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 /* channel_type change automatically detected */
236 ieee80211_hw_config(local, 0);
238 if (prev_chantype != channel_type) {
240 sta = sta_info_get(sdata, bssid);
242 rate_control_rate_update(local, sband, sta,
243 IEEE80211_RC_HT_CHANGED,
248 ht_opmode = le16_to_cpu(hti->operation_mode);
250 /* if bss configuration changed store the new one */
251 if (sdata->ht_opmode_valid != enable_ht ||
252 sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
253 prev_chantype != channel_type) {
254 changed |= BSS_CHANGED_HT;
255 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
256 sdata->ht_opmode_valid = enable_ht;
262 /* frame sending functions */
264 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
265 const u8 *bssid, u16 stype, u16 reason,
266 void *cookie, bool send_frame)
268 struct ieee80211_local *local = sdata->local;
269 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
271 struct ieee80211_mgmt *mgmt;
273 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
275 printk(KERN_DEBUG "%s: failed to allocate buffer for "
276 "deauth/disassoc frame\n", sdata->name);
279 skb_reserve(skb, local->hw.extra_tx_headroom);
281 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
283 memcpy(mgmt->da, bssid, ETH_ALEN);
284 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
285 memcpy(mgmt->bssid, bssid, ETH_ALEN);
286 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
288 /* u.deauth.reason_code == u.disassoc.reason_code */
289 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
291 if (stype == IEEE80211_STYPE_DEAUTH)
293 __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
295 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
298 __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
300 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
301 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
302 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
305 ieee80211_tx_skb(sdata, skb);
310 void ieee80211_send_pspoll(struct ieee80211_local *local,
311 struct ieee80211_sub_if_data *sdata)
313 struct ieee80211_pspoll *pspoll;
316 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
320 pspoll = (struct ieee80211_pspoll *) skb->data;
321 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
323 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
324 ieee80211_tx_skb(sdata, skb);
327 void ieee80211_send_nullfunc(struct ieee80211_local *local,
328 struct ieee80211_sub_if_data *sdata,
332 struct ieee80211_hdr_3addr *nullfunc;
334 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
338 nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
340 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
342 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
343 ieee80211_tx_skb(sdata, skb);
346 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
347 struct ieee80211_sub_if_data *sdata)
350 struct ieee80211_hdr *nullfunc;
353 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
356 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
358 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
359 "nullfunc frame\n", sdata->name);
362 skb_reserve(skb, local->hw.extra_tx_headroom);
364 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
365 memset(nullfunc, 0, 30);
366 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
367 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
368 nullfunc->frame_control = fc;
369 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
370 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
371 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
372 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
374 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
375 ieee80211_tx_skb(sdata, skb);
378 /* spectrum management related things */
379 static void ieee80211_chswitch_work(struct work_struct *work)
381 struct ieee80211_sub_if_data *sdata =
382 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
383 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
385 if (!ieee80211_sdata_running(sdata))
388 mutex_lock(&ifmgd->mtx);
389 if (!ifmgd->associated)
392 sdata->local->oper_channel = sdata->local->csa_channel;
393 if (!sdata->local->ops->channel_switch) {
394 /* call "hw_config" only if doing sw channel switch */
395 ieee80211_hw_config(sdata->local,
396 IEEE80211_CONF_CHANGE_CHANNEL);
399 /* XXX: shouldn't really modify cfg80211-owned data! */
400 ifmgd->associated->channel = sdata->local->oper_channel;
402 ieee80211_wake_queues_by_reason(&sdata->local->hw,
403 IEEE80211_QUEUE_STOP_REASON_CSA);
405 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
406 mutex_unlock(&ifmgd->mtx);
409 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
411 struct ieee80211_sub_if_data *sdata;
412 struct ieee80211_if_managed *ifmgd;
414 sdata = vif_to_sdata(vif);
415 ifmgd = &sdata->u.mgd;
417 trace_api_chswitch_done(sdata, success);
420 * If the channel switch was not successful, stay
421 * around on the old channel. We currently lack
422 * good handling of this situation, possibly we
423 * should just drop the association.
425 sdata->local->csa_channel = sdata->local->oper_channel;
428 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
430 EXPORT_SYMBOL(ieee80211_chswitch_done);
432 static void ieee80211_chswitch_timer(unsigned long data)
434 struct ieee80211_sub_if_data *sdata =
435 (struct ieee80211_sub_if_data *) data;
436 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
438 if (sdata->local->quiescing) {
439 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
443 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
446 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
447 struct ieee80211_channel_sw_ie *sw_elem,
448 struct ieee80211_bss *bss,
451 struct cfg80211_bss *cbss =
452 container_of((void *)bss, struct cfg80211_bss, priv);
453 struct ieee80211_channel *new_ch;
454 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
455 int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
456 cbss->channel->band);
458 ASSERT_MGD_MTX(ifmgd);
460 if (!ifmgd->associated)
463 if (sdata->local->scanning)
466 /* Disregard subsequent beacons if we are already running a timer
469 if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
472 new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
473 if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
476 sdata->local->csa_channel = new_ch;
478 if (sdata->local->ops->channel_switch) {
479 /* use driver's channel switch callback */
480 struct ieee80211_channel_switch ch_switch;
481 memset(&ch_switch, 0, sizeof(ch_switch));
482 ch_switch.timestamp = timestamp;
484 ch_switch.block_tx = true;
485 ieee80211_stop_queues_by_reason(&sdata->local->hw,
486 IEEE80211_QUEUE_STOP_REASON_CSA);
488 ch_switch.channel = new_ch;
489 ch_switch.count = sw_elem->count;
490 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
491 drv_channel_switch(sdata->local, &ch_switch);
495 /* channel switch handled in software */
496 if (sw_elem->count <= 1) {
497 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
500 ieee80211_stop_queues_by_reason(&sdata->local->hw,
501 IEEE80211_QUEUE_STOP_REASON_CSA);
502 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
503 mod_timer(&ifmgd->chswitch_timer,
505 msecs_to_jiffies(sw_elem->count *
506 cbss->beacon_interval));
510 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
511 u16 capab_info, u8 *pwr_constr_elem,
512 u8 pwr_constr_elem_len)
514 struct ieee80211_conf *conf = &sdata->local->hw.conf;
516 if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
519 /* Power constraint IE length should be 1 octet */
520 if (pwr_constr_elem_len != 1)
523 if ((*pwr_constr_elem <= conf->channel->max_power) &&
524 (*pwr_constr_elem != sdata->local->power_constr_level)) {
525 sdata->local->power_constr_level = *pwr_constr_elem;
526 ieee80211_hw_config(sdata->local, 0);
530 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
532 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
533 struct ieee80211_local *local = sdata->local;
534 struct ieee80211_conf *conf = &local->hw.conf;
536 WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
537 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
538 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
540 local->disable_dynamic_ps = false;
541 conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
543 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
545 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
547 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
548 struct ieee80211_local *local = sdata->local;
549 struct ieee80211_conf *conf = &local->hw.conf;
551 WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
552 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
553 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
555 local->disable_dynamic_ps = true;
556 conf->dynamic_ps_timeout = 0;
557 del_timer_sync(&local->dynamic_ps_timer);
558 ieee80211_queue_work(&local->hw,
559 &local->dynamic_ps_enable_work);
561 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
564 static void ieee80211_enable_ps(struct ieee80211_local *local,
565 struct ieee80211_sub_if_data *sdata)
567 struct ieee80211_conf *conf = &local->hw.conf;
570 * If we are scanning right now then the parameters will
571 * take effect when scan finishes.
576 if (conf->dynamic_ps_timeout > 0 &&
577 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
578 mod_timer(&local->dynamic_ps_timer, jiffies +
579 msecs_to_jiffies(conf->dynamic_ps_timeout));
581 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
582 ieee80211_send_nullfunc(local, sdata, 1);
584 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
585 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
588 conf->flags |= IEEE80211_CONF_PS;
589 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
593 static void ieee80211_change_ps(struct ieee80211_local *local)
595 struct ieee80211_conf *conf = &local->hw.conf;
597 if (local->ps_sdata) {
598 ieee80211_enable_ps(local, local->ps_sdata);
599 } else if (conf->flags & IEEE80211_CONF_PS) {
600 conf->flags &= ~IEEE80211_CONF_PS;
601 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
602 del_timer_sync(&local->dynamic_ps_timer);
603 cancel_work_sync(&local->dynamic_ps_enable_work);
607 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
609 struct ieee80211_if_managed *mgd = &sdata->u.mgd;
610 struct sta_info *sta = NULL;
616 if (!mgd->associated)
619 if (!mgd->associated->beacon_ies)
622 if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
623 IEEE80211_STA_CONNECTION_POLL))
627 sta = sta_info_get(sdata, mgd->bssid);
629 sta_flags = get_sta_flags(sta);
632 if (!(sta_flags & WLAN_STA_AUTHORIZED))
638 /* need to hold RTNL or interface lock */
639 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
641 struct ieee80211_sub_if_data *sdata, *found = NULL;
645 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
646 local->ps_sdata = NULL;
650 if (!list_empty(&local->work_list)) {
651 local->ps_sdata = NULL;
655 list_for_each_entry(sdata, &local->interfaces, list) {
656 if (!ieee80211_sdata_running(sdata))
658 if (sdata->vif.type == NL80211_IFTYPE_AP) {
659 /* If an AP vif is found, then disable PS
660 * by setting the count to zero thereby setting
666 if (sdata->vif.type != NL80211_IFTYPE_STATION)
672 if (count == 1 && ieee80211_powersave_allowed(found)) {
673 struct ieee80211_conf *conf = &local->hw.conf;
677 latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
679 beaconint_us = ieee80211_tu_to_usec(
680 found->vif.bss_conf.beacon_int);
682 timeout = local->dynamic_ps_forced_timeout;
685 * Go to full PSM if the user configures a very low
686 * latency requirement.
687 * The 2000 second value is there for compatibility
688 * until the PM_QOS_NETWORK_LATENCY is configured
691 if (latency > (1900 * USEC_PER_MSEC) &&
692 latency != (2000 * USEC_PER_SEC))
697 local->dynamic_ps_user_timeout = timeout;
698 if (!local->disable_dynamic_ps)
699 conf->dynamic_ps_timeout =
700 local->dynamic_ps_user_timeout;
702 if (beaconint_us > latency) {
703 local->ps_sdata = NULL;
705 struct ieee80211_bss *bss;
709 bss = (void *)found->u.mgd.associated->priv;
710 dtimper = bss->dtim_period;
712 /* If the TIM IE is invalid, pretend the value is 1 */
715 else if (dtimper > 1)
716 maxslp = min_t(int, dtimper,
717 latency / beaconint_us);
719 local->hw.conf.max_sleep_period = maxslp;
720 local->hw.conf.ps_dtim_period = dtimper;
721 local->ps_sdata = found;
724 local->ps_sdata = NULL;
728 ieee80211_change_ps(local);
731 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
733 struct ieee80211_local *local =
734 container_of(work, struct ieee80211_local,
735 dynamic_ps_disable_work);
737 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
738 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
739 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
742 ieee80211_wake_queues_by_reason(&local->hw,
743 IEEE80211_QUEUE_STOP_REASON_PS);
746 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
748 struct ieee80211_local *local =
749 container_of(work, struct ieee80211_local,
750 dynamic_ps_enable_work);
751 struct ieee80211_sub_if_data *sdata = local->ps_sdata;
752 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
756 /* can only happen when PS was just disabled anyway */
760 if (local->hw.conf.flags & IEEE80211_CONF_PS)
763 if (!local->disable_dynamic_ps &&
764 local->hw.conf.dynamic_ps_timeout > 0) {
765 /* don't enter PS if TX frames are pending */
766 if (drv_tx_frames_pending(local)) {
767 mod_timer(&local->dynamic_ps_timer, jiffies +
769 local->hw.conf.dynamic_ps_timeout));
774 * transmission can be stopped by others which leads to
775 * dynamic_ps_timer expiry. Postpone the ps timer if it
776 * is not the actual idle state.
778 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
779 for (q = 0; q < local->hw.queues; q++) {
780 if (local->queue_stop_reasons[q]) {
781 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
783 mod_timer(&local->dynamic_ps_timer, jiffies +
785 local->hw.conf.dynamic_ps_timeout));
789 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
792 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
793 (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED))) {
794 netif_tx_stop_all_queues(sdata->dev);
796 if (drv_tx_frames_pending(local))
797 mod_timer(&local->dynamic_ps_timer, jiffies +
799 local->hw.conf.dynamic_ps_timeout));
801 ieee80211_send_nullfunc(local, sdata, 1);
802 /* Flush to get the tx status of nullfunc frame */
803 drv_flush(local, false);
807 if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
808 (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
809 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
810 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
811 local->hw.conf.flags |= IEEE80211_CONF_PS;
812 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
815 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
816 netif_tx_wake_all_queues(sdata->dev);
819 void ieee80211_dynamic_ps_timer(unsigned long data)
821 struct ieee80211_local *local = (void *) data;
823 if (local->quiescing || local->suspended)
826 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
830 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
831 struct ieee80211_sub_if_data *sdata,
832 u8 *wmm_param, size_t wmm_param_len)
834 struct ieee80211_tx_queue_params params;
835 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
838 u8 *pos, uapsd_queues = 0;
840 if (!local->ops->conf_tx)
843 if (local->hw.queues < 4)
849 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
852 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
853 uapsd_queues = local->uapsd_queues;
855 count = wmm_param[6] & 0x0f;
856 if (count == ifmgd->wmm_last_param_set)
858 ifmgd->wmm_last_param_set = count;
861 left = wmm_param_len - 8;
863 memset(¶ms, 0, sizeof(params));
866 for (; left >= 4; left -= 4, pos += 4) {
867 int aci = (pos[0] >> 5) & 0x03;
868 int acm = (pos[0] >> 4) & 0x01;
876 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
877 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
883 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
884 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
890 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
891 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
898 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
899 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
904 params.aifs = pos[0] & 0x0f;
905 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
906 params.cw_min = ecw2cw(pos[1] & 0x0f);
907 params.txop = get_unaligned_le16(pos + 2);
908 params.uapsd = uapsd;
910 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
911 wiphy_debug(local->hw.wiphy,
912 "WMM queue=%d aci=%d acm=%d aifs=%d "
913 "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
915 params.aifs, params.cw_min, params.cw_max,
916 params.txop, params.uapsd);
918 if (drv_conf_tx(local, queue, ¶ms))
919 wiphy_debug(local->hw.wiphy,
920 "failed to set TX queue parameters for queue %d\n",
924 /* enable WMM or activate new settings */
925 sdata->vif.bss_conf.qos = true;
926 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
929 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
930 u16 capab, bool erp_valid, u8 erp)
932 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
935 bool use_short_preamble;
939 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
940 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
942 use_protection = false;
943 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
946 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
947 if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
948 use_short_slot = true;
950 if (use_protection != bss_conf->use_cts_prot) {
951 bss_conf->use_cts_prot = use_protection;
952 changed |= BSS_CHANGED_ERP_CTS_PROT;
955 if (use_short_preamble != bss_conf->use_short_preamble) {
956 bss_conf->use_short_preamble = use_short_preamble;
957 changed |= BSS_CHANGED_ERP_PREAMBLE;
960 if (use_short_slot != bss_conf->use_short_slot) {
961 bss_conf->use_short_slot = use_short_slot;
962 changed |= BSS_CHANGED_ERP_SLOT;
968 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
969 struct cfg80211_bss *cbss,
970 u32 bss_info_changed)
972 struct ieee80211_bss *bss = (void *)cbss->priv;
973 struct ieee80211_local *local = sdata->local;
974 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
976 bss_info_changed |= BSS_CHANGED_ASSOC;
977 /* set timing information */
978 bss_conf->beacon_int = cbss->beacon_interval;
979 bss_conf->timestamp = cbss->tsf;
981 bss_info_changed |= BSS_CHANGED_BEACON_INT;
982 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
983 cbss->capability, bss->has_erp_value, bss->erp_value);
985 sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
986 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
988 sdata->u.mgd.associated = cbss;
989 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
991 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
993 /* just to be sure */
994 sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
995 IEEE80211_STA_BEACON_POLL);
997 ieee80211_led_assoc(local, 1);
999 if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
1000 bss_conf->dtim_period = bss->dtim_period;
1002 bss_conf->dtim_period = 0;
1004 bss_conf->assoc = 1;
1006 * For now just always ask the driver to update the basic rateset
1007 * when we have associated, we aren't checking whether it actually
1010 bss_info_changed |= BSS_CHANGED_BASIC_RATES;
1012 /* And the BSSID changed - we're associated now */
1013 bss_info_changed |= BSS_CHANGED_BSSID;
1015 /* Tell the driver to monitor connection quality (if supported) */
1016 if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
1017 bss_conf->cqm_rssi_thold)
1018 bss_info_changed |= BSS_CHANGED_CQM;
1020 /* Enable ARP filtering */
1021 if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
1022 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
1023 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1026 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1028 mutex_lock(&local->iflist_mtx);
1029 ieee80211_recalc_ps(local, -1);
1030 ieee80211_recalc_smps(local);
1031 mutex_unlock(&local->iflist_mtx);
1033 netif_tx_start_all_queues(sdata->dev);
1034 netif_carrier_on(sdata->dev);
1037 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1038 bool remove_sta, bool tx)
1040 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1041 struct ieee80211_local *local = sdata->local;
1042 struct sta_info *sta;
1043 u32 changed = 0, config_changed = 0;
1046 ASSERT_MGD_MTX(ifmgd);
1048 if (WARN_ON(!ifmgd->associated))
1051 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1053 ifmgd->associated = NULL;
1054 memset(ifmgd->bssid, 0, ETH_ALEN);
1057 * we need to commit the associated = NULL change because the
1058 * scan code uses that to determine whether this iface should
1059 * go to/wake up from powersave or not -- and could otherwise
1060 * wake the queues erroneously.
1065 * Thus, we can only afterwards stop the queues -- to account
1066 * for the case where another CPU is finishing a scan at this
1067 * time -- we don't want the scan code to enable queues.
1070 netif_tx_stop_all_queues(sdata->dev);
1071 netif_carrier_off(sdata->dev);
1073 mutex_lock(&local->sta_mtx);
1074 sta = sta_info_get(sdata, bssid);
1076 set_sta_flags(sta, WLAN_STA_BLOCK_BA);
1077 ieee80211_sta_tear_down_BA_sessions(sta, tx);
1079 mutex_unlock(&local->sta_mtx);
1081 changed |= ieee80211_reset_erp_info(sdata);
1083 ieee80211_led_assoc(local, 0);
1084 changed |= BSS_CHANGED_ASSOC;
1085 sdata->vif.bss_conf.assoc = false;
1087 ieee80211_set_wmm_default(sdata);
1089 /* channel(_type) changes are handled by ieee80211_hw_config */
1090 WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
1092 /* on the next assoc, re-program HT parameters */
1093 sdata->ht_opmode_valid = false;
1095 local->power_constr_level = 0;
1097 del_timer_sync(&local->dynamic_ps_timer);
1098 cancel_work_sync(&local->dynamic_ps_enable_work);
1100 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1101 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1102 config_changed |= IEEE80211_CONF_CHANGE_PS;
1104 local->ps_sdata = NULL;
1106 ieee80211_hw_config(local, config_changed);
1108 /* Disable ARP filtering */
1109 if (sdata->vif.bss_conf.arp_filter_enabled) {
1110 sdata->vif.bss_conf.arp_filter_enabled = false;
1111 changed |= BSS_CHANGED_ARP_FILTER;
1114 /* The BSSID (not really interesting) and HT changed */
1115 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1116 ieee80211_bss_info_change_notify(sdata, changed);
1119 sta_info_destroy_addr(sdata, bssid);
1121 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1122 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1123 del_timer_sync(&sdata->u.mgd.timer);
1124 del_timer_sync(&sdata->u.mgd.chswitch_timer);
1127 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1128 struct ieee80211_hdr *hdr)
1131 * We can postpone the mgd.timer whenever receiving unicast frames
1132 * from AP because we know that the connection is working both ways
1133 * at that time. But multicast frames (and hence also beacons) must
1134 * be ignored here, because we need to trigger the timer during
1135 * data idle periods for sending the periodic probe request to the
1136 * AP we're connected to.
1138 if (is_multicast_ether_addr(hdr->addr1))
1141 ieee80211_sta_reset_conn_monitor(sdata);
1144 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1146 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1148 if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1149 IEEE80211_STA_CONNECTION_POLL)))
1152 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1153 IEEE80211_STA_BEACON_POLL);
1154 mutex_lock(&sdata->local->iflist_mtx);
1155 ieee80211_recalc_ps(sdata->local, -1);
1156 mutex_unlock(&sdata->local->iflist_mtx);
1158 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1162 * We've received a probe response, but are not sure whether
1163 * we have or will be receiving any beacons or data, so let's
1164 * schedule the timers again, just in case.
1166 ieee80211_sta_reset_beacon_monitor(sdata);
1168 mod_timer(&ifmgd->conn_mon_timer,
1169 round_jiffies_up(jiffies +
1170 IEEE80211_CONNECTION_IDLE_TIME));
1173 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1174 struct ieee80211_hdr *hdr, bool ack)
1176 if (!ieee80211_is_data(hdr->frame_control))
1180 ieee80211_sta_reset_conn_monitor(sdata);
1182 if (ieee80211_is_nullfunc(hdr->frame_control) &&
1183 sdata->u.mgd.probe_send_count > 0) {
1185 sdata->u.mgd.probe_send_count = 0;
1187 sdata->u.mgd.nullfunc_failed = true;
1188 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1192 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1194 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1196 u8 *dst = ifmgd->associated->bssid;
1197 u8 unicast_limit = max(1, max_probe_tries - 3);
1200 * Try sending broadcast probe requests for the last three
1201 * probe requests after the first ones failed since some
1202 * buggy APs only support broadcast probe requests.
1204 if (ifmgd->probe_send_count >= unicast_limit)
1208 * When the hardware reports an accurate Tx ACK status, it's
1209 * better to send a nullfunc frame instead of a probe request,
1210 * as it will kick us off the AP quickly if we aren't associated
1211 * anymore. The timeout will be reset if the frame is ACKed by
1214 if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1215 ifmgd->nullfunc_failed = false;
1216 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1218 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1219 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid[1], NULL, 0,
1223 ifmgd->probe_send_count++;
1224 ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1225 run_again(ifmgd, ifmgd->probe_timeout);
1228 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1231 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1232 bool already = false;
1234 if (!ieee80211_sdata_running(sdata))
1237 if (sdata->local->scanning)
1240 if (sdata->local->tmp_channel)
1243 mutex_lock(&ifmgd->mtx);
1245 if (!ifmgd->associated)
1248 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1249 if (beacon && net_ratelimit())
1250 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1251 "- sending probe request\n", sdata->name);
1255 * The driver/our work has already reported this event or the
1256 * connection monitoring has kicked in and we have already sent
1257 * a probe request. Or maybe the AP died and the driver keeps
1258 * reporting until we disassociate...
1260 * In either case we have to ignore the current call to this
1261 * function (except for setting the correct probe reason bit)
1262 * because otherwise we would reset the timer every time and
1263 * never check whether we received a probe response!
1265 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1266 IEEE80211_STA_CONNECTION_POLL))
1270 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1272 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1277 mutex_lock(&sdata->local->iflist_mtx);
1278 ieee80211_recalc_ps(sdata->local, -1);
1279 mutex_unlock(&sdata->local->iflist_mtx);
1281 ifmgd->probe_send_count = 0;
1282 ieee80211_mgd_probe_ap_send(sdata);
1284 mutex_unlock(&ifmgd->mtx);
1287 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1288 struct ieee80211_vif *vif)
1290 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1291 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1292 struct sk_buff *skb;
1295 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1298 ASSERT_MGD_MTX(ifmgd);
1300 if (!ifmgd->associated)
1303 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1304 skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid,
1305 ssid + 2, ssid[1], NULL, 0, true);
1309 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1311 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1313 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1314 struct ieee80211_local *local = sdata->local;
1317 mutex_lock(&ifmgd->mtx);
1318 if (!ifmgd->associated) {
1319 mutex_unlock(&ifmgd->mtx);
1323 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1325 printk(KERN_DEBUG "%s: Connection to AP %pM lost.\n",
1326 sdata->name, bssid);
1328 ieee80211_set_disassoc(sdata, true, true);
1329 mutex_unlock(&ifmgd->mtx);
1331 mutex_lock(&local->mtx);
1332 ieee80211_recalc_idle(local);
1333 mutex_unlock(&local->mtx);
1335 * must be outside lock due to cfg80211,
1336 * but that's not a problem.
1338 ieee80211_send_deauth_disassoc(sdata, bssid,
1339 IEEE80211_STYPE_DEAUTH,
1340 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1344 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1346 struct ieee80211_sub_if_data *sdata =
1347 container_of(work, struct ieee80211_sub_if_data,
1348 u.mgd.beacon_connection_loss_work);
1350 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1351 __ieee80211_connection_loss(sdata);
1353 ieee80211_mgd_probe_ap(sdata, true);
1356 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1358 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1359 struct ieee80211_hw *hw = &sdata->local->hw;
1361 trace_api_beacon_loss(sdata);
1363 WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1364 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1366 EXPORT_SYMBOL(ieee80211_beacon_loss);
1368 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1370 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1371 struct ieee80211_hw *hw = &sdata->local->hw;
1373 trace_api_connection_loss(sdata);
1375 WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1376 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1378 EXPORT_SYMBOL(ieee80211_connection_loss);
1381 static enum rx_mgmt_action __must_check
1382 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1383 struct ieee80211_mgmt *mgmt, size_t len)
1385 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1386 const u8 *bssid = NULL;
1390 return RX_MGMT_NONE;
1392 ASSERT_MGD_MTX(ifmgd);
1394 bssid = ifmgd->associated->bssid;
1396 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1398 printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1399 sdata->name, bssid, reason_code);
1401 ieee80211_set_disassoc(sdata, true, false);
1402 mutex_lock(&sdata->local->mtx);
1403 ieee80211_recalc_idle(sdata->local);
1404 mutex_unlock(&sdata->local->mtx);
1406 return RX_MGMT_CFG80211_DEAUTH;
1410 static enum rx_mgmt_action __must_check
1411 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1412 struct ieee80211_mgmt *mgmt, size_t len)
1414 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1418 return RX_MGMT_NONE;
1420 ASSERT_MGD_MTX(ifmgd);
1422 if (WARN_ON(!ifmgd->associated))
1423 return RX_MGMT_NONE;
1425 if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1426 return RX_MGMT_NONE;
1428 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1430 printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1431 sdata->name, mgmt->sa, reason_code);
1433 ieee80211_set_disassoc(sdata, true, false);
1434 mutex_lock(&sdata->local->mtx);
1435 ieee80211_recalc_idle(sdata->local);
1436 mutex_unlock(&sdata->local->mtx);
1437 return RX_MGMT_CFG80211_DISASSOC;
1441 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1442 struct ieee80211_mgmt *mgmt, size_t len)
1444 struct ieee80211_sub_if_data *sdata = wk->sdata;
1445 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1446 struct ieee80211_local *local = sdata->local;
1447 struct ieee80211_supported_band *sband;
1448 struct sta_info *sta;
1449 struct cfg80211_bss *cbss = wk->assoc.bss;
1451 u32 rates, basic_rates;
1452 u16 capab_info, aid;
1453 struct ieee802_11_elems elems;
1454 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1457 bool have_higher_than_11mbit = false;
1458 u16 ap_ht_cap_flags;
1460 /* AssocResp and ReassocResp have identical structure */
1462 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1463 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1465 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1466 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1467 "set\n", sdata->name, aid);
1468 aid &= ~(BIT(15) | BIT(14));
1470 pos = mgmt->u.assoc_resp.variable;
1471 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1473 if (!elems.supp_rates) {
1474 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1481 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1483 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1484 " the AP\n", sdata->name);
1488 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1490 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1491 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1495 sband = local->hw.wiphy->bands[wk->chan->band];
1497 for (i = 0; i < elems.supp_rates_len; i++) {
1498 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1499 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1502 have_higher_than_11mbit = true;
1504 for (j = 0; j < sband->n_bitrates; j++) {
1505 if (sband->bitrates[j].bitrate == rate) {
1508 basic_rates |= BIT(j);
1514 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1515 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1516 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1519 have_higher_than_11mbit = true;
1521 for (j = 0; j < sband->n_bitrates; j++) {
1522 if (sband->bitrates[j].bitrate == rate) {
1525 basic_rates |= BIT(j);
1531 sta->sta.supp_rates[wk->chan->band] = rates;
1532 sdata->vif.bss_conf.basic_rates = basic_rates;
1534 /* cf. IEEE 802.11 9.2.12 */
1535 if (wk->chan->band == IEEE80211_BAND_2GHZ &&
1536 have_higher_than_11mbit)
1537 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1539 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1541 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1542 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1543 elems.ht_cap_elem, &sta->sta.ht_cap);
1545 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1547 rate_control_rate_init(sta);
1549 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1550 set_sta_flags(sta, WLAN_STA_MFP);
1552 if (elems.wmm_param)
1553 set_sta_flags(sta, WLAN_STA_WME);
1555 err = sta_info_insert(sta);
1558 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1559 " the AP (error %d)\n", sdata->name, err);
1564 * Always handle WMM once after association regardless
1565 * of the first value the AP uses. Setting -1 here has
1566 * that effect because the AP values is an unsigned
1569 ifmgd->wmm_last_param_set = -1;
1571 if (elems.wmm_param)
1572 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1573 elems.wmm_param_len);
1575 ieee80211_set_wmm_default(sdata);
1577 local->oper_channel = wk->chan;
1579 if (elems.ht_info_elem && elems.wmm_param &&
1580 (sdata->local->hw.queues >= 4) &&
1581 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1582 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1583 cbss->bssid, ap_ht_cap_flags);
1585 /* set AID and assoc capability,
1586 * ieee80211_set_associated() will tell the driver */
1587 bss_conf->aid = aid;
1588 bss_conf->assoc_capability = capab_info;
1589 ieee80211_set_associated(sdata, cbss, changed);
1592 * If we're using 4-addr mode, let the AP know that we're
1593 * doing so, so that it can create the STA VLAN on its side
1595 if (ifmgd->use_4addr)
1596 ieee80211_send_4addr_nullfunc(local, sdata);
1599 * Start timer to probe the connection to the AP now.
1600 * Also start the timer that will detect beacon loss.
1602 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1603 ieee80211_sta_reset_beacon_monitor(sdata);
1609 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1610 struct ieee80211_mgmt *mgmt,
1612 struct ieee80211_rx_status *rx_status,
1613 struct ieee802_11_elems *elems,
1616 struct ieee80211_local *local = sdata->local;
1618 struct ieee80211_bss *bss;
1619 struct ieee80211_channel *channel;
1620 bool need_ps = false;
1622 if (sdata->u.mgd.associated) {
1623 bss = (void *)sdata->u.mgd.associated->priv;
1624 /* not previously set so we may need to recalc */
1625 need_ps = !bss->dtim_period;
1628 if (elems->ds_params && elems->ds_params_len == 1)
1629 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
1632 freq = rx_status->freq;
1634 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1636 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1639 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1642 ieee80211_rx_bss_put(local, bss);
1644 if (!sdata->u.mgd.associated)
1648 mutex_lock(&local->iflist_mtx);
1649 ieee80211_recalc_ps(local, -1);
1650 mutex_unlock(&local->iflist_mtx);
1653 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1654 (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1656 struct ieee80211_channel_sw_ie *sw_elem =
1657 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1658 ieee80211_sta_process_chanswitch(sdata, sw_elem,
1659 bss, rx_status->mactime);
1664 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1665 struct sk_buff *skb)
1667 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1668 struct ieee80211_if_managed *ifmgd;
1669 struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1670 size_t baselen, len = skb->len;
1671 struct ieee802_11_elems elems;
1673 ifmgd = &sdata->u.mgd;
1675 ASSERT_MGD_MTX(ifmgd);
1677 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1678 return; /* ignore ProbeResp to foreign address */
1680 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1684 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1687 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1689 if (ifmgd->associated &&
1690 memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0)
1691 ieee80211_reset_ap_probe(sdata);
1695 * This is the canonical list of information elements we care about,
1696 * the filter code also gives us all changes to the Microsoft OUI
1697 * (00:50:F2) vendor IE which is used for WMM which we need to track.
1699 * We implement beacon filtering in software since that means we can
1700 * avoid processing the frame here and in cfg80211, and userspace
1701 * will not be able to tell whether the hardware supports it or not.
1703 * XXX: This list needs to be dynamic -- userspace needs to be able to
1704 * add items it requires. It also needs to be able to tell us to
1705 * look out for other vendor IEs.
1707 static const u64 care_about_ies =
1708 (1ULL << WLAN_EID_COUNTRY) |
1709 (1ULL << WLAN_EID_ERP_INFO) |
1710 (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1711 (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1712 (1ULL << WLAN_EID_HT_CAPABILITY) |
1713 (1ULL << WLAN_EID_HT_INFORMATION);
1715 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1716 struct ieee80211_mgmt *mgmt,
1718 struct ieee80211_rx_status *rx_status)
1720 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1721 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1723 struct ieee802_11_elems elems;
1724 struct ieee80211_local *local = sdata->local;
1726 bool erp_valid, directed_tim = false;
1731 ASSERT_MGD_MTX(ifmgd);
1733 /* Process beacon from the current BSS */
1734 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1738 if (rx_status->freq != local->hw.conf.channel->center_freq)
1742 * We might have received a number of frames, among them a
1743 * disassoc frame and a beacon...
1745 if (!ifmgd->associated)
1748 bssid = ifmgd->associated->bssid;
1751 * And in theory even frames from a different AP we were just
1752 * associated to a split-second ago!
1754 if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1757 /* Track average RSSI from the Beacon frames of the current AP */
1758 ifmgd->last_beacon_signal = rx_status->signal;
1759 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1760 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1761 ifmgd->ave_beacon_signal = rx_status->signal * 16;
1762 ifmgd->last_cqm_event_signal = 0;
1763 ifmgd->count_beacon_signal = 1;
1765 ifmgd->ave_beacon_signal =
1766 (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1767 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1768 ifmgd->ave_beacon_signal) / 16;
1769 ifmgd->count_beacon_signal++;
1771 if (bss_conf->cqm_rssi_thold &&
1772 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
1773 !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1774 int sig = ifmgd->ave_beacon_signal / 16;
1775 int last_event = ifmgd->last_cqm_event_signal;
1776 int thold = bss_conf->cqm_rssi_thold;
1777 int hyst = bss_conf->cqm_rssi_hyst;
1779 (last_event == 0 || sig < last_event - hyst)) {
1780 ifmgd->last_cqm_event_signal = sig;
1781 ieee80211_cqm_rssi_notify(
1783 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1785 } else if (sig > thold &&
1786 (last_event == 0 || sig > last_event + hyst)) {
1787 ifmgd->last_cqm_event_signal = sig;
1788 ieee80211_cqm_rssi_notify(
1790 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1795 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1796 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1797 if (net_ratelimit()) {
1798 printk(KERN_DEBUG "%s: cancelling probereq poll due "
1799 "to a received beacon\n", sdata->name);
1802 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1803 mutex_lock(&local->iflist_mtx);
1804 ieee80211_recalc_ps(local, -1);
1805 mutex_unlock(&local->iflist_mtx);
1809 * Push the beacon loss detection into the future since
1810 * we are processing a beacon from the AP just now.
1812 ieee80211_sta_reset_beacon_monitor(sdata);
1814 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1815 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1816 len - baselen, &elems,
1817 care_about_ies, ncrc);
1819 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1820 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1823 if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) {
1824 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1827 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1828 elems.wmm_param_len);
1831 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1833 if (local->hw.conf.dynamic_ps_timeout > 0) {
1834 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1835 ieee80211_hw_config(local,
1836 IEEE80211_CONF_CHANGE_PS);
1837 ieee80211_send_nullfunc(local, sdata, 0);
1839 local->pspolling = true;
1842 * Here is assumed that the driver will be
1843 * able to send ps-poll frame and receive a
1844 * response even though power save mode is
1845 * enabled, but some drivers might require
1846 * to disable power save here. This needs
1847 * to be investigated.
1849 ieee80211_send_pspoll(local, sdata);
1854 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
1856 ifmgd->beacon_crc = ncrc;
1857 ifmgd->beacon_crc_valid = true;
1859 if (elems.erp_info && elems.erp_info_len >= 1) {
1861 erp_value = elems.erp_info[0];
1865 changed |= ieee80211_handle_bss_capability(sdata,
1866 le16_to_cpu(mgmt->u.beacon.capab_info),
1867 erp_valid, erp_value);
1870 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1871 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1872 struct sta_info *sta;
1873 struct ieee80211_supported_band *sband;
1874 u16 ap_ht_cap_flags;
1878 sta = sta_info_get(sdata, bssid);
1879 if (WARN_ON(!sta)) {
1884 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1886 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1887 elems.ht_cap_elem, &sta->sta.ht_cap);
1889 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1893 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1894 bssid, ap_ht_cap_flags);
1897 /* Note: country IE parsing is done for us by cfg80211 */
1898 if (elems.country_elem) {
1899 /* TODO: IBSS also needs this */
1900 if (elems.pwr_constr_elem)
1901 ieee80211_handle_pwr_constr(sdata,
1902 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1903 elems.pwr_constr_elem,
1904 elems.pwr_constr_elem_len);
1907 ieee80211_bss_info_change_notify(sdata, changed);
1910 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1911 struct sk_buff *skb)
1913 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1914 struct ieee80211_rx_status *rx_status;
1915 struct ieee80211_mgmt *mgmt;
1916 enum rx_mgmt_action rma = RX_MGMT_NONE;
1919 rx_status = (struct ieee80211_rx_status *) skb->cb;
1920 mgmt = (struct ieee80211_mgmt *) skb->data;
1921 fc = le16_to_cpu(mgmt->frame_control);
1923 mutex_lock(&ifmgd->mtx);
1925 if (ifmgd->associated &&
1926 memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1927 switch (fc & IEEE80211_FCTL_STYPE) {
1928 case IEEE80211_STYPE_BEACON:
1929 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1932 case IEEE80211_STYPE_PROBE_RESP:
1933 ieee80211_rx_mgmt_probe_resp(sdata, skb);
1935 case IEEE80211_STYPE_DEAUTH:
1936 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1938 case IEEE80211_STYPE_DISASSOC:
1939 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1941 case IEEE80211_STYPE_ACTION:
1942 switch (mgmt->u.action.category) {
1943 case WLAN_CATEGORY_SPECTRUM_MGMT:
1944 ieee80211_sta_process_chanswitch(sdata,
1945 &mgmt->u.action.u.chan_switch.sw_elem,
1946 (void *)ifmgd->associated->priv,
1947 rx_status->mactime);
1951 mutex_unlock(&ifmgd->mtx);
1957 case RX_MGMT_CFG80211_DEAUTH:
1958 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1960 case RX_MGMT_CFG80211_DISASSOC:
1961 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1964 WARN(1, "unexpected: %d", rma);
1969 mutex_unlock(&ifmgd->mtx);
1971 if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1972 (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) {
1973 struct ieee80211_local *local = sdata->local;
1974 struct ieee80211_work *wk;
1976 mutex_lock(&local->mtx);
1977 list_for_each_entry(wk, &local->work_list, list) {
1978 if (wk->sdata != sdata)
1981 if (wk->type != IEEE80211_WORK_ASSOC &&
1982 wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
1985 if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN))
1987 if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN))
1991 * Printing the message only here means we can't
1992 * spuriously print it, but it also means that it
1993 * won't be printed when the frame comes in before
1994 * we even tried to associate or in similar cases.
1996 * Ultimately, I suspect cfg80211 should print the
2000 "%s: deauthenticated from %pM (Reason: %u)\n",
2001 sdata->name, mgmt->bssid,
2002 le16_to_cpu(mgmt->u.deauth.reason_code));
2004 list_del_rcu(&wk->list);
2008 mutex_unlock(&local->mtx);
2010 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2014 static void ieee80211_sta_timer(unsigned long data)
2016 struct ieee80211_sub_if_data *sdata =
2017 (struct ieee80211_sub_if_data *) data;
2018 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2019 struct ieee80211_local *local = sdata->local;
2021 if (local->quiescing) {
2022 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2026 ieee80211_queue_work(&local->hw, &sdata->work);
2029 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2032 struct ieee80211_local *local = sdata->local;
2033 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2035 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
2036 IEEE80211_STA_BEACON_POLL);
2038 ieee80211_set_disassoc(sdata, true, true);
2039 mutex_unlock(&ifmgd->mtx);
2040 mutex_lock(&local->mtx);
2041 ieee80211_recalc_idle(local);
2042 mutex_unlock(&local->mtx);
2044 * must be outside lock due to cfg80211,
2045 * but that's not a problem.
2047 ieee80211_send_deauth_disassoc(sdata, bssid,
2048 IEEE80211_STYPE_DEAUTH,
2049 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2051 mutex_lock(&ifmgd->mtx);
2054 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2056 struct ieee80211_local *local = sdata->local;
2057 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2059 /* then process the rest of the work */
2060 mutex_lock(&ifmgd->mtx);
2062 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2063 IEEE80211_STA_CONNECTION_POLL) &&
2064 ifmgd->associated) {
2068 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2070 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2071 max_tries = max_nullfunc_tries;
2073 max_tries = max_probe_tries;
2075 /* ACK received for nullfunc probing frame */
2076 if (!ifmgd->probe_send_count)
2077 ieee80211_reset_ap_probe(sdata);
2078 else if (ifmgd->nullfunc_failed) {
2079 if (ifmgd->probe_send_count < max_tries) {
2080 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2081 wiphy_debug(local->hw.wiphy,
2082 "%s: No ack for nullfunc frame to"
2083 " AP %pM, try %d/%i\n",
2085 ifmgd->probe_send_count, max_tries);
2087 ieee80211_mgd_probe_ap_send(sdata);
2089 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2090 wiphy_debug(local->hw.wiphy,
2091 "%s: No ack for nullfunc frame to"
2092 " AP %pM, disconnecting.\n",
2093 sdata->name, bssid);
2095 ieee80211_sta_connection_lost(sdata, bssid);
2097 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
2098 run_again(ifmgd, ifmgd->probe_timeout);
2099 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2100 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2101 wiphy_debug(local->hw.wiphy,
2102 "%s: Failed to send nullfunc to AP %pM"
2103 " after %dms, disconnecting.\n",
2105 bssid, probe_wait_ms);
2107 ieee80211_sta_connection_lost(sdata, bssid);
2108 } else if (ifmgd->probe_send_count < max_tries) {
2109 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2110 wiphy_debug(local->hw.wiphy,
2111 "%s: No probe response from AP %pM"
2112 " after %dms, try %d/%i\n",
2114 bssid, probe_wait_ms,
2115 ifmgd->probe_send_count, max_tries);
2117 ieee80211_mgd_probe_ap_send(sdata);
2120 * We actually lost the connection ... or did we?
2123 wiphy_debug(local->hw.wiphy,
2124 "%s: No probe response from AP %pM"
2125 " after %dms, disconnecting.\n",
2127 bssid, probe_wait_ms);
2129 ieee80211_sta_connection_lost(sdata, bssid);
2133 mutex_unlock(&ifmgd->mtx);
2136 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2138 struct ieee80211_sub_if_data *sdata =
2139 (struct ieee80211_sub_if_data *) data;
2140 struct ieee80211_local *local = sdata->local;
2142 if (local->quiescing)
2145 ieee80211_queue_work(&sdata->local->hw,
2146 &sdata->u.mgd.beacon_connection_loss_work);
2149 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2151 struct ieee80211_sub_if_data *sdata =
2152 (struct ieee80211_sub_if_data *) data;
2153 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2154 struct ieee80211_local *local = sdata->local;
2156 if (local->quiescing)
2159 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2162 static void ieee80211_sta_monitor_work(struct work_struct *work)
2164 struct ieee80211_sub_if_data *sdata =
2165 container_of(work, struct ieee80211_sub_if_data,
2166 u.mgd.monitor_work);
2168 ieee80211_mgd_probe_ap(sdata, false);
2171 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2173 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2174 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
2175 IEEE80211_STA_CONNECTION_POLL);
2177 /* let's probe the connection once */
2178 ieee80211_queue_work(&sdata->local->hw,
2179 &sdata->u.mgd.monitor_work);
2180 /* and do all the other regular work too */
2181 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2186 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2188 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2191 * we need to use atomic bitops for the running bits
2192 * only because both timers might fire at the same
2193 * time -- the code here is properly synchronised.
2196 cancel_work_sync(&ifmgd->request_smps_work);
2198 cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2199 if (del_timer_sync(&ifmgd->timer))
2200 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2202 cancel_work_sync(&ifmgd->chswitch_work);
2203 if (del_timer_sync(&ifmgd->chswitch_timer))
2204 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2206 cancel_work_sync(&ifmgd->monitor_work);
2207 /* these will just be re-established on connection */
2208 del_timer_sync(&ifmgd->conn_mon_timer);
2209 del_timer_sync(&ifmgd->bcn_mon_timer);
2212 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2214 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2216 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2217 add_timer(&ifmgd->timer);
2218 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2219 add_timer(&ifmgd->chswitch_timer);
2220 ieee80211_sta_reset_beacon_monitor(sdata);
2221 ieee80211_restart_sta_timer(sdata);
2222 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.monitor_work);
2226 /* interface setup */
2227 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2229 struct ieee80211_if_managed *ifmgd;
2231 ifmgd = &sdata->u.mgd;
2232 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2233 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2234 INIT_WORK(&ifmgd->beacon_connection_loss_work,
2235 ieee80211_beacon_connection_loss_work);
2236 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
2237 setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2238 (unsigned long) sdata);
2239 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2240 (unsigned long) sdata);
2241 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2242 (unsigned long) sdata);
2243 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2244 (unsigned long) sdata);
2248 mutex_init(&ifmgd->mtx);
2250 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
2251 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
2253 ifmgd->req_smps = IEEE80211_SMPS_OFF;
2256 /* scan finished notification */
2257 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2259 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2261 /* Restart STA timers */
2263 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2264 ieee80211_restart_sta_timer(sdata);
2268 int ieee80211_max_network_latency(struct notifier_block *nb,
2269 unsigned long data, void *dummy)
2271 s32 latency_usec = (s32) data;
2272 struct ieee80211_local *local =
2273 container_of(nb, struct ieee80211_local,
2274 network_latency_notifier);
2276 mutex_lock(&local->iflist_mtx);
2277 ieee80211_recalc_ps(local, latency_usec);
2278 mutex_unlock(&local->iflist_mtx);
2284 static enum work_done_result
2285 ieee80211_probe_auth_done(struct ieee80211_work *wk,
2286 struct sk_buff *skb)
2289 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
2290 return WORK_DONE_DESTROY;
2293 if (wk->type == IEEE80211_WORK_AUTH) {
2294 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
2295 return WORK_DONE_DESTROY;
2298 mutex_lock(&wk->sdata->u.mgd.mtx);
2299 ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
2300 mutex_unlock(&wk->sdata->u.mgd.mtx);
2302 wk->type = IEEE80211_WORK_AUTH;
2303 wk->probe_auth.tries = 0;
2304 return WORK_DONE_REQUEUE;
2307 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2308 struct cfg80211_auth_request *req)
2311 struct ieee80211_work *wk;
2314 if (req->local_state_change)
2315 return 0; /* no need to update mac80211 state */
2317 switch (req->auth_type) {
2318 case NL80211_AUTHTYPE_OPEN_SYSTEM:
2319 auth_alg = WLAN_AUTH_OPEN;
2321 case NL80211_AUTHTYPE_SHARED_KEY:
2322 if (IS_ERR(sdata->local->wep_tx_tfm))
2324 auth_alg = WLAN_AUTH_SHARED_KEY;
2326 case NL80211_AUTHTYPE_FT:
2327 auth_alg = WLAN_AUTH_FT;
2329 case NL80211_AUTHTYPE_NETWORK_EAP:
2330 auth_alg = WLAN_AUTH_LEAP;
2336 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2340 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2342 if (req->ie && req->ie_len) {
2343 memcpy(wk->ie, req->ie, req->ie_len);
2344 wk->ie_len = req->ie_len;
2347 if (req->key && req->key_len) {
2348 wk->probe_auth.key_len = req->key_len;
2349 wk->probe_auth.key_idx = req->key_idx;
2350 memcpy(wk->probe_auth.key, req->key, req->key_len);
2353 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2354 memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
2355 wk->probe_auth.ssid_len = ssid[1];
2357 wk->probe_auth.algorithm = auth_alg;
2358 wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
2360 /* if we already have a probe, don't probe again */
2361 if (req->bss->proberesp_ies)
2362 wk->type = IEEE80211_WORK_AUTH;
2364 wk->type = IEEE80211_WORK_DIRECT_PROBE;
2365 wk->chan = req->bss->channel;
2366 wk->chan_type = NL80211_CHAN_NO_HT;
2368 wk->done = ieee80211_probe_auth_done;
2370 ieee80211_add_work(wk);
2374 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
2375 struct sk_buff *skb)
2377 struct ieee80211_mgmt *mgmt;
2378 struct ieee80211_rx_status *rx_status;
2379 struct ieee802_11_elems elems;
2383 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
2384 return WORK_DONE_DESTROY;
2387 if (wk->type == IEEE80211_WORK_ASSOC_BEACON_WAIT) {
2388 mutex_lock(&wk->sdata->u.mgd.mtx);
2389 rx_status = (void *) skb->cb;
2390 ieee802_11_parse_elems(skb->data + 24 + 12, skb->len - 24 - 12, &elems);
2391 ieee80211_rx_bss_info(wk->sdata, (void *)skb->data, skb->len, rx_status,
2393 mutex_unlock(&wk->sdata->u.mgd.mtx);
2395 wk->type = IEEE80211_WORK_ASSOC;
2396 /* not really done yet */
2397 return WORK_DONE_REQUEUE;
2400 mgmt = (void *)skb->data;
2401 status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2403 if (status == WLAN_STATUS_SUCCESS) {
2404 mutex_lock(&wk->sdata->u.mgd.mtx);
2405 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
2406 mutex_unlock(&wk->sdata->u.mgd.mtx);
2407 /* oops -- internal error -- send timeout for now */
2408 cfg80211_send_assoc_timeout(wk->sdata->dev,
2410 return WORK_DONE_DESTROY;
2413 mutex_unlock(&wk->sdata->u.mgd.mtx);
2416 cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2417 return WORK_DONE_DESTROY;
2420 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2421 struct cfg80211_assoc_request *req)
2423 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2424 struct ieee80211_bss *bss = (void *)req->bss->priv;
2425 struct ieee80211_work *wk;
2429 mutex_lock(&ifmgd->mtx);
2430 if (ifmgd->associated) {
2431 if (!req->prev_bssid ||
2432 memcmp(req->prev_bssid, ifmgd->associated->bssid,
2435 * We are already associated and the request was not a
2436 * reassociation request from the current BSS, so
2439 mutex_unlock(&ifmgd->mtx);
2443 /* Trying to reassociate - clear previous association state */
2444 ieee80211_set_disassoc(sdata, true, false);
2446 mutex_unlock(&ifmgd->mtx);
2448 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2452 ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2453 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2455 ifmgd->beacon_crc_valid = false;
2457 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2458 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2459 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2460 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2461 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2464 if (req->ie && req->ie_len) {
2465 memcpy(wk->ie, req->ie, req->ie_len);
2466 wk->ie_len = req->ie_len;
2470 wk->assoc.bss = req->bss;
2472 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2474 /* new association always uses requested smps mode */
2475 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2476 if (ifmgd->powersave)
2477 ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2479 ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2481 ifmgd->ap_smps = ifmgd->req_smps;
2483 wk->assoc.smps = ifmgd->ap_smps;
2485 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2486 * We still associate in non-HT mode (11a/b/g) if any one of these
2487 * ciphers is configured as pairwise.
2488 * We can set this to true for non-11n hardware, that'll be checked
2489 * separately along with the peer capabilities.
2491 wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2492 wk->assoc.capability = req->bss->capability;
2493 wk->assoc.wmm_used = bss->wmm_used;
2494 wk->assoc.supp_rates = bss->supp_rates;
2495 wk->assoc.supp_rates_len = bss->supp_rates_len;
2496 wk->assoc.ht_information_ie =
2497 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2499 if (bss->wmm_used && bss->uapsd_supported &&
2500 (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2501 wk->assoc.uapsd_used = true;
2502 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2504 wk->assoc.uapsd_used = false;
2505 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2508 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2509 memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2510 wk->assoc.ssid_len = ssid[1];
2512 if (req->prev_bssid)
2513 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2515 wk->chan = req->bss->channel;
2516 wk->chan_type = NL80211_CHAN_NO_HT;
2518 wk->done = ieee80211_assoc_done;
2519 if (!bss->dtim_period &&
2520 sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
2521 wk->type = IEEE80211_WORK_ASSOC_BEACON_WAIT;
2523 wk->type = IEEE80211_WORK_ASSOC;
2526 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2527 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2529 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2530 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2533 if (req->crypto.control_port)
2534 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2536 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2538 sdata->control_port_protocol = req->crypto.control_port_ethertype;
2539 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
2541 ieee80211_add_work(wk);
2545 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2546 struct cfg80211_deauth_request *req,
2549 struct ieee80211_local *local = sdata->local;
2550 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2551 struct ieee80211_work *wk;
2553 bool assoc_bss = false;
2555 mutex_lock(&ifmgd->mtx);
2557 memcpy(bssid, req->bss->bssid, ETH_ALEN);
2558 if (ifmgd->associated == req->bss) {
2559 ieee80211_set_disassoc(sdata, false, true);
2560 mutex_unlock(&ifmgd->mtx);
2563 bool not_auth_yet = false;
2565 mutex_unlock(&ifmgd->mtx);
2567 mutex_lock(&local->mtx);
2568 list_for_each_entry(wk, &local->work_list, list) {
2569 if (wk->sdata != sdata)
2572 if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2573 wk->type != IEEE80211_WORK_AUTH &&
2574 wk->type != IEEE80211_WORK_ASSOC &&
2575 wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
2578 if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2581 not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2582 list_del_rcu(&wk->list);
2586 mutex_unlock(&local->mtx);
2589 * If somebody requests authentication and we haven't
2590 * sent out an auth frame yet there's no need to send
2591 * out a deauth frame either. If the state was PROBE,
2592 * then this is the case. If it's AUTH we have sent a
2593 * frame, and if it's IDLE we have completed the auth
2597 __cfg80211_auth_canceled(sdata->dev, bssid);
2602 printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2603 sdata->name, bssid, req->reason_code);
2605 ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2606 req->reason_code, cookie,
2607 !req->local_state_change);
2609 sta_info_destroy_addr(sdata, bssid);
2611 mutex_lock(&sdata->local->mtx);
2612 ieee80211_recalc_idle(sdata->local);
2613 mutex_unlock(&sdata->local->mtx);
2618 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2619 struct cfg80211_disassoc_request *req,
2622 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2625 mutex_lock(&ifmgd->mtx);
2628 * cfg80211 should catch this ... but it's racy since
2629 * we can receive a disassoc frame, process it, hand it
2630 * to cfg80211 while that's in a locked section already
2631 * trying to tell us that the user wants to disconnect.
2633 if (ifmgd->associated != req->bss) {
2634 mutex_unlock(&ifmgd->mtx);
2638 printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2639 sdata->name, req->bss->bssid, req->reason_code);
2641 memcpy(bssid, req->bss->bssid, ETH_ALEN);
2642 ieee80211_set_disassoc(sdata, false, true);
2644 mutex_unlock(&ifmgd->mtx);
2646 ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2647 IEEE80211_STYPE_DISASSOC, req->reason_code,
2648 cookie, !req->local_state_change);
2649 sta_info_destroy_addr(sdata, bssid);
2651 mutex_lock(&sdata->local->mtx);
2652 ieee80211_recalc_idle(sdata->local);
2653 mutex_unlock(&sdata->local->mtx);
2658 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2659 enum nl80211_cqm_rssi_threshold_event rssi_event,
2662 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2664 trace_api_cqm_rssi_notify(sdata, rssi_event);
2666 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2668 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
2670 unsigned char ieee80211_get_operstate(struct ieee80211_vif *vif)
2672 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2673 return sdata->dev->operstate;
2675 EXPORT_SYMBOL(ieee80211_get_operstate);