397 return;
1398
1399 if (local->hw.conf.dynamic_ps_timeout > 0) {
1400 /* don't enter PS if TX frames are pending */
1401 if (drv_tx_frames_pending(local)) {
1402 mod_timer(&local->dynamic_ps_timer, jiffies +
1403 msecs_to_jiffies(
1404 local->hw.conf.dynamic_ps_timeout));
1405 return;
1406 }
1407
1408 /*
1409 * transmission can be stopped by others which leads to
1410 * dynamic_ps_timer expiry. Postpone the ps timer if it
1411 * is not the actual idle state.
1412 */
1413 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1414 for (q = 0; q < local->hw.queues; q++) {
1415 if (local->queue_stop_reasons[q]) {
1416 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1417 flags);
1418 mod_timer(&local->dynamic_ps_timer, jiffies +
1419 msecs_to_jiffies(
1420 local->hw.conf.dynamic_ps_timeout));
1421 return;
1422 }
1423 }
1424 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1425 }
1426
1427 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1428 !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1429 if (drv_tx_frames_pending(local)) {
1430 mod_timer(&local->dynamic_ps_timer, jiffies +
1431 msecs_to_jiffies(
1432 local->hw.conf.dynamic_ps_timeout));
1433 } else {
1434 ieee80211_send_nullfunc(local, sdata, 1);
1435 /* Flush to get the tx status of nullfunc frame */
1436 ieee80211_flush_queues(local, sdata);
1437 }
1438 }
1439
1440 if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1441 (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1442 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1443 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1444 local->hw.conf.flags |= IEEE80211_CONF_PS;
1445 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1446 }
1447 }
1448
1449 void ieee80211_dynamic_ps_timer(unsigned long data)
1450 {
1451 struct ieee80211_local *local = (void *) data;
1452
1453 if (local->quiescing || local->suspended)
1454 return;
1455
1456 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1457 }
1458
1459 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1460 {
1461 struct delayed_work *delayed_work =
1462 container_of(work, struct delayed_work, work);
1463 struct ieee80211_sub_if_data *sdata =
1464 container_of(delayed_work, struct ieee80211_sub_if_data,
1465 dfs_cac_timer_work);
1466 struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1467
1468 mutex_lock(&sdata->local->mtx);
1469 if (sdata->wdev.cac_started) {
1470 ieee80211_vif_release_channel(sdata);
1471 cfg80211_cac_event(sdata->dev, &chandef,
1472 NL80211_RADAR_CAC_FINISHED,
1473 GFP_KERNEL);
1474 }
1475 mutex_unlock(&sdata->local->mtx);
1476 }
1477
1478 /* MLME */
1479 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1480 struct ieee80211_sub_if_data *sdata,
1481 const u8 *wmm_param, size_t wmm_param_len)
1482 {
1483 struct ieee80211_tx_queue_params params;
1484 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1485 size_t left;
1486 int count;
1487 const u8 *pos;
1488 u8 uapsd_queues = 0;
1489
1490 if (!local->ops->conf_tx)
1491 return false;
1492
1493 if (local->hw.queues < IEEE80211_NUM_ACS)
1494 return false;
1495
1496 if (!wmm_param)
1497 return false;
1498
1499 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1500 return false;
1501
1502 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1503 uapsd_queues = ifmgd->uapsd_queues;
1504
1505 count = wmm_param[6] & 0x0f;
1506 if (count == ifmgd->wmm_last_param_set)
1507 return false;
1508 ifmgd->wmm_last_param_set = count;
1509
1510 pos = wmm_param + 8;
1511 left = wmm_param_len - 8;
1512
1513 memset(&params, 0, sizeof(params));
1514
1515 sdata->wmm_acm = 0;
1516 for (; left >= 4; left -= 4, pos += 4) {
1517 int aci = (pos[0] >> 5) & 0x03;
1518 int acm = (pos[0] >> 4) & 0x01;
1519 bool uapsd = false;
1520 int queue;
1521
1522 switch (aci) {
1523 case 1: /* AC_BK */
1524 queue = 3;
1525 if (acm)
1526 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1527 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1528 uapsd = true;
1529 break;
1530 case 2: /* AC_VI */
1531 queue = 1;
1532 if (acm)
1533 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1534 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1535 uapsd = true;
1536 break;
1537 case 3: /* AC_VO */
1538 queue = 0;
1539 if (acm)
1540 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1541 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1542 uapsd = true;
1543 break;
1544 case 0: /* AC_BE */
1545 default:
1546 queue = 2;
1547 if (acm)
1548 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1549 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1550 uapsd = true;
1551 break;
1552 }
1553
1554 params.aifs = pos[0] & 0x0f;
1555 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1556 params.cw_min = ecw2cw(pos[1] & 0x0f);
1557 params.txop = get_unaligned_le16(pos + 2);
1558 params.acm = acm;
1559 params.uapsd = uapsd;
1560
1561 mlme_dbg(sdata,
1562 "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1563 queue, aci, acm,
1564 params.aifs, params.cw_min, params.cw_max,
1565 params.txop, params.uapsd);
1566 sdata->tx_conf[queue] = params;
1567 if (drv_conf_tx(local, sdata, queue, &params))
1568 sdata_err(sdata,
1569 "failed to set TX queue parameters for queue %d\n",
1570 queue);
1571 }
1572
1573 /* enable WMM or activate new settings */
1574 sdata->vif.bss_conf.qos = true;
1575 return true;
1576 }
1577
1578 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1579 {
1580 lockdep_assert_held(&sdata->local->mtx);
1581
1582 sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1583 ieee80211_run_deferred_scan(sdata->local);
1584 }
1585
1586 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1587 {
1588 mutex_lock(&sdata->local->mtx);
1589 __ieee80211_stop_poll(sdata);
1590 mutex_unlock(&sdata->local->mtx);
1591 }
1592
1593 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1594 u16 capab, bool erp_valid, u8 erp)
1595 {
1596 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1597 u32 changed = 0;
1598 bool use_protection;
1599 bool use_short_preamble;
1600 bool use_short_slot;
1601
1602 if (erp_valid) {
1603 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1604 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1605 } else {
1606 use_protection = false;
1607 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1608 }
1609
1610 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1611 if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1612 use_short_slot = true;
1613
1614 if (use_protection != bss_conf->use_cts_prot) {
1615 bss_conf->use_cts_prot = use_protection;
1616 changed |= BSS_CHANGED_ERP_CTS_PROT;
1617 }
1618
1619 if (use_short_preamble != bss_conf->use_short_preamble) {
1620 bss_conf->use_short_preamble = use_short_preamble;
1621 changed |= BSS_CHANGED_ERP_PREAMBLE;
1622 }
1623
1624 if (use_short_slot != bss_conf->use_short_slot) {
1625 bss_conf->use_short_slot = use_short_slot;
1626 changed |= BSS_CHANGED_ERP_SLOT;
1627 }
1628
1629 return changed;
1630 }
1631
1632 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1633 struct cfg80211_bss *cbss,
1634 u32 bss_info_changed)
1635 {
1636 struct ieee80211_bss *bss = (void *)cbss->priv;
1637 struct ieee80211_local *local = sdata->local;
1638 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1639
1640 bss_info_changed |= BSS_CHANGED_ASSOC;
1641 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1642 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1643
1644 sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1645 beacon_loss_count * bss_conf->beacon_int));
1646
1647 sdata->u.mgd.associated = cbss;
1648 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1649
1650 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1651
1652 if (sdata->vif.p2p) {
1653 const struct cfg80211_bss_ies *ies;
1654
1655 rcu_read_lock();
1656 ies = rcu_dereference(cbss->ies);
1657 if (ies) {
1658 int ret;
1659
1660 ret = cfg80211_get_p2p_attr(
1661 ies->data, ies->len,
1662 IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1663 (u8 *) &bss_conf->p2p_noa_attr,
1664 sizeof(bss_conf->p2p_noa_attr));
1665 if (ret >= 2) {
1666 sdata->u.mgd.p2p_noa_index =
1667 bss_conf->p2p_noa_attr.index;
1668 bss_info_changed |= BSS_CHANGED_P2P_PS;
1669 }
1670 }
1671 rcu_read_unlock();
1672 }
1673
1674 /* just to be sure */
1675 ieee80211_stop_poll(sdata);
1676
1677 ieee80211_led_assoc(local, 1);
1678
1679 if (sdata->u.mgd.have_beacon) {
1680 /*
1681 * If the AP is buggy we may get here with no DTIM period
1682 * known, so assume it's 1 which is the only safe assumption
1683 * in that case, although if the TIM IE is broken powersave
1684 * probably just won't work at all.
1685 */
1686 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1687 bss_conf->beacon_rate = bss->beacon_rate;
1688 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1689 } else {
1690 bss_conf->beacon_rate = NULL;
1691 bss_conf->dtim_period = 0;
1692 }
1693
1694 bss_conf->assoc = 1;
1695
1696 /* Tell the driver to monitor connection quality (if supported) */
1697 if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1698 bss_conf->cqm_rssi_thold)
1699 bss_info_changed |= BSS_CHANGED_CQM;
1700
1701 /* Enable ARP filtering */
1702 if (bss_conf->arp_addr_cnt)
1703 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1704
1705 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1706
1707 mutex_lock(&local->iflist_mtx);
1708 ieee80211_recalc_ps(local, -1);
1709 mutex_unlock(&local->iflist_mtx);
1710
1711 ieee80211_recalc_smps(sdata);
1712 ieee80211_recalc_ps_vif(sdata);
1713
1714 netif_carrier_on(sdata->dev);
1715 }
1716
1717 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1718 u16 stype, u16 reason, bool tx,
1719 u8 *frame_buf)
1720 {
1721 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1722 struct ieee80211_local *local = sdata->local;
1723 u32 changed = 0;
1724
1725 sdata_assert_lock(sdata);
1726
1727 if (WARN_ON_ONCE(tx && !frame_buf))
1728 return;
1729
1730 if (WARN_ON(!ifmgd->associated))
1731 return;
1732
1733 ieee80211_stop_poll(sdata);
1734
1735 ifmgd->associated = NULL;
1736 netif_carrier_off(sdata->dev);
1737
1738 /*
1739 * if we want to get out of ps before disassoc (why?) we have
1740 * to do it before sending disassoc, as otherwise the null-packet
1741 * won't be valid.
1742 */
1743 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1744 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1745 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1746 }
1747 local->ps_sdata = NULL;
1748
1749 /* disable per-vif ps */
1750 ieee80211_recalc_ps_vif(sdata);
1751
1752 /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
1753 if (tx)
1754 ieee80211_flush_queues(local, sdata);
1755
1756 /* deauthenticate/disassociate now */
1757 if (tx || frame_buf)
1758 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
1759 reason, tx, frame_buf);
1760
1761 /* flush out frame */
1762 if (tx)
1763 ieee80211_flush_queues(local, sdata);
1764
1765 /* clear bssid only after building the needed mgmt frames */
1766 memset(ifmgd->bssid, 0, ETH_ALEN);
1767
1768 /* remove AP and TDLS peers */
1769 sta_info_flush(sdata);
1770
1771 /* finally reset all BSS / config parameters */
1772 changed |= ieee80211_reset_erp_info(sdata);
1773
1774 ieee80211_led_assoc(local, 0);
1775 changed |= BSS_CHANGED_ASSOC;
1776 sdata->vif.bss_conf.assoc = false;
1777
1778 ifmgd->p2p_noa_index = -1;
1779 memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
1780 sizeof(sdata->vif.bss_conf.p2p_noa_attr));
1781
1782 /* on the next assoc, re-program HT/VHT parameters */
1783 memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1784 memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1785 memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
1786 memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
1787
1788 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1789
1790 del_timer_sync(&local->dynamic_ps_timer);
1791 cancel_work_sync(&local->dynamic_ps_enable_work);
1792
1793 /* Disable ARP filtering */
1794 if (sdata->vif.bss_conf.arp_addr_cnt)
1795 changed |= BSS_CHANGED_ARP_FILTER;
1796
1797 sdata->vif.bss_conf.qos = false;
1798 changed |= BSS_CHANGED_QOS;
1799
1800 /* The BSSID (not really interesting) and HT changed */
1801 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1802 ieee80211_bss_info_change_notify(sdata, changed);
1803
1804 /* disassociated - set to defaults now */
1805 ieee80211_set_wmm_default(sdata, false);
1806
1807 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1808 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1809 del_timer_sync(&sdata->u.mgd.timer);
1810 del_timer_sync(&sdata->u.mgd.chswitch_timer);
1811
1812 sdata->vif.bss_conf.dtim_period = 0;
1813 sdata->vif.bss_conf.beacon_rate = NULL;
1814
1815 ifmgd->have_beacon = false;
1816
1817 ifmgd->flags = 0;
1818 mutex_lock(&local->mtx);
1819 ieee80211_vif_release_channel(sdata);
1820 mutex_unlock(&local->mtx);
1821
1822 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1823 }
1824
1825 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1826 struct ieee80211_hdr *hdr)
1827 {
1828 /*
1829 * We can postpone the mgd.timer whenever receiving unicast frames
1830 * from AP because we know that the connection is working both ways
1831 * at that time. But multicast frames (and hence also beacons) must
1832 * be ignored here, because we need to trigger the timer during
1833 * data idle periods for sending the periodic probe request to the
1834 * AP we're connected to.
1835 */
1836 if (is_multicast_ether_addr(hdr->addr1))
1837 return;
1838
1839 ieee80211_sta_reset_conn_monitor(sdata);
1840 }
1841
1842 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1843 {
1844 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1845 struct ieee80211_local *local = sdata->local;
1846
1847 mutex_lock(&local->mtx);
1848 if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
1849 goto out;
1850
1851 __ieee80211_stop_poll(sdata);
1852
1853 mutex_lock(&local->iflist_mtx);
1854 ieee80211_recalc_ps(local, -1);
1855 mutex_unlock(&local->iflist_mtx);
1856
1857 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1858 goto out;
1859
1860 /*
1861 * We've received a probe response, but are not sure whether
1862 * we have or will be receiving any beacons or data, so let's
1863 * schedule the timers again, just in case.
1864 */
1865 ieee80211_sta_reset_beacon_monitor(sdata);
1866
1867 mod_timer(&ifmgd->conn_mon_timer,
1868 round_jiffies_up(jiffies +
1869 IEEE80211_CONNECTION_IDLE_TIME));
1870 out:
1871 mutex_unlock(&local->mtx);
1872 }
1873
1874 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1875 struct ieee80211_hdr *hdr, bool ack)
1876 {
1877 if (!ieee80211_is_data(hdr->frame_control))
1878 return;
1879
1880 if (ieee80211_is_nullfunc(hdr->frame_control) &&
1881 sdata->u.mgd.probe_send_count > 0) {
1882 if (ack)
1883 ieee80211_sta_reset_conn_monitor(sdata);
1884 else
1885 sdata->u.mgd.nullfunc_failed = true;
1886 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1887 return;
1888 }
1889
1890 if (ack)
1891 ieee80211_sta_reset_conn_monitor(sdata);
1892 }
1893
1894 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1895 {
1896 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1897 const u8 *ssid;
1898 u8 *dst = ifmgd->associated->bssid;
1899 u8 unicast_limit = max(1, max_probe_tries - 3);
1900
1901 /*
1902 * Try sending broadcast probe requests for the last three
1903 * probe requests after the first ones failed since some
1904 * buggy APs only support broadcast probe requests.
1905 */
1906 if (ifmgd->probe_send_count >= unicast_limit)
1907 dst = NULL;
1908
1909 /*
1910 * When the hardware reports an accurate Tx ACK status, it's
1911 * better to send a nullfunc frame instead of a probe request,
1912 * as it will kick us off the AP quickly if we aren't associated
1913 * anymore. The timeout will be reset if the frame is ACKed by
1914 * the AP.
1915 */
1916 ifmgd->probe_send_count++;
1917
1918 if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1919 ifmgd->nullfunc_failed = false;
1920 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1921 } else {
1922 int ssid_len;
1923
1924 rcu_read_lock();
1925 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1926 if (WARN_ON_ONCE(ssid == NULL))
1927 ssid_len = 0;
1928 else
1929 ssid_len = ssid[1];
1930
1931 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
1932 0, (u32) -1, true, 0,
1933 ifmgd->associated->channel, false);
1934 rcu_read_unlock();
1935 }
1936
1937 ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1938 run_again(sdata, ifmgd->probe_timeout);
1939 if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
1940 ieee80211_flush_queues(sdata->local, sdata);
1941 }
1942
1943 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1944 bool beacon)
1945 {
1946 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1947 bool already = false;
1948
1949 if (!ieee80211_sdata_running(sdata))
1950 return;
1951
1952 sdata_lock(sdata);
1953
1954 if (!ifmgd->associated)
1955 goto out;
1956
1957 mutex_lock(&sdata->local->mtx);
1958
1959 if (sdata->local->tmp_channel || sdata->local->scanning) {
1960 mutex_unlock(&sdata->local->mtx);
1961 goto out;
1962 }
1963
1964 if (beacon) {
1965 mlme_dbg_ratelimited(sdata,
1966 "detected beacon loss from AP (missed %d beacons) - probing\n",
1967 beacon_loss_count);
1968
1969 ieee80211_cqm_rssi_notify(&sdata->vif,
1970 NL80211_CQM_RSSI_BEACON_LOSS_EVENT,
1971 GFP_KERNEL);
1972 }
1973
1974 /*
1975 * The driver/our work has already reported this event or the
1976 * connection monitoring has kicked in and we have already sent
1977 * a probe request. Or maybe the AP died and the driver keeps
1978 * reporting until we disassociate...
1979 *
1980 * In either case we have to ignore the current call to this
1981 * function (except for setting the correct probe reason bit)
1982 * because otherwise we would reset the timer every time and
1983 * never check whether we received a probe response!
1984 */
1985 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
1986 already = true;
1987
1988 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1989
1990 mutex_unlock(&sdata->local->mtx);
1991
1992 if (already)
1993 goto out;
1994
1995 mutex_lock(&sdata->local->iflist_mtx);
1996 ieee80211_recalc_ps(sdata->local, -1);
1997 mutex_unlock(&sdata->local->iflist_mtx);
1998
1999 ifmgd->probe_send_count = 0;
2000 ieee80211_mgd_probe_ap_send(sdata);
2001 out:
2002 sdata_unlock(sdata);
2003 }
2004
2005 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2006 struct ieee80211_vif *vif)
2007 {
2008 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2009 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2010 struct cfg80211_bss *cbss;
2011 struct sk_buff *skb;
2012 const u8 *ssid;
2013 int ssid_len;
2014
2015 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2016 return NULL;
2017
2018 sdata_assert_lock(sdata);
2019
2020 if (ifmgd->associated)
2021 cbss = ifmgd->associated;
2022 else if (ifmgd->auth_data)
2023 cbss = ifmgd->auth_data->bss;
2024 else if (ifmgd->assoc_data)
2025 cbss = ifmgd->assoc_data->bss;
2026 else
2027 return NULL;
2028
2029 rcu_read_lock();
2030 ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2031 if (WARN_ON_ONCE(ssid == NULL))
2032 ssid_len = 0;
2033 else
2034 ssid_len = ssid[1];
2035
2036 skb = ieee80211_build_probe_req(sdata, cbss->bssid,
2037 (u32) -1, cbss->channel,
2038 ssid + 2, ssid_len,
2039 NULL, 0, true);
2040 rcu_read_unlock();
2041
2042 return skb;
2043 }
2044 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2045
2046 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2047 {
2048 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2049 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2050
2051 sdata_lock(sdata);
2052 if (!ifmgd->associated) {
2053 sdata_unlock(sdata);
2054 return;
2055 }
2056
2057 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2058 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2059 true, frame_buf);
2060 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
2061 sdata->vif.csa_active = false;
2062 ieee80211_wake_queues_by_reason(&sdata->local->hw,
2063 IEEE80211_MAX_QUEUE_MAP,
2064 IEEE80211_QUEUE_STOP_REASON_CSA);
2065
2066 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
2067 IEEE80211_DEAUTH_FRAME_LEN);
2068 sdata_unlock(sdata);
2069 }
2070
2071 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2072 {
2073 struct ieee80211_sub_if_data *sdata =
2074 container_of(work, struct ieee80211_sub_if_data,
2075 u.mgd.beacon_connection_loss_work);
2076 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2077 struct sta_info *sta;
2078
2079 if (ifmgd->associated) {
2080 rcu_read_lock();
2081 sta = sta_info_get(sdata, ifmgd->bssid);
2082 if (sta)
2083 sta->beacon_loss_count++;
2084 rcu_read_unlock();
2085 }
2086
2087 if (ifmgd->connection_loss) {
2088 sdata_info(sdata, "Connection to AP %pM lost\n",
2089 ifmgd->bssid);
2090 __ieee80211_disconnect(sdata);
2091 } else {
2092 ieee80211_mgd_probe_ap(sdata, true);
2093 }
2094 }
2095
2096 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2097 {
2098 struct ieee80211_sub_if_data *sdata =
2099 container_of(work, struct ieee80211_sub_if_data,
2100 u.mgd.csa_connection_drop_work);
2101
2102 __ieee80211_disconnect(sdata);
2103 }
2104
2105 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2106 {
2107 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2108 struct ieee80211_hw *hw = &sdata->local->hw;
2109
2110 trace_api_beacon_loss(sdata);
2111
2112 sdata->u.mgd.connection_loss = false;
2113 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2114 }
2115 EXPORT_SYMBOL(ieee80211_beacon_loss);
2116
2117 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2118 {
2119 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2120 struct ieee80211_hw *hw = &sdata->local->hw;
2121
2122 trace_api_connection_loss(sdata);
2123
2124 sdata->u.mgd.connection_loss = true;
2125 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2126 }
2127 EXPORT_SYMBOL(ieee80211_connection_loss);
2128
2129
2130 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2131 bool assoc)
2132 {
2133 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2134
2135 sdata_assert_lock(sdata);
2136
2137 if (!assoc) {
2138 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2139
2140 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2141 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2142 sdata->u.mgd.flags = 0;
2143 mutex_lock(&sdata->local->mtx);
2144 ieee80211_vif_release_channel(sdata);
2145 mutex_unlock(&sdata->local->mtx);
2146 }
2147
2148 cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2149 kfree(auth_data);
2150 sdata->u.mgd.auth_data = NULL;
2151 }
2152
2153 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2154 struct ieee80211_mgmt *mgmt, size_t len)
2155 {
2156 struct ieee80211_local *local = sdata->local;
2157 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2158 u8 *pos;
2159 struct ieee802_11_elems elems;
2160 u32 tx_flags = 0;
2161
2162 pos = mgmt->u.auth.variable;
2163 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2164 if (!elems.challenge)
2165 return;
2166 auth_data->expected_transaction = 4;
2167 drv_mgd_prepare_tx(sdata->local, sdata);
2168 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2169 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2170 IEEE80211_TX_INTFL_MLME_CONN_TX;
2171 ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2172 elems.challenge - 2, elems.challenge_len + 2,
2173 auth_data->bss->bssid, auth_data->bss->bssid,
2174 auth_data->key, auth_data->key_len,
2175 auth_data->key_idx, tx_flags);
2176 }
2177
2178 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2179 struct ieee80211_mgmt *mgmt, size_t len)
2180 {
2181 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2182 u8 bssid[ETH_ALEN];
2183 u16 auth_alg, auth_transaction, status_code;
2184 struct sta_info *sta;
2185
2186 sdata_assert_lock(sdata);
2187
2188 if (len < 24 + 6)
2189 return;
2190
2191 if (!ifmgd->auth_data || ifmgd->auth_data->done)
2192 return;
2193
2194 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2195
2196 if (!ether_addr_equal(bssid, mgmt->bssid))
2197 return;
2198
2199 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2200 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2201 status_code = le16_to_cpu(mgmt->u.auth.status_code);
2202
2203 if (auth_alg != ifmgd->auth_data->algorithm ||
2204 auth_transaction != ifmgd->auth_data->expected_transaction) {
2205 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2206 mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2207 auth_transaction,
2208 ifmgd->auth_data->expected_transaction);
2209 return;
2210 }
2211
2212 if (status_code != WLAN_STATUS_SUCCESS) {
2213 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2214 mgmt->sa, status_code);
2215 ieee80211_destroy_auth_data(sdata, false);
2216 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2217 return;
2218 }
2219
2220 switch (ifmgd->auth_data->algorithm) {
2221 case WLAN_AUTH_OPEN:
2222 case WLAN_AUTH_LEAP:
2223 case WLAN_AUTH_FT:
2224 case WLAN_AUTH_SAE:
2225 break;
2226 case WLAN_AUTH_SHARED_KEY:
2227 if (ifmgd->auth_data->expected_transaction != 4) {
2228 ieee80211_auth_challenge(sdata, mgmt, len);
2229 /* need another frame */
2230 return;
2231 }
2232 break;
2233 default:
2234 WARN_ONCE(1, "invalid auth alg %d",
2235 ifmgd->auth_data->algorithm);
2236 return;
2237 }
2238
2239 sdata_info(sdata, "authenticated\n");
2240 ifmgd->auth_data->done = true;
2241 ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2242 ifmgd->auth_data->timeout_started = true;
2243 run_again(sdata, ifmgd->auth_data->timeout);
2244
2245 if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2246 ifmgd->auth_data->expected_transaction != 2) {
2247 /*
2248 * Report auth frame to user space for processing since another
2249 * round of Authentication frames is still needed.
2250 */
2251 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2252 return;
2253 }
2254
2255 /* move station state to auth */
2256 mutex_lock(&sdata->local->sta_mtx);
2257 sta = sta_info_get(sdata, bssid);
2258 if (!sta) {
2259 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2260 goto out_err;
2261 }
2262 if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2263 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2264 goto out_err;
2265 }
2266 mutex_unlock(&sdata->local->sta_mtx);
2267
2268 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2269 return;
2270 out_err:
2271 mutex_unlock(&sdata->local->sta_mtx);
2272 /* ignore frame -- wait for timeout */
2273 }
2274
2275 #define case_WLAN(type) \
2276 case WLAN_REASON_##type: return #type
2277
2278 static const char *ieee80211_get_reason_code_string(u16 reason_code)
2279 {
2280 switch (reason_code) {
2281 case_WLAN(UNSPECIFIED);
2282 case_WLAN(PREV_AUTH_NOT_VALID);
2283 case_WLAN(DEAUTH_LEAVING);
2284 case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2285 case_WLAN(DISASSOC_AP_BUSY);
2286 case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2287 case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2288 case_WLAN(DISASSOC_STA_HAS_LEFT);
2289 case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2290 case_WLAN(DISASSOC_BAD_POWER);
2291 case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2292 case_WLAN(INVALID_IE);
2293 case_WLAN(MIC_FAILURE);
2294 case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2295 case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2296 case_WLAN(IE_DIFFERENT);
2297 case_WLAN(INVALID_GROUP_CIPHER);
2298 case_WLAN(INVALID_PAIRWISE_CIPHER);
2299 case_WLAN(INVALID_AKMP);
2300 case_WLAN(UNSUPP_RSN_VERSION);
2301 case_WLAN(INVALID_RSN_IE_CAP);
2302 case_WLAN(IEEE8021X_FAILED);
2303 case_WLAN(CIPHER_SUITE_REJECTED);
2304 case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2305 case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2306 case_WLAN(DISASSOC_LOW_ACK);
2307 case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2308 case_WLAN(QSTA_LEAVE_QBSS);
2309 case_WLAN(QSTA_NOT_USE);
2310 case_WLAN(QSTA_REQUIRE_SETUP);
2311 case_WLAN(QSTA_TIMEOUT);
2312 case_WLAN(QSTA_CIPHER_NOT_SUPP);
2313 case_WLAN(MESH_PEER_CANCELED);
2314 case_WLAN(MESH_MAX_PEERS);
2315 case_WLAN(MESH_CONFIG);
2316 case_WLAN(MESH_CLOSE);
2317 case_WLAN(MESH_MAX_RETRIES);
2318 case_WLAN(MESH_CONFIRM_TIMEOUT);
2319 case_WLAN(MESH_INVALID_GTK);
2320 case_WLAN(MESH_INCONSISTENT_PARAM);
2321 case_WLAN(MESH_INVALID_SECURITY);
2322 case_WLAN(MESH_PATH_ERROR);
2323 case_WLAN(MESH_PATH_NOFORWARD);
2324 case_WLAN(MESH_PATH_DEST_UNREACHABLE);
2325 case_WLAN(MAC_EXISTS_IN_MBSS);
2326 case_WLAN(MESH_CHAN_REGULATORY);
2327 case_WLAN(MESH_CHAN);
2328 default: return "<unknown>";
2329 }
2330 }
2331
2332 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2333 struct ieee80211_mgmt *mgmt, size_t len)
2334 {
2335 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2336 const u8 *bssid = NULL;
2337 u16 reason_code;
2338
2339 sdata_assert_lock(sdata);
2340
2341 if (len < 24 + 2)
2342 return;
2343
2344 if (!ifmgd->associated ||
2345 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2346 return;
2347
2348 bssid = ifmgd->associated->bssid;
2349
2350 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2351
2352 sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
2353 bssid, reason_code, ieee80211_get_reason_code_string(reason_code));
2354
2355 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2356
2357 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2358 }
2359
2360
2361 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2362 struct ieee80211_mgmt *mgmt, size_t len)
2363 {
2364 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2365 u16 reason_code;
2366
2367 sdata_assert_lock(sdata);
2368
2369 if (len < 24 + 2)
2370 return;
2371
2372 if (!ifmgd->associated ||
2373 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2374 return;
2375
2376 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2377
2378 sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2379 mgmt->sa, reason_code);
2380
2381 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2382
2383 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2384 }
2385
2386 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2387 u8 *supp_rates, unsigned int supp_rates_len,
2388 u32 *rates, u32 *basic_rates,
2389 bool *have_higher_than_11mbit,
2390 int *min_rate, int *min_rate_index,
2391 int shift, u32 rate_flags)
2392 {
2393 int i, j;
2394
2395 for (i = 0; i < supp_rates_len; i++) {
2396 int rate = supp_rates[i] & 0x7f;
2397 bool is_basic = !!(supp_rates[i] & 0x80);
2398
2399 if ((rate * 5 * (1 << shift)) > 110)
2400 *have_higher_than_11mbit = true;
2401
2402 /*
2403 * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2404 * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2405 *
2406 * Note: Even through the membership selector and the basic
2407 * rate flag share the same bit, they are not exactly
2408 * the same.
2409 */
2410 if (!!(supp_rates[i] & 0x80) &&
2411 (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2412 continue;
2413
2414 for (j = 0; j < sband->n_bitrates; j++) {
2415 struct ieee80211_rate *br;
2416 int brate;
2417
2418 br = &sband->bitrates[j];
2419 if ((rate_flags & br->flags) != rate_flags)
2420 continue;
2421
2422 brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2423 if (brate == rate) {
2424 *rates |= BIT(j);
2425 if (is_basic)
2426 *basic_rates |= BIT(j);
2427 if ((rate * 5) < *min_rate) {
2428 *min_rate = rate * 5;
2429 *min_rate_index = j;
2430 }
2431 break;
2432 }
2433 }
2434 }
2435 }
2436
2437 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2438 bool assoc)
2439 {
2440 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2441
2442 sdata_assert_lock(sdata);
2443
2444 if (!assoc) {
2445 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2446
2447 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2448 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2449 sdata->u.mgd.flags = 0;
2450 mutex_lock(&sdata->local->mtx);
2451 ieee80211_vif_release_channel(sdata);
2452 mutex_unlock(&sdata->local->mtx);
2453 }
2454
2455 kfree(assoc_data);
2456 sdata->u.mgd.assoc_data = NULL;
2457 }
2458
2459 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2460 struct cfg80211_bss *cbss,
2461 struct ieee80211_mgmt *mgmt, size_t len)
2462 {
2463 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2464 struct ieee80211_local *local = sdata->local;
2465 struct ieee80211_supported_band *sband;
2466 struct sta_info *sta;
2467 u8 *pos;
2468 u16 capab_info, aid;
2469 struct ieee802_11_elems elems;
2470 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2471 const struct cfg80211_bss_ies *bss_ies = NULL;
2472 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2473 u32 changed = 0;
2474 int err;
2475 bool ret;
2476
2477 /* AssocResp and ReassocResp have identical structure */
2478
2479 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2480 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2481
2482 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2483 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2484 aid);
2485 aid &= ~(BIT(15) | BIT(14));
2486
2487 ifmgd->broken_ap = false;
2488
2489 if (aid == 0 || aid > IEEE80211_MAX_AID) {
2490 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2491 aid);
2492 aid = 0;
2493 ifmgd->broken_ap = true;
2494 }
2495
2496 pos = mgmt->u.assoc_resp.variable;
2497 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2498
2499 if (!elems.supp_rates) {
2500 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2501 return false;
2502 }
2503
2504 ifmgd->aid = aid;
2505
2506 /*
2507 * Some APs are erroneously not including some information in their
2508 * (re)association response frames. Try to recover by using the data
2509 * from the beacon or probe response. This seems to afflict mobile
2510 * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2511 * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2512 */
2513 if ((assoc_data->wmm && !elems.wmm_param) ||
2514 (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2515 (!elems.ht_cap_elem || !elems.ht_operation)) ||
2516 (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2517 (!elems.vht_cap_elem || !elems.vht_operation))) {
2518 const struct cfg80211_bss_ies *ies;
2519 struct ieee802_11_elems bss_elems;
2520
2521 rcu_read_lock();
2522 ies = rcu_dereference(cbss->ies);
2523 if (ies)
2524 bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2525 GFP_ATOMIC);
2526 rcu_read_unlock();
2527 if (!bss_ies)
2528 return false;
2529
2530 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2531 false, &bss_elems);
2532 if (assoc_data->wmm &&
2533 !elems.wmm_param && bss_elems.wmm_param) {
2534 elems.wmm_param = bss_elems.wmm_param;
2535 sdata_info(sdata,
2536 "AP bug: WMM param missing from AssocResp\n");
2537 }
2538
2539 /*
2540 * Also check if we requested HT/VHT, otherwise the AP doesn't
2541 * have to include the IEs in the (re)association response.
2542 */
2543 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2544 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2545 elems.ht_cap_elem = bss_elems.ht_cap_elem;
2546 sdata_info(sdata,
2547 "AP bug: HT capability missing from AssocResp\n");
2548 }
2549 if (!elems.ht_operation && bss_elems.ht_operation &&
2550 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2551 elems.ht_operation = bss_elems.ht_operation;
2552 sdata_info(sdata,
2553 "AP bug: HT operation missing from AssocResp\n");
2554 }
2555 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2556 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2557 elems.vht_cap_elem = bss_elems.vht_cap_elem;
2558 sdata_info(sdata,
2559 "AP bug: VHT capa missing from AssocResp\n");
2560 }
2561 if (!elems.vht_operation && bss_elems.vht_operation &&
2562 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2563 elems.vht_operation = bss_elems.vht_operation;
2564 sdata_info(sdata,
2565 "AP bug: VHT operation missing from AssocResp\n");
2566 }
2567 }
2568
2569 /*
2570 * We previously checked these in the beacon/probe response, so
2571 * they should be present here. This is just a safety net.
2572 */
2573 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2574 (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2575 sdata_info(sdata,
2576 "HT AP is missing WMM params or HT capability/operation\n");
2577 ret = false;
2578 goto out;
2579 }
2580
2581 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2582 (!elems.vht_cap_elem || !elems.vht_operation)) {
2583 sdata_info(sdata,
2584 "VHT AP is missing VHT capability/operation\n");
2585 ret = false;
2586 goto out;
2587 }
2588
2589 mutex_lock(&sdata->local->sta_mtx);
2590 /*
2591 * station info was already allocated and inserted before
2592 * the association and should be available to us
2593 */
2594 sta = sta_info_get(sdata, cbss->bssid);
2595 if (WARN_ON(!sta)) {
2596 mutex_unlock(&sdata->local->sta_mtx);
2597 ret = false;
2598 goto out;
2599 }
2600
2601 sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2602
2603 /* Set up internal HT/VHT capabilities */
2604 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2605 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2606 elems.ht_cap_elem, sta);
2607
2608 if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
2609 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2610 elems.vht_cap_elem, sta);
2611
2612 /*
2613 * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
2614 * in their association response, so ignore that data for our own
2615 * configuration. If it changed since the last beacon, we'll get the
2616 * next beacon and update then.
2617 */
2618
2619 /*
2620 * If an operating mode notification IE is present, override the
2621 * NSS calculation (that would be done in rate_control_rate_init())
2622 * and use the # of streams from that element.
2623 */
2624 if (elems.opmode_notif &&
2625 !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
2626 u8 nss;
2627
2628 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
2629 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
2630 nss += 1;
2631 sta->sta.rx_nss = nss;
2632 }
2633
2634 rate_control_rate_init(sta);
2635
2636 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2637 set_sta_flag(sta, WLAN_STA_MFP);
2638
2639 if (elems.wmm_param)
2640 set_sta_flag(sta, WLAN_STA_WME);
2641
2642 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2643 if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2644 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2645 if (err) {
2646 sdata_info(sdata,
2647 "failed to move station %pM to desired state\n",
2648 sta->sta.addr);
2649 WARN_ON(__sta_info_destroy(sta));
2650 mutex_unlock(&sdata->local->sta_mtx);
2651 ret = false;
2652 goto out;
2653 }
2654
2655 mutex_unlock(&sdata->local->sta_mtx);
2656
2657 /*
2658 * Always handle WMM once after association regardless
2659 * of the first value the AP uses. Setting -1 here has
2660 * that effect because the AP values is an unsigned
2661 * 4-bit value.
2662 */
2663 ifmgd->wmm_last_param_set = -1;
2664
2665 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && elems.wmm_param)
2666 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2667 elems.wmm_param_len);
2668 else
2669 ieee80211_set_wmm_default(sdata, false);
2670 changed |= BSS_CHANGED_QOS;
2671
2672 /* set AID and assoc capability,
2673 * ieee80211_set_associated() will tell the driver */
2674 bss_conf->aid = aid;
2675 bss_conf->assoc_capability = capab_info;
2676 ieee80211_set_associated(sdata, cbss, changed);
2677
2678 /*
2679 * If we're using 4-addr mode, let the AP know that we're
2680 * doing so, so that it can create the STA VLAN on its side
2681 */
2682 if (ifmgd->use_4addr)
2683 ieee80211_send_4addr_nullfunc(local, sdata);
2684
2685 /*
2686 * Start timer to probe the connection to the AP now.
2687 * Also start the timer that will detect beacon loss.
2688 */
2689 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2690 ieee80211_sta_reset_beacon_monitor(sdata);
2691
2692 ret = true;
2693 out:
2694 kfree(bss_ies);
2695 return ret;
2696 }
2697
2698 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2699 struct ieee80211_mgmt *mgmt,
2700 size_t len)
2701 {
2702 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2703 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2704 u16 capab_info, status_code, aid;
2705 struct ieee802_11_elems elems;
2706 u8 *pos;
2707 bool reassoc;
2708 struct cfg80211_bss *bss;
2709
2710 sdata_assert_lock(sdata);
2711
2712 if (!assoc_data)
2713 return;
2714 if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2715 return;
2716
2717 /*
2718 * AssocResp and ReassocResp have identical structure, so process both
2719 * of them in this function.
2720 */
2721
2722 if (len < 24 + 6)
2723 return;
2724
2725 reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2726 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2727 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2728 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2729
2730 sdata_info(sdata,
2731 "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
2732 reassoc ? "Rea" : "A", mgmt->sa,
2733 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2734
2735 pos = mgmt->u.assoc_resp.variable;
2736 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2737
2738 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2739 elems.timeout_int &&
2740 elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2741 u32 tu, ms;
2742 tu = le32_to_cpu(elems.timeout_int->value);
2743 ms = tu * 1024 / 1000;
2744 sdata_info(sdata,
2745 "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
2746 mgmt->sa, tu, ms);
2747 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2748 assoc_data->timeout_started = true;
2749 if (ms > IEEE80211_ASSOC_TIMEOUT)
2750 run_again(sdata, assoc_data->timeout);
2751 return;
2752 }
2753
2754 bss = assoc_data->bss;
2755
2756 if (status_code != WLAN_STATUS_SUCCESS) {
2757 sdata_info(sdata, "%pM denied association (code=%d)\n",
2758 mgmt->sa, status_code);
2759 ieee80211_destroy_assoc_data(sdata, false);
2760 } else {
2761 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
2762 /* oops -- internal error -- send timeout for now */
2763 ieee80211_destroy_assoc_data(sdata, false);
2764 cfg80211_assoc_timeout(sdata->dev, bss);
2765 return;
2766 }
2767 sdata_info(sdata, "associated\n");
2768
2769 /*
2770 * destroy assoc_data afterwards, as otherwise an idle
2771 * recalc after assoc_data is NULL but before associated
2772 * is set can cause the interface to go idle
2773 */
2774 ieee80211_destroy_assoc_data(sdata, true);
2775 }
2776
2777 cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len);
2778 }
2779
2780 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2781 struct ieee80211_mgmt *mgmt, size_t len,
2782 struct ieee80211_rx_status *rx_status,
2783 struct ieee802_11_elems *elems)
2784 {
2785 struct ieee80211_local *local = sdata->local;
2786 struct ieee80211_bss *bss;
2787 struct ieee80211_channel *channel;
2788
2789 sdata_assert_lock(sdata);
2790
2791 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
2792 if (!channel)
2793 return;
2794
2795 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2796 channel);
2797 if (bss) {
2798 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
2799 ieee80211_rx_bss_put(local, bss);
2800 }
2801 }
2802
2803
2804 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2805 struct sk_buff *skb)
2806 {
2807 struct ieee80211_mgmt *mgmt = (void *)skb->data;
2808 struct ieee80211_if_managed *ifmgd;
2809 struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2810 size_t baselen, len = skb->len;
2811 struct ieee802_11_elems elems;
2812
2813 ifmgd = &sdata->u.mgd;
2814
2815 sdata_assert_lock(sdata);
2816
2817 if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2818 return; /* ignore ProbeResp to foreign address */
2819
2820 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2821 if (baselen > len)
2822 return;
2823
2824 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2825 false, &elems);
2826
2827 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2828
2829 if (ifmgd->associated &&
2830 ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2831 ieee80211_reset_ap_probe(sdata);
2832
2833 if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2834 ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
2835 /* got probe response, continue with auth */
2836 sdata_info(sdata, "direct probe responded\n");
2837 ifmgd->auth_data->tries = 0;
2838 ifmgd->auth_data->timeout = jiffies;
2839 ifmgd->auth_data->timeout_started = true;
2840 run_again(sdata, ifmgd->auth_data->timeout);
2841 }
2842 }
2843
2844 /*
2845 * This is the canonical list of information elements we care about,
2846 * the filter code also gives us all changes to the Microsoft OUI
2847 * (00:50:F2) vendor IE which is used for WMM which we need to track.
2848 *
2849 * We implement beacon filtering in software since that means we can
2850 * avoid processing the frame here and in cfg80211, and userspace
2851 * will not be able to tell whether the hardware supports it or not.
2852 *
2853 * XXX: This list needs to be dynamic -- userspace needs to be able to
2854 * add items it requires. It also needs to be able to tell us to
2855 * look out for other vendor IEs.
2856 */
2857 static const u64 care_about_ies =
2858 (1ULL << WLAN_EID_COUNTRY) |
2859 (1ULL << WLAN_EID_ERP_INFO) |
2860 (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2861 (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2862 (1ULL << WLAN_EID_HT_CAPABILITY) |
2863 (1ULL << WLAN_EID_HT_OPERATION);
2864
2865 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2866 struct ieee80211_mgmt *mgmt, size_t len,
2867 struct ieee80211_rx_status *rx_status)
2868 {
2869 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2870 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2871 size_t baselen;
2872 struct ieee802_11_elems elems;
2873 struct ieee80211_local *local = sdata->local;
2874 struct ieee80211_chanctx_conf *chanctx_conf;
2875 struct ieee80211_channel *chan;
2876 struct sta_info *sta;
2877 u32 changed = 0;
2878 bool erp_valid;
2879 u8 erp_value = 0;
2880 u32 ncrc;
2881 u8 *bssid;
2882 u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
2883
2884 sdata_assert_lock(sdata);
2885
2886 /* Process beacon from the current BSS */
2887 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2888 if (baselen > len)
2889 return;
2890
2891 rcu_read_lock();
2892 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2893 if (!chanctx_conf) {
2894 rcu_read_unlock();
2895 return;
2896 }
2897
2898 if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
2899 rcu_read_unlock();
2900 return;
2901 }
2902 chan = chanctx_conf->def.chan;
2903 rcu_read_unlock();
2904
2905 if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
2906 ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2907 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2908 len - baselen, false, &elems);
2909
2910 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2911 if (elems.tim && !elems.parse_error) {
2912 const struct ieee80211_tim_ie *tim_ie = elems.tim;
2913 ifmgd->dtim_period = tim_ie->dtim_period;
2914 }
2915 ifmgd->have_beacon = true;
2916 ifmgd->assoc_data->need_beacon = false;
2917 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
2918 sdata->vif.bss_conf.sync_tsf =
2919 le64_to_cpu(mgmt->u.beacon.timestamp);
2920 sdata->vif.bss_conf.sync_device_ts =
2921 rx_status->device_timestamp;
2922 if (elems.tim)
2923 sdata->vif.bss_conf.sync_dtim_count =
2924 elems.tim->dtim_count;
2925 else
2926 sdata->vif.bss_conf.sync_dtim_count = 0;
2927 }
2928 /* continue assoc process */
2929 ifmgd->assoc_data->timeout = jiffies;
2930 ifmgd->assoc_data->timeout_started = true;
2931 run_again(sdata, ifmgd->assoc_data->timeout);
2932 return;
2933 }
2934
2935 if (!ifmgd->associated ||
2936 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2937 return;
2938 bssid = ifmgd->associated->bssid;
2939
2940 /* Track average RSSI from the Beacon frames of the current AP */
2941 ifmgd->last_beacon_signal = rx_status->signal;
2942 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2943 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2944 ifmgd->ave_beacon_signal = rx_status->signal * 16;
2945 ifmgd->last_cqm_event_signal = 0;
2946 ifmgd->count_beacon_signal = 1;
2947 ifmgd->last_ave_beacon_signal = 0;
2948 } else {
2949 ifmgd->ave_beacon_signal =
2950 (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
2951 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
2952 ifmgd->ave_beacon_signal) / 16;
2953 ifmgd->count_beacon_signal++;
2954 }
2955
2956 if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
2957 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
2958 int sig = ifmgd->ave_beacon_signal;
2959 int last_sig = ifmgd->last_ave_beacon_signal;
2960
2961 /*
2962 * if signal crosses either of the boundaries, invoke callback
2963 * with appropriate parameters
2964 */
2965 if (sig > ifmgd->rssi_max_thold &&
2966 (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
2967 ifmgd->last_ave_beacon_signal = sig;
2968 drv_rssi_callback(local, sdata, RSSI_EVENT_HIGH);
2969 } else if (sig < ifmgd->rssi_min_thold &&
2970 (last_sig >= ifmgd->rssi_max_thold ||
2971 last_sig == 0)) {
2972 ifmgd->last_ave_beacon_signal = sig;
2973 drv_rssi_callback(local, sdata, RSSI_EVENT_LOW);
2974 }
2975 }
2976
2977 if (bss_conf->cqm_rssi_thold &&
2978 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
2979 !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
2980 int sig = ifmgd->ave_beacon_signal / 16;
2981 int last_event = ifmgd->last_cqm_event_signal;
2982 int thold = bss_conf->cqm_rssi_thold;
2983 int hyst = bss_conf->cqm_rssi_hyst;
2984 if (sig < thold &&
2985 (last_event == 0 || sig < last_event - hyst)) {
2986 ifmgd->last_cqm_event_signal = sig;
2987 ieee80211_cqm_rssi_notify(
2988 &sdata->vif,
2989 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
2990 GFP_KERNEL);
2991 } else if (sig > thold &&
2992 (last_event == 0 || sig > last_event + hyst)) {
2993 ifmgd->last_cqm_event_signal = sig;
2994 ieee80211_cqm_rssi_notify(
2995 &sdata->vif,
2996 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
2997 GFP_KERNEL);
2998 }
2999 }
3000
3001 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3002 mlme_dbg_ratelimited(sdata,
3003 "cancelling AP probe due to a received beacon\n");
3004 ieee80211_reset_ap_probe(sdata);
3005 }
3006
3007 /*
3008 * Push the beacon loss detection into the future since
3009 * we are processing a beacon from the AP just now.
3010 */
3011 ieee80211_sta_reset_beacon_monitor(sdata);
3012
3013 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3014 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3015 len - baselen, false, &elems,
3016 care_about_ies, ncrc);
3017
3018 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
3019 bool directed_tim = ieee80211_check_tim(elems.tim,
3020 elems.tim_len,
3021 ifmgd->aid);
3022 if (directed_tim) {
3023 if (local->hw.conf.dynamic_ps_timeout > 0) {
3024 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3025 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3026 ieee80211_hw_config(local,
3027 IEEE80211_CONF_CHANGE_PS);
3028 }
3029 ieee80211_send_nullfunc(local, sdata, 0);
3030 } else if (!local->pspolling && sdata->u.mgd.powersave) {
3031 local->pspolling = true;
3032
3033 /*
3034 * Here is assumed that the driver will be
3035 * able to send ps-poll frame and receive a
3036 * response even though power save mode is
3037 * enabled, but some drivers might require
3038 * to disable power save here. This needs
3039 * to be investigated.
3040 */
3041 ieee80211_send_pspoll(local, sdata);
3042 }
3043 }
3044 }
3045
3046 if (sdata->vif.p2p) {
3047 struct ieee80211_p2p_noa_attr noa = {};
3048 int ret;
3049
3050 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3051 len - baselen,
3052 IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3053 (u8 *) &noa, sizeof(noa));
3054 if (ret >= 2) {
3055 if (sdata->u.mgd.p2p_noa_index != noa.index) {
3056 /* valid noa_attr and index changed */
3057 sdata->u.mgd.p2p_noa_index = noa.index;
3058 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3059 changed |= BSS_CHANGED_P2P_PS;
3060 /*
3061 * make sure we update all information, the CRC
3062 * mechanism doesn't look at P2P attributes.
3063 */
3064 ifmgd->beacon_crc_valid = false;
3065 }
3066 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3067 /* noa_attr not found and we had valid noa_attr before */
3068 sdata->u.mgd.p2p_noa_index = -1;
3069 memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3070 changed |= BSS_CHANGED_P2P_PS;
3071 ifmgd->beacon_crc_valid = false;
3072 }
3073 }
3074
3075 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3076 return;
3077 ifmgd->beacon_crc = ncrc;
3078 ifmgd->beacon_crc_valid = true;
3079
3080 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3081
3082 ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3083 &elems, true);
3084
3085 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3086 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3087 elems.wmm_param_len))
3088 changed |= BSS_CHANGED_QOS;
3089
3090 /*
3091 * If we haven't had a beacon before, tell the driver about the
3092 * DTIM period (and beacon timing if desired) now.
3093 */
3094 if (!ifmgd->have_beacon) {
3095 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3096 if (elems.tim)
3097 bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3098 else
3099 bss_conf->dtim_period = 1;
3100
3101 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
3102 sdata->vif.bss_conf.sync_tsf =
3103 le64_to_cpu(mgmt->u.beacon.timestamp);
3104 sdata->vif.bss_conf.sync_device_ts =
3105 rx_status->device_timestamp;
3106 if (elems.tim)
3107 sdata->vif.bss_conf.sync_dtim_count =
3108 elems.tim->dtim_count;
3109 else
3110 sdata->vif.bss_conf.sync_dtim_count = 0;
3111 }
3112
3113 changed |= BSS_CHANGED_BEACON_INFO;
3114 ifmgd->have_beacon = true;
3115
3116 mutex_lock(&local->iflist_mtx);
3117 ieee80211_recalc_ps(local, -1);
3118 mutex_unlock(&local->iflist_mtx);
3119
3120 ieee80211_recalc_ps_vif(sdata);
3121 }
3122
3123 if (elems.erp_info) {
3124 erp_valid = true;
3125 erp_value = elems.erp_info[0];
3126 } else {
3127 erp_valid = false;
3128 }
3129 changed |= ieee80211_handle_bss_capability(sdata,
3130 le16_to_cpu(mgmt->u.beacon.capab_info),
3131 erp_valid, erp_value);
3132
3133 mutex_lock(&local->sta_mtx);
3134 sta = sta_info_get(sdata, bssid);
3135
3136 if (ieee80211_config_bw(sdata, sta, elems.ht_operation,
3137 elems.vht_operation, bssid, &changed)) {
3138 mutex_unlock(&local->sta_mtx);
3139 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3140 WLAN_REASON_DEAUTH_LEAVING,
3141 true, deauth_buf);
3142 cfg80211_tx_mlme_mgmt(sdata->dev, deauth_buf,
3143 sizeof(deauth_buf));
3144 return;
3145 }
3146
3147 if (sta && elems.opmode_notif)
3148 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3149 rx_status->band, true);
3150 mutex_unlock(&local->sta_mtx);
3151
3152 if (elems.country_elem && elems.pwr_constr_elem &&
3153 mgmt->u.probe_resp.capab_info &
3154 cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT))
3155 changed |= ieee80211_handle_pwr_constr(sdata, chan,
3156 elems.country_elem,
3157 elems.country_elem_len,
3158 elems.pwr_constr_elem);
3159
3160 ieee80211_bss_info_change_notify(sdata, changed);
3161 }
3162
3163 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3164 struct sk_buff *skb)
3165 {
3166 struct ieee80211_rx_status *rx_status;
3167 struct ieee80211_mgmt *mgmt;
3168 u16 fc;
3169 struct ieee802_11_elems elems;
3170 int ies_len;
3171
3172 rx_status = (struct ieee80211_rx_status *) skb->cb;
3173 mgmt = (struct ieee80211_mgmt *) skb->data;
3174 fc = le16_to_cpu(mgmt->frame_control);
3175
3176 sdata_lock(sdata);
3177
3178 switch (fc & IEEE80211_FCTL_STYPE) {
3179 case IEEE80211_STYPE_BEACON:
3180 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3181 break;
3182 case IEEE80211_STYPE_PROBE_RESP:
3183 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3184 break;
3185 case IEEE80211_STYPE_AUTH:
3186 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3187 break;
3188 case IEEE80211_STYPE_DEAUTH:
3189 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3190 break;
3191 case IEEE80211_STYPE_DISASSOC:
3192 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3193 break;
3194 case IEEE80211_STYPE_ASSOC_RESP:
3195 case IEEE80211_STYPE_REASSOC_RESP:
3196 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3197 break;
3198 case IEEE80211_STYPE_ACTION:
3199 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3200 ies_len = skb->len -
3201 offsetof(struct ieee80211_mgmt,
3202 u.action.u.chan_switch.variable);
3203
3204 if (ies_len < 0)
3205 break;
3206
3207 ieee802_11_parse_elems(
3208 mgmt->u.action.u.chan_switch.variable,
3209 ies_len, true, &elems);
3210
3211 if (elems.parse_error)
3212 break;
3213
3214 ieee80211_sta_process_chanswitch(sdata,
3215 rx_status->mactime,
3216 &elems, false);
3217 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3218 ies_len = skb->len -
3219 offsetof(struct ieee80211_mgmt,
3220 u.action.u.ext_chan_switch.variable);
3221
3222 if (ies_len < 0)
3223 break;
3224
3225 ieee802_11_parse_elems(
3226 mgmt->u.action.u.ext_chan_switch.variable,
3227 ies_len, true, &elems);
3228
3229 if (elems.parse_error)
3230 break;
3231
3232 /* for the handling code pretend this was also an IE */
3233 elems.ext_chansw_ie =
3234 &mgmt->u.action.u.ext_chan_switch.data;
3235
3236 ieee80211_sta_process_chanswitch(sdata,
3237 rx_status->mactime,
3238 &elems, false);
3239 }
3240 break;
3241 }
3242 sdata_unlock(sdata);
3243 }
3244
3245 static void ieee80211_sta_timer(unsigned long data)
3246 {
3247 struct ieee80211_sub_if_data *sdata =
3248 (struct ieee80211_sub_if_data *) data;
3249
3250 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3251 }
3252
3253 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3254 u8 *bssid, u8 reason, bool tx)
3255 {
3256 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3257
3258 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3259 tx, frame_buf);
3260
3261 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
3262 IEEE80211_DEAUTH_FRAME_LEN);
3263 }
3264
3265 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
3266 {
3267 struct ieee80211_local *local = sdata->local;
3268 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3269 struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3270 u32 tx_flags = 0;
3271
3272 sdata_assert_lock(sdata);
3273
3274 if (WARN_ON_ONCE(!auth_data))
3275 return -EINVAL;
3276
3277 auth_data->tries++;
3278
3279 if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3280 sdata_info(sdata, "authentication with %pM timed out\n",
3281 auth_data->bss->bssid);
3282
3283 /*
3284 * Most likely AP is not in the range so remove the
3285 * bss struct for that AP.
3286 */
3287 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3288
3289 return -ETIMEDOUT;
3290 }
3291
3292 drv_mgd_prepare_tx(local, sdata);
3293
3294 if (auth_data->bss->proberesp_ies) {
3295 u16 trans = 1;
3296 u16 status = 0;
3297
3298 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3299 auth_data->bss->bssid, auth_data->tries,
3300 IEEE80211_AUTH_MAX_TRIES);
3301
3302 auth_data->expected_transaction = 2;
3303
3304 if (auth_data->algorithm == WLAN_AUTH_SAE) {
3305 trans = auth_data->sae_trans;
3306 status = auth_data->sae_status;
3307 auth_data->expected_transaction = trans;
3308 }
3309
3310 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3311 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3312 IEEE80211_TX_INTFL_MLME_CONN_TX;
3313
3314 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3315 auth_data->data, auth_data->data_len,
3316 auth_data->bss->bssid,
3317 auth_data->bss->bssid, NULL, 0, 0,
3318 tx_flags);
3319 } else {
3320 const u8 *ssidie;
3321
3322 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
3323 auth_data->bss->bssid, auth_data->tries,
3324 IEEE80211_AUTH_MAX_TRIES);
3325
3326 rcu_read_lock();
3327 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
3328 if (!ssidie) {
3329 rcu_read_unlock();
3330 return -EINVAL;
3331 }
3332 /*
3333 * Direct probe is sent to broadcast address as some APs
3334 * will not answer to direct packet in unassociated state.
3335 */
3336 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
3337 NULL, 0, (u32) -1, true, 0,
3338 auth_data->bss->channel, false);
3339 rcu_read_unlock();
3340 }
3341
3342 if (tx_flags == 0) {
3343 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3344 auth_data->timeout_started = true;
3345 run_again(sdata, auth_data->timeout);
3346 } else {
3347 auth_data->timeout =
3348 round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3349 auth_data->timeout_started = true;
3350 run_again(sdata, auth_data->timeout);
3351 }
3352
3353 return 0;
3354 }
3355
3356 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3357 {
3358 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3359 struct ieee80211_local *local = sdata->local;
3360
3361 sdata_assert_lock(sdata);
3362
3363 assoc_data->tries++;
3364 if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3365 sdata_info(sdata, "association with %pM timed out\n",
3366 assoc_data->bss->bssid);
3367
3368 /*
3369 * Most likely AP is not in the range so remove the
3370 * bss struct for that AP.
3371 */
3372 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3373
3374 return -ETIMEDOUT;
3375 }
3376
3377 sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3378 assoc_data->bss->bssid, assoc_data->tries,
3379 IEEE80211_ASSOC_MAX_TRIES);
3380 ieee80211_send_assoc(sdata);
3381
3382 if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
3383 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3384 assoc_data->timeout_started = true;
3385 run_again(sdata, assoc_data->timeout);
3386 } else {
3387 assoc_data->timeout =
3388 round_jiffies_up(jiffies +
3389 IEEE80211_ASSOC_TIMEOUT_LONG);
3390 assoc_data->timeout_started = true;
3391 run_again(sdata, assoc_data->timeout);
3392 }
3393
3394 return 0;
3395 }
3396
3397 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3398 __le16 fc, bool acked)
3399 {
3400 struct ieee80211_local *local = sdata->local;
3401
3402 sdata->u.mgd.status_fc = fc;
3403 sdata->u.mgd.status_acked = acked;
3404 sdata->u.mgd.status_received = true;
3405
3406 ieee80211_queue_work(&local->hw, &sdata->work);
3407 }
3408
3409 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3410 {
3411 struct ieee80211_local *local = sdata->local;
3412 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3413
3414 sdata_lock(sdata);
3415
3416 if (ifmgd->status_received) {
3417 __le16 fc = ifmgd->status_fc;
3418 bool status_acked = ifmgd->status_acked;
3419
3420 ifmgd->status_received = false;
3421 if (ifmgd->auth_data &&
3422 (ieee80211_is_probe_req(fc) || ieee80211_is_auth(fc))) {
3423 if (status_acked) {
3424 ifmgd->auth_data->timeout =
3425 jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3426 run_again(sdata, ifmgd->auth_data->timeout);
3427 } else {
3428 ifmgd->auth_data->timeout = jiffies - 1;
3429 }
3430 ifmgd->auth_data->timeout_started = true;
3431 } else if (ifmgd->assoc_data &&
3432 (ieee80211_is_assoc_req(fc) ||
3433 ieee80211_is_reassoc_req(fc))) {
3434 if (status_acked) {
3435 ifmgd->assoc_data->timeout =
3436 jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3437 run_again(sdata, ifmgd->assoc_data->timeout);
3438 } else {
3439 ifmgd->assoc_data->timeout = jiffies - 1;
3440 }
3441 ifmgd->assoc_data->timeout_started = true;
3442 }
3443 }
3444
3445 if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3446 time_after(jiffies, ifmgd->auth_data->timeout)) {
3447 if (ifmgd->auth_data->done) {
3448 /*
3449 * ok ... we waited for assoc but userspace didn't,
3450 * so let's just kill the auth data
3451 */
3452 ieee80211_destroy_auth_data(sdata, false);
3453 } else if (ieee80211_probe_auth(sdata)) {
3454 u8 bssid[ETH_ALEN];
3455
3456 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3457
3458 ieee80211_destroy_auth_data(sdata, false);
3459
3460 cfg80211_auth_timeout(sdata->dev, bssid);
3461 }
3462 } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3463 run_again(sdata, ifmgd->auth_data->timeout);
3464
3465 if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3466 time_after(jiffies, ifmgd->assoc_data->timeout)) {
3467 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3468 ieee80211_do_assoc(sdata)) {
3469 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3470
3471 ieee80211_destroy_assoc_data(sdata, false);
3472 cfg80211_assoc_timeout(sdata->dev, bss);
3473 }
3474 } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3475 run_again(sdata, ifmgd->assoc_data->timeout);
3476
3477 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3478 ifmgd->associated) {
3479 u8 bssid[ETH_ALEN];
3480 int max_tries;
3481
3482 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3483
3484 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3485 max_tries = max_nullfunc_tries;
3486 else
3487 max_tries = max_probe_tries;
3488
3489 /* ACK received for nullfunc probing frame */
3490 if (!ifmgd->probe_send_count)
3491 ieee80211_reset_ap_probe(sdata);
3492 else if (ifmgd->nullfunc_failed) {
3493 if (ifmgd->probe_send_count < max_tries) {
3494 mlme_dbg(sdata,
3495 "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3496 bssid, ifmgd->probe_send_count,
3497 max_tries);
3498 ieee80211_mgd_probe_ap_send(sdata);
3499 } else {
3500 mlme_dbg(sdata,
3501 "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3502 bssid);
3503 ieee80211_sta_connection_lost(sdata, bssid,
3504 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3505 false);
3506 }
3507 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3508 run_again(sdata, ifmgd->probe_timeout);
3509 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
3510 mlme_dbg(sdata,
3511 "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3512 bssid, probe_wait_ms);
3513 ieee80211_sta_connection_lost(sdata, bssid,
3514 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3515 } else if (ifmgd->probe_send_count < max_tries) {
3516 mlme_dbg(sdata,
3517 "No probe response from AP %pM after %dms, try %d/%i\n",
3518 bssid, probe_wait_ms,
3519 ifmgd->probe_send_count, max_tries);
3520 ieee80211_mgd_probe_ap_send(sdata);
3521 } else {
3522 /*
3523 * We actually lost the connection ... or did we?
3524 * Let's make sure!
3525 */
3526 wiphy_debug(local->hw.wiphy,
3527 "%s: No probe response from AP %pM"
3528 " after %dms, disconnecting.\n",
3529 sdata->name,
3530 bssid, probe_wait_ms);
3531
3532 ieee80211_sta_connection_lost(sdata, bssid,
3533 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3534 }
3535 }
3536
3537 sdata_unlock(sdata);
3538 }
3539
3540 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3541 {
3542 struct ieee80211_sub_if_data *sdata =
3543 (struct ieee80211_sub_if_data *) data;
3544 struct ieee80211_local *local = sdata->local;
3545
3546 if (local->quiescing)
3547 return;
3548
3549 sdata->u.mgd.connection_loss = false;
3550 ieee80211_queue_work(&sdata->local->hw,
3551 &sdata->u.mgd.beacon_connection_loss_work);
3552 }
3553
3554 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3555 {
3556 struct ieee80211_sub_if_data *sdata =
3557 (struct ieee80211_sub_if_data *) data;
3558 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3559 struct ieee80211_local *local = sdata->local;
3560
3561 if (local->quiescing)
3562 return;
3563
3564 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3565 }
3566
3567 static void ieee80211_sta_monitor_work(struct work_struct *work)
3568 {
3569 struct ieee80211_sub_if_data *sdata =
3570 container_of(work, struct ieee80211_sub_if_data,
3571 u.mgd.monitor_work);
3572
3573 ieee80211_mgd_probe_ap(sdata, false);
3574 }
3575
3576 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3577 {
3578 u32 flags;
3579
3580 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3581 __ieee80211_stop_poll(sdata);
3582
3583 /* let's probe the connection once */
3584 flags = sdata->local->hw.flags;
3585 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
3586 ieee80211_queue_work(&sdata->local->hw,
3587 &sdata->u.mgd.monitor_work);
3588 /* and do all the other regular work too */
3589 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3590 }
3591 }
3592
3593 #ifdef CONFIG_PM
3594 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
3595 {
3596 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3597 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3598
3599 sdata_lock(sdata);
3600
3601 if (ifmgd->auth_data || ifmgd->assoc_data) {
3602 const u8 *bssid = ifmgd->auth_data ?
3603 ifmgd->auth_data->bss->bssid :
3604 ifmgd->assoc_data->bss->bssid;
3605
3606 /*
3607 * If we are trying to authenticate / associate while suspending,
3608 * cfg80211 won't know and won't actually abort those attempts,
3609 * thus we need to do that ourselves.
3610 */
3611 ieee80211_send_deauth_disassoc(sdata, bssid,
3612 IEEE80211_STYPE_DEAUTH,
3613 WLAN_REASON_DEAUTH_LEAVING,
3614 false, frame_buf);
3615 if (ifmgd->assoc_data)
3616 ieee80211_destroy_assoc_data(sdata, false);
3617 if (ifmgd->auth_data)
3618 ieee80211_destroy_auth_data(sdata, false);
3619 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
3620 IEEE80211_DEAUTH_FRAME_LEN);
3621 }
3622
3623 sdata_unlock(sdata);
3624 }
3625
3626 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
3627 {
3628 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3629
3630 sdata_lock(sdata);
3631 if (!ifmgd->associated) {
3632 sdata_unlock(sdata);
3633 return;
3634 }
3635
3636 if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
3637 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
3638 mlme_dbg(sdata, "driver requested disconnect after resume\n");
3639 ieee80211_sta_connection_lost(sdata,
3640 ifmgd->associated->bssid,
3641 WLAN_REASON_UNSPECIFIED,
3642 true);
3643 sdata_unlock(sdata);
3644 return;
3645 }
3646 sdata_unlock(sdata);
3647 }
3648 #endif
3649
3650 /* interface setup */
3651 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3652 {
3653 struct ieee80211_if_managed *ifmgd;
3654
3655 ifmgd = &sdata->u.mgd;
3656 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3657 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3658 INIT_WORK(&ifmgd->beacon_connection_loss_work,
3659 ieee80211_beacon_connection_loss_work);
3660 INIT_WORK(&ifmgd->csa_connection_drop_work,
3661 ieee80211_csa_connection_drop_work);
3662 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
3663 setup_timer(&ifmgd->timer, ieee80211_sta_timer,
3664 (unsigned long) sdata);
3665 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
3666 (unsigned long) sdata);
3667 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
3668 (unsigned long) sdata);
3669 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
3670 (unsigned long) sdata);
3671
3672 ifmgd->flags = 0;
3673 ifmgd->powersave = sdata->wdev.ps;
3674 ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
3675 ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
3676 ifmgd->p2p_noa_index = -1;
3677
3678 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
3679 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
3680 else
3681 ifmgd->req_smps = IEEE80211_SMPS_OFF;
3682 }
3683
3684 /* scan finished notification */
3685 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
3686 {
3687 struct ieee80211_sub_if_data *sdata;
3688
3689 /* Restart STA timers */
3690 rcu_read_lock();
3691 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3692 if (ieee80211_sdata_running(sdata))
3693 ieee80211_restart_sta_timer(sdata);
3694 }
3695 rcu_read_unlock();
3696 }
3697
3698 int ieee80211_max_network_latency(struct notifier_block *nb,
3699 unsigned long data, void *dummy)
3700 {
3701 s32 latency_usec = (s32) data;
3702 struct ieee80211_local *local =
3703 container_of(nb, struct ieee80211_local,
3704 network_latency_notifier);
3705
3706 mutex_lock(&local->iflist_mtx);
3707 ieee80211_recalc_ps(local, latency_usec);
3708 mutex_unlock(&local->iflist_mtx);
3709
3710 return 0;
3711 }
3712
3713 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
3714 struct cfg80211_bss *cbss)
3715 {
3716 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3717 const u8 *ht_cap_ie, *vht_cap_ie;
3718 const struct ieee80211_ht_cap *ht_cap;
3719 const struct ieee80211_vht_cap *vht_cap;
3720 u8 chains = 1;
3721
3722 if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
3723 return chains;
3724
3725 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
3726 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
3727 ht_cap = (void *)(ht_cap_ie + 2);
3728 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
3729 /*
3730 * TODO: use "Tx Maximum Number Spatial Streams Supported" and
3731 * "Tx Unequal Modulation Supported" fields.
3732 */
3733 }
3734
3735 if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
3736 return chains;
3737
3738 vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
3739 if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
3740 u8 nss;
3741 u16 tx_mcs_map;
3742
3743 vht_cap = (void *)(vht_cap_ie + 2);
3744 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
3745 for (nss = 8; nss > 0; nss--) {
3746 if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
3747 IEEE80211_VHT_MCS_NOT_SUPPORTED)
3748 break;
3749 }
3750 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
3751 chains = max(chains, nss);
3752 }
3753
3754 return chains;
3755 }
3756
3757 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
3758 struct cfg80211_bss *cbss)
3759 {
3760 struct ieee80211_local *local = sdata->local;
3761 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3762 const struct ieee80211_ht_operation *ht_oper = NULL;
3763 const struct ieee80211_vht_operation *vht_oper = NULL;
3764 struct ieee80211_supported_band *sband;
3765 struct cfg80211_chan_def chandef;
3766 int ret;
3767
3768 sband = local->hw.wiphy->bands[cbss->channel->band];
3769
3770 ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
3771 IEEE80211_STA_DISABLE_80P80MHZ |
3772 IEEE80211_STA_DISABLE_160MHZ);
3773
3774 rcu_read_lock();
3775
3776 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
3777 sband->ht_cap.ht_supported) {
3778 const u8 *ht_oper_ie, *ht_cap;
3779
3780 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
3781 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3782 ht_oper = (void *)(ht_oper_ie + 2);
3783
3784 ht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
3785 if (!ht_cap || ht_cap[1] < sizeof(struct ieee80211_ht_cap)) {
3786 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3787 ht_oper = NULL;
3788 }
3789 }
3790
3791 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
3792 sband->vht_cap.vht_supported) {
3793 const u8 *vht_oper_ie, *vht_cap;
3794
3795 vht_oper_ie = ieee80211_bss_get_ie(cbss,
3796 WLAN_EID_VHT_OPERATION);
3797 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
3798 vht_oper = (void *)(vht_oper_ie + 2);
3799 if (vht_oper && !ht_oper) {
3800 vht_oper = NULL;
3801 sdata_info(sdata,
3802 "AP advertised VHT without HT, disabling both\n");
3803 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3804 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3805 }
3806
3807 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
3808 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
3809 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3810 vht_oper = NULL;
3811 }
3812 }
3813
3814 ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
3815 cbss->channel,
3816 ht_oper, vht_oper,
3817 &chandef, false);
3818
3819 sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
3820 local->rx_chains);
3821
3822 rcu_read_unlock();
3823
3824 /* will change later if needed */
3825 sdata->smps_mode = IEEE80211_SMPS_OFF;
3826
3827 mutex_lock(&local->mtx);
3828 /*
3829 * If this fails (possibly due to channel context sharing
3830 * on incompatible channels, e.g. 80+80 and 160 sharing the
3831 * same control channel) try to use a smaller bandwidth.
3832 */
3833 ret = ieee80211_vif_use_channel(sdata, &chandef,
3834 IEEE80211_CHANCTX_SHARED);
3835
3836 /* don't downgrade for 5 and 10 MHz channels, though. */
3837 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
3838 chandef.width == NL80211_CHAN_WIDTH_10)
3839 goto out;
3840
3841 while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
3842 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
3843 ret = ieee80211_vif_use_channel(sdata, &chandef,
3844 IEEE80211_CHANCTX_SHARED);
3845 }
3846 out:
3847 mutex_unlock(&local->mtx);
3848 return ret;
3849 }
3850
3851 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3852 struct cfg80211_bss *cbss, bool assoc)
3853 {
3854 struct ieee80211_local *local = sdata->local;
3855 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3856 struct ieee80211_bss *bss = (void *)cbss->priv;
3857 struct sta_info *new_sta = NULL;
3858 bool have_sta = false;
3859 int err;
3860
3861 if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3862 return -EINVAL;
3863
3864 if (assoc) {
3865 rcu_read_lock();
3866 have_sta = sta_info_get(sdata, cbss->bssid);
3867 rcu_read_unlock();
3868 }
3869
3870 if (!have_sta) {
3871 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3872 if (!new_sta)
3873 return -ENOMEM;
3874 }
3875 if (new_sta) {
3876 u32 rates = 0, basic_rates = 0;
3877 bool have_higher_than_11mbit;
3878 int min_rate = INT_MAX, min_rate_index = -1;
3879 struct ieee80211_chanctx_conf *chanctx_conf;
3880 struct ieee80211_supported_band *sband;
3881 const struct cfg80211_bss_ies *ies;
3882 int shift;
3883 u32 rate_flags;
3884
3885 sband = local->hw.wiphy->bands[cbss->channel->band];
3886
3887 err = ieee80211_prep_channel(sdata, cbss);
3888 if (err) {
3889 sta_info_free(local, new_sta);
3890 return -EINVAL;
3891 }
3892 shift = ieee80211_vif_get_shift(&sdata->vif);
3893
3894 rcu_read_lock();
3895 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3896 if (WARN_ON(!chanctx_conf)) {
3897 rcu_read_unlock();
3898 sta_info_free(local, new_sta);
3899 return -EINVAL;
3900 }
3901 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
3902 rcu_read_unlock();
3903
3904 ieee80211_get_rates(sband, bss->supp_rates,
3905 bss->supp_rates_len,
3906 &rates, &basic_rates,
3907 &have_higher_than_11mbit,
3908 &min_rate, &min_rate_index,
3909 shift, rate_flags);
3910
3911 /*
3912 * This used to be a workaround for basic rates missing
3913 * in the association response frame. Now that we no
3914 * longer use the basic rates from there, it probably
3915 * doesn't happen any more, but keep the workaround so
3916 * in case some *other* APs are buggy in different ways
3917 * we can connect -- with a warning.
3918 */
3919 if (!basic_rates && min_rate_index >= 0) {
3920 sdata_info(sdata,
3921 "No basic rates, using min rate instead\n");
3922 basic_rates = BIT(min_rate_index);
3923 }
3924
3925 new_sta->sta.supp_rates[cbss->channel->band] = rates;
3926 sdata->vif.bss_conf.basic_rates = basic_rates;
3927
3928 /* cf. IEEE 802.11 9.2.12 */
3929 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
3930 have_higher_than_11mbit)
3931 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
3932 else
3933 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
3934
3935 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
3936
3937 /* set timing information */
3938 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
3939 rcu_read_lock();
3940 ies = rcu_dereference(cbss->beacon_ies);
3941 if (ies) {
3942 const u8 *tim_ie;
3943
3944 sdata->vif.bss_conf.sync_tsf = ies->tsf;
3945 sdata->vif.bss_conf.sync_device_ts =
3946 bss->device_ts_beacon;
3947 tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
3948 ies->data, ies->len);
3949 if (tim_ie && tim_ie[1] >= 2)
3950 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
3951 else
3952 sdata->vif.bss_conf.sync_dtim_count = 0;
3953 } else if (!(local->hw.flags &
3954 IEEE80211_HW_TIMING_BEACON_ONLY)) {
3955 ies = rcu_dereference(cbss->proberesp_ies);
3956 /* must be non-NULL since beacon IEs were NULL */
3957 sdata->vif.bss_conf.sync_tsf = ies->tsf;
3958 sdata->vif.bss_conf.sync_device_ts =
3959 bss->device_ts_presp;
3960 sdata->vif.bss_conf.sync_dtim_count = 0;
3961 } else {
3962 sdata->vif.bss_conf.sync_tsf = 0;
3963 sdata->vif.bss_conf.sync_device_ts = 0;
3964 sdata->vif.bss_conf.sync_dtim_count = 0;
3965 }
3966 rcu_read_unlock();
3967
3968 /* tell driver about BSSID, basic rates and timing */
3969 ieee80211_bss_info_change_notify(sdata,
3970 BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
3971 BSS_CHANGED_BEACON_INT);
3972
3973 if (assoc)
3974 sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
3975
3976 err = sta_info_insert(new_sta);
3977 new_sta = NULL;
3978 if (err) {
3979 sdata_info(sdata,
3980 "failed to insert STA entry for the AP (error %d)\n",
3981 err);
3982 return err;
3983 }
3984 } else
3985 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
3986
3987 return 0;
3988 }
3989
3990 /* config hooks */
3991 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
3992 struct cfg80211_auth_request *req)
3993 {
3994 struct ieee80211_local *local = sdata->local;
3995 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3996 struct ieee80211_mgd_auth_data *auth_data;
3997 u16 auth_alg;
3998 int err;
3999
4000 /* prepare auth data structure */
4001
4002 switch (req->auth_type) {
4003 case NL80211_AUTHTYPE_OPEN_SYSTEM:
4004 auth_alg = WLAN_AUTH_OPEN;
4005 break;
4006 case NL80211_AUTHTYPE_SHARED_KEY:
4007 if (IS_ERR(local->wep_tx_tfm))
4008 return -EOPNOTSUPP;
4009 auth_alg = WLAN_AUTH_SHARED_KEY;
4010 break;
4011 case NL80211_AUTHTYPE_FT:
4012 auth_alg = WLAN_AUTH_FT;
4013 break;
4014 case NL80211_AUTHTYPE_NETWORK_EAP:
4015 auth_alg = WLAN_AUTH_LEAP;
4016 break;
4017 case NL80211_AUTHTYPE_SAE:
4018 auth_alg = WLAN_AUTH_SAE;
4019 break;
4020 default:
4021 return -EOPNOTSUPP;
4022 }
4023
4024 auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
4025 req->ie_len, GFP_KERNEL);
4026 if (!auth_data)
4027 return -ENOMEM;
4028
4029 auth_data->bss = req->bss;
4030
4031 if (req->sae_data_len >= 4) {
4032 __le16 *pos = (__le16 *) req->sae_data;
4033 auth_data->sae_trans = le16_to_cpu(pos[0]);
4034 auth_data->sae_status = le16_to_cpu(pos[1]);
4035 memcpy(auth_data->data, req->sae_data + 4,
4036 req->sae_data_len - 4);
4037 auth_data->data_len += req->sae_data_len - 4;
4038 }
4039
4040 if (req->ie && req->ie_len) {
4041 memcpy(&auth_data->data[auth_data->data_len],
4042 req->ie, req->ie_len);
4043 auth_data->data_len += req->ie_len;
4044 }
4045
4046 if (req->key && req->key_len) {
4047 auth_data->key_len = req->key_len;
4048 auth_data->key_idx = req->key_idx;
4049 memcpy(auth_data->key, req->key, req->key_len);
4050 }
4051
4052 auth_data->algorithm = auth_alg;
4053
4054 /* try to authenticate/probe */
4055
4056 if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4057 ifmgd->assoc_data) {
4058 err = -EBUSY;
4059 goto err_free;
4060 }
4061
4062 if (ifmgd->auth_data)
4063 ieee80211_destroy_auth_data(sdata, false);
4064
4065 /* prep auth_data so we don't go into idle on disassoc */
4066 ifmgd->auth_data = auth_data;
4067
4068 if (ifmgd->associated) {
4069 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4070
4071 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4072 WLAN_REASON_UNSPECIFIED,
4073 false, frame_buf);
4074
4075 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4076 sizeof(frame_buf));
4077 }
4078
4079 sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4080
4081 err = ieee80211_prep_connection(sdata, req->bss, false);
4082 if (err)
4083 goto err_clear;
4084
4085 err = ieee80211_probe_auth(sdata);
4086 if (err) {
4087 sta_info_destroy_addr(sdata, req->bss->bssid);
4088 goto err_clear;
4089 }
4090
4091 /* hold our own reference */
4092 cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4093 return 0;
4094
4095 err_clear:
4096 memset(ifmgd->bssid, 0, ETH_ALEN);
4097 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4098 ifmgd->auth_data = NULL;
4099 err_free:
4100 kfree(auth_data);
4101 return err;
4102 }
4103
4104 static bool ieee80211_usable_wmm_params(struct ieee80211_sub_if_data *sdata,
4105 const u8 *wmm_param, int len)
4106 {
4107 const u8 *pos;
4108 size_t left;
4109
4110 if (len < 8)
4111 return false;
4112
4113 if (wmm_param[5] != 1 /* version */)
4114 return false;
4115
4116 pos = wmm_param + 8;
4117 left = len - 8;
4118
4119 for (; left >= 4; left -= 4, pos += 4) {
4120 u8 aifsn = pos[0] & 0x0f;
4121 u8 ecwmin = pos[1] & 0x0f;
4122 u8 ecwmax = (pos[1] & 0xf0) >> 4;
4123 int aci = (pos[0] >> 5) & 0x03;
4124
4125 if (aifsn < 2) {
4126 sdata_info(sdata,
4127 "AP has invalid WMM params (AIFSN=%d for ACI %d), disabling WMM\n",
4128 aifsn, aci);
4129 return false;
4130 }
4131 if (ecwmin > ecwmax) {
4132 sdata_info(sdata,
4133 "AP has invalid WMM params (ECWmin/max=%d/%d for ACI %d), disabling WMM\n",
4134 ecwmin, ecwmax, aci);
4135 return false;
4136 }
4137 }
4138
4139 return true;
4140 }
4141
4142 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4143 struct cfg80211_assoc_request *req)
4144 {
4145 struct ieee80211_local *local = sdata->local;
4146 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4147 struct ieee80211_bss *bss = (void *)req->bss->priv;
4148 struct ieee80211_mgd_assoc_data *assoc_data;
4149 const struct cfg80211_bss_ies *beacon_ies;
4150 struct ieee80211_supported_band *sband;
4151 const u8 *ssidie, *ht_ie, *vht_ie;
4152 int i, err;
4153
4154 assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4155 if (!assoc_data)
4156 return -ENOMEM;
4157
4158 rcu_read_lock();
4159 ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4160 if (!ssidie) {
4161 rcu_read_unlock();
4162 kfree(assoc_data);
4163 return -EINVAL;
4164 }
4165 memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4166 assoc_data->ssid_len = ssidie[1];
4167 rcu_read_unlock();
4168
4169 if (ifmgd->associated) {
4170 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4171
4172 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4173 WLAN_REASON_UNSPECIFIED,
4174 false, frame_buf);
4175
4176 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4177 sizeof(frame_buf));
4178 }
4179
4180 if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4181 err = -EBUSY;
4182 goto err_free;
4183 }
4184
4185 if (ifmgd->assoc_data) {
4186 err = -EBUSY;
4187 goto err_free;
4188 }
4189
4190 if (ifmgd->auth_data) {
4191 bool match;
4192
4193 /* keep sta info, bssid if matching */
4194 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4195 ieee80211_destroy_auth_data(sdata, match);
4196 }
4197
4198 /* prepare assoc data */
4199
4200 ifmgd->beacon_crc_valid = false;
4201
4202 assoc_data->wmm = bss->wmm_used &&
4203 (local->hw.queues >= IEEE80211_NUM_ACS);
4204 if (assoc_data->wmm) {
4205 /* try to check validity of WMM params IE */
4206 const struct cfg80211_bss_ies *ies;
4207 const u8 *wp, *start, *end;
4208
4209 rcu_read_lock();
4210 ies = rcu_dereference(req->bss->ies);
4211 start = ies->data;
4212 end = start + ies->len;
4213
4214 while (true) {
4215 wp = cfg80211_find_vendor_ie(
4216 WLAN_OUI_MICROSOFT,
4217 WLAN_OUI_TYPE_MICROSOFT_WMM,
4218 start, end - start);
4219 if (!wp)
4220 break;
4221 start = wp + wp[1] + 2;
4222 /* if this IE is too short, try the next */
4223 if (wp[1] <= 4)
4224 continue;
4225 /* if this IE is WMM params, we found what we wanted */
4226 if (wp[6] == 1)
4227 break;
4228 }
4229
4230 if (!wp || !ieee80211_usable_wmm_params(sdata, wp + 2,
4231 wp[1] - 2)) {
4232 assoc_data->wmm = false;
4233 ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
4234 }
4235 rcu_read_unlock();
4236 }
4237
4238 /*
4239 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4240 * We still associate in non-HT mode (11a/b/g) if any one of these
4241 * ciphers is configured as pairwise.
4242 * We can set this to true for non-11n hardware, that'll be checked
4243 * separately along with the peer capabilities.
4244 */
4245 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4246 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4247 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4248 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4249 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4250 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4251 netdev_info(sdata->dev,
4252 "disabling HT/VHT due to WEP/TKIP use\n");
4253 }
4254 }
4255
4256 if (req->flags & ASSOC_REQ_DISABLE_HT) {
4257 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4258 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4259 }
4260
4261 if (req->flags & ASSOC_REQ_DISABLE_VHT)
4262 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4263
4264 /* Also disable HT if we don't support it or the AP doesn't use WMM */
4265 sband = local->hw.wiphy->bands[req->bss->channel->band];
4266 if (!sband->ht_cap.ht_supported ||
4267 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4268 ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4269 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4270 if (!bss->wmm_used &&
4271 !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4272 netdev_info(sdata->dev,
4273 "disabling HT as WMM/QoS is not supported by the AP\n");
4274 }
4275
4276 /* disable VHT if we don't support it or the AP doesn't use WMM */
4277 if (!sband->vht_cap.vht_supported ||
4278 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4279 ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4280 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4281 if (!bss->wmm_used &&
4282 !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4283 netdev_info(sdata->dev,
4284 "disabling VHT as WMM/QoS is not supported by the AP\n");
4285 }
4286
4287 memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4288 memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4289 sizeof(ifmgd->ht_capa_mask));
4290
4291 memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4292 memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4293 sizeof(ifmgd->vht_capa_mask));
4294
4295 if (req->ie && req->ie_len) {
4296 memcpy(assoc_data->ie, req->ie, req->ie_len);
4297 assoc_data->ie_len = req->ie_len;
4298 }
4299
4300 assoc_data->bss = req->bss;
4301
4302 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4303 if (ifmgd->powersave)
4304 sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4305 else
4306 sdata->smps_mode = IEEE80211_SMPS_OFF;
4307 } else
4308 sdata->smps_mode = ifmgd->req_smps;
4309
4310 assoc_data->capability = req->bss->capability;
4311 assoc_data->supp_rates = bss->supp_rates;
4312 assoc_data->supp_rates_len = bss->supp_rates_len;
4313
4314 rcu_read_lock();
4315 ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4316 if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4317 assoc_data->ap_ht_param =
4318 ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4319 else
4320 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4321 vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4322 if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4323 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4324 sizeof(struct ieee80211_vht_cap));
4325 else
4326 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4327 rcu_read_unlock();
4328
4329 if (bss->wmm_used && bss->uapsd_supported &&
4330 (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD) &&
4331 sdata->wmm_acm != 0xff) {
4332 assoc_data->uapsd = true;
4333 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4334 } else {
4335 assoc_data->uapsd = false;
4336 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4337 }
4338
4339 if (req->prev_bssid)
4340 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4341
4342 if (req->use_mfp) {
4343 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4344 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4345 } else {
4346 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4347 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4348 }
4349
4350 if (req->crypto.control_port)
4351 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4352 else
4353 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4354
4355 sdata->control_port_protocol = req->crypto.control_port_ethertype;
4356 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4357 sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4358 sdata->vif.type);
4359
4360 /* kick off associate process */
4361
4362 ifmgd->assoc_data = assoc_data;
4363 ifmgd->dtim_period = 0;
4364 ifmgd->have_beacon = false;
4365
4366 err = ieee80211_prep_connection(sdata, req->bss, true);
4367 if (err)
4368 goto err_clear;
4369
4370 rcu_read_lock();
4371 beacon_ies = rcu_dereference(req->bss->beacon_ies);
4372
4373 if (sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC &&
4374 !beacon_ies) {
4375 /*
4376 * Wait up to one beacon interval ...
4377 * should this be more if we miss one?
4378 */
4379 sdata_info(sdata, "waiting for beacon from %pM\n",
4380 ifmgd->bssid);
4381 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4382 assoc_data->timeout_started = true;
4383 assoc_data->need_beacon = true;
4384 } else if (beacon_ies) {
4385 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4386 beacon_ies->data,
4387 beacon_ies->len);
4388 u8 dtim_count = 0;
4389
4390 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4391 const struct ieee80211_tim_ie *tim;
4392 tim = (void *)(tim_ie + 2);
4393 ifmgd->dtim_period = tim->dtim_period;
4394 dtim_count = tim->dtim_count;
4395 }
4396 ifmgd->have_beacon = true;
4397 assoc_data->timeout = jiffies;
4398 assoc_data->timeout_started = true;
4399
4400 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
4401 sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4402 sdata->vif.bss_conf.sync_device_ts =
4403 bss->device_ts_beacon;
4404 sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4405 }
4406 } else {
4407 assoc_data->timeout = jiffies;
4408 assoc_data->timeout_started = true;
4409 }
4410 rcu_read_unlock();
4411
4412 run_again(sdata, assoc_data->timeout);
4413
4414 if (bss->corrupt_data) {
4415 char *corrupt_type = "data";
4416 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4417 if (bss->corrupt_data &
4418 IEEE80211_BSS_CORRUPT_PROBE_RESP)
4419 corrupt_type = "beacon and probe response";
4420 else
4421 corrupt_type = "beacon";
4422 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4423 corrupt_type = "probe response";
4424 sdata_info(sdata, "associating with AP with corrupt %s\n",
4425 corrupt_type);
4426 }
4427
4428 return 0;
4429 err_clear:
4430 memset(ifmgd->bssid, 0, ETH_ALEN);
4431 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4432 ifmgd->assoc_data = NULL;
4433 err_free:
4434 kfree(assoc_data);
4435 return err;
4436 }
4437
4438 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4439 struct cfg80211_deauth_request *req)
4440 {
4441 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4442 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4443 bool tx = !req->local_state_change;
4444
4445 if (ifmgd->auth_data &&
4446 ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
4447 sdata_info(sdata,
4448 "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
4449 req->bssid, req->reason_code,
4450 ieee80211_get_reason_code_string(req->reason_code));
4451
4452 drv_mgd_prepare_tx(sdata->local, sdata);
4453 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4454 IEEE80211_STYPE_DEAUTH,
4455 req->reason_code, tx,
4456 frame_buf);
4457 ieee80211_destroy_auth_data(sdata, false);
4458 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4459 IEEE80211_DEAUTH_FRAME_LEN);
4460
4461 return 0;
4462 }
4463
4464 if (ifmgd->associated &&
4465 ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4466 sdata_info(sdata,
4467 "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
4468 req->bssid, req->reason_code,
4469 ieee80211_get_reason_code_string(req->reason_code));
4470
4471 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4472 req->reason_code, tx, frame_buf);
4473 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4474 IEEE80211_DEAUTH_FRAME_LEN);
4475 return 0;
4476 }
4477
4478 return -ENOTCONN;
4479 }
4480
4481 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4482 struct cfg80211_disassoc_request *req)
4483 {
4484 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4485 u8 bssid[ETH_ALEN];
4486 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4487
4488 /*
4489 * cfg80211 should catch this ... but it's racy since
4490 * we can receive a disassoc frame, process it, hand it
4491 * to cfg80211 while that's in a locked section already
4492 * trying to tell us that the user wants to disconnect.
4493 */
4494 if (ifmgd->associated != req->bss)
4495 return -ENOLINK;
4496
4497 sdata_info(sdata,
4498 "disassociating from %pM by local choice (Reason: %u=%s)\n",
4499 req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
4500
4501 memcpy(bssid, req->bss->bssid, ETH_ALEN);
4502 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
4503 req->reason_code, !req->local_state_change,
4504 frame_buf);
4505
4506 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4507 IEEE80211_DEAUTH_FRAME_LEN);
4508
4509 return 0;
4510 }
4511
4512 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4513 {
4514 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4515
4516 /*
4517 * Make sure some work items will not run after this,
4518 * they will not do anything but might not have been
4519 * cancelled when disconnecting.
4520 */
4521 cancel_work_sync(&ifmgd->monitor_work);
4522 cancel_work_sync(&ifmgd->beacon_connection_loss_work);
4523 cancel_work_sync(&ifmgd->request_smps_work);
4524 cancel_work_sync(&ifmgd->csa_connection_drop_work);
4525 cancel_work_sync(&ifmgd->chswitch_work);
4526
4527 sdata_lock(sdata);
4528 if (ifmgd->assoc_data) {
4529 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
4530 ieee80211_destroy_assoc_data(sdata, false);
4531 cfg80211_assoc_timeout(sdata->dev, bss);
4532 }
4533 if (ifmgd->auth_data)
4534 ieee80211_destroy_auth_data(sdata, false);
4535 del_timer_sync(&ifmgd->timer);
4536 sdata_unlock(sdata);
4537 }
4538
4539 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
4540 enum nl80211_cqm_rssi_threshold_event rssi_event,
4541 gfp_t gfp)
4542 {
4543 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4544
4545 trace_api_cqm_rssi_notify(sdata, rssi_event);
4546
4547 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
4548 }
4549 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
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