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