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3345401be1b3c26744cb2ab6e384672a0cab0d6b
[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 ifmgd->probe_send_count = 0;
135
136 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
137 return;
138
139 mod_timer(&sdata->u.mgd.conn_mon_timer,
140 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
141 }
142
143 static int ecw2cw(int ecw)
144 {
145 return (1 << ecw) - 1;
146 }
147
148 static u32
149 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
150 struct ieee80211_supported_band *sband,
151 struct ieee80211_channel *channel,
152 const struct ieee80211_ht_operation *ht_oper,
153 const struct ieee80211_vht_operation *vht_oper,
154 struct cfg80211_chan_def *chandef, bool tracking)
155 {
156 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
157 struct cfg80211_chan_def vht_chandef;
158 u32 ht_cfreq, ret;
159
160 chandef->chan = channel;
161 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
162 chandef->center_freq1 = channel->center_freq;
163 chandef->center_freq2 = 0;
164
165 if (!ht_oper || !sband->ht_cap.ht_supported) {
166 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
167 goto out;
168 }
169
170 chandef->width = NL80211_CHAN_WIDTH_20;
171
172 ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
173 channel->band);
174 /* check that channel matches the right operating channel */
175 if (!tracking && channel->center_freq != ht_cfreq) {
176 /*
177 * It's possible that some APs are confused here;
178 * Netgear WNDR3700 sometimes reports 4 higher than
179 * the actual channel in association responses, but
180 * since we look at probe response/beacon data here
181 * it should be OK.
182 */
183 sdata_info(sdata,
184 "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
185 channel->center_freq, ht_cfreq,
186 ht_oper->primary_chan, channel->band);
187 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
188 goto out;
189 }
190
191 /* check 40 MHz support, if we have it */
192 if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
193 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
194 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
195 chandef->width = NL80211_CHAN_WIDTH_40;
196 chandef->center_freq1 += 10;
197 break;
198 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
199 chandef->width = NL80211_CHAN_WIDTH_40;
200 chandef->center_freq1 -= 10;
201 break;
202 }
203 } else {
204 /* 40 MHz (and 80 MHz) must be supported for VHT */
205 ret = IEEE80211_STA_DISABLE_VHT;
206 /* also mark 40 MHz disabled */
207 ret |= IEEE80211_STA_DISABLE_40MHZ;
208 goto out;
209 }
210
211 if (!vht_oper || !sband->vht_cap.vht_supported) {
212 ret = IEEE80211_STA_DISABLE_VHT;
213 goto out;
214 }
215
216 vht_chandef.chan = channel;
217 vht_chandef.center_freq1 =
218 ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx,
219 channel->band);
220 vht_chandef.center_freq2 = 0;
221
222 switch (vht_oper->chan_width) {
223 case IEEE80211_VHT_CHANWIDTH_USE_HT:
224 vht_chandef.width = chandef->width;
225 vht_chandef.center_freq1 = chandef->center_freq1;
226 break;
227 case IEEE80211_VHT_CHANWIDTH_80MHZ:
228 vht_chandef.width = NL80211_CHAN_WIDTH_80;
229 break;
230 case IEEE80211_VHT_CHANWIDTH_160MHZ:
231 vht_chandef.width = NL80211_CHAN_WIDTH_160;
232 break;
233 case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
234 vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
235 vht_chandef.center_freq2 =
236 ieee80211_channel_to_frequency(
237 vht_oper->center_freq_seg2_idx,
238 channel->band);
239 break;
240 default:
241 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
242 sdata_info(sdata,
243 "AP VHT operation IE has invalid channel width (%d), disable VHT\n",
244 vht_oper->chan_width);
245 ret = IEEE80211_STA_DISABLE_VHT;
246 goto out;
247 }
248
249 if (!cfg80211_chandef_valid(&vht_chandef)) {
250 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
251 sdata_info(sdata,
252 "AP VHT information is invalid, disable VHT\n");
253 ret = IEEE80211_STA_DISABLE_VHT;
254 goto out;
255 }
256
257 if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
258 ret = 0;
259 goto out;
260 }
261
262 if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
263 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
264 sdata_info(sdata,
265 "AP VHT information doesn't match HT, disable VHT\n");
266 ret = IEEE80211_STA_DISABLE_VHT;
267 goto out;
268 }
269
270 *chandef = vht_chandef;
271
272 ret = 0;
273
274 out:
275 /*
276 * When tracking the current AP, don't do any further checks if the
277 * new chandef is identical to the one we're currently using for the
278 * connection. This keeps us from playing ping-pong with regulatory,
279 * without it the following can happen (for example):
280 * - connect to an AP with 80 MHz, world regdom allows 80 MHz
281 * - AP advertises regdom US
282 * - CRDA loads regdom US with 80 MHz prohibited (old database)
283 * - the code below detects an unsupported channel, downgrades, and
284 * we disconnect from the AP in the caller
285 * - disconnect causes CRDA to reload world regdomain and the game
286 * starts anew.
287 * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
288 *
289 * It seems possible that there are still scenarios with CSA or real
290 * bandwidth changes where a this could happen, but those cases are
291 * less common and wouldn't completely prevent using the AP.
292 */
293 if (tracking &&
294 cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
295 return ret;
296
297 /* don't print the message below for VHT mismatch if VHT is disabled */
298 if (ret & IEEE80211_STA_DISABLE_VHT)
299 vht_chandef = *chandef;
300
301 /*
302 * Ignore the DISABLED flag when we're already connected and only
303 * tracking the APs beacon for bandwidth changes - otherwise we
304 * might get disconnected here if we connect to an AP, update our
305 * regulatory information based on the AP's country IE and the
306 * information we have is wrong/outdated and disables the channel
307 * that we're actually using for the connection to the AP.
308 */
309 while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
310 tracking ? 0 :
311 IEEE80211_CHAN_DISABLED)) {
312 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
313 ret = IEEE80211_STA_DISABLE_HT |
314 IEEE80211_STA_DISABLE_VHT;
315 break;
316 }
317
318 ret |= ieee80211_chandef_downgrade(chandef);
319 }
320
321 if (chandef->width != vht_chandef.width && !tracking)
322 sdata_info(sdata,
323 "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
324
325 WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
326 return ret;
327 }
328
329 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
330 struct sta_info *sta,
331 const struct ieee80211_ht_operation *ht_oper,
332 const struct ieee80211_vht_operation *vht_oper,
333 const u8 *bssid, u32 *changed)
334 {
335 struct ieee80211_local *local = sdata->local;
336 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
337 struct ieee80211_supported_band *sband;
338 struct ieee80211_channel *chan;
339 struct cfg80211_chan_def chandef;
340 u16 ht_opmode;
341 u32 flags;
342 enum ieee80211_sta_rx_bandwidth new_sta_bw;
343 int ret;
344
345 /* if HT was/is disabled, don't track any bandwidth changes */
346 if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
347 return 0;
348
349 /* don't check VHT if we associated as non-VHT station */
350 if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
351 vht_oper = NULL;
352
353 if (WARN_ON_ONCE(!sta))
354 return -EINVAL;
355
356 /*
357 * if bss configuration changed store the new one -
358 * this may be applicable even if channel is identical
359 */
360 ht_opmode = le16_to_cpu(ht_oper->operation_mode);
361 if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
362 *changed |= BSS_CHANGED_HT;
363 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
364 }
365
366 chan = sdata->vif.bss_conf.chandef.chan;
367 sband = local->hw.wiphy->bands[chan->band];
368
369 /* calculate new channel (type) based on HT/VHT operation IEs */
370 flags = ieee80211_determine_chantype(sdata, sband, chan, ht_oper,
371 vht_oper, &chandef, true);
372
373 /*
374 * Downgrade the new channel if we associated with restricted
375 * capabilities. For example, if we associated as a 20 MHz STA
376 * to a 40 MHz AP (due to regulatory, capabilities or config
377 * reasons) then switching to a 40 MHz channel now won't do us
378 * any good -- we couldn't use it with the AP.
379 */
380 if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
381 chandef.width == NL80211_CHAN_WIDTH_80P80)
382 flags |= ieee80211_chandef_downgrade(&chandef);
383 if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
384 chandef.width == NL80211_CHAN_WIDTH_160)
385 flags |= ieee80211_chandef_downgrade(&chandef);
386 if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
387 chandef.width > NL80211_CHAN_WIDTH_20)
388 flags |= ieee80211_chandef_downgrade(&chandef);
389
390 if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
391 return 0;
392
393 sdata_info(sdata,
394 "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
395 ifmgd->bssid, chandef.chan->center_freq, chandef.width,
396 chandef.center_freq1, chandef.center_freq2);
397
398 if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
399 IEEE80211_STA_DISABLE_VHT |
400 IEEE80211_STA_DISABLE_40MHZ |
401 IEEE80211_STA_DISABLE_80P80MHZ |
402 IEEE80211_STA_DISABLE_160MHZ)) ||
403 !cfg80211_chandef_valid(&chandef)) {
404 sdata_info(sdata,
405 "AP %pM changed bandwidth in a way we can't support - disconnect\n",
406 ifmgd->bssid);
407 return -EINVAL;
408 }
409
410 switch (chandef.width) {
411 case NL80211_CHAN_WIDTH_20_NOHT:
412 case NL80211_CHAN_WIDTH_20:
413 new_sta_bw = IEEE80211_STA_RX_BW_20;
414 break;
415 case NL80211_CHAN_WIDTH_40:
416 new_sta_bw = IEEE80211_STA_RX_BW_40;
417 break;
418 case NL80211_CHAN_WIDTH_80:
419 new_sta_bw = IEEE80211_STA_RX_BW_80;
420 break;
421 case NL80211_CHAN_WIDTH_80P80:
422 case NL80211_CHAN_WIDTH_160:
423 new_sta_bw = IEEE80211_STA_RX_BW_160;
424 break;
425 default:
426 return -EINVAL;
427 }
428
429 if (new_sta_bw > sta->cur_max_bandwidth)
430 new_sta_bw = sta->cur_max_bandwidth;
431
432 if (new_sta_bw < sta->sta.bandwidth) {
433 sta->sta.bandwidth = new_sta_bw;
434 rate_control_rate_update(local, sband, sta,
435 IEEE80211_RC_BW_CHANGED);
436 }
437
438 ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
439 if (ret) {
440 sdata_info(sdata,
441 "AP %pM changed bandwidth to incompatible one - disconnect\n",
442 ifmgd->bssid);
443 return ret;
444 }
445
446 if (new_sta_bw > sta->sta.bandwidth) {
447 sta->sta.bandwidth = new_sta_bw;
448 rate_control_rate_update(local, sband, sta,
449 IEEE80211_RC_BW_CHANGED);
450 }
451
452 return 0;
453 }
454
455 /* frame sending functions */
456
457 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
458 struct sk_buff *skb, u8 ap_ht_param,
459 struct ieee80211_supported_band *sband,
460 struct ieee80211_channel *channel,
461 enum ieee80211_smps_mode smps)
462 {
463 u8 *pos;
464 u32 flags = channel->flags;
465 u16 cap;
466 struct ieee80211_sta_ht_cap ht_cap;
467
468 BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
469
470 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
471 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
472
473 /* determine capability flags */
474 cap = ht_cap.cap;
475
476 switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
477 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
478 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
479 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
480 cap &= ~IEEE80211_HT_CAP_SGI_40;
481 }
482 break;
483 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
484 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
485 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
486 cap &= ~IEEE80211_HT_CAP_SGI_40;
487 }
488 break;
489 }
490
491 /*
492 * If 40 MHz was disabled associate as though we weren't
493 * capable of 40 MHz -- some broken APs will never fall
494 * back to trying to transmit in 20 MHz.
495 */
496 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
497 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
498 cap &= ~IEEE80211_HT_CAP_SGI_40;
499 }
500
501 /* set SM PS mode properly */
502 cap &= ~IEEE80211_HT_CAP_SM_PS;
503 switch (smps) {
504 case IEEE80211_SMPS_AUTOMATIC:
505 case IEEE80211_SMPS_NUM_MODES:
506 WARN_ON(1);
507 case IEEE80211_SMPS_OFF:
508 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
509 IEEE80211_HT_CAP_SM_PS_SHIFT;
510 break;
511 case IEEE80211_SMPS_STATIC:
512 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
513 IEEE80211_HT_CAP_SM_PS_SHIFT;
514 break;
515 case IEEE80211_SMPS_DYNAMIC:
516 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
517 IEEE80211_HT_CAP_SM_PS_SHIFT;
518 break;
519 }
520
521 /* reserve and fill IE */
522 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
523 ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
524 }
525
526 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
527 struct sk_buff *skb,
528 struct ieee80211_supported_band *sband,
529 struct ieee80211_vht_cap *ap_vht_cap)
530 {
531 u8 *pos;
532 u32 cap;
533 struct ieee80211_sta_vht_cap vht_cap;
534 u32 mask, ap_bf_sts, our_bf_sts;
535
536 BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
537
538 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
539 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
540
541 /* determine capability flags */
542 cap = vht_cap.cap;
543
544 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
545 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ;
546 cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
547 }
548
549 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
550 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
551 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
552 }
553
554 /*
555 * Some APs apparently get confused if our capabilities are better
556 * than theirs, so restrict what we advertise in the assoc request.
557 */
558 if (!(ap_vht_cap->vht_cap_info &
559 cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
560 cap &= ~IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE;
561
562 mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
563
564 ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask;
565 our_bf_sts = cap & mask;
566
567 if (ap_bf_sts < our_bf_sts) {
568 cap &= ~mask;
569 cap |= ap_bf_sts;
570 }
571
572 /* reserve and fill IE */
573 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
574 ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
575 }
576
577 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
578 {
579 struct ieee80211_local *local = sdata->local;
580 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
581 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
582 struct sk_buff *skb;
583 struct ieee80211_mgmt *mgmt;
584 u8 *pos, qos_info;
585 size_t offset = 0, noffset;
586 int i, count, rates_len, supp_rates_len, shift;
587 u16 capab;
588 struct ieee80211_supported_band *sband;
589 struct ieee80211_chanctx_conf *chanctx_conf;
590 struct ieee80211_channel *chan;
591 u32 rate_flags, rates = 0;
592
593 sdata_assert_lock(sdata);
594
595 rcu_read_lock();
596 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
597 if (WARN_ON(!chanctx_conf)) {
598 rcu_read_unlock();
599 return;
600 }
601 chan = chanctx_conf->def.chan;
602 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
603 rcu_read_unlock();
604 sband = local->hw.wiphy->bands[chan->band];
605 shift = ieee80211_vif_get_shift(&sdata->vif);
606
607 if (assoc_data->supp_rates_len) {
608 /*
609 * Get all rates supported by the device and the AP as
610 * some APs don't like getting a superset of their rates
611 * in the association request (e.g. D-Link DAP 1353 in
612 * b-only mode)...
613 */
614 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
615 assoc_data->supp_rates,
616 assoc_data->supp_rates_len,
617 &rates);
618 } else {
619 /*
620 * In case AP not provide any supported rates information
621 * before association, we send information element(s) with
622 * all rates that we support.
623 */
624 rates_len = 0;
625 for (i = 0; i < sband->n_bitrates; i++) {
626 if ((rate_flags & sband->bitrates[i].flags)
627 != rate_flags)
628 continue;
629 rates |= BIT(i);
630 rates_len++;
631 }
632 }
633
634 skb = alloc_skb(local->hw.extra_tx_headroom +
635 sizeof(*mgmt) + /* bit too much but doesn't matter */
636 2 + assoc_data->ssid_len + /* SSID */
637 4 + rates_len + /* (extended) rates */
638 4 + /* power capability */
639 2 + 2 * sband->n_channels + /* supported channels */
640 2 + sizeof(struct ieee80211_ht_cap) + /* HT */
641 2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
642 assoc_data->ie_len + /* extra IEs */
643 9, /* WMM */
644 GFP_KERNEL);
645 if (!skb)
646 return;
647
648 skb_reserve(skb, local->hw.extra_tx_headroom);
649
650 capab = WLAN_CAPABILITY_ESS;
651
652 if (sband->band == IEEE80211_BAND_2GHZ) {
653 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
654 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
655 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
656 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
657 }
658
659 if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
660 capab |= WLAN_CAPABILITY_PRIVACY;
661
662 if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
663 (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
664 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
665
666 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
667 memset(mgmt, 0, 24);
668 memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
669 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
670 memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
671
672 if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
673 skb_put(skb, 10);
674 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
675 IEEE80211_STYPE_REASSOC_REQ);
676 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
677 mgmt->u.reassoc_req.listen_interval =
678 cpu_to_le16(local->hw.conf.listen_interval);
679 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
680 ETH_ALEN);
681 } else {
682 skb_put(skb, 4);
683 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
684 IEEE80211_STYPE_ASSOC_REQ);
685 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
686 mgmt->u.assoc_req.listen_interval =
687 cpu_to_le16(local->hw.conf.listen_interval);
688 }
689
690 /* SSID */
691 pos = skb_put(skb, 2 + assoc_data->ssid_len);
692 *pos++ = WLAN_EID_SSID;
693 *pos++ = assoc_data->ssid_len;
694 memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
695
696 /* add all rates which were marked to be used above */
697 supp_rates_len = rates_len;
698 if (supp_rates_len > 8)
699 supp_rates_len = 8;
700
701 pos = skb_put(skb, supp_rates_len + 2);
702 *pos++ = WLAN_EID_SUPP_RATES;
703 *pos++ = supp_rates_len;
704
705 count = 0;
706 for (i = 0; i < sband->n_bitrates; i++) {
707 if (BIT(i) & rates) {
708 int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
709 5 * (1 << shift));
710 *pos++ = (u8) rate;
711 if (++count == 8)
712 break;
713 }
714 }
715
716 if (rates_len > count) {
717 pos = skb_put(skb, rates_len - count + 2);
718 *pos++ = WLAN_EID_EXT_SUPP_RATES;
719 *pos++ = rates_len - count;
720
721 for (i++; i < sband->n_bitrates; i++) {
722 if (BIT(i) & rates) {
723 int rate;
724 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
725 5 * (1 << shift));
726 *pos++ = (u8) rate;
727 }
728 }
729 }
730
731 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
732 /* 1. power capabilities */
733 pos = skb_put(skb, 4);
734 *pos++ = WLAN_EID_PWR_CAPABILITY;
735 *pos++ = 2;
736 *pos++ = 0; /* min tx power */
737 /* max tx power */
738 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
739
740 /* 2. supported channels */
741 /* TODO: get this in reg domain format */
742 pos = skb_put(skb, 2 * sband->n_channels + 2);
743 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
744 *pos++ = 2 * sband->n_channels;
745 for (i = 0; i < sband->n_channels; i++) {
746 *pos++ = ieee80211_frequency_to_channel(
747 sband->channels[i].center_freq);
748 *pos++ = 1; /* one channel in the subband*/
749 }
750 }
751
752 /* if present, add any custom IEs that go before HT */
753 if (assoc_data->ie_len) {
754 static const u8 before_ht[] = {
755 WLAN_EID_SSID,
756 WLAN_EID_SUPP_RATES,
757 WLAN_EID_EXT_SUPP_RATES,
758 WLAN_EID_PWR_CAPABILITY,
759 WLAN_EID_SUPPORTED_CHANNELS,
760 WLAN_EID_RSN,
761 WLAN_EID_QOS_CAPA,
762 WLAN_EID_RRM_ENABLED_CAPABILITIES,
763 WLAN_EID_MOBILITY_DOMAIN,
764 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
765 };
766 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
767 before_ht, ARRAY_SIZE(before_ht),
768 offset);
769 pos = skb_put(skb, noffset - offset);
770 memcpy(pos, assoc_data->ie + offset, noffset - offset);
771 offset = noffset;
772 }
773
774 if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
775 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
776 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
777
778 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
779 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
780 sband, chan, sdata->smps_mode);
781
782 /* if present, add any custom IEs that go before VHT */
783 if (assoc_data->ie_len) {
784 static const u8 before_vht[] = {
785 WLAN_EID_SSID,
786 WLAN_EID_SUPP_RATES,
787 WLAN_EID_EXT_SUPP_RATES,
788 WLAN_EID_PWR_CAPABILITY,
789 WLAN_EID_SUPPORTED_CHANNELS,
790 WLAN_EID_RSN,
791 WLAN_EID_QOS_CAPA,
792 WLAN_EID_RRM_ENABLED_CAPABILITIES,
793 WLAN_EID_MOBILITY_DOMAIN,
794 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
795 WLAN_EID_HT_CAPABILITY,
796 WLAN_EID_BSS_COEX_2040,
797 WLAN_EID_EXT_CAPABILITY,
798 WLAN_EID_QOS_TRAFFIC_CAPA,
799 WLAN_EID_TIM_BCAST_REQ,
800 WLAN_EID_INTERWORKING,
801 };
802 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
803 before_vht, ARRAY_SIZE(before_vht),
804 offset);
805 pos = skb_put(skb, noffset - offset);
806 memcpy(pos, assoc_data->ie + offset, noffset - offset);
807 offset = noffset;
808 }
809
810 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
811 ieee80211_add_vht_ie(sdata, skb, sband,
812 &assoc_data->ap_vht_cap);
813
814 /* if present, add any custom non-vendor IEs that go after HT */
815 if (assoc_data->ie_len) {
816 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
817 assoc_data->ie_len,
818 offset);
819 pos = skb_put(skb, noffset - offset);
820 memcpy(pos, assoc_data->ie + offset, noffset - offset);
821 offset = noffset;
822 }
823
824 if (assoc_data->wmm) {
825 if (assoc_data->uapsd) {
826 qos_info = ifmgd->uapsd_queues;
827 qos_info |= (ifmgd->uapsd_max_sp_len <<
828 IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
829 } else {
830 qos_info = 0;
831 }
832
833 pos = skb_put(skb, 9);
834 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
835 *pos++ = 7; /* len */
836 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
837 *pos++ = 0x50;
838 *pos++ = 0xf2;
839 *pos++ = 2; /* WME */
840 *pos++ = 0; /* WME info */
841 *pos++ = 1; /* WME ver */
842 *pos++ = qos_info;
843 }
844
845 /* add any remaining custom (i.e. vendor specific here) IEs */
846 if (assoc_data->ie_len) {
847 noffset = assoc_data->ie_len;
848 pos = skb_put(skb, noffset - offset);
849 memcpy(pos, assoc_data->ie + offset, noffset - offset);
850 }
851
852 drv_mgd_prepare_tx(local, sdata);
853
854 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
855 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
856 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
857 IEEE80211_TX_INTFL_MLME_CONN_TX;
858 ieee80211_tx_skb(sdata, skb);
859 }
860
861 void ieee80211_send_pspoll(struct ieee80211_local *local,
862 struct ieee80211_sub_if_data *sdata)
863 {
864 struct ieee80211_pspoll *pspoll;
865 struct sk_buff *skb;
866
867 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
868 if (!skb)
869 return;
870
871 pspoll = (struct ieee80211_pspoll *) skb->data;
872 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
873
874 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
875 ieee80211_tx_skb(sdata, skb);
876 }
877
878 void ieee80211_send_nullfunc(struct ieee80211_local *local,
879 struct ieee80211_sub_if_data *sdata,
880 int powersave)
881 {
882 struct sk_buff *skb;
883 struct ieee80211_hdr_3addr *nullfunc;
884 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
885
886 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
887 if (!skb)
888 return;
889
890 nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
891 if (powersave)
892 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
893
894 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
895 IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
896
897 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
898 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
899
900 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
901 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
902
903 ieee80211_tx_skb(sdata, skb);
904 }
905
906 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
907 struct ieee80211_sub_if_data *sdata)
908 {
909 struct sk_buff *skb;
910 struct ieee80211_hdr *nullfunc;
911 __le16 fc;
912
913 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
914 return;
915
916 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
917 if (!skb)
918 return;
919
920 skb_reserve(skb, local->hw.extra_tx_headroom);
921
922 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
923 memset(nullfunc, 0, 30);
924 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
925 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
926 nullfunc->frame_control = fc;
927 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
928 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
929 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
930 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
931
932 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
933 ieee80211_tx_skb(sdata, skb);
934 }
935
936 /* spectrum management related things */
937 static void ieee80211_chswitch_work(struct work_struct *work)
938 {
939 struct ieee80211_sub_if_data *sdata =
940 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
941 struct ieee80211_local *local = sdata->local;
942 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
943 u32 changed = 0;
944 int ret;
945
946 if (!ieee80211_sdata_running(sdata))
947 return;
948
949 sdata_lock(sdata);
950 if (!ifmgd->associated)
951 goto out;
952
953 mutex_lock(&local->mtx);
954 ret = ieee80211_vif_change_channel(sdata, &changed);
955 mutex_unlock(&local->mtx);
956 if (ret) {
957 sdata_info(sdata,
958 "vif channel switch failed, disconnecting\n");
959 ieee80211_queue_work(&sdata->local->hw,
960 &ifmgd->csa_connection_drop_work);
961 goto out;
962 }
963
964 if (!local->use_chanctx) {
965 local->_oper_chandef = sdata->csa_chandef;
966 /* Call "hw_config" only if doing sw channel switch.
967 * Otherwise update the channel directly
968 */
969 if (!local->ops->channel_switch)
970 ieee80211_hw_config(local, 0);
971 else
972 local->hw.conf.chandef = local->_oper_chandef;
973 }
974
975 /* XXX: shouldn't really modify cfg80211-owned data! */
976 ifmgd->associated->channel = sdata->csa_chandef.chan;
977
978 ieee80211_bss_info_change_notify(sdata, changed);
979
980 mutex_lock(&local->mtx);
981 sdata->vif.csa_active = false;
982 /* XXX: wait for a beacon first? */
983 if (!ieee80211_csa_needs_block_tx(local))
984 ieee80211_wake_queues_by_reason(&local->hw,
985 IEEE80211_MAX_QUEUE_MAP,
986 IEEE80211_QUEUE_STOP_REASON_CSA);
987 mutex_unlock(&local->mtx);
988
989 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
990
991 ieee80211_sta_reset_beacon_monitor(sdata);
992 ieee80211_sta_reset_conn_monitor(sdata);
993
994 out:
995 sdata_unlock(sdata);
996 }
997
998 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
999 {
1000 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1001 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1002
1003 trace_api_chswitch_done(sdata, success);
1004 if (!success) {
1005 sdata_info(sdata,
1006 "driver channel switch failed, disconnecting\n");
1007 ieee80211_queue_work(&sdata->local->hw,
1008 &ifmgd->csa_connection_drop_work);
1009 } else {
1010 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1011 }
1012 }
1013 EXPORT_SYMBOL(ieee80211_chswitch_done);
1014
1015 static void ieee80211_chswitch_timer(unsigned long data)
1016 {
1017 struct ieee80211_sub_if_data *sdata =
1018 (struct ieee80211_sub_if_data *) data;
1019
1020 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1021 }
1022
1023 static void
1024 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1025 u64 timestamp, struct ieee802_11_elems *elems,
1026 bool beacon)
1027 {
1028 struct ieee80211_local *local = sdata->local;
1029 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1030 struct cfg80211_bss *cbss = ifmgd->associated;
1031 struct ieee80211_chanctx *chanctx;
1032 enum ieee80211_band current_band;
1033 struct ieee80211_csa_ie csa_ie;
1034 int res;
1035
1036 sdata_assert_lock(sdata);
1037
1038 if (!cbss)
1039 return;
1040
1041 if (local->scanning)
1042 return;
1043
1044 /* disregard subsequent announcements if we are already processing */
1045 if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
1046 return;
1047
1048 current_band = cbss->channel->band;
1049 memset(&csa_ie, 0, sizeof(csa_ie));
1050 res = ieee80211_parse_ch_switch_ie(sdata, elems, beacon, current_band,
1051 ifmgd->flags,
1052 ifmgd->associated->bssid, &csa_ie);
1053 if (res < 0)
1054 ieee80211_queue_work(&local->hw,
1055 &ifmgd->csa_connection_drop_work);
1056 if (res)
1057 return;
1058
1059 if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1060 IEEE80211_CHAN_DISABLED)) {
1061 sdata_info(sdata,
1062 "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1063 ifmgd->associated->bssid,
1064 csa_ie.chandef.chan->center_freq,
1065 csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1066 csa_ie.chandef.center_freq2);
1067 ieee80211_queue_work(&local->hw,
1068 &ifmgd->csa_connection_drop_work);
1069 return;
1070 }
1071
1072 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
1073
1074 mutex_lock(&local->chanctx_mtx);
1075 if (local->use_chanctx) {
1076 u32 num_chanctx = 0;
1077 list_for_each_entry(chanctx, &local->chanctx_list, list)
1078 num_chanctx++;
1079
1080 if (num_chanctx > 1 ||
1081 !(local->hw.flags & IEEE80211_HW_CHANCTX_STA_CSA)) {
1082 sdata_info(sdata,
1083 "not handling chan-switch with channel contexts\n");
1084 ieee80211_queue_work(&local->hw,
1085 &ifmgd->csa_connection_drop_work);
1086 mutex_unlock(&local->chanctx_mtx);
1087 return;
1088 }
1089 }
1090
1091 if (WARN_ON(!rcu_access_pointer(sdata->vif.chanctx_conf))) {
1092 ieee80211_queue_work(&local->hw,
1093 &ifmgd->csa_connection_drop_work);
1094 mutex_unlock(&local->chanctx_mtx);
1095 return;
1096 }
1097 chanctx = container_of(rcu_access_pointer(sdata->vif.chanctx_conf),
1098 struct ieee80211_chanctx, conf);
1099 if (ieee80211_chanctx_refcount(local, chanctx) > 1) {
1100 sdata_info(sdata,
1101 "channel switch with multiple interfaces on the same channel, disconnecting\n");
1102 ieee80211_queue_work(&local->hw,
1103 &ifmgd->csa_connection_drop_work);
1104 mutex_unlock(&local->chanctx_mtx);
1105 return;
1106 }
1107 mutex_unlock(&local->chanctx_mtx);
1108
1109 sdata->csa_chandef = csa_ie.chandef;
1110
1111 mutex_lock(&local->mtx);
1112 sdata->vif.csa_active = true;
1113 sdata->csa_block_tx = csa_ie.mode;
1114
1115 if (sdata->csa_block_tx)
1116 ieee80211_stop_queues_by_reason(&local->hw,
1117 IEEE80211_MAX_QUEUE_MAP,
1118 IEEE80211_QUEUE_STOP_REASON_CSA);
1119 mutex_unlock(&local->mtx);
1120
1121 if (local->ops->channel_switch) {
1122 /* use driver's channel switch callback */
1123 struct ieee80211_channel_switch ch_switch = {
1124 .timestamp = timestamp,
1125 .block_tx = csa_ie.mode,
1126 .chandef = csa_ie.chandef,
1127 .count = csa_ie.count,
1128 };
1129
1130 drv_channel_switch(local, &ch_switch);
1131 return;
1132 }
1133
1134 /* channel switch handled in software */
1135 if (csa_ie.count <= 1)
1136 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1137 else
1138 mod_timer(&ifmgd->chswitch_timer,
1139 TU_TO_EXP_TIME(csa_ie.count * cbss->beacon_interval));
1140 }
1141
1142 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1143 struct ieee80211_channel *channel,
1144 const u8 *country_ie, u8 country_ie_len,
1145 const u8 *pwr_constr_elem)
1146 {
1147 struct ieee80211_country_ie_triplet *triplet;
1148 int chan = ieee80211_frequency_to_channel(channel->center_freq);
1149 int i, chan_pwr, chan_increment, new_ap_level;
1150 bool have_chan_pwr = false;
1151
1152 /* Invalid IE */
1153 if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1154 return 0;
1155
1156 triplet = (void *)(country_ie + 3);
1157 country_ie_len -= 3;
1158
1159 switch (channel->band) {
1160 default:
1161 WARN_ON_ONCE(1);
1162 /* fall through */
1163 case IEEE80211_BAND_2GHZ:
1164 case IEEE80211_BAND_60GHZ:
1165 chan_increment = 1;
1166 break;
1167 case IEEE80211_BAND_5GHZ:
1168 chan_increment = 4;
1169 break;
1170 }
1171
1172 /* find channel */
1173 while (country_ie_len >= 3) {
1174 u8 first_channel = triplet->chans.first_channel;
1175
1176 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1177 goto next;
1178
1179 for (i = 0; i < triplet->chans.num_channels; i++) {
1180 if (first_channel + i * chan_increment == chan) {
1181 have_chan_pwr = true;
1182 chan_pwr = triplet->chans.max_power;
1183 break;
1184 }
1185 }
1186 if (have_chan_pwr)
1187 break;
1188
1189 next:
1190 triplet++;
1191 country_ie_len -= 3;
1192 }
1193
1194 if (!have_chan_pwr)
1195 return 0;
1196
1197 new_ap_level = max_t(int, 0, chan_pwr - *pwr_constr_elem);
1198
1199 if (sdata->ap_power_level == new_ap_level)
1200 return 0;
1201
1202 sdata_info(sdata,
1203 "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1204 new_ap_level, chan_pwr, *pwr_constr_elem,
1205 sdata->u.mgd.bssid);
1206 sdata->ap_power_level = new_ap_level;
1207 if (__ieee80211_recalc_txpower(sdata))
1208 return BSS_CHANGED_TXPOWER;
1209 return 0;
1210 }
1211
1212 /* powersave */
1213 static void ieee80211_enable_ps(struct ieee80211_local *local,
1214 struct ieee80211_sub_if_data *sdata)
1215 {
1216 struct ieee80211_conf *conf = &local->hw.conf;
1217
1218 /*
1219 * If we are scanning right now then the parameters will
1220 * take effect when scan finishes.
1221 */
1222 if (local->scanning)
1223 return;
1224
1225 if (conf->dynamic_ps_timeout > 0 &&
1226 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
1227 mod_timer(&local->dynamic_ps_timer, jiffies +
1228 msecs_to_jiffies(conf->dynamic_ps_timeout));
1229 } else {
1230 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1231 ieee80211_send_nullfunc(local, sdata, 1);
1232
1233 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1234 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
1235 return;
1236
1237 conf->flags |= IEEE80211_CONF_PS;
1238 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1239 }
1240 }
1241
1242 static void ieee80211_change_ps(struct ieee80211_local *local)
1243 {
1244 struct ieee80211_conf *conf = &local->hw.conf;
1245
1246 if (local->ps_sdata) {
1247 ieee80211_enable_ps(local, local->ps_sdata);
1248 } else if (conf->flags & IEEE80211_CONF_PS) {
1249 conf->flags &= ~IEEE80211_CONF_PS;
1250 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1251 del_timer_sync(&local->dynamic_ps_timer);
1252 cancel_work_sync(&local->dynamic_ps_enable_work);
1253 }
1254 }
1255
1256 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1257 {
1258 struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1259 struct sta_info *sta = NULL;
1260 bool authorized = false;
1261
1262 if (!mgd->powersave)
1263 return false;
1264
1265 if (mgd->broken_ap)
1266 return false;
1267
1268 if (!mgd->associated)
1269 return false;
1270
1271 if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1272 return false;
1273
1274 if (!mgd->have_beacon)
1275 return false;
1276
1277 rcu_read_lock();
1278 sta = sta_info_get(sdata, mgd->bssid);
1279 if (sta)
1280 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1281 rcu_read_unlock();
1282
1283 return authorized;
1284 }
1285
1286 /* need to hold RTNL or interface lock */
1287 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1288 {
1289 struct ieee80211_sub_if_data *sdata, *found = NULL;
1290 int count = 0;
1291 int timeout;
1292
1293 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
1294 local->ps_sdata = NULL;
1295 return;
1296 }
1297
1298 list_for_each_entry(sdata, &local->interfaces, list) {
1299 if (!ieee80211_sdata_running(sdata))
1300 continue;
1301 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1302 /* If an AP vif is found, then disable PS
1303 * by setting the count to zero thereby setting
1304 * ps_sdata to NULL.
1305 */
1306 count = 0;
1307 break;
1308 }
1309 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1310 continue;
1311 found = sdata;
1312 count++;
1313 }
1314
1315 if (count == 1 && ieee80211_powersave_allowed(found)) {
1316 s32 beaconint_us;
1317
1318 if (latency < 0)
1319 latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1320
1321 beaconint_us = ieee80211_tu_to_usec(
1322 found->vif.bss_conf.beacon_int);
1323
1324 timeout = local->dynamic_ps_forced_timeout;
1325 if (timeout < 0) {
1326 /*
1327 * Go to full PSM if the user configures a very low
1328 * latency requirement.
1329 * The 2000 second value is there for compatibility
1330 * until the PM_QOS_NETWORK_LATENCY is configured
1331 * with real values.
1332 */
1333 if (latency > (1900 * USEC_PER_MSEC) &&
1334 latency != (2000 * USEC_PER_SEC))
1335 timeout = 0;
1336 else
1337 timeout = 100;
1338 }
1339 local->hw.conf.dynamic_ps_timeout = timeout;
1340
1341 if (beaconint_us > latency) {
1342 local->ps_sdata = NULL;
1343 } else {
1344 int maxslp = 1;
1345 u8 dtimper = found->u.mgd.dtim_period;
1346
1347 /* If the TIM IE is invalid, pretend the value is 1 */
1348 if (!dtimper)
1349 dtimper = 1;
1350 else if (dtimper > 1)
1351 maxslp = min_t(int, dtimper,
1352 latency / beaconint_us);
1353
1354 local->hw.conf.max_sleep_period = maxslp;
1355 local->hw.conf.ps_dtim_period = dtimper;
1356 local->ps_sdata = found;
1357 }
1358 } else {
1359 local->ps_sdata = NULL;
1360 }
1361
1362 ieee80211_change_ps(local);
1363 }
1364
1365 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1366 {
1367 bool ps_allowed = ieee80211_powersave_allowed(sdata);
1368
1369 if (sdata->vif.bss_conf.ps != ps_allowed) {
1370 sdata->vif.bss_conf.ps = ps_allowed;
1371 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1372 }
1373 }
1374
1375 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1376 {
1377 struct ieee80211_local *local =
1378 container_of(work, struct ieee80211_local,
1379 dynamic_ps_disable_work);
1380
1381 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1382 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1383 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1384 }
1385
1386 ieee80211_wake_queues_by_reason(&local->hw,
1387 IEEE80211_MAX_QUEUE_MAP,
1388 IEEE80211_QUEUE_STOP_REASON_PS);
1389 }
1390
1391 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1392 {
1393 struct ieee80211_local *local =
1394 container_of(work, struct ieee80211_local,
1395 dynamic_ps_enable_work);
1396 struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1397 struct ieee80211_if_managed *ifmgd;
1398 unsigned long flags;
1399 int q;
1400
1401 /* can only happen when PS was just disabled anyway */
1402 if (!sdata)
1403 return;
1404
1405 ifmgd = &sdata->u.mgd;
1406
1407 if (local->hw.conf.flags & IEEE80211_CONF_PS)
1408 return;
1409
1410 if (local->hw.conf.dynamic_ps_timeout > 0) {
1411 /* don't enter PS if TX frames are pending */
1412 if (drv_tx_frames_pending(local)) {
1413 mod_timer(&local->dynamic_ps_timer, jiffies +
1414 msecs_to_jiffies(
1415 local->hw.conf.dynamic_ps_timeout));
1416 return;
1417 }
1418
1419 /*
1420 * transmission can be stopped by others which leads to
1421 * dynamic_ps_timer expiry. Postpone the ps timer if it
1422 * is not the actual idle state.
1423 */
1424 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1425 for (q = 0; q < local->hw.queues; q++) {
1426 if (local->queue_stop_reasons[q]) {
1427 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1428 flags);
1429 mod_timer(&local->dynamic_ps_timer, jiffies +
1430 msecs_to_jiffies(
1431 local->hw.conf.dynamic_ps_timeout));
1432 return;
1433 }
1434 }
1435 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1436 }
1437
1438 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1439 !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1440 if (drv_tx_frames_pending(local)) {
1441 mod_timer(&local->dynamic_ps_timer, jiffies +
1442 msecs_to_jiffies(
1443 local->hw.conf.dynamic_ps_timeout));
1444 } else {
1445 ieee80211_send_nullfunc(local, sdata, 1);
1446 /* Flush to get the tx status of nullfunc frame */
1447 ieee80211_flush_queues(local, sdata);
1448 }
1449 }
1450
1451 if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1452 (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1453 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1454 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1455 local->hw.conf.flags |= IEEE80211_CONF_PS;
1456 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1457 }
1458 }
1459
1460 void ieee80211_dynamic_ps_timer(unsigned long data)
1461 {
1462 struct ieee80211_local *local = (void *) data;
1463
1464 if (local->quiescing || local->suspended)
1465 return;
1466
1467 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1468 }
1469
1470 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1471 {
1472 struct delayed_work *delayed_work =
1473 container_of(work, struct delayed_work, work);
1474 struct ieee80211_sub_if_data *sdata =
1475 container_of(delayed_work, struct ieee80211_sub_if_data,
1476 dfs_cac_timer_work);
1477 struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1478
1479 mutex_lock(&sdata->local->mtx);
1480 if (sdata->wdev.cac_started) {
1481 ieee80211_vif_release_channel(sdata);
1482 cfg80211_cac_event(sdata->dev, &chandef,
1483 NL80211_RADAR_CAC_FINISHED,
1484 GFP_KERNEL);
1485 }
1486 mutex_unlock(&sdata->local->mtx);
1487 }
1488
1489 /* MLME */
1490 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1491 struct ieee80211_sub_if_data *sdata,
1492 const u8 *wmm_param, size_t wmm_param_len)
1493 {
1494 struct ieee80211_tx_queue_params params;
1495 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1496 size_t left;
1497 int count;
1498 const u8 *pos;
1499 u8 uapsd_queues = 0;
1500
1501 if (!local->ops->conf_tx)
1502 return false;
1503
1504 if (local->hw.queues < IEEE80211_NUM_ACS)
1505 return false;
1506
1507 if (!wmm_param)
1508 return false;
1509
1510 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1511 return false;
1512
1513 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1514 uapsd_queues = ifmgd->uapsd_queues;
1515
1516 count = wmm_param[6] & 0x0f;
1517 if (count == ifmgd->wmm_last_param_set)
1518 return false;
1519 ifmgd->wmm_last_param_set = count;
1520
1521 pos = wmm_param + 8;
1522 left = wmm_param_len - 8;
1523
1524 memset(&params, 0, sizeof(params));
1525
1526 sdata->wmm_acm = 0;
1527 for (; left >= 4; left -= 4, pos += 4) {
1528 int aci = (pos[0] >> 5) & 0x03;
1529 int acm = (pos[0] >> 4) & 0x01;
1530 bool uapsd = false;
1531 int queue;
1532
1533 switch (aci) {
1534 case 1: /* AC_BK */
1535 queue = 3;
1536 if (acm)
1537 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1538 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1539 uapsd = true;
1540 break;
1541 case 2: /* AC_VI */
1542 queue = 1;
1543 if (acm)
1544 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1545 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1546 uapsd = true;
1547 break;
1548 case 3: /* AC_VO */
1549 queue = 0;
1550 if (acm)
1551 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1552 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1553 uapsd = true;
1554 break;
1555 case 0: /* AC_BE */
1556 default:
1557 queue = 2;
1558 if (acm)
1559 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1560 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1561 uapsd = true;
1562 break;
1563 }
1564
1565 params.aifs = pos[0] & 0x0f;
1566 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1567 params.cw_min = ecw2cw(pos[1] & 0x0f);
1568 params.txop = get_unaligned_le16(pos + 2);
1569 params.acm = acm;
1570 params.uapsd = uapsd;
1571
1572 mlme_dbg(sdata,
1573 "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1574 queue, aci, acm,
1575 params.aifs, params.cw_min, params.cw_max,
1576 params.txop, params.uapsd);
1577 sdata->tx_conf[queue] = params;
1578 if (drv_conf_tx(local, sdata, queue, &params))
1579 sdata_err(sdata,
1580 "failed to set TX queue parameters for queue %d\n",
1581 queue);
1582 }
1583
1584 /* enable WMM or activate new settings */
1585 sdata->vif.bss_conf.qos = true;
1586 return true;
1587 }
1588
1589 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1590 {
1591 lockdep_assert_held(&sdata->local->mtx);
1592
1593 sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1594 ieee80211_run_deferred_scan(sdata->local);
1595 }
1596
1597 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1598 {
1599 mutex_lock(&sdata->local->mtx);
1600 __ieee80211_stop_poll(sdata);
1601 mutex_unlock(&sdata->local->mtx);
1602 }
1603
1604 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1605 u16 capab, bool erp_valid, u8 erp)
1606 {
1607 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1608 u32 changed = 0;
1609 bool use_protection;
1610 bool use_short_preamble;
1611 bool use_short_slot;
1612
1613 if (erp_valid) {
1614 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1615 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1616 } else {
1617 use_protection = false;
1618 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1619 }
1620
1621 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1622 if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1623 use_short_slot = true;
1624
1625 if (use_protection != bss_conf->use_cts_prot) {
1626 bss_conf->use_cts_prot = use_protection;
1627 changed |= BSS_CHANGED_ERP_CTS_PROT;
1628 }
1629
1630 if (use_short_preamble != bss_conf->use_short_preamble) {
1631 bss_conf->use_short_preamble = use_short_preamble;
1632 changed |= BSS_CHANGED_ERP_PREAMBLE;
1633 }
1634
1635 if (use_short_slot != bss_conf->use_short_slot) {
1636 bss_conf->use_short_slot = use_short_slot;
1637 changed |= BSS_CHANGED_ERP_SLOT;
1638 }
1639
1640 return changed;
1641 }
1642
1643 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1644 struct cfg80211_bss *cbss,
1645 u32 bss_info_changed)
1646 {
1647 struct ieee80211_bss *bss = (void *)cbss->priv;
1648 struct ieee80211_local *local = sdata->local;
1649 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1650
1651 bss_info_changed |= BSS_CHANGED_ASSOC;
1652 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1653 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1654
1655 sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1656 beacon_loss_count * bss_conf->beacon_int));
1657
1658 sdata->u.mgd.associated = cbss;
1659 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1660
1661 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1662
1663 if (sdata->vif.p2p) {
1664 const struct cfg80211_bss_ies *ies;
1665
1666 rcu_read_lock();
1667 ies = rcu_dereference(cbss->ies);
1668 if (ies) {
1669 int ret;
1670
1671 ret = cfg80211_get_p2p_attr(
1672 ies->data, ies->len,
1673 IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1674 (u8 *) &bss_conf->p2p_noa_attr,
1675 sizeof(bss_conf->p2p_noa_attr));
1676 if (ret >= 2) {
1677 sdata->u.mgd.p2p_noa_index =
1678 bss_conf->p2p_noa_attr.index;
1679 bss_info_changed |= BSS_CHANGED_P2P_PS;
1680 }
1681 }
1682 rcu_read_unlock();
1683 }
1684
1685 /* just to be sure */
1686 ieee80211_stop_poll(sdata);
1687
1688 ieee80211_led_assoc(local, 1);
1689
1690 if (sdata->u.mgd.have_beacon) {
1691 /*
1692 * If the AP is buggy we may get here with no DTIM period
1693 * known, so assume it's 1 which is the only safe assumption
1694 * in that case, although if the TIM IE is broken powersave
1695 * probably just won't work at all.
1696 */
1697 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1698 bss_conf->beacon_rate = bss->beacon_rate;
1699 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1700 } else {
1701 bss_conf->beacon_rate = NULL;
1702 bss_conf->dtim_period = 0;
1703 }
1704
1705 bss_conf->assoc = 1;
1706
1707 /* Tell the driver to monitor connection quality (if supported) */
1708 if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1709 bss_conf->cqm_rssi_thold)
1710 bss_info_changed |= BSS_CHANGED_CQM;
1711
1712 /* Enable ARP filtering */
1713 if (bss_conf->arp_addr_cnt)
1714 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1715
1716 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1717
1718 mutex_lock(&local->iflist_mtx);
1719 ieee80211_recalc_ps(local, -1);
1720 mutex_unlock(&local->iflist_mtx);
1721
1722 ieee80211_recalc_smps(sdata);
1723 ieee80211_recalc_ps_vif(sdata);
1724
1725 netif_carrier_on(sdata->dev);
1726 }
1727
1728 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1729 u16 stype, u16 reason, bool tx,
1730 u8 *frame_buf)
1731 {
1732 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1733 struct ieee80211_local *local = sdata->local;
1734 u32 changed = 0;
1735
1736 sdata_assert_lock(sdata);
1737
1738 if (WARN_ON_ONCE(tx && !frame_buf))
1739 return;
1740
1741 if (WARN_ON(!ifmgd->associated))
1742 return;
1743
1744 ieee80211_stop_poll(sdata);
1745
1746 ifmgd->associated = NULL;
1747 netif_carrier_off(sdata->dev);
1748
1749 /*
1750 * if we want to get out of ps before disassoc (why?) we have
1751 * to do it before sending disassoc, as otherwise the null-packet
1752 * won't be valid.
1753 */
1754 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1755 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1756 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1757 }
1758 local->ps_sdata = NULL;
1759
1760 /* disable per-vif ps */
1761 ieee80211_recalc_ps_vif(sdata);
1762
1763 /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
1764 if (tx)
1765 ieee80211_flush_queues(local, sdata);
1766
1767 /* deauthenticate/disassociate now */
1768 if (tx || frame_buf)
1769 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
1770 reason, tx, frame_buf);
1771
1772 /* flush out frame */
1773 if (tx)
1774 ieee80211_flush_queues(local, sdata);
1775
1776 /* clear bssid only after building the needed mgmt frames */
1777 memset(ifmgd->bssid, 0, ETH_ALEN);
1778
1779 /* remove AP and TDLS peers */
1780 sta_info_flush(sdata);
1781
1782 /* finally reset all BSS / config parameters */
1783 changed |= ieee80211_reset_erp_info(sdata);
1784
1785 ieee80211_led_assoc(local, 0);
1786 changed |= BSS_CHANGED_ASSOC;
1787 sdata->vif.bss_conf.assoc = false;
1788
1789 ifmgd->p2p_noa_index = -1;
1790 memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
1791 sizeof(sdata->vif.bss_conf.p2p_noa_attr));
1792
1793 /* on the next assoc, re-program HT/VHT parameters */
1794 memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1795 memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1796 memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
1797 memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
1798
1799 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1800
1801 del_timer_sync(&local->dynamic_ps_timer);
1802 cancel_work_sync(&local->dynamic_ps_enable_work);
1803
1804 /* Disable ARP filtering */
1805 if (sdata->vif.bss_conf.arp_addr_cnt)
1806 changed |= BSS_CHANGED_ARP_FILTER;
1807
1808 sdata->vif.bss_conf.qos = false;
1809 changed |= BSS_CHANGED_QOS;
1810
1811 /* The BSSID (not really interesting) and HT changed */
1812 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1813 ieee80211_bss_info_change_notify(sdata, changed);
1814
1815 /* disassociated - set to defaults now */
1816 ieee80211_set_wmm_default(sdata, false);
1817
1818 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1819 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1820 del_timer_sync(&sdata->u.mgd.timer);
1821 del_timer_sync(&sdata->u.mgd.chswitch_timer);
1822
1823 sdata->vif.bss_conf.dtim_period = 0;
1824 sdata->vif.bss_conf.beacon_rate = NULL;
1825
1826 ifmgd->have_beacon = false;
1827
1828 ifmgd->flags = 0;
1829 mutex_lock(&local->mtx);
1830 ieee80211_vif_release_channel(sdata);
1831
1832 sdata->vif.csa_active = false;
1833 if (!ieee80211_csa_needs_block_tx(local))
1834 ieee80211_wake_queues_by_reason(&local->hw,
1835 IEEE80211_MAX_QUEUE_MAP,
1836 IEEE80211_QUEUE_STOP_REASON_CSA);
1837 mutex_unlock(&local->mtx);
1838
1839 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1840 }
1841
1842 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1843 struct ieee80211_hdr *hdr)
1844 {
1845 /*
1846 * We can postpone the mgd.timer whenever receiving unicast frames
1847 * from AP because we know that the connection is working both ways
1848 * at that time. But multicast frames (and hence also beacons) must
1849 * be ignored here, because we need to trigger the timer during
1850 * data idle periods for sending the periodic probe request to the
1851 * AP we're connected to.
1852 */
1853 if (is_multicast_ether_addr(hdr->addr1))
1854 return;
1855
1856 ieee80211_sta_reset_conn_monitor(sdata);
1857 }
1858
1859 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1860 {
1861 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1862 struct ieee80211_local *local = sdata->local;
1863
1864 mutex_lock(&local->mtx);
1865 if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
1866 goto out;
1867
1868 __ieee80211_stop_poll(sdata);
1869
1870 mutex_lock(&local->iflist_mtx);
1871 ieee80211_recalc_ps(local, -1);
1872 mutex_unlock(&local->iflist_mtx);
1873
1874 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1875 goto out;
1876
1877 /*
1878 * We've received a probe response, but are not sure whether
1879 * we have or will be receiving any beacons or data, so let's
1880 * schedule the timers again, just in case.
1881 */
1882 ieee80211_sta_reset_beacon_monitor(sdata);
1883
1884 mod_timer(&ifmgd->conn_mon_timer,
1885 round_jiffies_up(jiffies +
1886 IEEE80211_CONNECTION_IDLE_TIME));
1887 out:
1888 mutex_unlock(&local->mtx);
1889 }
1890
1891 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1892 struct ieee80211_hdr *hdr, bool ack)
1893 {
1894 if (!ieee80211_is_data(hdr->frame_control))
1895 return;
1896
1897 if (ieee80211_is_nullfunc(hdr->frame_control) &&
1898 sdata->u.mgd.probe_send_count > 0) {
1899 if (ack)
1900 ieee80211_sta_reset_conn_monitor(sdata);
1901 else
1902 sdata->u.mgd.nullfunc_failed = true;
1903 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1904 return;
1905 }
1906
1907 if (ack)
1908 ieee80211_sta_reset_conn_monitor(sdata);
1909 }
1910
1911 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1912 {
1913 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1914 const u8 *ssid;
1915 u8 *dst = ifmgd->associated->bssid;
1916 u8 unicast_limit = max(1, max_probe_tries - 3);
1917
1918 /*
1919 * Try sending broadcast probe requests for the last three
1920 * probe requests after the first ones failed since some
1921 * buggy APs only support broadcast probe requests.
1922 */
1923 if (ifmgd->probe_send_count >= unicast_limit)
1924 dst = NULL;
1925
1926 /*
1927 * When the hardware reports an accurate Tx ACK status, it's
1928 * better to send a nullfunc frame instead of a probe request,
1929 * as it will kick us off the AP quickly if we aren't associated
1930 * anymore. The timeout will be reset if the frame is ACKed by
1931 * the AP.
1932 */
1933 ifmgd->probe_send_count++;
1934
1935 if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1936 ifmgd->nullfunc_failed = false;
1937 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1938 } else {
1939 int ssid_len;
1940
1941 rcu_read_lock();
1942 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1943 if (WARN_ON_ONCE(ssid == NULL))
1944 ssid_len = 0;
1945 else
1946 ssid_len = ssid[1];
1947
1948 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
1949 0, (u32) -1, true, 0,
1950 ifmgd->associated->channel, false);
1951 rcu_read_unlock();
1952 }
1953
1954 ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1955 run_again(sdata, ifmgd->probe_timeout);
1956 if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
1957 ieee80211_flush_queues(sdata->local, sdata);
1958 }
1959
1960 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1961 bool beacon)
1962 {
1963 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1964 bool already = false;
1965
1966 if (!ieee80211_sdata_running(sdata))
1967 return;
1968
1969 sdata_lock(sdata);
1970
1971 if (!ifmgd->associated)
1972 goto out;
1973
1974 mutex_lock(&sdata->local->mtx);
1975
1976 if (sdata->local->tmp_channel || sdata->local->scanning) {
1977 mutex_unlock(&sdata->local->mtx);
1978 goto out;
1979 }
1980
1981 if (beacon) {
1982 mlme_dbg_ratelimited(sdata,
1983 "detected beacon loss from AP (missed %d beacons) - probing\n",
1984 beacon_loss_count);
1985
1986 ieee80211_cqm_rssi_notify(&sdata->vif,
1987 NL80211_CQM_RSSI_BEACON_LOSS_EVENT,
1988 GFP_KERNEL);
1989 }
1990
1991 /*
1992 * The driver/our work has already reported this event or the
1993 * connection monitoring has kicked in and we have already sent
1994 * a probe request. Or maybe the AP died and the driver keeps
1995 * reporting until we disassociate...
1996 *
1997 * In either case we have to ignore the current call to this
1998 * function (except for setting the correct probe reason bit)
1999 * because otherwise we would reset the timer every time and
2000 * never check whether we received a probe response!
2001 */
2002 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
2003 already = true;
2004
2005 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2006
2007 mutex_unlock(&sdata->local->mtx);
2008
2009 if (already)
2010 goto out;
2011
2012 mutex_lock(&sdata->local->iflist_mtx);
2013 ieee80211_recalc_ps(sdata->local, -1);
2014 mutex_unlock(&sdata->local->iflist_mtx);
2015
2016 ifmgd->probe_send_count = 0;
2017 ieee80211_mgd_probe_ap_send(sdata);
2018 out:
2019 sdata_unlock(sdata);
2020 }
2021
2022 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2023 struct ieee80211_vif *vif)
2024 {
2025 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2026 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2027 struct cfg80211_bss *cbss;
2028 struct sk_buff *skb;
2029 const u8 *ssid;
2030 int ssid_len;
2031
2032 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2033 return NULL;
2034
2035 sdata_assert_lock(sdata);
2036
2037 if (ifmgd->associated)
2038 cbss = ifmgd->associated;
2039 else if (ifmgd->auth_data)
2040 cbss = ifmgd->auth_data->bss;
2041 else if (ifmgd->assoc_data)
2042 cbss = ifmgd->assoc_data->bss;
2043 else
2044 return NULL;
2045
2046 rcu_read_lock();
2047 ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2048 if (WARN_ON_ONCE(ssid == NULL))
2049 ssid_len = 0;
2050 else
2051 ssid_len = ssid[1];
2052
2053 skb = ieee80211_build_probe_req(sdata, cbss->bssid,
2054 (u32) -1, cbss->channel,
2055 ssid + 2, ssid_len,
2056 NULL, 0, true);
2057 rcu_read_unlock();
2058
2059 return skb;
2060 }
2061 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2062
2063 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2064 {
2065 struct ieee80211_local *local = sdata->local;
2066 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2067 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2068
2069 sdata_lock(sdata);
2070 if (!ifmgd->associated) {
2071 sdata_unlock(sdata);
2072 return;
2073 }
2074
2075 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2076 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2077 true, frame_buf);
2078 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
2079
2080 mutex_lock(&local->mtx);
2081 sdata->vif.csa_active = false;
2082 if (!ieee80211_csa_needs_block_tx(local))
2083 ieee80211_wake_queues_by_reason(&local->hw,
2084 IEEE80211_MAX_QUEUE_MAP,
2085 IEEE80211_QUEUE_STOP_REASON_CSA);
2086 mutex_unlock(&local->mtx);
2087
2088 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
2089 IEEE80211_DEAUTH_FRAME_LEN);
2090 sdata_unlock(sdata);
2091 }
2092
2093 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2094 {
2095 struct ieee80211_sub_if_data *sdata =
2096 container_of(work, struct ieee80211_sub_if_data,
2097 u.mgd.beacon_connection_loss_work);
2098 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2099 struct sta_info *sta;
2100
2101 if (ifmgd->associated) {
2102 rcu_read_lock();
2103 sta = sta_info_get(sdata, ifmgd->bssid);
2104 if (sta)
2105 sta->beacon_loss_count++;
2106 rcu_read_unlock();
2107 }
2108
2109 if (ifmgd->connection_loss) {
2110 sdata_info(sdata, "Connection to AP %pM lost\n",
2111 ifmgd->bssid);
2112 __ieee80211_disconnect(sdata);
2113 } else {
2114 ieee80211_mgd_probe_ap(sdata, true);
2115 }
2116 }
2117
2118 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2119 {
2120 struct ieee80211_sub_if_data *sdata =
2121 container_of(work, struct ieee80211_sub_if_data,
2122 u.mgd.csa_connection_drop_work);
2123
2124 __ieee80211_disconnect(sdata);
2125 }
2126
2127 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2128 {
2129 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2130 struct ieee80211_hw *hw = &sdata->local->hw;
2131
2132 trace_api_beacon_loss(sdata);
2133
2134 sdata->u.mgd.connection_loss = false;
2135 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2136 }
2137 EXPORT_SYMBOL(ieee80211_beacon_loss);
2138
2139 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2140 {
2141 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2142 struct ieee80211_hw *hw = &sdata->local->hw;
2143
2144 trace_api_connection_loss(sdata);
2145
2146 sdata->u.mgd.connection_loss = true;
2147 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2148 }
2149 EXPORT_SYMBOL(ieee80211_connection_loss);
2150
2151
2152 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2153 bool assoc)
2154 {
2155 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2156
2157 sdata_assert_lock(sdata);
2158
2159 if (!assoc) {
2160 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2161
2162 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2163 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2164 sdata->u.mgd.flags = 0;
2165 mutex_lock(&sdata->local->mtx);
2166 ieee80211_vif_release_channel(sdata);
2167 mutex_unlock(&sdata->local->mtx);
2168 }
2169
2170 cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2171 kfree(auth_data);
2172 sdata->u.mgd.auth_data = NULL;
2173 }
2174
2175 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2176 struct ieee80211_mgmt *mgmt, size_t len)
2177 {
2178 struct ieee80211_local *local = sdata->local;
2179 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2180 u8 *pos;
2181 struct ieee802_11_elems elems;
2182 u32 tx_flags = 0;
2183
2184 pos = mgmt->u.auth.variable;
2185 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2186 if (!elems.challenge)
2187 return;
2188 auth_data->expected_transaction = 4;
2189 drv_mgd_prepare_tx(sdata->local, sdata);
2190 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2191 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2192 IEEE80211_TX_INTFL_MLME_CONN_TX;
2193 ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2194 elems.challenge - 2, elems.challenge_len + 2,
2195 auth_data->bss->bssid, auth_data->bss->bssid,
2196 auth_data->key, auth_data->key_len,
2197 auth_data->key_idx, tx_flags);
2198 }
2199
2200 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2201 struct ieee80211_mgmt *mgmt, size_t len)
2202 {
2203 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2204 u8 bssid[ETH_ALEN];
2205 u16 auth_alg, auth_transaction, status_code;
2206 struct sta_info *sta;
2207
2208 sdata_assert_lock(sdata);
2209
2210 if (len < 24 + 6)
2211 return;
2212
2213 if (!ifmgd->auth_data || ifmgd->auth_data->done)
2214 return;
2215
2216 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2217
2218 if (!ether_addr_equal(bssid, mgmt->bssid))
2219 return;
2220
2221 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2222 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2223 status_code = le16_to_cpu(mgmt->u.auth.status_code);
2224
2225 if (auth_alg != ifmgd->auth_data->algorithm ||
2226 auth_transaction != ifmgd->auth_data->expected_transaction) {
2227 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2228 mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2229 auth_transaction,
2230 ifmgd->auth_data->expected_transaction);
2231 return;
2232 }
2233
2234 if (status_code != WLAN_STATUS_SUCCESS) {
2235 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2236 mgmt->sa, status_code);
2237 ieee80211_destroy_auth_data(sdata, false);
2238 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2239 return;
2240 }
2241
2242 switch (ifmgd->auth_data->algorithm) {
2243 case WLAN_AUTH_OPEN:
2244 case WLAN_AUTH_LEAP:
2245 case WLAN_AUTH_FT:
2246 case WLAN_AUTH_SAE:
2247 break;
2248 case WLAN_AUTH_SHARED_KEY:
2249 if (ifmgd->auth_data->expected_transaction != 4) {
2250 ieee80211_auth_challenge(sdata, mgmt, len);
2251 /* need another frame */
2252 return;
2253 }
2254 break;
2255 default:
2256 WARN_ONCE(1, "invalid auth alg %d",
2257 ifmgd->auth_data->algorithm);
2258 return;
2259 }
2260
2261 sdata_info(sdata, "authenticated\n");
2262 ifmgd->auth_data->done = true;
2263 ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2264 ifmgd->auth_data->timeout_started = true;
2265 run_again(sdata, ifmgd->auth_data->timeout);
2266
2267 if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2268 ifmgd->auth_data->expected_transaction != 2) {
2269 /*
2270 * Report auth frame to user space for processing since another
2271 * round of Authentication frames is still needed.
2272 */
2273 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2274 return;
2275 }
2276
2277 /* move station state to auth */
2278 mutex_lock(&sdata->local->sta_mtx);
2279 sta = sta_info_get(sdata, bssid);
2280 if (!sta) {
2281 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2282 goto out_err;
2283 }
2284 if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2285 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2286 goto out_err;
2287 }
2288 mutex_unlock(&sdata->local->sta_mtx);
2289
2290 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2291 return;
2292 out_err:
2293 mutex_unlock(&sdata->local->sta_mtx);
2294 /* ignore frame -- wait for timeout */
2295 }
2296
2297 #define case_WLAN(type) \
2298 case WLAN_REASON_##type: return #type
2299
2300 static const char *ieee80211_get_reason_code_string(u16 reason_code)
2301 {
2302 switch (reason_code) {
2303 case_WLAN(UNSPECIFIED);
2304 case_WLAN(PREV_AUTH_NOT_VALID);
2305 case_WLAN(DEAUTH_LEAVING);
2306 case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2307 case_WLAN(DISASSOC_AP_BUSY);
2308 case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2309 case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2310 case_WLAN(DISASSOC_STA_HAS_LEFT);
2311 case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2312 case_WLAN(DISASSOC_BAD_POWER);
2313 case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2314 case_WLAN(INVALID_IE);
2315 case_WLAN(MIC_FAILURE);
2316 case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2317 case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2318 case_WLAN(IE_DIFFERENT);
2319 case_WLAN(INVALID_GROUP_CIPHER);
2320 case_WLAN(INVALID_PAIRWISE_CIPHER);
2321 case_WLAN(INVALID_AKMP);
2322 case_WLAN(UNSUPP_RSN_VERSION);
2323 case_WLAN(INVALID_RSN_IE_CAP);
2324 case_WLAN(IEEE8021X_FAILED);
2325 case_WLAN(CIPHER_SUITE_REJECTED);
2326 case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2327 case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2328 case_WLAN(DISASSOC_LOW_ACK);
2329 case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2330 case_WLAN(QSTA_LEAVE_QBSS);
2331 case_WLAN(QSTA_NOT_USE);
2332 case_WLAN(QSTA_REQUIRE_SETUP);
2333 case_WLAN(QSTA_TIMEOUT);
2334 case_WLAN(QSTA_CIPHER_NOT_SUPP);
2335 case_WLAN(MESH_PEER_CANCELED);
2336 case_WLAN(MESH_MAX_PEERS);
2337 case_WLAN(MESH_CONFIG);
2338 case_WLAN(MESH_CLOSE);
2339 case_WLAN(MESH_MAX_RETRIES);
2340 case_WLAN(MESH_CONFIRM_TIMEOUT);
2341 case_WLAN(MESH_INVALID_GTK);
2342 case_WLAN(MESH_INCONSISTENT_PARAM);
2343 case_WLAN(MESH_INVALID_SECURITY);
2344 case_WLAN(MESH_PATH_ERROR);
2345 case_WLAN(MESH_PATH_NOFORWARD);
2346 case_WLAN(MESH_PATH_DEST_UNREACHABLE);
2347 case_WLAN(MAC_EXISTS_IN_MBSS);
2348 case_WLAN(MESH_CHAN_REGULATORY);
2349 case_WLAN(MESH_CHAN);
2350 default: return "<unknown>";
2351 }
2352 }
2353
2354 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2355 struct ieee80211_mgmt *mgmt, size_t len)
2356 {
2357 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2358 const u8 *bssid = NULL;
2359 u16 reason_code;
2360
2361 sdata_assert_lock(sdata);
2362
2363 if (len < 24 + 2)
2364 return;
2365
2366 if (!ifmgd->associated ||
2367 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2368 return;
2369
2370 bssid = ifmgd->associated->bssid;
2371
2372 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2373
2374 sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
2375 bssid, reason_code, ieee80211_get_reason_code_string(reason_code));
2376
2377 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2378
2379 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2380 }
2381
2382
2383 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2384 struct ieee80211_mgmt *mgmt, size_t len)
2385 {
2386 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2387 u16 reason_code;
2388
2389 sdata_assert_lock(sdata);
2390
2391 if (len < 24 + 2)
2392 return;
2393
2394 if (!ifmgd->associated ||
2395 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2396 return;
2397
2398 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2399
2400 sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2401 mgmt->sa, reason_code);
2402
2403 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2404
2405 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2406 }
2407
2408 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2409 u8 *supp_rates, unsigned int supp_rates_len,
2410 u32 *rates, u32 *basic_rates,
2411 bool *have_higher_than_11mbit,
2412 int *min_rate, int *min_rate_index,
2413 int shift, u32 rate_flags)
2414 {
2415 int i, j;
2416
2417 for (i = 0; i < supp_rates_len; i++) {
2418 int rate = supp_rates[i] & 0x7f;
2419 bool is_basic = !!(supp_rates[i] & 0x80);
2420
2421 if ((rate * 5 * (1 << shift)) > 110)
2422 *have_higher_than_11mbit = true;
2423
2424 /*
2425 * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2426 * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2427 *
2428 * Note: Even through the membership selector and the basic
2429 * rate flag share the same bit, they are not exactly
2430 * the same.
2431 */
2432 if (!!(supp_rates[i] & 0x80) &&
2433 (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2434 continue;
2435
2436 for (j = 0; j < sband->n_bitrates; j++) {
2437 struct ieee80211_rate *br;
2438 int brate;
2439
2440 br = &sband->bitrates[j];
2441 if ((rate_flags & br->flags) != rate_flags)
2442 continue;
2443
2444 brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2445 if (brate == rate) {
2446 *rates |= BIT(j);
2447 if (is_basic)
2448 *basic_rates |= BIT(j);
2449 if ((rate * 5) < *min_rate) {
2450 *min_rate = rate * 5;
2451 *min_rate_index = j;
2452 }
2453 break;
2454 }
2455 }
2456 }
2457 }
2458
2459 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2460 bool assoc)
2461 {
2462 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2463
2464 sdata_assert_lock(sdata);
2465
2466 if (!assoc) {
2467 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2468
2469 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2470 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2471 sdata->u.mgd.flags = 0;
2472 mutex_lock(&sdata->local->mtx);
2473 ieee80211_vif_release_channel(sdata);
2474 mutex_unlock(&sdata->local->mtx);
2475 }
2476
2477 kfree(assoc_data);
2478 sdata->u.mgd.assoc_data = NULL;
2479 }
2480
2481 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2482 struct cfg80211_bss *cbss,
2483 struct ieee80211_mgmt *mgmt, size_t len)
2484 {
2485 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2486 struct ieee80211_local *local = sdata->local;
2487 struct ieee80211_supported_band *sband;
2488 struct sta_info *sta;
2489 u8 *pos;
2490 u16 capab_info, aid;
2491 struct ieee802_11_elems elems;
2492 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2493 const struct cfg80211_bss_ies *bss_ies = NULL;
2494 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2495 u32 changed = 0;
2496 int err;
2497 bool ret;
2498
2499 /* AssocResp and ReassocResp have identical structure */
2500
2501 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2502 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2503
2504 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2505 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2506 aid);
2507 aid &= ~(BIT(15) | BIT(14));
2508
2509 ifmgd->broken_ap = false;
2510
2511 if (aid == 0 || aid > IEEE80211_MAX_AID) {
2512 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2513 aid);
2514 aid = 0;
2515 ifmgd->broken_ap = true;
2516 }
2517
2518 pos = mgmt->u.assoc_resp.variable;
2519 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2520
2521 if (!elems.supp_rates) {
2522 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2523 return false;
2524 }
2525
2526 ifmgd->aid = aid;
2527
2528 /*
2529 * Some APs are erroneously not including some information in their
2530 * (re)association response frames. Try to recover by using the data
2531 * from the beacon or probe response. This seems to afflict mobile
2532 * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2533 * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2534 */
2535 if ((assoc_data->wmm && !elems.wmm_param) ||
2536 (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2537 (!elems.ht_cap_elem || !elems.ht_operation)) ||
2538 (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2539 (!elems.vht_cap_elem || !elems.vht_operation))) {
2540 const struct cfg80211_bss_ies *ies;
2541 struct ieee802_11_elems bss_elems;
2542
2543 rcu_read_lock();
2544 ies = rcu_dereference(cbss->ies);
2545 if (ies)
2546 bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2547 GFP_ATOMIC);
2548 rcu_read_unlock();
2549 if (!bss_ies)
2550 return false;
2551
2552 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2553 false, &bss_elems);
2554 if (assoc_data->wmm &&
2555 !elems.wmm_param && bss_elems.wmm_param) {
2556 elems.wmm_param = bss_elems.wmm_param;
2557 sdata_info(sdata,
2558 "AP bug: WMM param missing from AssocResp\n");
2559 }
2560
2561 /*
2562 * Also check if we requested HT/VHT, otherwise the AP doesn't
2563 * have to include the IEs in the (re)association response.
2564 */
2565 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2566 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2567 elems.ht_cap_elem = bss_elems.ht_cap_elem;
2568 sdata_info(sdata,
2569 "AP bug: HT capability missing from AssocResp\n");
2570 }
2571 if (!elems.ht_operation && bss_elems.ht_operation &&
2572 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2573 elems.ht_operation = bss_elems.ht_operation;
2574 sdata_info(sdata,
2575 "AP bug: HT operation missing from AssocResp\n");
2576 }
2577 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2578 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2579 elems.vht_cap_elem = bss_elems.vht_cap_elem;
2580 sdata_info(sdata,
2581 "AP bug: VHT capa missing from AssocResp\n");
2582 }
2583 if (!elems.vht_operation && bss_elems.vht_operation &&
2584 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2585 elems.vht_operation = bss_elems.vht_operation;
2586 sdata_info(sdata,
2587 "AP bug: VHT operation missing from AssocResp\n");
2588 }
2589 }
2590
2591 /*
2592 * We previously checked these in the beacon/probe response, so
2593 * they should be present here. This is just a safety net.
2594 */
2595 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2596 (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2597 sdata_info(sdata,
2598 "HT AP is missing WMM params or HT capability/operation\n");
2599 ret = false;
2600 goto out;
2601 }
2602
2603 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2604 (!elems.vht_cap_elem || !elems.vht_operation)) {
2605 sdata_info(sdata,
2606 "VHT AP is missing VHT capability/operation\n");
2607 ret = false;
2608 goto out;
2609 }
2610
2611 mutex_lock(&sdata->local->sta_mtx);
2612 /*
2613 * station info was already allocated and inserted before
2614 * the association and should be available to us
2615 */
2616 sta = sta_info_get(sdata, cbss->bssid);
2617 if (WARN_ON(!sta)) {
2618 mutex_unlock(&sdata->local->sta_mtx);
2619 ret = false;
2620 goto out;
2621 }
2622
2623 sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2624
2625 /* Set up internal HT/VHT capabilities */
2626 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2627 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2628 elems.ht_cap_elem, sta);
2629
2630 if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
2631 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2632 elems.vht_cap_elem, sta);
2633
2634 /*
2635 * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
2636 * in their association response, so ignore that data for our own
2637 * configuration. If it changed since the last beacon, we'll get the
2638 * next beacon and update then.
2639 */
2640
2641 /*
2642 * If an operating mode notification IE is present, override the
2643 * NSS calculation (that would be done in rate_control_rate_init())
2644 * and use the # of streams from that element.
2645 */
2646 if (elems.opmode_notif &&
2647 !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
2648 u8 nss;
2649
2650 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
2651 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
2652 nss += 1;
2653 sta->sta.rx_nss = nss;
2654 }
2655
2656 rate_control_rate_init(sta);
2657
2658 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2659 set_sta_flag(sta, WLAN_STA_MFP);
2660
2661 if (elems.wmm_param)
2662 set_sta_flag(sta, WLAN_STA_WME);
2663
2664 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2665 if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2666 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2667 if (err) {
2668 sdata_info(sdata,
2669 "failed to move station %pM to desired state\n",
2670 sta->sta.addr);
2671 WARN_ON(__sta_info_destroy(sta));
2672 mutex_unlock(&sdata->local->sta_mtx);
2673 ret = false;
2674 goto out;
2675 }
2676
2677 mutex_unlock(&sdata->local->sta_mtx);
2678
2679 /*
2680 * Always handle WMM once after association regardless
2681 * of the first value the AP uses. Setting -1 here has
2682 * that effect because the AP values is an unsigned
2683 * 4-bit value.
2684 */
2685 ifmgd->wmm_last_param_set = -1;
2686
2687 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && elems.wmm_param)
2688 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2689 elems.wmm_param_len);
2690 else
2691 ieee80211_set_wmm_default(sdata, false);
2692 changed |= BSS_CHANGED_QOS;
2693
2694 /* set AID and assoc capability,
2695 * ieee80211_set_associated() will tell the driver */
2696 bss_conf->aid = aid;
2697 bss_conf->assoc_capability = capab_info;
2698 ieee80211_set_associated(sdata, cbss, changed);
2699
2700 /*
2701 * If we're using 4-addr mode, let the AP know that we're
2702 * doing so, so that it can create the STA VLAN on its side
2703 */
2704 if (ifmgd->use_4addr)
2705 ieee80211_send_4addr_nullfunc(local, sdata);
2706
2707 /*
2708 * Start timer to probe the connection to the AP now.
2709 * Also start the timer that will detect beacon loss.
2710 */
2711 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2712 ieee80211_sta_reset_beacon_monitor(sdata);
2713
2714 ret = true;
2715 out:
2716 kfree(bss_ies);
2717 return ret;
2718 }
2719
2720 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2721 struct ieee80211_mgmt *mgmt,
2722 size_t len)
2723 {
2724 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2725 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2726 u16 capab_info, status_code, aid;
2727 struct ieee802_11_elems elems;
2728 u8 *pos;
2729 bool reassoc;
2730 struct cfg80211_bss *bss;
2731
2732 sdata_assert_lock(sdata);
2733
2734 if (!assoc_data)
2735 return;
2736 if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2737 return;
2738
2739 /*
2740 * AssocResp and ReassocResp have identical structure, so process both
2741 * of them in this function.
2742 */
2743
2744 if (len < 24 + 6)
2745 return;
2746
2747 reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2748 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2749 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2750 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2751
2752 sdata_info(sdata,
2753 "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
2754 reassoc ? "Rea" : "A", mgmt->sa,
2755 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2756
2757 pos = mgmt->u.assoc_resp.variable;
2758 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2759
2760 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2761 elems.timeout_int &&
2762 elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2763 u32 tu, ms;
2764 tu = le32_to_cpu(elems.timeout_int->value);
2765 ms = tu * 1024 / 1000;
2766 sdata_info(sdata,
2767 "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
2768 mgmt->sa, tu, ms);
2769 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2770 assoc_data->timeout_started = true;
2771 if (ms > IEEE80211_ASSOC_TIMEOUT)
2772 run_again(sdata, assoc_data->timeout);
2773 return;
2774 }
2775
2776 bss = assoc_data->bss;
2777
2778 if (status_code != WLAN_STATUS_SUCCESS) {
2779 sdata_info(sdata, "%pM denied association (code=%d)\n",
2780 mgmt->sa, status_code);
2781 ieee80211_destroy_assoc_data(sdata, false);
2782 } else {
2783 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
2784 /* oops -- internal error -- send timeout for now */
2785 ieee80211_destroy_assoc_data(sdata, false);
2786 cfg80211_assoc_timeout(sdata->dev, bss);
2787 return;
2788 }
2789 sdata_info(sdata, "associated\n");
2790
2791 /*
2792 * destroy assoc_data afterwards, as otherwise an idle
2793 * recalc after assoc_data is NULL but before associated
2794 * is set can cause the interface to go idle
2795 */
2796 ieee80211_destroy_assoc_data(sdata, true);
2797 }
2798
2799 cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len);
2800 }
2801
2802 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2803 struct ieee80211_mgmt *mgmt, size_t len,
2804 struct ieee80211_rx_status *rx_status,
2805 struct ieee802_11_elems *elems)
2806 {
2807 struct ieee80211_local *local = sdata->local;
2808 struct ieee80211_bss *bss;
2809 struct ieee80211_channel *channel;
2810
2811 sdata_assert_lock(sdata);
2812
2813 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
2814 if (!channel)
2815 return;
2816
2817 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2818 channel);
2819 if (bss) {
2820 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
2821 ieee80211_rx_bss_put(local, bss);
2822 }
2823 }
2824
2825
2826 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2827 struct sk_buff *skb)
2828 {
2829 struct ieee80211_mgmt *mgmt = (void *)skb->data;
2830 struct ieee80211_if_managed *ifmgd;
2831 struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2832 size_t baselen, len = skb->len;
2833 struct ieee802_11_elems elems;
2834
2835 ifmgd = &sdata->u.mgd;
2836
2837 sdata_assert_lock(sdata);
2838
2839 if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2840 return; /* ignore ProbeResp to foreign address */
2841
2842 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2843 if (baselen > len)
2844 return;
2845
2846 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2847 false, &elems);
2848
2849 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2850
2851 if (ifmgd->associated &&
2852 ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2853 ieee80211_reset_ap_probe(sdata);
2854
2855 if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2856 ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
2857 /* got probe response, continue with auth */
2858 sdata_info(sdata, "direct probe responded\n");
2859 ifmgd->auth_data->tries = 0;
2860 ifmgd->auth_data->timeout = jiffies;
2861 ifmgd->auth_data->timeout_started = true;
2862 run_again(sdata, ifmgd->auth_data->timeout);
2863 }
2864 }
2865
2866 /*
2867 * This is the canonical list of information elements we care about,
2868 * the filter code also gives us all changes to the Microsoft OUI
2869 * (00:50:F2) vendor IE which is used for WMM which we need to track.
2870 *
2871 * We implement beacon filtering in software since that means we can
2872 * avoid processing the frame here and in cfg80211, and userspace
2873 * will not be able to tell whether the hardware supports it or not.
2874 *
2875 * XXX: This list needs to be dynamic -- userspace needs to be able to
2876 * add items it requires. It also needs to be able to tell us to
2877 * look out for other vendor IEs.
2878 */
2879 static const u64 care_about_ies =
2880 (1ULL << WLAN_EID_COUNTRY) |
2881 (1ULL << WLAN_EID_ERP_INFO) |
2882 (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2883 (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2884 (1ULL << WLAN_EID_HT_CAPABILITY) |
2885 (1ULL << WLAN_EID_HT_OPERATION);
2886
2887 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2888 struct ieee80211_mgmt *mgmt, size_t len,
2889 struct ieee80211_rx_status *rx_status)
2890 {
2891 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2892 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2893 size_t baselen;
2894 struct ieee802_11_elems elems;
2895 struct ieee80211_local *local = sdata->local;
2896 struct ieee80211_chanctx_conf *chanctx_conf;
2897 struct ieee80211_channel *chan;
2898 struct sta_info *sta;
2899 u32 changed = 0;
2900 bool erp_valid;
2901 u8 erp_value = 0;
2902 u32 ncrc;
2903 u8 *bssid;
2904 u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
2905
2906 sdata_assert_lock(sdata);
2907
2908 /* Process beacon from the current BSS */
2909 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2910 if (baselen > len)
2911 return;
2912
2913 rcu_read_lock();
2914 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2915 if (!chanctx_conf) {
2916 rcu_read_unlock();
2917 return;
2918 }
2919
2920 if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
2921 rcu_read_unlock();
2922 return;
2923 }
2924 chan = chanctx_conf->def.chan;
2925 rcu_read_unlock();
2926
2927 if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
2928 ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2929 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2930 len - baselen, false, &elems);
2931
2932 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2933 if (elems.tim && !elems.parse_error) {
2934 const struct ieee80211_tim_ie *tim_ie = elems.tim;
2935 ifmgd->dtim_period = tim_ie->dtim_period;
2936 }
2937 ifmgd->have_beacon = true;
2938 ifmgd->assoc_data->need_beacon = false;
2939 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
2940 sdata->vif.bss_conf.sync_tsf =
2941 le64_to_cpu(mgmt->u.beacon.timestamp);
2942 sdata->vif.bss_conf.sync_device_ts =
2943 rx_status->device_timestamp;
2944 if (elems.tim)
2945 sdata->vif.bss_conf.sync_dtim_count =
2946 elems.tim->dtim_count;
2947 else
2948 sdata->vif.bss_conf.sync_dtim_count = 0;
2949 }
2950 /* continue assoc process */
2951 ifmgd->assoc_data->timeout = jiffies;
2952 ifmgd->assoc_data->timeout_started = true;
2953 run_again(sdata, ifmgd->assoc_data->timeout);
2954 return;
2955 }
2956
2957 if (!ifmgd->associated ||
2958 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2959 return;
2960 bssid = ifmgd->associated->bssid;
2961
2962 /* Track average RSSI from the Beacon frames of the current AP */
2963 ifmgd->last_beacon_signal = rx_status->signal;
2964 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2965 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2966 ifmgd->ave_beacon_signal = rx_status->signal * 16;
2967 ifmgd->last_cqm_event_signal = 0;
2968 ifmgd->count_beacon_signal = 1;
2969 ifmgd->last_ave_beacon_signal = 0;
2970 } else {
2971 ifmgd->ave_beacon_signal =
2972 (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
2973 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
2974 ifmgd->ave_beacon_signal) / 16;
2975 ifmgd->count_beacon_signal++;
2976 }
2977
2978 if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
2979 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
2980 int sig = ifmgd->ave_beacon_signal;
2981 int last_sig = ifmgd->last_ave_beacon_signal;
2982
2983 /*
2984 * if signal crosses either of the boundaries, invoke callback
2985 * with appropriate parameters
2986 */
2987 if (sig > ifmgd->rssi_max_thold &&
2988 (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
2989 ifmgd->last_ave_beacon_signal = sig;
2990 drv_rssi_callback(local, sdata, RSSI_EVENT_HIGH);
2991 } else if (sig < ifmgd->rssi_min_thold &&
2992 (last_sig >= ifmgd->rssi_max_thold ||
2993 last_sig == 0)) {
2994 ifmgd->last_ave_beacon_signal = sig;
2995 drv_rssi_callback(local, sdata, RSSI_EVENT_LOW);
2996 }
2997 }
2998
2999 if (bss_conf->cqm_rssi_thold &&
3000 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3001 !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3002 int sig = ifmgd->ave_beacon_signal / 16;
3003 int last_event = ifmgd->last_cqm_event_signal;
3004 int thold = bss_conf->cqm_rssi_thold;
3005 int hyst = bss_conf->cqm_rssi_hyst;
3006 if (sig < thold &&
3007 (last_event == 0 || sig < last_event - hyst)) {
3008 ifmgd->last_cqm_event_signal = sig;
3009 ieee80211_cqm_rssi_notify(
3010 &sdata->vif,
3011 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3012 GFP_KERNEL);
3013 } else if (sig > thold &&
3014 (last_event == 0 || sig > last_event + hyst)) {
3015 ifmgd->last_cqm_event_signal = sig;
3016 ieee80211_cqm_rssi_notify(
3017 &sdata->vif,
3018 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3019 GFP_KERNEL);
3020 }
3021 }
3022
3023 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3024 mlme_dbg_ratelimited(sdata,
3025 "cancelling AP probe due to a received beacon\n");
3026 ieee80211_reset_ap_probe(sdata);
3027 }
3028
3029 /*
3030 * Push the beacon loss detection into the future since
3031 * we are processing a beacon from the AP just now.
3032 */
3033 ieee80211_sta_reset_beacon_monitor(sdata);
3034
3035 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3036 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3037 len - baselen, false, &elems,
3038 care_about_ies, ncrc);
3039
3040 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
3041 bool directed_tim = ieee80211_check_tim(elems.tim,
3042 elems.tim_len,
3043 ifmgd->aid);
3044 if (directed_tim) {
3045 if (local->hw.conf.dynamic_ps_timeout > 0) {
3046 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3047 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3048 ieee80211_hw_config(local,
3049 IEEE80211_CONF_CHANGE_PS);
3050 }
3051 ieee80211_send_nullfunc(local, sdata, 0);
3052 } else if (!local->pspolling && sdata->u.mgd.powersave) {
3053 local->pspolling = true;
3054
3055 /*
3056 * Here is assumed that the driver will be
3057 * able to send ps-poll frame and receive a
3058 * response even though power save mode is
3059 * enabled, but some drivers might require
3060 * to disable power save here. This needs
3061 * to be investigated.
3062 */
3063 ieee80211_send_pspoll(local, sdata);
3064 }
3065 }
3066 }
3067
3068 if (sdata->vif.p2p) {
3069 struct ieee80211_p2p_noa_attr noa = {};
3070 int ret;
3071
3072 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3073 len - baselen,
3074 IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3075 (u8 *) &noa, sizeof(noa));
3076 if (ret >= 2) {
3077 if (sdata->u.mgd.p2p_noa_index != noa.index) {
3078 /* valid noa_attr and index changed */
3079 sdata->u.mgd.p2p_noa_index = noa.index;
3080 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3081 changed |= BSS_CHANGED_P2P_PS;
3082 /*
3083 * make sure we update all information, the CRC
3084 * mechanism doesn't look at P2P attributes.
3085 */
3086 ifmgd->beacon_crc_valid = false;
3087 }
3088 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3089 /* noa_attr not found and we had valid noa_attr before */
3090 sdata->u.mgd.p2p_noa_index = -1;
3091 memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3092 changed |= BSS_CHANGED_P2P_PS;
3093 ifmgd->beacon_crc_valid = false;
3094 }
3095 }
3096
3097 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3098 return;
3099 ifmgd->beacon_crc = ncrc;
3100 ifmgd->beacon_crc_valid = true;
3101
3102 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3103
3104 ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3105 &elems, true);
3106
3107 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3108 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3109 elems.wmm_param_len))
3110 changed |= BSS_CHANGED_QOS;
3111
3112 /*
3113 * If we haven't had a beacon before, tell the driver about the
3114 * DTIM period (and beacon timing if desired) now.
3115 */
3116 if (!ifmgd->have_beacon) {
3117 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3118 if (elems.tim)
3119 bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3120 else
3121 bss_conf->dtim_period = 1;
3122
3123 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
3124 sdata->vif.bss_conf.sync_tsf =
3125 le64_to_cpu(mgmt->u.beacon.timestamp);
3126 sdata->vif.bss_conf.sync_device_ts =
3127 rx_status->device_timestamp;
3128 if (elems.tim)
3129 sdata->vif.bss_conf.sync_dtim_count =
3130 elems.tim->dtim_count;
3131 else
3132 sdata->vif.bss_conf.sync_dtim_count = 0;
3133 }
3134
3135 changed |= BSS_CHANGED_BEACON_INFO;
3136 ifmgd->have_beacon = true;
3137
3138 mutex_lock(&local->iflist_mtx);
3139 ieee80211_recalc_ps(local, -1);
3140 mutex_unlock(&local->iflist_mtx);
3141
3142 ieee80211_recalc_ps_vif(sdata);
3143 }
3144
3145 if (elems.erp_info) {
3146 erp_valid = true;
3147 erp_value = elems.erp_info[0];
3148 } else {
3149 erp_valid = false;
3150 }
3151 changed |= ieee80211_handle_bss_capability(sdata,
3152 le16_to_cpu(mgmt->u.beacon.capab_info),
3153 erp_valid, erp_value);
3154
3155 mutex_lock(&local->sta_mtx);
3156 sta = sta_info_get(sdata, bssid);
3157
3158 if (ieee80211_config_bw(sdata, sta, elems.ht_operation,
3159 elems.vht_operation, bssid, &changed)) {
3160 mutex_unlock(&local->sta_mtx);
3161 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3162 WLAN_REASON_DEAUTH_LEAVING,
3163 true, deauth_buf);
3164 cfg80211_tx_mlme_mgmt(sdata->dev, deauth_buf,
3165 sizeof(deauth_buf));
3166 return;
3167 }
3168
3169 if (sta && elems.opmode_notif)
3170 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3171 rx_status->band, true);
3172 mutex_unlock(&local->sta_mtx);
3173
3174 if (elems.country_elem && elems.pwr_constr_elem &&
3175 mgmt->u.probe_resp.capab_info &
3176 cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT))
3177 changed |= ieee80211_handle_pwr_constr(sdata, chan,
3178 elems.country_elem,
3179 elems.country_elem_len,
3180 elems.pwr_constr_elem);
3181
3182 ieee80211_bss_info_change_notify(sdata, changed);
3183 }
3184
3185 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3186 struct sk_buff *skb)
3187 {
3188 struct ieee80211_rx_status *rx_status;
3189 struct ieee80211_mgmt *mgmt;
3190 u16 fc;
3191 struct ieee802_11_elems elems;
3192 int ies_len;
3193
3194 rx_status = (struct ieee80211_rx_status *) skb->cb;
3195 mgmt = (struct ieee80211_mgmt *) skb->data;
3196 fc = le16_to_cpu(mgmt->frame_control);
3197
3198 sdata_lock(sdata);
3199
3200 switch (fc & IEEE80211_FCTL_STYPE) {
3201 case IEEE80211_STYPE_BEACON:
3202 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3203 break;
3204 case IEEE80211_STYPE_PROBE_RESP:
3205 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3206 break;
3207 case IEEE80211_STYPE_AUTH:
3208 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3209 break;
3210 case IEEE80211_STYPE_DEAUTH:
3211 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3212 break;
3213 case IEEE80211_STYPE_DISASSOC:
3214 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3215 break;
3216 case IEEE80211_STYPE_ASSOC_RESP:
3217 case IEEE80211_STYPE_REASSOC_RESP:
3218 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3219 break;
3220 case IEEE80211_STYPE_ACTION:
3221 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3222 ies_len = skb->len -
3223 offsetof(struct ieee80211_mgmt,
3224 u.action.u.chan_switch.variable);
3225
3226 if (ies_len < 0)
3227 break;
3228
3229 ieee802_11_parse_elems(
3230 mgmt->u.action.u.chan_switch.variable,
3231 ies_len, true, &elems);
3232
3233 if (elems.parse_error)
3234 break;
3235
3236 ieee80211_sta_process_chanswitch(sdata,
3237 rx_status->mactime,
3238 &elems, false);
3239 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3240 ies_len = skb->len -
3241 offsetof(struct ieee80211_mgmt,
3242 u.action.u.ext_chan_switch.variable);
3243
3244 if (ies_len < 0)
3245 break;
3246
3247 ieee802_11_parse_elems(
3248 mgmt->u.action.u.ext_chan_switch.variable,
3249 ies_len, true, &elems);
3250
3251 if (elems.parse_error)
3252 break;
3253
3254 /* for the handling code pretend this was also an IE */
3255 elems.ext_chansw_ie =
3256 &mgmt->u.action.u.ext_chan_switch.data;
3257
3258 ieee80211_sta_process_chanswitch(sdata,
3259 rx_status->mactime,
3260 &elems, false);
3261 }
3262 break;
3263 }
3264 sdata_unlock(sdata);
3265 }
3266
3267 static void ieee80211_sta_timer(unsigned long data)
3268 {
3269 struct ieee80211_sub_if_data *sdata =
3270 (struct ieee80211_sub_if_data *) data;
3271
3272 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3273 }
3274
3275 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3276 u8 *bssid, u8 reason, bool tx)
3277 {
3278 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3279
3280 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3281 tx, frame_buf);
3282
3283 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
3284 IEEE80211_DEAUTH_FRAME_LEN);
3285 }
3286
3287 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
3288 {
3289 struct ieee80211_local *local = sdata->local;
3290 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3291 struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3292 u32 tx_flags = 0;
3293
3294 sdata_assert_lock(sdata);
3295
3296 if (WARN_ON_ONCE(!auth_data))
3297 return -EINVAL;
3298
3299 auth_data->tries++;
3300
3301 if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3302 sdata_info(sdata, "authentication with %pM timed out\n",
3303 auth_data->bss->bssid);
3304
3305 /*
3306 * Most likely AP is not in the range so remove the
3307 * bss struct for that AP.
3308 */
3309 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3310
3311 return -ETIMEDOUT;
3312 }
3313
3314 drv_mgd_prepare_tx(local, sdata);
3315
3316 if (auth_data->bss->proberesp_ies) {
3317 u16 trans = 1;
3318 u16 status = 0;
3319
3320 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3321 auth_data->bss->bssid, auth_data->tries,
3322 IEEE80211_AUTH_MAX_TRIES);
3323
3324 auth_data->expected_transaction = 2;
3325
3326 if (auth_data->algorithm == WLAN_AUTH_SAE) {
3327 trans = auth_data->sae_trans;
3328 status = auth_data->sae_status;
3329 auth_data->expected_transaction = trans;
3330 }
3331
3332 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3333 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3334 IEEE80211_TX_INTFL_MLME_CONN_TX;
3335
3336 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3337 auth_data->data, auth_data->data_len,
3338 auth_data->bss->bssid,
3339 auth_data->bss->bssid, NULL, 0, 0,
3340 tx_flags);
3341 } else {
3342 const u8 *ssidie;
3343
3344 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
3345 auth_data->bss->bssid, auth_data->tries,
3346 IEEE80211_AUTH_MAX_TRIES);
3347
3348 rcu_read_lock();
3349 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
3350 if (!ssidie) {
3351 rcu_read_unlock();
3352 return -EINVAL;
3353 }
3354 /*
3355 * Direct probe is sent to broadcast address as some APs
3356 * will not answer to direct packet in unassociated state.
3357 */
3358 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
3359 NULL, 0, (u32) -1, true, 0,
3360 auth_data->bss->channel, false);
3361 rcu_read_unlock();
3362 }
3363
3364 if (tx_flags == 0) {
3365 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3366 auth_data->timeout_started = true;
3367 run_again(sdata, auth_data->timeout);
3368 } else {
3369 auth_data->timeout =
3370 round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3371 auth_data->timeout_started = true;
3372 run_again(sdata, auth_data->timeout);
3373 }
3374
3375 return 0;
3376 }
3377
3378 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3379 {
3380 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3381 struct ieee80211_local *local = sdata->local;
3382
3383 sdata_assert_lock(sdata);
3384
3385 assoc_data->tries++;
3386 if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3387 sdata_info(sdata, "association with %pM timed out\n",
3388 assoc_data->bss->bssid);
3389
3390 /*
3391 * Most likely AP is not in the range so remove the
3392 * bss struct for that AP.
3393 */
3394 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3395
3396 return -ETIMEDOUT;
3397 }
3398
3399 sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3400 assoc_data->bss->bssid, assoc_data->tries,
3401 IEEE80211_ASSOC_MAX_TRIES);
3402 ieee80211_send_assoc(sdata);
3403
3404 if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
3405 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3406 assoc_data->timeout_started = true;
3407 run_again(sdata, assoc_data->timeout);
3408 } else {
3409 assoc_data->timeout =
3410 round_jiffies_up(jiffies +
3411 IEEE80211_ASSOC_TIMEOUT_LONG);
3412 assoc_data->timeout_started = true;
3413 run_again(sdata, assoc_data->timeout);
3414 }
3415
3416 return 0;
3417 }
3418
3419 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3420 __le16 fc, bool acked)
3421 {
3422 struct ieee80211_local *local = sdata->local;
3423
3424 sdata->u.mgd.status_fc = fc;
3425 sdata->u.mgd.status_acked = acked;
3426 sdata->u.mgd.status_received = true;
3427
3428 ieee80211_queue_work(&local->hw, &sdata->work);
3429 }
3430
3431 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3432 {
3433 struct ieee80211_local *local = sdata->local;
3434 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3435
3436 sdata_lock(sdata);
3437
3438 if (ifmgd->status_received) {
3439 __le16 fc = ifmgd->status_fc;
3440 bool status_acked = ifmgd->status_acked;
3441
3442 ifmgd->status_received = false;
3443 if (ifmgd->auth_data &&
3444 (ieee80211_is_probe_req(fc) || ieee80211_is_auth(fc))) {
3445 if (status_acked) {
3446 ifmgd->auth_data->timeout =
3447 jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3448 run_again(sdata, ifmgd->auth_data->timeout);
3449 } else {
3450 ifmgd->auth_data->timeout = jiffies - 1;
3451 }
3452 ifmgd->auth_data->timeout_started = true;
3453 } else if (ifmgd->assoc_data &&
3454 (ieee80211_is_assoc_req(fc) ||
3455 ieee80211_is_reassoc_req(fc))) {
3456 if (status_acked) {
3457 ifmgd->assoc_data->timeout =
3458 jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3459 run_again(sdata, ifmgd->assoc_data->timeout);
3460 } else {
3461 ifmgd->assoc_data->timeout = jiffies - 1;
3462 }
3463 ifmgd->assoc_data->timeout_started = true;
3464 }
3465 }
3466
3467 if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3468 time_after(jiffies, ifmgd->auth_data->timeout)) {
3469 if (ifmgd->auth_data->done) {
3470 /*
3471 * ok ... we waited for assoc but userspace didn't,
3472 * so let's just kill the auth data
3473 */
3474 ieee80211_destroy_auth_data(sdata, false);
3475 } else if (ieee80211_probe_auth(sdata)) {
3476 u8 bssid[ETH_ALEN];
3477
3478 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3479
3480 ieee80211_destroy_auth_data(sdata, false);
3481
3482 cfg80211_auth_timeout(sdata->dev, bssid);
3483 }
3484 } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3485 run_again(sdata, ifmgd->auth_data->timeout);
3486
3487 if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3488 time_after(jiffies, ifmgd->assoc_data->timeout)) {
3489 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3490 ieee80211_do_assoc(sdata)) {
3491 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3492
3493 ieee80211_destroy_assoc_data(sdata, false);
3494 cfg80211_assoc_timeout(sdata->dev, bss);
3495 }
3496 } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3497 run_again(sdata, ifmgd->assoc_data->timeout);
3498
3499 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3500 ifmgd->associated) {
3501 u8 bssid[ETH_ALEN];
3502 int max_tries;
3503
3504 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3505
3506 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3507 max_tries = max_nullfunc_tries;
3508 else
3509 max_tries = max_probe_tries;
3510
3511 /* ACK received for nullfunc probing frame */
3512 if (!ifmgd->probe_send_count)
3513 ieee80211_reset_ap_probe(sdata);
3514 else if (ifmgd->nullfunc_failed) {
3515 if (ifmgd->probe_send_count < max_tries) {
3516 mlme_dbg(sdata,
3517 "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3518 bssid, ifmgd->probe_send_count,
3519 max_tries);
3520 ieee80211_mgd_probe_ap_send(sdata);
3521 } else {
3522 mlme_dbg(sdata,
3523 "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3524 bssid);
3525 ieee80211_sta_connection_lost(sdata, bssid,
3526 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3527 false);
3528 }
3529 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3530 run_again(sdata, ifmgd->probe_timeout);
3531 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
3532 mlme_dbg(sdata,
3533 "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3534 bssid, probe_wait_ms);
3535 ieee80211_sta_connection_lost(sdata, bssid,
3536 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3537 } else if (ifmgd->probe_send_count < max_tries) {
3538 mlme_dbg(sdata,
3539 "No probe response from AP %pM after %dms, try %d/%i\n",
3540 bssid, probe_wait_ms,
3541 ifmgd->probe_send_count, max_tries);
3542 ieee80211_mgd_probe_ap_send(sdata);
3543 } else {
3544 /*
3545 * We actually lost the connection ... or did we?
3546 * Let's make sure!
3547 */
3548 wiphy_debug(local->hw.wiphy,
3549 "%s: No probe response from AP %pM"
3550 " after %dms, disconnecting.\n",
3551 sdata->name,
3552 bssid, probe_wait_ms);
3553
3554 ieee80211_sta_connection_lost(sdata, bssid,
3555 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3556 }
3557 }
3558
3559 sdata_unlock(sdata);
3560 }
3561
3562 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3563 {
3564 struct ieee80211_sub_if_data *sdata =
3565 (struct ieee80211_sub_if_data *) data;
3566 struct ieee80211_local *local = sdata->local;
3567
3568 if (local->quiescing)
3569 return;
3570
3571 if (sdata->vif.csa_active)
3572 return;
3573
3574 sdata->u.mgd.connection_loss = false;
3575 ieee80211_queue_work(&sdata->local->hw,
3576 &sdata->u.mgd.beacon_connection_loss_work);
3577 }
3578
3579 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3580 {
3581 struct ieee80211_sub_if_data *sdata =
3582 (struct ieee80211_sub_if_data *) data;
3583 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3584 struct ieee80211_local *local = sdata->local;
3585
3586 if (local->quiescing)
3587 return;
3588
3589 if (sdata->vif.csa_active)
3590 return;
3591
3592 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3593 }
3594
3595 static void ieee80211_sta_monitor_work(struct work_struct *work)
3596 {
3597 struct ieee80211_sub_if_data *sdata =
3598 container_of(work, struct ieee80211_sub_if_data,
3599 u.mgd.monitor_work);
3600
3601 ieee80211_mgd_probe_ap(sdata, false);
3602 }
3603
3604 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3605 {
3606 u32 flags;
3607
3608 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3609 __ieee80211_stop_poll(sdata);
3610
3611 /* let's probe the connection once */
3612 flags = sdata->local->hw.flags;
3613 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
3614 ieee80211_queue_work(&sdata->local->hw,
3615 &sdata->u.mgd.monitor_work);
3616 /* and do all the other regular work too */
3617 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3618 }
3619 }
3620
3621 #ifdef CONFIG_PM
3622 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
3623 {
3624 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3625 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3626
3627 sdata_lock(sdata);
3628
3629 if (ifmgd->auth_data || ifmgd->assoc_data) {
3630 const u8 *bssid = ifmgd->auth_data ?
3631 ifmgd->auth_data->bss->bssid :
3632 ifmgd->assoc_data->bss->bssid;
3633
3634 /*
3635 * If we are trying to authenticate / associate while suspending,
3636 * cfg80211 won't know and won't actually abort those attempts,
3637 * thus we need to do that ourselves.
3638 */
3639 ieee80211_send_deauth_disassoc(sdata, bssid,
3640 IEEE80211_STYPE_DEAUTH,
3641 WLAN_REASON_DEAUTH_LEAVING,
3642 false, frame_buf);
3643 if (ifmgd->assoc_data)
3644 ieee80211_destroy_assoc_data(sdata, false);
3645 if (ifmgd->auth_data)
3646 ieee80211_destroy_auth_data(sdata, false);
3647 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
3648 IEEE80211_DEAUTH_FRAME_LEN);
3649 }
3650
3651 sdata_unlock(sdata);
3652 }
3653
3654 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
3655 {
3656 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3657
3658 sdata_lock(sdata);
3659 if (!ifmgd->associated) {
3660 sdata_unlock(sdata);
3661 return;
3662 }
3663
3664 if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
3665 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
3666 mlme_dbg(sdata, "driver requested disconnect after resume\n");
3667 ieee80211_sta_connection_lost(sdata,
3668 ifmgd->associated->bssid,
3669 WLAN_REASON_UNSPECIFIED,
3670 true);
3671 sdata_unlock(sdata);
3672 return;
3673 }
3674 sdata_unlock(sdata);
3675 }
3676 #endif
3677
3678 /* interface setup */
3679 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3680 {
3681 struct ieee80211_if_managed *ifmgd;
3682
3683 ifmgd = &sdata->u.mgd;
3684 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3685 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3686 INIT_WORK(&ifmgd->beacon_connection_loss_work,
3687 ieee80211_beacon_connection_loss_work);
3688 INIT_WORK(&ifmgd->csa_connection_drop_work,
3689 ieee80211_csa_connection_drop_work);
3690 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
3691 setup_timer(&ifmgd->timer, ieee80211_sta_timer,
3692 (unsigned long) sdata);
3693 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
3694 (unsigned long) sdata);
3695 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
3696 (unsigned long) sdata);
3697 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
3698 (unsigned long) sdata);
3699
3700 ifmgd->flags = 0;
3701 ifmgd->powersave = sdata->wdev.ps;
3702 ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
3703 ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
3704 ifmgd->p2p_noa_index = -1;
3705
3706 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
3707 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
3708 else
3709 ifmgd->req_smps = IEEE80211_SMPS_OFF;
3710 }
3711
3712 /* scan finished notification */
3713 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
3714 {
3715 struct ieee80211_sub_if_data *sdata;
3716
3717 /* Restart STA timers */
3718 rcu_read_lock();
3719 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3720 if (ieee80211_sdata_running(sdata))
3721 ieee80211_restart_sta_timer(sdata);
3722 }
3723 rcu_read_unlock();
3724 }
3725
3726 int ieee80211_max_network_latency(struct notifier_block *nb,
3727 unsigned long data, void *dummy)
3728 {
3729 s32 latency_usec = (s32) data;
3730 struct ieee80211_local *local =
3731 container_of(nb, struct ieee80211_local,
3732 network_latency_notifier);
3733
3734 mutex_lock(&local->iflist_mtx);
3735 ieee80211_recalc_ps(local, latency_usec);
3736 mutex_unlock(&local->iflist_mtx);
3737
3738 return NOTIFY_OK;
3739 }
3740
3741 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
3742 struct cfg80211_bss *cbss)
3743 {
3744 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3745 const u8 *ht_cap_ie, *vht_cap_ie;
3746 const struct ieee80211_ht_cap *ht_cap;
3747 const struct ieee80211_vht_cap *vht_cap;
3748 u8 chains = 1;
3749
3750 if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
3751 return chains;
3752
3753 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
3754 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
3755 ht_cap = (void *)(ht_cap_ie + 2);
3756 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
3757 /*
3758 * TODO: use "Tx Maximum Number Spatial Streams Supported" and
3759 * "Tx Unequal Modulation Supported" fields.
3760 */
3761 }
3762
3763 if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
3764 return chains;
3765
3766 vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
3767 if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
3768 u8 nss;
3769 u16 tx_mcs_map;
3770
3771 vht_cap = (void *)(vht_cap_ie + 2);
3772 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
3773 for (nss = 8; nss > 0; nss--) {
3774 if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
3775 IEEE80211_VHT_MCS_NOT_SUPPORTED)
3776 break;
3777 }
3778 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
3779 chains = max(chains, nss);
3780 }
3781
3782 return chains;
3783 }
3784
3785 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
3786 struct cfg80211_bss *cbss)
3787 {
3788 struct ieee80211_local *local = sdata->local;
3789 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3790 const struct ieee80211_ht_operation *ht_oper = NULL;
3791 const struct ieee80211_vht_operation *vht_oper = NULL;
3792 struct ieee80211_supported_band *sband;
3793 struct cfg80211_chan_def chandef;
3794 int ret;
3795
3796 sband = local->hw.wiphy->bands[cbss->channel->band];
3797
3798 ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
3799 IEEE80211_STA_DISABLE_80P80MHZ |
3800 IEEE80211_STA_DISABLE_160MHZ);
3801
3802 rcu_read_lock();
3803
3804 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
3805 sband->ht_cap.ht_supported) {
3806 const u8 *ht_oper_ie, *ht_cap;
3807
3808 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
3809 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3810 ht_oper = (void *)(ht_oper_ie + 2);
3811
3812 ht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
3813 if (!ht_cap || ht_cap[1] < sizeof(struct ieee80211_ht_cap)) {
3814 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3815 ht_oper = NULL;
3816 }
3817 }
3818
3819 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
3820 sband->vht_cap.vht_supported) {
3821 const u8 *vht_oper_ie, *vht_cap;
3822
3823 vht_oper_ie = ieee80211_bss_get_ie(cbss,
3824 WLAN_EID_VHT_OPERATION);
3825 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
3826 vht_oper = (void *)(vht_oper_ie + 2);
3827 if (vht_oper && !ht_oper) {
3828 vht_oper = NULL;
3829 sdata_info(sdata,
3830 "AP advertised VHT without HT, disabling both\n");
3831 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3832 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3833 }
3834
3835 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
3836 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
3837 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3838 vht_oper = NULL;
3839 }
3840 }
3841
3842 ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
3843 cbss->channel,
3844 ht_oper, vht_oper,
3845 &chandef, false);
3846
3847 sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
3848 local->rx_chains);
3849
3850 rcu_read_unlock();
3851
3852 /* will change later if needed */
3853 sdata->smps_mode = IEEE80211_SMPS_OFF;
3854
3855 mutex_lock(&local->mtx);
3856 /*
3857 * If this fails (possibly due to channel context sharing
3858 * on incompatible channels, e.g. 80+80 and 160 sharing the
3859 * same control channel) try to use a smaller bandwidth.
3860 */
3861 ret = ieee80211_vif_use_channel(sdata, &chandef,
3862 IEEE80211_CHANCTX_SHARED);
3863
3864 /* don't downgrade for 5 and 10 MHz channels, though. */
3865 if (chandef.width == NL80211_CHAN_WIDTH_5 ||
3866 chandef.width == NL80211_CHAN_WIDTH_10)
3867 goto out;
3868
3869 while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
3870 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
3871 ret = ieee80211_vif_use_channel(sdata, &chandef,
3872 IEEE80211_CHANCTX_SHARED);
3873 }
3874 out:
3875 mutex_unlock(&local->mtx);
3876 return ret;
3877 }
3878
3879 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3880 struct cfg80211_bss *cbss, bool assoc)
3881 {
3882 struct ieee80211_local *local = sdata->local;
3883 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3884 struct ieee80211_bss *bss = (void *)cbss->priv;
3885 struct sta_info *new_sta = NULL;
3886 bool have_sta = false;
3887 int err;
3888
3889 if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3890 return -EINVAL;
3891
3892 if (assoc) {
3893 rcu_read_lock();
3894 have_sta = sta_info_get(sdata, cbss->bssid);
3895 rcu_read_unlock();
3896 }
3897
3898 if (!have_sta) {
3899 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3900 if (!new_sta)
3901 return -ENOMEM;
3902 }
3903 if (new_sta) {
3904 u32 rates = 0, basic_rates = 0;
3905 bool have_higher_than_11mbit;
3906 int min_rate = INT_MAX, min_rate_index = -1;
3907 struct ieee80211_chanctx_conf *chanctx_conf;
3908 struct ieee80211_supported_band *sband;
3909 const struct cfg80211_bss_ies *ies;
3910 int shift;
3911 u32 rate_flags;
3912
3913 sband = local->hw.wiphy->bands[cbss->channel->band];
3914
3915 err = ieee80211_prep_channel(sdata, cbss);
3916 if (err) {
3917 sta_info_free(local, new_sta);
3918 return -EINVAL;
3919 }
3920 shift = ieee80211_vif_get_shift(&sdata->vif);
3921
3922 rcu_read_lock();
3923 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3924 if (WARN_ON(!chanctx_conf)) {
3925 rcu_read_unlock();
3926 sta_info_free(local, new_sta);
3927 return -EINVAL;
3928 }
3929 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
3930 rcu_read_unlock();
3931
3932 ieee80211_get_rates(sband, bss->supp_rates,
3933 bss->supp_rates_len,
3934 &rates, &basic_rates,
3935 &have_higher_than_11mbit,
3936 &min_rate, &min_rate_index,
3937 shift, rate_flags);
3938
3939 /*
3940 * This used to be a workaround for basic rates missing
3941 * in the association response frame. Now that we no
3942 * longer use the basic rates from there, it probably
3943 * doesn't happen any more, but keep the workaround so
3944 * in case some *other* APs are buggy in different ways
3945 * we can connect -- with a warning.
3946 */
3947 if (!basic_rates && min_rate_index >= 0) {
3948 sdata_info(sdata,
3949 "No basic rates, using min rate instead\n");
3950 basic_rates = BIT(min_rate_index);
3951 }
3952
3953 new_sta->sta.supp_rates[cbss->channel->band] = rates;
3954 sdata->vif.bss_conf.basic_rates = basic_rates;
3955
3956 /* cf. IEEE 802.11 9.2.12 */
3957 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
3958 have_higher_than_11mbit)
3959 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
3960 else
3961 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
3962
3963 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
3964
3965 /* set timing information */
3966 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
3967 rcu_read_lock();
3968 ies = rcu_dereference(cbss->beacon_ies);
3969 if (ies) {
3970 const u8 *tim_ie;
3971
3972 sdata->vif.bss_conf.sync_tsf = ies->tsf;
3973 sdata->vif.bss_conf.sync_device_ts =
3974 bss->device_ts_beacon;
3975 tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
3976 ies->data, ies->len);
3977 if (tim_ie && tim_ie[1] >= 2)
3978 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
3979 else
3980 sdata->vif.bss_conf.sync_dtim_count = 0;
3981 } else if (!(local->hw.flags &
3982 IEEE80211_HW_TIMING_BEACON_ONLY)) {
3983 ies = rcu_dereference(cbss->proberesp_ies);
3984 /* must be non-NULL since beacon IEs were NULL */
3985 sdata->vif.bss_conf.sync_tsf = ies->tsf;
3986 sdata->vif.bss_conf.sync_device_ts =
3987 bss->device_ts_presp;
3988 sdata->vif.bss_conf.sync_dtim_count = 0;
3989 } else {
3990 sdata->vif.bss_conf.sync_tsf = 0;
3991 sdata->vif.bss_conf.sync_device_ts = 0;
3992 sdata->vif.bss_conf.sync_dtim_count = 0;
3993 }
3994 rcu_read_unlock();
3995
3996 /* tell driver about BSSID, basic rates and timing */
3997 ieee80211_bss_info_change_notify(sdata,
3998 BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
3999 BSS_CHANGED_BEACON_INT);
4000
4001 if (assoc)
4002 sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4003
4004 err = sta_info_insert(new_sta);
4005 new_sta = NULL;
4006 if (err) {
4007 sdata_info(sdata,
4008 "failed to insert STA entry for the AP (error %d)\n",
4009 err);
4010 return err;
4011 }
4012 } else
4013 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4014
4015 return 0;
4016 }
4017
4018 /* config hooks */
4019 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4020 struct cfg80211_auth_request *req)
4021 {
4022 struct ieee80211_local *local = sdata->local;
4023 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4024 struct ieee80211_mgd_auth_data *auth_data;
4025 u16 auth_alg;
4026 int err;
4027
4028 /* prepare auth data structure */
4029
4030 switch (req->auth_type) {
4031 case NL80211_AUTHTYPE_OPEN_SYSTEM:
4032 auth_alg = WLAN_AUTH_OPEN;
4033 break;
4034 case NL80211_AUTHTYPE_SHARED_KEY:
4035 if (IS_ERR(local->wep_tx_tfm))
4036 return -EOPNOTSUPP;
4037 auth_alg = WLAN_AUTH_SHARED_KEY;
4038 break;
4039 case NL80211_AUTHTYPE_FT:
4040 auth_alg = WLAN_AUTH_FT;
4041 break;
4042 case NL80211_AUTHTYPE_NETWORK_EAP:
4043 auth_alg = WLAN_AUTH_LEAP;
4044 break;
4045 case NL80211_AUTHTYPE_SAE:
4046 auth_alg = WLAN_AUTH_SAE;
4047 break;
4048 default:
4049 return -EOPNOTSUPP;
4050 }
4051
4052 auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
4053 req->ie_len, GFP_KERNEL);
4054 if (!auth_data)
4055 return -ENOMEM;
4056
4057 auth_data->bss = req->bss;
4058
4059 if (req->sae_data_len >= 4) {
4060 __le16 *pos = (__le16 *) req->sae_data;
4061 auth_data->sae_trans = le16_to_cpu(pos[0]);
4062 auth_data->sae_status = le16_to_cpu(pos[1]);
4063 memcpy(auth_data->data, req->sae_data + 4,
4064 req->sae_data_len - 4);
4065 auth_data->data_len += req->sae_data_len - 4;
4066 }
4067
4068 if (req->ie && req->ie_len) {
4069 memcpy(&auth_data->data[auth_data->data_len],
4070 req->ie, req->ie_len);
4071 auth_data->data_len += req->ie_len;
4072 }
4073
4074 if (req->key && req->key_len) {
4075 auth_data->key_len = req->key_len;
4076 auth_data->key_idx = req->key_idx;
4077 memcpy(auth_data->key, req->key, req->key_len);
4078 }
4079
4080 auth_data->algorithm = auth_alg;
4081
4082 /* try to authenticate/probe */
4083
4084 if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4085 ifmgd->assoc_data) {
4086 err = -EBUSY;
4087 goto err_free;
4088 }
4089
4090 if (ifmgd->auth_data)
4091 ieee80211_destroy_auth_data(sdata, false);
4092
4093 /* prep auth_data so we don't go into idle on disassoc */
4094 ifmgd->auth_data = auth_data;
4095
4096 if (ifmgd->associated) {
4097 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4098
4099 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4100 WLAN_REASON_UNSPECIFIED,
4101 false, frame_buf);
4102
4103 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4104 sizeof(frame_buf));
4105 }
4106
4107 sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4108
4109 err = ieee80211_prep_connection(sdata, req->bss, false);
4110 if (err)
4111 goto err_clear;
4112
4113 err = ieee80211_probe_auth(sdata);
4114 if (err) {
4115 sta_info_destroy_addr(sdata, req->bss->bssid);
4116 goto err_clear;
4117 }
4118
4119 /* hold our own reference */
4120 cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4121 return 0;
4122
4123 err_clear:
4124 memset(ifmgd->bssid, 0, ETH_ALEN);
4125 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4126 ifmgd->auth_data = NULL;
4127 err_free:
4128 kfree(auth_data);
4129 return err;
4130 }
4131
4132 static bool ieee80211_usable_wmm_params(struct ieee80211_sub_if_data *sdata,
4133 const u8 *wmm_param, int len)
4134 {
4135 const u8 *pos;
4136 size_t left;
4137
4138 if (len < 8)
4139 return false;
4140
4141 if (wmm_param[5] != 1 /* version */)
4142 return false;
4143
4144 pos = wmm_param + 8;
4145 left = len - 8;
4146
4147 for (; left >= 4; left -= 4, pos += 4) {
4148 u8 aifsn = pos[0] & 0x0f;
4149 u8 ecwmin = pos[1] & 0x0f;
4150 u8 ecwmax = (pos[1] & 0xf0) >> 4;
4151 int aci = (pos[0] >> 5) & 0x03;
4152
4153 if (aifsn < 2) {
4154 sdata_info(sdata,
4155 "AP has invalid WMM params (AIFSN=%d for ACI %d), disabling WMM\n",
4156 aifsn, aci);
4157 return false;
4158 }
4159 if (ecwmin > ecwmax) {
4160 sdata_info(sdata,
4161 "AP has invalid WMM params (ECWmin/max=%d/%d for ACI %d), disabling WMM\n",
4162 ecwmin, ecwmax, aci);
4163 return false;
4164 }
4165 }
4166
4167 return true;
4168 }
4169
4170 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4171 struct cfg80211_assoc_request *req)
4172 {
4173 struct ieee80211_local *local = sdata->local;
4174 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4175 struct ieee80211_bss *bss = (void *)req->bss->priv;
4176 struct ieee80211_mgd_assoc_data *assoc_data;
4177 const struct cfg80211_bss_ies *beacon_ies;
4178 struct ieee80211_supported_band *sband;
4179 const u8 *ssidie, *ht_ie, *vht_ie;
4180 int i, err;
4181
4182 assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4183 if (!assoc_data)
4184 return -ENOMEM;
4185
4186 rcu_read_lock();
4187 ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4188 if (!ssidie) {
4189 rcu_read_unlock();
4190 kfree(assoc_data);
4191 return -EINVAL;
4192 }
4193 memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4194 assoc_data->ssid_len = ssidie[1];
4195 rcu_read_unlock();
4196
4197 if (ifmgd->associated) {
4198 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4199
4200 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4201 WLAN_REASON_UNSPECIFIED,
4202 false, frame_buf);
4203
4204 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4205 sizeof(frame_buf));
4206 }
4207
4208 if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4209 err = -EBUSY;
4210 goto err_free;
4211 }
4212
4213 if (ifmgd->assoc_data) {
4214 err = -EBUSY;
4215 goto err_free;
4216 }
4217
4218 if (ifmgd->auth_data) {
4219 bool match;
4220
4221 /* keep sta info, bssid if matching */
4222 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4223 ieee80211_destroy_auth_data(sdata, match);
4224 }
4225
4226 /* prepare assoc data */
4227
4228 ifmgd->beacon_crc_valid = false;
4229
4230 assoc_data->wmm = bss->wmm_used &&
4231 (local->hw.queues >= IEEE80211_NUM_ACS);
4232 if (assoc_data->wmm) {
4233 /* try to check validity of WMM params IE */
4234 const struct cfg80211_bss_ies *ies;
4235 const u8 *wp, *start, *end;
4236
4237 rcu_read_lock();
4238 ies = rcu_dereference(req->bss->ies);
4239 start = ies->data;
4240 end = start + ies->len;
4241
4242 while (true) {
4243 wp = cfg80211_find_vendor_ie(
4244 WLAN_OUI_MICROSOFT,
4245 WLAN_OUI_TYPE_MICROSOFT_WMM,
4246 start, end - start);
4247 if (!wp)
4248 break;
4249 start = wp + wp[1] + 2;
4250 /* if this IE is too short, try the next */
4251 if (wp[1] <= 4)
4252 continue;
4253 /* if this IE is WMM params, we found what we wanted */
4254 if (wp[6] == 1)
4255 break;
4256 }
4257
4258 if (!wp || !ieee80211_usable_wmm_params(sdata, wp + 2,
4259 wp[1] - 2)) {
4260 assoc_data->wmm = false;
4261 ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
4262 }
4263 rcu_read_unlock();
4264 }
4265
4266 /*
4267 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4268 * We still associate in non-HT mode (11a/b/g) if any one of these
4269 * ciphers is configured as pairwise.
4270 * We can set this to true for non-11n hardware, that'll be checked
4271 * separately along with the peer capabilities.
4272 */
4273 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4274 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4275 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4276 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4277 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4278 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4279 netdev_info(sdata->dev,
4280 "disabling HT/VHT due to WEP/TKIP use\n");
4281 }
4282 }
4283
4284 if (req->flags & ASSOC_REQ_DISABLE_HT) {
4285 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4286 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4287 }
4288
4289 if (req->flags & ASSOC_REQ_DISABLE_VHT)
4290 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4291
4292 /* Also disable HT if we don't support it or the AP doesn't use WMM */
4293 sband = local->hw.wiphy->bands[req->bss->channel->band];
4294 if (!sband->ht_cap.ht_supported ||
4295 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4296 ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4297 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4298 if (!bss->wmm_used &&
4299 !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4300 netdev_info(sdata->dev,
4301 "disabling HT as WMM/QoS is not supported by the AP\n");
4302 }
4303
4304 /* disable VHT if we don't support it or the AP doesn't use WMM */
4305 if (!sband->vht_cap.vht_supported ||
4306 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4307 ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4308 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4309 if (!bss->wmm_used &&
4310 !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4311 netdev_info(sdata->dev,
4312 "disabling VHT as WMM/QoS is not supported by the AP\n");
4313 }
4314
4315 memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4316 memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4317 sizeof(ifmgd->ht_capa_mask));
4318
4319 memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4320 memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4321 sizeof(ifmgd->vht_capa_mask));
4322
4323 if (req->ie && req->ie_len) {
4324 memcpy(assoc_data->ie, req->ie, req->ie_len);
4325 assoc_data->ie_len = req->ie_len;
4326 }
4327
4328 assoc_data->bss = req->bss;
4329
4330 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4331 if (ifmgd->powersave)
4332 sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4333 else
4334 sdata->smps_mode = IEEE80211_SMPS_OFF;
4335 } else
4336 sdata->smps_mode = ifmgd->req_smps;
4337
4338 assoc_data->capability = req->bss->capability;
4339 assoc_data->supp_rates = bss->supp_rates;
4340 assoc_data->supp_rates_len = bss->supp_rates_len;
4341
4342 rcu_read_lock();
4343 ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4344 if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4345 assoc_data->ap_ht_param =
4346 ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4347 else
4348 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4349 vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4350 if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4351 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4352 sizeof(struct ieee80211_vht_cap));
4353 else
4354 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4355 rcu_read_unlock();
4356
4357 if (bss->wmm_used && bss->uapsd_supported &&
4358 (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD) &&
4359 sdata->wmm_acm != 0xff) {
4360 assoc_data->uapsd = true;
4361 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4362 } else {
4363 assoc_data->uapsd = false;
4364 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4365 }
4366
4367 if (req->prev_bssid)
4368 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4369
4370 if (req->use_mfp) {
4371 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4372 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4373 } else {
4374 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4375 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4376 }
4377
4378 if (req->crypto.control_port)
4379 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4380 else
4381 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4382
4383 sdata->control_port_protocol = req->crypto.control_port_ethertype;
4384 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4385 sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4386 sdata->vif.type);
4387
4388 /* kick off associate process */
4389
4390 ifmgd->assoc_data = assoc_data;
4391 ifmgd->dtim_period = 0;
4392 ifmgd->have_beacon = false;
4393
4394 err = ieee80211_prep_connection(sdata, req->bss, true);
4395 if (err)
4396 goto err_clear;
4397
4398 rcu_read_lock();
4399 beacon_ies = rcu_dereference(req->bss->beacon_ies);
4400
4401 if (sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC &&
4402 !beacon_ies) {
4403 /*
4404 * Wait up to one beacon interval ...
4405 * should this be more if we miss one?
4406 */
4407 sdata_info(sdata, "waiting for beacon from %pM\n",
4408 ifmgd->bssid);
4409 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4410 assoc_data->timeout_started = true;
4411 assoc_data->need_beacon = true;
4412 } else if (beacon_ies) {
4413 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4414 beacon_ies->data,
4415 beacon_ies->len);
4416 u8 dtim_count = 0;
4417
4418 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4419 const struct ieee80211_tim_ie *tim;
4420 tim = (void *)(tim_ie + 2);
4421 ifmgd->dtim_period = tim->dtim_period;
4422 dtim_count = tim->dtim_count;
4423 }
4424 ifmgd->have_beacon = true;
4425 assoc_data->timeout = jiffies;
4426 assoc_data->timeout_started = true;
4427
4428 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
4429 sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4430 sdata->vif.bss_conf.sync_device_ts =
4431 bss->device_ts_beacon;
4432 sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4433 }
4434 } else {
4435 assoc_data->timeout = jiffies;
4436 assoc_data->timeout_started = true;
4437 }
4438 rcu_read_unlock();
4439
4440 run_again(sdata, assoc_data->timeout);
4441
4442 if (bss->corrupt_data) {
4443 char *corrupt_type = "data";
4444 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4445 if (bss->corrupt_data &
4446 IEEE80211_BSS_CORRUPT_PROBE_RESP)
4447 corrupt_type = "beacon and probe response";
4448 else
4449 corrupt_type = "beacon";
4450 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4451 corrupt_type = "probe response";
4452 sdata_info(sdata, "associating with AP with corrupt %s\n",
4453 corrupt_type);
4454 }
4455
4456 return 0;
4457 err_clear:
4458 memset(ifmgd->bssid, 0, ETH_ALEN);
4459 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4460 ifmgd->assoc_data = NULL;
4461 err_free:
4462 kfree(assoc_data);
4463 return err;
4464 }
4465
4466 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4467 struct cfg80211_deauth_request *req)
4468 {
4469 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4470 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4471 bool tx = !req->local_state_change;
4472
4473 if (ifmgd->auth_data &&
4474 ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
4475 sdata_info(sdata,
4476 "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
4477 req->bssid, req->reason_code,
4478 ieee80211_get_reason_code_string(req->reason_code));
4479
4480 drv_mgd_prepare_tx(sdata->local, sdata);
4481 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4482 IEEE80211_STYPE_DEAUTH,
4483 req->reason_code, tx,
4484 frame_buf);
4485 ieee80211_destroy_auth_data(sdata, false);
4486 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4487 IEEE80211_DEAUTH_FRAME_LEN);
4488
4489 return 0;
4490 }
4491
4492 if (ifmgd->associated &&
4493 ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4494 sdata_info(sdata,
4495 "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
4496 req->bssid, req->reason_code,
4497 ieee80211_get_reason_code_string(req->reason_code));
4498
4499 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4500 req->reason_code, tx, frame_buf);
4501 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4502 IEEE80211_DEAUTH_FRAME_LEN);
4503 return 0;
4504 }
4505
4506 return -ENOTCONN;
4507 }
4508
4509 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4510 struct cfg80211_disassoc_request *req)
4511 {
4512 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4513 u8 bssid[ETH_ALEN];
4514 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4515
4516 /*
4517 * cfg80211 should catch this ... but it's racy since
4518 * we can receive a disassoc frame, process it, hand it
4519 * to cfg80211 while that's in a locked section already
4520 * trying to tell us that the user wants to disconnect.
4521 */
4522 if (ifmgd->associated != req->bss)
4523 return -ENOLINK;
4524
4525 sdata_info(sdata,
4526 "disassociating from %pM by local choice (Reason: %u=%s)\n",
4527 req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
4528
4529 memcpy(bssid, req->bss->bssid, ETH_ALEN);
4530 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
4531 req->reason_code, !req->local_state_change,
4532 frame_buf);
4533
4534 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4535 IEEE80211_DEAUTH_FRAME_LEN);
4536
4537 return 0;
4538 }
4539
4540 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4541 {
4542 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4543
4544 /*
4545 * Make sure some work items will not run after this,
4546 * they will not do anything but might not have been
4547 * cancelled when disconnecting.
4548 */
4549 cancel_work_sync(&ifmgd->monitor_work);
4550 cancel_work_sync(&ifmgd->beacon_connection_loss_work);
4551 cancel_work_sync(&ifmgd->request_smps_work);
4552 cancel_work_sync(&ifmgd->csa_connection_drop_work);
4553 cancel_work_sync(&ifmgd->chswitch_work);
4554
4555 sdata_lock(sdata);
4556 if (ifmgd->assoc_data) {
4557 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
4558 ieee80211_destroy_assoc_data(sdata, false);
4559 cfg80211_assoc_timeout(sdata->dev, bss);
4560 }
4561 if (ifmgd->auth_data)
4562 ieee80211_destroy_auth_data(sdata, false);
4563 del_timer_sync(&ifmgd->timer);
4564 sdata_unlock(sdata);
4565 }
4566
4567 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
4568 enum nl80211_cqm_rssi_threshold_event rssi_event,
4569 gfp_t gfp)
4570 {
4571 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4572
4573 trace_api_cqm_rssi_notify(sdata, rssi_event);
4574
4575 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
4576 }
4577 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
Linux kernel - Deliverables
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