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>
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.
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/rtnetlink.h>
20 #include <linux/pm_qos_params.h>
21 #include <linux/crc32.h>
22 #include <linux/slab.h>
23 #include <net/mac80211.h>
24 #include <asm/unaligned.h>
26 #include "ieee80211_i.h"
27 #include "driver-ops.h"
31 static int max_nullfunc_tries = 2;
32 module_param(max_nullfunc_tries, int, 0644);
33 MODULE_PARM_DESC(max_nullfunc_tries,
34 "Maximum nullfunc tx tries before disconnecting (reason 4).");
36 static int max_probe_tries = 5;
37 module_param(max_probe_tries, int, 0644);
38 MODULE_PARM_DESC(max_probe_tries,
39 "Maximum probe tries before disconnecting (reason 4).");
42 * Beacon loss timeout is calculated as N frames times the
43 * advertised beacon interval. This may need to be somewhat
44 * higher than what hardware might detect to account for
45 * delays in the host processing frames. But since we also
46 * probe on beacon miss before declaring the connection lost
47 * default to what we want.
49 #define IEEE80211_BEACON_LOSS_COUNT 7
52 * Time the connection can be idle before we probe
53 * it to see if we can still talk to the AP.
55 #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ)
57 * Time we wait for a probe response after sending
58 * a probe request because of beacon loss or for
59 * checking the connection still works.
61 static int probe_wait_ms = 500;
62 module_param(probe_wait_ms, int, 0644);
63 MODULE_PARM_DESC(probe_wait_ms,
64 "Maximum time(ms) to wait for probe response"
65 " before disconnecting (reason 4).");
68 * Weight given to the latest Beacon frame when calculating average signal
69 * strength for Beacon frames received in the current BSS. This must be
72 #define IEEE80211_SIGNAL_AVE_WEIGHT 3
75 * How many Beacon frames need to have been used in average signal strength
76 * before starting to indicate signal change events.
78 #define IEEE80211_SIGNAL_AVE_MIN_COUNT 4
80 #define TMR_RUNNING_TIMER 0
81 #define TMR_RUNNING_CHANSW 1
84 * All cfg80211 functions have to be called outside a locked
85 * section so that they can acquire a lock themselves... This
86 * is much simpler than queuing up things in cfg80211, but we
87 * do need some indirection for that here.
90 /* no action required */
93 /* caller must call cfg80211_send_deauth() */
94 RX_MGMT_CFG80211_DEAUTH,
96 /* caller must call cfg80211_send_disassoc() */
97 RX_MGMT_CFG80211_DISASSOC,
101 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
103 lockdep_assert_held(&ifmgd->mtx);
107 * We can have multiple work items (and connection probing)
108 * scheduling this timer, but we need to take care to only
109 * reschedule it when it should fire _earlier_ than it was
110 * asked for before, or if it's not pending right now. This
111 * function ensures that. Note that it then is required to
112 * run this function for all timeouts after the first one
113 * has happened -- the work that runs from this timer will
116 static void run_again(struct ieee80211_if_managed *ifmgd,
117 unsigned long timeout)
119 ASSERT_MGD_MTX(ifmgd);
121 if (!timer_pending(&ifmgd->timer) ||
122 time_before(timeout, ifmgd->timer.expires))
123 mod_timer(&ifmgd->timer, timeout);
126 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
128 if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
131 mod_timer(&sdata->u.mgd.bcn_mon_timer,
132 round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
135 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
137 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
139 if (unlikely(!sdata->u.mgd.associated))
142 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
145 mod_timer(&sdata->u.mgd.conn_mon_timer,
146 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
148 ifmgd->probe_send_count = 0;
151 static int ecw2cw(int ecw)
153 return (1 << ecw) - 1;
157 * ieee80211_enable_ht should be called only after the operating band
158 * has been determined as ht configuration depends on the hw's
159 * HT abilities for a specific band.
161 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
162 struct ieee80211_ht_info *hti,
163 const u8 *bssid, u16 ap_ht_cap_flags)
165 struct ieee80211_local *local = sdata->local;
166 struct ieee80211_supported_band *sband;
167 struct sta_info *sta;
171 bool enable_ht = true;
172 enum nl80211_channel_type prev_chantype;
173 enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
175 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
177 prev_chantype = sdata->vif.bss_conf.channel_type;
179 /* HT is not supported */
180 if (!sband->ht_cap.ht_supported)
184 hti_cfreq = ieee80211_channel_to_frequency(hti->control_chan,
186 /* check that channel matches the right operating channel */
187 if (local->hw.conf.channel->center_freq != hti_cfreq) {
188 /* Some APs mess this up, evidently.
189 * Netgear WNDR3700 sometimes reports 4 higher than
190 * the actual channel, for instance.
193 "%s: Wrong control channel in association"
194 " response: configured center-freq: %d"
195 " hti-cfreq: %d hti->control_chan: %d"
196 " band: %d. Disabling HT.\n",
198 local->hw.conf.channel->center_freq,
199 hti_cfreq, hti->control_chan,
206 channel_type = NL80211_CHAN_HT20;
208 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
209 (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
210 (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
211 switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
212 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
213 if (!(local->hw.conf.channel->flags &
214 IEEE80211_CHAN_NO_HT40PLUS))
215 channel_type = NL80211_CHAN_HT40PLUS;
217 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
218 if (!(local->hw.conf.channel->flags &
219 IEEE80211_CHAN_NO_HT40MINUS))
220 channel_type = NL80211_CHAN_HT40MINUS;
226 if (local->tmp_channel)
227 local->tmp_channel_type = channel_type;
229 if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
230 /* can only fail due to HT40+/- mismatch */
231 channel_type = NL80211_CHAN_HT20;
232 WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type));
235 ieee80211_stop_queues_by_reason(&sdata->local->hw,
236 IEEE80211_QUEUE_STOP_REASON_CSA);
238 /* channel_type change automatically detected */
239 ieee80211_hw_config(local, 0);
241 if (prev_chantype != channel_type) {
243 sta = sta_info_get(sdata, bssid);
245 rate_control_rate_update(local, sband, sta,
246 IEEE80211_RC_HT_CHANGED,
251 ieee80211_wake_queues_by_reason(&sdata->local->hw,
252 IEEE80211_QUEUE_STOP_REASON_CSA);
254 ht_opmode = le16_to_cpu(hti->operation_mode);
256 /* if bss configuration changed store the new one */
257 if (sdata->ht_opmode_valid != enable_ht ||
258 sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
259 prev_chantype != channel_type) {
260 changed |= BSS_CHANGED_HT;
261 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
262 sdata->ht_opmode_valid = enable_ht;
268 /* frame sending functions */
270 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
271 const u8 *bssid, u16 stype, u16 reason,
272 void *cookie, bool send_frame)
274 struct ieee80211_local *local = sdata->local;
275 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
277 struct ieee80211_mgmt *mgmt;
279 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
281 printk(KERN_DEBUG "%s: failed to allocate buffer for "
282 "deauth/disassoc frame\n", sdata->name);
285 skb_reserve(skb, local->hw.extra_tx_headroom);
287 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
289 memcpy(mgmt->da, bssid, ETH_ALEN);
290 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
291 memcpy(mgmt->bssid, bssid, ETH_ALEN);
292 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
294 /* u.deauth.reason_code == u.disassoc.reason_code */
295 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
297 if (stype == IEEE80211_STYPE_DEAUTH)
299 __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
301 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
304 __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
306 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
307 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
308 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
311 ieee80211_tx_skb(sdata, skb);
316 void ieee80211_send_pspoll(struct ieee80211_local *local,
317 struct ieee80211_sub_if_data *sdata)
319 struct ieee80211_pspoll *pspoll;
322 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
326 pspoll = (struct ieee80211_pspoll *) skb->data;
327 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
329 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
330 ieee80211_tx_skb(sdata, skb);
333 void ieee80211_send_nullfunc(struct ieee80211_local *local,
334 struct ieee80211_sub_if_data *sdata,
338 struct ieee80211_hdr_3addr *nullfunc;
340 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
344 nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
346 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
348 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
349 ieee80211_tx_skb(sdata, skb);
352 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
353 struct ieee80211_sub_if_data *sdata)
356 struct ieee80211_hdr *nullfunc;
359 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
362 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
364 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
365 "nullfunc frame\n", sdata->name);
368 skb_reserve(skb, local->hw.extra_tx_headroom);
370 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
371 memset(nullfunc, 0, 30);
372 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
373 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
374 nullfunc->frame_control = fc;
375 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
376 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
377 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
378 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
380 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
381 ieee80211_tx_skb(sdata, skb);
384 /* spectrum management related things */
385 static void ieee80211_chswitch_work(struct work_struct *work)
387 struct ieee80211_sub_if_data *sdata =
388 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
389 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
391 if (!ieee80211_sdata_running(sdata))
394 mutex_lock(&ifmgd->mtx);
395 if (!ifmgd->associated)
398 sdata->local->oper_channel = sdata->local->csa_channel;
399 if (!sdata->local->ops->channel_switch) {
400 /* call "hw_config" only if doing sw channel switch */
401 ieee80211_hw_config(sdata->local,
402 IEEE80211_CONF_CHANGE_CHANNEL);
405 /* XXX: shouldn't really modify cfg80211-owned data! */
406 ifmgd->associated->channel = sdata->local->oper_channel;
408 ieee80211_wake_queues_by_reason(&sdata->local->hw,
409 IEEE80211_QUEUE_STOP_REASON_CSA);
411 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
412 mutex_unlock(&ifmgd->mtx);
415 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
417 struct ieee80211_sub_if_data *sdata;
418 struct ieee80211_if_managed *ifmgd;
420 sdata = vif_to_sdata(vif);
421 ifmgd = &sdata->u.mgd;
423 trace_api_chswitch_done(sdata, success);
426 * If the channel switch was not successful, stay
427 * around on the old channel. We currently lack
428 * good handling of this situation, possibly we
429 * should just drop the association.
431 sdata->local->csa_channel = sdata->local->oper_channel;
434 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
436 EXPORT_SYMBOL(ieee80211_chswitch_done);
438 static void ieee80211_chswitch_timer(unsigned long data)
440 struct ieee80211_sub_if_data *sdata =
441 (struct ieee80211_sub_if_data *) data;
442 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
444 if (sdata->local->quiescing) {
445 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
449 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
452 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
453 struct ieee80211_channel_sw_ie *sw_elem,
454 struct ieee80211_bss *bss,
457 struct cfg80211_bss *cbss =
458 container_of((void *)bss, struct cfg80211_bss, priv);
459 struct ieee80211_channel *new_ch;
460 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
461 int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
462 cbss->channel->band);
464 ASSERT_MGD_MTX(ifmgd);
466 if (!ifmgd->associated)
469 if (sdata->local->scanning)
472 /* Disregard subsequent beacons if we are already running a timer
475 if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
478 new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
479 if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
482 sdata->local->csa_channel = new_ch;
484 if (sdata->local->ops->channel_switch) {
485 /* use driver's channel switch callback */
486 struct ieee80211_channel_switch ch_switch;
487 memset(&ch_switch, 0, sizeof(ch_switch));
488 ch_switch.timestamp = timestamp;
490 ch_switch.block_tx = true;
491 ieee80211_stop_queues_by_reason(&sdata->local->hw,
492 IEEE80211_QUEUE_STOP_REASON_CSA);
494 ch_switch.channel = new_ch;
495 ch_switch.count = sw_elem->count;
496 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
497 drv_channel_switch(sdata->local, &ch_switch);
501 /* channel switch handled in software */
502 if (sw_elem->count <= 1) {
503 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
506 ieee80211_stop_queues_by_reason(&sdata->local->hw,
507 IEEE80211_QUEUE_STOP_REASON_CSA);
508 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
509 mod_timer(&ifmgd->chswitch_timer,
511 msecs_to_jiffies(sw_elem->count *
512 cbss->beacon_interval));
516 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
517 u16 capab_info, u8 *pwr_constr_elem,
518 u8 pwr_constr_elem_len)
520 struct ieee80211_conf *conf = &sdata->local->hw.conf;
522 if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
525 /* Power constraint IE length should be 1 octet */
526 if (pwr_constr_elem_len != 1)
529 if ((*pwr_constr_elem <= conf->channel->max_power) &&
530 (*pwr_constr_elem != sdata->local->power_constr_level)) {
531 sdata->local->power_constr_level = *pwr_constr_elem;
532 ieee80211_hw_config(sdata->local, 0);
536 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
538 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
539 struct ieee80211_local *local = sdata->local;
540 struct ieee80211_conf *conf = &local->hw.conf;
542 WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
543 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
544 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
546 local->disable_dynamic_ps = false;
547 conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
549 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
551 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
553 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
554 struct ieee80211_local *local = sdata->local;
555 struct ieee80211_conf *conf = &local->hw.conf;
557 WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
558 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
559 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
561 local->disable_dynamic_ps = true;
562 conf->dynamic_ps_timeout = 0;
563 del_timer_sync(&local->dynamic_ps_timer);
564 ieee80211_queue_work(&local->hw,
565 &local->dynamic_ps_enable_work);
567 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
570 static void ieee80211_enable_ps(struct ieee80211_local *local,
571 struct ieee80211_sub_if_data *sdata)
573 struct ieee80211_conf *conf = &local->hw.conf;
576 * If we are scanning right now then the parameters will
577 * take effect when scan finishes.
582 if (conf->dynamic_ps_timeout > 0 &&
583 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
584 mod_timer(&local->dynamic_ps_timer, jiffies +
585 msecs_to_jiffies(conf->dynamic_ps_timeout));
587 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
588 ieee80211_send_nullfunc(local, sdata, 1);
590 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
591 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
594 conf->flags |= IEEE80211_CONF_PS;
595 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
599 static void ieee80211_change_ps(struct ieee80211_local *local)
601 struct ieee80211_conf *conf = &local->hw.conf;
603 if (local->ps_sdata) {
604 ieee80211_enable_ps(local, local->ps_sdata);
605 } else if (conf->flags & IEEE80211_CONF_PS) {
606 conf->flags &= ~IEEE80211_CONF_PS;
607 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
608 del_timer_sync(&local->dynamic_ps_timer);
609 cancel_work_sync(&local->dynamic_ps_enable_work);
613 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
615 struct ieee80211_if_managed *mgd = &sdata->u.mgd;
616 struct sta_info *sta = NULL;
622 if (!mgd->associated)
625 if (!mgd->associated->beacon_ies)
628 if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
629 IEEE80211_STA_CONNECTION_POLL))
633 sta = sta_info_get(sdata, mgd->bssid);
635 sta_flags = get_sta_flags(sta);
638 if (!(sta_flags & WLAN_STA_AUTHORIZED))
644 /* need to hold RTNL or interface lock */
645 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
647 struct ieee80211_sub_if_data *sdata, *found = NULL;
651 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
652 local->ps_sdata = NULL;
656 if (!list_empty(&local->work_list)) {
657 local->ps_sdata = NULL;
661 list_for_each_entry(sdata, &local->interfaces, list) {
662 if (!ieee80211_sdata_running(sdata))
664 if (sdata->vif.type == NL80211_IFTYPE_AP) {
665 /* If an AP vif is found, then disable PS
666 * by setting the count to zero thereby setting
672 if (sdata->vif.type != NL80211_IFTYPE_STATION)
678 if (count == 1 && ieee80211_powersave_allowed(found)) {
679 struct ieee80211_conf *conf = &local->hw.conf;
683 latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
685 beaconint_us = ieee80211_tu_to_usec(
686 found->vif.bss_conf.beacon_int);
688 timeout = local->dynamic_ps_forced_timeout;
691 * Go to full PSM if the user configures a very low
692 * latency requirement.
693 * The 2000 second value is there for compatibility
694 * until the PM_QOS_NETWORK_LATENCY is configured
697 if (latency > (1900 * USEC_PER_MSEC) &&
698 latency != (2000 * USEC_PER_SEC))
703 local->dynamic_ps_user_timeout = timeout;
704 if (!local->disable_dynamic_ps)
705 conf->dynamic_ps_timeout =
706 local->dynamic_ps_user_timeout;
708 if (beaconint_us > latency) {
709 local->ps_sdata = NULL;
711 struct ieee80211_bss *bss;
715 bss = (void *)found->u.mgd.associated->priv;
716 dtimper = bss->dtim_period;
718 /* If the TIM IE is invalid, pretend the value is 1 */
721 else if (dtimper > 1)
722 maxslp = min_t(int, dtimper,
723 latency / beaconint_us);
725 local->hw.conf.max_sleep_period = maxslp;
726 local->hw.conf.ps_dtim_period = dtimper;
727 local->ps_sdata = found;
730 local->ps_sdata = NULL;
734 ieee80211_change_ps(local);
737 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
739 struct ieee80211_local *local =
740 container_of(work, struct ieee80211_local,
741 dynamic_ps_disable_work);
743 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
744 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
745 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
748 ieee80211_wake_queues_by_reason(&local->hw,
749 IEEE80211_QUEUE_STOP_REASON_PS);
752 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
754 struct ieee80211_local *local =
755 container_of(work, struct ieee80211_local,
756 dynamic_ps_enable_work);
757 struct ieee80211_sub_if_data *sdata = local->ps_sdata;
758 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
762 /* can only happen when PS was just disabled anyway */
766 if (local->hw.conf.flags & IEEE80211_CONF_PS)
770 * transmission can be stopped by others which leads to
771 * dynamic_ps_timer expiry. Postpond the ps timer if it
772 * is not the actual idle state.
774 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
775 for (q = 0; q < local->hw.queues; q++) {
776 if (local->queue_stop_reasons[q]) {
777 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
779 mod_timer(&local->dynamic_ps_timer, jiffies +
781 local->hw.conf.dynamic_ps_timeout));
785 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
787 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
788 (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED))) {
789 netif_tx_stop_all_queues(sdata->dev);
791 if (drv_tx_frames_pending(local))
792 mod_timer(&local->dynamic_ps_timer, jiffies +
794 local->hw.conf.dynamic_ps_timeout));
796 ieee80211_send_nullfunc(local, sdata, 1);
797 /* Flush to get the tx status of nullfunc frame */
798 drv_flush(local, false);
802 if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
803 (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
804 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
805 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
806 local->hw.conf.flags |= IEEE80211_CONF_PS;
807 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
810 netif_tx_wake_all_queues(sdata->dev);
813 void ieee80211_dynamic_ps_timer(unsigned long data)
815 struct ieee80211_local *local = (void *) data;
817 if (local->quiescing || local->suspended)
820 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
824 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
825 struct ieee80211_sub_if_data *sdata,
826 u8 *wmm_param, size_t wmm_param_len)
828 struct ieee80211_tx_queue_params params;
829 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
832 u8 *pos, uapsd_queues = 0;
834 if (!local->ops->conf_tx)
837 if (local->hw.queues < 4)
843 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
846 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
847 uapsd_queues = local->uapsd_queues;
849 count = wmm_param[6] & 0x0f;
850 if (count == ifmgd->wmm_last_param_set)
852 ifmgd->wmm_last_param_set = count;
855 left = wmm_param_len - 8;
857 memset(¶ms, 0, sizeof(params));
860 for (; left >= 4; left -= 4, pos += 4) {
861 int aci = (pos[0] >> 5) & 0x03;
862 int acm = (pos[0] >> 4) & 0x01;
870 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
871 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
877 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
878 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
884 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
885 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
892 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
893 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
898 params.aifs = pos[0] & 0x0f;
899 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
900 params.cw_min = ecw2cw(pos[1] & 0x0f);
901 params.txop = get_unaligned_le16(pos + 2);
902 params.uapsd = uapsd;
904 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
905 wiphy_debug(local->hw.wiphy,
906 "WMM queue=%d aci=%d acm=%d aifs=%d "
907 "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
909 params.aifs, params.cw_min, params.cw_max,
910 params.txop, params.uapsd);
912 if (drv_conf_tx(local, queue, ¶ms))
913 wiphy_debug(local->hw.wiphy,
914 "failed to set TX queue parameters for queue %d\n",
918 /* enable WMM or activate new settings */
919 sdata->vif.bss_conf.qos = true;
920 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
923 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
924 u16 capab, bool erp_valid, u8 erp)
926 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
929 bool use_short_preamble;
933 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
934 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
936 use_protection = false;
937 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
940 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
941 if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
942 use_short_slot = true;
944 if (use_protection != bss_conf->use_cts_prot) {
945 bss_conf->use_cts_prot = use_protection;
946 changed |= BSS_CHANGED_ERP_CTS_PROT;
949 if (use_short_preamble != bss_conf->use_short_preamble) {
950 bss_conf->use_short_preamble = use_short_preamble;
951 changed |= BSS_CHANGED_ERP_PREAMBLE;
954 if (use_short_slot != bss_conf->use_short_slot) {
955 bss_conf->use_short_slot = use_short_slot;
956 changed |= BSS_CHANGED_ERP_SLOT;
962 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
963 struct cfg80211_bss *cbss,
964 u32 bss_info_changed)
966 struct ieee80211_bss *bss = (void *)cbss->priv;
967 struct ieee80211_local *local = sdata->local;
968 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
970 bss_info_changed |= BSS_CHANGED_ASSOC;
971 /* set timing information */
972 bss_conf->beacon_int = cbss->beacon_interval;
973 bss_conf->timestamp = cbss->tsf;
975 bss_info_changed |= BSS_CHANGED_BEACON_INT;
976 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
977 cbss->capability, bss->has_erp_value, bss->erp_value);
979 sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
980 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
982 sdata->u.mgd.associated = cbss;
983 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
985 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
987 /* just to be sure */
988 sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
989 IEEE80211_STA_BEACON_POLL);
991 ieee80211_led_assoc(local, 1);
993 if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
994 bss_conf->dtim_period = bss->dtim_period;
996 bss_conf->dtim_period = 0;
1000 * For now just always ask the driver to update the basic rateset
1001 * when we have associated, we aren't checking whether it actually
1004 bss_info_changed |= BSS_CHANGED_BASIC_RATES;
1006 /* And the BSSID changed - we're associated now */
1007 bss_info_changed |= BSS_CHANGED_BSSID;
1009 /* Tell the driver to monitor connection quality (if supported) */
1010 if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
1011 bss_conf->cqm_rssi_thold)
1012 bss_info_changed |= BSS_CHANGED_CQM;
1014 /* Enable ARP filtering */
1015 if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
1016 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
1017 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1020 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1022 mutex_lock(&local->iflist_mtx);
1023 ieee80211_recalc_ps(local, -1);
1024 ieee80211_recalc_smps(local);
1025 mutex_unlock(&local->iflist_mtx);
1027 netif_tx_start_all_queues(sdata->dev);
1028 netif_carrier_on(sdata->dev);
1031 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1032 bool remove_sta, bool tx)
1034 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1035 struct ieee80211_local *local = sdata->local;
1036 struct sta_info *sta;
1037 u32 changed = 0, config_changed = 0;
1040 ASSERT_MGD_MTX(ifmgd);
1042 if (WARN_ON(!ifmgd->associated))
1045 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1047 ifmgd->associated = NULL;
1048 memset(ifmgd->bssid, 0, ETH_ALEN);
1051 * we need to commit the associated = NULL change because the
1052 * scan code uses that to determine whether this iface should
1053 * go to/wake up from powersave or not -- and could otherwise
1054 * wake the queues erroneously.
1059 * Thus, we can only afterwards stop the queues -- to account
1060 * for the case where another CPU is finishing a scan at this
1061 * time -- we don't want the scan code to enable queues.
1064 netif_tx_stop_all_queues(sdata->dev);
1065 netif_carrier_off(sdata->dev);
1067 mutex_lock(&local->sta_mtx);
1068 sta = sta_info_get(sdata, bssid);
1070 set_sta_flags(sta, WLAN_STA_BLOCK_BA);
1071 ieee80211_sta_tear_down_BA_sessions(sta, tx);
1073 mutex_unlock(&local->sta_mtx);
1075 changed |= ieee80211_reset_erp_info(sdata);
1077 ieee80211_led_assoc(local, 0);
1078 changed |= BSS_CHANGED_ASSOC;
1079 sdata->vif.bss_conf.assoc = false;
1081 ieee80211_set_wmm_default(sdata);
1083 /* channel(_type) changes are handled by ieee80211_hw_config */
1084 WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
1086 /* on the next assoc, re-program HT parameters */
1087 sdata->ht_opmode_valid = false;
1089 local->power_constr_level = 0;
1091 del_timer_sync(&local->dynamic_ps_timer);
1092 cancel_work_sync(&local->dynamic_ps_enable_work);
1094 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1095 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1096 config_changed |= IEEE80211_CONF_CHANGE_PS;
1099 ieee80211_hw_config(local, config_changed);
1101 /* Disable ARP filtering */
1102 if (sdata->vif.bss_conf.arp_filter_enabled) {
1103 sdata->vif.bss_conf.arp_filter_enabled = false;
1104 changed |= BSS_CHANGED_ARP_FILTER;
1107 /* The BSSID (not really interesting) and HT changed */
1108 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1109 ieee80211_bss_info_change_notify(sdata, changed);
1112 sta_info_destroy_addr(sdata, bssid);
1114 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1115 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1116 del_timer_sync(&sdata->u.mgd.timer);
1117 del_timer_sync(&sdata->u.mgd.chswitch_timer);
1120 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1121 struct ieee80211_hdr *hdr)
1124 * We can postpone the mgd.timer whenever receiving unicast frames
1125 * from AP because we know that the connection is working both ways
1126 * at that time. But multicast frames (and hence also beacons) must
1127 * be ignored here, because we need to trigger the timer during
1128 * data idle periods for sending the periodic probe request to the
1129 * AP we're connected to.
1131 if (is_multicast_ether_addr(hdr->addr1))
1134 ieee80211_sta_reset_conn_monitor(sdata);
1137 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1139 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1141 if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1142 IEEE80211_STA_CONNECTION_POLL)))
1145 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1146 IEEE80211_STA_BEACON_POLL);
1147 mutex_lock(&sdata->local->iflist_mtx);
1148 ieee80211_recalc_ps(sdata->local, -1);
1149 mutex_unlock(&sdata->local->iflist_mtx);
1151 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1155 * We've received a probe response, but are not sure whether
1156 * we have or will be receiving any beacons or data, so let's
1157 * schedule the timers again, just in case.
1159 ieee80211_sta_reset_beacon_monitor(sdata);
1161 mod_timer(&ifmgd->conn_mon_timer,
1162 round_jiffies_up(jiffies +
1163 IEEE80211_CONNECTION_IDLE_TIME));
1166 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1167 struct ieee80211_hdr *hdr, bool ack)
1169 if (!ieee80211_is_data(hdr->frame_control))
1173 ieee80211_sta_reset_conn_monitor(sdata);
1175 if (ieee80211_is_nullfunc(hdr->frame_control) &&
1176 sdata->u.mgd.probe_send_count > 0) {
1178 sdata->u.mgd.probe_send_count = 0;
1180 sdata->u.mgd.nullfunc_failed = true;
1181 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1185 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1187 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1189 u8 *dst = ifmgd->associated->bssid;
1190 u8 unicast_limit = max(1, max_probe_tries - 3);
1193 * Try sending broadcast probe requests for the last three
1194 * probe requests after the first ones failed since some
1195 * buggy APs only support broadcast probe requests.
1197 if (ifmgd->probe_send_count >= unicast_limit)
1201 * When the hardware reports an accurate Tx ACK status, it's
1202 * better to send a nullfunc frame instead of a probe request,
1203 * as it will kick us off the AP quickly if we aren't associated
1204 * anymore. The timeout will be reset if the frame is ACKed by
1207 if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1208 ifmgd->nullfunc_failed = false;
1209 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1211 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1212 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid[1], NULL, 0);
1215 ifmgd->probe_send_count++;
1216 ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1217 run_again(ifmgd, ifmgd->probe_timeout);
1220 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1223 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1224 bool already = false;
1226 if (!ieee80211_sdata_running(sdata))
1229 if (sdata->local->scanning)
1232 if (sdata->local->tmp_channel)
1235 mutex_lock(&ifmgd->mtx);
1237 if (!ifmgd->associated)
1240 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1241 if (beacon && net_ratelimit())
1242 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1243 "- sending probe request\n", sdata->name);
1247 * The driver/our work has already reported this event or the
1248 * connection monitoring has kicked in and we have already sent
1249 * a probe request. Or maybe the AP died and the driver keeps
1250 * reporting until we disassociate...
1252 * In either case we have to ignore the current call to this
1253 * function (except for setting the correct probe reason bit)
1254 * because otherwise we would reset the timer every time and
1255 * never check whether we received a probe response!
1257 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1258 IEEE80211_STA_CONNECTION_POLL))
1262 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1264 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1269 mutex_lock(&sdata->local->iflist_mtx);
1270 ieee80211_recalc_ps(sdata->local, -1);
1271 mutex_unlock(&sdata->local->iflist_mtx);
1273 ifmgd->probe_send_count = 0;
1274 ieee80211_mgd_probe_ap_send(sdata);
1276 mutex_unlock(&ifmgd->mtx);
1279 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1280 struct ieee80211_vif *vif)
1282 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1283 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1284 struct sk_buff *skb;
1287 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1290 ASSERT_MGD_MTX(ifmgd);
1292 if (!ifmgd->associated)
1295 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1296 skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid,
1297 ssid + 2, ssid[1], NULL, 0);
1301 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1303 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1305 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1306 struct ieee80211_local *local = sdata->local;
1309 mutex_lock(&ifmgd->mtx);
1310 if (!ifmgd->associated) {
1311 mutex_unlock(&ifmgd->mtx);
1315 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1317 printk(KERN_DEBUG "%s: Connection to AP %pM lost.\n",
1318 sdata->name, bssid);
1320 ieee80211_set_disassoc(sdata, true, true);
1321 mutex_unlock(&ifmgd->mtx);
1323 mutex_lock(&local->mtx);
1324 ieee80211_recalc_idle(local);
1325 mutex_unlock(&local->mtx);
1327 * must be outside lock due to cfg80211,
1328 * but that's not a problem.
1330 ieee80211_send_deauth_disassoc(sdata, bssid,
1331 IEEE80211_STYPE_DEAUTH,
1332 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1336 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1338 struct ieee80211_sub_if_data *sdata =
1339 container_of(work, struct ieee80211_sub_if_data,
1340 u.mgd.beacon_connection_loss_work);
1342 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1343 __ieee80211_connection_loss(sdata);
1345 ieee80211_mgd_probe_ap(sdata, true);
1348 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1350 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1351 struct ieee80211_hw *hw = &sdata->local->hw;
1353 trace_api_beacon_loss(sdata);
1355 WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1356 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1358 EXPORT_SYMBOL(ieee80211_beacon_loss);
1360 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1362 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1363 struct ieee80211_hw *hw = &sdata->local->hw;
1365 trace_api_connection_loss(sdata);
1367 WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1368 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1370 EXPORT_SYMBOL(ieee80211_connection_loss);
1373 static enum rx_mgmt_action __must_check
1374 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1375 struct ieee80211_mgmt *mgmt, size_t len)
1377 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1378 const u8 *bssid = NULL;
1382 return RX_MGMT_NONE;
1384 ASSERT_MGD_MTX(ifmgd);
1386 bssid = ifmgd->associated->bssid;
1388 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1390 printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1391 sdata->name, bssid, reason_code);
1393 ieee80211_set_disassoc(sdata, true, false);
1394 mutex_lock(&sdata->local->mtx);
1395 ieee80211_recalc_idle(sdata->local);
1396 mutex_unlock(&sdata->local->mtx);
1398 return RX_MGMT_CFG80211_DEAUTH;
1402 static enum rx_mgmt_action __must_check
1403 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1404 struct ieee80211_mgmt *mgmt, size_t len)
1406 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1410 return RX_MGMT_NONE;
1412 ASSERT_MGD_MTX(ifmgd);
1414 if (WARN_ON(!ifmgd->associated))
1415 return RX_MGMT_NONE;
1417 if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1418 return RX_MGMT_NONE;
1420 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1422 printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1423 sdata->name, mgmt->sa, reason_code);
1425 ieee80211_set_disassoc(sdata, true, false);
1426 mutex_lock(&sdata->local->mtx);
1427 ieee80211_recalc_idle(sdata->local);
1428 mutex_unlock(&sdata->local->mtx);
1429 return RX_MGMT_CFG80211_DISASSOC;
1433 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1434 struct ieee80211_mgmt *mgmt, size_t len)
1436 struct ieee80211_sub_if_data *sdata = wk->sdata;
1437 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1438 struct ieee80211_local *local = sdata->local;
1439 struct ieee80211_supported_band *sband;
1440 struct sta_info *sta;
1441 struct cfg80211_bss *cbss = wk->assoc.bss;
1443 u32 rates, basic_rates;
1444 u16 capab_info, aid;
1445 struct ieee802_11_elems elems;
1446 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1449 bool have_higher_than_11mbit = false;
1450 u16 ap_ht_cap_flags;
1452 /* AssocResp and ReassocResp have identical structure */
1454 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1455 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1457 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1458 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1459 "set\n", sdata->name, aid);
1460 aid &= ~(BIT(15) | BIT(14));
1462 pos = mgmt->u.assoc_resp.variable;
1463 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1465 if (!elems.supp_rates) {
1466 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1473 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1475 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1476 " the AP\n", sdata->name);
1480 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1482 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1483 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1487 sband = local->hw.wiphy->bands[wk->chan->band];
1489 for (i = 0; i < elems.supp_rates_len; i++) {
1490 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1491 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1494 have_higher_than_11mbit = true;
1496 for (j = 0; j < sband->n_bitrates; j++) {
1497 if (sband->bitrates[j].bitrate == rate) {
1500 basic_rates |= BIT(j);
1506 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1507 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1508 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1511 have_higher_than_11mbit = true;
1513 for (j = 0; j < sband->n_bitrates; j++) {
1514 if (sband->bitrates[j].bitrate == rate) {
1517 basic_rates |= BIT(j);
1523 sta->sta.supp_rates[wk->chan->band] = rates;
1524 sdata->vif.bss_conf.basic_rates = basic_rates;
1526 /* cf. IEEE 802.11 9.2.12 */
1527 if (wk->chan->band == IEEE80211_BAND_2GHZ &&
1528 have_higher_than_11mbit)
1529 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1531 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1533 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1534 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1535 elems.ht_cap_elem, &sta->sta.ht_cap);
1537 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1539 rate_control_rate_init(sta);
1541 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1542 set_sta_flags(sta, WLAN_STA_MFP);
1544 if (elems.wmm_param)
1545 set_sta_flags(sta, WLAN_STA_WME);
1547 err = sta_info_insert(sta);
1550 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1551 " the AP (error %d)\n", sdata->name, err);
1556 * Always handle WMM once after association regardless
1557 * of the first value the AP uses. Setting -1 here has
1558 * that effect because the AP values is an unsigned
1561 ifmgd->wmm_last_param_set = -1;
1563 if (elems.wmm_param)
1564 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1565 elems.wmm_param_len);
1567 ieee80211_set_wmm_default(sdata);
1569 local->oper_channel = wk->chan;
1571 if (elems.ht_info_elem && elems.wmm_param &&
1572 (sdata->local->hw.queues >= 4) &&
1573 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1574 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1575 cbss->bssid, ap_ht_cap_flags);
1577 /* set AID and assoc capability,
1578 * ieee80211_set_associated() will tell the driver */
1579 bss_conf->aid = aid;
1580 bss_conf->assoc_capability = capab_info;
1581 ieee80211_set_associated(sdata, cbss, changed);
1584 * If we're using 4-addr mode, let the AP know that we're
1585 * doing so, so that it can create the STA VLAN on its side
1587 if (ifmgd->use_4addr)
1588 ieee80211_send_4addr_nullfunc(local, sdata);
1591 * Start timer to probe the connection to the AP now.
1592 * Also start the timer that will detect beacon loss.
1594 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1595 ieee80211_sta_reset_beacon_monitor(sdata);
1601 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1602 struct ieee80211_mgmt *mgmt,
1604 struct ieee80211_rx_status *rx_status,
1605 struct ieee802_11_elems *elems,
1608 struct ieee80211_local *local = sdata->local;
1610 struct ieee80211_bss *bss;
1611 struct ieee80211_channel *channel;
1612 bool need_ps = false;
1614 if (sdata->u.mgd.associated) {
1615 bss = (void *)sdata->u.mgd.associated->priv;
1616 /* not previously set so we may need to recalc */
1617 need_ps = !bss->dtim_period;
1620 if (elems->ds_params && elems->ds_params_len == 1)
1621 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
1624 freq = rx_status->freq;
1626 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1628 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1631 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1634 ieee80211_rx_bss_put(local, bss);
1636 if (!sdata->u.mgd.associated)
1640 mutex_lock(&local->iflist_mtx);
1641 ieee80211_recalc_ps(local, -1);
1642 mutex_unlock(&local->iflist_mtx);
1645 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1646 (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1648 struct ieee80211_channel_sw_ie *sw_elem =
1649 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1650 ieee80211_sta_process_chanswitch(sdata, sw_elem,
1651 bss, rx_status->mactime);
1656 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1657 struct sk_buff *skb)
1659 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1660 struct ieee80211_if_managed *ifmgd;
1661 struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1662 size_t baselen, len = skb->len;
1663 struct ieee802_11_elems elems;
1665 ifmgd = &sdata->u.mgd;
1667 ASSERT_MGD_MTX(ifmgd);
1669 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1670 return; /* ignore ProbeResp to foreign address */
1672 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1676 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1679 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1681 if (ifmgd->associated &&
1682 memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0)
1683 ieee80211_reset_ap_probe(sdata);
1687 * This is the canonical list of information elements we care about,
1688 * the filter code also gives us all changes to the Microsoft OUI
1689 * (00:50:F2) vendor IE which is used for WMM which we need to track.
1691 * We implement beacon filtering in software since that means we can
1692 * avoid processing the frame here and in cfg80211, and userspace
1693 * will not be able to tell whether the hardware supports it or not.
1695 * XXX: This list needs to be dynamic -- userspace needs to be able to
1696 * add items it requires. It also needs to be able to tell us to
1697 * look out for other vendor IEs.
1699 static const u64 care_about_ies =
1700 (1ULL << WLAN_EID_COUNTRY) |
1701 (1ULL << WLAN_EID_ERP_INFO) |
1702 (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1703 (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1704 (1ULL << WLAN_EID_HT_CAPABILITY) |
1705 (1ULL << WLAN_EID_HT_INFORMATION);
1707 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1708 struct ieee80211_mgmt *mgmt,
1710 struct ieee80211_rx_status *rx_status)
1712 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1713 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1715 struct ieee802_11_elems elems;
1716 struct ieee80211_local *local = sdata->local;
1718 bool erp_valid, directed_tim = false;
1723 ASSERT_MGD_MTX(ifmgd);
1725 /* Process beacon from the current BSS */
1726 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1730 if (rx_status->freq != local->hw.conf.channel->center_freq)
1734 * We might have received a number of frames, among them a
1735 * disassoc frame and a beacon...
1737 if (!ifmgd->associated)
1740 bssid = ifmgd->associated->bssid;
1743 * And in theory even frames from a different AP we were just
1744 * associated to a split-second ago!
1746 if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1749 /* Track average RSSI from the Beacon frames of the current AP */
1750 ifmgd->last_beacon_signal = rx_status->signal;
1751 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1752 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1753 ifmgd->ave_beacon_signal = rx_status->signal * 16;
1754 ifmgd->last_cqm_event_signal = 0;
1755 ifmgd->count_beacon_signal = 1;
1757 ifmgd->ave_beacon_signal =
1758 (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1759 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1760 ifmgd->ave_beacon_signal) / 16;
1761 ifmgd->count_beacon_signal++;
1763 if (bss_conf->cqm_rssi_thold &&
1764 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
1765 !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1766 int sig = ifmgd->ave_beacon_signal / 16;
1767 int last_event = ifmgd->last_cqm_event_signal;
1768 int thold = bss_conf->cqm_rssi_thold;
1769 int hyst = bss_conf->cqm_rssi_hyst;
1771 (last_event == 0 || sig < last_event - hyst)) {
1772 ifmgd->last_cqm_event_signal = sig;
1773 ieee80211_cqm_rssi_notify(
1775 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1777 } else if (sig > thold &&
1778 (last_event == 0 || sig > last_event + hyst)) {
1779 ifmgd->last_cqm_event_signal = sig;
1780 ieee80211_cqm_rssi_notify(
1782 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1787 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1788 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1789 if (net_ratelimit()) {
1790 printk(KERN_DEBUG "%s: cancelling probereq poll due "
1791 "to a received beacon\n", sdata->name);
1794 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1795 mutex_lock(&local->iflist_mtx);
1796 ieee80211_recalc_ps(local, -1);
1797 mutex_unlock(&local->iflist_mtx);
1801 * Push the beacon loss detection into the future since
1802 * we are processing a beacon from the AP just now.
1804 ieee80211_sta_reset_beacon_monitor(sdata);
1806 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1807 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1808 len - baselen, &elems,
1809 care_about_ies, ncrc);
1811 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1812 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1815 if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) {
1816 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1819 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1820 elems.wmm_param_len);
1823 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1825 if (local->hw.conf.dynamic_ps_timeout > 0) {
1826 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1827 ieee80211_hw_config(local,
1828 IEEE80211_CONF_CHANGE_PS);
1829 ieee80211_send_nullfunc(local, sdata, 0);
1831 local->pspolling = true;
1834 * Here is assumed that the driver will be
1835 * able to send ps-poll frame and receive a
1836 * response even though power save mode is
1837 * enabled, but some drivers might require
1838 * to disable power save here. This needs
1839 * to be investigated.
1841 ieee80211_send_pspoll(local, sdata);
1846 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
1848 ifmgd->beacon_crc = ncrc;
1849 ifmgd->beacon_crc_valid = true;
1851 if (elems.erp_info && elems.erp_info_len >= 1) {
1853 erp_value = elems.erp_info[0];
1857 changed |= ieee80211_handle_bss_capability(sdata,
1858 le16_to_cpu(mgmt->u.beacon.capab_info),
1859 erp_valid, erp_value);
1862 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1863 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1864 struct sta_info *sta;
1865 struct ieee80211_supported_band *sband;
1866 u16 ap_ht_cap_flags;
1870 sta = sta_info_get(sdata, bssid);
1871 if (WARN_ON(!sta)) {
1876 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1878 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1879 elems.ht_cap_elem, &sta->sta.ht_cap);
1881 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1885 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1886 bssid, ap_ht_cap_flags);
1889 /* Note: country IE parsing is done for us by cfg80211 */
1890 if (elems.country_elem) {
1891 /* TODO: IBSS also needs this */
1892 if (elems.pwr_constr_elem)
1893 ieee80211_handle_pwr_constr(sdata,
1894 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1895 elems.pwr_constr_elem,
1896 elems.pwr_constr_elem_len);
1899 ieee80211_bss_info_change_notify(sdata, changed);
1902 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1903 struct sk_buff *skb)
1905 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1906 struct ieee80211_rx_status *rx_status;
1907 struct ieee80211_mgmt *mgmt;
1908 enum rx_mgmt_action rma = RX_MGMT_NONE;
1911 rx_status = (struct ieee80211_rx_status *) skb->cb;
1912 mgmt = (struct ieee80211_mgmt *) skb->data;
1913 fc = le16_to_cpu(mgmt->frame_control);
1915 mutex_lock(&ifmgd->mtx);
1917 if (ifmgd->associated &&
1918 memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1919 switch (fc & IEEE80211_FCTL_STYPE) {
1920 case IEEE80211_STYPE_BEACON:
1921 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1924 case IEEE80211_STYPE_PROBE_RESP:
1925 ieee80211_rx_mgmt_probe_resp(sdata, skb);
1927 case IEEE80211_STYPE_DEAUTH:
1928 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1930 case IEEE80211_STYPE_DISASSOC:
1931 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1933 case IEEE80211_STYPE_ACTION:
1934 switch (mgmt->u.action.category) {
1935 case WLAN_CATEGORY_SPECTRUM_MGMT:
1936 ieee80211_sta_process_chanswitch(sdata,
1937 &mgmt->u.action.u.chan_switch.sw_elem,
1938 (void *)ifmgd->associated->priv,
1939 rx_status->mactime);
1943 mutex_unlock(&ifmgd->mtx);
1949 case RX_MGMT_CFG80211_DEAUTH:
1950 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1952 case RX_MGMT_CFG80211_DISASSOC:
1953 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1956 WARN(1, "unexpected: %d", rma);
1961 mutex_unlock(&ifmgd->mtx);
1963 if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1964 (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) {
1965 struct ieee80211_local *local = sdata->local;
1966 struct ieee80211_work *wk;
1968 mutex_lock(&local->mtx);
1969 list_for_each_entry(wk, &local->work_list, list) {
1970 if (wk->sdata != sdata)
1973 if (wk->type != IEEE80211_WORK_ASSOC &&
1974 wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
1977 if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN))
1979 if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN))
1983 * Printing the message only here means we can't
1984 * spuriously print it, but it also means that it
1985 * won't be printed when the frame comes in before
1986 * we even tried to associate or in similar cases.
1988 * Ultimately, I suspect cfg80211 should print the
1992 "%s: deauthenticated from %pM (Reason: %u)\n",
1993 sdata->name, mgmt->bssid,
1994 le16_to_cpu(mgmt->u.deauth.reason_code));
1996 list_del_rcu(&wk->list);
2000 mutex_unlock(&local->mtx);
2002 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2006 static void ieee80211_sta_timer(unsigned long data)
2008 struct ieee80211_sub_if_data *sdata =
2009 (struct ieee80211_sub_if_data *) data;
2010 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2011 struct ieee80211_local *local = sdata->local;
2013 if (local->quiescing) {
2014 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2018 ieee80211_queue_work(&local->hw, &sdata->work);
2021 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2024 struct ieee80211_local *local = sdata->local;
2025 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2027 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
2028 IEEE80211_STA_BEACON_POLL);
2030 ieee80211_set_disassoc(sdata, true, true);
2031 mutex_unlock(&ifmgd->mtx);
2032 mutex_lock(&local->mtx);
2033 ieee80211_recalc_idle(local);
2034 mutex_unlock(&local->mtx);
2036 * must be outside lock due to cfg80211,
2037 * but that's not a problem.
2039 ieee80211_send_deauth_disassoc(sdata, bssid,
2040 IEEE80211_STYPE_DEAUTH,
2041 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2043 mutex_lock(&ifmgd->mtx);
2046 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2048 struct ieee80211_local *local = sdata->local;
2049 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2051 /* then process the rest of the work */
2052 mutex_lock(&ifmgd->mtx);
2054 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2055 IEEE80211_STA_CONNECTION_POLL) &&
2056 ifmgd->associated) {
2060 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2062 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2063 max_tries = max_nullfunc_tries;
2065 max_tries = max_probe_tries;
2067 /* ACK received for nullfunc probing frame */
2068 if (!ifmgd->probe_send_count)
2069 ieee80211_reset_ap_probe(sdata);
2070 else if (ifmgd->nullfunc_failed) {
2071 if (ifmgd->probe_send_count < max_tries) {
2072 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2073 wiphy_debug(local->hw.wiphy,
2074 "%s: No ack for nullfunc frame to"
2075 " AP %pM, try %d/%i\n",
2077 ifmgd->probe_send_count, max_tries);
2079 ieee80211_mgd_probe_ap_send(sdata);
2081 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2082 wiphy_debug(local->hw.wiphy,
2083 "%s: No ack for nullfunc frame to"
2084 " AP %pM, disconnecting.\n",
2085 sdata->name, bssid);
2087 ieee80211_sta_connection_lost(sdata, bssid);
2089 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
2090 run_again(ifmgd, ifmgd->probe_timeout);
2091 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2092 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2093 wiphy_debug(local->hw.wiphy,
2094 "%s: Failed to send nullfunc to AP %pM"
2095 " after %dms, disconnecting.\n",
2097 bssid, probe_wait_ms);
2099 ieee80211_sta_connection_lost(sdata, bssid);
2100 } else if (ifmgd->probe_send_count < max_tries) {
2101 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2102 wiphy_debug(local->hw.wiphy,
2103 "%s: No probe response from AP %pM"
2104 " after %dms, try %d/%i\n",
2106 bssid, probe_wait_ms,
2107 ifmgd->probe_send_count, max_tries);
2109 ieee80211_mgd_probe_ap_send(sdata);
2112 * We actually lost the connection ... or did we?
2115 wiphy_debug(local->hw.wiphy,
2116 "%s: No probe response from AP %pM"
2117 " after %dms, disconnecting.\n",
2119 bssid, probe_wait_ms);
2121 ieee80211_sta_connection_lost(sdata, bssid);
2125 mutex_unlock(&ifmgd->mtx);
2128 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2130 struct ieee80211_sub_if_data *sdata =
2131 (struct ieee80211_sub_if_data *) data;
2132 struct ieee80211_local *local = sdata->local;
2134 if (local->quiescing)
2137 ieee80211_queue_work(&sdata->local->hw,
2138 &sdata->u.mgd.beacon_connection_loss_work);
2141 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2143 struct ieee80211_sub_if_data *sdata =
2144 (struct ieee80211_sub_if_data *) data;
2145 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2146 struct ieee80211_local *local = sdata->local;
2148 if (local->quiescing)
2151 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2154 static void ieee80211_sta_monitor_work(struct work_struct *work)
2156 struct ieee80211_sub_if_data *sdata =
2157 container_of(work, struct ieee80211_sub_if_data,
2158 u.mgd.monitor_work);
2160 ieee80211_mgd_probe_ap(sdata, false);
2163 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2165 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2166 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
2167 IEEE80211_STA_CONNECTION_POLL);
2169 /* let's probe the connection once */
2170 ieee80211_queue_work(&sdata->local->hw,
2171 &sdata->u.mgd.monitor_work);
2172 /* and do all the other regular work too */
2173 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2178 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2180 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2183 * we need to use atomic bitops for the running bits
2184 * only because both timers might fire at the same
2185 * time -- the code here is properly synchronised.
2188 cancel_work_sync(&ifmgd->request_smps_work);
2190 cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2191 if (del_timer_sync(&ifmgd->timer))
2192 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2194 cancel_work_sync(&ifmgd->chswitch_work);
2195 if (del_timer_sync(&ifmgd->chswitch_timer))
2196 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2198 cancel_work_sync(&ifmgd->monitor_work);
2199 /* these will just be re-established on connection */
2200 del_timer_sync(&ifmgd->conn_mon_timer);
2201 del_timer_sync(&ifmgd->bcn_mon_timer);
2204 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2206 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2208 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2209 add_timer(&ifmgd->timer);
2210 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2211 add_timer(&ifmgd->chswitch_timer);
2212 ieee80211_sta_reset_beacon_monitor(sdata);
2213 ieee80211_restart_sta_timer(sdata);
2217 /* interface setup */
2218 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2220 struct ieee80211_if_managed *ifmgd;
2222 ifmgd = &sdata->u.mgd;
2223 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2224 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2225 INIT_WORK(&ifmgd->beacon_connection_loss_work,
2226 ieee80211_beacon_connection_loss_work);
2227 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
2228 setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2229 (unsigned long) sdata);
2230 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2231 (unsigned long) sdata);
2232 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2233 (unsigned long) sdata);
2234 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2235 (unsigned long) sdata);
2239 mutex_init(&ifmgd->mtx);
2241 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
2242 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
2244 ifmgd->req_smps = IEEE80211_SMPS_OFF;
2247 /* scan finished notification */
2248 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2250 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2252 /* Restart STA timers */
2254 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2255 ieee80211_restart_sta_timer(sdata);
2259 int ieee80211_max_network_latency(struct notifier_block *nb,
2260 unsigned long data, void *dummy)
2262 s32 latency_usec = (s32) data;
2263 struct ieee80211_local *local =
2264 container_of(nb, struct ieee80211_local,
2265 network_latency_notifier);
2267 mutex_lock(&local->iflist_mtx);
2268 ieee80211_recalc_ps(local, latency_usec);
2269 mutex_unlock(&local->iflist_mtx);
2275 static enum work_done_result
2276 ieee80211_probe_auth_done(struct ieee80211_work *wk,
2277 struct sk_buff *skb)
2280 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
2281 return WORK_DONE_DESTROY;
2284 if (wk->type == IEEE80211_WORK_AUTH) {
2285 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
2286 return WORK_DONE_DESTROY;
2289 mutex_lock(&wk->sdata->u.mgd.mtx);
2290 ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
2291 mutex_unlock(&wk->sdata->u.mgd.mtx);
2293 wk->type = IEEE80211_WORK_AUTH;
2294 wk->probe_auth.tries = 0;
2295 return WORK_DONE_REQUEUE;
2298 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2299 struct cfg80211_auth_request *req)
2302 struct ieee80211_work *wk;
2305 if (req->local_state_change)
2306 return 0; /* no need to update mac80211 state */
2308 switch (req->auth_type) {
2309 case NL80211_AUTHTYPE_OPEN_SYSTEM:
2310 auth_alg = WLAN_AUTH_OPEN;
2312 case NL80211_AUTHTYPE_SHARED_KEY:
2313 if (IS_ERR(sdata->local->wep_tx_tfm))
2315 auth_alg = WLAN_AUTH_SHARED_KEY;
2317 case NL80211_AUTHTYPE_FT:
2318 auth_alg = WLAN_AUTH_FT;
2320 case NL80211_AUTHTYPE_NETWORK_EAP:
2321 auth_alg = WLAN_AUTH_LEAP;
2327 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2331 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2333 if (req->ie && req->ie_len) {
2334 memcpy(wk->ie, req->ie, req->ie_len);
2335 wk->ie_len = req->ie_len;
2338 if (req->key && req->key_len) {
2339 wk->probe_auth.key_len = req->key_len;
2340 wk->probe_auth.key_idx = req->key_idx;
2341 memcpy(wk->probe_auth.key, req->key, req->key_len);
2344 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2345 memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
2346 wk->probe_auth.ssid_len = ssid[1];
2348 wk->probe_auth.algorithm = auth_alg;
2349 wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
2351 /* if we already have a probe, don't probe again */
2352 if (req->bss->proberesp_ies)
2353 wk->type = IEEE80211_WORK_AUTH;
2355 wk->type = IEEE80211_WORK_DIRECT_PROBE;
2356 wk->chan = req->bss->channel;
2357 wk->chan_type = NL80211_CHAN_NO_HT;
2359 wk->done = ieee80211_probe_auth_done;
2361 ieee80211_add_work(wk);
2365 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
2366 struct sk_buff *skb)
2368 struct ieee80211_mgmt *mgmt;
2369 struct ieee80211_rx_status *rx_status;
2370 struct ieee802_11_elems elems;
2374 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
2375 return WORK_DONE_DESTROY;
2378 if (wk->type == IEEE80211_WORK_ASSOC_BEACON_WAIT) {
2379 mutex_lock(&wk->sdata->u.mgd.mtx);
2380 rx_status = (void *) skb->cb;
2381 ieee802_11_parse_elems(skb->data + 24 + 12, skb->len - 24 - 12, &elems);
2382 ieee80211_rx_bss_info(wk->sdata, (void *)skb->data, skb->len, rx_status,
2384 mutex_unlock(&wk->sdata->u.mgd.mtx);
2386 wk->type = IEEE80211_WORK_ASSOC;
2387 /* not really done yet */
2388 return WORK_DONE_REQUEUE;
2391 mgmt = (void *)skb->data;
2392 status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2394 if (status == WLAN_STATUS_SUCCESS) {
2395 mutex_lock(&wk->sdata->u.mgd.mtx);
2396 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
2397 mutex_unlock(&wk->sdata->u.mgd.mtx);
2398 /* oops -- internal error -- send timeout for now */
2399 cfg80211_send_assoc_timeout(wk->sdata->dev,
2401 return WORK_DONE_DESTROY;
2404 mutex_unlock(&wk->sdata->u.mgd.mtx);
2407 cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2408 return WORK_DONE_DESTROY;
2411 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2412 struct cfg80211_assoc_request *req)
2414 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2415 struct ieee80211_bss *bss = (void *)req->bss->priv;
2416 struct ieee80211_work *wk;
2420 mutex_lock(&ifmgd->mtx);
2421 if (ifmgd->associated) {
2422 if (!req->prev_bssid ||
2423 memcmp(req->prev_bssid, ifmgd->associated->bssid,
2426 * We are already associated and the request was not a
2427 * reassociation request from the current BSS, so
2430 mutex_unlock(&ifmgd->mtx);
2434 /* Trying to reassociate - clear previous association state */
2435 ieee80211_set_disassoc(sdata, true, false);
2437 mutex_unlock(&ifmgd->mtx);
2439 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2443 ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2444 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2446 ifmgd->beacon_crc_valid = false;
2448 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2449 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2450 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2451 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2452 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2455 if (req->ie && req->ie_len) {
2456 memcpy(wk->ie, req->ie, req->ie_len);
2457 wk->ie_len = req->ie_len;
2461 wk->assoc.bss = req->bss;
2463 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2465 /* new association always uses requested smps mode */
2466 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2467 if (ifmgd->powersave)
2468 ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2470 ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2472 ifmgd->ap_smps = ifmgd->req_smps;
2474 wk->assoc.smps = ifmgd->ap_smps;
2476 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2477 * We still associate in non-HT mode (11a/b/g) if any one of these
2478 * ciphers is configured as pairwise.
2479 * We can set this to true for non-11n hardware, that'll be checked
2480 * separately along with the peer capabilities.
2482 wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2483 wk->assoc.capability = req->bss->capability;
2484 wk->assoc.wmm_used = bss->wmm_used;
2485 wk->assoc.supp_rates = bss->supp_rates;
2486 wk->assoc.supp_rates_len = bss->supp_rates_len;
2487 wk->assoc.ht_information_ie =
2488 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2490 if (bss->wmm_used && bss->uapsd_supported &&
2491 (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2492 wk->assoc.uapsd_used = true;
2493 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2495 wk->assoc.uapsd_used = false;
2496 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2499 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2500 memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2501 wk->assoc.ssid_len = ssid[1];
2503 if (req->prev_bssid)
2504 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2506 wk->chan = req->bss->channel;
2507 wk->chan_type = NL80211_CHAN_NO_HT;
2509 wk->done = ieee80211_assoc_done;
2510 if (!bss->dtim_period &&
2511 sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
2512 wk->type = IEEE80211_WORK_ASSOC_BEACON_WAIT;
2514 wk->type = IEEE80211_WORK_ASSOC;
2517 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2518 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2520 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2521 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2524 if (req->crypto.control_port)
2525 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2527 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2529 sdata->control_port_protocol = req->crypto.control_port_ethertype;
2530 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
2532 ieee80211_add_work(wk);
2536 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2537 struct cfg80211_deauth_request *req,
2540 struct ieee80211_local *local = sdata->local;
2541 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2542 struct ieee80211_work *wk;
2544 bool assoc_bss = false;
2546 mutex_lock(&ifmgd->mtx);
2548 memcpy(bssid, req->bss->bssid, ETH_ALEN);
2549 if (ifmgd->associated == req->bss) {
2550 ieee80211_set_disassoc(sdata, false, true);
2551 mutex_unlock(&ifmgd->mtx);
2554 bool not_auth_yet = false;
2556 mutex_unlock(&ifmgd->mtx);
2558 mutex_lock(&local->mtx);
2559 list_for_each_entry(wk, &local->work_list, list) {
2560 if (wk->sdata != sdata)
2563 if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2564 wk->type != IEEE80211_WORK_AUTH &&
2565 wk->type != IEEE80211_WORK_ASSOC &&
2566 wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
2569 if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2572 not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2573 list_del_rcu(&wk->list);
2577 mutex_unlock(&local->mtx);
2580 * If somebody requests authentication and we haven't
2581 * sent out an auth frame yet there's no need to send
2582 * out a deauth frame either. If the state was PROBE,
2583 * then this is the case. If it's AUTH we have sent a
2584 * frame, and if it's IDLE we have completed the auth
2588 __cfg80211_auth_canceled(sdata->dev, bssid);
2593 printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2594 sdata->name, bssid, req->reason_code);
2596 ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2597 req->reason_code, cookie,
2598 !req->local_state_change);
2600 sta_info_destroy_addr(sdata, bssid);
2602 mutex_lock(&sdata->local->mtx);
2603 ieee80211_recalc_idle(sdata->local);
2604 mutex_unlock(&sdata->local->mtx);
2609 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2610 struct cfg80211_disassoc_request *req,
2613 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2616 mutex_lock(&ifmgd->mtx);
2619 * cfg80211 should catch this ... but it's racy since
2620 * we can receive a disassoc frame, process it, hand it
2621 * to cfg80211 while that's in a locked section already
2622 * trying to tell us that the user wants to disconnect.
2624 if (ifmgd->associated != req->bss) {
2625 mutex_unlock(&ifmgd->mtx);
2629 printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2630 sdata->name, req->bss->bssid, req->reason_code);
2632 memcpy(bssid, req->bss->bssid, ETH_ALEN);
2633 ieee80211_set_disassoc(sdata, false, true);
2635 mutex_unlock(&ifmgd->mtx);
2637 ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2638 IEEE80211_STYPE_DISASSOC, req->reason_code,
2639 cookie, !req->local_state_change);
2640 sta_info_destroy_addr(sdata, bssid);
2642 mutex_lock(&sdata->local->mtx);
2643 ieee80211_recalc_idle(sdata->local);
2644 mutex_unlock(&sdata->local->mtx);
2649 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2650 enum nl80211_cqm_rssi_threshold_event rssi_event,
2653 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2655 trace_api_cqm_rssi_notify(sdata, rssi_event);
2657 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2659 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);