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mac80211: pass station to ieee80211_vht_cap_ie_to_sta_vht_cap
[mirror_ubuntu-bionic-kernel.git] / net / mac80211 / mlme.c
1 /*
2 * BSS client mode implementation
3 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4 * Copyright 2004, Instant802 Networks, Inc.
5 * Copyright 2005, Devicescape Software, Inc.
6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14 #include <linux/delay.h>
15 #include <linux/if_ether.h>
16 #include <linux/skbuff.h>
17 #include <linux/if_arp.h>
18 #include <linux/etherdevice.h>
19 #include <linux/moduleparam.h>
20 #include <linux/rtnetlink.h>
21 #include <linux/pm_qos.h>
22 #include <linux/crc32.h>
23 #include <linux/slab.h>
24 #include <linux/export.h>
25 #include <net/mac80211.h>
26 #include <asm/unaligned.h>
27
28 #include "ieee80211_i.h"
29 #include "driver-ops.h"
30 #include "rate.h"
31 #include "led.h"
32
33 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
34 #define IEEE80211_AUTH_TIMEOUT_SHORT (HZ / 10)
35 #define IEEE80211_AUTH_MAX_TRIES 3
36 #define IEEE80211_AUTH_WAIT_ASSOC (HZ * 5)
37 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
38 #define IEEE80211_ASSOC_TIMEOUT_SHORT (HZ / 10)
39 #define IEEE80211_ASSOC_MAX_TRIES 3
40
41 static int max_nullfunc_tries = 2;
42 module_param(max_nullfunc_tries, int, 0644);
43 MODULE_PARM_DESC(max_nullfunc_tries,
44 "Maximum nullfunc tx tries before disconnecting (reason 4).");
45
46 static int max_probe_tries = 5;
47 module_param(max_probe_tries, int, 0644);
48 MODULE_PARM_DESC(max_probe_tries,
49 "Maximum probe tries before disconnecting (reason 4).");
50
51 /*
52 * Beacon loss timeout is calculated as N frames times the
53 * advertised beacon interval. This may need to be somewhat
54 * higher than what hardware might detect to account for
55 * delays in the host processing frames. But since we also
56 * probe on beacon miss before declaring the connection lost
57 * default to what we want.
58 */
59 #define IEEE80211_BEACON_LOSS_COUNT 7
60
61 /*
62 * Time the connection can be idle before we probe
63 * it to see if we can still talk to the AP.
64 */
65 #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ)
66 /*
67 * Time we wait for a probe response after sending
68 * a probe request because of beacon loss or for
69 * checking the connection still works.
70 */
71 static int probe_wait_ms = 500;
72 module_param(probe_wait_ms, int, 0644);
73 MODULE_PARM_DESC(probe_wait_ms,
74 "Maximum time(ms) to wait for probe response"
75 " before disconnecting (reason 4).");
76
77 /*
78 * Weight given to the latest Beacon frame when calculating average signal
79 * strength for Beacon frames received in the current BSS. This must be
80 * between 1 and 15.
81 */
82 #define IEEE80211_SIGNAL_AVE_WEIGHT 3
83
84 /*
85 * How many Beacon frames need to have been used in average signal strength
86 * before starting to indicate signal change events.
87 */
88 #define IEEE80211_SIGNAL_AVE_MIN_COUNT 4
89
90 #define TMR_RUNNING_TIMER 0
91 #define TMR_RUNNING_CHANSW 1
92
93 /*
94 * All cfg80211 functions have to be called outside a locked
95 * section so that they can acquire a lock themselves... This
96 * is much simpler than queuing up things in cfg80211, but we
97 * do need some indirection for that here.
98 */
99 enum rx_mgmt_action {
100 /* no action required */
101 RX_MGMT_NONE,
102
103 /* caller must call cfg80211_send_deauth() */
104 RX_MGMT_CFG80211_DEAUTH,
105
106 /* caller must call cfg80211_send_disassoc() */
107 RX_MGMT_CFG80211_DISASSOC,
108
109 /* caller must call cfg80211_send_rx_auth() */
110 RX_MGMT_CFG80211_RX_AUTH,
111
112 /* caller must call cfg80211_send_rx_assoc() */
113 RX_MGMT_CFG80211_RX_ASSOC,
114
115 /* caller must call cfg80211_send_assoc_timeout() */
116 RX_MGMT_CFG80211_ASSOC_TIMEOUT,
117 };
118
119 /* utils */
120 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
121 {
122 lockdep_assert_held(&ifmgd->mtx);
123 }
124
125 /*
126 * We can have multiple work items (and connection probing)
127 * scheduling this timer, but we need to take care to only
128 * reschedule it when it should fire _earlier_ than it was
129 * asked for before, or if it's not pending right now. This
130 * function ensures that. Note that it then is required to
131 * run this function for all timeouts after the first one
132 * has happened -- the work that runs from this timer will
133 * do that.
134 */
135 static void run_again(struct ieee80211_if_managed *ifmgd, unsigned long timeout)
136 {
137 ASSERT_MGD_MTX(ifmgd);
138
139 if (!timer_pending(&ifmgd->timer) ||
140 time_before(timeout, ifmgd->timer.expires))
141 mod_timer(&ifmgd->timer, timeout);
142 }
143
144 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
145 {
146 if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
147 return;
148
149 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
150 return;
151
152 mod_timer(&sdata->u.mgd.bcn_mon_timer,
153 round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
154 }
155
156 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
157 {
158 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
159
160 if (unlikely(!sdata->u.mgd.associated))
161 return;
162
163 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
164 return;
165
166 mod_timer(&sdata->u.mgd.conn_mon_timer,
167 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
168
169 ifmgd->probe_send_count = 0;
170 }
171
172 static int ecw2cw(int ecw)
173 {
174 return (1 << ecw) - 1;
175 }
176
177 static u32 ieee80211_config_ht_tx(struct ieee80211_sub_if_data *sdata,
178 struct ieee80211_ht_operation *ht_oper,
179 const u8 *bssid, bool reconfig)
180 {
181 struct ieee80211_local *local = sdata->local;
182 struct ieee80211_supported_band *sband;
183 struct ieee80211_chanctx_conf *chanctx_conf;
184 struct ieee80211_channel *chan;
185 struct sta_info *sta;
186 u32 changed = 0;
187 u16 ht_opmode;
188 bool disable_40 = false;
189
190 rcu_read_lock();
191 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
192 if (WARN_ON(!chanctx_conf)) {
193 rcu_read_unlock();
194 return 0;
195 }
196 chan = chanctx_conf->def.chan;
197 rcu_read_unlock();
198 sband = local->hw.wiphy->bands[chan->band];
199
200 switch (sdata->vif.bss_conf.chandef.width) {
201 case NL80211_CHAN_WIDTH_40:
202 if (sdata->vif.bss_conf.chandef.chan->center_freq >
203 sdata->vif.bss_conf.chandef.center_freq1 &&
204 chan->flags & IEEE80211_CHAN_NO_HT40MINUS)
205 disable_40 = true;
206 if (sdata->vif.bss_conf.chandef.chan->center_freq <
207 sdata->vif.bss_conf.chandef.center_freq1 &&
208 chan->flags & IEEE80211_CHAN_NO_HT40PLUS)
209 disable_40 = true;
210 break;
211 default:
212 break;
213 }
214
215 /* This can change during the lifetime of the BSS */
216 if (!(ht_oper->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY))
217 disable_40 = true;
218
219 mutex_lock(&local->sta_mtx);
220 sta = sta_info_get(sdata, bssid);
221
222 WARN_ON_ONCE(!sta);
223
224 if (sta && !sta->supports_40mhz)
225 disable_40 = true;
226
227 if (sta && (!reconfig ||
228 (disable_40 != !(sta->sta.ht_cap.cap &
229 IEEE80211_HT_CAP_SUP_WIDTH_20_40)))) {
230
231 if (disable_40)
232 sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
233 else
234 sta->sta.ht_cap.cap |= IEEE80211_HT_CAP_SUP_WIDTH_20_40;
235
236 rate_control_rate_update(local, sband, sta,
237 IEEE80211_RC_BW_CHANGED);
238 }
239 mutex_unlock(&local->sta_mtx);
240
241 ht_opmode = le16_to_cpu(ht_oper->operation_mode);
242
243 /* if bss configuration changed store the new one */
244 if (!reconfig || (sdata->vif.bss_conf.ht_operation_mode != ht_opmode)) {
245 changed |= BSS_CHANGED_HT;
246 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
247 }
248
249 return changed;
250 }
251
252 /* frame sending functions */
253
254 static int ieee80211_compatible_rates(const u8 *supp_rates, int supp_rates_len,
255 struct ieee80211_supported_band *sband,
256 u32 *rates)
257 {
258 int i, j, count;
259 *rates = 0;
260 count = 0;
261 for (i = 0; i < supp_rates_len; i++) {
262 int rate = (supp_rates[i] & 0x7F) * 5;
263
264 for (j = 0; j < sband->n_bitrates; j++)
265 if (sband->bitrates[j].bitrate == rate) {
266 *rates |= BIT(j);
267 count++;
268 break;
269 }
270 }
271
272 return count;
273 }
274
275 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
276 struct sk_buff *skb, u8 ap_ht_param,
277 struct ieee80211_supported_band *sband,
278 struct ieee80211_channel *channel,
279 enum ieee80211_smps_mode smps)
280 {
281 u8 *pos;
282 u32 flags = channel->flags;
283 u16 cap;
284 struct ieee80211_sta_ht_cap ht_cap;
285
286 BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
287
288 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
289 ieee80211_apply_htcap_overrides(sdata, &ht_cap);
290
291 /* determine capability flags */
292 cap = ht_cap.cap;
293
294 switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
295 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
296 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
297 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
298 cap &= ~IEEE80211_HT_CAP_SGI_40;
299 }
300 break;
301 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
302 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
303 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
304 cap &= ~IEEE80211_HT_CAP_SGI_40;
305 }
306 break;
307 }
308
309 /*
310 * If 40 MHz was disabled associate as though we weren't
311 * capable of 40 MHz -- some broken APs will never fall
312 * back to trying to transmit in 20 MHz.
313 */
314 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
315 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
316 cap &= ~IEEE80211_HT_CAP_SGI_40;
317 }
318
319 /* set SM PS mode properly */
320 cap &= ~IEEE80211_HT_CAP_SM_PS;
321 switch (smps) {
322 case IEEE80211_SMPS_AUTOMATIC:
323 case IEEE80211_SMPS_NUM_MODES:
324 WARN_ON(1);
325 case IEEE80211_SMPS_OFF:
326 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
327 IEEE80211_HT_CAP_SM_PS_SHIFT;
328 break;
329 case IEEE80211_SMPS_STATIC:
330 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
331 IEEE80211_HT_CAP_SM_PS_SHIFT;
332 break;
333 case IEEE80211_SMPS_DYNAMIC:
334 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
335 IEEE80211_HT_CAP_SM_PS_SHIFT;
336 break;
337 }
338
339 /* reserve and fill IE */
340 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
341 ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
342 }
343
344 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
345 struct sk_buff *skb,
346 struct ieee80211_supported_band *sband,
347 struct ieee80211_vht_cap *ap_vht_cap)
348 {
349 u8 *pos;
350 u32 cap;
351 struct ieee80211_sta_vht_cap vht_cap;
352 int i;
353
354 BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
355
356 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
357
358 /* determine capability flags */
359 cap = vht_cap.cap;
360
361 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
362 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ;
363 cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
364 }
365
366 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
367 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
368 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
369 }
370
371 /*
372 * Some APs apparently get confused if our capabilities are better
373 * than theirs, so restrict what we advertise in the assoc request.
374 */
375 if (!(ap_vht_cap->vht_cap_info &
376 cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
377 cap &= ~IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE;
378
379 if (!(ap_vht_cap->vht_cap_info &
380 cpu_to_le32(IEEE80211_VHT_CAP_TXSTBC)))
381 cap &= ~(IEEE80211_VHT_CAP_RXSTBC_1 |
382 IEEE80211_VHT_CAP_RXSTBC_3 |
383 IEEE80211_VHT_CAP_RXSTBC_4);
384
385 for (i = 0; i < 8; i++) {
386 int shift = i * 2;
387 u16 mask = IEEE80211_VHT_MCS_NOT_SUPPORTED << shift;
388 u16 ap_mcs, our_mcs;
389
390 ap_mcs = (le16_to_cpu(ap_vht_cap->supp_mcs.tx_mcs_map) &
391 mask) >> shift;
392 our_mcs = (le16_to_cpu(vht_cap.vht_mcs.rx_mcs_map) &
393 mask) >> shift;
394
395 switch (ap_mcs) {
396 default:
397 if (our_mcs <= ap_mcs)
398 break;
399 /* fall through */
400 case IEEE80211_VHT_MCS_NOT_SUPPORTED:
401 vht_cap.vht_mcs.rx_mcs_map &= cpu_to_le16(~mask);
402 vht_cap.vht_mcs.rx_mcs_map |=
403 cpu_to_le16(ap_mcs << shift);
404 }
405 }
406
407 /* reserve and fill IE */
408 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
409 ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
410 }
411
412 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
413 {
414 struct ieee80211_local *local = sdata->local;
415 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
416 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
417 struct sk_buff *skb;
418 struct ieee80211_mgmt *mgmt;
419 u8 *pos, qos_info;
420 size_t offset = 0, noffset;
421 int i, count, rates_len, supp_rates_len;
422 u16 capab;
423 struct ieee80211_supported_band *sband;
424 struct ieee80211_chanctx_conf *chanctx_conf;
425 struct ieee80211_channel *chan;
426 u32 rates = 0;
427
428 lockdep_assert_held(&ifmgd->mtx);
429
430 rcu_read_lock();
431 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
432 if (WARN_ON(!chanctx_conf)) {
433 rcu_read_unlock();
434 return;
435 }
436 chan = chanctx_conf->def.chan;
437 rcu_read_unlock();
438 sband = local->hw.wiphy->bands[chan->band];
439
440 if (assoc_data->supp_rates_len) {
441 /*
442 * Get all rates supported by the device and the AP as
443 * some APs don't like getting a superset of their rates
444 * in the association request (e.g. D-Link DAP 1353 in
445 * b-only mode)...
446 */
447 rates_len = ieee80211_compatible_rates(assoc_data->supp_rates,
448 assoc_data->supp_rates_len,
449 sband, &rates);
450 } else {
451 /*
452 * In case AP not provide any supported rates information
453 * before association, we send information element(s) with
454 * all rates that we support.
455 */
456 rates = ~0;
457 rates_len = sband->n_bitrates;
458 }
459
460 skb = alloc_skb(local->hw.extra_tx_headroom +
461 sizeof(*mgmt) + /* bit too much but doesn't matter */
462 2 + assoc_data->ssid_len + /* SSID */
463 4 + rates_len + /* (extended) rates */
464 4 + /* power capability */
465 2 + 2 * sband->n_channels + /* supported channels */
466 2 + sizeof(struct ieee80211_ht_cap) + /* HT */
467 2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
468 assoc_data->ie_len + /* extra IEs */
469 9, /* WMM */
470 GFP_KERNEL);
471 if (!skb)
472 return;
473
474 skb_reserve(skb, local->hw.extra_tx_headroom);
475
476 capab = WLAN_CAPABILITY_ESS;
477
478 if (sband->band == IEEE80211_BAND_2GHZ) {
479 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
480 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
481 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
482 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
483 }
484
485 if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
486 capab |= WLAN_CAPABILITY_PRIVACY;
487
488 if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
489 (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
490 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
491
492 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
493 memset(mgmt, 0, 24);
494 memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
495 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
496 memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
497
498 if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
499 skb_put(skb, 10);
500 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
501 IEEE80211_STYPE_REASSOC_REQ);
502 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
503 mgmt->u.reassoc_req.listen_interval =
504 cpu_to_le16(local->hw.conf.listen_interval);
505 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
506 ETH_ALEN);
507 } else {
508 skb_put(skb, 4);
509 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
510 IEEE80211_STYPE_ASSOC_REQ);
511 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
512 mgmt->u.assoc_req.listen_interval =
513 cpu_to_le16(local->hw.conf.listen_interval);
514 }
515
516 /* SSID */
517 pos = skb_put(skb, 2 + assoc_data->ssid_len);
518 *pos++ = WLAN_EID_SSID;
519 *pos++ = assoc_data->ssid_len;
520 memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
521
522 /* add all rates which were marked to be used above */
523 supp_rates_len = rates_len;
524 if (supp_rates_len > 8)
525 supp_rates_len = 8;
526
527 pos = skb_put(skb, supp_rates_len + 2);
528 *pos++ = WLAN_EID_SUPP_RATES;
529 *pos++ = supp_rates_len;
530
531 count = 0;
532 for (i = 0; i < sband->n_bitrates; i++) {
533 if (BIT(i) & rates) {
534 int rate = sband->bitrates[i].bitrate;
535 *pos++ = (u8) (rate / 5);
536 if (++count == 8)
537 break;
538 }
539 }
540
541 if (rates_len > count) {
542 pos = skb_put(skb, rates_len - count + 2);
543 *pos++ = WLAN_EID_EXT_SUPP_RATES;
544 *pos++ = rates_len - count;
545
546 for (i++; i < sband->n_bitrates; i++) {
547 if (BIT(i) & rates) {
548 int rate = sband->bitrates[i].bitrate;
549 *pos++ = (u8) (rate / 5);
550 }
551 }
552 }
553
554 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
555 /* 1. power capabilities */
556 pos = skb_put(skb, 4);
557 *pos++ = WLAN_EID_PWR_CAPABILITY;
558 *pos++ = 2;
559 *pos++ = 0; /* min tx power */
560 *pos++ = chan->max_power; /* max tx power */
561
562 /* 2. supported channels */
563 /* TODO: get this in reg domain format */
564 pos = skb_put(skb, 2 * sband->n_channels + 2);
565 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
566 *pos++ = 2 * sband->n_channels;
567 for (i = 0; i < sband->n_channels; i++) {
568 *pos++ = ieee80211_frequency_to_channel(
569 sband->channels[i].center_freq);
570 *pos++ = 1; /* one channel in the subband*/
571 }
572 }
573
574 /* if present, add any custom IEs that go before HT */
575 if (assoc_data->ie_len && assoc_data->ie) {
576 static const u8 before_ht[] = {
577 WLAN_EID_SSID,
578 WLAN_EID_SUPP_RATES,
579 WLAN_EID_EXT_SUPP_RATES,
580 WLAN_EID_PWR_CAPABILITY,
581 WLAN_EID_SUPPORTED_CHANNELS,
582 WLAN_EID_RSN,
583 WLAN_EID_QOS_CAPA,
584 WLAN_EID_RRM_ENABLED_CAPABILITIES,
585 WLAN_EID_MOBILITY_DOMAIN,
586 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
587 };
588 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
589 before_ht, ARRAY_SIZE(before_ht),
590 offset);
591 pos = skb_put(skb, noffset - offset);
592 memcpy(pos, assoc_data->ie + offset, noffset - offset);
593 offset = noffset;
594 }
595
596 if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
597 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
598 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
599
600 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
601 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
602 sband, chan, sdata->smps_mode);
603
604 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
605 ieee80211_add_vht_ie(sdata, skb, sband,
606 &assoc_data->ap_vht_cap);
607
608 /* if present, add any custom non-vendor IEs that go after HT */
609 if (assoc_data->ie_len && assoc_data->ie) {
610 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
611 assoc_data->ie_len,
612 offset);
613 pos = skb_put(skb, noffset - offset);
614 memcpy(pos, assoc_data->ie + offset, noffset - offset);
615 offset = noffset;
616 }
617
618 if (assoc_data->wmm) {
619 if (assoc_data->uapsd) {
620 qos_info = ifmgd->uapsd_queues;
621 qos_info |= (ifmgd->uapsd_max_sp_len <<
622 IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
623 } else {
624 qos_info = 0;
625 }
626
627 pos = skb_put(skb, 9);
628 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
629 *pos++ = 7; /* len */
630 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
631 *pos++ = 0x50;
632 *pos++ = 0xf2;
633 *pos++ = 2; /* WME */
634 *pos++ = 0; /* WME info */
635 *pos++ = 1; /* WME ver */
636 *pos++ = qos_info;
637 }
638
639 /* add any remaining custom (i.e. vendor specific here) IEs */
640 if (assoc_data->ie_len && assoc_data->ie) {
641 noffset = assoc_data->ie_len;
642 pos = skb_put(skb, noffset - offset);
643 memcpy(pos, assoc_data->ie + offset, noffset - offset);
644 }
645
646 drv_mgd_prepare_tx(local, sdata);
647
648 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
649 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
650 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
651 IEEE80211_TX_INTFL_MLME_CONN_TX;
652 ieee80211_tx_skb(sdata, skb);
653 }
654
655 void ieee80211_send_pspoll(struct ieee80211_local *local,
656 struct ieee80211_sub_if_data *sdata)
657 {
658 struct ieee80211_pspoll *pspoll;
659 struct sk_buff *skb;
660
661 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
662 if (!skb)
663 return;
664
665 pspoll = (struct ieee80211_pspoll *) skb->data;
666 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
667
668 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
669 ieee80211_tx_skb(sdata, skb);
670 }
671
672 void ieee80211_send_nullfunc(struct ieee80211_local *local,
673 struct ieee80211_sub_if_data *sdata,
674 int powersave)
675 {
676 struct sk_buff *skb;
677 struct ieee80211_hdr_3addr *nullfunc;
678 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
679
680 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
681 if (!skb)
682 return;
683
684 nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
685 if (powersave)
686 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
687
688 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
689 IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
690 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
691 IEEE80211_STA_CONNECTION_POLL))
692 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
693
694 ieee80211_tx_skb(sdata, skb);
695 }
696
697 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
698 struct ieee80211_sub_if_data *sdata)
699 {
700 struct sk_buff *skb;
701 struct ieee80211_hdr *nullfunc;
702 __le16 fc;
703
704 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
705 return;
706
707 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
708 if (!skb)
709 return;
710
711 skb_reserve(skb, local->hw.extra_tx_headroom);
712
713 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
714 memset(nullfunc, 0, 30);
715 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
716 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
717 nullfunc->frame_control = fc;
718 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
719 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
720 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
721 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
722
723 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
724 ieee80211_tx_skb(sdata, skb);
725 }
726
727 /* spectrum management related things */
728 static void ieee80211_chswitch_work(struct work_struct *work)
729 {
730 struct ieee80211_sub_if_data *sdata =
731 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
732 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
733
734 if (!ieee80211_sdata_running(sdata))
735 return;
736
737 mutex_lock(&ifmgd->mtx);
738 if (!ifmgd->associated)
739 goto out;
740
741 sdata->local->_oper_channel = sdata->local->csa_channel;
742 if (!sdata->local->ops->channel_switch) {
743 /* call "hw_config" only if doing sw channel switch */
744 ieee80211_hw_config(sdata->local,
745 IEEE80211_CONF_CHANGE_CHANNEL);
746 } else {
747 /* update the device channel directly */
748 sdata->local->hw.conf.channel = sdata->local->_oper_channel;
749 }
750
751 /* XXX: shouldn't really modify cfg80211-owned data! */
752 ifmgd->associated->channel = sdata->local->_oper_channel;
753
754 /* XXX: wait for a beacon first? */
755 ieee80211_wake_queues_by_reason(&sdata->local->hw,
756 IEEE80211_QUEUE_STOP_REASON_CSA);
757 out:
758 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
759 mutex_unlock(&ifmgd->mtx);
760 }
761
762 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
763 {
764 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
765 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
766
767 trace_api_chswitch_done(sdata, success);
768 if (!success) {
769 sdata_info(sdata,
770 "driver channel switch failed, disconnecting\n");
771 ieee80211_queue_work(&sdata->local->hw,
772 &ifmgd->csa_connection_drop_work);
773 } else {
774 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
775 }
776 }
777 EXPORT_SYMBOL(ieee80211_chswitch_done);
778
779 static void ieee80211_chswitch_timer(unsigned long data)
780 {
781 struct ieee80211_sub_if_data *sdata =
782 (struct ieee80211_sub_if_data *) data;
783 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
784
785 if (sdata->local->quiescing) {
786 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
787 return;
788 }
789
790 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
791 }
792
793 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
794 struct ieee80211_channel_sw_ie *sw_elem,
795 struct ieee80211_bss *bss,
796 u64 timestamp)
797 {
798 struct cfg80211_bss *cbss =
799 container_of((void *)bss, struct cfg80211_bss, priv);
800 struct ieee80211_channel *new_ch;
801 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
802 int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
803 cbss->channel->band);
804 struct ieee80211_chanctx *chanctx;
805
806 ASSERT_MGD_MTX(ifmgd);
807
808 if (!ifmgd->associated)
809 return;
810
811 if (sdata->local->scanning)
812 return;
813
814 /* Disregard subsequent beacons if we are already running a timer
815 processing a CSA */
816
817 if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
818 return;
819
820 new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
821 if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED) {
822 sdata_info(sdata,
823 "AP %pM switches to unsupported channel (%d MHz), disconnecting\n",
824 ifmgd->associated->bssid, new_freq);
825 ieee80211_queue_work(&sdata->local->hw,
826 &ifmgd->csa_connection_drop_work);
827 return;
828 }
829
830 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
831
832 if (sdata->local->use_chanctx) {
833 sdata_info(sdata,
834 "not handling channel switch with channel contexts\n");
835 ieee80211_queue_work(&sdata->local->hw,
836 &ifmgd->csa_connection_drop_work);
837 return;
838 }
839
840 mutex_lock(&sdata->local->chanctx_mtx);
841 if (WARN_ON(!rcu_access_pointer(sdata->vif.chanctx_conf))) {
842 mutex_unlock(&sdata->local->chanctx_mtx);
843 return;
844 }
845 chanctx = container_of(rcu_access_pointer(sdata->vif.chanctx_conf),
846 struct ieee80211_chanctx, conf);
847 if (chanctx->refcount > 1) {
848 sdata_info(sdata,
849 "channel switch with multiple interfaces on the same channel, disconnecting\n");
850 ieee80211_queue_work(&sdata->local->hw,
851 &ifmgd->csa_connection_drop_work);
852 mutex_unlock(&sdata->local->chanctx_mtx);
853 return;
854 }
855 mutex_unlock(&sdata->local->chanctx_mtx);
856
857 sdata->local->csa_channel = new_ch;
858
859 if (sw_elem->mode)
860 ieee80211_stop_queues_by_reason(&sdata->local->hw,
861 IEEE80211_QUEUE_STOP_REASON_CSA);
862
863 if (sdata->local->ops->channel_switch) {
864 /* use driver's channel switch callback */
865 struct ieee80211_channel_switch ch_switch = {
866 .timestamp = timestamp,
867 .block_tx = sw_elem->mode,
868 .channel = new_ch,
869 .count = sw_elem->count,
870 };
871
872 drv_channel_switch(sdata->local, &ch_switch);
873 return;
874 }
875
876 /* channel switch handled in software */
877 if (sw_elem->count <= 1)
878 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
879 else
880 mod_timer(&ifmgd->chswitch_timer,
881 TU_TO_EXP_TIME(sw_elem->count *
882 cbss->beacon_interval));
883 }
884
885 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
886 struct ieee80211_channel *channel,
887 const u8 *country_ie, u8 country_ie_len,
888 const u8 *pwr_constr_elem)
889 {
890 struct ieee80211_country_ie_triplet *triplet;
891 int chan = ieee80211_frequency_to_channel(channel->center_freq);
892 int i, chan_pwr, chan_increment, new_ap_level;
893 bool have_chan_pwr = false;
894
895 /* Invalid IE */
896 if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
897 return 0;
898
899 triplet = (void *)(country_ie + 3);
900 country_ie_len -= 3;
901
902 switch (channel->band) {
903 default:
904 WARN_ON_ONCE(1);
905 /* fall through */
906 case IEEE80211_BAND_2GHZ:
907 case IEEE80211_BAND_60GHZ:
908 chan_increment = 1;
909 break;
910 case IEEE80211_BAND_5GHZ:
911 chan_increment = 4;
912 break;
913 }
914
915 /* find channel */
916 while (country_ie_len >= 3) {
917 u8 first_channel = triplet->chans.first_channel;
918
919 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
920 goto next;
921
922 for (i = 0; i < triplet->chans.num_channels; i++) {
923 if (first_channel + i * chan_increment == chan) {
924 have_chan_pwr = true;
925 chan_pwr = triplet->chans.max_power;
926 break;
927 }
928 }
929 if (have_chan_pwr)
930 break;
931
932 next:
933 triplet++;
934 country_ie_len -= 3;
935 }
936
937 if (!have_chan_pwr)
938 return 0;
939
940 new_ap_level = max_t(int, 0, chan_pwr - *pwr_constr_elem);
941
942 if (sdata->ap_power_level == new_ap_level)
943 return 0;
944
945 sdata_info(sdata,
946 "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
947 new_ap_level, chan_pwr, *pwr_constr_elem,
948 sdata->u.mgd.bssid);
949 sdata->ap_power_level = new_ap_level;
950 if (__ieee80211_recalc_txpower(sdata))
951 return BSS_CHANGED_TXPOWER;
952 return 0;
953 }
954
955 /* powersave */
956 static void ieee80211_enable_ps(struct ieee80211_local *local,
957 struct ieee80211_sub_if_data *sdata)
958 {
959 struct ieee80211_conf *conf = &local->hw.conf;
960
961 /*
962 * If we are scanning right now then the parameters will
963 * take effect when scan finishes.
964 */
965 if (local->scanning)
966 return;
967
968 if (conf->dynamic_ps_timeout > 0 &&
969 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
970 mod_timer(&local->dynamic_ps_timer, jiffies +
971 msecs_to_jiffies(conf->dynamic_ps_timeout));
972 } else {
973 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
974 ieee80211_send_nullfunc(local, sdata, 1);
975
976 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
977 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
978 return;
979
980 conf->flags |= IEEE80211_CONF_PS;
981 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
982 }
983 }
984
985 static void ieee80211_change_ps(struct ieee80211_local *local)
986 {
987 struct ieee80211_conf *conf = &local->hw.conf;
988
989 if (local->ps_sdata) {
990 ieee80211_enable_ps(local, local->ps_sdata);
991 } else if (conf->flags & IEEE80211_CONF_PS) {
992 conf->flags &= ~IEEE80211_CONF_PS;
993 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
994 del_timer_sync(&local->dynamic_ps_timer);
995 cancel_work_sync(&local->dynamic_ps_enable_work);
996 }
997 }
998
999 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1000 {
1001 struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1002 struct sta_info *sta = NULL;
1003 bool authorized = false;
1004
1005 if (!mgd->powersave)
1006 return false;
1007
1008 if (mgd->broken_ap)
1009 return false;
1010
1011 if (!mgd->associated)
1012 return false;
1013
1014 if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
1015 IEEE80211_STA_CONNECTION_POLL))
1016 return false;
1017
1018 rcu_read_lock();
1019 sta = sta_info_get(sdata, mgd->bssid);
1020 if (sta)
1021 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1022 rcu_read_unlock();
1023
1024 return authorized;
1025 }
1026
1027 /* need to hold RTNL or interface lock */
1028 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1029 {
1030 struct ieee80211_sub_if_data *sdata, *found = NULL;
1031 int count = 0;
1032 int timeout;
1033
1034 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
1035 local->ps_sdata = NULL;
1036 return;
1037 }
1038
1039 list_for_each_entry(sdata, &local->interfaces, list) {
1040 if (!ieee80211_sdata_running(sdata))
1041 continue;
1042 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1043 /* If an AP vif is found, then disable PS
1044 * by setting the count to zero thereby setting
1045 * ps_sdata to NULL.
1046 */
1047 count = 0;
1048 break;
1049 }
1050 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1051 continue;
1052 found = sdata;
1053 count++;
1054 }
1055
1056 if (count == 1 && ieee80211_powersave_allowed(found)) {
1057 s32 beaconint_us;
1058
1059 if (latency < 0)
1060 latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1061
1062 beaconint_us = ieee80211_tu_to_usec(
1063 found->vif.bss_conf.beacon_int);
1064
1065 timeout = local->dynamic_ps_forced_timeout;
1066 if (timeout < 0) {
1067 /*
1068 * Go to full PSM if the user configures a very low
1069 * latency requirement.
1070 * The 2000 second value is there for compatibility
1071 * until the PM_QOS_NETWORK_LATENCY is configured
1072 * with real values.
1073 */
1074 if (latency > (1900 * USEC_PER_MSEC) &&
1075 latency != (2000 * USEC_PER_SEC))
1076 timeout = 0;
1077 else
1078 timeout = 100;
1079 }
1080 local->hw.conf.dynamic_ps_timeout = timeout;
1081
1082 if (beaconint_us > latency) {
1083 local->ps_sdata = NULL;
1084 } else {
1085 int maxslp = 1;
1086 u8 dtimper = found->u.mgd.dtim_period;
1087
1088 /* If the TIM IE is invalid, pretend the value is 1 */
1089 if (!dtimper)
1090 dtimper = 1;
1091 else if (dtimper > 1)
1092 maxslp = min_t(int, dtimper,
1093 latency / beaconint_us);
1094
1095 local->hw.conf.max_sleep_period = maxslp;
1096 local->hw.conf.ps_dtim_period = dtimper;
1097 local->ps_sdata = found;
1098 }
1099 } else {
1100 local->ps_sdata = NULL;
1101 }
1102
1103 ieee80211_change_ps(local);
1104 }
1105
1106 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1107 {
1108 bool ps_allowed = ieee80211_powersave_allowed(sdata);
1109
1110 if (sdata->vif.bss_conf.ps != ps_allowed) {
1111 sdata->vif.bss_conf.ps = ps_allowed;
1112 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1113 }
1114 }
1115
1116 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1117 {
1118 struct ieee80211_local *local =
1119 container_of(work, struct ieee80211_local,
1120 dynamic_ps_disable_work);
1121
1122 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1123 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1124 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1125 }
1126
1127 ieee80211_wake_queues_by_reason(&local->hw,
1128 IEEE80211_QUEUE_STOP_REASON_PS);
1129 }
1130
1131 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1132 {
1133 struct ieee80211_local *local =
1134 container_of(work, struct ieee80211_local,
1135 dynamic_ps_enable_work);
1136 struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1137 struct ieee80211_if_managed *ifmgd;
1138 unsigned long flags;
1139 int q;
1140
1141 /* can only happen when PS was just disabled anyway */
1142 if (!sdata)
1143 return;
1144
1145 ifmgd = &sdata->u.mgd;
1146
1147 if (local->hw.conf.flags & IEEE80211_CONF_PS)
1148 return;
1149
1150 if (local->hw.conf.dynamic_ps_timeout > 0) {
1151 /* don't enter PS if TX frames are pending */
1152 if (drv_tx_frames_pending(local)) {
1153 mod_timer(&local->dynamic_ps_timer, jiffies +
1154 msecs_to_jiffies(
1155 local->hw.conf.dynamic_ps_timeout));
1156 return;
1157 }
1158
1159 /*
1160 * transmission can be stopped by others which leads to
1161 * dynamic_ps_timer expiry. Postpone the ps timer if it
1162 * is not the actual idle state.
1163 */
1164 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1165 for (q = 0; q < local->hw.queues; q++) {
1166 if (local->queue_stop_reasons[q]) {
1167 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1168 flags);
1169 mod_timer(&local->dynamic_ps_timer, jiffies +
1170 msecs_to_jiffies(
1171 local->hw.conf.dynamic_ps_timeout));
1172 return;
1173 }
1174 }
1175 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1176 }
1177
1178 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1179 !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1180 netif_tx_stop_all_queues(sdata->dev);
1181
1182 if (drv_tx_frames_pending(local))
1183 mod_timer(&local->dynamic_ps_timer, jiffies +
1184 msecs_to_jiffies(
1185 local->hw.conf.dynamic_ps_timeout));
1186 else {
1187 ieee80211_send_nullfunc(local, sdata, 1);
1188 /* Flush to get the tx status of nullfunc frame */
1189 drv_flush(local, false);
1190 }
1191 }
1192
1193 if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1194 (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1195 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1196 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1197 local->hw.conf.flags |= IEEE80211_CONF_PS;
1198 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1199 }
1200
1201 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1202 netif_tx_wake_all_queues(sdata->dev);
1203 }
1204
1205 void ieee80211_dynamic_ps_timer(unsigned long data)
1206 {
1207 struct ieee80211_local *local = (void *) data;
1208
1209 if (local->quiescing || local->suspended)
1210 return;
1211
1212 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1213 }
1214
1215 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1216 {
1217 struct delayed_work *delayed_work =
1218 container_of(work, struct delayed_work, work);
1219 struct ieee80211_sub_if_data *sdata =
1220 container_of(delayed_work, struct ieee80211_sub_if_data,
1221 dfs_cac_timer_work);
1222
1223 ieee80211_vif_release_channel(sdata);
1224
1225 cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_FINISHED, GFP_KERNEL);
1226 }
1227
1228 /* MLME */
1229 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1230 struct ieee80211_sub_if_data *sdata,
1231 u8 *wmm_param, size_t wmm_param_len)
1232 {
1233 struct ieee80211_tx_queue_params params;
1234 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1235 size_t left;
1236 int count;
1237 u8 *pos, uapsd_queues = 0;
1238
1239 if (!local->ops->conf_tx)
1240 return false;
1241
1242 if (local->hw.queues < IEEE80211_NUM_ACS)
1243 return false;
1244
1245 if (!wmm_param)
1246 return false;
1247
1248 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1249 return false;
1250
1251 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1252 uapsd_queues = ifmgd->uapsd_queues;
1253
1254 count = wmm_param[6] & 0x0f;
1255 if (count == ifmgd->wmm_last_param_set)
1256 return false;
1257 ifmgd->wmm_last_param_set = count;
1258
1259 pos = wmm_param + 8;
1260 left = wmm_param_len - 8;
1261
1262 memset(&params, 0, sizeof(params));
1263
1264 sdata->wmm_acm = 0;
1265 for (; left >= 4; left -= 4, pos += 4) {
1266 int aci = (pos[0] >> 5) & 0x03;
1267 int acm = (pos[0] >> 4) & 0x01;
1268 bool uapsd = false;
1269 int queue;
1270
1271 switch (aci) {
1272 case 1: /* AC_BK */
1273 queue = 3;
1274 if (acm)
1275 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1276 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1277 uapsd = true;
1278 break;
1279 case 2: /* AC_VI */
1280 queue = 1;
1281 if (acm)
1282 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1283 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1284 uapsd = true;
1285 break;
1286 case 3: /* AC_VO */
1287 queue = 0;
1288 if (acm)
1289 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1290 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1291 uapsd = true;
1292 break;
1293 case 0: /* AC_BE */
1294 default:
1295 queue = 2;
1296 if (acm)
1297 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1298 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1299 uapsd = true;
1300 break;
1301 }
1302
1303 params.aifs = pos[0] & 0x0f;
1304 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1305 params.cw_min = ecw2cw(pos[1] & 0x0f);
1306 params.txop = get_unaligned_le16(pos + 2);
1307 params.uapsd = uapsd;
1308
1309 mlme_dbg(sdata,
1310 "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1311 queue, aci, acm,
1312 params.aifs, params.cw_min, params.cw_max,
1313 params.txop, params.uapsd);
1314 sdata->tx_conf[queue] = params;
1315 if (drv_conf_tx(local, sdata, queue, &params))
1316 sdata_err(sdata,
1317 "failed to set TX queue parameters for queue %d\n",
1318 queue);
1319 }
1320
1321 /* enable WMM or activate new settings */
1322 sdata->vif.bss_conf.qos = true;
1323 return true;
1324 }
1325
1326 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1327 {
1328 lockdep_assert_held(&sdata->local->mtx);
1329
1330 sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1331 IEEE80211_STA_BEACON_POLL);
1332 ieee80211_run_deferred_scan(sdata->local);
1333 }
1334
1335 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1336 {
1337 mutex_lock(&sdata->local->mtx);
1338 __ieee80211_stop_poll(sdata);
1339 mutex_unlock(&sdata->local->mtx);
1340 }
1341
1342 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1343 u16 capab, bool erp_valid, u8 erp)
1344 {
1345 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1346 u32 changed = 0;
1347 bool use_protection;
1348 bool use_short_preamble;
1349 bool use_short_slot;
1350
1351 if (erp_valid) {
1352 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1353 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1354 } else {
1355 use_protection = false;
1356 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1357 }
1358
1359 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1360 if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1361 use_short_slot = true;
1362
1363 if (use_protection != bss_conf->use_cts_prot) {
1364 bss_conf->use_cts_prot = use_protection;
1365 changed |= BSS_CHANGED_ERP_CTS_PROT;
1366 }
1367
1368 if (use_short_preamble != bss_conf->use_short_preamble) {
1369 bss_conf->use_short_preamble = use_short_preamble;
1370 changed |= BSS_CHANGED_ERP_PREAMBLE;
1371 }
1372
1373 if (use_short_slot != bss_conf->use_short_slot) {
1374 bss_conf->use_short_slot = use_short_slot;
1375 changed |= BSS_CHANGED_ERP_SLOT;
1376 }
1377
1378 return changed;
1379 }
1380
1381 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1382 struct cfg80211_bss *cbss,
1383 u32 bss_info_changed)
1384 {
1385 struct ieee80211_bss *bss = (void *)cbss->priv;
1386 struct ieee80211_local *local = sdata->local;
1387 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1388
1389 bss_info_changed |= BSS_CHANGED_ASSOC;
1390 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1391 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1392
1393 sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1394 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
1395
1396 sdata->u.mgd.associated = cbss;
1397 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1398
1399 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1400
1401 if (sdata->vif.p2p) {
1402 const struct cfg80211_bss_ies *ies;
1403
1404 rcu_read_lock();
1405 ies = rcu_dereference(cbss->ies);
1406 if (ies) {
1407 u8 noa[2];
1408 int ret;
1409
1410 ret = cfg80211_get_p2p_attr(
1411 ies->data, ies->len,
1412 IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1413 noa, sizeof(noa));
1414 if (ret >= 2) {
1415 bss_conf->p2p_oppps = noa[1] & 0x80;
1416 bss_conf->p2p_ctwindow = noa[1] & 0x7f;
1417 bss_info_changed |= BSS_CHANGED_P2P_PS;
1418 sdata->u.mgd.p2p_noa_index = noa[0];
1419 }
1420 }
1421 rcu_read_unlock();
1422 }
1423
1424 /* just to be sure */
1425 ieee80211_stop_poll(sdata);
1426
1427 ieee80211_led_assoc(local, 1);
1428
1429 if (sdata->u.mgd.assoc_data->have_beacon) {
1430 /*
1431 * If the AP is buggy we may get here with no DTIM period
1432 * known, so assume it's 1 which is the only safe assumption
1433 * in that case, although if the TIM IE is broken powersave
1434 * probably just won't work at all.
1435 */
1436 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1437 bss_info_changed |= BSS_CHANGED_DTIM_PERIOD;
1438 } else {
1439 bss_conf->dtim_period = 0;
1440 }
1441
1442 bss_conf->assoc = 1;
1443
1444 /* Tell the driver to monitor connection quality (if supported) */
1445 if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1446 bss_conf->cqm_rssi_thold)
1447 bss_info_changed |= BSS_CHANGED_CQM;
1448
1449 /* Enable ARP filtering */
1450 if (bss_conf->arp_addr_cnt)
1451 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1452
1453 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1454
1455 mutex_lock(&local->iflist_mtx);
1456 ieee80211_recalc_ps(local, -1);
1457 mutex_unlock(&local->iflist_mtx);
1458
1459 ieee80211_recalc_smps(sdata);
1460 ieee80211_recalc_ps_vif(sdata);
1461
1462 netif_tx_start_all_queues(sdata->dev);
1463 netif_carrier_on(sdata->dev);
1464 }
1465
1466 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1467 u16 stype, u16 reason, bool tx,
1468 u8 *frame_buf)
1469 {
1470 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1471 struct ieee80211_local *local = sdata->local;
1472 u32 changed = 0;
1473
1474 ASSERT_MGD_MTX(ifmgd);
1475
1476 if (WARN_ON_ONCE(tx && !frame_buf))
1477 return;
1478
1479 if (WARN_ON(!ifmgd->associated))
1480 return;
1481
1482 ieee80211_stop_poll(sdata);
1483
1484 ifmgd->associated = NULL;
1485
1486 /*
1487 * we need to commit the associated = NULL change because the
1488 * scan code uses that to determine whether this iface should
1489 * go to/wake up from powersave or not -- and could otherwise
1490 * wake the queues erroneously.
1491 */
1492 smp_mb();
1493
1494 /*
1495 * Thus, we can only afterwards stop the queues -- to account
1496 * for the case where another CPU is finishing a scan at this
1497 * time -- we don't want the scan code to enable queues.
1498 */
1499
1500 netif_tx_stop_all_queues(sdata->dev);
1501 netif_carrier_off(sdata->dev);
1502
1503 /*
1504 * if we want to get out of ps before disassoc (why?) we have
1505 * to do it before sending disassoc, as otherwise the null-packet
1506 * won't be valid.
1507 */
1508 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1509 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1510 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1511 }
1512 local->ps_sdata = NULL;
1513
1514 /* disable per-vif ps */
1515 ieee80211_recalc_ps_vif(sdata);
1516
1517 /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
1518 if (tx)
1519 drv_flush(local, false);
1520
1521 /* deauthenticate/disassociate now */
1522 if (tx || frame_buf)
1523 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
1524 reason, tx, frame_buf);
1525
1526 /* flush out frame */
1527 if (tx)
1528 drv_flush(local, false);
1529
1530 /* clear bssid only after building the needed mgmt frames */
1531 memset(ifmgd->bssid, 0, ETH_ALEN);
1532
1533 /* remove AP and TDLS peers */
1534 sta_info_flush_defer(sdata);
1535
1536 /* finally reset all BSS / config parameters */
1537 changed |= ieee80211_reset_erp_info(sdata);
1538
1539 ieee80211_led_assoc(local, 0);
1540 changed |= BSS_CHANGED_ASSOC;
1541 sdata->vif.bss_conf.assoc = false;
1542
1543 sdata->vif.bss_conf.p2p_ctwindow = 0;
1544 sdata->vif.bss_conf.p2p_oppps = false;
1545
1546 /* on the next assoc, re-program HT parameters */
1547 memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1548 memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1549
1550 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1551
1552 del_timer_sync(&local->dynamic_ps_timer);
1553 cancel_work_sync(&local->dynamic_ps_enable_work);
1554
1555 /* Disable ARP filtering */
1556 if (sdata->vif.bss_conf.arp_addr_cnt)
1557 changed |= BSS_CHANGED_ARP_FILTER;
1558
1559 sdata->vif.bss_conf.qos = false;
1560 changed |= BSS_CHANGED_QOS;
1561
1562 /* The BSSID (not really interesting) and HT changed */
1563 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1564 ieee80211_bss_info_change_notify(sdata, changed);
1565
1566 /* disassociated - set to defaults now */
1567 ieee80211_set_wmm_default(sdata, false);
1568
1569 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1570 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1571 del_timer_sync(&sdata->u.mgd.timer);
1572 del_timer_sync(&sdata->u.mgd.chswitch_timer);
1573
1574 sdata->u.mgd.timers_running = 0;
1575
1576 sdata->vif.bss_conf.dtim_period = 0;
1577
1578 ifmgd->flags = 0;
1579 ieee80211_vif_release_channel(sdata);
1580 }
1581
1582 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1583 struct ieee80211_hdr *hdr)
1584 {
1585 /*
1586 * We can postpone the mgd.timer whenever receiving unicast frames
1587 * from AP because we know that the connection is working both ways
1588 * at that time. But multicast frames (and hence also beacons) must
1589 * be ignored here, because we need to trigger the timer during
1590 * data idle periods for sending the periodic probe request to the
1591 * AP we're connected to.
1592 */
1593 if (is_multicast_ether_addr(hdr->addr1))
1594 return;
1595
1596 ieee80211_sta_reset_conn_monitor(sdata);
1597 }
1598
1599 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1600 {
1601 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1602 struct ieee80211_local *local = sdata->local;
1603
1604 mutex_lock(&local->mtx);
1605 if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1606 IEEE80211_STA_CONNECTION_POLL))) {
1607 mutex_unlock(&local->mtx);
1608 return;
1609 }
1610
1611 __ieee80211_stop_poll(sdata);
1612
1613 mutex_lock(&local->iflist_mtx);
1614 ieee80211_recalc_ps(local, -1);
1615 mutex_unlock(&local->iflist_mtx);
1616
1617 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1618 goto out;
1619
1620 /*
1621 * We've received a probe response, but are not sure whether
1622 * we have or will be receiving any beacons or data, so let's
1623 * schedule the timers again, just in case.
1624 */
1625 ieee80211_sta_reset_beacon_monitor(sdata);
1626
1627 mod_timer(&ifmgd->conn_mon_timer,
1628 round_jiffies_up(jiffies +
1629 IEEE80211_CONNECTION_IDLE_TIME));
1630 out:
1631 mutex_unlock(&local->mtx);
1632 }
1633
1634 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1635 struct ieee80211_hdr *hdr, bool ack)
1636 {
1637 if (!ieee80211_is_data(hdr->frame_control))
1638 return;
1639
1640 if (ieee80211_is_nullfunc(hdr->frame_control) &&
1641 sdata->u.mgd.probe_send_count > 0) {
1642 if (ack)
1643 ieee80211_sta_reset_conn_monitor(sdata);
1644 else
1645 sdata->u.mgd.nullfunc_failed = true;
1646 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1647 return;
1648 }
1649
1650 if (ack)
1651 ieee80211_sta_reset_conn_monitor(sdata);
1652 }
1653
1654 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1655 {
1656 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1657 const u8 *ssid;
1658 u8 *dst = ifmgd->associated->bssid;
1659 u8 unicast_limit = max(1, max_probe_tries - 3);
1660
1661 /*
1662 * Try sending broadcast probe requests for the last three
1663 * probe requests after the first ones failed since some
1664 * buggy APs only support broadcast probe requests.
1665 */
1666 if (ifmgd->probe_send_count >= unicast_limit)
1667 dst = NULL;
1668
1669 /*
1670 * When the hardware reports an accurate Tx ACK status, it's
1671 * better to send a nullfunc frame instead of a probe request,
1672 * as it will kick us off the AP quickly if we aren't associated
1673 * anymore. The timeout will be reset if the frame is ACKed by
1674 * the AP.
1675 */
1676 ifmgd->probe_send_count++;
1677
1678 if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1679 ifmgd->nullfunc_failed = false;
1680 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1681 } else {
1682 int ssid_len;
1683
1684 rcu_read_lock();
1685 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1686 if (WARN_ON_ONCE(ssid == NULL))
1687 ssid_len = 0;
1688 else
1689 ssid_len = ssid[1];
1690
1691 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
1692 0, (u32) -1, true, 0,
1693 ifmgd->associated->channel, false);
1694 rcu_read_unlock();
1695 }
1696
1697 ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1698 run_again(ifmgd, ifmgd->probe_timeout);
1699 if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
1700 drv_flush(sdata->local, false);
1701 }
1702
1703 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1704 bool beacon)
1705 {
1706 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1707 bool already = false;
1708
1709 if (!ieee80211_sdata_running(sdata))
1710 return;
1711
1712 mutex_lock(&ifmgd->mtx);
1713
1714 if (!ifmgd->associated)
1715 goto out;
1716
1717 mutex_lock(&sdata->local->mtx);
1718
1719 if (sdata->local->tmp_channel || sdata->local->scanning) {
1720 mutex_unlock(&sdata->local->mtx);
1721 goto out;
1722 }
1723
1724 if (beacon)
1725 mlme_dbg_ratelimited(sdata,
1726 "detected beacon loss from AP - probing\n");
1727
1728 ieee80211_cqm_rssi_notify(&sdata->vif,
1729 NL80211_CQM_RSSI_BEACON_LOSS_EVENT, GFP_KERNEL);
1730
1731 /*
1732 * The driver/our work has already reported this event or the
1733 * connection monitoring has kicked in and we have already sent
1734 * a probe request. Or maybe the AP died and the driver keeps
1735 * reporting until we disassociate...
1736 *
1737 * In either case we have to ignore the current call to this
1738 * function (except for setting the correct probe reason bit)
1739 * because otherwise we would reset the timer every time and
1740 * never check whether we received a probe response!
1741 */
1742 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1743 IEEE80211_STA_CONNECTION_POLL))
1744 already = true;
1745
1746 if (beacon)
1747 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1748 else
1749 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1750
1751 mutex_unlock(&sdata->local->mtx);
1752
1753 if (already)
1754 goto out;
1755
1756 mutex_lock(&sdata->local->iflist_mtx);
1757 ieee80211_recalc_ps(sdata->local, -1);
1758 mutex_unlock(&sdata->local->iflist_mtx);
1759
1760 ifmgd->probe_send_count = 0;
1761 ieee80211_mgd_probe_ap_send(sdata);
1762 out:
1763 mutex_unlock(&ifmgd->mtx);
1764 }
1765
1766 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1767 struct ieee80211_vif *vif)
1768 {
1769 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1770 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1771 struct cfg80211_bss *cbss;
1772 struct sk_buff *skb;
1773 const u8 *ssid;
1774 int ssid_len;
1775
1776 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1777 return NULL;
1778
1779 ASSERT_MGD_MTX(ifmgd);
1780
1781 if (ifmgd->associated)
1782 cbss = ifmgd->associated;
1783 else if (ifmgd->auth_data)
1784 cbss = ifmgd->auth_data->bss;
1785 else if (ifmgd->assoc_data)
1786 cbss = ifmgd->assoc_data->bss;
1787 else
1788 return NULL;
1789
1790 rcu_read_lock();
1791 ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
1792 if (WARN_ON_ONCE(ssid == NULL))
1793 ssid_len = 0;
1794 else
1795 ssid_len = ssid[1];
1796
1797 skb = ieee80211_build_probe_req(sdata, cbss->bssid,
1798 (u32) -1, cbss->channel,
1799 ssid + 2, ssid_len,
1800 NULL, 0, true);
1801 rcu_read_unlock();
1802
1803 return skb;
1804 }
1805 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1806
1807 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
1808 {
1809 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1810 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
1811
1812 mutex_lock(&ifmgd->mtx);
1813 if (!ifmgd->associated) {
1814 mutex_unlock(&ifmgd->mtx);
1815 return;
1816 }
1817
1818 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
1819 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1820 true, frame_buf);
1821 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
1822 ieee80211_wake_queues_by_reason(&sdata->local->hw,
1823 IEEE80211_QUEUE_STOP_REASON_CSA);
1824 mutex_unlock(&ifmgd->mtx);
1825
1826 /*
1827 * must be outside lock due to cfg80211,
1828 * but that's not a problem.
1829 */
1830 cfg80211_send_deauth(sdata->dev, frame_buf, IEEE80211_DEAUTH_FRAME_LEN);
1831 }
1832
1833 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1834 {
1835 struct ieee80211_sub_if_data *sdata =
1836 container_of(work, struct ieee80211_sub_if_data,
1837 u.mgd.beacon_connection_loss_work);
1838 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1839 struct sta_info *sta;
1840
1841 if (ifmgd->associated) {
1842 rcu_read_lock();
1843 sta = sta_info_get(sdata, ifmgd->bssid);
1844 if (sta)
1845 sta->beacon_loss_count++;
1846 rcu_read_unlock();
1847 }
1848
1849 if (ifmgd->connection_loss) {
1850 sdata_info(sdata, "Connection to AP %pM lost\n",
1851 ifmgd->bssid);
1852 __ieee80211_disconnect(sdata);
1853 } else {
1854 ieee80211_mgd_probe_ap(sdata, true);
1855 }
1856 }
1857
1858 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
1859 {
1860 struct ieee80211_sub_if_data *sdata =
1861 container_of(work, struct ieee80211_sub_if_data,
1862 u.mgd.csa_connection_drop_work);
1863
1864 __ieee80211_disconnect(sdata);
1865 }
1866
1867 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1868 {
1869 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1870 struct ieee80211_hw *hw = &sdata->local->hw;
1871
1872 trace_api_beacon_loss(sdata);
1873
1874 WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1875 sdata->u.mgd.connection_loss = false;
1876 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1877 }
1878 EXPORT_SYMBOL(ieee80211_beacon_loss);
1879
1880 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1881 {
1882 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1883 struct ieee80211_hw *hw = &sdata->local->hw;
1884
1885 trace_api_connection_loss(sdata);
1886
1887 sdata->u.mgd.connection_loss = true;
1888 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1889 }
1890 EXPORT_SYMBOL(ieee80211_connection_loss);
1891
1892
1893 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
1894 bool assoc)
1895 {
1896 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1897
1898 lockdep_assert_held(&sdata->u.mgd.mtx);
1899
1900 if (!assoc) {
1901 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
1902
1903 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1904 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1905 sdata->u.mgd.flags = 0;
1906 ieee80211_vif_release_channel(sdata);
1907 }
1908
1909 cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
1910 kfree(auth_data);
1911 sdata->u.mgd.auth_data = NULL;
1912 }
1913
1914 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1915 struct ieee80211_mgmt *mgmt, size_t len)
1916 {
1917 struct ieee80211_local *local = sdata->local;
1918 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1919 u8 *pos;
1920 struct ieee802_11_elems elems;
1921 u32 tx_flags = 0;
1922
1923 pos = mgmt->u.auth.variable;
1924 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1925 if (!elems.challenge)
1926 return;
1927 auth_data->expected_transaction = 4;
1928 drv_mgd_prepare_tx(sdata->local, sdata);
1929 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
1930 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1931 IEEE80211_TX_INTFL_MLME_CONN_TX;
1932 ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
1933 elems.challenge - 2, elems.challenge_len + 2,
1934 auth_data->bss->bssid, auth_data->bss->bssid,
1935 auth_data->key, auth_data->key_len,
1936 auth_data->key_idx, tx_flags);
1937 }
1938
1939 static enum rx_mgmt_action __must_check
1940 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1941 struct ieee80211_mgmt *mgmt, size_t len)
1942 {
1943 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1944 u8 bssid[ETH_ALEN];
1945 u16 auth_alg, auth_transaction, status_code;
1946 struct sta_info *sta;
1947
1948 lockdep_assert_held(&ifmgd->mtx);
1949
1950 if (len < 24 + 6)
1951 return RX_MGMT_NONE;
1952
1953 if (!ifmgd->auth_data || ifmgd->auth_data->done)
1954 return RX_MGMT_NONE;
1955
1956 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
1957
1958 if (!ether_addr_equal(bssid, mgmt->bssid))
1959 return RX_MGMT_NONE;
1960
1961 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1962 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1963 status_code = le16_to_cpu(mgmt->u.auth.status_code);
1964
1965 if (auth_alg != ifmgd->auth_data->algorithm ||
1966 auth_transaction != ifmgd->auth_data->expected_transaction) {
1967 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
1968 mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
1969 auth_transaction,
1970 ifmgd->auth_data->expected_transaction);
1971 return RX_MGMT_NONE;
1972 }
1973
1974 if (status_code != WLAN_STATUS_SUCCESS) {
1975 sdata_info(sdata, "%pM denied authentication (status %d)\n",
1976 mgmt->sa, status_code);
1977 ieee80211_destroy_auth_data(sdata, false);
1978 return RX_MGMT_CFG80211_RX_AUTH;
1979 }
1980
1981 switch (ifmgd->auth_data->algorithm) {
1982 case WLAN_AUTH_OPEN:
1983 case WLAN_AUTH_LEAP:
1984 case WLAN_AUTH_FT:
1985 case WLAN_AUTH_SAE:
1986 break;
1987 case WLAN_AUTH_SHARED_KEY:
1988 if (ifmgd->auth_data->expected_transaction != 4) {
1989 ieee80211_auth_challenge(sdata, mgmt, len);
1990 /* need another frame */
1991 return RX_MGMT_NONE;
1992 }
1993 break;
1994 default:
1995 WARN_ONCE(1, "invalid auth alg %d",
1996 ifmgd->auth_data->algorithm);
1997 return RX_MGMT_NONE;
1998 }
1999
2000 sdata_info(sdata, "authenticated\n");
2001 ifmgd->auth_data->done = true;
2002 ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2003 ifmgd->auth_data->timeout_started = true;
2004 run_again(ifmgd, ifmgd->auth_data->timeout);
2005
2006 if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2007 ifmgd->auth_data->expected_transaction != 2) {
2008 /*
2009 * Report auth frame to user space for processing since another
2010 * round of Authentication frames is still needed.
2011 */
2012 return RX_MGMT_CFG80211_RX_AUTH;
2013 }
2014
2015 /* move station state to auth */
2016 mutex_lock(&sdata->local->sta_mtx);
2017 sta = sta_info_get(sdata, bssid);
2018 if (!sta) {
2019 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2020 goto out_err;
2021 }
2022 if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2023 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2024 goto out_err;
2025 }
2026 mutex_unlock(&sdata->local->sta_mtx);
2027
2028 return RX_MGMT_CFG80211_RX_AUTH;
2029 out_err:
2030 mutex_unlock(&sdata->local->sta_mtx);
2031 /* ignore frame -- wait for timeout */
2032 return RX_MGMT_NONE;
2033 }
2034
2035
2036 static enum rx_mgmt_action __must_check
2037 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2038 struct ieee80211_mgmt *mgmt, size_t len)
2039 {
2040 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2041 const u8 *bssid = NULL;
2042 u16 reason_code;
2043
2044 lockdep_assert_held(&ifmgd->mtx);
2045
2046 if (len < 24 + 2)
2047 return RX_MGMT_NONE;
2048
2049 if (!ifmgd->associated ||
2050 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2051 return RX_MGMT_NONE;
2052
2053 bssid = ifmgd->associated->bssid;
2054
2055 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2056
2057 sdata_info(sdata, "deauthenticated from %pM (Reason: %u)\n",
2058 bssid, reason_code);
2059
2060 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2061
2062 return RX_MGMT_CFG80211_DEAUTH;
2063 }
2064
2065
2066 static enum rx_mgmt_action __must_check
2067 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2068 struct ieee80211_mgmt *mgmt, size_t len)
2069 {
2070 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2071 u16 reason_code;
2072
2073 lockdep_assert_held(&ifmgd->mtx);
2074
2075 if (len < 24 + 2)
2076 return RX_MGMT_NONE;
2077
2078 if (!ifmgd->associated ||
2079 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2080 return RX_MGMT_NONE;
2081
2082 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2083
2084 sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2085 mgmt->sa, reason_code);
2086
2087 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2088
2089 return RX_MGMT_CFG80211_DISASSOC;
2090 }
2091
2092 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2093 u8 *supp_rates, unsigned int supp_rates_len,
2094 u32 *rates, u32 *basic_rates,
2095 bool *have_higher_than_11mbit,
2096 int *min_rate, int *min_rate_index)
2097 {
2098 int i, j;
2099
2100 for (i = 0; i < supp_rates_len; i++) {
2101 int rate = (supp_rates[i] & 0x7f) * 5;
2102 bool is_basic = !!(supp_rates[i] & 0x80);
2103
2104 if (rate > 110)
2105 *have_higher_than_11mbit = true;
2106
2107 /*
2108 * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2109 * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2110 *
2111 * Note: Even through the membership selector and the basic
2112 * rate flag share the same bit, they are not exactly
2113 * the same.
2114 */
2115 if (!!(supp_rates[i] & 0x80) &&
2116 (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2117 continue;
2118
2119 for (j = 0; j < sband->n_bitrates; j++) {
2120 if (sband->bitrates[j].bitrate == rate) {
2121 *rates |= BIT(j);
2122 if (is_basic)
2123 *basic_rates |= BIT(j);
2124 if (rate < *min_rate) {
2125 *min_rate = rate;
2126 *min_rate_index = j;
2127 }
2128 break;
2129 }
2130 }
2131 }
2132 }
2133
2134 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2135 bool assoc)
2136 {
2137 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2138
2139 lockdep_assert_held(&sdata->u.mgd.mtx);
2140
2141 if (!assoc) {
2142 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2143
2144 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2145 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2146 sdata->u.mgd.flags = 0;
2147 ieee80211_vif_release_channel(sdata);
2148 }
2149
2150 kfree(assoc_data);
2151 sdata->u.mgd.assoc_data = NULL;
2152 }
2153
2154 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2155 struct cfg80211_bss *cbss,
2156 struct ieee80211_mgmt *mgmt, size_t len)
2157 {
2158 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2159 struct ieee80211_local *local = sdata->local;
2160 struct ieee80211_supported_band *sband;
2161 struct sta_info *sta;
2162 u8 *pos;
2163 u16 capab_info, aid;
2164 struct ieee802_11_elems elems;
2165 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2166 u32 changed = 0;
2167 int err;
2168
2169 /* AssocResp and ReassocResp have identical structure */
2170
2171 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2172 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2173
2174 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2175 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2176 aid);
2177 aid &= ~(BIT(15) | BIT(14));
2178
2179 ifmgd->broken_ap = false;
2180
2181 if (aid == 0 || aid > IEEE80211_MAX_AID) {
2182 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2183 aid);
2184 aid = 0;
2185 ifmgd->broken_ap = true;
2186 }
2187
2188 pos = mgmt->u.assoc_resp.variable;
2189 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2190
2191 if (!elems.supp_rates) {
2192 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2193 return false;
2194 }
2195
2196 ifmgd->aid = aid;
2197
2198 mutex_lock(&sdata->local->sta_mtx);
2199 /*
2200 * station info was already allocated and inserted before
2201 * the association and should be available to us
2202 */
2203 sta = sta_info_get(sdata, cbss->bssid);
2204 if (WARN_ON(!sta)) {
2205 mutex_unlock(&sdata->local->sta_mtx);
2206 return false;
2207 }
2208
2209 sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2210
2211 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2212 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2213 elems.ht_cap_elem, &sta->sta.ht_cap);
2214
2215 sta->supports_40mhz =
2216 sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40;
2217
2218 if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
2219 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2220 elems.vht_cap_elem, sta);
2221
2222 rate_control_rate_init(sta);
2223
2224 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2225 set_sta_flag(sta, WLAN_STA_MFP);
2226
2227 if (elems.wmm_param)
2228 set_sta_flag(sta, WLAN_STA_WME);
2229
2230 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2231 if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2232 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2233 if (err) {
2234 sdata_info(sdata,
2235 "failed to move station %pM to desired state\n",
2236 sta->sta.addr);
2237 WARN_ON(__sta_info_destroy(sta));
2238 mutex_unlock(&sdata->local->sta_mtx);
2239 return false;
2240 }
2241
2242 mutex_unlock(&sdata->local->sta_mtx);
2243
2244 /*
2245 * Always handle WMM once after association regardless
2246 * of the first value the AP uses. Setting -1 here has
2247 * that effect because the AP values is an unsigned
2248 * 4-bit value.
2249 */
2250 ifmgd->wmm_last_param_set = -1;
2251
2252 if (elems.wmm_param)
2253 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2254 elems.wmm_param_len);
2255 else
2256 ieee80211_set_wmm_default(sdata, false);
2257 changed |= BSS_CHANGED_QOS;
2258
2259 if (elems.ht_operation && elems.wmm_param &&
2260 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2261 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2262 cbss->bssid, false);
2263
2264 /* set AID and assoc capability,
2265 * ieee80211_set_associated() will tell the driver */
2266 bss_conf->aid = aid;
2267 bss_conf->assoc_capability = capab_info;
2268 ieee80211_set_associated(sdata, cbss, changed);
2269
2270 /*
2271 * If we're using 4-addr mode, let the AP know that we're
2272 * doing so, so that it can create the STA VLAN on its side
2273 */
2274 if (ifmgd->use_4addr)
2275 ieee80211_send_4addr_nullfunc(local, sdata);
2276
2277 /*
2278 * Start timer to probe the connection to the AP now.
2279 * Also start the timer that will detect beacon loss.
2280 */
2281 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2282 ieee80211_sta_reset_beacon_monitor(sdata);
2283
2284 return true;
2285 }
2286
2287 static enum rx_mgmt_action __must_check
2288 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2289 struct ieee80211_mgmt *mgmt, size_t len,
2290 struct cfg80211_bss **bss)
2291 {
2292 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2293 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2294 u16 capab_info, status_code, aid;
2295 struct ieee802_11_elems elems;
2296 u8 *pos;
2297 bool reassoc;
2298
2299 lockdep_assert_held(&ifmgd->mtx);
2300
2301 if (!assoc_data)
2302 return RX_MGMT_NONE;
2303 if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2304 return RX_MGMT_NONE;
2305
2306 /*
2307 * AssocResp and ReassocResp have identical structure, so process both
2308 * of them in this function.
2309 */
2310
2311 if (len < 24 + 6)
2312 return RX_MGMT_NONE;
2313
2314 reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2315 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2316 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2317 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2318
2319 sdata_info(sdata,
2320 "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
2321 reassoc ? "Rea" : "A", mgmt->sa,
2322 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2323
2324 pos = mgmt->u.assoc_resp.variable;
2325 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2326
2327 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2328 elems.timeout_int && elems.timeout_int_len == 5 &&
2329 elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2330 u32 tu, ms;
2331 tu = get_unaligned_le32(elems.timeout_int + 1);
2332 ms = tu * 1024 / 1000;
2333 sdata_info(sdata,
2334 "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
2335 mgmt->sa, tu, ms);
2336 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2337 assoc_data->timeout_started = true;
2338 if (ms > IEEE80211_ASSOC_TIMEOUT)
2339 run_again(ifmgd, assoc_data->timeout);
2340 return RX_MGMT_NONE;
2341 }
2342
2343 *bss = assoc_data->bss;
2344
2345 if (status_code != WLAN_STATUS_SUCCESS) {
2346 sdata_info(sdata, "%pM denied association (code=%d)\n",
2347 mgmt->sa, status_code);
2348 ieee80211_destroy_assoc_data(sdata, false);
2349 } else {
2350 if (!ieee80211_assoc_success(sdata, *bss, mgmt, len)) {
2351 /* oops -- internal error -- send timeout for now */
2352 ieee80211_destroy_assoc_data(sdata, false);
2353 cfg80211_put_bss(sdata->local->hw.wiphy, *bss);
2354 return RX_MGMT_CFG80211_ASSOC_TIMEOUT;
2355 }
2356 sdata_info(sdata, "associated\n");
2357
2358 /*
2359 * destroy assoc_data afterwards, as otherwise an idle
2360 * recalc after assoc_data is NULL but before associated
2361 * is set can cause the interface to go idle
2362 */
2363 ieee80211_destroy_assoc_data(sdata, true);
2364 }
2365
2366 return RX_MGMT_CFG80211_RX_ASSOC;
2367 }
2368
2369 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2370 struct ieee80211_mgmt *mgmt, size_t len,
2371 struct ieee80211_rx_status *rx_status,
2372 struct ieee802_11_elems *elems)
2373 {
2374 struct ieee80211_local *local = sdata->local;
2375 int freq;
2376 struct ieee80211_bss *bss;
2377 struct ieee80211_channel *channel;
2378 bool need_ps = false;
2379
2380 if ((sdata->u.mgd.associated &&
2381 ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid)) ||
2382 (sdata->u.mgd.assoc_data &&
2383 ether_addr_equal(mgmt->bssid,
2384 sdata->u.mgd.assoc_data->bss->bssid))) {
2385 /* not previously set so we may need to recalc */
2386 need_ps = sdata->u.mgd.associated && !sdata->u.mgd.dtim_period;
2387
2388 if (elems->tim && !elems->parse_error) {
2389 struct ieee80211_tim_ie *tim_ie = elems->tim;
2390 sdata->u.mgd.dtim_period = tim_ie->dtim_period;
2391 }
2392 }
2393
2394 if (elems->ds_params && elems->ds_params_len == 1)
2395 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
2396 rx_status->band);
2397 else
2398 freq = rx_status->freq;
2399
2400 channel = ieee80211_get_channel(local->hw.wiphy, freq);
2401
2402 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2403 return;
2404
2405 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2406 channel);
2407 if (bss)
2408 ieee80211_rx_bss_put(local, bss);
2409
2410 if (!sdata->u.mgd.associated)
2411 return;
2412
2413 if (need_ps) {
2414 mutex_lock(&local->iflist_mtx);
2415 ieee80211_recalc_ps(local, -1);
2416 mutex_unlock(&local->iflist_mtx);
2417 }
2418
2419 if (elems->ch_switch_ie &&
2420 memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid, ETH_ALEN) == 0)
2421 ieee80211_sta_process_chanswitch(sdata, elems->ch_switch_ie,
2422 bss, rx_status->mactime);
2423 }
2424
2425
2426 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2427 struct sk_buff *skb)
2428 {
2429 struct ieee80211_mgmt *mgmt = (void *)skb->data;
2430 struct ieee80211_if_managed *ifmgd;
2431 struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2432 size_t baselen, len = skb->len;
2433 struct ieee802_11_elems elems;
2434
2435 ifmgd = &sdata->u.mgd;
2436
2437 ASSERT_MGD_MTX(ifmgd);
2438
2439 if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2440 return; /* ignore ProbeResp to foreign address */
2441
2442 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2443 if (baselen > len)
2444 return;
2445
2446 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2447 &elems);
2448
2449 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2450
2451 if (ifmgd->associated &&
2452 ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2453 ieee80211_reset_ap_probe(sdata);
2454
2455 if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2456 ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
2457 /* got probe response, continue with auth */
2458 sdata_info(sdata, "direct probe responded\n");
2459 ifmgd->auth_data->tries = 0;
2460 ifmgd->auth_data->timeout = jiffies;
2461 ifmgd->auth_data->timeout_started = true;
2462 run_again(ifmgd, ifmgd->auth_data->timeout);
2463 }
2464 }
2465
2466 /*
2467 * This is the canonical list of information elements we care about,
2468 * the filter code also gives us all changes to the Microsoft OUI
2469 * (00:50:F2) vendor IE which is used for WMM which we need to track.
2470 *
2471 * We implement beacon filtering in software since that means we can
2472 * avoid processing the frame here and in cfg80211, and userspace
2473 * will not be able to tell whether the hardware supports it or not.
2474 *
2475 * XXX: This list needs to be dynamic -- userspace needs to be able to
2476 * add items it requires. It also needs to be able to tell us to
2477 * look out for other vendor IEs.
2478 */
2479 static const u64 care_about_ies =
2480 (1ULL << WLAN_EID_COUNTRY) |
2481 (1ULL << WLAN_EID_ERP_INFO) |
2482 (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2483 (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2484 (1ULL << WLAN_EID_HT_CAPABILITY) |
2485 (1ULL << WLAN_EID_HT_OPERATION);
2486
2487 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2488 struct ieee80211_mgmt *mgmt,
2489 size_t len,
2490 struct ieee80211_rx_status *rx_status)
2491 {
2492 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2493 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2494 size_t baselen;
2495 struct ieee802_11_elems elems;
2496 struct ieee80211_local *local = sdata->local;
2497 struct ieee80211_chanctx_conf *chanctx_conf;
2498 struct ieee80211_channel *chan;
2499 u32 changed = 0;
2500 bool erp_valid;
2501 u8 erp_value = 0;
2502 u32 ncrc;
2503 u8 *bssid;
2504
2505 lockdep_assert_held(&ifmgd->mtx);
2506
2507 /* Process beacon from the current BSS */
2508 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2509 if (baselen > len)
2510 return;
2511
2512 rcu_read_lock();
2513 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2514 if (!chanctx_conf) {
2515 rcu_read_unlock();
2516 return;
2517 }
2518
2519 if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
2520 rcu_read_unlock();
2521 return;
2522 }
2523 chan = chanctx_conf->def.chan;
2524 rcu_read_unlock();
2525
2526 if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
2527 ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2528 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2529 len - baselen, &elems);
2530
2531 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2532 ifmgd->assoc_data->have_beacon = true;
2533 ifmgd->assoc_data->need_beacon = false;
2534 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
2535 sdata->vif.bss_conf.sync_tsf =
2536 le64_to_cpu(mgmt->u.beacon.timestamp);
2537 sdata->vif.bss_conf.sync_device_ts =
2538 rx_status->device_timestamp;
2539 if (elems.tim)
2540 sdata->vif.bss_conf.sync_dtim_count =
2541 elems.tim->dtim_count;
2542 else
2543 sdata->vif.bss_conf.sync_dtim_count = 0;
2544 }
2545 /* continue assoc process */
2546 ifmgd->assoc_data->timeout = jiffies;
2547 ifmgd->assoc_data->timeout_started = true;
2548 run_again(ifmgd, ifmgd->assoc_data->timeout);
2549 return;
2550 }
2551
2552 if (!ifmgd->associated ||
2553 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2554 return;
2555 bssid = ifmgd->associated->bssid;
2556
2557 /* Track average RSSI from the Beacon frames of the current AP */
2558 ifmgd->last_beacon_signal = rx_status->signal;
2559 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2560 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2561 ifmgd->ave_beacon_signal = rx_status->signal * 16;
2562 ifmgd->last_cqm_event_signal = 0;
2563 ifmgd->count_beacon_signal = 1;
2564 ifmgd->last_ave_beacon_signal = 0;
2565 } else {
2566 ifmgd->ave_beacon_signal =
2567 (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
2568 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
2569 ifmgd->ave_beacon_signal) / 16;
2570 ifmgd->count_beacon_signal++;
2571 }
2572
2573 if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
2574 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
2575 int sig = ifmgd->ave_beacon_signal;
2576 int last_sig = ifmgd->last_ave_beacon_signal;
2577
2578 /*
2579 * if signal crosses either of the boundaries, invoke callback
2580 * with appropriate parameters
2581 */
2582 if (sig > ifmgd->rssi_max_thold &&
2583 (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
2584 ifmgd->last_ave_beacon_signal = sig;
2585 drv_rssi_callback(local, sdata, RSSI_EVENT_HIGH);
2586 } else if (sig < ifmgd->rssi_min_thold &&
2587 (last_sig >= ifmgd->rssi_max_thold ||
2588 last_sig == 0)) {
2589 ifmgd->last_ave_beacon_signal = sig;
2590 drv_rssi_callback(local, sdata, RSSI_EVENT_LOW);
2591 }
2592 }
2593
2594 if (bss_conf->cqm_rssi_thold &&
2595 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
2596 !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
2597 int sig = ifmgd->ave_beacon_signal / 16;
2598 int last_event = ifmgd->last_cqm_event_signal;
2599 int thold = bss_conf->cqm_rssi_thold;
2600 int hyst = bss_conf->cqm_rssi_hyst;
2601 if (sig < thold &&
2602 (last_event == 0 || sig < last_event - hyst)) {
2603 ifmgd->last_cqm_event_signal = sig;
2604 ieee80211_cqm_rssi_notify(
2605 &sdata->vif,
2606 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
2607 GFP_KERNEL);
2608 } else if (sig > thold &&
2609 (last_event == 0 || sig > last_event + hyst)) {
2610 ifmgd->last_cqm_event_signal = sig;
2611 ieee80211_cqm_rssi_notify(
2612 &sdata->vif,
2613 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
2614 GFP_KERNEL);
2615 }
2616 }
2617
2618 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
2619 mlme_dbg_ratelimited(sdata,
2620 "cancelling AP probe due to a received beacon\n");
2621 mutex_lock(&local->mtx);
2622 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
2623 ieee80211_run_deferred_scan(local);
2624 mutex_unlock(&local->mtx);
2625
2626 mutex_lock(&local->iflist_mtx);
2627 ieee80211_recalc_ps(local, -1);
2628 mutex_unlock(&local->iflist_mtx);
2629 }
2630
2631 /*
2632 * Push the beacon loss detection into the future since
2633 * we are processing a beacon from the AP just now.
2634 */
2635 ieee80211_sta_reset_beacon_monitor(sdata);
2636
2637 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
2638 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
2639 len - baselen, &elems,
2640 care_about_ies, ncrc);
2641
2642 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
2643 bool directed_tim = ieee80211_check_tim(elems.tim,
2644 elems.tim_len,
2645 ifmgd->aid);
2646 if (directed_tim) {
2647 if (local->hw.conf.dynamic_ps_timeout > 0) {
2648 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2649 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2650 ieee80211_hw_config(local,
2651 IEEE80211_CONF_CHANGE_PS);
2652 }
2653 ieee80211_send_nullfunc(local, sdata, 0);
2654 } else if (!local->pspolling && sdata->u.mgd.powersave) {
2655 local->pspolling = true;
2656
2657 /*
2658 * Here is assumed that the driver will be
2659 * able to send ps-poll frame and receive a
2660 * response even though power save mode is
2661 * enabled, but some drivers might require
2662 * to disable power save here. This needs
2663 * to be investigated.
2664 */
2665 ieee80211_send_pspoll(local, sdata);
2666 }
2667 }
2668 }
2669
2670 if (sdata->vif.p2p) {
2671 u8 noa[2];
2672 int ret;
2673
2674 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
2675 len - baselen,
2676 IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
2677 noa, sizeof(noa));
2678 if (ret >= 2 && sdata->u.mgd.p2p_noa_index != noa[0]) {
2679 bss_conf->p2p_oppps = noa[1] & 0x80;
2680 bss_conf->p2p_ctwindow = noa[1] & 0x7f;
2681 changed |= BSS_CHANGED_P2P_PS;
2682 sdata->u.mgd.p2p_noa_index = noa[0];
2683 /*
2684 * make sure we update all information, the CRC
2685 * mechanism doesn't look at P2P attributes.
2686 */
2687 ifmgd->beacon_crc_valid = false;
2688 }
2689 }
2690
2691 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
2692 return;
2693 ifmgd->beacon_crc = ncrc;
2694 ifmgd->beacon_crc_valid = true;
2695
2696 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2697
2698 if (ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2699 elems.wmm_param_len))
2700 changed |= BSS_CHANGED_QOS;
2701
2702 /*
2703 * If we haven't had a beacon before, tell the driver about the
2704 * DTIM period (and beacon timing if desired) now.
2705 */
2706 if (!bss_conf->dtim_period) {
2707 /* a few bogus AP send dtim_period = 0 or no TIM IE */
2708 if (elems.tim)
2709 bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
2710 else
2711 bss_conf->dtim_period = 1;
2712
2713 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
2714 sdata->vif.bss_conf.sync_tsf =
2715 le64_to_cpu(mgmt->u.beacon.timestamp);
2716 sdata->vif.bss_conf.sync_device_ts =
2717 rx_status->device_timestamp;
2718 if (elems.tim)
2719 sdata->vif.bss_conf.sync_dtim_count =
2720 elems.tim->dtim_count;
2721 else
2722 sdata->vif.bss_conf.sync_dtim_count = 0;
2723 }
2724
2725 changed |= BSS_CHANGED_DTIM_PERIOD;
2726 }
2727
2728 if (elems.erp_info && elems.erp_info_len >= 1) {
2729 erp_valid = true;
2730 erp_value = elems.erp_info[0];
2731 } else {
2732 erp_valid = false;
2733 }
2734 changed |= ieee80211_handle_bss_capability(sdata,
2735 le16_to_cpu(mgmt->u.beacon.capab_info),
2736 erp_valid, erp_value);
2737
2738
2739 if (elems.ht_cap_elem && elems.ht_operation && elems.wmm_param &&
2740 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2741 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2742 bssid, true);
2743
2744 if (elems.country_elem && elems.pwr_constr_elem &&
2745 mgmt->u.probe_resp.capab_info &
2746 cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT))
2747 changed |= ieee80211_handle_pwr_constr(sdata, chan,
2748 elems.country_elem,
2749 elems.country_elem_len,
2750 elems.pwr_constr_elem);
2751
2752 ieee80211_bss_info_change_notify(sdata, changed);
2753 }
2754
2755 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2756 struct sk_buff *skb)
2757 {
2758 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2759 struct ieee80211_rx_status *rx_status;
2760 struct ieee80211_mgmt *mgmt;
2761 struct cfg80211_bss *bss = NULL;
2762 enum rx_mgmt_action rma = RX_MGMT_NONE;
2763 u16 fc;
2764
2765 rx_status = (struct ieee80211_rx_status *) skb->cb;
2766 mgmt = (struct ieee80211_mgmt *) skb->data;
2767 fc = le16_to_cpu(mgmt->frame_control);
2768
2769 mutex_lock(&ifmgd->mtx);
2770
2771 switch (fc & IEEE80211_FCTL_STYPE) {
2772 case IEEE80211_STYPE_BEACON:
2773 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2774 break;
2775 case IEEE80211_STYPE_PROBE_RESP:
2776 ieee80211_rx_mgmt_probe_resp(sdata, skb);
2777 break;
2778 case IEEE80211_STYPE_AUTH:
2779 rma = ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
2780 break;
2781 case IEEE80211_STYPE_DEAUTH:
2782 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
2783 break;
2784 case IEEE80211_STYPE_DISASSOC:
2785 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
2786 break;
2787 case IEEE80211_STYPE_ASSOC_RESP:
2788 case IEEE80211_STYPE_REASSOC_RESP:
2789 rma = ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, &bss);
2790 break;
2791 case IEEE80211_STYPE_ACTION:
2792 switch (mgmt->u.action.category) {
2793 case WLAN_CATEGORY_SPECTRUM_MGMT:
2794 ieee80211_sta_process_chanswitch(sdata,
2795 &mgmt->u.action.u.chan_switch.sw_elem,
2796 (void *)ifmgd->associated->priv,
2797 rx_status->mactime);
2798 break;
2799 }
2800 }
2801 mutex_unlock(&ifmgd->mtx);
2802
2803 switch (rma) {
2804 case RX_MGMT_NONE:
2805 /* no action */
2806 break;
2807 case RX_MGMT_CFG80211_DEAUTH:
2808 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2809 break;
2810 case RX_MGMT_CFG80211_DISASSOC:
2811 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
2812 break;
2813 case RX_MGMT_CFG80211_RX_AUTH:
2814 cfg80211_send_rx_auth(sdata->dev, (u8 *)mgmt, skb->len);
2815 break;
2816 case RX_MGMT_CFG80211_RX_ASSOC:
2817 cfg80211_send_rx_assoc(sdata->dev, bss, (u8 *)mgmt, skb->len);
2818 break;
2819 case RX_MGMT_CFG80211_ASSOC_TIMEOUT:
2820 cfg80211_send_assoc_timeout(sdata->dev, mgmt->bssid);
2821 break;
2822 default:
2823 WARN(1, "unexpected: %d", rma);
2824 }
2825 }
2826
2827 static void ieee80211_sta_timer(unsigned long data)
2828 {
2829 struct ieee80211_sub_if_data *sdata =
2830 (struct ieee80211_sub_if_data *) data;
2831 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2832 struct ieee80211_local *local = sdata->local;
2833
2834 if (local->quiescing) {
2835 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2836 return;
2837 }
2838
2839 ieee80211_queue_work(&local->hw, &sdata->work);
2840 }
2841
2842 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2843 u8 *bssid, u8 reason, bool tx)
2844 {
2845 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2846 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2847
2848 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
2849 tx, frame_buf);
2850 mutex_unlock(&ifmgd->mtx);
2851
2852 /*
2853 * must be outside lock due to cfg80211,
2854 * but that's not a problem.
2855 */
2856 cfg80211_send_deauth(sdata->dev, frame_buf, IEEE80211_DEAUTH_FRAME_LEN);
2857
2858 mutex_lock(&ifmgd->mtx);
2859 }
2860
2861 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
2862 {
2863 struct ieee80211_local *local = sdata->local;
2864 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2865 struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
2866 u32 tx_flags = 0;
2867
2868 lockdep_assert_held(&ifmgd->mtx);
2869
2870 if (WARN_ON_ONCE(!auth_data))
2871 return -EINVAL;
2872
2873 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2874 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2875 IEEE80211_TX_INTFL_MLME_CONN_TX;
2876
2877 auth_data->tries++;
2878
2879 if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
2880 sdata_info(sdata, "authentication with %pM timed out\n",
2881 auth_data->bss->bssid);
2882
2883 /*
2884 * Most likely AP is not in the range so remove the
2885 * bss struct for that AP.
2886 */
2887 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
2888
2889 return -ETIMEDOUT;
2890 }
2891
2892 drv_mgd_prepare_tx(local, sdata);
2893
2894 if (auth_data->bss->proberesp_ies) {
2895 u16 trans = 1;
2896 u16 status = 0;
2897
2898 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
2899 auth_data->bss->bssid, auth_data->tries,
2900 IEEE80211_AUTH_MAX_TRIES);
2901
2902 auth_data->expected_transaction = 2;
2903
2904 if (auth_data->algorithm == WLAN_AUTH_SAE) {
2905 trans = auth_data->sae_trans;
2906 status = auth_data->sae_status;
2907 auth_data->expected_transaction = trans;
2908 }
2909
2910 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
2911 auth_data->data, auth_data->data_len,
2912 auth_data->bss->bssid,
2913 auth_data->bss->bssid, NULL, 0, 0,
2914 tx_flags);
2915 } else {
2916 const u8 *ssidie;
2917
2918 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
2919 auth_data->bss->bssid, auth_data->tries,
2920 IEEE80211_AUTH_MAX_TRIES);
2921
2922 rcu_read_lock();
2923 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
2924 if (!ssidie) {
2925 rcu_read_unlock();
2926 return -EINVAL;
2927 }
2928 /*
2929 * Direct probe is sent to broadcast address as some APs
2930 * will not answer to direct packet in unassociated state.
2931 */
2932 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
2933 NULL, 0, (u32) -1, true, tx_flags,
2934 auth_data->bss->channel, false);
2935 rcu_read_unlock();
2936 }
2937
2938 if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
2939 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
2940 ifmgd->auth_data->timeout_started = true;
2941 run_again(ifmgd, auth_data->timeout);
2942 } else {
2943 auth_data->timeout_started = false;
2944 }
2945
2946 return 0;
2947 }
2948
2949 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
2950 {
2951 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2952 struct ieee80211_local *local = sdata->local;
2953
2954 lockdep_assert_held(&sdata->u.mgd.mtx);
2955
2956 assoc_data->tries++;
2957 if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
2958 sdata_info(sdata, "association with %pM timed out\n",
2959 assoc_data->bss->bssid);
2960
2961 /*
2962 * Most likely AP is not in the range so remove the
2963 * bss struct for that AP.
2964 */
2965 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
2966
2967 return -ETIMEDOUT;
2968 }
2969
2970 sdata_info(sdata, "associate with %pM (try %d/%d)\n",
2971 assoc_data->bss->bssid, assoc_data->tries,
2972 IEEE80211_ASSOC_MAX_TRIES);
2973 ieee80211_send_assoc(sdata);
2974
2975 if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
2976 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
2977 assoc_data->timeout_started = true;
2978 run_again(&sdata->u.mgd, assoc_data->timeout);
2979 } else {
2980 assoc_data->timeout_started = false;
2981 }
2982
2983 return 0;
2984 }
2985
2986 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
2987 __le16 fc, bool acked)
2988 {
2989 struct ieee80211_local *local = sdata->local;
2990
2991 sdata->u.mgd.status_fc = fc;
2992 sdata->u.mgd.status_acked = acked;
2993 sdata->u.mgd.status_received = true;
2994
2995 ieee80211_queue_work(&local->hw, &sdata->work);
2996 }
2997
2998 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2999 {
3000 struct ieee80211_local *local = sdata->local;
3001 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3002
3003 mutex_lock(&ifmgd->mtx);
3004
3005 if (ifmgd->status_received) {
3006 __le16 fc = ifmgd->status_fc;
3007 bool status_acked = ifmgd->status_acked;
3008
3009 ifmgd->status_received = false;
3010 if (ifmgd->auth_data &&
3011 (ieee80211_is_probe_req(fc) || ieee80211_is_auth(fc))) {
3012 if (status_acked) {
3013 ifmgd->auth_data->timeout =
3014 jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3015 run_again(ifmgd, ifmgd->auth_data->timeout);
3016 } else {
3017 ifmgd->auth_data->timeout = jiffies - 1;
3018 }
3019 ifmgd->auth_data->timeout_started = true;
3020 } else if (ifmgd->assoc_data &&
3021 (ieee80211_is_assoc_req(fc) ||
3022 ieee80211_is_reassoc_req(fc))) {
3023 if (status_acked) {
3024 ifmgd->assoc_data->timeout =
3025 jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3026 run_again(ifmgd, ifmgd->assoc_data->timeout);
3027 } else {
3028 ifmgd->assoc_data->timeout = jiffies - 1;
3029 }
3030 ifmgd->assoc_data->timeout_started = true;
3031 }
3032 }
3033
3034 if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3035 time_after(jiffies, ifmgd->auth_data->timeout)) {
3036 if (ifmgd->auth_data->done) {
3037 /*
3038 * ok ... we waited for assoc but userspace didn't,
3039 * so let's just kill the auth data
3040 */
3041 ieee80211_destroy_auth_data(sdata, false);
3042 } else if (ieee80211_probe_auth(sdata)) {
3043 u8 bssid[ETH_ALEN];
3044
3045 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3046
3047 ieee80211_destroy_auth_data(sdata, false);
3048
3049 mutex_unlock(&ifmgd->mtx);
3050 cfg80211_send_auth_timeout(sdata->dev, bssid);
3051 mutex_lock(&ifmgd->mtx);
3052 }
3053 } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3054 run_again(ifmgd, ifmgd->auth_data->timeout);
3055
3056 if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3057 time_after(jiffies, ifmgd->assoc_data->timeout)) {
3058 if ((ifmgd->assoc_data->need_beacon &&
3059 !ifmgd->assoc_data->have_beacon) ||
3060 ieee80211_do_assoc(sdata)) {
3061 u8 bssid[ETH_ALEN];
3062
3063 memcpy(bssid, ifmgd->assoc_data->bss->bssid, ETH_ALEN);
3064
3065 ieee80211_destroy_assoc_data(sdata, false);
3066
3067 mutex_unlock(&ifmgd->mtx);
3068 cfg80211_send_assoc_timeout(sdata->dev, bssid);
3069 mutex_lock(&ifmgd->mtx);
3070 }
3071 } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3072 run_again(ifmgd, ifmgd->assoc_data->timeout);
3073
3074 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
3075 IEEE80211_STA_CONNECTION_POLL) &&
3076 ifmgd->associated) {
3077 u8 bssid[ETH_ALEN];
3078 int max_tries;
3079
3080 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3081
3082 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3083 max_tries = max_nullfunc_tries;
3084 else
3085 max_tries = max_probe_tries;
3086
3087 /* ACK received for nullfunc probing frame */
3088 if (!ifmgd->probe_send_count)
3089 ieee80211_reset_ap_probe(sdata);
3090 else if (ifmgd->nullfunc_failed) {
3091 if (ifmgd->probe_send_count < max_tries) {
3092 mlme_dbg(sdata,
3093 "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3094 bssid, ifmgd->probe_send_count,
3095 max_tries);
3096 ieee80211_mgd_probe_ap_send(sdata);
3097 } else {
3098 mlme_dbg(sdata,
3099 "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3100 bssid);
3101 ieee80211_sta_connection_lost(sdata, bssid,
3102 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3103 false);
3104 }
3105 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3106 run_again(ifmgd, ifmgd->probe_timeout);
3107 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
3108 mlme_dbg(sdata,
3109 "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3110 bssid, probe_wait_ms);
3111 ieee80211_sta_connection_lost(sdata, bssid,
3112 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3113 } else if (ifmgd->probe_send_count < max_tries) {
3114 mlme_dbg(sdata,
3115 "No probe response from AP %pM after %dms, try %d/%i\n",
3116 bssid, probe_wait_ms,
3117 ifmgd->probe_send_count, max_tries);
3118 ieee80211_mgd_probe_ap_send(sdata);
3119 } else {
3120 /*
3121 * We actually lost the connection ... or did we?
3122 * Let's make sure!
3123 */
3124 wiphy_debug(local->hw.wiphy,
3125 "%s: No probe response from AP %pM"
3126 " after %dms, disconnecting.\n",
3127 sdata->name,
3128 bssid, probe_wait_ms);
3129
3130 ieee80211_sta_connection_lost(sdata, bssid,
3131 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3132 }
3133 }
3134
3135 mutex_unlock(&ifmgd->mtx);
3136 }
3137
3138 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3139 {
3140 struct ieee80211_sub_if_data *sdata =
3141 (struct ieee80211_sub_if_data *) data;
3142 struct ieee80211_local *local = sdata->local;
3143
3144 if (local->quiescing)
3145 return;
3146
3147 sdata->u.mgd.connection_loss = false;
3148 ieee80211_queue_work(&sdata->local->hw,
3149 &sdata->u.mgd.beacon_connection_loss_work);
3150 }
3151
3152 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3153 {
3154 struct ieee80211_sub_if_data *sdata =
3155 (struct ieee80211_sub_if_data *) data;
3156 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3157 struct ieee80211_local *local = sdata->local;
3158
3159 if (local->quiescing)
3160 return;
3161
3162 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3163 }
3164
3165 static void ieee80211_sta_monitor_work(struct work_struct *work)
3166 {
3167 struct ieee80211_sub_if_data *sdata =
3168 container_of(work, struct ieee80211_sub_if_data,
3169 u.mgd.monitor_work);
3170
3171 ieee80211_mgd_probe_ap(sdata, false);
3172 }
3173
3174 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3175 {
3176 u32 flags;
3177
3178 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3179 __ieee80211_stop_poll(sdata);
3180
3181 /* let's probe the connection once */
3182 flags = sdata->local->hw.flags;
3183 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
3184 ieee80211_queue_work(&sdata->local->hw,
3185 &sdata->u.mgd.monitor_work);
3186 /* and do all the other regular work too */
3187 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3188 }
3189 }
3190
3191 #ifdef CONFIG_PM
3192 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
3193 {
3194 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3195
3196 /*
3197 * we need to use atomic bitops for the running bits
3198 * only because both timers might fire at the same
3199 * time -- the code here is properly synchronised.
3200 */
3201
3202 cancel_work_sync(&ifmgd->request_smps_work);
3203
3204 cancel_work_sync(&ifmgd->monitor_work);
3205 cancel_work_sync(&ifmgd->beacon_connection_loss_work);
3206 cancel_work_sync(&ifmgd->csa_connection_drop_work);
3207 if (del_timer_sync(&ifmgd->timer))
3208 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
3209
3210 cancel_work_sync(&ifmgd->chswitch_work);
3211 if (del_timer_sync(&ifmgd->chswitch_timer))
3212 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
3213
3214 /* these will just be re-established on connection */
3215 del_timer_sync(&ifmgd->conn_mon_timer);
3216 del_timer_sync(&ifmgd->bcn_mon_timer);
3217 }
3218
3219 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
3220 {
3221 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3222
3223 mutex_lock(&ifmgd->mtx);
3224 if (!ifmgd->associated) {
3225 mutex_unlock(&ifmgd->mtx);
3226 return;
3227 }
3228
3229 if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
3230 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
3231 mlme_dbg(sdata, "driver requested disconnect after resume\n");
3232 ieee80211_sta_connection_lost(sdata,
3233 ifmgd->associated->bssid,
3234 WLAN_REASON_UNSPECIFIED,
3235 true);
3236 mutex_unlock(&ifmgd->mtx);
3237 return;
3238 }
3239 mutex_unlock(&ifmgd->mtx);
3240
3241 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
3242 add_timer(&ifmgd->timer);
3243 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
3244 add_timer(&ifmgd->chswitch_timer);
3245 ieee80211_sta_reset_beacon_monitor(sdata);
3246
3247 mutex_lock(&sdata->local->mtx);
3248 ieee80211_restart_sta_timer(sdata);
3249 mutex_unlock(&sdata->local->mtx);
3250 }
3251 #endif
3252
3253 /* interface setup */
3254 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3255 {
3256 struct ieee80211_if_managed *ifmgd;
3257
3258 ifmgd = &sdata->u.mgd;
3259 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3260 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3261 INIT_WORK(&ifmgd->beacon_connection_loss_work,
3262 ieee80211_beacon_connection_loss_work);
3263 INIT_WORK(&ifmgd->csa_connection_drop_work,
3264 ieee80211_csa_connection_drop_work);
3265 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
3266 setup_timer(&ifmgd->timer, ieee80211_sta_timer,
3267 (unsigned long) sdata);
3268 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
3269 (unsigned long) sdata);
3270 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
3271 (unsigned long) sdata);
3272 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
3273 (unsigned long) sdata);
3274
3275 ifmgd->flags = 0;
3276 ifmgd->powersave = sdata->wdev.ps;
3277 ifmgd->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
3278 ifmgd->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
3279
3280 mutex_init(&ifmgd->mtx);
3281
3282 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
3283 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
3284 else
3285 ifmgd->req_smps = IEEE80211_SMPS_OFF;
3286 }
3287
3288 /* scan finished notification */
3289 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
3290 {
3291 struct ieee80211_sub_if_data *sdata;
3292
3293 /* Restart STA timers */
3294 rcu_read_lock();
3295 list_for_each_entry_rcu(sdata, &local->interfaces, list)
3296 ieee80211_restart_sta_timer(sdata);
3297 rcu_read_unlock();
3298 }
3299
3300 int ieee80211_max_network_latency(struct notifier_block *nb,
3301 unsigned long data, void *dummy)
3302 {
3303 s32 latency_usec = (s32) data;
3304 struct ieee80211_local *local =
3305 container_of(nb, struct ieee80211_local,
3306 network_latency_notifier);
3307
3308 mutex_lock(&local->iflist_mtx);
3309 ieee80211_recalc_ps(local, latency_usec);
3310 mutex_unlock(&local->iflist_mtx);
3311
3312 return 0;
3313 }
3314
3315 static u32 chandef_downgrade(struct cfg80211_chan_def *c)
3316 {
3317 u32 ret;
3318 int tmp;
3319
3320 switch (c->width) {
3321 case NL80211_CHAN_WIDTH_20:
3322 c->width = NL80211_CHAN_WIDTH_20_NOHT;
3323 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
3324 break;
3325 case NL80211_CHAN_WIDTH_40:
3326 c->width = NL80211_CHAN_WIDTH_20;
3327 c->center_freq1 = c->chan->center_freq;
3328 ret = IEEE80211_STA_DISABLE_40MHZ |
3329 IEEE80211_STA_DISABLE_VHT;
3330 break;
3331 case NL80211_CHAN_WIDTH_80:
3332 tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
3333 /* n_P40 */
3334 tmp /= 2;
3335 /* freq_P40 */
3336 c->center_freq1 = c->center_freq1 - 20 + 40 * tmp;
3337 c->width = NL80211_CHAN_WIDTH_40;
3338 ret = IEEE80211_STA_DISABLE_VHT;
3339 break;
3340 case NL80211_CHAN_WIDTH_80P80:
3341 c->center_freq2 = 0;
3342 c->width = NL80211_CHAN_WIDTH_80;
3343 ret = IEEE80211_STA_DISABLE_80P80MHZ |
3344 IEEE80211_STA_DISABLE_160MHZ;
3345 break;
3346 case NL80211_CHAN_WIDTH_160:
3347 /* n_P20 */
3348 tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
3349 /* n_P80 */
3350 tmp /= 4;
3351 c->center_freq1 = c->center_freq1 - 40 + 80 * tmp;
3352 c->width = NL80211_CHAN_WIDTH_80;
3353 ret = IEEE80211_STA_DISABLE_80P80MHZ |
3354 IEEE80211_STA_DISABLE_160MHZ;
3355 break;
3356 default:
3357 case NL80211_CHAN_WIDTH_20_NOHT:
3358 WARN_ON_ONCE(1);
3359 c->width = NL80211_CHAN_WIDTH_20_NOHT;
3360 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
3361 break;
3362 }
3363
3364 WARN_ON_ONCE(!cfg80211_chandef_valid(c));
3365
3366 return ret;
3367 }
3368
3369 static u32
3370 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
3371 struct ieee80211_supported_band *sband,
3372 struct ieee80211_channel *channel,
3373 const struct ieee80211_ht_operation *ht_oper,
3374 const struct ieee80211_vht_operation *vht_oper,
3375 struct cfg80211_chan_def *chandef)
3376 {
3377 struct cfg80211_chan_def vht_chandef;
3378 u32 ht_cfreq, ret;
3379
3380 chandef->chan = channel;
3381 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
3382 chandef->center_freq1 = channel->center_freq;
3383 chandef->center_freq2 = 0;
3384
3385 if (!ht_oper || !sband->ht_cap.ht_supported) {
3386 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
3387 goto out;
3388 }
3389
3390 chandef->width = NL80211_CHAN_WIDTH_20;
3391
3392 ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
3393 channel->band);
3394 /* check that channel matches the right operating channel */
3395 if (channel->center_freq != ht_cfreq) {
3396 /*
3397 * It's possible that some APs are confused here;
3398 * Netgear WNDR3700 sometimes reports 4 higher than
3399 * the actual channel in association responses, but
3400 * since we look at probe response/beacon data here
3401 * it should be OK.
3402 */
3403 sdata_info(sdata,
3404 "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
3405 channel->center_freq, ht_cfreq,
3406 ht_oper->primary_chan, channel->band);
3407 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
3408 goto out;
3409 }
3410
3411 /* check 40 MHz support, if we have it */
3412 if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
3413 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
3414 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
3415 chandef->width = NL80211_CHAN_WIDTH_40;
3416 chandef->center_freq1 += 10;
3417 break;
3418 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
3419 chandef->width = NL80211_CHAN_WIDTH_40;
3420 chandef->center_freq1 -= 10;
3421 break;
3422 }
3423 } else {
3424 /* 40 MHz (and 80 MHz) must be supported for VHT */
3425 ret = IEEE80211_STA_DISABLE_VHT;
3426 goto out;
3427 }
3428
3429 if (!vht_oper || !sband->vht_cap.vht_supported) {
3430 ret = IEEE80211_STA_DISABLE_VHT;
3431 goto out;
3432 }
3433
3434 vht_chandef.chan = channel;
3435 vht_chandef.center_freq1 =
3436 ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx,
3437 channel->band);
3438 vht_chandef.center_freq2 = 0;
3439
3440 if (vht_oper->center_freq_seg2_idx)
3441 vht_chandef.center_freq2 =
3442 ieee80211_channel_to_frequency(
3443 vht_oper->center_freq_seg2_idx,
3444 channel->band);
3445
3446 switch (vht_oper->chan_width) {
3447 case IEEE80211_VHT_CHANWIDTH_USE_HT:
3448 vht_chandef.width = chandef->width;
3449 break;
3450 case IEEE80211_VHT_CHANWIDTH_80MHZ:
3451 vht_chandef.width = NL80211_CHAN_WIDTH_80;
3452 break;
3453 case IEEE80211_VHT_CHANWIDTH_160MHZ:
3454 vht_chandef.width = NL80211_CHAN_WIDTH_160;
3455 break;
3456 case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
3457 vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
3458 break;
3459 default:
3460 sdata_info(sdata,
3461 "AP VHT operation IE has invalid channel width (%d), disable VHT\n",
3462 vht_oper->chan_width);
3463 ret = IEEE80211_STA_DISABLE_VHT;
3464 goto out;
3465 }
3466
3467 if (!cfg80211_chandef_valid(&vht_chandef)) {
3468 sdata_info(sdata,
3469 "AP VHT information is invalid, disable VHT\n");
3470 ret = IEEE80211_STA_DISABLE_VHT;
3471 goto out;
3472 }
3473
3474 if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
3475 ret = 0;
3476 goto out;
3477 }
3478
3479 if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
3480 sdata_info(sdata,
3481 "AP VHT information doesn't match HT, disable VHT\n");
3482 ret = IEEE80211_STA_DISABLE_VHT;
3483 goto out;
3484 }
3485
3486 *chandef = vht_chandef;
3487
3488 ret = 0;
3489
3490 out:
3491 while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
3492 IEEE80211_CHAN_DISABLED)) {
3493 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
3494 ret = IEEE80211_STA_DISABLE_HT |
3495 IEEE80211_STA_DISABLE_VHT;
3496 goto out;
3497 }
3498
3499 ret |= chandef_downgrade(chandef);
3500 }
3501
3502 if (chandef->width != vht_chandef.width)
3503 sdata_info(sdata,
3504 "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
3505
3506 WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
3507 return ret;
3508 }
3509
3510 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
3511 struct cfg80211_bss *cbss)
3512 {
3513 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3514 const u8 *ht_cap_ie, *vht_cap_ie;
3515 const struct ieee80211_ht_cap *ht_cap;
3516 const struct ieee80211_vht_cap *vht_cap;
3517 u8 chains = 1;
3518
3519 if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
3520 return chains;
3521
3522 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
3523 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
3524 ht_cap = (void *)(ht_cap_ie + 2);
3525 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
3526 /*
3527 * TODO: use "Tx Maximum Number Spatial Streams Supported" and
3528 * "Tx Unequal Modulation Supported" fields.
3529 */
3530 }
3531
3532 if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
3533 return chains;
3534
3535 vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
3536 if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
3537 u8 nss;
3538 u16 tx_mcs_map;
3539
3540 vht_cap = (void *)(vht_cap_ie + 2);
3541 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
3542 for (nss = 8; nss > 0; nss--) {
3543 if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
3544 IEEE80211_VHT_MCS_NOT_SUPPORTED)
3545 break;
3546 }
3547 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
3548 chains = max(chains, nss);
3549 }
3550
3551 return chains;
3552 }
3553
3554 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
3555 struct cfg80211_bss *cbss)
3556 {
3557 struct ieee80211_local *local = sdata->local;
3558 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3559 const struct ieee80211_ht_operation *ht_oper = NULL;
3560 const struct ieee80211_vht_operation *vht_oper = NULL;
3561 struct ieee80211_supported_band *sband;
3562 struct cfg80211_chan_def chandef;
3563 int ret;
3564
3565 sband = local->hw.wiphy->bands[cbss->channel->band];
3566
3567 ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
3568 IEEE80211_STA_DISABLE_80P80MHZ |
3569 IEEE80211_STA_DISABLE_160MHZ);
3570
3571 rcu_read_lock();
3572
3573 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
3574 sband->ht_cap.ht_supported) {
3575 const u8 *ht_oper_ie;
3576
3577 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
3578 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3579 ht_oper = (void *)(ht_oper_ie + 2);
3580 }
3581
3582 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
3583 sband->vht_cap.vht_supported) {
3584 const u8 *vht_oper_ie;
3585
3586 vht_oper_ie = ieee80211_bss_get_ie(cbss,
3587 WLAN_EID_VHT_OPERATION);
3588 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
3589 vht_oper = (void *)(vht_oper_ie + 2);
3590 if (vht_oper && !ht_oper) {
3591 vht_oper = NULL;
3592 sdata_info(sdata,
3593 "AP advertised VHT without HT, disabling both\n");
3594 sdata->flags |= IEEE80211_STA_DISABLE_HT;
3595 sdata->flags |= IEEE80211_STA_DISABLE_VHT;
3596 }
3597 }
3598
3599 ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
3600 cbss->channel,
3601 ht_oper, vht_oper,
3602 &chandef);
3603
3604 sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
3605 local->rx_chains);
3606
3607 rcu_read_unlock();
3608
3609 /* will change later if needed */
3610 sdata->smps_mode = IEEE80211_SMPS_OFF;
3611
3612 /*
3613 * If this fails (possibly due to channel context sharing
3614 * on incompatible channels, e.g. 80+80 and 160 sharing the
3615 * same control channel) try to use a smaller bandwidth.
3616 */
3617 ret = ieee80211_vif_use_channel(sdata, &chandef,
3618 IEEE80211_CHANCTX_SHARED);
3619 while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
3620 ifmgd->flags |= chandef_downgrade(&chandef);
3621 ret = ieee80211_vif_use_channel(sdata, &chandef,
3622 IEEE80211_CHANCTX_SHARED);
3623 }
3624 return ret;
3625 }
3626
3627 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3628 struct cfg80211_bss *cbss, bool assoc)
3629 {
3630 struct ieee80211_local *local = sdata->local;
3631 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3632 struct ieee80211_bss *bss = (void *)cbss->priv;
3633 struct sta_info *new_sta = NULL;
3634 bool have_sta = false;
3635 int err;
3636
3637 if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3638 return -EINVAL;
3639
3640 if (assoc) {
3641 rcu_read_lock();
3642 have_sta = sta_info_get(sdata, cbss->bssid);
3643 rcu_read_unlock();
3644 }
3645
3646 if (!have_sta) {
3647 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3648 if (!new_sta)
3649 return -ENOMEM;
3650 }
3651
3652 if (new_sta) {
3653 u32 rates = 0, basic_rates = 0;
3654 bool have_higher_than_11mbit;
3655 int min_rate = INT_MAX, min_rate_index = -1;
3656 struct ieee80211_supported_band *sband;
3657 const struct cfg80211_bss_ies *ies;
3658
3659 sband = local->hw.wiphy->bands[cbss->channel->band];
3660
3661 err = ieee80211_prep_channel(sdata, cbss);
3662 if (err) {
3663 sta_info_free(local, new_sta);
3664 return err;
3665 }
3666
3667 ieee80211_get_rates(sband, bss->supp_rates,
3668 bss->supp_rates_len,
3669 &rates, &basic_rates,
3670 &have_higher_than_11mbit,
3671 &min_rate, &min_rate_index);
3672
3673 /*
3674 * This used to be a workaround for basic rates missing
3675 * in the association response frame. Now that we no
3676 * longer use the basic rates from there, it probably
3677 * doesn't happen any more, but keep the workaround so
3678 * in case some *other* APs are buggy in different ways
3679 * we can connect -- with a warning.
3680 */
3681 if (!basic_rates && min_rate_index >= 0) {
3682 sdata_info(sdata,
3683 "No basic rates, using min rate instead\n");
3684 basic_rates = BIT(min_rate_index);
3685 }
3686
3687 new_sta->sta.supp_rates[cbss->channel->band] = rates;
3688 sdata->vif.bss_conf.basic_rates = basic_rates;
3689
3690 /* cf. IEEE 802.11 9.2.12 */
3691 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
3692 have_higher_than_11mbit)
3693 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
3694 else
3695 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
3696
3697 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
3698
3699 /* set timing information */
3700 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
3701 rcu_read_lock();
3702 ies = rcu_dereference(cbss->beacon_ies);
3703 if (ies) {
3704 const u8 *tim_ie;
3705
3706 sdata->vif.bss_conf.sync_tsf = ies->tsf;
3707 sdata->vif.bss_conf.sync_device_ts =
3708 bss->device_ts_beacon;
3709 tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
3710 ies->data, ies->len);
3711 if (tim_ie && tim_ie[1] >= 2)
3712 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
3713 else
3714 sdata->vif.bss_conf.sync_dtim_count = 0;
3715 } else if (!(local->hw.flags &
3716 IEEE80211_HW_TIMING_BEACON_ONLY)) {
3717 ies = rcu_dereference(cbss->proberesp_ies);
3718 /* must be non-NULL since beacon IEs were NULL */
3719 sdata->vif.bss_conf.sync_tsf = ies->tsf;
3720 sdata->vif.bss_conf.sync_device_ts =
3721 bss->device_ts_presp;
3722 sdata->vif.bss_conf.sync_dtim_count = 0;
3723 } else {
3724 sdata->vif.bss_conf.sync_tsf = 0;
3725 sdata->vif.bss_conf.sync_device_ts = 0;
3726 sdata->vif.bss_conf.sync_dtim_count = 0;
3727 }
3728 rcu_read_unlock();
3729
3730 /* tell driver about BSSID, basic rates and timing */
3731 ieee80211_bss_info_change_notify(sdata,
3732 BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
3733 BSS_CHANGED_BEACON_INT);
3734
3735 if (assoc)
3736 sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
3737
3738 err = sta_info_insert(new_sta);
3739 new_sta = NULL;
3740 if (err) {
3741 sdata_info(sdata,
3742 "failed to insert STA entry for the AP (error %d)\n",
3743 err);
3744 return err;
3745 }
3746 } else
3747 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
3748
3749 return 0;
3750 }
3751
3752 /* config hooks */
3753 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
3754 struct cfg80211_auth_request *req)
3755 {
3756 struct ieee80211_local *local = sdata->local;
3757 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3758 struct ieee80211_mgd_auth_data *auth_data;
3759 u16 auth_alg;
3760 int err;
3761
3762 /* prepare auth data structure */
3763
3764 switch (req->auth_type) {
3765 case NL80211_AUTHTYPE_OPEN_SYSTEM:
3766 auth_alg = WLAN_AUTH_OPEN;
3767 break;
3768 case NL80211_AUTHTYPE_SHARED_KEY:
3769 if (IS_ERR(local->wep_tx_tfm))
3770 return -EOPNOTSUPP;
3771 auth_alg = WLAN_AUTH_SHARED_KEY;
3772 break;
3773 case NL80211_AUTHTYPE_FT:
3774 auth_alg = WLAN_AUTH_FT;
3775 break;
3776 case NL80211_AUTHTYPE_NETWORK_EAP:
3777 auth_alg = WLAN_AUTH_LEAP;
3778 break;
3779 case NL80211_AUTHTYPE_SAE:
3780 auth_alg = WLAN_AUTH_SAE;
3781 break;
3782 default:
3783 return -EOPNOTSUPP;
3784 }
3785
3786 auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
3787 req->ie_len, GFP_KERNEL);
3788 if (!auth_data)
3789 return -ENOMEM;
3790
3791 auth_data->bss = req->bss;
3792
3793 if (req->sae_data_len >= 4) {
3794 __le16 *pos = (__le16 *) req->sae_data;
3795 auth_data->sae_trans = le16_to_cpu(pos[0]);
3796 auth_data->sae_status = le16_to_cpu(pos[1]);
3797 memcpy(auth_data->data, req->sae_data + 4,
3798 req->sae_data_len - 4);
3799 auth_data->data_len += req->sae_data_len - 4;
3800 }
3801
3802 if (req->ie && req->ie_len) {
3803 memcpy(&auth_data->data[auth_data->data_len],
3804 req->ie, req->ie_len);
3805 auth_data->data_len += req->ie_len;
3806 }
3807
3808 if (req->key && req->key_len) {
3809 auth_data->key_len = req->key_len;
3810 auth_data->key_idx = req->key_idx;
3811 memcpy(auth_data->key, req->key, req->key_len);
3812 }
3813
3814 auth_data->algorithm = auth_alg;
3815
3816 /* try to authenticate/probe */
3817
3818 mutex_lock(&ifmgd->mtx);
3819
3820 if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
3821 ifmgd->assoc_data) {
3822 err = -EBUSY;
3823 goto err_free;
3824 }
3825
3826 if (ifmgd->auth_data)
3827 ieee80211_destroy_auth_data(sdata, false);
3828
3829 /* prep auth_data so we don't go into idle on disassoc */
3830 ifmgd->auth_data = auth_data;
3831
3832 if (ifmgd->associated)
3833 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3834
3835 sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
3836
3837 err = ieee80211_prep_connection(sdata, req->bss, false);
3838 if (err)
3839 goto err_clear;
3840
3841 err = ieee80211_probe_auth(sdata);
3842 if (err) {
3843 sta_info_destroy_addr(sdata, req->bss->bssid);
3844 goto err_clear;
3845 }
3846
3847 /* hold our own reference */
3848 cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
3849 err = 0;
3850 goto out_unlock;
3851
3852 err_clear:
3853 memset(ifmgd->bssid, 0, ETH_ALEN);
3854 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
3855 ifmgd->auth_data = NULL;
3856 err_free:
3857 kfree(auth_data);
3858 out_unlock:
3859 mutex_unlock(&ifmgd->mtx);
3860
3861 return err;
3862 }
3863
3864 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
3865 struct cfg80211_assoc_request *req)
3866 {
3867 struct ieee80211_local *local = sdata->local;
3868 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3869 struct ieee80211_bss *bss = (void *)req->bss->priv;
3870 struct ieee80211_mgd_assoc_data *assoc_data;
3871 const struct cfg80211_bss_ies *beacon_ies;
3872 struct ieee80211_supported_band *sband;
3873 const u8 *ssidie, *ht_ie, *vht_ie;
3874 int i, err;
3875
3876 assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
3877 if (!assoc_data)
3878 return -ENOMEM;
3879
3880 rcu_read_lock();
3881 ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
3882 if (!ssidie) {
3883 rcu_read_unlock();
3884 kfree(assoc_data);
3885 return -EINVAL;
3886 }
3887 memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
3888 assoc_data->ssid_len = ssidie[1];
3889 rcu_read_unlock();
3890
3891 mutex_lock(&ifmgd->mtx);
3892
3893 if (ifmgd->associated)
3894 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3895
3896 if (ifmgd->auth_data && !ifmgd->auth_data->done) {
3897 err = -EBUSY;
3898 goto err_free;
3899 }
3900
3901 if (ifmgd->assoc_data) {
3902 err = -EBUSY;
3903 goto err_free;
3904 }
3905
3906 if (ifmgd->auth_data) {
3907 bool match;
3908
3909 /* keep sta info, bssid if matching */
3910 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
3911 ieee80211_destroy_auth_data(sdata, match);
3912 }
3913
3914 /* prepare assoc data */
3915
3916 ifmgd->beacon_crc_valid = false;
3917
3918 /*
3919 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
3920 * We still associate in non-HT mode (11a/b/g) if any one of these
3921 * ciphers is configured as pairwise.
3922 * We can set this to true for non-11n hardware, that'll be checked
3923 * separately along with the peer capabilities.
3924 */
3925 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
3926 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
3927 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
3928 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
3929 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3930 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3931 netdev_info(sdata->dev,
3932 "disabling HT/VHT due to WEP/TKIP use\n");
3933 }
3934 }
3935
3936 if (req->flags & ASSOC_REQ_DISABLE_HT) {
3937 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3938 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3939 }
3940
3941 /* Also disable HT if we don't support it or the AP doesn't use WMM */
3942 sband = local->hw.wiphy->bands[req->bss->channel->band];
3943 if (!sband->ht_cap.ht_supported ||
3944 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
3945 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3946 if (!bss->wmm_used)
3947 netdev_info(sdata->dev,
3948 "disabling HT as WMM/QoS is not supported by the AP\n");
3949 }
3950
3951 /* disable VHT if we don't support it or the AP doesn't use WMM */
3952 if (!sband->vht_cap.vht_supported ||
3953 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
3954 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3955 if (!bss->wmm_used)
3956 netdev_info(sdata->dev,
3957 "disabling VHT as WMM/QoS is not supported by the AP\n");
3958 }
3959
3960 memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
3961 memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
3962 sizeof(ifmgd->ht_capa_mask));
3963
3964 if (req->ie && req->ie_len) {
3965 memcpy(assoc_data->ie, req->ie, req->ie_len);
3966 assoc_data->ie_len = req->ie_len;
3967 }
3968
3969 assoc_data->bss = req->bss;
3970
3971 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
3972 if (ifmgd->powersave)
3973 sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
3974 else
3975 sdata->smps_mode = IEEE80211_SMPS_OFF;
3976 } else
3977 sdata->smps_mode = ifmgd->req_smps;
3978
3979 assoc_data->capability = req->bss->capability;
3980 assoc_data->wmm = bss->wmm_used &&
3981 (local->hw.queues >= IEEE80211_NUM_ACS);
3982 assoc_data->supp_rates = bss->supp_rates;
3983 assoc_data->supp_rates_len = bss->supp_rates_len;
3984
3985 rcu_read_lock();
3986 ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
3987 if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
3988 assoc_data->ap_ht_param =
3989 ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
3990 else
3991 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3992 vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
3993 if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
3994 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
3995 sizeof(struct ieee80211_vht_cap));
3996 else
3997 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3998 rcu_read_unlock();
3999
4000 if (bss->wmm_used && bss->uapsd_supported &&
4001 (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
4002 assoc_data->uapsd = true;
4003 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4004 } else {
4005 assoc_data->uapsd = false;
4006 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4007 }
4008
4009 if (req->prev_bssid)
4010 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4011
4012 if (req->use_mfp) {
4013 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4014 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4015 } else {
4016 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4017 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4018 }
4019
4020 if (req->crypto.control_port)
4021 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4022 else
4023 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4024
4025 sdata->control_port_protocol = req->crypto.control_port_ethertype;
4026 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4027
4028 /* kick off associate process */
4029
4030 ifmgd->assoc_data = assoc_data;
4031 ifmgd->dtim_period = 0;
4032
4033 err = ieee80211_prep_connection(sdata, req->bss, true);
4034 if (err)
4035 goto err_clear;
4036
4037 rcu_read_lock();
4038 beacon_ies = rcu_dereference(req->bss->beacon_ies);
4039
4040 if (sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC &&
4041 !beacon_ies) {
4042 /*
4043 * Wait up to one beacon interval ...
4044 * should this be more if we miss one?
4045 */
4046 sdata_info(sdata, "waiting for beacon from %pM\n",
4047 ifmgd->bssid);
4048 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4049 assoc_data->timeout_started = true;
4050 assoc_data->need_beacon = true;
4051 } else if (beacon_ies) {
4052 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4053 beacon_ies->data,
4054 beacon_ies->len);
4055 u8 dtim_count = 0;
4056
4057 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4058 const struct ieee80211_tim_ie *tim;
4059 tim = (void *)(tim_ie + 2);
4060 ifmgd->dtim_period = tim->dtim_period;
4061 dtim_count = tim->dtim_count;
4062 }
4063 assoc_data->have_beacon = true;
4064 assoc_data->timeout = jiffies;
4065 assoc_data->timeout_started = true;
4066
4067 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
4068 sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4069 sdata->vif.bss_conf.sync_device_ts =
4070 bss->device_ts_beacon;
4071 sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4072 }
4073 } else {
4074 assoc_data->timeout = jiffies;
4075 assoc_data->timeout_started = true;
4076 }
4077 rcu_read_unlock();
4078
4079 run_again(ifmgd, assoc_data->timeout);
4080
4081 if (bss->corrupt_data) {
4082 char *corrupt_type = "data";
4083 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4084 if (bss->corrupt_data &
4085 IEEE80211_BSS_CORRUPT_PROBE_RESP)
4086 corrupt_type = "beacon and probe response";
4087 else
4088 corrupt_type = "beacon";
4089 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4090 corrupt_type = "probe response";
4091 sdata_info(sdata, "associating with AP with corrupt %s\n",
4092 corrupt_type);
4093 }
4094
4095 err = 0;
4096 goto out;
4097 err_clear:
4098 memset(ifmgd->bssid, 0, ETH_ALEN);
4099 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4100 ifmgd->assoc_data = NULL;
4101 err_free:
4102 kfree(assoc_data);
4103 out:
4104 mutex_unlock(&ifmgd->mtx);
4105
4106 return err;
4107 }
4108
4109 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4110 struct cfg80211_deauth_request *req)
4111 {
4112 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4113 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4114 bool tx = !req->local_state_change;
4115 bool sent_frame = false;
4116
4117 mutex_lock(&ifmgd->mtx);
4118
4119 sdata_info(sdata,
4120 "deauthenticating from %pM by local choice (reason=%d)\n",
4121 req->bssid, req->reason_code);
4122
4123 if (ifmgd->auth_data) {
4124 drv_mgd_prepare_tx(sdata->local, sdata);
4125 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4126 IEEE80211_STYPE_DEAUTH,
4127 req->reason_code, tx,
4128 frame_buf);
4129 ieee80211_destroy_auth_data(sdata, false);
4130 mutex_unlock(&ifmgd->mtx);
4131
4132 sent_frame = tx;
4133 goto out;
4134 }
4135
4136 if (ifmgd->associated &&
4137 ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4138 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4139 req->reason_code, tx, frame_buf);
4140 sent_frame = tx;
4141 }
4142 mutex_unlock(&ifmgd->mtx);
4143
4144 out:
4145 if (sent_frame)
4146 __cfg80211_send_deauth(sdata->dev, frame_buf,
4147 IEEE80211_DEAUTH_FRAME_LEN);
4148
4149 return 0;
4150 }
4151
4152 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4153 struct cfg80211_disassoc_request *req)
4154 {
4155 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4156 u8 bssid[ETH_ALEN];
4157 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4158
4159 mutex_lock(&ifmgd->mtx);
4160
4161 /*
4162 * cfg80211 should catch this ... but it's racy since
4163 * we can receive a disassoc frame, process it, hand it
4164 * to cfg80211 while that's in a locked section already
4165 * trying to tell us that the user wants to disconnect.
4166 */
4167 if (ifmgd->associated != req->bss) {
4168 mutex_unlock(&ifmgd->mtx);
4169 return -ENOLINK;
4170 }
4171
4172 sdata_info(sdata,
4173 "disassociating from %pM by local choice (reason=%d)\n",
4174 req->bss->bssid, req->reason_code);
4175
4176 memcpy(bssid, req->bss->bssid, ETH_ALEN);
4177 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
4178 req->reason_code, !req->local_state_change,
4179 frame_buf);
4180 mutex_unlock(&ifmgd->mtx);
4181
4182 __cfg80211_send_disassoc(sdata->dev, frame_buf,
4183 IEEE80211_DEAUTH_FRAME_LEN);
4184
4185 return 0;
4186 }
4187
4188 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4189 {
4190 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4191
4192 mutex_lock(&ifmgd->mtx);
4193 if (ifmgd->assoc_data)
4194 ieee80211_destroy_assoc_data(sdata, false);
4195 if (ifmgd->auth_data)
4196 ieee80211_destroy_auth_data(sdata, false);
4197 del_timer_sync(&ifmgd->timer);
4198 mutex_unlock(&ifmgd->mtx);
4199 }
4200
4201 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
4202 enum nl80211_cqm_rssi_threshold_event rssi_event,
4203 gfp_t gfp)
4204 {
4205 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4206
4207 trace_api_cqm_rssi_notify(sdata, rssi_event);
4208
4209 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
4210 }
4211 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
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