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)
764 * transmission can be stopped by others which leads to
765 * dynamic_ps_timer expiry. Postpond the ps timer if it
766 * is not the actual idle state.
768 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
769 for (q = 0; q < local->hw.queues; q++) {
770 if (local->queue_stop_reasons[q]) {
771 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
773 mod_timer(&local->dynamic_ps_timer, jiffies +
775 local->hw.conf.dynamic_ps_timeout));
779 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
781 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
782 (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED))) {
783 netif_tx_stop_all_queues(sdata->dev);
785 if (drv_tx_frames_pending(local))
786 mod_timer(&local->dynamic_ps_timer, jiffies +
788 local->hw.conf.dynamic_ps_timeout));
790 ieee80211_send_nullfunc(local, sdata, 1);
791 /* Flush to get the tx status of nullfunc frame */
792 drv_flush(local, false);
796 if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
797 (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
798 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
799 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
800 local->hw.conf.flags |= IEEE80211_CONF_PS;
801 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
804 netif_tx_wake_all_queues(sdata->dev);
807 void ieee80211_dynamic_ps_timer(unsigned long data)
809 struct ieee80211_local *local = (void *) data;
811 if (local->quiescing || local->suspended)
814 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
818 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
819 struct ieee80211_sub_if_data *sdata,
820 u8 *wmm_param, size_t wmm_param_len)
822 struct ieee80211_tx_queue_params params;
823 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
826 u8 *pos, uapsd_queues = 0;
828 if (!local->ops->conf_tx)
831 if (local->hw.queues < 4)
837 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
840 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
841 uapsd_queues = local->uapsd_queues;
843 count = wmm_param[6] & 0x0f;
844 if (count == ifmgd->wmm_last_param_set)
846 ifmgd->wmm_last_param_set = count;
849 left = wmm_param_len - 8;
851 memset(¶ms, 0, sizeof(params));
854 for (; left >= 4; left -= 4, pos += 4) {
855 int aci = (pos[0] >> 5) & 0x03;
856 int acm = (pos[0] >> 4) & 0x01;
864 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
865 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
871 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
872 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
878 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
879 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
886 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
887 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
892 params.aifs = pos[0] & 0x0f;
893 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
894 params.cw_min = ecw2cw(pos[1] & 0x0f);
895 params.txop = get_unaligned_le16(pos + 2);
896 params.uapsd = uapsd;
898 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
899 wiphy_debug(local->hw.wiphy,
900 "WMM queue=%d aci=%d acm=%d aifs=%d "
901 "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
903 params.aifs, params.cw_min, params.cw_max,
904 params.txop, params.uapsd);
906 if (drv_conf_tx(local, queue, ¶ms))
907 wiphy_debug(local->hw.wiphy,
908 "failed to set TX queue parameters for queue %d\n",
912 /* enable WMM or activate new settings */
913 sdata->vif.bss_conf.qos = true;
914 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
917 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
918 u16 capab, bool erp_valid, u8 erp)
920 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
923 bool use_short_preamble;
927 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
928 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
930 use_protection = false;
931 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
934 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
935 if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
936 use_short_slot = true;
938 if (use_protection != bss_conf->use_cts_prot) {
939 bss_conf->use_cts_prot = use_protection;
940 changed |= BSS_CHANGED_ERP_CTS_PROT;
943 if (use_short_preamble != bss_conf->use_short_preamble) {
944 bss_conf->use_short_preamble = use_short_preamble;
945 changed |= BSS_CHANGED_ERP_PREAMBLE;
948 if (use_short_slot != bss_conf->use_short_slot) {
949 bss_conf->use_short_slot = use_short_slot;
950 changed |= BSS_CHANGED_ERP_SLOT;
956 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
957 struct cfg80211_bss *cbss,
958 u32 bss_info_changed)
960 struct ieee80211_bss *bss = (void *)cbss->priv;
961 struct ieee80211_local *local = sdata->local;
962 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
964 bss_info_changed |= BSS_CHANGED_ASSOC;
965 /* set timing information */
966 bss_conf->beacon_int = cbss->beacon_interval;
967 bss_conf->timestamp = cbss->tsf;
969 bss_info_changed |= BSS_CHANGED_BEACON_INT;
970 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
971 cbss->capability, bss->has_erp_value, bss->erp_value);
973 sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
974 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
976 sdata->u.mgd.associated = cbss;
977 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
979 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
981 /* just to be sure */
982 sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
983 IEEE80211_STA_BEACON_POLL);
985 ieee80211_led_assoc(local, 1);
987 if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
988 bss_conf->dtim_period = bss->dtim_period;
990 bss_conf->dtim_period = 0;
994 * For now just always ask the driver to update the basic rateset
995 * when we have associated, we aren't checking whether it actually
998 bss_info_changed |= BSS_CHANGED_BASIC_RATES;
1000 /* And the BSSID changed - we're associated now */
1001 bss_info_changed |= BSS_CHANGED_BSSID;
1003 /* Tell the driver to monitor connection quality (if supported) */
1004 if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
1005 bss_conf->cqm_rssi_thold)
1006 bss_info_changed |= BSS_CHANGED_CQM;
1008 /* Enable ARP filtering */
1009 if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
1010 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
1011 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1014 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1016 mutex_lock(&local->iflist_mtx);
1017 ieee80211_recalc_ps(local, -1);
1018 ieee80211_recalc_smps(local);
1019 mutex_unlock(&local->iflist_mtx);
1021 netif_tx_start_all_queues(sdata->dev);
1022 netif_carrier_on(sdata->dev);
1025 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1026 bool remove_sta, bool tx)
1028 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1029 struct ieee80211_local *local = sdata->local;
1030 struct sta_info *sta;
1031 u32 changed = 0, config_changed = 0;
1034 ASSERT_MGD_MTX(ifmgd);
1036 if (WARN_ON(!ifmgd->associated))
1039 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1041 ifmgd->associated = NULL;
1042 memset(ifmgd->bssid, 0, ETH_ALEN);
1045 * we need to commit the associated = NULL change because the
1046 * scan code uses that to determine whether this iface should
1047 * go to/wake up from powersave or not -- and could otherwise
1048 * wake the queues erroneously.
1053 * Thus, we can only afterwards stop the queues -- to account
1054 * for the case where another CPU is finishing a scan at this
1055 * time -- we don't want the scan code to enable queues.
1058 netif_tx_stop_all_queues(sdata->dev);
1059 netif_carrier_off(sdata->dev);
1061 mutex_lock(&local->sta_mtx);
1062 sta = sta_info_get(sdata, bssid);
1064 set_sta_flags(sta, WLAN_STA_BLOCK_BA);
1065 ieee80211_sta_tear_down_BA_sessions(sta, tx);
1067 mutex_unlock(&local->sta_mtx);
1069 changed |= ieee80211_reset_erp_info(sdata);
1071 ieee80211_led_assoc(local, 0);
1072 changed |= BSS_CHANGED_ASSOC;
1073 sdata->vif.bss_conf.assoc = false;
1075 ieee80211_set_wmm_default(sdata);
1077 /* channel(_type) changes are handled by ieee80211_hw_config */
1078 WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
1080 /* on the next assoc, re-program HT parameters */
1081 sdata->ht_opmode_valid = false;
1083 local->power_constr_level = 0;
1085 del_timer_sync(&local->dynamic_ps_timer);
1086 cancel_work_sync(&local->dynamic_ps_enable_work);
1088 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1089 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1090 config_changed |= IEEE80211_CONF_CHANGE_PS;
1092 local->ps_sdata = NULL;
1094 ieee80211_hw_config(local, config_changed);
1096 /* Disable ARP filtering */
1097 if (sdata->vif.bss_conf.arp_filter_enabled) {
1098 sdata->vif.bss_conf.arp_filter_enabled = false;
1099 changed |= BSS_CHANGED_ARP_FILTER;
1102 /* The BSSID (not really interesting) and HT changed */
1103 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1104 ieee80211_bss_info_change_notify(sdata, changed);
1107 sta_info_destroy_addr(sdata, bssid);
1109 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1110 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1111 del_timer_sync(&sdata->u.mgd.timer);
1112 del_timer_sync(&sdata->u.mgd.chswitch_timer);
1115 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1116 struct ieee80211_hdr *hdr)
1119 * We can postpone the mgd.timer whenever receiving unicast frames
1120 * from AP because we know that the connection is working both ways
1121 * at that time. But multicast frames (and hence also beacons) must
1122 * be ignored here, because we need to trigger the timer during
1123 * data idle periods for sending the periodic probe request to the
1124 * AP we're connected to.
1126 if (is_multicast_ether_addr(hdr->addr1))
1129 ieee80211_sta_reset_conn_monitor(sdata);
1132 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1134 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1136 if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1137 IEEE80211_STA_CONNECTION_POLL)))
1140 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1141 IEEE80211_STA_BEACON_POLL);
1142 mutex_lock(&sdata->local->iflist_mtx);
1143 ieee80211_recalc_ps(sdata->local, -1);
1144 mutex_unlock(&sdata->local->iflist_mtx);
1146 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1150 * We've received a probe response, but are not sure whether
1151 * we have or will be receiving any beacons or data, so let's
1152 * schedule the timers again, just in case.
1154 ieee80211_sta_reset_beacon_monitor(sdata);
1156 mod_timer(&ifmgd->conn_mon_timer,
1157 round_jiffies_up(jiffies +
1158 IEEE80211_CONNECTION_IDLE_TIME));
1161 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1162 struct ieee80211_hdr *hdr, bool ack)
1164 if (!ieee80211_is_data(hdr->frame_control))
1168 ieee80211_sta_reset_conn_monitor(sdata);
1170 if (ieee80211_is_nullfunc(hdr->frame_control) &&
1171 sdata->u.mgd.probe_send_count > 0) {
1173 sdata->u.mgd.probe_send_count = 0;
1175 sdata->u.mgd.nullfunc_failed = true;
1176 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1180 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1182 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1184 u8 *dst = ifmgd->associated->bssid;
1185 u8 unicast_limit = max(1, max_probe_tries - 3);
1188 * Try sending broadcast probe requests for the last three
1189 * probe requests after the first ones failed since some
1190 * buggy APs only support broadcast probe requests.
1192 if (ifmgd->probe_send_count >= unicast_limit)
1196 * When the hardware reports an accurate Tx ACK status, it's
1197 * better to send a nullfunc frame instead of a probe request,
1198 * as it will kick us off the AP quickly if we aren't associated
1199 * anymore. The timeout will be reset if the frame is ACKed by
1202 if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1203 ifmgd->nullfunc_failed = false;
1204 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1206 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1207 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid[1], NULL, 0);
1210 ifmgd->probe_send_count++;
1211 ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1212 run_again(ifmgd, ifmgd->probe_timeout);
1215 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1218 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1219 bool already = false;
1221 if (!ieee80211_sdata_running(sdata))
1224 if (sdata->local->scanning)
1227 if (sdata->local->tmp_channel)
1230 mutex_lock(&ifmgd->mtx);
1232 if (!ifmgd->associated)
1235 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1236 if (beacon && net_ratelimit())
1237 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1238 "- sending probe request\n", sdata->name);
1242 * The driver/our work has already reported this event or the
1243 * connection monitoring has kicked in and we have already sent
1244 * a probe request. Or maybe the AP died and the driver keeps
1245 * reporting until we disassociate...
1247 * In either case we have to ignore the current call to this
1248 * function (except for setting the correct probe reason bit)
1249 * because otherwise we would reset the timer every time and
1250 * never check whether we received a probe response!
1252 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1253 IEEE80211_STA_CONNECTION_POLL))
1257 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1259 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1264 mutex_lock(&sdata->local->iflist_mtx);
1265 ieee80211_recalc_ps(sdata->local, -1);
1266 mutex_unlock(&sdata->local->iflist_mtx);
1268 ifmgd->probe_send_count = 0;
1269 ieee80211_mgd_probe_ap_send(sdata);
1271 mutex_unlock(&ifmgd->mtx);
1274 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1275 struct ieee80211_vif *vif)
1277 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1278 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1279 struct sk_buff *skb;
1282 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1285 ASSERT_MGD_MTX(ifmgd);
1287 if (!ifmgd->associated)
1290 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1291 skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid,
1292 ssid + 2, ssid[1], NULL, 0);
1296 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1298 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1300 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1301 struct ieee80211_local *local = sdata->local;
1304 mutex_lock(&ifmgd->mtx);
1305 if (!ifmgd->associated) {
1306 mutex_unlock(&ifmgd->mtx);
1310 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1312 printk(KERN_DEBUG "%s: Connection to AP %pM lost.\n",
1313 sdata->name, bssid);
1315 ieee80211_set_disassoc(sdata, true, true);
1316 mutex_unlock(&ifmgd->mtx);
1318 mutex_lock(&local->mtx);
1319 ieee80211_recalc_idle(local);
1320 mutex_unlock(&local->mtx);
1322 * must be outside lock due to cfg80211,
1323 * but that's not a problem.
1325 ieee80211_send_deauth_disassoc(sdata, bssid,
1326 IEEE80211_STYPE_DEAUTH,
1327 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1331 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1333 struct ieee80211_sub_if_data *sdata =
1334 container_of(work, struct ieee80211_sub_if_data,
1335 u.mgd.beacon_connection_loss_work);
1337 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1338 __ieee80211_connection_loss(sdata);
1340 ieee80211_mgd_probe_ap(sdata, true);
1343 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1345 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1346 struct ieee80211_hw *hw = &sdata->local->hw;
1348 trace_api_beacon_loss(sdata);
1350 WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1351 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1353 EXPORT_SYMBOL(ieee80211_beacon_loss);
1355 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1357 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1358 struct ieee80211_hw *hw = &sdata->local->hw;
1360 trace_api_connection_loss(sdata);
1362 WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1363 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1365 EXPORT_SYMBOL(ieee80211_connection_loss);
1368 static enum rx_mgmt_action __must_check
1369 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1370 struct ieee80211_mgmt *mgmt, size_t len)
1372 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1373 const u8 *bssid = NULL;
1377 return RX_MGMT_NONE;
1379 ASSERT_MGD_MTX(ifmgd);
1381 bssid = ifmgd->associated->bssid;
1383 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1385 printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1386 sdata->name, bssid, reason_code);
1388 ieee80211_set_disassoc(sdata, true, false);
1389 mutex_lock(&sdata->local->mtx);
1390 ieee80211_recalc_idle(sdata->local);
1391 mutex_unlock(&sdata->local->mtx);
1393 return RX_MGMT_CFG80211_DEAUTH;
1397 static enum rx_mgmt_action __must_check
1398 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1399 struct ieee80211_mgmt *mgmt, size_t len)
1401 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1405 return RX_MGMT_NONE;
1407 ASSERT_MGD_MTX(ifmgd);
1409 if (WARN_ON(!ifmgd->associated))
1410 return RX_MGMT_NONE;
1412 if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1413 return RX_MGMT_NONE;
1415 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1417 printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1418 sdata->name, mgmt->sa, reason_code);
1420 ieee80211_set_disassoc(sdata, true, false);
1421 mutex_lock(&sdata->local->mtx);
1422 ieee80211_recalc_idle(sdata->local);
1423 mutex_unlock(&sdata->local->mtx);
1424 return RX_MGMT_CFG80211_DISASSOC;
1428 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1429 struct ieee80211_mgmt *mgmt, size_t len)
1431 struct ieee80211_sub_if_data *sdata = wk->sdata;
1432 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1433 struct ieee80211_local *local = sdata->local;
1434 struct ieee80211_supported_band *sband;
1435 struct sta_info *sta;
1436 struct cfg80211_bss *cbss = wk->assoc.bss;
1438 u32 rates, basic_rates;
1439 u16 capab_info, aid;
1440 struct ieee802_11_elems elems;
1441 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1444 bool have_higher_than_11mbit = false;
1445 u16 ap_ht_cap_flags;
1447 /* AssocResp and ReassocResp have identical structure */
1449 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1450 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1452 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1453 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1454 "set\n", sdata->name, aid);
1455 aid &= ~(BIT(15) | BIT(14));
1457 pos = mgmt->u.assoc_resp.variable;
1458 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1460 if (!elems.supp_rates) {
1461 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1468 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1470 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1471 " the AP\n", sdata->name);
1475 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1477 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1478 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1482 sband = local->hw.wiphy->bands[wk->chan->band];
1484 for (i = 0; i < elems.supp_rates_len; i++) {
1485 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1486 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1489 have_higher_than_11mbit = true;
1491 for (j = 0; j < sband->n_bitrates; j++) {
1492 if (sband->bitrates[j].bitrate == rate) {
1495 basic_rates |= BIT(j);
1501 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1502 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1503 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1506 have_higher_than_11mbit = true;
1508 for (j = 0; j < sband->n_bitrates; j++) {
1509 if (sband->bitrates[j].bitrate == rate) {
1512 basic_rates |= BIT(j);
1518 sta->sta.supp_rates[wk->chan->band] = rates;
1519 sdata->vif.bss_conf.basic_rates = basic_rates;
1521 /* cf. IEEE 802.11 9.2.12 */
1522 if (wk->chan->band == IEEE80211_BAND_2GHZ &&
1523 have_higher_than_11mbit)
1524 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1526 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1528 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1529 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1530 elems.ht_cap_elem, &sta->sta.ht_cap);
1532 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1534 rate_control_rate_init(sta);
1536 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1537 set_sta_flags(sta, WLAN_STA_MFP);
1539 if (elems.wmm_param)
1540 set_sta_flags(sta, WLAN_STA_WME);
1542 err = sta_info_insert(sta);
1545 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1546 " the AP (error %d)\n", sdata->name, err);
1551 * Always handle WMM once after association regardless
1552 * of the first value the AP uses. Setting -1 here has
1553 * that effect because the AP values is an unsigned
1556 ifmgd->wmm_last_param_set = -1;
1558 if (elems.wmm_param)
1559 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1560 elems.wmm_param_len);
1562 ieee80211_set_wmm_default(sdata);
1564 local->oper_channel = wk->chan;
1566 if (elems.ht_info_elem && elems.wmm_param &&
1567 (sdata->local->hw.queues >= 4) &&
1568 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1569 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1570 cbss->bssid, ap_ht_cap_flags);
1572 /* set AID and assoc capability,
1573 * ieee80211_set_associated() will tell the driver */
1574 bss_conf->aid = aid;
1575 bss_conf->assoc_capability = capab_info;
1576 ieee80211_set_associated(sdata, cbss, changed);
1579 * If we're using 4-addr mode, let the AP know that we're
1580 * doing so, so that it can create the STA VLAN on its side
1582 if (ifmgd->use_4addr)
1583 ieee80211_send_4addr_nullfunc(local, sdata);
1586 * Start timer to probe the connection to the AP now.
1587 * Also start the timer that will detect beacon loss.
1589 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1590 ieee80211_sta_reset_beacon_monitor(sdata);
1596 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1597 struct ieee80211_mgmt *mgmt,
1599 struct ieee80211_rx_status *rx_status,
1600 struct ieee802_11_elems *elems,
1603 struct ieee80211_local *local = sdata->local;
1605 struct ieee80211_bss *bss;
1606 struct ieee80211_channel *channel;
1607 bool need_ps = false;
1609 if (sdata->u.mgd.associated) {
1610 bss = (void *)sdata->u.mgd.associated->priv;
1611 /* not previously set so we may need to recalc */
1612 need_ps = !bss->dtim_period;
1615 if (elems->ds_params && elems->ds_params_len == 1)
1616 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
1619 freq = rx_status->freq;
1621 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1623 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1626 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1629 ieee80211_rx_bss_put(local, bss);
1631 if (!sdata->u.mgd.associated)
1635 mutex_lock(&local->iflist_mtx);
1636 ieee80211_recalc_ps(local, -1);
1637 mutex_unlock(&local->iflist_mtx);
1640 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1641 (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1643 struct ieee80211_channel_sw_ie *sw_elem =
1644 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1645 ieee80211_sta_process_chanswitch(sdata, sw_elem,
1646 bss, rx_status->mactime);
1651 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1652 struct sk_buff *skb)
1654 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1655 struct ieee80211_if_managed *ifmgd;
1656 struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1657 size_t baselen, len = skb->len;
1658 struct ieee802_11_elems elems;
1660 ifmgd = &sdata->u.mgd;
1662 ASSERT_MGD_MTX(ifmgd);
1664 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1665 return; /* ignore ProbeResp to foreign address */
1667 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1671 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1674 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1676 if (ifmgd->associated &&
1677 memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0)
1678 ieee80211_reset_ap_probe(sdata);
1682 * This is the canonical list of information elements we care about,
1683 * the filter code also gives us all changes to the Microsoft OUI
1684 * (00:50:F2) vendor IE which is used for WMM which we need to track.
1686 * We implement beacon filtering in software since that means we can
1687 * avoid processing the frame here and in cfg80211, and userspace
1688 * will not be able to tell whether the hardware supports it or not.
1690 * XXX: This list needs to be dynamic -- userspace needs to be able to
1691 * add items it requires. It also needs to be able to tell us to
1692 * look out for other vendor IEs.
1694 static const u64 care_about_ies =
1695 (1ULL << WLAN_EID_COUNTRY) |
1696 (1ULL << WLAN_EID_ERP_INFO) |
1697 (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1698 (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1699 (1ULL << WLAN_EID_HT_CAPABILITY) |
1700 (1ULL << WLAN_EID_HT_INFORMATION);
1702 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1703 struct ieee80211_mgmt *mgmt,
1705 struct ieee80211_rx_status *rx_status)
1707 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1708 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1710 struct ieee802_11_elems elems;
1711 struct ieee80211_local *local = sdata->local;
1713 bool erp_valid, directed_tim = false;
1718 ASSERT_MGD_MTX(ifmgd);
1720 /* Process beacon from the current BSS */
1721 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1725 if (rx_status->freq != local->hw.conf.channel->center_freq)
1729 * We might have received a number of frames, among them a
1730 * disassoc frame and a beacon...
1732 if (!ifmgd->associated)
1735 bssid = ifmgd->associated->bssid;
1738 * And in theory even frames from a different AP we were just
1739 * associated to a split-second ago!
1741 if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1744 /* Track average RSSI from the Beacon frames of the current AP */
1745 ifmgd->last_beacon_signal = rx_status->signal;
1746 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1747 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1748 ifmgd->ave_beacon_signal = rx_status->signal * 16;
1749 ifmgd->last_cqm_event_signal = 0;
1750 ifmgd->count_beacon_signal = 1;
1752 ifmgd->ave_beacon_signal =
1753 (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1754 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1755 ifmgd->ave_beacon_signal) / 16;
1756 ifmgd->count_beacon_signal++;
1758 if (bss_conf->cqm_rssi_thold &&
1759 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
1760 !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1761 int sig = ifmgd->ave_beacon_signal / 16;
1762 int last_event = ifmgd->last_cqm_event_signal;
1763 int thold = bss_conf->cqm_rssi_thold;
1764 int hyst = bss_conf->cqm_rssi_hyst;
1766 (last_event == 0 || sig < last_event - hyst)) {
1767 ifmgd->last_cqm_event_signal = sig;
1768 ieee80211_cqm_rssi_notify(
1770 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1772 } else if (sig > thold &&
1773 (last_event == 0 || sig > last_event + hyst)) {
1774 ifmgd->last_cqm_event_signal = sig;
1775 ieee80211_cqm_rssi_notify(
1777 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1782 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1783 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1784 if (net_ratelimit()) {
1785 printk(KERN_DEBUG "%s: cancelling probereq poll due "
1786 "to a received beacon\n", sdata->name);
1789 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1790 mutex_lock(&local->iflist_mtx);
1791 ieee80211_recalc_ps(local, -1);
1792 mutex_unlock(&local->iflist_mtx);
1796 * Push the beacon loss detection into the future since
1797 * we are processing a beacon from the AP just now.
1799 ieee80211_sta_reset_beacon_monitor(sdata);
1801 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1802 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1803 len - baselen, &elems,
1804 care_about_ies, ncrc);
1806 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1807 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1810 if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) {
1811 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1814 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1815 elems.wmm_param_len);
1818 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1820 if (local->hw.conf.dynamic_ps_timeout > 0) {
1821 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1822 ieee80211_hw_config(local,
1823 IEEE80211_CONF_CHANGE_PS);
1824 ieee80211_send_nullfunc(local, sdata, 0);
1826 local->pspolling = true;
1829 * Here is assumed that the driver will be
1830 * able to send ps-poll frame and receive a
1831 * response even though power save mode is
1832 * enabled, but some drivers might require
1833 * to disable power save here. This needs
1834 * to be investigated.
1836 ieee80211_send_pspoll(local, sdata);
1841 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
1843 ifmgd->beacon_crc = ncrc;
1844 ifmgd->beacon_crc_valid = true;
1846 if (elems.erp_info && elems.erp_info_len >= 1) {
1848 erp_value = elems.erp_info[0];
1852 changed |= ieee80211_handle_bss_capability(sdata,
1853 le16_to_cpu(mgmt->u.beacon.capab_info),
1854 erp_valid, erp_value);
1857 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1858 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1859 struct sta_info *sta;
1860 struct ieee80211_supported_band *sband;
1861 u16 ap_ht_cap_flags;
1865 sta = sta_info_get(sdata, bssid);
1866 if (WARN_ON(!sta)) {
1871 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1873 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1874 elems.ht_cap_elem, &sta->sta.ht_cap);
1876 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1880 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1881 bssid, ap_ht_cap_flags);
1884 /* Note: country IE parsing is done for us by cfg80211 */
1885 if (elems.country_elem) {
1886 /* TODO: IBSS also needs this */
1887 if (elems.pwr_constr_elem)
1888 ieee80211_handle_pwr_constr(sdata,
1889 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1890 elems.pwr_constr_elem,
1891 elems.pwr_constr_elem_len);
1894 ieee80211_bss_info_change_notify(sdata, changed);
1897 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1898 struct sk_buff *skb)
1900 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1901 struct ieee80211_rx_status *rx_status;
1902 struct ieee80211_mgmt *mgmt;
1903 enum rx_mgmt_action rma = RX_MGMT_NONE;
1906 rx_status = (struct ieee80211_rx_status *) skb->cb;
1907 mgmt = (struct ieee80211_mgmt *) skb->data;
1908 fc = le16_to_cpu(mgmt->frame_control);
1910 mutex_lock(&ifmgd->mtx);
1912 if (ifmgd->associated &&
1913 memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1914 switch (fc & IEEE80211_FCTL_STYPE) {
1915 case IEEE80211_STYPE_BEACON:
1916 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1919 case IEEE80211_STYPE_PROBE_RESP:
1920 ieee80211_rx_mgmt_probe_resp(sdata, skb);
1922 case IEEE80211_STYPE_DEAUTH:
1923 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1925 case IEEE80211_STYPE_DISASSOC:
1926 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1928 case IEEE80211_STYPE_ACTION:
1929 switch (mgmt->u.action.category) {
1930 case WLAN_CATEGORY_SPECTRUM_MGMT:
1931 ieee80211_sta_process_chanswitch(sdata,
1932 &mgmt->u.action.u.chan_switch.sw_elem,
1933 (void *)ifmgd->associated->priv,
1934 rx_status->mactime);
1938 mutex_unlock(&ifmgd->mtx);
1944 case RX_MGMT_CFG80211_DEAUTH:
1945 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1947 case RX_MGMT_CFG80211_DISASSOC:
1948 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1951 WARN(1, "unexpected: %d", rma);
1956 mutex_unlock(&ifmgd->mtx);
1958 if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1959 (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) {
1960 struct ieee80211_local *local = sdata->local;
1961 struct ieee80211_work *wk;
1963 mutex_lock(&local->mtx);
1964 list_for_each_entry(wk, &local->work_list, list) {
1965 if (wk->sdata != sdata)
1968 if (wk->type != IEEE80211_WORK_ASSOC &&
1969 wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
1972 if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN))
1974 if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN))
1978 * Printing the message only here means we can't
1979 * spuriously print it, but it also means that it
1980 * won't be printed when the frame comes in before
1981 * we even tried to associate or in similar cases.
1983 * Ultimately, I suspect cfg80211 should print the
1987 "%s: deauthenticated from %pM (Reason: %u)\n",
1988 sdata->name, mgmt->bssid,
1989 le16_to_cpu(mgmt->u.deauth.reason_code));
1991 list_del_rcu(&wk->list);
1995 mutex_unlock(&local->mtx);
1997 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2001 static void ieee80211_sta_timer(unsigned long data)
2003 struct ieee80211_sub_if_data *sdata =
2004 (struct ieee80211_sub_if_data *) data;
2005 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2006 struct ieee80211_local *local = sdata->local;
2008 if (local->quiescing) {
2009 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2013 ieee80211_queue_work(&local->hw, &sdata->work);
2016 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2019 struct ieee80211_local *local = sdata->local;
2020 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2022 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
2023 IEEE80211_STA_BEACON_POLL);
2025 ieee80211_set_disassoc(sdata, true, true);
2026 mutex_unlock(&ifmgd->mtx);
2027 mutex_lock(&local->mtx);
2028 ieee80211_recalc_idle(local);
2029 mutex_unlock(&local->mtx);
2031 * must be outside lock due to cfg80211,
2032 * but that's not a problem.
2034 ieee80211_send_deauth_disassoc(sdata, bssid,
2035 IEEE80211_STYPE_DEAUTH,
2036 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2038 mutex_lock(&ifmgd->mtx);
2041 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2043 struct ieee80211_local *local = sdata->local;
2044 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2046 /* then process the rest of the work */
2047 mutex_lock(&ifmgd->mtx);
2049 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2050 IEEE80211_STA_CONNECTION_POLL) &&
2051 ifmgd->associated) {
2055 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2057 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2058 max_tries = max_nullfunc_tries;
2060 max_tries = max_probe_tries;
2062 /* ACK received for nullfunc probing frame */
2063 if (!ifmgd->probe_send_count)
2064 ieee80211_reset_ap_probe(sdata);
2065 else if (ifmgd->nullfunc_failed) {
2066 if (ifmgd->probe_send_count < max_tries) {
2067 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2068 wiphy_debug(local->hw.wiphy,
2069 "%s: No ack for nullfunc frame to"
2070 " AP %pM, try %d/%i\n",
2072 ifmgd->probe_send_count, max_tries);
2074 ieee80211_mgd_probe_ap_send(sdata);
2076 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2077 wiphy_debug(local->hw.wiphy,
2078 "%s: No ack for nullfunc frame to"
2079 " AP %pM, disconnecting.\n",
2080 sdata->name, bssid);
2082 ieee80211_sta_connection_lost(sdata, bssid);
2084 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
2085 run_again(ifmgd, ifmgd->probe_timeout);
2086 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2087 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2088 wiphy_debug(local->hw.wiphy,
2089 "%s: Failed to send nullfunc to AP %pM"
2090 " after %dms, disconnecting.\n",
2092 bssid, probe_wait_ms);
2094 ieee80211_sta_connection_lost(sdata, bssid);
2095 } else if (ifmgd->probe_send_count < max_tries) {
2096 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2097 wiphy_debug(local->hw.wiphy,
2098 "%s: No probe response from AP %pM"
2099 " after %dms, try %d/%i\n",
2101 bssid, probe_wait_ms,
2102 ifmgd->probe_send_count, max_tries);
2104 ieee80211_mgd_probe_ap_send(sdata);
2107 * We actually lost the connection ... or did we?
2110 wiphy_debug(local->hw.wiphy,
2111 "%s: No probe response from AP %pM"
2112 " after %dms, disconnecting.\n",
2114 bssid, probe_wait_ms);
2116 ieee80211_sta_connection_lost(sdata, bssid);
2120 mutex_unlock(&ifmgd->mtx);
2123 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2125 struct ieee80211_sub_if_data *sdata =
2126 (struct ieee80211_sub_if_data *) data;
2127 struct ieee80211_local *local = sdata->local;
2129 if (local->quiescing)
2132 ieee80211_queue_work(&sdata->local->hw,
2133 &sdata->u.mgd.beacon_connection_loss_work);
2136 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2138 struct ieee80211_sub_if_data *sdata =
2139 (struct ieee80211_sub_if_data *) data;
2140 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2141 struct ieee80211_local *local = sdata->local;
2143 if (local->quiescing)
2146 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2149 static void ieee80211_sta_monitor_work(struct work_struct *work)
2151 struct ieee80211_sub_if_data *sdata =
2152 container_of(work, struct ieee80211_sub_if_data,
2153 u.mgd.monitor_work);
2155 ieee80211_mgd_probe_ap(sdata, false);
2158 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2160 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2161 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
2162 IEEE80211_STA_CONNECTION_POLL);
2164 /* let's probe the connection once */
2165 ieee80211_queue_work(&sdata->local->hw,
2166 &sdata->u.mgd.monitor_work);
2167 /* and do all the other regular work too */
2168 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2173 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2175 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2178 * we need to use atomic bitops for the running bits
2179 * only because both timers might fire at the same
2180 * time -- the code here is properly synchronised.
2183 cancel_work_sync(&ifmgd->request_smps_work);
2185 cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2186 if (del_timer_sync(&ifmgd->timer))
2187 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2189 cancel_work_sync(&ifmgd->chswitch_work);
2190 if (del_timer_sync(&ifmgd->chswitch_timer))
2191 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2193 cancel_work_sync(&ifmgd->monitor_work);
2194 /* these will just be re-established on connection */
2195 del_timer_sync(&ifmgd->conn_mon_timer);
2196 del_timer_sync(&ifmgd->bcn_mon_timer);
2199 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2201 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2203 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2204 add_timer(&ifmgd->timer);
2205 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2206 add_timer(&ifmgd->chswitch_timer);
2207 ieee80211_sta_reset_beacon_monitor(sdata);
2208 ieee80211_restart_sta_timer(sdata);
2209 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.monitor_work);
2213 /* interface setup */
2214 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2216 struct ieee80211_if_managed *ifmgd;
2218 ifmgd = &sdata->u.mgd;
2219 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2220 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2221 INIT_WORK(&ifmgd->beacon_connection_loss_work,
2222 ieee80211_beacon_connection_loss_work);
2223 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
2224 setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2225 (unsigned long) sdata);
2226 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2227 (unsigned long) sdata);
2228 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2229 (unsigned long) sdata);
2230 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2231 (unsigned long) sdata);
2235 mutex_init(&ifmgd->mtx);
2237 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
2238 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
2240 ifmgd->req_smps = IEEE80211_SMPS_OFF;
2243 /* scan finished notification */
2244 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2246 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2248 /* Restart STA timers */
2250 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2251 ieee80211_restart_sta_timer(sdata);
2255 int ieee80211_max_network_latency(struct notifier_block *nb,
2256 unsigned long data, void *dummy)
2258 s32 latency_usec = (s32) data;
2259 struct ieee80211_local *local =
2260 container_of(nb, struct ieee80211_local,
2261 network_latency_notifier);
2263 mutex_lock(&local->iflist_mtx);
2264 ieee80211_recalc_ps(local, latency_usec);
2265 mutex_unlock(&local->iflist_mtx);
2271 static enum work_done_result
2272 ieee80211_probe_auth_done(struct ieee80211_work *wk,
2273 struct sk_buff *skb)
2276 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
2277 return WORK_DONE_DESTROY;
2280 if (wk->type == IEEE80211_WORK_AUTH) {
2281 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
2282 return WORK_DONE_DESTROY;
2285 mutex_lock(&wk->sdata->u.mgd.mtx);
2286 ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
2287 mutex_unlock(&wk->sdata->u.mgd.mtx);
2289 wk->type = IEEE80211_WORK_AUTH;
2290 wk->probe_auth.tries = 0;
2291 return WORK_DONE_REQUEUE;
2294 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2295 struct cfg80211_auth_request *req)
2298 struct ieee80211_work *wk;
2301 if (req->local_state_change)
2302 return 0; /* no need to update mac80211 state */
2304 switch (req->auth_type) {
2305 case NL80211_AUTHTYPE_OPEN_SYSTEM:
2306 auth_alg = WLAN_AUTH_OPEN;
2308 case NL80211_AUTHTYPE_SHARED_KEY:
2309 if (IS_ERR(sdata->local->wep_tx_tfm))
2311 auth_alg = WLAN_AUTH_SHARED_KEY;
2313 case NL80211_AUTHTYPE_FT:
2314 auth_alg = WLAN_AUTH_FT;
2316 case NL80211_AUTHTYPE_NETWORK_EAP:
2317 auth_alg = WLAN_AUTH_LEAP;
2323 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2327 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2329 if (req->ie && req->ie_len) {
2330 memcpy(wk->ie, req->ie, req->ie_len);
2331 wk->ie_len = req->ie_len;
2334 if (req->key && req->key_len) {
2335 wk->probe_auth.key_len = req->key_len;
2336 wk->probe_auth.key_idx = req->key_idx;
2337 memcpy(wk->probe_auth.key, req->key, req->key_len);
2340 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2341 memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
2342 wk->probe_auth.ssid_len = ssid[1];
2344 wk->probe_auth.algorithm = auth_alg;
2345 wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
2347 /* if we already have a probe, don't probe again */
2348 if (req->bss->proberesp_ies)
2349 wk->type = IEEE80211_WORK_AUTH;
2351 wk->type = IEEE80211_WORK_DIRECT_PROBE;
2352 wk->chan = req->bss->channel;
2353 wk->chan_type = NL80211_CHAN_NO_HT;
2355 wk->done = ieee80211_probe_auth_done;
2357 ieee80211_add_work(wk);
2361 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
2362 struct sk_buff *skb)
2364 struct ieee80211_mgmt *mgmt;
2365 struct ieee80211_rx_status *rx_status;
2366 struct ieee802_11_elems elems;
2370 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
2371 return WORK_DONE_DESTROY;
2374 if (wk->type == IEEE80211_WORK_ASSOC_BEACON_WAIT) {
2375 mutex_lock(&wk->sdata->u.mgd.mtx);
2376 rx_status = (void *) skb->cb;
2377 ieee802_11_parse_elems(skb->data + 24 + 12, skb->len - 24 - 12, &elems);
2378 ieee80211_rx_bss_info(wk->sdata, (void *)skb->data, skb->len, rx_status,
2380 mutex_unlock(&wk->sdata->u.mgd.mtx);
2382 wk->type = IEEE80211_WORK_ASSOC;
2383 /* not really done yet */
2384 return WORK_DONE_REQUEUE;
2387 mgmt = (void *)skb->data;
2388 status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2390 if (status == WLAN_STATUS_SUCCESS) {
2391 mutex_lock(&wk->sdata->u.mgd.mtx);
2392 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
2393 mutex_unlock(&wk->sdata->u.mgd.mtx);
2394 /* oops -- internal error -- send timeout for now */
2395 cfg80211_send_assoc_timeout(wk->sdata->dev,
2397 return WORK_DONE_DESTROY;
2400 mutex_unlock(&wk->sdata->u.mgd.mtx);
2403 cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2404 return WORK_DONE_DESTROY;
2407 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2408 struct cfg80211_assoc_request *req)
2410 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2411 struct ieee80211_bss *bss = (void *)req->bss->priv;
2412 struct ieee80211_work *wk;
2416 mutex_lock(&ifmgd->mtx);
2417 if (ifmgd->associated) {
2418 if (!req->prev_bssid ||
2419 memcmp(req->prev_bssid, ifmgd->associated->bssid,
2422 * We are already associated and the request was not a
2423 * reassociation request from the current BSS, so
2426 mutex_unlock(&ifmgd->mtx);
2430 /* Trying to reassociate - clear previous association state */
2431 ieee80211_set_disassoc(sdata, true, false);
2433 mutex_unlock(&ifmgd->mtx);
2435 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2439 ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2440 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2442 ifmgd->beacon_crc_valid = false;
2444 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2445 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2446 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2447 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2448 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2451 if (req->ie && req->ie_len) {
2452 memcpy(wk->ie, req->ie, req->ie_len);
2453 wk->ie_len = req->ie_len;
2457 wk->assoc.bss = req->bss;
2459 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2461 /* new association always uses requested smps mode */
2462 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2463 if (ifmgd->powersave)
2464 ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2466 ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2468 ifmgd->ap_smps = ifmgd->req_smps;
2470 wk->assoc.smps = ifmgd->ap_smps;
2472 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2473 * We still associate in non-HT mode (11a/b/g) if any one of these
2474 * ciphers is configured as pairwise.
2475 * We can set this to true for non-11n hardware, that'll be checked
2476 * separately along with the peer capabilities.
2478 wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2479 wk->assoc.capability = req->bss->capability;
2480 wk->assoc.wmm_used = bss->wmm_used;
2481 wk->assoc.supp_rates = bss->supp_rates;
2482 wk->assoc.supp_rates_len = bss->supp_rates_len;
2483 wk->assoc.ht_information_ie =
2484 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2486 if (bss->wmm_used && bss->uapsd_supported &&
2487 (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2488 wk->assoc.uapsd_used = true;
2489 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2491 wk->assoc.uapsd_used = false;
2492 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2495 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2496 memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2497 wk->assoc.ssid_len = ssid[1];
2499 if (req->prev_bssid)
2500 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2502 wk->chan = req->bss->channel;
2503 wk->chan_type = NL80211_CHAN_NO_HT;
2505 wk->done = ieee80211_assoc_done;
2506 if (!bss->dtim_period &&
2507 sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
2508 wk->type = IEEE80211_WORK_ASSOC_BEACON_WAIT;
2510 wk->type = IEEE80211_WORK_ASSOC;
2513 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2514 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2516 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2517 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2520 if (req->crypto.control_port)
2521 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2523 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2525 sdata->control_port_protocol = req->crypto.control_port_ethertype;
2526 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
2528 ieee80211_add_work(wk);
2532 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2533 struct cfg80211_deauth_request *req,
2536 struct ieee80211_local *local = sdata->local;
2537 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2538 struct ieee80211_work *wk;
2540 bool assoc_bss = false;
2542 mutex_lock(&ifmgd->mtx);
2544 memcpy(bssid, req->bss->bssid, ETH_ALEN);
2545 if (ifmgd->associated == req->bss) {
2546 ieee80211_set_disassoc(sdata, false, true);
2547 mutex_unlock(&ifmgd->mtx);
2550 bool not_auth_yet = false;
2552 mutex_unlock(&ifmgd->mtx);
2554 mutex_lock(&local->mtx);
2555 list_for_each_entry(wk, &local->work_list, list) {
2556 if (wk->sdata != sdata)
2559 if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2560 wk->type != IEEE80211_WORK_AUTH &&
2561 wk->type != IEEE80211_WORK_ASSOC &&
2562 wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
2565 if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2568 not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2569 list_del_rcu(&wk->list);
2573 mutex_unlock(&local->mtx);
2576 * If somebody requests authentication and we haven't
2577 * sent out an auth frame yet there's no need to send
2578 * out a deauth frame either. If the state was PROBE,
2579 * then this is the case. If it's AUTH we have sent a
2580 * frame, and if it's IDLE we have completed the auth
2584 __cfg80211_auth_canceled(sdata->dev, bssid);
2589 printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2590 sdata->name, bssid, req->reason_code);
2592 ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2593 req->reason_code, cookie,
2594 !req->local_state_change);
2596 sta_info_destroy_addr(sdata, bssid);
2598 mutex_lock(&sdata->local->mtx);
2599 ieee80211_recalc_idle(sdata->local);
2600 mutex_unlock(&sdata->local->mtx);
2605 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2606 struct cfg80211_disassoc_request *req,
2609 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2612 mutex_lock(&ifmgd->mtx);
2615 * cfg80211 should catch this ... but it's racy since
2616 * we can receive a disassoc frame, process it, hand it
2617 * to cfg80211 while that's in a locked section already
2618 * trying to tell us that the user wants to disconnect.
2620 if (ifmgd->associated != req->bss) {
2621 mutex_unlock(&ifmgd->mtx);
2625 printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2626 sdata->name, req->bss->bssid, req->reason_code);
2628 memcpy(bssid, req->bss->bssid, ETH_ALEN);
2629 ieee80211_set_disassoc(sdata, false, true);
2631 mutex_unlock(&ifmgd->mtx);
2633 ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2634 IEEE80211_STYPE_DISASSOC, req->reason_code,
2635 cookie, !req->local_state_change);
2636 sta_info_destroy_addr(sdata, bssid);
2638 mutex_lock(&sdata->local->mtx);
2639 ieee80211_recalc_idle(sdata->local);
2640 mutex_unlock(&sdata->local->mtx);
2645 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2646 enum nl80211_cqm_rssi_threshold_event rssi_event,
2649 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2651 trace_api_cqm_rssi_notify(sdata, rssi_event);
2653 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2655 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
2657 unsigned char ieee80211_get_operstate(struct ieee80211_vif *vif)
2659 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2660 return sdata->dev->operstate;
2662 EXPORT_SYMBOL(ieee80211_get_operstate);