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Merge tag 'xfs-for-linus-4.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git...
[mirror_ubuntu-zesty-kernel.git] / net / mac80211 / mlme.c
1 /*
2 * BSS client mode implementation
3 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4 * Copyright 2004, Instant802 Networks, Inc.
5 * Copyright 2005, Devicescape Software, Inc.
6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8 * Copyright 2013-2014 Intel Mobile Communications GmbH
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 */
14
15 #include <linux/delay.h>
16 #include <linux/if_ether.h>
17 #include <linux/skbuff.h>
18 #include <linux/if_arp.h>
19 #include <linux/etherdevice.h>
20 #include <linux/moduleparam.h>
21 #include <linux/rtnetlink.h>
22 #include <linux/pm_qos.h>
23 #include <linux/crc32.h>
24 #include <linux/slab.h>
25 #include <linux/export.h>
26 #include <net/mac80211.h>
27 #include <asm/unaligned.h>
28
29 #include "ieee80211_i.h"
30 #include "driver-ops.h"
31 #include "rate.h"
32 #include "led.h"
33
34 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
35 #define IEEE80211_AUTH_TIMEOUT_LONG (HZ / 2)
36 #define IEEE80211_AUTH_TIMEOUT_SHORT (HZ / 10)
37 #define IEEE80211_AUTH_MAX_TRIES 3
38 #define IEEE80211_AUTH_WAIT_ASSOC (HZ * 5)
39 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
40 #define IEEE80211_ASSOC_TIMEOUT_LONG (HZ / 2)
41 #define IEEE80211_ASSOC_TIMEOUT_SHORT (HZ / 10)
42 #define IEEE80211_ASSOC_MAX_TRIES 3
43
44 static int max_nullfunc_tries = 2;
45 module_param(max_nullfunc_tries, int, 0644);
46 MODULE_PARM_DESC(max_nullfunc_tries,
47 "Maximum nullfunc tx tries before disconnecting (reason 4).");
48
49 static int max_probe_tries = 5;
50 module_param(max_probe_tries, int, 0644);
51 MODULE_PARM_DESC(max_probe_tries,
52 "Maximum probe tries before disconnecting (reason 4).");
53
54 /*
55 * Beacon loss timeout is calculated as N frames times the
56 * advertised beacon interval. This may need to be somewhat
57 * higher than what hardware might detect to account for
58 * delays in the host processing frames. But since we also
59 * probe on beacon miss before declaring the connection lost
60 * default to what we want.
61 */
62 static int beacon_loss_count = 7;
63 module_param(beacon_loss_count, int, 0644);
64 MODULE_PARM_DESC(beacon_loss_count,
65 "Number of beacon intervals before we decide beacon was lost.");
66
67 /*
68 * Time the connection can be idle before we probe
69 * it to see if we can still talk to the AP.
70 */
71 #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ)
72 /*
73 * Time we wait for a probe response after sending
74 * a probe request because of beacon loss or for
75 * checking the connection still works.
76 */
77 static int probe_wait_ms = 500;
78 module_param(probe_wait_ms, int, 0644);
79 MODULE_PARM_DESC(probe_wait_ms,
80 "Maximum time(ms) to wait for probe response"
81 " before disconnecting (reason 4).");
82
83 /*
84 * Weight given to the latest Beacon frame when calculating average signal
85 * strength for Beacon frames received in the current BSS. This must be
86 * between 1 and 15.
87 */
88 #define IEEE80211_SIGNAL_AVE_WEIGHT 3
89
90 /*
91 * How many Beacon frames need to have been used in average signal strength
92 * before starting to indicate signal change events.
93 */
94 #define IEEE80211_SIGNAL_AVE_MIN_COUNT 4
95
96 /*
97 * We can have multiple work items (and connection probing)
98 * scheduling this timer, but we need to take care to only
99 * reschedule it when it should fire _earlier_ than it was
100 * asked for before, or if it's not pending right now. This
101 * function ensures that. Note that it then is required to
102 * run this function for all timeouts after the first one
103 * has happened -- the work that runs from this timer will
104 * do that.
105 */
106 static void run_again(struct ieee80211_sub_if_data *sdata,
107 unsigned long timeout)
108 {
109 sdata_assert_lock(sdata);
110
111 if (!timer_pending(&sdata->u.mgd.timer) ||
112 time_before(timeout, sdata->u.mgd.timer.expires))
113 mod_timer(&sdata->u.mgd.timer, timeout);
114 }
115
116 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
117 {
118 if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
119 return;
120
121 if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
122 return;
123
124 mod_timer(&sdata->u.mgd.bcn_mon_timer,
125 round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
126 }
127
128 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
129 {
130 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
131
132 if (unlikely(!sdata->u.mgd.associated))
133 return;
134
135 ifmgd->probe_send_count = 0;
136
137 if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
138 return;
139
140 mod_timer(&sdata->u.mgd.conn_mon_timer,
141 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
142 }
143
144 static int ecw2cw(int ecw)
145 {
146 return (1 << ecw) - 1;
147 }
148
149 static u32
150 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
151 struct ieee80211_supported_band *sband,
152 struct ieee80211_channel *channel,
153 const struct ieee80211_ht_cap *ht_cap,
154 const struct ieee80211_ht_operation *ht_oper,
155 const struct ieee80211_vht_operation *vht_oper,
156 struct cfg80211_chan_def *chandef, bool tracking)
157 {
158 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
159 struct cfg80211_chan_def vht_chandef;
160 struct ieee80211_sta_ht_cap sta_ht_cap;
161 u32 ht_cfreq, ret;
162
163 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
164 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
165
166 chandef->chan = channel;
167 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
168 chandef->center_freq1 = channel->center_freq;
169 chandef->center_freq2 = 0;
170
171 if (!ht_cap || !ht_oper || !sta_ht_cap.ht_supported) {
172 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
173 goto out;
174 }
175
176 chandef->width = NL80211_CHAN_WIDTH_20;
177
178 if (!(ht_cap->cap_info &
179 cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40))) {
180 ret = IEEE80211_STA_DISABLE_40MHZ;
181 vht_chandef = *chandef;
182 goto out;
183 }
184
185 ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
186 channel->band);
187 /* check that channel matches the right operating channel */
188 if (!tracking && channel->center_freq != ht_cfreq) {
189 /*
190 * It's possible that some APs are confused here;
191 * Netgear WNDR3700 sometimes reports 4 higher than
192 * the actual channel in association responses, but
193 * since we look at probe response/beacon data here
194 * it should be OK.
195 */
196 sdata_info(sdata,
197 "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
198 channel->center_freq, ht_cfreq,
199 ht_oper->primary_chan, channel->band);
200 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
201 goto out;
202 }
203
204 /* check 40 MHz support, if we have it */
205 if (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
206 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
207 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
208 chandef->width = NL80211_CHAN_WIDTH_40;
209 chandef->center_freq1 += 10;
210 break;
211 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
212 chandef->width = NL80211_CHAN_WIDTH_40;
213 chandef->center_freq1 -= 10;
214 break;
215 }
216 } else {
217 /* 40 MHz (and 80 MHz) must be supported for VHT */
218 ret = IEEE80211_STA_DISABLE_VHT;
219 /* also mark 40 MHz disabled */
220 ret |= IEEE80211_STA_DISABLE_40MHZ;
221 goto out;
222 }
223
224 if (!vht_oper || !sband->vht_cap.vht_supported) {
225 ret = IEEE80211_STA_DISABLE_VHT;
226 goto out;
227 }
228
229 vht_chandef.chan = channel;
230 vht_chandef.center_freq1 =
231 ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx,
232 channel->band);
233 vht_chandef.center_freq2 = 0;
234
235 switch (vht_oper->chan_width) {
236 case IEEE80211_VHT_CHANWIDTH_USE_HT:
237 vht_chandef.width = chandef->width;
238 vht_chandef.center_freq1 = chandef->center_freq1;
239 break;
240 case IEEE80211_VHT_CHANWIDTH_80MHZ:
241 vht_chandef.width = NL80211_CHAN_WIDTH_80;
242 break;
243 case IEEE80211_VHT_CHANWIDTH_160MHZ:
244 vht_chandef.width = NL80211_CHAN_WIDTH_160;
245 break;
246 case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
247 vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
248 vht_chandef.center_freq2 =
249 ieee80211_channel_to_frequency(
250 vht_oper->center_freq_seg2_idx,
251 channel->band);
252 break;
253 default:
254 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
255 sdata_info(sdata,
256 "AP VHT operation IE has invalid channel width (%d), disable VHT\n",
257 vht_oper->chan_width);
258 ret = IEEE80211_STA_DISABLE_VHT;
259 goto out;
260 }
261
262 if (!cfg80211_chandef_valid(&vht_chandef)) {
263 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
264 sdata_info(sdata,
265 "AP VHT information is invalid, disable VHT\n");
266 ret = IEEE80211_STA_DISABLE_VHT;
267 goto out;
268 }
269
270 if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
271 ret = 0;
272 goto out;
273 }
274
275 if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
276 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
277 sdata_info(sdata,
278 "AP VHT information doesn't match HT, disable VHT\n");
279 ret = IEEE80211_STA_DISABLE_VHT;
280 goto out;
281 }
282
283 *chandef = vht_chandef;
284
285 ret = 0;
286
287 out:
288 /*
289 * When tracking the current AP, don't do any further checks if the
290 * new chandef is identical to the one we're currently using for the
291 * connection. This keeps us from playing ping-pong with regulatory,
292 * without it the following can happen (for example):
293 * - connect to an AP with 80 MHz, world regdom allows 80 MHz
294 * - AP advertises regdom US
295 * - CRDA loads regdom US with 80 MHz prohibited (old database)
296 * - the code below detects an unsupported channel, downgrades, and
297 * we disconnect from the AP in the caller
298 * - disconnect causes CRDA to reload world regdomain and the game
299 * starts anew.
300 * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
301 *
302 * It seems possible that there are still scenarios with CSA or real
303 * bandwidth changes where a this could happen, but those cases are
304 * less common and wouldn't completely prevent using the AP.
305 */
306 if (tracking &&
307 cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
308 return ret;
309
310 /* don't print the message below for VHT mismatch if VHT is disabled */
311 if (ret & IEEE80211_STA_DISABLE_VHT)
312 vht_chandef = *chandef;
313
314 /*
315 * Ignore the DISABLED flag when we're already connected and only
316 * tracking the APs beacon for bandwidth changes - otherwise we
317 * might get disconnected here if we connect to an AP, update our
318 * regulatory information based on the AP's country IE and the
319 * information we have is wrong/outdated and disables the channel
320 * that we're actually using for the connection to the AP.
321 */
322 while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
323 tracking ? 0 :
324 IEEE80211_CHAN_DISABLED)) {
325 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
326 ret = IEEE80211_STA_DISABLE_HT |
327 IEEE80211_STA_DISABLE_VHT;
328 break;
329 }
330
331 ret |= ieee80211_chandef_downgrade(chandef);
332 }
333
334 if (chandef->width != vht_chandef.width && !tracking)
335 sdata_info(sdata,
336 "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
337
338 WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
339 return ret;
340 }
341
342 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
343 struct sta_info *sta,
344 const struct ieee80211_ht_cap *ht_cap,
345 const struct ieee80211_ht_operation *ht_oper,
346 const struct ieee80211_vht_operation *vht_oper,
347 const u8 *bssid, u32 *changed)
348 {
349 struct ieee80211_local *local = sdata->local;
350 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
351 struct ieee80211_supported_band *sband;
352 struct ieee80211_channel *chan;
353 struct cfg80211_chan_def chandef;
354 u16 ht_opmode;
355 u32 flags;
356 enum ieee80211_sta_rx_bandwidth new_sta_bw;
357 int ret;
358
359 /* if HT was/is disabled, don't track any bandwidth changes */
360 if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
361 return 0;
362
363 /* don't check VHT if we associated as non-VHT station */
364 if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
365 vht_oper = NULL;
366
367 if (WARN_ON_ONCE(!sta))
368 return -EINVAL;
369
370 /*
371 * if bss configuration changed store the new one -
372 * this may be applicable even if channel is identical
373 */
374 ht_opmode = le16_to_cpu(ht_oper->operation_mode);
375 if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
376 *changed |= BSS_CHANGED_HT;
377 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
378 }
379
380 chan = sdata->vif.bss_conf.chandef.chan;
381 sband = local->hw.wiphy->bands[chan->band];
382
383 /* calculate new channel (type) based on HT/VHT operation IEs */
384 flags = ieee80211_determine_chantype(sdata, sband, chan,
385 ht_cap, ht_oper, vht_oper,
386 &chandef, true);
387
388 /*
389 * Downgrade the new channel if we associated with restricted
390 * capabilities. For example, if we associated as a 20 MHz STA
391 * to a 40 MHz AP (due to regulatory, capabilities or config
392 * reasons) then switching to a 40 MHz channel now won't do us
393 * any good -- we couldn't use it with the AP.
394 */
395 if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
396 chandef.width == NL80211_CHAN_WIDTH_80P80)
397 flags |= ieee80211_chandef_downgrade(&chandef);
398 if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
399 chandef.width == NL80211_CHAN_WIDTH_160)
400 flags |= ieee80211_chandef_downgrade(&chandef);
401 if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
402 chandef.width > NL80211_CHAN_WIDTH_20)
403 flags |= ieee80211_chandef_downgrade(&chandef);
404
405 if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
406 return 0;
407
408 sdata_info(sdata,
409 "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
410 ifmgd->bssid, chandef.chan->center_freq, chandef.width,
411 chandef.center_freq1, chandef.center_freq2);
412
413 if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
414 IEEE80211_STA_DISABLE_VHT |
415 IEEE80211_STA_DISABLE_40MHZ |
416 IEEE80211_STA_DISABLE_80P80MHZ |
417 IEEE80211_STA_DISABLE_160MHZ)) ||
418 !cfg80211_chandef_valid(&chandef)) {
419 sdata_info(sdata,
420 "AP %pM changed bandwidth in a way we can't support - disconnect\n",
421 ifmgd->bssid);
422 return -EINVAL;
423 }
424
425 switch (chandef.width) {
426 case NL80211_CHAN_WIDTH_20_NOHT:
427 case NL80211_CHAN_WIDTH_20:
428 new_sta_bw = IEEE80211_STA_RX_BW_20;
429 break;
430 case NL80211_CHAN_WIDTH_40:
431 new_sta_bw = IEEE80211_STA_RX_BW_40;
432 break;
433 case NL80211_CHAN_WIDTH_80:
434 new_sta_bw = IEEE80211_STA_RX_BW_80;
435 break;
436 case NL80211_CHAN_WIDTH_80P80:
437 case NL80211_CHAN_WIDTH_160:
438 new_sta_bw = IEEE80211_STA_RX_BW_160;
439 break;
440 default:
441 return -EINVAL;
442 }
443
444 if (new_sta_bw > sta->cur_max_bandwidth)
445 new_sta_bw = sta->cur_max_bandwidth;
446
447 if (new_sta_bw < sta->sta.bandwidth) {
448 sta->sta.bandwidth = new_sta_bw;
449 rate_control_rate_update(local, sband, sta,
450 IEEE80211_RC_BW_CHANGED);
451 }
452
453 ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
454 if (ret) {
455 sdata_info(sdata,
456 "AP %pM changed bandwidth to incompatible one - disconnect\n",
457 ifmgd->bssid);
458 return ret;
459 }
460
461 if (new_sta_bw > sta->sta.bandwidth) {
462 sta->sta.bandwidth = new_sta_bw;
463 rate_control_rate_update(local, sband, sta,
464 IEEE80211_RC_BW_CHANGED);
465 }
466
467 return 0;
468 }
469
470 /* frame sending functions */
471
472 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
473 struct sk_buff *skb, u8 ap_ht_param,
474 struct ieee80211_supported_band *sband,
475 struct ieee80211_channel *channel,
476 enum ieee80211_smps_mode smps)
477 {
478 u8 *pos;
479 u32 flags = channel->flags;
480 u16 cap;
481 struct ieee80211_sta_ht_cap ht_cap;
482
483 BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
484
485 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
486 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
487
488 /* determine capability flags */
489 cap = ht_cap.cap;
490
491 switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
492 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
493 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
494 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
495 cap &= ~IEEE80211_HT_CAP_SGI_40;
496 }
497 break;
498 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
499 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
500 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
501 cap &= ~IEEE80211_HT_CAP_SGI_40;
502 }
503 break;
504 }
505
506 /*
507 * If 40 MHz was disabled associate as though we weren't
508 * capable of 40 MHz -- some broken APs will never fall
509 * back to trying to transmit in 20 MHz.
510 */
511 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
512 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
513 cap &= ~IEEE80211_HT_CAP_SGI_40;
514 }
515
516 /* set SM PS mode properly */
517 cap &= ~IEEE80211_HT_CAP_SM_PS;
518 switch (smps) {
519 case IEEE80211_SMPS_AUTOMATIC:
520 case IEEE80211_SMPS_NUM_MODES:
521 WARN_ON(1);
522 case IEEE80211_SMPS_OFF:
523 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
524 IEEE80211_HT_CAP_SM_PS_SHIFT;
525 break;
526 case IEEE80211_SMPS_STATIC:
527 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
528 IEEE80211_HT_CAP_SM_PS_SHIFT;
529 break;
530 case IEEE80211_SMPS_DYNAMIC:
531 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
532 IEEE80211_HT_CAP_SM_PS_SHIFT;
533 break;
534 }
535
536 /* reserve and fill IE */
537 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
538 ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
539 }
540
541 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
542 struct sk_buff *skb,
543 struct ieee80211_supported_band *sband,
544 struct ieee80211_vht_cap *ap_vht_cap)
545 {
546 u8 *pos;
547 u32 cap;
548 struct ieee80211_sta_vht_cap vht_cap;
549 u32 mask, ap_bf_sts, our_bf_sts;
550
551 BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
552
553 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
554 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
555
556 /* determine capability flags */
557 cap = vht_cap.cap;
558
559 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
560 u32 bw = cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
561
562 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
563 if (bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ ||
564 bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
565 cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
566 }
567
568 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
569 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
570 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
571 }
572
573 /*
574 * Some APs apparently get confused if our capabilities are better
575 * than theirs, so restrict what we advertise in the assoc request.
576 */
577 if (!(ap_vht_cap->vht_cap_info &
578 cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
579 cap &= ~IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE;
580
581 mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
582
583 ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask;
584 our_bf_sts = cap & mask;
585
586 if (ap_bf_sts < our_bf_sts) {
587 cap &= ~mask;
588 cap |= ap_bf_sts;
589 }
590
591 /* reserve and fill IE */
592 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
593 ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
594 }
595
596 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
597 {
598 struct ieee80211_local *local = sdata->local;
599 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
600 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
601 struct sk_buff *skb;
602 struct ieee80211_mgmt *mgmt;
603 u8 *pos, qos_info;
604 size_t offset = 0, noffset;
605 int i, count, rates_len, supp_rates_len, shift;
606 u16 capab;
607 struct ieee80211_supported_band *sband;
608 struct ieee80211_chanctx_conf *chanctx_conf;
609 struct ieee80211_channel *chan;
610 u32 rate_flags, rates = 0;
611
612 sdata_assert_lock(sdata);
613
614 rcu_read_lock();
615 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
616 if (WARN_ON(!chanctx_conf)) {
617 rcu_read_unlock();
618 return;
619 }
620 chan = chanctx_conf->def.chan;
621 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
622 rcu_read_unlock();
623 sband = local->hw.wiphy->bands[chan->band];
624 shift = ieee80211_vif_get_shift(&sdata->vif);
625
626 if (assoc_data->supp_rates_len) {
627 /*
628 * Get all rates supported by the device and the AP as
629 * some APs don't like getting a superset of their rates
630 * in the association request (e.g. D-Link DAP 1353 in
631 * b-only mode)...
632 */
633 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
634 assoc_data->supp_rates,
635 assoc_data->supp_rates_len,
636 &rates);
637 } else {
638 /*
639 * In case AP not provide any supported rates information
640 * before association, we send information element(s) with
641 * all rates that we support.
642 */
643 rates_len = 0;
644 for (i = 0; i < sband->n_bitrates; i++) {
645 if ((rate_flags & sband->bitrates[i].flags)
646 != rate_flags)
647 continue;
648 rates |= BIT(i);
649 rates_len++;
650 }
651 }
652
653 skb = alloc_skb(local->hw.extra_tx_headroom +
654 sizeof(*mgmt) + /* bit too much but doesn't matter */
655 2 + assoc_data->ssid_len + /* SSID */
656 4 + rates_len + /* (extended) rates */
657 4 + /* power capability */
658 2 + 2 * sband->n_channels + /* supported channels */
659 2 + sizeof(struct ieee80211_ht_cap) + /* HT */
660 2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
661 assoc_data->ie_len + /* extra IEs */
662 9, /* WMM */
663 GFP_KERNEL);
664 if (!skb)
665 return;
666
667 skb_reserve(skb, local->hw.extra_tx_headroom);
668
669 capab = WLAN_CAPABILITY_ESS;
670
671 if (sband->band == IEEE80211_BAND_2GHZ) {
672 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
673 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
674 }
675
676 if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
677 capab |= WLAN_CAPABILITY_PRIVACY;
678
679 if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
680 ieee80211_hw_check(&local->hw, SPECTRUM_MGMT))
681 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
682
683 if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM)
684 capab |= WLAN_CAPABILITY_RADIO_MEASURE;
685
686 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
687 memset(mgmt, 0, 24);
688 memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
689 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
690 memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
691
692 if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
693 skb_put(skb, 10);
694 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
695 IEEE80211_STYPE_REASSOC_REQ);
696 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
697 mgmt->u.reassoc_req.listen_interval =
698 cpu_to_le16(local->hw.conf.listen_interval);
699 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
700 ETH_ALEN);
701 } else {
702 skb_put(skb, 4);
703 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
704 IEEE80211_STYPE_ASSOC_REQ);
705 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
706 mgmt->u.assoc_req.listen_interval =
707 cpu_to_le16(local->hw.conf.listen_interval);
708 }
709
710 /* SSID */
711 pos = skb_put(skb, 2 + assoc_data->ssid_len);
712 *pos++ = WLAN_EID_SSID;
713 *pos++ = assoc_data->ssid_len;
714 memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
715
716 /* add all rates which were marked to be used above */
717 supp_rates_len = rates_len;
718 if (supp_rates_len > 8)
719 supp_rates_len = 8;
720
721 pos = skb_put(skb, supp_rates_len + 2);
722 *pos++ = WLAN_EID_SUPP_RATES;
723 *pos++ = supp_rates_len;
724
725 count = 0;
726 for (i = 0; i < sband->n_bitrates; i++) {
727 if (BIT(i) & rates) {
728 int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
729 5 * (1 << shift));
730 *pos++ = (u8) rate;
731 if (++count == 8)
732 break;
733 }
734 }
735
736 if (rates_len > count) {
737 pos = skb_put(skb, rates_len - count + 2);
738 *pos++ = WLAN_EID_EXT_SUPP_RATES;
739 *pos++ = rates_len - count;
740
741 for (i++; i < sband->n_bitrates; i++) {
742 if (BIT(i) & rates) {
743 int rate;
744 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
745 5 * (1 << shift));
746 *pos++ = (u8) rate;
747 }
748 }
749 }
750
751 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT ||
752 capab & WLAN_CAPABILITY_RADIO_MEASURE) {
753 pos = skb_put(skb, 4);
754 *pos++ = WLAN_EID_PWR_CAPABILITY;
755 *pos++ = 2;
756 *pos++ = 0; /* min tx power */
757 /* max tx power */
758 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
759 }
760
761 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
762 /* TODO: get this in reg domain format */
763 pos = skb_put(skb, 2 * sband->n_channels + 2);
764 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
765 *pos++ = 2 * sband->n_channels;
766 for (i = 0; i < sband->n_channels; i++) {
767 *pos++ = ieee80211_frequency_to_channel(
768 sband->channels[i].center_freq);
769 *pos++ = 1; /* one channel in the subband*/
770 }
771 }
772
773 /* if present, add any custom IEs that go before HT */
774 if (assoc_data->ie_len) {
775 static const u8 before_ht[] = {
776 WLAN_EID_SSID,
777 WLAN_EID_SUPP_RATES,
778 WLAN_EID_EXT_SUPP_RATES,
779 WLAN_EID_PWR_CAPABILITY,
780 WLAN_EID_SUPPORTED_CHANNELS,
781 WLAN_EID_RSN,
782 WLAN_EID_QOS_CAPA,
783 WLAN_EID_RRM_ENABLED_CAPABILITIES,
784 WLAN_EID_MOBILITY_DOMAIN,
785 WLAN_EID_FAST_BSS_TRANSITION, /* reassoc only */
786 WLAN_EID_RIC_DATA, /* reassoc only */
787 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
788 };
789 static const u8 after_ric[] = {
790 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
791 WLAN_EID_HT_CAPABILITY,
792 WLAN_EID_BSS_COEX_2040,
793 WLAN_EID_EXT_CAPABILITY,
794 WLAN_EID_QOS_TRAFFIC_CAPA,
795 WLAN_EID_TIM_BCAST_REQ,
796 WLAN_EID_INTERWORKING,
797 /* 60GHz doesn't happen right now */
798 WLAN_EID_VHT_CAPABILITY,
799 WLAN_EID_OPMODE_NOTIF,
800 };
801
802 noffset = ieee80211_ie_split_ric(assoc_data->ie,
803 assoc_data->ie_len,
804 before_ht,
805 ARRAY_SIZE(before_ht),
806 after_ric,
807 ARRAY_SIZE(after_ric),
808 offset);
809 pos = skb_put(skb, noffset - offset);
810 memcpy(pos, assoc_data->ie + offset, noffset - offset);
811 offset = noffset;
812 }
813
814 if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
815 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
816 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
817
818 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
819 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
820 sband, chan, sdata->smps_mode);
821
822 /* if present, add any custom IEs that go before VHT */
823 if (assoc_data->ie_len) {
824 static const u8 before_vht[] = {
825 WLAN_EID_SSID,
826 WLAN_EID_SUPP_RATES,
827 WLAN_EID_EXT_SUPP_RATES,
828 WLAN_EID_PWR_CAPABILITY,
829 WLAN_EID_SUPPORTED_CHANNELS,
830 WLAN_EID_RSN,
831 WLAN_EID_QOS_CAPA,
832 WLAN_EID_RRM_ENABLED_CAPABILITIES,
833 WLAN_EID_MOBILITY_DOMAIN,
834 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
835 WLAN_EID_HT_CAPABILITY,
836 WLAN_EID_BSS_COEX_2040,
837 WLAN_EID_EXT_CAPABILITY,
838 WLAN_EID_QOS_TRAFFIC_CAPA,
839 WLAN_EID_TIM_BCAST_REQ,
840 WLAN_EID_INTERWORKING,
841 };
842
843 /* RIC already taken above, so no need to handle here anymore */
844 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
845 before_vht, ARRAY_SIZE(before_vht),
846 offset);
847 pos = skb_put(skb, noffset - offset);
848 memcpy(pos, assoc_data->ie + offset, noffset - offset);
849 offset = noffset;
850 }
851
852 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
853 ieee80211_add_vht_ie(sdata, skb, sband,
854 &assoc_data->ap_vht_cap);
855
856 /* if present, add any custom non-vendor IEs that go after HT */
857 if (assoc_data->ie_len) {
858 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
859 assoc_data->ie_len,
860 offset);
861 pos = skb_put(skb, noffset - offset);
862 memcpy(pos, assoc_data->ie + offset, noffset - offset);
863 offset = noffset;
864 }
865
866 if (assoc_data->wmm) {
867 if (assoc_data->uapsd) {
868 qos_info = ifmgd->uapsd_queues;
869 qos_info |= (ifmgd->uapsd_max_sp_len <<
870 IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
871 } else {
872 qos_info = 0;
873 }
874
875 pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
876 }
877
878 /* add any remaining custom (i.e. vendor specific here) IEs */
879 if (assoc_data->ie_len) {
880 noffset = assoc_data->ie_len;
881 pos = skb_put(skb, noffset - offset);
882 memcpy(pos, assoc_data->ie + offset, noffset - offset);
883 }
884
885 drv_mgd_prepare_tx(local, sdata);
886
887 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
888 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
889 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
890 IEEE80211_TX_INTFL_MLME_CONN_TX;
891 ieee80211_tx_skb(sdata, skb);
892 }
893
894 void ieee80211_send_pspoll(struct ieee80211_local *local,
895 struct ieee80211_sub_if_data *sdata)
896 {
897 struct ieee80211_pspoll *pspoll;
898 struct sk_buff *skb;
899
900 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
901 if (!skb)
902 return;
903
904 pspoll = (struct ieee80211_pspoll *) skb->data;
905 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
906
907 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
908 ieee80211_tx_skb(sdata, skb);
909 }
910
911 void ieee80211_send_nullfunc(struct ieee80211_local *local,
912 struct ieee80211_sub_if_data *sdata,
913 int powersave)
914 {
915 struct sk_buff *skb;
916 struct ieee80211_hdr_3addr *nullfunc;
917 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
918
919 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
920 if (!skb)
921 return;
922
923 nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
924 if (powersave)
925 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
926
927 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
928 IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
929
930 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
931 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
932
933 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
934 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
935
936 ieee80211_tx_skb(sdata, skb);
937 }
938
939 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
940 struct ieee80211_sub_if_data *sdata)
941 {
942 struct sk_buff *skb;
943 struct ieee80211_hdr *nullfunc;
944 __le16 fc;
945
946 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
947 return;
948
949 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
950 if (!skb)
951 return;
952
953 skb_reserve(skb, local->hw.extra_tx_headroom);
954
955 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
956 memset(nullfunc, 0, 30);
957 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
958 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
959 nullfunc->frame_control = fc;
960 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
961 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
962 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
963 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
964
965 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
966 ieee80211_tx_skb(sdata, skb);
967 }
968
969 /* spectrum management related things */
970 static void ieee80211_chswitch_work(struct work_struct *work)
971 {
972 struct ieee80211_sub_if_data *sdata =
973 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
974 struct ieee80211_local *local = sdata->local;
975 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
976 int ret;
977
978 if (!ieee80211_sdata_running(sdata))
979 return;
980
981 sdata_lock(sdata);
982 mutex_lock(&local->mtx);
983 mutex_lock(&local->chanctx_mtx);
984
985 if (!ifmgd->associated)
986 goto out;
987
988 if (!sdata->vif.csa_active)
989 goto out;
990
991 /*
992 * using reservation isn't immediate as it may be deferred until later
993 * with multi-vif. once reservation is complete it will re-schedule the
994 * work with no reserved_chanctx so verify chandef to check if it
995 * completed successfully
996 */
997
998 if (sdata->reserved_chanctx) {
999 /*
1000 * with multi-vif csa driver may call ieee80211_csa_finish()
1001 * many times while waiting for other interfaces to use their
1002 * reservations
1003 */
1004 if (sdata->reserved_ready)
1005 goto out;
1006
1007 ret = ieee80211_vif_use_reserved_context(sdata);
1008 if (ret) {
1009 sdata_info(sdata,
1010 "failed to use reserved channel context, disconnecting (err=%d)\n",
1011 ret);
1012 ieee80211_queue_work(&sdata->local->hw,
1013 &ifmgd->csa_connection_drop_work);
1014 goto out;
1015 }
1016
1017 goto out;
1018 }
1019
1020 if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
1021 &sdata->csa_chandef)) {
1022 sdata_info(sdata,
1023 "failed to finalize channel switch, disconnecting\n");
1024 ieee80211_queue_work(&sdata->local->hw,
1025 &ifmgd->csa_connection_drop_work);
1026 goto out;
1027 }
1028
1029 /* XXX: shouldn't really modify cfg80211-owned data! */
1030 ifmgd->associated->channel = sdata->csa_chandef.chan;
1031
1032 ifmgd->csa_waiting_bcn = true;
1033
1034 ieee80211_sta_reset_beacon_monitor(sdata);
1035 ieee80211_sta_reset_conn_monitor(sdata);
1036
1037 out:
1038 mutex_unlock(&local->chanctx_mtx);
1039 mutex_unlock(&local->mtx);
1040 sdata_unlock(sdata);
1041 }
1042
1043 static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata)
1044 {
1045 struct ieee80211_local *local = sdata->local;
1046 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1047 int ret;
1048
1049 sdata_assert_lock(sdata);
1050
1051 WARN_ON(!sdata->vif.csa_active);
1052
1053 if (sdata->csa_block_tx) {
1054 ieee80211_wake_vif_queues(local, sdata,
1055 IEEE80211_QUEUE_STOP_REASON_CSA);
1056 sdata->csa_block_tx = false;
1057 }
1058
1059 sdata->vif.csa_active = false;
1060 ifmgd->csa_waiting_bcn = false;
1061
1062 ret = drv_post_channel_switch(sdata);
1063 if (ret) {
1064 sdata_info(sdata,
1065 "driver post channel switch failed, disconnecting\n");
1066 ieee80211_queue_work(&local->hw,
1067 &ifmgd->csa_connection_drop_work);
1068 return;
1069 }
1070
1071 cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef);
1072 }
1073
1074 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
1075 {
1076 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1077 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1078
1079 trace_api_chswitch_done(sdata, success);
1080 if (!success) {
1081 sdata_info(sdata,
1082 "driver channel switch failed, disconnecting\n");
1083 ieee80211_queue_work(&sdata->local->hw,
1084 &ifmgd->csa_connection_drop_work);
1085 } else {
1086 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1087 }
1088 }
1089 EXPORT_SYMBOL(ieee80211_chswitch_done);
1090
1091 static void ieee80211_chswitch_timer(unsigned long data)
1092 {
1093 struct ieee80211_sub_if_data *sdata =
1094 (struct ieee80211_sub_if_data *) data;
1095
1096 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1097 }
1098
1099 static void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata)
1100 {
1101 struct sta_info *sta;
1102 u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED;
1103
1104 rcu_read_lock();
1105 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1106 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1107 !test_sta_flag(sta, WLAN_STA_AUTHORIZED))
1108 continue;
1109
1110 ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr,
1111 NL80211_TDLS_TEARDOWN, reason,
1112 GFP_ATOMIC);
1113 }
1114 rcu_read_unlock();
1115 }
1116
1117 static void
1118 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1119 u64 timestamp, u32 device_timestamp,
1120 struct ieee802_11_elems *elems,
1121 bool beacon)
1122 {
1123 struct ieee80211_local *local = sdata->local;
1124 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1125 struct cfg80211_bss *cbss = ifmgd->associated;
1126 struct ieee80211_chanctx_conf *conf;
1127 struct ieee80211_chanctx *chanctx;
1128 enum ieee80211_band current_band;
1129 struct ieee80211_csa_ie csa_ie;
1130 struct ieee80211_channel_switch ch_switch;
1131 int res;
1132
1133 sdata_assert_lock(sdata);
1134
1135 if (!cbss)
1136 return;
1137
1138 if (local->scanning)
1139 return;
1140
1141 /* disregard subsequent announcements if we are already processing */
1142 if (sdata->vif.csa_active)
1143 return;
1144
1145 current_band = cbss->channel->band;
1146 memset(&csa_ie, 0, sizeof(csa_ie));
1147 res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
1148 ifmgd->flags,
1149 ifmgd->associated->bssid, &csa_ie);
1150 if (res < 0)
1151 ieee80211_queue_work(&local->hw,
1152 &ifmgd->csa_connection_drop_work);
1153 if (res)
1154 return;
1155
1156 if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1157 IEEE80211_CHAN_DISABLED)) {
1158 sdata_info(sdata,
1159 "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1160 ifmgd->associated->bssid,
1161 csa_ie.chandef.chan->center_freq,
1162 csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1163 csa_ie.chandef.center_freq2);
1164 ieee80211_queue_work(&local->hw,
1165 &ifmgd->csa_connection_drop_work);
1166 return;
1167 }
1168
1169 if (cfg80211_chandef_identical(&csa_ie.chandef,
1170 &sdata->vif.bss_conf.chandef)) {
1171 if (ifmgd->csa_ignored_same_chan)
1172 return;
1173 sdata_info(sdata,
1174 "AP %pM tries to chanswitch to same channel, ignore\n",
1175 ifmgd->associated->bssid);
1176 ifmgd->csa_ignored_same_chan = true;
1177 return;
1178 }
1179
1180 /*
1181 * Drop all TDLS peers - either we disconnect or move to a different
1182 * channel from this point on. There's no telling what our peer will do.
1183 * The TDLS WIDER_BW scenario is also problematic, as peers might now
1184 * have an incompatible wider chandef.
1185 */
1186 ieee80211_teardown_tdls_peers(sdata);
1187
1188 mutex_lock(&local->mtx);
1189 mutex_lock(&local->chanctx_mtx);
1190 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1191 lockdep_is_held(&local->chanctx_mtx));
1192 if (!conf) {
1193 sdata_info(sdata,
1194 "no channel context assigned to vif?, disconnecting\n");
1195 goto drop_connection;
1196 }
1197
1198 chanctx = container_of(conf, struct ieee80211_chanctx, conf);
1199
1200 if (local->use_chanctx &&
1201 !ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA)) {
1202 sdata_info(sdata,
1203 "driver doesn't support chan-switch with channel contexts\n");
1204 goto drop_connection;
1205 }
1206
1207 ch_switch.timestamp = timestamp;
1208 ch_switch.device_timestamp = device_timestamp;
1209 ch_switch.block_tx = csa_ie.mode;
1210 ch_switch.chandef = csa_ie.chandef;
1211 ch_switch.count = csa_ie.count;
1212
1213 if (drv_pre_channel_switch(sdata, &ch_switch)) {
1214 sdata_info(sdata,
1215 "preparing for channel switch failed, disconnecting\n");
1216 goto drop_connection;
1217 }
1218
1219 res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
1220 chanctx->mode, false);
1221 if (res) {
1222 sdata_info(sdata,
1223 "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
1224 res);
1225 goto drop_connection;
1226 }
1227 mutex_unlock(&local->chanctx_mtx);
1228
1229 sdata->vif.csa_active = true;
1230 sdata->csa_chandef = csa_ie.chandef;
1231 sdata->csa_block_tx = csa_ie.mode;
1232 ifmgd->csa_ignored_same_chan = false;
1233
1234 if (sdata->csa_block_tx)
1235 ieee80211_stop_vif_queues(local, sdata,
1236 IEEE80211_QUEUE_STOP_REASON_CSA);
1237 mutex_unlock(&local->mtx);
1238
1239 cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
1240 csa_ie.count);
1241
1242 if (local->ops->channel_switch) {
1243 /* use driver's channel switch callback */
1244 drv_channel_switch(local, sdata, &ch_switch);
1245 return;
1246 }
1247
1248 /* channel switch handled in software */
1249 if (csa_ie.count <= 1)
1250 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1251 else
1252 mod_timer(&ifmgd->chswitch_timer,
1253 TU_TO_EXP_TIME((csa_ie.count - 1) *
1254 cbss->beacon_interval));
1255 return;
1256 drop_connection:
1257 ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work);
1258 mutex_unlock(&local->chanctx_mtx);
1259 mutex_unlock(&local->mtx);
1260 }
1261
1262 static bool
1263 ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
1264 struct ieee80211_channel *channel,
1265 const u8 *country_ie, u8 country_ie_len,
1266 const u8 *pwr_constr_elem,
1267 int *chan_pwr, int *pwr_reduction)
1268 {
1269 struct ieee80211_country_ie_triplet *triplet;
1270 int chan = ieee80211_frequency_to_channel(channel->center_freq);
1271 int i, chan_increment;
1272 bool have_chan_pwr = false;
1273
1274 /* Invalid IE */
1275 if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1276 return false;
1277
1278 triplet = (void *)(country_ie + 3);
1279 country_ie_len -= 3;
1280
1281 switch (channel->band) {
1282 default:
1283 WARN_ON_ONCE(1);
1284 /* fall through */
1285 case IEEE80211_BAND_2GHZ:
1286 case IEEE80211_BAND_60GHZ:
1287 chan_increment = 1;
1288 break;
1289 case IEEE80211_BAND_5GHZ:
1290 chan_increment = 4;
1291 break;
1292 }
1293
1294 /* find channel */
1295 while (country_ie_len >= 3) {
1296 u8 first_channel = triplet->chans.first_channel;
1297
1298 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1299 goto next;
1300
1301 for (i = 0; i < triplet->chans.num_channels; i++) {
1302 if (first_channel + i * chan_increment == chan) {
1303 have_chan_pwr = true;
1304 *chan_pwr = triplet->chans.max_power;
1305 break;
1306 }
1307 }
1308 if (have_chan_pwr)
1309 break;
1310
1311 next:
1312 triplet++;
1313 country_ie_len -= 3;
1314 }
1315
1316 if (have_chan_pwr && pwr_constr_elem)
1317 *pwr_reduction = *pwr_constr_elem;
1318 else
1319 *pwr_reduction = 0;
1320
1321 return have_chan_pwr;
1322 }
1323
1324 static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata,
1325 struct ieee80211_channel *channel,
1326 const u8 *cisco_dtpc_ie,
1327 int *pwr_level)
1328 {
1329 /* From practical testing, the first data byte of the DTPC element
1330 * seems to contain the requested dBm level, and the CLI on Cisco
1331 * APs clearly state the range is -127 to 127 dBm, which indicates
1332 * a signed byte, although it seemingly never actually goes negative.
1333 * The other byte seems to always be zero.
1334 */
1335 *pwr_level = (__s8)cisco_dtpc_ie[4];
1336 }
1337
1338 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1339 struct ieee80211_channel *channel,
1340 struct ieee80211_mgmt *mgmt,
1341 const u8 *country_ie, u8 country_ie_len,
1342 const u8 *pwr_constr_ie,
1343 const u8 *cisco_dtpc_ie)
1344 {
1345 bool has_80211h_pwr = false, has_cisco_pwr = false;
1346 int chan_pwr = 0, pwr_reduction_80211h = 0;
1347 int pwr_level_cisco, pwr_level_80211h;
1348 int new_ap_level;
1349 __le16 capab = mgmt->u.probe_resp.capab_info;
1350
1351 if (country_ie &&
1352 (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) ||
1353 capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) {
1354 has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
1355 sdata, channel, country_ie, country_ie_len,
1356 pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1357 pwr_level_80211h =
1358 max_t(int, 0, chan_pwr - pwr_reduction_80211h);
1359 }
1360
1361 if (cisco_dtpc_ie) {
1362 ieee80211_find_cisco_dtpc(
1363 sdata, channel, cisco_dtpc_ie, &pwr_level_cisco);
1364 has_cisco_pwr = true;
1365 }
1366
1367 if (!has_80211h_pwr && !has_cisco_pwr)
1368 return 0;
1369
1370 /* If we have both 802.11h and Cisco DTPC, apply both limits
1371 * by picking the smallest of the two power levels advertised.
1372 */
1373 if (has_80211h_pwr &&
1374 (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) {
1375 sdata_dbg(sdata,
1376 "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1377 pwr_level_80211h, chan_pwr, pwr_reduction_80211h,
1378 sdata->u.mgd.bssid);
1379 new_ap_level = pwr_level_80211h;
1380 } else { /* has_cisco_pwr is always true here. */
1381 sdata_dbg(sdata,
1382 "Limiting TX power to %d dBm as advertised by %pM\n",
1383 pwr_level_cisco, sdata->u.mgd.bssid);
1384 new_ap_level = pwr_level_cisco;
1385 }
1386
1387 if (sdata->ap_power_level == new_ap_level)
1388 return 0;
1389
1390 sdata->ap_power_level = new_ap_level;
1391 if (__ieee80211_recalc_txpower(sdata))
1392 return BSS_CHANGED_TXPOWER;
1393 return 0;
1394 }
1395
1396 /* powersave */
1397 static void ieee80211_enable_ps(struct ieee80211_local *local,
1398 struct ieee80211_sub_if_data *sdata)
1399 {
1400 struct ieee80211_conf *conf = &local->hw.conf;
1401
1402 /*
1403 * If we are scanning right now then the parameters will
1404 * take effect when scan finishes.
1405 */
1406 if (local->scanning)
1407 return;
1408
1409 if (conf->dynamic_ps_timeout > 0 &&
1410 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) {
1411 mod_timer(&local->dynamic_ps_timer, jiffies +
1412 msecs_to_jiffies(conf->dynamic_ps_timeout));
1413 } else {
1414 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
1415 ieee80211_send_nullfunc(local, sdata, 1);
1416
1417 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1418 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
1419 return;
1420
1421 conf->flags |= IEEE80211_CONF_PS;
1422 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1423 }
1424 }
1425
1426 static void ieee80211_change_ps(struct ieee80211_local *local)
1427 {
1428 struct ieee80211_conf *conf = &local->hw.conf;
1429
1430 if (local->ps_sdata) {
1431 ieee80211_enable_ps(local, local->ps_sdata);
1432 } else if (conf->flags & IEEE80211_CONF_PS) {
1433 conf->flags &= ~IEEE80211_CONF_PS;
1434 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1435 del_timer_sync(&local->dynamic_ps_timer);
1436 cancel_work_sync(&local->dynamic_ps_enable_work);
1437 }
1438 }
1439
1440 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1441 {
1442 struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1443 struct sta_info *sta = NULL;
1444 bool authorized = false;
1445
1446 if (!mgd->powersave)
1447 return false;
1448
1449 if (mgd->broken_ap)
1450 return false;
1451
1452 if (!mgd->associated)
1453 return false;
1454
1455 if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1456 return false;
1457
1458 if (!mgd->have_beacon)
1459 return false;
1460
1461 rcu_read_lock();
1462 sta = sta_info_get(sdata, mgd->bssid);
1463 if (sta)
1464 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1465 rcu_read_unlock();
1466
1467 return authorized;
1468 }
1469
1470 /* need to hold RTNL or interface lock */
1471 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1472 {
1473 struct ieee80211_sub_if_data *sdata, *found = NULL;
1474 int count = 0;
1475 int timeout;
1476
1477 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) {
1478 local->ps_sdata = NULL;
1479 return;
1480 }
1481
1482 list_for_each_entry(sdata, &local->interfaces, list) {
1483 if (!ieee80211_sdata_running(sdata))
1484 continue;
1485 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1486 /* If an AP vif is found, then disable PS
1487 * by setting the count to zero thereby setting
1488 * ps_sdata to NULL.
1489 */
1490 count = 0;
1491 break;
1492 }
1493 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1494 continue;
1495 found = sdata;
1496 count++;
1497 }
1498
1499 if (count == 1 && ieee80211_powersave_allowed(found)) {
1500 s32 beaconint_us;
1501
1502 if (latency < 0)
1503 latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1504
1505 beaconint_us = ieee80211_tu_to_usec(
1506 found->vif.bss_conf.beacon_int);
1507
1508 timeout = local->dynamic_ps_forced_timeout;
1509 if (timeout < 0) {
1510 /*
1511 * Go to full PSM if the user configures a very low
1512 * latency requirement.
1513 * The 2000 second value is there for compatibility
1514 * until the PM_QOS_NETWORK_LATENCY is configured
1515 * with real values.
1516 */
1517 if (latency > (1900 * USEC_PER_MSEC) &&
1518 latency != (2000 * USEC_PER_SEC))
1519 timeout = 0;
1520 else
1521 timeout = 100;
1522 }
1523 local->hw.conf.dynamic_ps_timeout = timeout;
1524
1525 if (beaconint_us > latency) {
1526 local->ps_sdata = NULL;
1527 } else {
1528 int maxslp = 1;
1529 u8 dtimper = found->u.mgd.dtim_period;
1530
1531 /* If the TIM IE is invalid, pretend the value is 1 */
1532 if (!dtimper)
1533 dtimper = 1;
1534 else if (dtimper > 1)
1535 maxslp = min_t(int, dtimper,
1536 latency / beaconint_us);
1537
1538 local->hw.conf.max_sleep_period = maxslp;
1539 local->hw.conf.ps_dtim_period = dtimper;
1540 local->ps_sdata = found;
1541 }
1542 } else {
1543 local->ps_sdata = NULL;
1544 }
1545
1546 ieee80211_change_ps(local);
1547 }
1548
1549 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1550 {
1551 bool ps_allowed = ieee80211_powersave_allowed(sdata);
1552
1553 if (sdata->vif.bss_conf.ps != ps_allowed) {
1554 sdata->vif.bss_conf.ps = ps_allowed;
1555 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1556 }
1557 }
1558
1559 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1560 {
1561 struct ieee80211_local *local =
1562 container_of(work, struct ieee80211_local,
1563 dynamic_ps_disable_work);
1564
1565 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1566 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1567 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1568 }
1569
1570 ieee80211_wake_queues_by_reason(&local->hw,
1571 IEEE80211_MAX_QUEUE_MAP,
1572 IEEE80211_QUEUE_STOP_REASON_PS,
1573 false);
1574 }
1575
1576 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1577 {
1578 struct ieee80211_local *local =
1579 container_of(work, struct ieee80211_local,
1580 dynamic_ps_enable_work);
1581 struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1582 struct ieee80211_if_managed *ifmgd;
1583 unsigned long flags;
1584 int q;
1585
1586 /* can only happen when PS was just disabled anyway */
1587 if (!sdata)
1588 return;
1589
1590 ifmgd = &sdata->u.mgd;
1591
1592 if (local->hw.conf.flags & IEEE80211_CONF_PS)
1593 return;
1594
1595 if (local->hw.conf.dynamic_ps_timeout > 0) {
1596 /* don't enter PS if TX frames are pending */
1597 if (drv_tx_frames_pending(local)) {
1598 mod_timer(&local->dynamic_ps_timer, jiffies +
1599 msecs_to_jiffies(
1600 local->hw.conf.dynamic_ps_timeout));
1601 return;
1602 }
1603
1604 /*
1605 * transmission can be stopped by others which leads to
1606 * dynamic_ps_timer expiry. Postpone the ps timer if it
1607 * is not the actual idle state.
1608 */
1609 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1610 for (q = 0; q < local->hw.queues; q++) {
1611 if (local->queue_stop_reasons[q]) {
1612 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1613 flags);
1614 mod_timer(&local->dynamic_ps_timer, jiffies +
1615 msecs_to_jiffies(
1616 local->hw.conf.dynamic_ps_timeout));
1617 return;
1618 }
1619 }
1620 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1621 }
1622
1623 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1624 !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1625 if (drv_tx_frames_pending(local)) {
1626 mod_timer(&local->dynamic_ps_timer, jiffies +
1627 msecs_to_jiffies(
1628 local->hw.conf.dynamic_ps_timeout));
1629 } else {
1630 ieee80211_send_nullfunc(local, sdata, 1);
1631 /* Flush to get the tx status of nullfunc frame */
1632 ieee80211_flush_queues(local, sdata, false);
1633 }
1634 }
1635
1636 if (!(ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
1637 ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) ||
1638 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1639 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1640 local->hw.conf.flags |= IEEE80211_CONF_PS;
1641 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1642 }
1643 }
1644
1645 void ieee80211_dynamic_ps_timer(unsigned long data)
1646 {
1647 struct ieee80211_local *local = (void *) data;
1648
1649 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1650 }
1651
1652 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1653 {
1654 struct delayed_work *delayed_work =
1655 container_of(work, struct delayed_work, work);
1656 struct ieee80211_sub_if_data *sdata =
1657 container_of(delayed_work, struct ieee80211_sub_if_data,
1658 dfs_cac_timer_work);
1659 struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1660
1661 mutex_lock(&sdata->local->mtx);
1662 if (sdata->wdev.cac_started) {
1663 ieee80211_vif_release_channel(sdata);
1664 cfg80211_cac_event(sdata->dev, &chandef,
1665 NL80211_RADAR_CAC_FINISHED,
1666 GFP_KERNEL);
1667 }
1668 mutex_unlock(&sdata->local->mtx);
1669 }
1670
1671 static bool
1672 __ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1673 {
1674 struct ieee80211_local *local = sdata->local;
1675 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1676 bool ret = false;
1677 int ac;
1678
1679 if (local->hw.queues < IEEE80211_NUM_ACS)
1680 return false;
1681
1682 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1683 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
1684 int non_acm_ac;
1685 unsigned long now = jiffies;
1686
1687 if (tx_tspec->action == TX_TSPEC_ACTION_NONE &&
1688 tx_tspec->admitted_time &&
1689 time_after(now, tx_tspec->time_slice_start + HZ)) {
1690 tx_tspec->consumed_tx_time = 0;
1691 tx_tspec->time_slice_start = now;
1692
1693 if (tx_tspec->downgraded)
1694 tx_tspec->action =
1695 TX_TSPEC_ACTION_STOP_DOWNGRADE;
1696 }
1697
1698 switch (tx_tspec->action) {
1699 case TX_TSPEC_ACTION_STOP_DOWNGRADE:
1700 /* take the original parameters */
1701 if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac]))
1702 sdata_err(sdata,
1703 "failed to set TX queue parameters for queue %d\n",
1704 ac);
1705 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1706 tx_tspec->downgraded = false;
1707 ret = true;
1708 break;
1709 case TX_TSPEC_ACTION_DOWNGRADE:
1710 if (time_after(now, tx_tspec->time_slice_start + HZ)) {
1711 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1712 ret = true;
1713 break;
1714 }
1715 /* downgrade next lower non-ACM AC */
1716 for (non_acm_ac = ac + 1;
1717 non_acm_ac < IEEE80211_NUM_ACS;
1718 non_acm_ac++)
1719 if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac)))
1720 break;
1721 /* The loop will result in using BK even if it requires
1722 * admission control, such configuration makes no sense
1723 * and we have to transmit somehow - the AC selection
1724 * does the same thing.
1725 */
1726 if (drv_conf_tx(local, sdata, ac,
1727 &sdata->tx_conf[non_acm_ac]))
1728 sdata_err(sdata,
1729 "failed to set TX queue parameters for queue %d\n",
1730 ac);
1731 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1732 ret = true;
1733 schedule_delayed_work(&ifmgd->tx_tspec_wk,
1734 tx_tspec->time_slice_start + HZ - now + 1);
1735 break;
1736 case TX_TSPEC_ACTION_NONE:
1737 /* nothing now */
1738 break;
1739 }
1740 }
1741
1742 return ret;
1743 }
1744
1745 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1746 {
1747 if (__ieee80211_sta_handle_tspec_ac_params(sdata))
1748 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
1749 }
1750
1751 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work)
1752 {
1753 struct ieee80211_sub_if_data *sdata;
1754
1755 sdata = container_of(work, struct ieee80211_sub_if_data,
1756 u.mgd.tx_tspec_wk.work);
1757 ieee80211_sta_handle_tspec_ac_params(sdata);
1758 }
1759
1760 /* MLME */
1761 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1762 struct ieee80211_sub_if_data *sdata,
1763 const u8 *wmm_param, size_t wmm_param_len)
1764 {
1765 struct ieee80211_tx_queue_params params;
1766 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1767 size_t left;
1768 int count;
1769 const u8 *pos;
1770 u8 uapsd_queues = 0;
1771
1772 if (!local->ops->conf_tx)
1773 return false;
1774
1775 if (local->hw.queues < IEEE80211_NUM_ACS)
1776 return false;
1777
1778 if (!wmm_param)
1779 return false;
1780
1781 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1782 return false;
1783
1784 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1785 uapsd_queues = ifmgd->uapsd_queues;
1786
1787 count = wmm_param[6] & 0x0f;
1788 if (count == ifmgd->wmm_last_param_set)
1789 return false;
1790 ifmgd->wmm_last_param_set = count;
1791
1792 pos = wmm_param + 8;
1793 left = wmm_param_len - 8;
1794
1795 memset(&params, 0, sizeof(params));
1796
1797 sdata->wmm_acm = 0;
1798 for (; left >= 4; left -= 4, pos += 4) {
1799 int aci = (pos[0] >> 5) & 0x03;
1800 int acm = (pos[0] >> 4) & 0x01;
1801 bool uapsd = false;
1802 int queue;
1803
1804 switch (aci) {
1805 case 1: /* AC_BK */
1806 queue = 3;
1807 if (acm)
1808 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1809 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1810 uapsd = true;
1811 break;
1812 case 2: /* AC_VI */
1813 queue = 1;
1814 if (acm)
1815 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1816 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1817 uapsd = true;
1818 break;
1819 case 3: /* AC_VO */
1820 queue = 0;
1821 if (acm)
1822 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1823 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1824 uapsd = true;
1825 break;
1826 case 0: /* AC_BE */
1827 default:
1828 queue = 2;
1829 if (acm)
1830 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1831 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1832 uapsd = true;
1833 break;
1834 }
1835
1836 params.aifs = pos[0] & 0x0f;
1837 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1838 params.cw_min = ecw2cw(pos[1] & 0x0f);
1839 params.txop = get_unaligned_le16(pos + 2);
1840 params.acm = acm;
1841 params.uapsd = uapsd;
1842
1843 mlme_dbg(sdata,
1844 "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n",
1845 queue, aci, acm,
1846 params.aifs, params.cw_min, params.cw_max,
1847 params.txop, params.uapsd,
1848 ifmgd->tx_tspec[queue].downgraded);
1849 sdata->tx_conf[queue] = params;
1850 if (!ifmgd->tx_tspec[queue].downgraded &&
1851 drv_conf_tx(local, sdata, queue, &params))
1852 sdata_err(sdata,
1853 "failed to set TX queue parameters for queue %d\n",
1854 queue);
1855 }
1856
1857 /* enable WMM or activate new settings */
1858 sdata->vif.bss_conf.qos = true;
1859 return true;
1860 }
1861
1862 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1863 {
1864 lockdep_assert_held(&sdata->local->mtx);
1865
1866 sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1867 ieee80211_run_deferred_scan(sdata->local);
1868 }
1869
1870 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1871 {
1872 mutex_lock(&sdata->local->mtx);
1873 __ieee80211_stop_poll(sdata);
1874 mutex_unlock(&sdata->local->mtx);
1875 }
1876
1877 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1878 u16 capab, bool erp_valid, u8 erp)
1879 {
1880 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1881 u32 changed = 0;
1882 bool use_protection;
1883 bool use_short_preamble;
1884 bool use_short_slot;
1885
1886 if (erp_valid) {
1887 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1888 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1889 } else {
1890 use_protection = false;
1891 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1892 }
1893
1894 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1895 if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1896 use_short_slot = true;
1897
1898 if (use_protection != bss_conf->use_cts_prot) {
1899 bss_conf->use_cts_prot = use_protection;
1900 changed |= BSS_CHANGED_ERP_CTS_PROT;
1901 }
1902
1903 if (use_short_preamble != bss_conf->use_short_preamble) {
1904 bss_conf->use_short_preamble = use_short_preamble;
1905 changed |= BSS_CHANGED_ERP_PREAMBLE;
1906 }
1907
1908 if (use_short_slot != bss_conf->use_short_slot) {
1909 bss_conf->use_short_slot = use_short_slot;
1910 changed |= BSS_CHANGED_ERP_SLOT;
1911 }
1912
1913 return changed;
1914 }
1915
1916 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1917 struct cfg80211_bss *cbss,
1918 u32 bss_info_changed)
1919 {
1920 struct ieee80211_bss *bss = (void *)cbss->priv;
1921 struct ieee80211_local *local = sdata->local;
1922 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1923
1924 bss_info_changed |= BSS_CHANGED_ASSOC;
1925 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1926 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1927
1928 sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1929 beacon_loss_count * bss_conf->beacon_int));
1930
1931 sdata->u.mgd.associated = cbss;
1932 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1933
1934 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1935
1936 if (sdata->vif.p2p) {
1937 const struct cfg80211_bss_ies *ies;
1938
1939 rcu_read_lock();
1940 ies = rcu_dereference(cbss->ies);
1941 if (ies) {
1942 int ret;
1943
1944 ret = cfg80211_get_p2p_attr(
1945 ies->data, ies->len,
1946 IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1947 (u8 *) &bss_conf->p2p_noa_attr,
1948 sizeof(bss_conf->p2p_noa_attr));
1949 if (ret >= 2) {
1950 sdata->u.mgd.p2p_noa_index =
1951 bss_conf->p2p_noa_attr.index;
1952 bss_info_changed |= BSS_CHANGED_P2P_PS;
1953 }
1954 }
1955 rcu_read_unlock();
1956 }
1957
1958 /* just to be sure */
1959 ieee80211_stop_poll(sdata);
1960
1961 ieee80211_led_assoc(local, 1);
1962
1963 if (sdata->u.mgd.have_beacon) {
1964 /*
1965 * If the AP is buggy we may get here with no DTIM period
1966 * known, so assume it's 1 which is the only safe assumption
1967 * in that case, although if the TIM IE is broken powersave
1968 * probably just won't work at all.
1969 */
1970 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1971 bss_conf->beacon_rate = bss->beacon_rate;
1972 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1973 } else {
1974 bss_conf->beacon_rate = NULL;
1975 bss_conf->dtim_period = 0;
1976 }
1977
1978 bss_conf->assoc = 1;
1979
1980 /* Tell the driver to monitor connection quality (if supported) */
1981 if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1982 bss_conf->cqm_rssi_thold)
1983 bss_info_changed |= BSS_CHANGED_CQM;
1984
1985 /* Enable ARP filtering */
1986 if (bss_conf->arp_addr_cnt)
1987 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1988
1989 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1990
1991 mutex_lock(&local->iflist_mtx);
1992 ieee80211_recalc_ps(local, -1);
1993 mutex_unlock(&local->iflist_mtx);
1994
1995 ieee80211_recalc_smps(sdata);
1996 ieee80211_recalc_ps_vif(sdata);
1997
1998 netif_carrier_on(sdata->dev);
1999 }
2000
2001 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
2002 u16 stype, u16 reason, bool tx,
2003 u8 *frame_buf)
2004 {
2005 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2006 struct ieee80211_local *local = sdata->local;
2007 u32 changed = 0;
2008
2009 sdata_assert_lock(sdata);
2010
2011 if (WARN_ON_ONCE(tx && !frame_buf))
2012 return;
2013
2014 if (WARN_ON(!ifmgd->associated))
2015 return;
2016
2017 ieee80211_stop_poll(sdata);
2018
2019 ifmgd->associated = NULL;
2020 netif_carrier_off(sdata->dev);
2021
2022 /*
2023 * if we want to get out of ps before disassoc (why?) we have
2024 * to do it before sending disassoc, as otherwise the null-packet
2025 * won't be valid.
2026 */
2027 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2028 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2029 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2030 }
2031 local->ps_sdata = NULL;
2032
2033 /* disable per-vif ps */
2034 ieee80211_recalc_ps_vif(sdata);
2035
2036 /* make sure ongoing transmission finishes */
2037 synchronize_net();
2038
2039 /*
2040 * drop any frame before deauth/disassoc, this can be data or
2041 * management frame. Since we are disconnecting, we should not
2042 * insist sending these frames which can take time and delay
2043 * the disconnection and possible the roaming.
2044 */
2045 if (tx)
2046 ieee80211_flush_queues(local, sdata, true);
2047
2048 /* deauthenticate/disassociate now */
2049 if (tx || frame_buf)
2050 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
2051 reason, tx, frame_buf);
2052
2053 /* flush out frame - make sure the deauth was actually sent */
2054 if (tx)
2055 ieee80211_flush_queues(local, sdata, false);
2056
2057 /* clear bssid only after building the needed mgmt frames */
2058 eth_zero_addr(ifmgd->bssid);
2059
2060 /* remove AP and TDLS peers */
2061 sta_info_flush(sdata);
2062
2063 /* finally reset all BSS / config parameters */
2064 changed |= ieee80211_reset_erp_info(sdata);
2065
2066 ieee80211_led_assoc(local, 0);
2067 changed |= BSS_CHANGED_ASSOC;
2068 sdata->vif.bss_conf.assoc = false;
2069
2070 ifmgd->p2p_noa_index = -1;
2071 memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
2072 sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2073
2074 /* on the next assoc, re-program HT/VHT parameters */
2075 memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
2076 memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2077 memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
2078 memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2079
2080 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2081
2082 del_timer_sync(&local->dynamic_ps_timer);
2083 cancel_work_sync(&local->dynamic_ps_enable_work);
2084
2085 /* Disable ARP filtering */
2086 if (sdata->vif.bss_conf.arp_addr_cnt)
2087 changed |= BSS_CHANGED_ARP_FILTER;
2088
2089 sdata->vif.bss_conf.qos = false;
2090 changed |= BSS_CHANGED_QOS;
2091
2092 /* The BSSID (not really interesting) and HT changed */
2093 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
2094 ieee80211_bss_info_change_notify(sdata, changed);
2095
2096 /* disassociated - set to defaults now */
2097 ieee80211_set_wmm_default(sdata, false);
2098
2099 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
2100 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
2101 del_timer_sync(&sdata->u.mgd.timer);
2102 del_timer_sync(&sdata->u.mgd.chswitch_timer);
2103
2104 sdata->vif.bss_conf.dtim_period = 0;
2105 sdata->vif.bss_conf.beacon_rate = NULL;
2106
2107 ifmgd->have_beacon = false;
2108
2109 ifmgd->flags = 0;
2110 mutex_lock(&local->mtx);
2111 ieee80211_vif_release_channel(sdata);
2112
2113 sdata->vif.csa_active = false;
2114 ifmgd->csa_waiting_bcn = false;
2115 ifmgd->csa_ignored_same_chan = false;
2116 if (sdata->csa_block_tx) {
2117 ieee80211_wake_vif_queues(local, sdata,
2118 IEEE80211_QUEUE_STOP_REASON_CSA);
2119 sdata->csa_block_tx = false;
2120 }
2121 mutex_unlock(&local->mtx);
2122
2123 /* existing TX TSPEC sessions no longer exist */
2124 memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
2125 cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);
2126
2127 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2128 }
2129
2130 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
2131 struct ieee80211_hdr *hdr)
2132 {
2133 /*
2134 * We can postpone the mgd.timer whenever receiving unicast frames
2135 * from AP because we know that the connection is working both ways
2136 * at that time. But multicast frames (and hence also beacons) must
2137 * be ignored here, because we need to trigger the timer during
2138 * data idle periods for sending the periodic probe request to the
2139 * AP we're connected to.
2140 */
2141 if (is_multicast_ether_addr(hdr->addr1))
2142 return;
2143
2144 ieee80211_sta_reset_conn_monitor(sdata);
2145 }
2146
2147 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
2148 {
2149 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2150 struct ieee80211_local *local = sdata->local;
2151
2152 mutex_lock(&local->mtx);
2153 if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
2154 goto out;
2155
2156 __ieee80211_stop_poll(sdata);
2157
2158 mutex_lock(&local->iflist_mtx);
2159 ieee80211_recalc_ps(local, -1);
2160 mutex_unlock(&local->iflist_mtx);
2161
2162 if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
2163 goto out;
2164
2165 /*
2166 * We've received a probe response, but are not sure whether
2167 * we have or will be receiving any beacons or data, so let's
2168 * schedule the timers again, just in case.
2169 */
2170 ieee80211_sta_reset_beacon_monitor(sdata);
2171
2172 mod_timer(&ifmgd->conn_mon_timer,
2173 round_jiffies_up(jiffies +
2174 IEEE80211_CONNECTION_IDLE_TIME));
2175 out:
2176 mutex_unlock(&local->mtx);
2177 }
2178
2179 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
2180 struct ieee80211_hdr *hdr,
2181 u16 tx_time)
2182 {
2183 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2184 u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2185 int ac = ieee80211_ac_from_tid(tid);
2186 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
2187 unsigned long now = jiffies;
2188
2189 if (likely(!tx_tspec->admitted_time))
2190 return;
2191
2192 if (time_after(now, tx_tspec->time_slice_start + HZ)) {
2193 tx_tspec->consumed_tx_time = 0;
2194 tx_tspec->time_slice_start = now;
2195
2196 if (tx_tspec->downgraded) {
2197 tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE;
2198 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2199 }
2200 }
2201
2202 if (tx_tspec->downgraded)
2203 return;
2204
2205 tx_tspec->consumed_tx_time += tx_time;
2206
2207 if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) {
2208 tx_tspec->downgraded = true;
2209 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE;
2210 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2211 }
2212 }
2213
2214 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2215 struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2216 {
2217 ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);
2218
2219 if (!ieee80211_is_data(hdr->frame_control))
2220 return;
2221
2222 if (ieee80211_is_nullfunc(hdr->frame_control) &&
2223 sdata->u.mgd.probe_send_count > 0) {
2224 if (ack)
2225 ieee80211_sta_reset_conn_monitor(sdata);
2226 else
2227 sdata->u.mgd.nullfunc_failed = true;
2228 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2229 return;
2230 }
2231
2232 if (ack)
2233 ieee80211_sta_reset_conn_monitor(sdata);
2234 }
2235
2236 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
2237 {
2238 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2239 const u8 *ssid;
2240 u8 *dst = ifmgd->associated->bssid;
2241 u8 unicast_limit = max(1, max_probe_tries - 3);
2242
2243 /*
2244 * Try sending broadcast probe requests for the last three
2245 * probe requests after the first ones failed since some
2246 * buggy APs only support broadcast probe requests.
2247 */
2248 if (ifmgd->probe_send_count >= unicast_limit)
2249 dst = NULL;
2250
2251 /*
2252 * When the hardware reports an accurate Tx ACK status, it's
2253 * better to send a nullfunc frame instead of a probe request,
2254 * as it will kick us off the AP quickly if we aren't associated
2255 * anymore. The timeout will be reset if the frame is ACKed by
2256 * the AP.
2257 */
2258 ifmgd->probe_send_count++;
2259
2260 if (ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
2261 ifmgd->nullfunc_failed = false;
2262 ieee80211_send_nullfunc(sdata->local, sdata, 0);
2263 } else {
2264 int ssid_len;
2265
2266 rcu_read_lock();
2267 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2268 if (WARN_ON_ONCE(ssid == NULL))
2269 ssid_len = 0;
2270 else
2271 ssid_len = ssid[1];
2272
2273 ieee80211_send_probe_req(sdata, sdata->vif.addr, dst,
2274 ssid + 2, ssid_len, NULL,
2275 0, (u32) -1, true, 0,
2276 ifmgd->associated->channel, false);
2277 rcu_read_unlock();
2278 }
2279
2280 ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2281 run_again(sdata, ifmgd->probe_timeout);
2282 }
2283
2284 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
2285 bool beacon)
2286 {
2287 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2288 bool already = false;
2289
2290 if (!ieee80211_sdata_running(sdata))
2291 return;
2292
2293 sdata_lock(sdata);
2294
2295 if (!ifmgd->associated)
2296 goto out;
2297
2298 mutex_lock(&sdata->local->mtx);
2299
2300 if (sdata->local->tmp_channel || sdata->local->scanning) {
2301 mutex_unlock(&sdata->local->mtx);
2302 goto out;
2303 }
2304
2305 if (beacon) {
2306 mlme_dbg_ratelimited(sdata,
2307 "detected beacon loss from AP (missed %d beacons) - probing\n",
2308 beacon_loss_count);
2309
2310 ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL);
2311 }
2312
2313 /*
2314 * The driver/our work has already reported this event or the
2315 * connection monitoring has kicked in and we have already sent
2316 * a probe request. Or maybe the AP died and the driver keeps
2317 * reporting until we disassociate...
2318 *
2319 * In either case we have to ignore the current call to this
2320 * function (except for setting the correct probe reason bit)
2321 * because otherwise we would reset the timer every time and
2322 * never check whether we received a probe response!
2323 */
2324 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
2325 already = true;
2326
2327 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2328
2329 mutex_unlock(&sdata->local->mtx);
2330
2331 if (already)
2332 goto out;
2333
2334 mutex_lock(&sdata->local->iflist_mtx);
2335 ieee80211_recalc_ps(sdata->local, -1);
2336 mutex_unlock(&sdata->local->iflist_mtx);
2337
2338 ifmgd->probe_send_count = 0;
2339 ieee80211_mgd_probe_ap_send(sdata);
2340 out:
2341 sdata_unlock(sdata);
2342 }
2343
2344 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2345 struct ieee80211_vif *vif)
2346 {
2347 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2348 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2349 struct cfg80211_bss *cbss;
2350 struct sk_buff *skb;
2351 const u8 *ssid;
2352 int ssid_len;
2353
2354 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2355 return NULL;
2356
2357 sdata_assert_lock(sdata);
2358
2359 if (ifmgd->associated)
2360 cbss = ifmgd->associated;
2361 else if (ifmgd->auth_data)
2362 cbss = ifmgd->auth_data->bss;
2363 else if (ifmgd->assoc_data)
2364 cbss = ifmgd->assoc_data->bss;
2365 else
2366 return NULL;
2367
2368 rcu_read_lock();
2369 ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2370 if (WARN_ON_ONCE(ssid == NULL))
2371 ssid_len = 0;
2372 else
2373 ssid_len = ssid[1];
2374
2375 skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
2376 (u32) -1, cbss->channel,
2377 ssid + 2, ssid_len,
2378 NULL, 0, true);
2379 rcu_read_unlock();
2380
2381 return skb;
2382 }
2383 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2384
2385 static void ieee80211_report_disconnect(struct ieee80211_sub_if_data *sdata,
2386 const u8 *buf, size_t len, bool tx,
2387 u16 reason)
2388 {
2389 struct ieee80211_event event = {
2390 .type = MLME_EVENT,
2391 .u.mlme.data = tx ? DEAUTH_TX_EVENT : DEAUTH_RX_EVENT,
2392 .u.mlme.reason = reason,
2393 };
2394
2395 if (tx)
2396 cfg80211_tx_mlme_mgmt(sdata->dev, buf, len);
2397 else
2398 cfg80211_rx_mlme_mgmt(sdata->dev, buf, len);
2399
2400 drv_event_callback(sdata->local, sdata, &event);
2401 }
2402
2403 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2404 {
2405 struct ieee80211_local *local = sdata->local;
2406 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2407 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2408
2409 sdata_lock(sdata);
2410 if (!ifmgd->associated) {
2411 sdata_unlock(sdata);
2412 return;
2413 }
2414
2415 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2416 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2417 true, frame_buf);
2418 mutex_lock(&local->mtx);
2419 sdata->vif.csa_active = false;
2420 ifmgd->csa_waiting_bcn = false;
2421 if (sdata->csa_block_tx) {
2422 ieee80211_wake_vif_queues(local, sdata,
2423 IEEE80211_QUEUE_STOP_REASON_CSA);
2424 sdata->csa_block_tx = false;
2425 }
2426 mutex_unlock(&local->mtx);
2427
2428 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
2429 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2430
2431 sdata_unlock(sdata);
2432 }
2433
2434 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2435 {
2436 struct ieee80211_sub_if_data *sdata =
2437 container_of(work, struct ieee80211_sub_if_data,
2438 u.mgd.beacon_connection_loss_work);
2439 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2440 struct sta_info *sta;
2441
2442 if (ifmgd->associated) {
2443 rcu_read_lock();
2444 sta = sta_info_get(sdata, ifmgd->bssid);
2445 if (sta)
2446 sta->beacon_loss_count++;
2447 rcu_read_unlock();
2448 }
2449
2450 if (ifmgd->connection_loss) {
2451 sdata_info(sdata, "Connection to AP %pM lost\n",
2452 ifmgd->bssid);
2453 __ieee80211_disconnect(sdata);
2454 } else {
2455 ieee80211_mgd_probe_ap(sdata, true);
2456 }
2457 }
2458
2459 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2460 {
2461 struct ieee80211_sub_if_data *sdata =
2462 container_of(work, struct ieee80211_sub_if_data,
2463 u.mgd.csa_connection_drop_work);
2464
2465 __ieee80211_disconnect(sdata);
2466 }
2467
2468 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2469 {
2470 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2471 struct ieee80211_hw *hw = &sdata->local->hw;
2472
2473 trace_api_beacon_loss(sdata);
2474
2475 sdata->u.mgd.connection_loss = false;
2476 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2477 }
2478 EXPORT_SYMBOL(ieee80211_beacon_loss);
2479
2480 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2481 {
2482 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2483 struct ieee80211_hw *hw = &sdata->local->hw;
2484
2485 trace_api_connection_loss(sdata);
2486
2487 sdata->u.mgd.connection_loss = true;
2488 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2489 }
2490 EXPORT_SYMBOL(ieee80211_connection_loss);
2491
2492
2493 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2494 bool assoc)
2495 {
2496 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2497
2498 sdata_assert_lock(sdata);
2499
2500 if (!assoc) {
2501 /*
2502 * we are not authenticated yet, the only timer that could be
2503 * running is the timeout for the authentication response which
2504 * which is not relevant anymore.
2505 */
2506 del_timer_sync(&sdata->u.mgd.timer);
2507 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2508
2509 eth_zero_addr(sdata->u.mgd.bssid);
2510 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2511 sdata->u.mgd.flags = 0;
2512 mutex_lock(&sdata->local->mtx);
2513 ieee80211_vif_release_channel(sdata);
2514 mutex_unlock(&sdata->local->mtx);
2515 }
2516
2517 cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2518 kfree(auth_data);
2519 sdata->u.mgd.auth_data = NULL;
2520 }
2521
2522 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2523 bool assoc)
2524 {
2525 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2526
2527 sdata_assert_lock(sdata);
2528
2529 if (!assoc) {
2530 /*
2531 * we are not associated yet, the only timer that could be
2532 * running is the timeout for the association response which
2533 * which is not relevant anymore.
2534 */
2535 del_timer_sync(&sdata->u.mgd.timer);
2536 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2537
2538 eth_zero_addr(sdata->u.mgd.bssid);
2539 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2540 sdata->u.mgd.flags = 0;
2541 mutex_lock(&sdata->local->mtx);
2542 ieee80211_vif_release_channel(sdata);
2543 mutex_unlock(&sdata->local->mtx);
2544 }
2545
2546 kfree(assoc_data);
2547 sdata->u.mgd.assoc_data = NULL;
2548 }
2549
2550 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2551 struct ieee80211_mgmt *mgmt, size_t len)
2552 {
2553 struct ieee80211_local *local = sdata->local;
2554 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2555 u8 *pos;
2556 struct ieee802_11_elems elems;
2557 u32 tx_flags = 0;
2558
2559 pos = mgmt->u.auth.variable;
2560 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2561 if (!elems.challenge)
2562 return;
2563 auth_data->expected_transaction = 4;
2564 drv_mgd_prepare_tx(sdata->local, sdata);
2565 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
2566 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2567 IEEE80211_TX_INTFL_MLME_CONN_TX;
2568 ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2569 elems.challenge - 2, elems.challenge_len + 2,
2570 auth_data->bss->bssid, auth_data->bss->bssid,
2571 auth_data->key, auth_data->key_len,
2572 auth_data->key_idx, tx_flags);
2573 }
2574
2575 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2576 struct ieee80211_mgmt *mgmt, size_t len)
2577 {
2578 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2579 u8 bssid[ETH_ALEN];
2580 u16 auth_alg, auth_transaction, status_code;
2581 struct sta_info *sta;
2582 struct ieee80211_event event = {
2583 .type = MLME_EVENT,
2584 .u.mlme.data = AUTH_EVENT,
2585 };
2586
2587 sdata_assert_lock(sdata);
2588
2589 if (len < 24 + 6)
2590 return;
2591
2592 if (!ifmgd->auth_data || ifmgd->auth_data->done)
2593 return;
2594
2595 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2596
2597 if (!ether_addr_equal(bssid, mgmt->bssid))
2598 return;
2599
2600 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2601 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2602 status_code = le16_to_cpu(mgmt->u.auth.status_code);
2603
2604 if (auth_alg != ifmgd->auth_data->algorithm ||
2605 auth_transaction != ifmgd->auth_data->expected_transaction) {
2606 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2607 mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2608 auth_transaction,
2609 ifmgd->auth_data->expected_transaction);
2610 return;
2611 }
2612
2613 if (status_code != WLAN_STATUS_SUCCESS) {
2614 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2615 mgmt->sa, status_code);
2616 ieee80211_destroy_auth_data(sdata, false);
2617 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2618 event.u.mlme.status = MLME_DENIED;
2619 event.u.mlme.reason = status_code;
2620 drv_event_callback(sdata->local, sdata, &event);
2621 return;
2622 }
2623
2624 switch (ifmgd->auth_data->algorithm) {
2625 case WLAN_AUTH_OPEN:
2626 case WLAN_AUTH_LEAP:
2627 case WLAN_AUTH_FT:
2628 case WLAN_AUTH_SAE:
2629 break;
2630 case WLAN_AUTH_SHARED_KEY:
2631 if (ifmgd->auth_data->expected_transaction != 4) {
2632 ieee80211_auth_challenge(sdata, mgmt, len);
2633 /* need another frame */
2634 return;
2635 }
2636 break;
2637 default:
2638 WARN_ONCE(1, "invalid auth alg %d",
2639 ifmgd->auth_data->algorithm);
2640 return;
2641 }
2642
2643 event.u.mlme.status = MLME_SUCCESS;
2644 drv_event_callback(sdata->local, sdata, &event);
2645 sdata_info(sdata, "authenticated\n");
2646 ifmgd->auth_data->done = true;
2647 ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2648 ifmgd->auth_data->timeout_started = true;
2649 run_again(sdata, ifmgd->auth_data->timeout);
2650
2651 if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2652 ifmgd->auth_data->expected_transaction != 2) {
2653 /*
2654 * Report auth frame to user space for processing since another
2655 * round of Authentication frames is still needed.
2656 */
2657 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2658 return;
2659 }
2660
2661 /* move station state to auth */
2662 mutex_lock(&sdata->local->sta_mtx);
2663 sta = sta_info_get(sdata, bssid);
2664 if (!sta) {
2665 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2666 goto out_err;
2667 }
2668 if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2669 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2670 goto out_err;
2671 }
2672 mutex_unlock(&sdata->local->sta_mtx);
2673
2674 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2675 return;
2676 out_err:
2677 mutex_unlock(&sdata->local->sta_mtx);
2678 /* ignore frame -- wait for timeout */
2679 }
2680
2681 #define case_WLAN(type) \
2682 case WLAN_REASON_##type: return #type
2683
2684 static const char *ieee80211_get_reason_code_string(u16 reason_code)
2685 {
2686 switch (reason_code) {
2687 case_WLAN(UNSPECIFIED);
2688 case_WLAN(PREV_AUTH_NOT_VALID);
2689 case_WLAN(DEAUTH_LEAVING);
2690 case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2691 case_WLAN(DISASSOC_AP_BUSY);
2692 case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2693 case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2694 case_WLAN(DISASSOC_STA_HAS_LEFT);
2695 case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2696 case_WLAN(DISASSOC_BAD_POWER);
2697 case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2698 case_WLAN(INVALID_IE);
2699 case_WLAN(MIC_FAILURE);
2700 case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2701 case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2702 case_WLAN(IE_DIFFERENT);
2703 case_WLAN(INVALID_GROUP_CIPHER);
2704 case_WLAN(INVALID_PAIRWISE_CIPHER);
2705 case_WLAN(INVALID_AKMP);
2706 case_WLAN(UNSUPP_RSN_VERSION);
2707 case_WLAN(INVALID_RSN_IE_CAP);
2708 case_WLAN(IEEE8021X_FAILED);
2709 case_WLAN(CIPHER_SUITE_REJECTED);
2710 case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2711 case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2712 case_WLAN(DISASSOC_LOW_ACK);
2713 case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2714 case_WLAN(QSTA_LEAVE_QBSS);
2715 case_WLAN(QSTA_NOT_USE);
2716 case_WLAN(QSTA_REQUIRE_SETUP);
2717 case_WLAN(QSTA_TIMEOUT);
2718 case_WLAN(QSTA_CIPHER_NOT_SUPP);
2719 case_WLAN(MESH_PEER_CANCELED);
2720 case_WLAN(MESH_MAX_PEERS);
2721 case_WLAN(MESH_CONFIG);
2722 case_WLAN(MESH_CLOSE);
2723 case_WLAN(MESH_MAX_RETRIES);
2724 case_WLAN(MESH_CONFIRM_TIMEOUT);
2725 case_WLAN(MESH_INVALID_GTK);
2726 case_WLAN(MESH_INCONSISTENT_PARAM);
2727 case_WLAN(MESH_INVALID_SECURITY);
2728 case_WLAN(MESH_PATH_ERROR);
2729 case_WLAN(MESH_PATH_NOFORWARD);
2730 case_WLAN(MESH_PATH_DEST_UNREACHABLE);
2731 case_WLAN(MAC_EXISTS_IN_MBSS);
2732 case_WLAN(MESH_CHAN_REGULATORY);
2733 case_WLAN(MESH_CHAN);
2734 default: return "<unknown>";
2735 }
2736 }
2737
2738 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2739 struct ieee80211_mgmt *mgmt, size_t len)
2740 {
2741 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2742 u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2743
2744 sdata_assert_lock(sdata);
2745
2746 if (len < 24 + 2)
2747 return;
2748
2749 if (ifmgd->associated &&
2750 ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) {
2751 const u8 *bssid = ifmgd->associated->bssid;
2752
2753 sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
2754 bssid, reason_code,
2755 ieee80211_get_reason_code_string(reason_code));
2756
2757 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2758
2759 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false,
2760 reason_code);
2761 return;
2762 }
2763
2764 if (ifmgd->assoc_data &&
2765 ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2766 const u8 *bssid = ifmgd->assoc_data->bss->bssid;
2767
2768 sdata_info(sdata,
2769 "deauthenticated from %pM while associating (Reason: %u=%s)\n",
2770 bssid, reason_code,
2771 ieee80211_get_reason_code_string(reason_code));
2772
2773 ieee80211_destroy_assoc_data(sdata, false);
2774
2775 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2776 return;
2777 }
2778 }
2779
2780
2781 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2782 struct ieee80211_mgmt *mgmt, size_t len)
2783 {
2784 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2785 u16 reason_code;
2786
2787 sdata_assert_lock(sdata);
2788
2789 if (len < 24 + 2)
2790 return;
2791
2792 if (!ifmgd->associated ||
2793 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2794 return;
2795
2796 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2797
2798 sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2799 mgmt->sa, reason_code);
2800
2801 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2802
2803 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code);
2804 }
2805
2806 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2807 u8 *supp_rates, unsigned int supp_rates_len,
2808 u32 *rates, u32 *basic_rates,
2809 bool *have_higher_than_11mbit,
2810 int *min_rate, int *min_rate_index,
2811 int shift, u32 rate_flags)
2812 {
2813 int i, j;
2814
2815 for (i = 0; i < supp_rates_len; i++) {
2816 int rate = supp_rates[i] & 0x7f;
2817 bool is_basic = !!(supp_rates[i] & 0x80);
2818
2819 if ((rate * 5 * (1 << shift)) > 110)
2820 *have_higher_than_11mbit = true;
2821
2822 /*
2823 * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2824 * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2825 *
2826 * Note: Even through the membership selector and the basic
2827 * rate flag share the same bit, they are not exactly
2828 * the same.
2829 */
2830 if (!!(supp_rates[i] & 0x80) &&
2831 (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2832 continue;
2833
2834 for (j = 0; j < sband->n_bitrates; j++) {
2835 struct ieee80211_rate *br;
2836 int brate;
2837
2838 br = &sband->bitrates[j];
2839 if ((rate_flags & br->flags) != rate_flags)
2840 continue;
2841
2842 brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2843 if (brate == rate) {
2844 *rates |= BIT(j);
2845 if (is_basic)
2846 *basic_rates |= BIT(j);
2847 if ((rate * 5) < *min_rate) {
2848 *min_rate = rate * 5;
2849 *min_rate_index = j;
2850 }
2851 break;
2852 }
2853 }
2854 }
2855 }
2856
2857 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2858 struct cfg80211_bss *cbss,
2859 struct ieee80211_mgmt *mgmt, size_t len)
2860 {
2861 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2862 struct ieee80211_local *local = sdata->local;
2863 struct ieee80211_supported_band *sband;
2864 struct sta_info *sta;
2865 u8 *pos;
2866 u16 capab_info, aid;
2867 struct ieee802_11_elems elems;
2868 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2869 const struct cfg80211_bss_ies *bss_ies = NULL;
2870 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2871 u32 changed = 0;
2872 int err;
2873 bool ret;
2874
2875 /* AssocResp and ReassocResp have identical structure */
2876
2877 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2878 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2879
2880 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2881 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2882 aid);
2883 aid &= ~(BIT(15) | BIT(14));
2884
2885 ifmgd->broken_ap = false;
2886
2887 if (aid == 0 || aid > IEEE80211_MAX_AID) {
2888 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2889 aid);
2890 aid = 0;
2891 ifmgd->broken_ap = true;
2892 }
2893
2894 pos = mgmt->u.assoc_resp.variable;
2895 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2896
2897 if (!elems.supp_rates) {
2898 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2899 return false;
2900 }
2901
2902 ifmgd->aid = aid;
2903 ifmgd->tdls_chan_switch_prohibited =
2904 elems.ext_capab && elems.ext_capab_len >= 5 &&
2905 (elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
2906
2907 /*
2908 * Some APs are erroneously not including some information in their
2909 * (re)association response frames. Try to recover by using the data
2910 * from the beacon or probe response. This seems to afflict mobile
2911 * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2912 * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2913 */
2914 if ((assoc_data->wmm && !elems.wmm_param) ||
2915 (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2916 (!elems.ht_cap_elem || !elems.ht_operation)) ||
2917 (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2918 (!elems.vht_cap_elem || !elems.vht_operation))) {
2919 const struct cfg80211_bss_ies *ies;
2920 struct ieee802_11_elems bss_elems;
2921
2922 rcu_read_lock();
2923 ies = rcu_dereference(cbss->ies);
2924 if (ies)
2925 bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2926 GFP_ATOMIC);
2927 rcu_read_unlock();
2928 if (!bss_ies)
2929 return false;
2930
2931 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2932 false, &bss_elems);
2933 if (assoc_data->wmm &&
2934 !elems.wmm_param && bss_elems.wmm_param) {
2935 elems.wmm_param = bss_elems.wmm_param;
2936 sdata_info(sdata,
2937 "AP bug: WMM param missing from AssocResp\n");
2938 }
2939
2940 /*
2941 * Also check if we requested HT/VHT, otherwise the AP doesn't
2942 * have to include the IEs in the (re)association response.
2943 */
2944 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2945 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2946 elems.ht_cap_elem = bss_elems.ht_cap_elem;
2947 sdata_info(sdata,
2948 "AP bug: HT capability missing from AssocResp\n");
2949 }
2950 if (!elems.ht_operation && bss_elems.ht_operation &&
2951 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2952 elems.ht_operation = bss_elems.ht_operation;
2953 sdata_info(sdata,
2954 "AP bug: HT operation missing from AssocResp\n");
2955 }
2956 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2957 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2958 elems.vht_cap_elem = bss_elems.vht_cap_elem;
2959 sdata_info(sdata,
2960 "AP bug: VHT capa missing from AssocResp\n");
2961 }
2962 if (!elems.vht_operation && bss_elems.vht_operation &&
2963 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2964 elems.vht_operation = bss_elems.vht_operation;
2965 sdata_info(sdata,
2966 "AP bug: VHT operation missing from AssocResp\n");
2967 }
2968 }
2969
2970 /*
2971 * We previously checked these in the beacon/probe response, so
2972 * they should be present here. This is just a safety net.
2973 */
2974 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2975 (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2976 sdata_info(sdata,
2977 "HT AP is missing WMM params or HT capability/operation\n");
2978 ret = false;
2979 goto out;
2980 }
2981
2982 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2983 (!elems.vht_cap_elem || !elems.vht_operation)) {
2984 sdata_info(sdata,
2985 "VHT AP is missing VHT capability/operation\n");
2986 ret = false;
2987 goto out;
2988 }
2989
2990 mutex_lock(&sdata->local->sta_mtx);
2991 /*
2992 * station info was already allocated and inserted before
2993 * the association and should be available to us
2994 */
2995 sta = sta_info_get(sdata, cbss->bssid);
2996 if (WARN_ON(!sta)) {
2997 mutex_unlock(&sdata->local->sta_mtx);
2998 ret = false;
2999 goto out;
3000 }
3001
3002 sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
3003
3004 /* Set up internal HT/VHT capabilities */
3005 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
3006 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
3007 elems.ht_cap_elem, sta);
3008
3009 if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
3010 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
3011 elems.vht_cap_elem, sta);
3012
3013 /*
3014 * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
3015 * in their association response, so ignore that data for our own
3016 * configuration. If it changed since the last beacon, we'll get the
3017 * next beacon and update then.
3018 */
3019
3020 /*
3021 * If an operating mode notification IE is present, override the
3022 * NSS calculation (that would be done in rate_control_rate_init())
3023 * and use the # of streams from that element.
3024 */
3025 if (elems.opmode_notif &&
3026 !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
3027 u8 nss;
3028
3029 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
3030 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
3031 nss += 1;
3032 sta->sta.rx_nss = nss;
3033 }
3034
3035 rate_control_rate_init(sta);
3036
3037 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) {
3038 set_sta_flag(sta, WLAN_STA_MFP);
3039 sta->sta.mfp = true;
3040 } else {
3041 sta->sta.mfp = false;
3042 }
3043
3044 sta->sta.wme = elems.wmm_param && local->hw.queues >= IEEE80211_NUM_ACS;
3045
3046 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
3047 if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
3048 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
3049 if (err) {
3050 sdata_info(sdata,
3051 "failed to move station %pM to desired state\n",
3052 sta->sta.addr);
3053 WARN_ON(__sta_info_destroy(sta));
3054 mutex_unlock(&sdata->local->sta_mtx);
3055 ret = false;
3056 goto out;
3057 }
3058
3059 mutex_unlock(&sdata->local->sta_mtx);
3060
3061 /*
3062 * Always handle WMM once after association regardless
3063 * of the first value the AP uses. Setting -1 here has
3064 * that effect because the AP values is an unsigned
3065 * 4-bit value.
3066 */
3067 ifmgd->wmm_last_param_set = -1;
3068
3069 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && elems.wmm_param)
3070 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3071 elems.wmm_param_len);
3072 else
3073 ieee80211_set_wmm_default(sdata, false);
3074 changed |= BSS_CHANGED_QOS;
3075
3076 /* set AID and assoc capability,
3077 * ieee80211_set_associated() will tell the driver */
3078 bss_conf->aid = aid;
3079 bss_conf->assoc_capability = capab_info;
3080 ieee80211_set_associated(sdata, cbss, changed);
3081
3082 /*
3083 * If we're using 4-addr mode, let the AP know that we're
3084 * doing so, so that it can create the STA VLAN on its side
3085 */
3086 if (ifmgd->use_4addr)
3087 ieee80211_send_4addr_nullfunc(local, sdata);
3088
3089 /*
3090 * Start timer to probe the connection to the AP now.
3091 * Also start the timer that will detect beacon loss.
3092 */
3093 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
3094 ieee80211_sta_reset_beacon_monitor(sdata);
3095
3096 ret = true;
3097 out:
3098 kfree(bss_ies);
3099 return ret;
3100 }
3101
3102 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
3103 struct ieee80211_mgmt *mgmt,
3104 size_t len)
3105 {
3106 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3107 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
3108 u16 capab_info, status_code, aid;
3109 struct ieee802_11_elems elems;
3110 int ac, uapsd_queues = -1;
3111 u8 *pos;
3112 bool reassoc;
3113 struct cfg80211_bss *bss;
3114 struct ieee80211_event event = {
3115 .type = MLME_EVENT,
3116 .u.mlme.data = ASSOC_EVENT,
3117 };
3118
3119 sdata_assert_lock(sdata);
3120
3121 if (!assoc_data)
3122 return;
3123 if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3124 return;
3125
3126 /*
3127 * AssocResp and ReassocResp have identical structure, so process both
3128 * of them in this function.
3129 */
3130
3131 if (len < 24 + 6)
3132 return;
3133
3134 reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
3135 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
3136 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
3137 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
3138
3139 sdata_info(sdata,
3140 "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
3141 reassoc ? "Rea" : "A", mgmt->sa,
3142 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
3143
3144 pos = mgmt->u.assoc_resp.variable;
3145 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
3146
3147 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3148 elems.timeout_int &&
3149 elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
3150 u32 tu, ms;
3151 tu = le32_to_cpu(elems.timeout_int->value);
3152 ms = tu * 1024 / 1000;
3153 sdata_info(sdata,
3154 "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
3155 mgmt->sa, tu, ms);
3156 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3157 assoc_data->timeout_started = true;
3158 if (ms > IEEE80211_ASSOC_TIMEOUT)
3159 run_again(sdata, assoc_data->timeout);
3160 return;
3161 }
3162
3163 bss = assoc_data->bss;
3164
3165 if (status_code != WLAN_STATUS_SUCCESS) {
3166 sdata_info(sdata, "%pM denied association (code=%d)\n",
3167 mgmt->sa, status_code);
3168 ieee80211_destroy_assoc_data(sdata, false);
3169 event.u.mlme.status = MLME_DENIED;
3170 event.u.mlme.reason = status_code;
3171 drv_event_callback(sdata->local, sdata, &event);
3172 } else {
3173 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
3174 /* oops -- internal error -- send timeout for now */
3175 ieee80211_destroy_assoc_data(sdata, false);
3176 cfg80211_assoc_timeout(sdata->dev, bss);
3177 return;
3178 }
3179 event.u.mlme.status = MLME_SUCCESS;
3180 drv_event_callback(sdata->local, sdata, &event);
3181 sdata_info(sdata, "associated\n");
3182
3183 /*
3184 * destroy assoc_data afterwards, as otherwise an idle
3185 * recalc after assoc_data is NULL but before associated
3186 * is set can cause the interface to go idle
3187 */
3188 ieee80211_destroy_assoc_data(sdata, true);
3189
3190 /* get uapsd queues configuration */
3191 uapsd_queues = 0;
3192 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
3193 if (sdata->tx_conf[ac].uapsd)
3194 uapsd_queues |= BIT(ac);
3195 }
3196
3197 cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
3198 }
3199
3200 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
3201 struct ieee80211_mgmt *mgmt, size_t len,
3202 struct ieee80211_rx_status *rx_status,
3203 struct ieee802_11_elems *elems)
3204 {
3205 struct ieee80211_local *local = sdata->local;
3206 struct ieee80211_bss *bss;
3207 struct ieee80211_channel *channel;
3208
3209 sdata_assert_lock(sdata);
3210
3211 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
3212 if (!channel)
3213 return;
3214
3215 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3216 channel);
3217 if (bss) {
3218 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3219 ieee80211_rx_bss_put(local, bss);
3220 }
3221 }
3222
3223
3224 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
3225 struct sk_buff *skb)
3226 {
3227 struct ieee80211_mgmt *mgmt = (void *)skb->data;
3228 struct ieee80211_if_managed *ifmgd;
3229 struct ieee80211_rx_status *rx_status = (void *) skb->cb;
3230 size_t baselen, len = skb->len;
3231 struct ieee802_11_elems elems;
3232
3233 ifmgd = &sdata->u.mgd;
3234
3235 sdata_assert_lock(sdata);
3236
3237 if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3238 return; /* ignore ProbeResp to foreign address */
3239
3240 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
3241 if (baselen > len)
3242 return;
3243
3244 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3245 false, &elems);
3246
3247 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3248
3249 if (ifmgd->associated &&
3250 ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3251 ieee80211_reset_ap_probe(sdata);
3252
3253 if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
3254 ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
3255 /* got probe response, continue with auth */
3256 sdata_info(sdata, "direct probe responded\n");
3257 ifmgd->auth_data->tries = 0;
3258 ifmgd->auth_data->timeout = jiffies;
3259 ifmgd->auth_data->timeout_started = true;
3260 run_again(sdata, ifmgd->auth_data->timeout);
3261 }
3262 }
3263
3264 /*
3265 * This is the canonical list of information elements we care about,
3266 * the filter code also gives us all changes to the Microsoft OUI
3267 * (00:50:F2) vendor IE which is used for WMM which we need to track,
3268 * as well as the DTPC IE (part of the Cisco OUI) used for signaling
3269 * changes to requested client power.
3270 *
3271 * We implement beacon filtering in software since that means we can
3272 * avoid processing the frame here and in cfg80211, and userspace
3273 * will not be able to tell whether the hardware supports it or not.
3274 *
3275 * XXX: This list needs to be dynamic -- userspace needs to be able to
3276 * add items it requires. It also needs to be able to tell us to
3277 * look out for other vendor IEs.
3278 */
3279 static const u64 care_about_ies =
3280 (1ULL << WLAN_EID_COUNTRY) |
3281 (1ULL << WLAN_EID_ERP_INFO) |
3282 (1ULL << WLAN_EID_CHANNEL_SWITCH) |
3283 (1ULL << WLAN_EID_PWR_CONSTRAINT) |
3284 (1ULL << WLAN_EID_HT_CAPABILITY) |
3285 (1ULL << WLAN_EID_HT_OPERATION) |
3286 (1ULL << WLAN_EID_EXT_CHANSWITCH_ANN);
3287
3288 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
3289 struct ieee80211_mgmt *mgmt, size_t len,
3290 struct ieee80211_rx_status *rx_status)
3291 {
3292 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3293 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3294 size_t baselen;
3295 struct ieee802_11_elems elems;
3296 struct ieee80211_local *local = sdata->local;
3297 struct ieee80211_chanctx_conf *chanctx_conf;
3298 struct ieee80211_channel *chan;
3299 struct sta_info *sta;
3300 u32 changed = 0;
3301 bool erp_valid;
3302 u8 erp_value = 0;
3303 u32 ncrc;
3304 u8 *bssid;
3305 u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3306
3307 sdata_assert_lock(sdata);
3308
3309 /* Process beacon from the current BSS */
3310 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
3311 if (baselen > len)
3312 return;
3313
3314 rcu_read_lock();
3315 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3316 if (!chanctx_conf) {
3317 rcu_read_unlock();
3318 return;
3319 }
3320
3321 if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
3322 rcu_read_unlock();
3323 return;
3324 }
3325 chan = chanctx_conf->def.chan;
3326 rcu_read_unlock();
3327
3328 if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3329 ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
3330 ieee802_11_parse_elems(mgmt->u.beacon.variable,
3331 len - baselen, false, &elems);
3332
3333 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3334 if (elems.tim && !elems.parse_error) {
3335 const struct ieee80211_tim_ie *tim_ie = elems.tim;
3336 ifmgd->dtim_period = tim_ie->dtim_period;
3337 }
3338 ifmgd->have_beacon = true;
3339 ifmgd->assoc_data->need_beacon = false;
3340 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3341 sdata->vif.bss_conf.sync_tsf =
3342 le64_to_cpu(mgmt->u.beacon.timestamp);
3343 sdata->vif.bss_conf.sync_device_ts =
3344 rx_status->device_timestamp;
3345 if (elems.tim)
3346 sdata->vif.bss_conf.sync_dtim_count =
3347 elems.tim->dtim_count;
3348 else
3349 sdata->vif.bss_conf.sync_dtim_count = 0;
3350 }
3351 /* continue assoc process */
3352 ifmgd->assoc_data->timeout = jiffies;
3353 ifmgd->assoc_data->timeout_started = true;
3354 run_again(sdata, ifmgd->assoc_data->timeout);
3355 return;
3356 }
3357
3358 if (!ifmgd->associated ||
3359 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3360 return;
3361 bssid = ifmgd->associated->bssid;
3362
3363 /* Track average RSSI from the Beacon frames of the current AP */
3364 ifmgd->last_beacon_signal = rx_status->signal;
3365 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
3366 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3367 ifmgd->ave_beacon_signal = rx_status->signal * 16;
3368 ifmgd->last_cqm_event_signal = 0;
3369 ifmgd->count_beacon_signal = 1;
3370 ifmgd->last_ave_beacon_signal = 0;
3371 } else {
3372 ifmgd->ave_beacon_signal =
3373 (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
3374 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
3375 ifmgd->ave_beacon_signal) / 16;
3376 ifmgd->count_beacon_signal++;
3377 }
3378
3379 if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3380 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3381 int sig = ifmgd->ave_beacon_signal;
3382 int last_sig = ifmgd->last_ave_beacon_signal;
3383 struct ieee80211_event event = {
3384 .type = RSSI_EVENT,
3385 };
3386
3387 /*
3388 * if signal crosses either of the boundaries, invoke callback
3389 * with appropriate parameters
3390 */
3391 if (sig > ifmgd->rssi_max_thold &&
3392 (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3393 ifmgd->last_ave_beacon_signal = sig;
3394 event.u.rssi.data = RSSI_EVENT_HIGH;
3395 drv_event_callback(local, sdata, &event);
3396 } else if (sig < ifmgd->rssi_min_thold &&
3397 (last_sig >= ifmgd->rssi_max_thold ||
3398 last_sig == 0)) {
3399 ifmgd->last_ave_beacon_signal = sig;
3400 event.u.rssi.data = RSSI_EVENT_LOW;
3401 drv_event_callback(local, sdata, &event);
3402 }
3403 }
3404
3405 if (bss_conf->cqm_rssi_thold &&
3406 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3407 !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3408 int sig = ifmgd->ave_beacon_signal / 16;
3409 int last_event = ifmgd->last_cqm_event_signal;
3410 int thold = bss_conf->cqm_rssi_thold;
3411 int hyst = bss_conf->cqm_rssi_hyst;
3412 if (sig < thold &&
3413 (last_event == 0 || sig < last_event - hyst)) {
3414 ifmgd->last_cqm_event_signal = sig;
3415 ieee80211_cqm_rssi_notify(
3416 &sdata->vif,
3417 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3418 GFP_KERNEL);
3419 } else if (sig > thold &&
3420 (last_event == 0 || sig > last_event + hyst)) {
3421 ifmgd->last_cqm_event_signal = sig;
3422 ieee80211_cqm_rssi_notify(
3423 &sdata->vif,
3424 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3425 GFP_KERNEL);
3426 }
3427 }
3428
3429 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3430 mlme_dbg_ratelimited(sdata,
3431 "cancelling AP probe due to a received beacon\n");
3432 ieee80211_reset_ap_probe(sdata);
3433 }
3434
3435 /*
3436 * Push the beacon loss detection into the future since
3437 * we are processing a beacon from the AP just now.
3438 */
3439 ieee80211_sta_reset_beacon_monitor(sdata);
3440
3441 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3442 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3443 len - baselen, false, &elems,
3444 care_about_ies, ncrc);
3445
3446 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) {
3447 bool directed_tim = ieee80211_check_tim(elems.tim,
3448 elems.tim_len,
3449 ifmgd->aid);
3450 if (directed_tim) {
3451 if (local->hw.conf.dynamic_ps_timeout > 0) {
3452 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3453 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3454 ieee80211_hw_config(local,
3455 IEEE80211_CONF_CHANGE_PS);
3456 }
3457 ieee80211_send_nullfunc(local, sdata, 0);
3458 } else if (!local->pspolling && sdata->u.mgd.powersave) {
3459 local->pspolling = true;
3460
3461 /*
3462 * Here is assumed that the driver will be
3463 * able to send ps-poll frame and receive a
3464 * response even though power save mode is
3465 * enabled, but some drivers might require
3466 * to disable power save here. This needs
3467 * to be investigated.
3468 */
3469 ieee80211_send_pspoll(local, sdata);
3470 }
3471 }
3472 }
3473
3474 if (sdata->vif.p2p) {
3475 struct ieee80211_p2p_noa_attr noa = {};
3476 int ret;
3477
3478 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3479 len - baselen,
3480 IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3481 (u8 *) &noa, sizeof(noa));
3482 if (ret >= 2) {
3483 if (sdata->u.mgd.p2p_noa_index != noa.index) {
3484 /* valid noa_attr and index changed */
3485 sdata->u.mgd.p2p_noa_index = noa.index;
3486 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3487 changed |= BSS_CHANGED_P2P_PS;
3488 /*
3489 * make sure we update all information, the CRC
3490 * mechanism doesn't look at P2P attributes.
3491 */
3492 ifmgd->beacon_crc_valid = false;
3493 }
3494 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3495 /* noa_attr not found and we had valid noa_attr before */
3496 sdata->u.mgd.p2p_noa_index = -1;
3497 memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3498 changed |= BSS_CHANGED_P2P_PS;
3499 ifmgd->beacon_crc_valid = false;
3500 }
3501 }
3502
3503 if (ifmgd->csa_waiting_bcn)
3504 ieee80211_chswitch_post_beacon(sdata);
3505
3506 /*
3507 * Update beacon timing and dtim count on every beacon appearance. This
3508 * will allow the driver to use the most updated values. Do it before
3509 * comparing this one with last received beacon.
3510 * IMPORTANT: These parameters would possibly be out of sync by the time
3511 * the driver will use them. The synchronized view is currently
3512 * guaranteed only in certain callbacks.
3513 */
3514 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3515 sdata->vif.bss_conf.sync_tsf =
3516 le64_to_cpu(mgmt->u.beacon.timestamp);
3517 sdata->vif.bss_conf.sync_device_ts =
3518 rx_status->device_timestamp;
3519 if (elems.tim)
3520 sdata->vif.bss_conf.sync_dtim_count =
3521 elems.tim->dtim_count;
3522 else
3523 sdata->vif.bss_conf.sync_dtim_count = 0;
3524 }
3525
3526 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3527 return;
3528 ifmgd->beacon_crc = ncrc;
3529 ifmgd->beacon_crc_valid = true;
3530
3531 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3532
3533 ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3534 rx_status->device_timestamp,
3535 &elems, true);
3536
3537 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3538 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3539 elems.wmm_param_len))
3540 changed |= BSS_CHANGED_QOS;
3541
3542 /*
3543 * If we haven't had a beacon before, tell the driver about the
3544 * DTIM period (and beacon timing if desired) now.
3545 */
3546 if (!ifmgd->have_beacon) {
3547 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3548 if (elems.tim)
3549 bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3550 else
3551 bss_conf->dtim_period = 1;
3552
3553 changed |= BSS_CHANGED_BEACON_INFO;
3554 ifmgd->have_beacon = true;
3555
3556 mutex_lock(&local->iflist_mtx);
3557 ieee80211_recalc_ps(local, -1);
3558 mutex_unlock(&local->iflist_mtx);
3559
3560 ieee80211_recalc_ps_vif(sdata);
3561 }
3562
3563 if (elems.erp_info) {
3564 erp_valid = true;
3565 erp_value = elems.erp_info[0];
3566 } else {
3567 erp_valid = false;
3568 }
3569 changed |= ieee80211_handle_bss_capability(sdata,
3570 le16_to_cpu(mgmt->u.beacon.capab_info),
3571 erp_valid, erp_value);
3572
3573 mutex_lock(&local->sta_mtx);
3574 sta = sta_info_get(sdata, bssid);
3575
3576 if (ieee80211_config_bw(sdata, sta,
3577 elems.ht_cap_elem, elems.ht_operation,
3578 elems.vht_operation, bssid, &changed)) {
3579 mutex_unlock(&local->sta_mtx);
3580 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3581 WLAN_REASON_DEAUTH_LEAVING,
3582 true, deauth_buf);
3583 ieee80211_report_disconnect(sdata, deauth_buf,
3584 sizeof(deauth_buf), true,
3585 WLAN_REASON_DEAUTH_LEAVING);
3586 return;
3587 }
3588
3589 if (sta && elems.opmode_notif)
3590 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3591 rx_status->band, true);
3592 mutex_unlock(&local->sta_mtx);
3593
3594 changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
3595 elems.country_elem,
3596 elems.country_elem_len,
3597 elems.pwr_constr_elem,
3598 elems.cisco_dtpc_elem);
3599
3600 ieee80211_bss_info_change_notify(sdata, changed);
3601 }
3602
3603 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3604 struct sk_buff *skb)
3605 {
3606 struct ieee80211_rx_status *rx_status;
3607 struct ieee80211_mgmt *mgmt;
3608 u16 fc;
3609 struct ieee802_11_elems elems;
3610 int ies_len;
3611
3612 rx_status = (struct ieee80211_rx_status *) skb->cb;
3613 mgmt = (struct ieee80211_mgmt *) skb->data;
3614 fc = le16_to_cpu(mgmt->frame_control);
3615
3616 sdata_lock(sdata);
3617
3618 switch (fc & IEEE80211_FCTL_STYPE) {
3619 case IEEE80211_STYPE_BEACON:
3620 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3621 break;
3622 case IEEE80211_STYPE_PROBE_RESP:
3623 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3624 break;
3625 case IEEE80211_STYPE_AUTH:
3626 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3627 break;
3628 case IEEE80211_STYPE_DEAUTH:
3629 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3630 break;
3631 case IEEE80211_STYPE_DISASSOC:
3632 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3633 break;
3634 case IEEE80211_STYPE_ASSOC_RESP:
3635 case IEEE80211_STYPE_REASSOC_RESP:
3636 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3637 break;
3638 case IEEE80211_STYPE_ACTION:
3639 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3640 ies_len = skb->len -
3641 offsetof(struct ieee80211_mgmt,
3642 u.action.u.chan_switch.variable);
3643
3644 if (ies_len < 0)
3645 break;
3646
3647 ieee802_11_parse_elems(
3648 mgmt->u.action.u.chan_switch.variable,
3649 ies_len, true, &elems);
3650
3651 if (elems.parse_error)
3652 break;
3653
3654 ieee80211_sta_process_chanswitch(sdata,
3655 rx_status->mactime,
3656 rx_status->device_timestamp,
3657 &elems, false);
3658 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3659 ies_len = skb->len -
3660 offsetof(struct ieee80211_mgmt,
3661 u.action.u.ext_chan_switch.variable);
3662
3663 if (ies_len < 0)
3664 break;
3665
3666 ieee802_11_parse_elems(
3667 mgmt->u.action.u.ext_chan_switch.variable,
3668 ies_len, true, &elems);
3669
3670 if (elems.parse_error)
3671 break;
3672
3673 /* for the handling code pretend this was also an IE */
3674 elems.ext_chansw_ie =
3675 &mgmt->u.action.u.ext_chan_switch.data;
3676
3677 ieee80211_sta_process_chanswitch(sdata,
3678 rx_status->mactime,
3679 rx_status->device_timestamp,
3680 &elems, false);
3681 }
3682 break;
3683 }
3684 sdata_unlock(sdata);
3685 }
3686
3687 static void ieee80211_sta_timer(unsigned long data)
3688 {
3689 struct ieee80211_sub_if_data *sdata =
3690 (struct ieee80211_sub_if_data *) data;
3691
3692 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3693 }
3694
3695 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3696 u8 *bssid, u8 reason, bool tx)
3697 {
3698 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3699
3700 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3701 tx, frame_buf);
3702
3703 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
3704 reason);
3705 }
3706
3707 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
3708 {
3709 struct ieee80211_local *local = sdata->local;
3710 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3711 struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3712 u32 tx_flags = 0;
3713
3714 sdata_assert_lock(sdata);
3715
3716 if (WARN_ON_ONCE(!auth_data))
3717 return -EINVAL;
3718
3719 auth_data->tries++;
3720
3721 if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3722 sdata_info(sdata, "authentication with %pM timed out\n",
3723 auth_data->bss->bssid);
3724
3725 /*
3726 * Most likely AP is not in the range so remove the
3727 * bss struct for that AP.
3728 */
3729 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3730
3731 return -ETIMEDOUT;
3732 }
3733
3734 drv_mgd_prepare_tx(local, sdata);
3735
3736 if (auth_data->bss->proberesp_ies) {
3737 u16 trans = 1;
3738 u16 status = 0;
3739
3740 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3741 auth_data->bss->bssid, auth_data->tries,
3742 IEEE80211_AUTH_MAX_TRIES);
3743
3744 auth_data->expected_transaction = 2;
3745
3746 if (auth_data->algorithm == WLAN_AUTH_SAE) {
3747 trans = auth_data->sae_trans;
3748 status = auth_data->sae_status;
3749 auth_data->expected_transaction = trans;
3750 }
3751
3752 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3753 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3754 IEEE80211_TX_INTFL_MLME_CONN_TX;
3755
3756 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3757 auth_data->data, auth_data->data_len,
3758 auth_data->bss->bssid,
3759 auth_data->bss->bssid, NULL, 0, 0,
3760 tx_flags);
3761 } else {
3762 const u8 *ssidie;
3763
3764 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
3765 auth_data->bss->bssid, auth_data->tries,
3766 IEEE80211_AUTH_MAX_TRIES);
3767
3768 rcu_read_lock();
3769 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
3770 if (!ssidie) {
3771 rcu_read_unlock();
3772 return -EINVAL;
3773 }
3774 /*
3775 * Direct probe is sent to broadcast address as some APs
3776 * will not answer to direct packet in unassociated state.
3777 */
3778 ieee80211_send_probe_req(sdata, sdata->vif.addr, NULL,
3779 ssidie + 2, ssidie[1],
3780 NULL, 0, (u32) -1, true, 0,
3781 auth_data->bss->channel, false);
3782 rcu_read_unlock();
3783 }
3784
3785 if (tx_flags == 0) {
3786 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3787 auth_data->timeout_started = true;
3788 run_again(sdata, auth_data->timeout);
3789 } else {
3790 auth_data->timeout =
3791 round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3792 auth_data->timeout_started = true;
3793 run_again(sdata, auth_data->timeout);
3794 }
3795
3796 return 0;
3797 }
3798
3799 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3800 {
3801 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3802 struct ieee80211_local *local = sdata->local;
3803
3804 sdata_assert_lock(sdata);
3805
3806 assoc_data->tries++;
3807 if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3808 sdata_info(sdata, "association with %pM timed out\n",
3809 assoc_data->bss->bssid);
3810
3811 /*
3812 * Most likely AP is not in the range so remove the
3813 * bss struct for that AP.
3814 */
3815 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3816
3817 return -ETIMEDOUT;
3818 }
3819
3820 sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3821 assoc_data->bss->bssid, assoc_data->tries,
3822 IEEE80211_ASSOC_MAX_TRIES);
3823 ieee80211_send_assoc(sdata);
3824
3825 if (!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3826 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3827 assoc_data->timeout_started = true;
3828 run_again(sdata, assoc_data->timeout);
3829 } else {
3830 assoc_data->timeout =
3831 round_jiffies_up(jiffies +
3832 IEEE80211_ASSOC_TIMEOUT_LONG);
3833 assoc_data->timeout_started = true;
3834 run_again(sdata, assoc_data->timeout);
3835 }
3836
3837 return 0;
3838 }
3839
3840 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3841 __le16 fc, bool acked)
3842 {
3843 struct ieee80211_local *local = sdata->local;
3844
3845 sdata->u.mgd.status_fc = fc;
3846 sdata->u.mgd.status_acked = acked;
3847 sdata->u.mgd.status_received = true;
3848
3849 ieee80211_queue_work(&local->hw, &sdata->work);
3850 }
3851
3852 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3853 {
3854 struct ieee80211_local *local = sdata->local;
3855 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3856
3857 sdata_lock(sdata);
3858
3859 if (ifmgd->status_received) {
3860 __le16 fc = ifmgd->status_fc;
3861 bool status_acked = ifmgd->status_acked;
3862
3863 ifmgd->status_received = false;
3864 if (ifmgd->auth_data &&
3865 (ieee80211_is_probe_req(fc) || ieee80211_is_auth(fc))) {
3866 if (status_acked) {
3867 ifmgd->auth_data->timeout =
3868 jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3869 run_again(sdata, ifmgd->auth_data->timeout);
3870 } else {
3871 ifmgd->auth_data->timeout = jiffies - 1;
3872 }
3873 ifmgd->auth_data->timeout_started = true;
3874 } else if (ifmgd->assoc_data &&
3875 (ieee80211_is_assoc_req(fc) ||
3876 ieee80211_is_reassoc_req(fc))) {
3877 if (status_acked) {
3878 ifmgd->assoc_data->timeout =
3879 jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3880 run_again(sdata, ifmgd->assoc_data->timeout);
3881 } else {
3882 ifmgd->assoc_data->timeout = jiffies - 1;
3883 }
3884 ifmgd->assoc_data->timeout_started = true;
3885 }
3886 }
3887
3888 if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3889 time_after(jiffies, ifmgd->auth_data->timeout)) {
3890 if (ifmgd->auth_data->done) {
3891 /*
3892 * ok ... we waited for assoc but userspace didn't,
3893 * so let's just kill the auth data
3894 */
3895 ieee80211_destroy_auth_data(sdata, false);
3896 } else if (ieee80211_probe_auth(sdata)) {
3897 u8 bssid[ETH_ALEN];
3898 struct ieee80211_event event = {
3899 .type = MLME_EVENT,
3900 .u.mlme.data = AUTH_EVENT,
3901 .u.mlme.status = MLME_TIMEOUT,
3902 };
3903
3904 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3905
3906 ieee80211_destroy_auth_data(sdata, false);
3907
3908 cfg80211_auth_timeout(sdata->dev, bssid);
3909 drv_event_callback(sdata->local, sdata, &event);
3910 }
3911 } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3912 run_again(sdata, ifmgd->auth_data->timeout);
3913
3914 if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3915 time_after(jiffies, ifmgd->assoc_data->timeout)) {
3916 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3917 ieee80211_do_assoc(sdata)) {
3918 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3919 struct ieee80211_event event = {
3920 .type = MLME_EVENT,
3921 .u.mlme.data = ASSOC_EVENT,
3922 .u.mlme.status = MLME_TIMEOUT,
3923 };
3924
3925 ieee80211_destroy_assoc_data(sdata, false);
3926 cfg80211_assoc_timeout(sdata->dev, bss);
3927 drv_event_callback(sdata->local, sdata, &event);
3928 }
3929 } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3930 run_again(sdata, ifmgd->assoc_data->timeout);
3931
3932 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3933 ifmgd->associated) {
3934 u8 bssid[ETH_ALEN];
3935 int max_tries;
3936
3937 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3938
3939 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3940 max_tries = max_nullfunc_tries;
3941 else
3942 max_tries = max_probe_tries;
3943
3944 /* ACK received for nullfunc probing frame */
3945 if (!ifmgd->probe_send_count)
3946 ieee80211_reset_ap_probe(sdata);
3947 else if (ifmgd->nullfunc_failed) {
3948 if (ifmgd->probe_send_count < max_tries) {
3949 mlme_dbg(sdata,
3950 "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3951 bssid, ifmgd->probe_send_count,
3952 max_tries);
3953 ieee80211_mgd_probe_ap_send(sdata);
3954 } else {
3955 mlme_dbg(sdata,
3956 "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3957 bssid);
3958 ieee80211_sta_connection_lost(sdata, bssid,
3959 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3960 false);
3961 }
3962 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3963 run_again(sdata, ifmgd->probe_timeout);
3964 else if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3965 mlme_dbg(sdata,
3966 "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3967 bssid, probe_wait_ms);
3968 ieee80211_sta_connection_lost(sdata, bssid,
3969 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3970 } else if (ifmgd->probe_send_count < max_tries) {
3971 mlme_dbg(sdata,
3972 "No probe response from AP %pM after %dms, try %d/%i\n",
3973 bssid, probe_wait_ms,
3974 ifmgd->probe_send_count, max_tries);
3975 ieee80211_mgd_probe_ap_send(sdata);
3976 } else {
3977 /*
3978 * We actually lost the connection ... or did we?
3979 * Let's make sure!
3980 */
3981 wiphy_debug(local->hw.wiphy,
3982 "%s: No probe response from AP %pM"
3983 " after %dms, disconnecting.\n",
3984 sdata->name,
3985 bssid, probe_wait_ms);
3986
3987 ieee80211_sta_connection_lost(sdata, bssid,
3988 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3989 }
3990 }
3991
3992 sdata_unlock(sdata);
3993 }
3994
3995 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3996 {
3997 struct ieee80211_sub_if_data *sdata =
3998 (struct ieee80211_sub_if_data *) data;
3999 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4000
4001 if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
4002 return;
4003
4004 sdata->u.mgd.connection_loss = false;
4005 ieee80211_queue_work(&sdata->local->hw,
4006 &sdata->u.mgd.beacon_connection_loss_work);
4007 }
4008
4009 static void ieee80211_sta_conn_mon_timer(unsigned long data)
4010 {
4011 struct ieee80211_sub_if_data *sdata =
4012 (struct ieee80211_sub_if_data *) data;
4013 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4014 struct ieee80211_local *local = sdata->local;
4015
4016 if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
4017 return;
4018
4019 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
4020 }
4021
4022 static void ieee80211_sta_monitor_work(struct work_struct *work)
4023 {
4024 struct ieee80211_sub_if_data *sdata =
4025 container_of(work, struct ieee80211_sub_if_data,
4026 u.mgd.monitor_work);
4027
4028 ieee80211_mgd_probe_ap(sdata, false);
4029 }
4030
4031 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
4032 {
4033 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
4034 __ieee80211_stop_poll(sdata);
4035
4036 /* let's probe the connection once */
4037 if (!ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
4038 ieee80211_queue_work(&sdata->local->hw,
4039 &sdata->u.mgd.monitor_work);
4040 /* and do all the other regular work too */
4041 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
4042 }
4043 }
4044
4045 #ifdef CONFIG_PM
4046 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
4047 {
4048 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4049 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4050
4051 sdata_lock(sdata);
4052
4053 if (ifmgd->auth_data || ifmgd->assoc_data) {
4054 const u8 *bssid = ifmgd->auth_data ?
4055 ifmgd->auth_data->bss->bssid :
4056 ifmgd->assoc_data->bss->bssid;
4057
4058 /*
4059 * If we are trying to authenticate / associate while suspending,
4060 * cfg80211 won't know and won't actually abort those attempts,
4061 * thus we need to do that ourselves.
4062 */
4063 ieee80211_send_deauth_disassoc(sdata, bssid,
4064 IEEE80211_STYPE_DEAUTH,
4065 WLAN_REASON_DEAUTH_LEAVING,
4066 false, frame_buf);
4067 if (ifmgd->assoc_data)
4068 ieee80211_destroy_assoc_data(sdata, false);
4069 if (ifmgd->auth_data)
4070 ieee80211_destroy_auth_data(sdata, false);
4071 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4072 IEEE80211_DEAUTH_FRAME_LEN);
4073 }
4074
4075 /* This is a bit of a hack - we should find a better and more generic
4076 * solution to this. Normally when suspending, cfg80211 will in fact
4077 * deauthenticate. However, it doesn't (and cannot) stop an ongoing
4078 * auth (not so important) or assoc (this is the problem) process.
4079 *
4080 * As a consequence, it can happen that we are in the process of both
4081 * associating and suspending, and receive an association response
4082 * after cfg80211 has checked if it needs to disconnect, but before
4083 * we actually set the flag to drop incoming frames. This will then
4084 * cause the workqueue flush to process the association response in
4085 * the suspend, resulting in a successful association just before it
4086 * tries to remove the interface from the driver, which now though
4087 * has a channel context assigned ... this results in issues.
4088 *
4089 * To work around this (for now) simply deauth here again if we're
4090 * now connected.
4091 */
4092 if (ifmgd->associated && !sdata->local->wowlan) {
4093 u8 bssid[ETH_ALEN];
4094 struct cfg80211_deauth_request req = {
4095 .reason_code = WLAN_REASON_DEAUTH_LEAVING,
4096 .bssid = bssid,
4097 };
4098
4099 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
4100 ieee80211_mgd_deauth(sdata, &req);
4101 }
4102
4103 sdata_unlock(sdata);
4104 }
4105
4106 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
4107 {
4108 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4109
4110 sdata_lock(sdata);
4111 if (!ifmgd->associated) {
4112 sdata_unlock(sdata);
4113 return;
4114 }
4115
4116 if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
4117 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
4118 mlme_dbg(sdata, "driver requested disconnect after resume\n");
4119 ieee80211_sta_connection_lost(sdata,
4120 ifmgd->associated->bssid,
4121 WLAN_REASON_UNSPECIFIED,
4122 true);
4123 sdata_unlock(sdata);
4124 return;
4125 }
4126 sdata_unlock(sdata);
4127 }
4128 #endif
4129
4130 /* interface setup */
4131 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
4132 {
4133 struct ieee80211_if_managed *ifmgd;
4134
4135 ifmgd = &sdata->u.mgd;
4136 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
4137 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
4138 INIT_WORK(&ifmgd->beacon_connection_loss_work,
4139 ieee80211_beacon_connection_loss_work);
4140 INIT_WORK(&ifmgd->csa_connection_drop_work,
4141 ieee80211_csa_connection_drop_work);
4142 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
4143 INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
4144 ieee80211_tdls_peer_del_work);
4145 setup_timer(&ifmgd->timer, ieee80211_sta_timer,
4146 (unsigned long) sdata);
4147 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
4148 (unsigned long) sdata);
4149 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
4150 (unsigned long) sdata);
4151 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
4152 (unsigned long) sdata);
4153 INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
4154 ieee80211_sta_handle_tspec_ac_params_wk);
4155
4156 ifmgd->flags = 0;
4157 ifmgd->powersave = sdata->wdev.ps;
4158 ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
4159 ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
4160 ifmgd->p2p_noa_index = -1;
4161
4162 if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4163 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
4164 else
4165 ifmgd->req_smps = IEEE80211_SMPS_OFF;
4166
4167 /* Setup TDLS data */
4168 spin_lock_init(&ifmgd->teardown_lock);
4169 ifmgd->teardown_skb = NULL;
4170 ifmgd->orig_teardown_skb = NULL;
4171 }
4172
4173 /* scan finished notification */
4174 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
4175 {
4176 struct ieee80211_sub_if_data *sdata;
4177
4178 /* Restart STA timers */
4179 rcu_read_lock();
4180 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4181 if (ieee80211_sdata_running(sdata))
4182 ieee80211_restart_sta_timer(sdata);
4183 }
4184 rcu_read_unlock();
4185 }
4186
4187 int ieee80211_max_network_latency(struct notifier_block *nb,
4188 unsigned long data, void *dummy)
4189 {
4190 s32 latency_usec = (s32) data;
4191 struct ieee80211_local *local =
4192 container_of(nb, struct ieee80211_local,
4193 network_latency_notifier);
4194
4195 mutex_lock(&local->iflist_mtx);
4196 ieee80211_recalc_ps(local, latency_usec);
4197 mutex_unlock(&local->iflist_mtx);
4198
4199 return NOTIFY_OK;
4200 }
4201
4202 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
4203 struct cfg80211_bss *cbss)
4204 {
4205 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4206 const u8 *ht_cap_ie, *vht_cap_ie;
4207 const struct ieee80211_ht_cap *ht_cap;
4208 const struct ieee80211_vht_cap *vht_cap;
4209 u8 chains = 1;
4210
4211 if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
4212 return chains;
4213
4214 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4215 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
4216 ht_cap = (void *)(ht_cap_ie + 2);
4217 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
4218 /*
4219 * TODO: use "Tx Maximum Number Spatial Streams Supported" and
4220 * "Tx Unequal Modulation Supported" fields.
4221 */
4222 }
4223
4224 if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
4225 return chains;
4226
4227 vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4228 if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
4229 u8 nss;
4230 u16 tx_mcs_map;
4231
4232 vht_cap = (void *)(vht_cap_ie + 2);
4233 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
4234 for (nss = 8; nss > 0; nss--) {
4235 if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
4236 IEEE80211_VHT_MCS_NOT_SUPPORTED)
4237 break;
4238 }
4239 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
4240 chains = max(chains, nss);
4241 }
4242
4243 return chains;
4244 }
4245
4246 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
4247 struct cfg80211_bss *cbss)
4248 {
4249 struct ieee80211_local *local = sdata->local;
4250 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4251 const struct ieee80211_ht_cap *ht_cap = NULL;
4252 const struct ieee80211_ht_operation *ht_oper = NULL;
4253 const struct ieee80211_vht_operation *vht_oper = NULL;
4254 struct ieee80211_supported_band *sband;
4255 struct cfg80211_chan_def chandef;
4256 int ret;
4257
4258 sband = local->hw.wiphy->bands[cbss->channel->band];
4259
4260 ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
4261 IEEE80211_STA_DISABLE_80P80MHZ |
4262 IEEE80211_STA_DISABLE_160MHZ);
4263
4264 rcu_read_lock();
4265
4266 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
4267 sband->ht_cap.ht_supported) {
4268 const u8 *ht_oper_ie, *ht_cap_ie;
4269
4270 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4271 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
4272 ht_oper = (void *)(ht_oper_ie + 2);
4273
4274 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4275 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
4276 ht_cap = (void *)(ht_cap_ie + 2);
4277
4278 if (!ht_cap) {
4279 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4280 ht_oper = NULL;
4281 }
4282 }
4283
4284 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4285 sband->vht_cap.vht_supported) {
4286 const u8 *vht_oper_ie, *vht_cap;
4287
4288 vht_oper_ie = ieee80211_bss_get_ie(cbss,
4289 WLAN_EID_VHT_OPERATION);
4290 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
4291 vht_oper = (void *)(vht_oper_ie + 2);
4292 if (vht_oper && !ht_oper) {
4293 vht_oper = NULL;
4294 sdata_info(sdata,
4295 "AP advertised VHT without HT, disabling both\n");
4296 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4297 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4298 }
4299
4300 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4301 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
4302 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4303 vht_oper = NULL;
4304 }
4305 }
4306
4307 ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
4308 cbss->channel,
4309 ht_cap, ht_oper, vht_oper,
4310 &chandef, false);
4311
4312 sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
4313 local->rx_chains);
4314
4315 rcu_read_unlock();
4316
4317 /* will change later if needed */
4318 sdata->smps_mode = IEEE80211_SMPS_OFF;
4319
4320 mutex_lock(&local->mtx);
4321 /*
4322 * If this fails (possibly due to channel context sharing
4323 * on incompatible channels, e.g. 80+80 and 160 sharing the
4324 * same control channel) try to use a smaller bandwidth.
4325 */
4326 ret = ieee80211_vif_use_channel(sdata, &chandef,
4327 IEEE80211_CHANCTX_SHARED);
4328
4329 /* don't downgrade for 5 and 10 MHz channels, though. */
4330 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
4331 chandef.width == NL80211_CHAN_WIDTH_10)
4332 goto out;
4333
4334 while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4335 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4336 ret = ieee80211_vif_use_channel(sdata, &chandef,
4337 IEEE80211_CHANCTX_SHARED);
4338 }
4339 out:
4340 mutex_unlock(&local->mtx);
4341 return ret;
4342 }
4343
4344 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4345 struct cfg80211_bss *cbss, bool assoc,
4346 bool override)
4347 {
4348 struct ieee80211_local *local = sdata->local;
4349 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4350 struct ieee80211_bss *bss = (void *)cbss->priv;
4351 struct sta_info *new_sta = NULL;
4352 struct ieee80211_supported_band *sband;
4353 bool have_sta = false;
4354 int err;
4355
4356 sband = local->hw.wiphy->bands[cbss->channel->band];
4357
4358 if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
4359 return -EINVAL;
4360
4361 if (assoc) {
4362 rcu_read_lock();
4363 have_sta = sta_info_get(sdata, cbss->bssid);
4364 rcu_read_unlock();
4365 }
4366
4367 if (!have_sta) {
4368 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
4369 if (!new_sta)
4370 return -ENOMEM;
4371 }
4372
4373 if (new_sta || override) {
4374 err = ieee80211_prep_channel(sdata, cbss);
4375 if (err) {
4376 if (new_sta)
4377 sta_info_free(local, new_sta);
4378 return -EINVAL;
4379 }
4380 }
4381
4382 if (new_sta) {
4383 u32 rates = 0, basic_rates = 0;
4384 bool have_higher_than_11mbit;
4385 int min_rate = INT_MAX, min_rate_index = -1;
4386 struct ieee80211_chanctx_conf *chanctx_conf;
4387 const struct cfg80211_bss_ies *ies;
4388 int shift = ieee80211_vif_get_shift(&sdata->vif);
4389 u32 rate_flags;
4390
4391 rcu_read_lock();
4392 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4393 if (WARN_ON(!chanctx_conf)) {
4394 rcu_read_unlock();
4395 sta_info_free(local, new_sta);
4396 return -EINVAL;
4397 }
4398 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
4399 rcu_read_unlock();
4400
4401 ieee80211_get_rates(sband, bss->supp_rates,
4402 bss->supp_rates_len,
4403 &rates, &basic_rates,
4404 &have_higher_than_11mbit,
4405 &min_rate, &min_rate_index,
4406 shift, rate_flags);
4407
4408 /*
4409 * This used to be a workaround for basic rates missing
4410 * in the association response frame. Now that we no
4411 * longer use the basic rates from there, it probably
4412 * doesn't happen any more, but keep the workaround so
4413 * in case some *other* APs are buggy in different ways
4414 * we can connect -- with a warning.
4415 */
4416 if (!basic_rates && min_rate_index >= 0) {
4417 sdata_info(sdata,
4418 "No basic rates, using min rate instead\n");
4419 basic_rates = BIT(min_rate_index);
4420 }
4421
4422 new_sta->sta.supp_rates[cbss->channel->band] = rates;
4423 sdata->vif.bss_conf.basic_rates = basic_rates;
4424
4425 /* cf. IEEE 802.11 9.2.12 */
4426 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
4427 have_higher_than_11mbit)
4428 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
4429 else
4430 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
4431
4432 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
4433
4434 /* set timing information */
4435 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
4436 rcu_read_lock();
4437 ies = rcu_dereference(cbss->beacon_ies);
4438 if (ies) {
4439 const u8 *tim_ie;
4440
4441 sdata->vif.bss_conf.sync_tsf = ies->tsf;
4442 sdata->vif.bss_conf.sync_device_ts =
4443 bss->device_ts_beacon;
4444 tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4445 ies->data, ies->len);
4446 if (tim_ie && tim_ie[1] >= 2)
4447 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
4448 else
4449 sdata->vif.bss_conf.sync_dtim_count = 0;
4450 } else if (!ieee80211_hw_check(&sdata->local->hw,
4451 TIMING_BEACON_ONLY)) {
4452 ies = rcu_dereference(cbss->proberesp_ies);
4453 /* must be non-NULL since beacon IEs were NULL */
4454 sdata->vif.bss_conf.sync_tsf = ies->tsf;
4455 sdata->vif.bss_conf.sync_device_ts =
4456 bss->device_ts_presp;
4457 sdata->vif.bss_conf.sync_dtim_count = 0;
4458 } else {
4459 sdata->vif.bss_conf.sync_tsf = 0;
4460 sdata->vif.bss_conf.sync_device_ts = 0;
4461 sdata->vif.bss_conf.sync_dtim_count = 0;
4462 }
4463 rcu_read_unlock();
4464
4465 /* tell driver about BSSID, basic rates and timing */
4466 ieee80211_bss_info_change_notify(sdata,
4467 BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4468 BSS_CHANGED_BEACON_INT);
4469
4470 if (assoc)
4471 sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4472
4473 err = sta_info_insert(new_sta);
4474 new_sta = NULL;
4475 if (err) {
4476 sdata_info(sdata,
4477 "failed to insert STA entry for the AP (error %d)\n",
4478 err);
4479 return err;
4480 }
4481 } else
4482 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4483
4484 /* Cancel scan to ensure that nothing interferes with connection */
4485 if (local->scanning)
4486 ieee80211_scan_cancel(local);
4487
4488 return 0;
4489 }
4490
4491 /* config hooks */
4492 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4493 struct cfg80211_auth_request *req)
4494 {
4495 struct ieee80211_local *local = sdata->local;
4496 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4497 struct ieee80211_mgd_auth_data *auth_data;
4498 u16 auth_alg;
4499 int err;
4500
4501 /* prepare auth data structure */
4502
4503 switch (req->auth_type) {
4504 case NL80211_AUTHTYPE_OPEN_SYSTEM:
4505 auth_alg = WLAN_AUTH_OPEN;
4506 break;
4507 case NL80211_AUTHTYPE_SHARED_KEY:
4508 if (IS_ERR(local->wep_tx_tfm))
4509 return -EOPNOTSUPP;
4510 auth_alg = WLAN_AUTH_SHARED_KEY;
4511 break;
4512 case NL80211_AUTHTYPE_FT:
4513 auth_alg = WLAN_AUTH_FT;
4514 break;
4515 case NL80211_AUTHTYPE_NETWORK_EAP:
4516 auth_alg = WLAN_AUTH_LEAP;
4517 break;
4518 case NL80211_AUTHTYPE_SAE:
4519 auth_alg = WLAN_AUTH_SAE;
4520 break;
4521 default:
4522 return -EOPNOTSUPP;
4523 }
4524
4525 auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
4526 req->ie_len, GFP_KERNEL);
4527 if (!auth_data)
4528 return -ENOMEM;
4529
4530 auth_data->bss = req->bss;
4531
4532 if (req->sae_data_len >= 4) {
4533 __le16 *pos = (__le16 *) req->sae_data;
4534 auth_data->sae_trans = le16_to_cpu(pos[0]);
4535 auth_data->sae_status = le16_to_cpu(pos[1]);
4536 memcpy(auth_data->data, req->sae_data + 4,
4537 req->sae_data_len - 4);
4538 auth_data->data_len += req->sae_data_len - 4;
4539 }
4540
4541 if (req->ie && req->ie_len) {
4542 memcpy(&auth_data->data[auth_data->data_len],
4543 req->ie, req->ie_len);
4544 auth_data->data_len += req->ie_len;
4545 }
4546
4547 if (req->key && req->key_len) {
4548 auth_data->key_len = req->key_len;
4549 auth_data->key_idx = req->key_idx;
4550 memcpy(auth_data->key, req->key, req->key_len);
4551 }
4552
4553 auth_data->algorithm = auth_alg;
4554
4555 /* try to authenticate/probe */
4556
4557 if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4558 ifmgd->assoc_data) {
4559 err = -EBUSY;
4560 goto err_free;
4561 }
4562
4563 if (ifmgd->auth_data)
4564 ieee80211_destroy_auth_data(sdata, false);
4565
4566 /* prep auth_data so we don't go into idle on disassoc */
4567 ifmgd->auth_data = auth_data;
4568
4569 if (ifmgd->associated) {
4570 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4571
4572 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4573 WLAN_REASON_UNSPECIFIED,
4574 false, frame_buf);
4575
4576 ieee80211_report_disconnect(sdata, frame_buf,
4577 sizeof(frame_buf), true,
4578 WLAN_REASON_UNSPECIFIED);
4579 }
4580
4581 sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4582
4583 err = ieee80211_prep_connection(sdata, req->bss, false, false);
4584 if (err)
4585 goto err_clear;
4586
4587 err = ieee80211_probe_auth(sdata);
4588 if (err) {
4589 sta_info_destroy_addr(sdata, req->bss->bssid);
4590 goto err_clear;
4591 }
4592
4593 /* hold our own reference */
4594 cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4595 return 0;
4596
4597 err_clear:
4598 eth_zero_addr(ifmgd->bssid);
4599 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4600 ifmgd->auth_data = NULL;
4601 mutex_lock(&sdata->local->mtx);
4602 ieee80211_vif_release_channel(sdata);
4603 mutex_unlock(&sdata->local->mtx);
4604 err_free:
4605 kfree(auth_data);
4606 return err;
4607 }
4608
4609 static bool ieee80211_usable_wmm_params(struct ieee80211_sub_if_data *sdata,
4610 const u8 *wmm_param, int len)
4611 {
4612 const u8 *pos;
4613 size_t left;
4614
4615 if (len < 8)
4616 return false;
4617
4618 if (wmm_param[5] != 1 /* version */)
4619 return false;
4620
4621 pos = wmm_param + 8;
4622 left = len - 8;
4623
4624 for (; left >= 4; left -= 4, pos += 4) {
4625 u8 aifsn = pos[0] & 0x0f;
4626 u8 ecwmin = pos[1] & 0x0f;
4627 u8 ecwmax = (pos[1] & 0xf0) >> 4;
4628 int aci = (pos[0] >> 5) & 0x03;
4629
4630 if (aifsn < 2) {
4631 sdata_info(sdata,
4632 "AP has invalid WMM params (AIFSN=%d for ACI %d), disabling WMM\n",
4633 aifsn, aci);
4634 return false;
4635 }
4636 if (ecwmin > ecwmax) {
4637 sdata_info(sdata,
4638 "AP has invalid WMM params (ECWmin/max=%d/%d for ACI %d), disabling WMM\n",
4639 ecwmin, ecwmax, aci);
4640 return false;
4641 }
4642 }
4643
4644 return true;
4645 }
4646
4647 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4648 struct cfg80211_assoc_request *req)
4649 {
4650 struct ieee80211_local *local = sdata->local;
4651 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4652 struct ieee80211_bss *bss = (void *)req->bss->priv;
4653 struct ieee80211_mgd_assoc_data *assoc_data;
4654 const struct cfg80211_bss_ies *beacon_ies;
4655 struct ieee80211_supported_band *sband;
4656 const u8 *ssidie, *ht_ie, *vht_ie;
4657 int i, err;
4658 bool override = false;
4659
4660 assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4661 if (!assoc_data)
4662 return -ENOMEM;
4663
4664 rcu_read_lock();
4665 ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4666 if (!ssidie) {
4667 rcu_read_unlock();
4668 kfree(assoc_data);
4669 return -EINVAL;
4670 }
4671 memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4672 assoc_data->ssid_len = ssidie[1];
4673 rcu_read_unlock();
4674
4675 if (ifmgd->associated) {
4676 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4677
4678 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4679 WLAN_REASON_UNSPECIFIED,
4680 false, frame_buf);
4681
4682 ieee80211_report_disconnect(sdata, frame_buf,
4683 sizeof(frame_buf), true,
4684 WLAN_REASON_UNSPECIFIED);
4685 }
4686
4687 if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4688 err = -EBUSY;
4689 goto err_free;
4690 }
4691
4692 if (ifmgd->assoc_data) {
4693 err = -EBUSY;
4694 goto err_free;
4695 }
4696
4697 if (ifmgd->auth_data) {
4698 bool match;
4699
4700 /* keep sta info, bssid if matching */
4701 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4702 ieee80211_destroy_auth_data(sdata, match);
4703 }
4704
4705 /* prepare assoc data */
4706
4707 ifmgd->beacon_crc_valid = false;
4708
4709 assoc_data->wmm = bss->wmm_used &&
4710 (local->hw.queues >= IEEE80211_NUM_ACS);
4711 if (assoc_data->wmm) {
4712 /* try to check validity of WMM params IE */
4713 const struct cfg80211_bss_ies *ies;
4714 const u8 *wp, *start, *end;
4715
4716 rcu_read_lock();
4717 ies = rcu_dereference(req->bss->ies);
4718 start = ies->data;
4719 end = start + ies->len;
4720
4721 while (true) {
4722 wp = cfg80211_find_vendor_ie(
4723 WLAN_OUI_MICROSOFT,
4724 WLAN_OUI_TYPE_MICROSOFT_WMM,
4725 start, end - start);
4726 if (!wp)
4727 break;
4728 start = wp + wp[1] + 2;
4729 /* if this IE is too short, try the next */
4730 if (wp[1] <= 4)
4731 continue;
4732 /* if this IE is WMM params, we found what we wanted */
4733 if (wp[6] == 1)
4734 break;
4735 }
4736
4737 if (!wp || !ieee80211_usable_wmm_params(sdata, wp + 2,
4738 wp[1] - 2)) {
4739 assoc_data->wmm = false;
4740 ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
4741 }
4742 rcu_read_unlock();
4743 }
4744
4745 /*
4746 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4747 * We still associate in non-HT mode (11a/b/g) if any one of these
4748 * ciphers is configured as pairwise.
4749 * We can set this to true for non-11n hardware, that'll be checked
4750 * separately along with the peer capabilities.
4751 */
4752 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4753 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4754 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4755 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4756 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4757 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4758 netdev_info(sdata->dev,
4759 "disabling HT/VHT due to WEP/TKIP use\n");
4760 }
4761 }
4762
4763 /* Also disable HT if we don't support it or the AP doesn't use WMM */
4764 sband = local->hw.wiphy->bands[req->bss->channel->band];
4765 if (!sband->ht_cap.ht_supported ||
4766 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4767 ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4768 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4769 if (!bss->wmm_used &&
4770 !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4771 netdev_info(sdata->dev,
4772 "disabling HT as WMM/QoS is not supported by the AP\n");
4773 }
4774
4775 /* disable VHT if we don't support it or the AP doesn't use WMM */
4776 if (!sband->vht_cap.vht_supported ||
4777 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4778 ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4779 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4780 if (!bss->wmm_used &&
4781 !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4782 netdev_info(sdata->dev,
4783 "disabling VHT as WMM/QoS is not supported by the AP\n");
4784 }
4785
4786 memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4787 memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4788 sizeof(ifmgd->ht_capa_mask));
4789
4790 memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4791 memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4792 sizeof(ifmgd->vht_capa_mask));
4793
4794 if (req->ie && req->ie_len) {
4795 memcpy(assoc_data->ie, req->ie, req->ie_len);
4796 assoc_data->ie_len = req->ie_len;
4797 }
4798
4799 assoc_data->bss = req->bss;
4800
4801 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4802 if (ifmgd->powersave)
4803 sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4804 else
4805 sdata->smps_mode = IEEE80211_SMPS_OFF;
4806 } else
4807 sdata->smps_mode = ifmgd->req_smps;
4808
4809 assoc_data->capability = req->bss->capability;
4810 assoc_data->supp_rates = bss->supp_rates;
4811 assoc_data->supp_rates_len = bss->supp_rates_len;
4812
4813 rcu_read_lock();
4814 ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4815 if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4816 assoc_data->ap_ht_param =
4817 ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4818 else
4819 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4820 vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4821 if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4822 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4823 sizeof(struct ieee80211_vht_cap));
4824 else
4825 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4826 rcu_read_unlock();
4827
4828 if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) &&
4829 ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK),
4830 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"))
4831 sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;
4832
4833 if (bss->wmm_used && bss->uapsd_supported &&
4834 (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) {
4835 assoc_data->uapsd = true;
4836 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4837 } else {
4838 assoc_data->uapsd = false;
4839 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4840 }
4841
4842 if (req->prev_bssid)
4843 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4844
4845 if (req->use_mfp) {
4846 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4847 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4848 } else {
4849 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4850 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4851 }
4852
4853 if (req->flags & ASSOC_REQ_USE_RRM)
4854 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
4855 else
4856 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;
4857
4858 if (req->crypto.control_port)
4859 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4860 else
4861 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4862
4863 sdata->control_port_protocol = req->crypto.control_port_ethertype;
4864 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4865 sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4866 sdata->vif.type);
4867
4868 /* kick off associate process */
4869
4870 ifmgd->assoc_data = assoc_data;
4871 ifmgd->dtim_period = 0;
4872 ifmgd->have_beacon = false;
4873
4874 /* override HT/VHT configuration only if the AP and we support it */
4875 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
4876 struct ieee80211_sta_ht_cap sta_ht_cap;
4877
4878 if (req->flags & ASSOC_REQ_DISABLE_HT)
4879 override = true;
4880
4881 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
4882 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
4883
4884 /* check for 40 MHz disable override */
4885 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ) &&
4886 sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
4887 !(sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
4888 override = true;
4889
4890 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4891 req->flags & ASSOC_REQ_DISABLE_VHT)
4892 override = true;
4893 }
4894
4895 if (req->flags & ASSOC_REQ_DISABLE_HT) {
4896 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4897 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4898 }
4899
4900 if (req->flags & ASSOC_REQ_DISABLE_VHT)
4901 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4902
4903 err = ieee80211_prep_connection(sdata, req->bss, true, override);
4904 if (err)
4905 goto err_clear;
4906
4907 rcu_read_lock();
4908 beacon_ies = rcu_dereference(req->bss->beacon_ies);
4909
4910 if (ieee80211_hw_check(&sdata->local->hw, NEED_DTIM_BEFORE_ASSOC) &&
4911 !beacon_ies) {
4912 /*
4913 * Wait up to one beacon interval ...
4914 * should this be more if we miss one?
4915 */
4916 sdata_info(sdata, "waiting for beacon from %pM\n",
4917 ifmgd->bssid);
4918 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4919 assoc_data->timeout_started = true;
4920 assoc_data->need_beacon = true;
4921 } else if (beacon_ies) {
4922 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4923 beacon_ies->data,
4924 beacon_ies->len);
4925 u8 dtim_count = 0;
4926
4927 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4928 const struct ieee80211_tim_ie *tim;
4929 tim = (void *)(tim_ie + 2);
4930 ifmgd->dtim_period = tim->dtim_period;
4931 dtim_count = tim->dtim_count;
4932 }
4933 ifmgd->have_beacon = true;
4934 assoc_data->timeout = jiffies;
4935 assoc_data->timeout_started = true;
4936
4937 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
4938 sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4939 sdata->vif.bss_conf.sync_device_ts =
4940 bss->device_ts_beacon;
4941 sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4942 }
4943 } else {
4944 assoc_data->timeout = jiffies;
4945 assoc_data->timeout_started = true;
4946 }
4947 rcu_read_unlock();
4948
4949 run_again(sdata, assoc_data->timeout);
4950
4951 if (bss->corrupt_data) {
4952 char *corrupt_type = "data";
4953 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4954 if (bss->corrupt_data &
4955 IEEE80211_BSS_CORRUPT_PROBE_RESP)
4956 corrupt_type = "beacon and probe response";
4957 else
4958 corrupt_type = "beacon";
4959 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4960 corrupt_type = "probe response";
4961 sdata_info(sdata, "associating with AP with corrupt %s\n",
4962 corrupt_type);
4963 }
4964
4965 return 0;
4966 err_clear:
4967 eth_zero_addr(ifmgd->bssid);
4968 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4969 ifmgd->assoc_data = NULL;
4970 err_free:
4971 kfree(assoc_data);
4972 return err;
4973 }
4974
4975 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4976 struct cfg80211_deauth_request *req)
4977 {
4978 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4979 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4980 bool tx = !req->local_state_change;
4981
4982 if (ifmgd->auth_data &&
4983 ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
4984 sdata_info(sdata,
4985 "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
4986 req->bssid, req->reason_code,
4987 ieee80211_get_reason_code_string(req->reason_code));
4988
4989 drv_mgd_prepare_tx(sdata->local, sdata);
4990 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4991 IEEE80211_STYPE_DEAUTH,
4992 req->reason_code, tx,
4993 frame_buf);
4994 ieee80211_destroy_auth_data(sdata, false);
4995 ieee80211_report_disconnect(sdata, frame_buf,
4996 sizeof(frame_buf), true,
4997 req->reason_code);
4998
4999 return 0;
5000 }
5001
5002 if (ifmgd->associated &&
5003 ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
5004 sdata_info(sdata,
5005 "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
5006 req->bssid, req->reason_code,
5007 ieee80211_get_reason_code_string(req->reason_code));
5008
5009 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
5010 req->reason_code, tx, frame_buf);
5011 ieee80211_report_disconnect(sdata, frame_buf,
5012 sizeof(frame_buf), true,
5013 req->reason_code);
5014 return 0;
5015 }
5016
5017 return -ENOTCONN;
5018 }
5019
5020 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
5021 struct cfg80211_disassoc_request *req)
5022 {
5023 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5024 u8 bssid[ETH_ALEN];
5025 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
5026
5027 /*
5028 * cfg80211 should catch this ... but it's racy since
5029 * we can receive a disassoc frame, process it, hand it
5030 * to cfg80211 while that's in a locked section already
5031 * trying to tell us that the user wants to disconnect.
5032 */
5033 if (ifmgd->associated != req->bss)
5034 return -ENOLINK;
5035
5036 sdata_info(sdata,
5037 "disassociating from %pM by local choice (Reason: %u=%s)\n",
5038 req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
5039
5040 memcpy(bssid, req->bss->bssid, ETH_ALEN);
5041 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
5042 req->reason_code, !req->local_state_change,
5043 frame_buf);
5044
5045 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
5046 req->reason_code);
5047
5048 return 0;
5049 }
5050
5051 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
5052 {
5053 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5054
5055 /*
5056 * Make sure some work items will not run after this,
5057 * they will not do anything but might not have been
5058 * cancelled when disconnecting.
5059 */
5060 cancel_work_sync(&ifmgd->monitor_work);
5061 cancel_work_sync(&ifmgd->beacon_connection_loss_work);
5062 cancel_work_sync(&ifmgd->request_smps_work);
5063 cancel_work_sync(&ifmgd->csa_connection_drop_work);
5064 cancel_work_sync(&ifmgd->chswitch_work);
5065 cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
5066
5067 sdata_lock(sdata);
5068 if (ifmgd->assoc_data) {
5069 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
5070 ieee80211_destroy_assoc_data(sdata, false);
5071 cfg80211_assoc_timeout(sdata->dev, bss);
5072 }
5073 if (ifmgd->auth_data)
5074 ieee80211_destroy_auth_data(sdata, false);
5075 spin_lock_bh(&ifmgd->teardown_lock);
5076 if (ifmgd->teardown_skb) {
5077 kfree_skb(ifmgd->teardown_skb);
5078 ifmgd->teardown_skb = NULL;
5079 ifmgd->orig_teardown_skb = NULL;
5080 }
5081 spin_unlock_bh(&ifmgd->teardown_lock);
5082 del_timer_sync(&ifmgd->timer);
5083 sdata_unlock(sdata);
5084 }
5085
5086 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
5087 enum nl80211_cqm_rssi_threshold_event rssi_event,
5088 gfp_t gfp)
5089 {
5090 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5091
5092 trace_api_cqm_rssi_notify(sdata, rssi_event);
5093
5094 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
5095 }
5096 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
5097
5098 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp)
5099 {
5100 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5101
5102 trace_api_cqm_beacon_loss_notify(sdata->local, sdata);
5103
5104 cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp);
5105 }
5106 EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify);
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