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 #define IEEE80211_MAX_NULLFUNC_TRIES 2
32 #define IEEE80211_MAX_PROBE_TRIES 5
35 * Beacon loss timeout is calculated as N frames times the
36 * advertised beacon interval. This may need to be somewhat
37 * higher than what hardware might detect to account for
38 * delays in the host processing frames. But since we also
39 * probe on beacon miss before declaring the connection lost
40 * default to what we want.
42 #define IEEE80211_BEACON_LOSS_COUNT 7
45 * Time the connection can be idle before we probe
46 * it to see if we can still talk to the AP.
48 #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ)
50 * Time we wait for a probe response after sending
51 * a probe request because of beacon loss or for
52 * checking the connection still works.
54 #define IEEE80211_PROBE_WAIT (HZ / 2)
57 * Weight given to the latest Beacon frame when calculating average signal
58 * strength for Beacon frames received in the current BSS. This must be
61 #define IEEE80211_SIGNAL_AVE_WEIGHT 3
64 * How many Beacon frames need to have been used in average signal strength
65 * before starting to indicate signal change events.
67 #define IEEE80211_SIGNAL_AVE_MIN_COUNT 4
69 #define TMR_RUNNING_TIMER 0
70 #define TMR_RUNNING_CHANSW 1
73 * All cfg80211 functions have to be called outside a locked
74 * section so that they can acquire a lock themselves... This
75 * is much simpler than queuing up things in cfg80211, but we
76 * do need some indirection for that here.
79 /* no action required */
82 /* caller must call cfg80211_send_rx_auth() */
83 RX_MGMT_CFG80211_AUTH,
85 /* caller must call cfg80211_send_rx_assoc() */
86 RX_MGMT_CFG80211_ASSOC,
88 /* caller must call cfg80211_send_deauth() */
89 RX_MGMT_CFG80211_DEAUTH,
91 /* caller must call cfg80211_send_disassoc() */
92 RX_MGMT_CFG80211_DISASSOC,
94 /* caller must tell cfg80211 about internal error */
95 RX_MGMT_CFG80211_ASSOC_ERROR,
99 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
101 lockdep_assert_held(&ifmgd->mtx);
105 * We can have multiple work items (and connection probing)
106 * scheduling this timer, but we need to take care to only
107 * reschedule it when it should fire _earlier_ than it was
108 * asked for before, or if it's not pending right now. This
109 * function ensures that. Note that it then is required to
110 * run this function for all timeouts after the first one
111 * has happened -- the work that runs from this timer will
114 static void run_again(struct ieee80211_if_managed *ifmgd,
115 unsigned long timeout)
117 ASSERT_MGD_MTX(ifmgd);
119 if (!timer_pending(&ifmgd->timer) ||
120 time_before(timeout, ifmgd->timer.expires))
121 mod_timer(&ifmgd->timer, timeout);
124 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
126 if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
129 mod_timer(&sdata->u.mgd.bcn_mon_timer,
130 round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
133 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
135 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
137 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
140 mod_timer(&sdata->u.mgd.conn_mon_timer,
141 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
143 ifmgd->probe_send_count = 0;
146 static int ecw2cw(int ecw)
148 return (1 << ecw) - 1;
152 * ieee80211_enable_ht should be called only after the operating band
153 * has been determined as ht configuration depends on the hw's
154 * HT abilities for a specific band.
156 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
157 struct ieee80211_ht_info *hti,
158 const u8 *bssid, u16 ap_ht_cap_flags)
160 struct ieee80211_local *local = sdata->local;
161 struct ieee80211_supported_band *sband;
162 struct sta_info *sta;
165 bool enable_ht = true;
166 enum nl80211_channel_type prev_chantype;
167 enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
169 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
171 prev_chantype = sdata->vif.bss_conf.channel_type;
173 /* HT is not supported */
174 if (!sband->ht_cap.ht_supported)
177 /* check that channel matches the right operating channel */
178 if (local->hw.conf.channel->center_freq !=
179 ieee80211_channel_to_frequency(hti->control_chan))
183 channel_type = NL80211_CHAN_HT20;
185 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
186 (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
187 (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
188 switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
189 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
190 if (!(local->hw.conf.channel->flags &
191 IEEE80211_CHAN_NO_HT40PLUS))
192 channel_type = NL80211_CHAN_HT40PLUS;
194 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
195 if (!(local->hw.conf.channel->flags &
196 IEEE80211_CHAN_NO_HT40MINUS))
197 channel_type = NL80211_CHAN_HT40MINUS;
203 if (local->tmp_channel)
204 local->tmp_channel_type = channel_type;
206 if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
207 /* can only fail due to HT40+/- mismatch */
208 channel_type = NL80211_CHAN_HT20;
209 WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type));
212 /* channel_type change automatically detected */
213 ieee80211_hw_config(local, 0);
215 if (prev_chantype != channel_type) {
217 sta = sta_info_get(sdata, bssid);
219 rate_control_rate_update(local, sband, sta,
220 IEEE80211_RC_HT_CHANGED,
225 ht_opmode = le16_to_cpu(hti->operation_mode);
227 /* if bss configuration changed store the new one */
228 if (sdata->ht_opmode_valid != enable_ht ||
229 sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
230 prev_chantype != channel_type) {
231 changed |= BSS_CHANGED_HT;
232 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
233 sdata->ht_opmode_valid = enable_ht;
239 /* frame sending functions */
241 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
242 const u8 *bssid, u16 stype, u16 reason,
243 void *cookie, bool send_frame)
245 struct ieee80211_local *local = sdata->local;
246 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
248 struct ieee80211_mgmt *mgmt;
250 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
252 printk(KERN_DEBUG "%s: failed to allocate buffer for "
253 "deauth/disassoc frame\n", sdata->name);
256 skb_reserve(skb, local->hw.extra_tx_headroom);
258 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
260 memcpy(mgmt->da, bssid, ETH_ALEN);
261 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
262 memcpy(mgmt->bssid, bssid, ETH_ALEN);
263 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
265 /* u.deauth.reason_code == u.disassoc.reason_code */
266 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
268 if (stype == IEEE80211_STYPE_DEAUTH)
270 __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
272 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
275 __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
277 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
278 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
279 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
282 ieee80211_tx_skb(sdata, skb);
287 void ieee80211_send_pspoll(struct ieee80211_local *local,
288 struct ieee80211_sub_if_data *sdata)
290 struct ieee80211_pspoll *pspoll;
293 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
297 pspoll = (struct ieee80211_pspoll *) skb->data;
298 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
300 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
301 ieee80211_tx_skb(sdata, skb);
304 void ieee80211_send_nullfunc(struct ieee80211_local *local,
305 struct ieee80211_sub_if_data *sdata,
309 struct ieee80211_hdr_3addr *nullfunc;
311 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
315 nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
317 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
319 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
320 ieee80211_tx_skb(sdata, skb);
323 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
324 struct ieee80211_sub_if_data *sdata)
327 struct ieee80211_hdr *nullfunc;
330 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
333 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
335 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
336 "nullfunc frame\n", sdata->name);
339 skb_reserve(skb, local->hw.extra_tx_headroom);
341 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
342 memset(nullfunc, 0, 30);
343 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
344 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
345 nullfunc->frame_control = fc;
346 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
347 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
348 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
349 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
351 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
352 ieee80211_tx_skb(sdata, skb);
355 /* spectrum management related things */
356 static void ieee80211_chswitch_work(struct work_struct *work)
358 struct ieee80211_sub_if_data *sdata =
359 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
360 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
362 if (!ieee80211_sdata_running(sdata))
365 mutex_lock(&ifmgd->mtx);
366 if (!ifmgd->associated)
369 sdata->local->oper_channel = sdata->local->csa_channel;
370 if (!sdata->local->ops->channel_switch) {
371 /* call "hw_config" only if doing sw channel switch */
372 ieee80211_hw_config(sdata->local,
373 IEEE80211_CONF_CHANGE_CHANNEL);
376 /* XXX: shouldn't really modify cfg80211-owned data! */
377 ifmgd->associated->channel = sdata->local->oper_channel;
379 ieee80211_wake_queues_by_reason(&sdata->local->hw,
380 IEEE80211_QUEUE_STOP_REASON_CSA);
382 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
383 mutex_unlock(&ifmgd->mtx);
386 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
388 struct ieee80211_sub_if_data *sdata;
389 struct ieee80211_if_managed *ifmgd;
391 sdata = vif_to_sdata(vif);
392 ifmgd = &sdata->u.mgd;
394 trace_api_chswitch_done(sdata, success);
397 * If the channel switch was not successful, stay
398 * around on the old channel. We currently lack
399 * good handling of this situation, possibly we
400 * should just drop the association.
402 sdata->local->csa_channel = sdata->local->oper_channel;
405 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
407 EXPORT_SYMBOL(ieee80211_chswitch_done);
409 static void ieee80211_chswitch_timer(unsigned long data)
411 struct ieee80211_sub_if_data *sdata =
412 (struct ieee80211_sub_if_data *) data;
413 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
415 if (sdata->local->quiescing) {
416 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
420 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
423 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
424 struct ieee80211_channel_sw_ie *sw_elem,
425 struct ieee80211_bss *bss,
428 struct cfg80211_bss *cbss =
429 container_of((void *)bss, struct cfg80211_bss, priv);
430 struct ieee80211_channel *new_ch;
431 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
432 int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
434 ASSERT_MGD_MTX(ifmgd);
436 if (!ifmgd->associated)
439 if (sdata->local->scanning)
442 /* Disregard subsequent beacons if we are already running a timer
445 if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
448 new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
449 if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
452 sdata->local->csa_channel = new_ch;
454 if (sdata->local->ops->channel_switch) {
455 /* use driver's channel switch callback */
456 struct ieee80211_channel_switch ch_switch;
457 memset(&ch_switch, 0, sizeof(ch_switch));
458 ch_switch.timestamp = timestamp;
460 ch_switch.block_tx = true;
461 ieee80211_stop_queues_by_reason(&sdata->local->hw,
462 IEEE80211_QUEUE_STOP_REASON_CSA);
464 ch_switch.channel = new_ch;
465 ch_switch.count = sw_elem->count;
466 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
467 drv_channel_switch(sdata->local, &ch_switch);
471 /* channel switch handled in software */
472 if (sw_elem->count <= 1) {
473 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
476 ieee80211_stop_queues_by_reason(&sdata->local->hw,
477 IEEE80211_QUEUE_STOP_REASON_CSA);
478 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
479 mod_timer(&ifmgd->chswitch_timer,
481 msecs_to_jiffies(sw_elem->count *
482 cbss->beacon_interval));
486 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
487 u16 capab_info, u8 *pwr_constr_elem,
488 u8 pwr_constr_elem_len)
490 struct ieee80211_conf *conf = &sdata->local->hw.conf;
492 if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
495 /* Power constraint IE length should be 1 octet */
496 if (pwr_constr_elem_len != 1)
499 if ((*pwr_constr_elem <= conf->channel->max_power) &&
500 (*pwr_constr_elem != sdata->local->power_constr_level)) {
501 sdata->local->power_constr_level = *pwr_constr_elem;
502 ieee80211_hw_config(sdata->local, 0);
506 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
508 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
509 struct ieee80211_local *local = sdata->local;
510 struct ieee80211_conf *conf = &local->hw.conf;
512 WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
513 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
514 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
516 local->disable_dynamic_ps = false;
517 conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
519 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
521 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
523 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
524 struct ieee80211_local *local = sdata->local;
525 struct ieee80211_conf *conf = &local->hw.conf;
527 WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
528 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
529 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
531 local->disable_dynamic_ps = true;
532 conf->dynamic_ps_timeout = 0;
533 del_timer_sync(&local->dynamic_ps_timer);
534 ieee80211_queue_work(&local->hw,
535 &local->dynamic_ps_enable_work);
537 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
540 static void ieee80211_enable_ps(struct ieee80211_local *local,
541 struct ieee80211_sub_if_data *sdata)
543 struct ieee80211_conf *conf = &local->hw.conf;
546 * If we are scanning right now then the parameters will
547 * take effect when scan finishes.
552 if (conf->dynamic_ps_timeout > 0 &&
553 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
554 mod_timer(&local->dynamic_ps_timer, jiffies +
555 msecs_to_jiffies(conf->dynamic_ps_timeout));
557 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
558 ieee80211_send_nullfunc(local, sdata, 1);
560 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
561 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
564 conf->flags |= IEEE80211_CONF_PS;
565 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
569 static void ieee80211_change_ps(struct ieee80211_local *local)
571 struct ieee80211_conf *conf = &local->hw.conf;
573 if (local->ps_sdata) {
574 ieee80211_enable_ps(local, local->ps_sdata);
575 } else if (conf->flags & IEEE80211_CONF_PS) {
576 conf->flags &= ~IEEE80211_CONF_PS;
577 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
578 del_timer_sync(&local->dynamic_ps_timer);
579 cancel_work_sync(&local->dynamic_ps_enable_work);
583 /* need to hold RTNL or interface lock */
584 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
586 struct ieee80211_sub_if_data *sdata, *found = NULL;
590 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
591 local->ps_sdata = NULL;
595 if (!list_empty(&local->work_list)) {
596 local->ps_sdata = NULL;
600 list_for_each_entry(sdata, &local->interfaces, list) {
601 if (!ieee80211_sdata_running(sdata))
603 if (sdata->vif.type != NL80211_IFTYPE_STATION)
609 if (count == 1 && found->u.mgd.powersave &&
610 found->u.mgd.associated &&
611 found->u.mgd.associated->beacon_ies &&
612 !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
613 IEEE80211_STA_CONNECTION_POLL))) {
614 struct ieee80211_conf *conf = &local->hw.conf;
618 latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
620 beaconint_us = ieee80211_tu_to_usec(
621 found->vif.bss_conf.beacon_int);
623 timeout = local->dynamic_ps_forced_timeout;
626 * Go to full PSM if the user configures a very low
627 * latency requirement.
628 * The 2000 second value is there for compatibility
629 * until the PM_QOS_NETWORK_LATENCY is configured
632 if (latency > (1900 * USEC_PER_MSEC) &&
633 latency != (2000 * USEC_PER_SEC))
638 local->dynamic_ps_user_timeout = timeout;
639 if (!local->disable_dynamic_ps)
640 conf->dynamic_ps_timeout =
641 local->dynamic_ps_user_timeout;
643 if (beaconint_us > latency) {
644 local->ps_sdata = NULL;
646 struct ieee80211_bss *bss;
650 bss = (void *)found->u.mgd.associated->priv;
651 dtimper = bss->dtim_period;
653 /* If the TIM IE is invalid, pretend the value is 1 */
656 else if (dtimper > 1)
657 maxslp = min_t(int, dtimper,
658 latency / beaconint_us);
660 local->hw.conf.max_sleep_period = maxslp;
661 local->hw.conf.ps_dtim_period = dtimper;
662 local->ps_sdata = found;
665 local->ps_sdata = NULL;
669 ieee80211_change_ps(local);
672 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
674 struct ieee80211_local *local =
675 container_of(work, struct ieee80211_local,
676 dynamic_ps_disable_work);
678 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
679 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
680 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
683 ieee80211_wake_queues_by_reason(&local->hw,
684 IEEE80211_QUEUE_STOP_REASON_PS);
687 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
689 struct ieee80211_local *local =
690 container_of(work, struct ieee80211_local,
691 dynamic_ps_enable_work);
692 struct ieee80211_sub_if_data *sdata = local->ps_sdata;
693 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
695 /* can only happen when PS was just disabled anyway */
699 if (local->hw.conf.flags & IEEE80211_CONF_PS)
702 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
703 (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
704 ieee80211_send_nullfunc(local, sdata, 1);
706 if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
707 (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
708 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
709 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
710 local->hw.conf.flags |= IEEE80211_CONF_PS;
711 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
715 void ieee80211_dynamic_ps_timer(unsigned long data)
717 struct ieee80211_local *local = (void *) data;
719 if (local->quiescing || local->suspended)
722 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
726 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
727 struct ieee80211_sub_if_data *sdata,
728 u8 *wmm_param, size_t wmm_param_len)
730 struct ieee80211_tx_queue_params params;
731 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
734 u8 *pos, uapsd_queues = 0;
736 if (!local->ops->conf_tx)
739 if (local->hw.queues < 4)
745 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
748 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
749 uapsd_queues = local->uapsd_queues;
751 count = wmm_param[6] & 0x0f;
752 if (count == ifmgd->wmm_last_param_set)
754 ifmgd->wmm_last_param_set = count;
757 left = wmm_param_len - 8;
759 memset(¶ms, 0, sizeof(params));
762 for (; left >= 4; left -= 4, pos += 4) {
763 int aci = (pos[0] >> 5) & 0x03;
764 int acm = (pos[0] >> 4) & 0x01;
772 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
773 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
779 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
780 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
786 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
787 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
794 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
795 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
800 params.aifs = pos[0] & 0x0f;
801 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
802 params.cw_min = ecw2cw(pos[1] & 0x0f);
803 params.txop = get_unaligned_le16(pos + 2);
804 params.uapsd = uapsd;
806 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
807 wiphy_debug(local->hw.wiphy,
808 "WMM queue=%d aci=%d acm=%d aifs=%d "
809 "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
811 params.aifs, params.cw_min, params.cw_max,
812 params.txop, params.uapsd);
814 if (drv_conf_tx(local, queue, ¶ms))
815 wiphy_debug(local->hw.wiphy,
816 "failed to set TX queue parameters for queue %d\n",
820 /* enable WMM or activate new settings */
821 sdata->vif.bss_conf.qos = true;
822 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
825 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
826 u16 capab, bool erp_valid, u8 erp)
828 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
831 bool use_short_preamble;
835 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
836 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
838 use_protection = false;
839 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
842 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
843 if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
844 use_short_slot = true;
846 if (use_protection != bss_conf->use_cts_prot) {
847 bss_conf->use_cts_prot = use_protection;
848 changed |= BSS_CHANGED_ERP_CTS_PROT;
851 if (use_short_preamble != bss_conf->use_short_preamble) {
852 bss_conf->use_short_preamble = use_short_preamble;
853 changed |= BSS_CHANGED_ERP_PREAMBLE;
856 if (use_short_slot != bss_conf->use_short_slot) {
857 bss_conf->use_short_slot = use_short_slot;
858 changed |= BSS_CHANGED_ERP_SLOT;
864 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
865 struct cfg80211_bss *cbss,
866 u32 bss_info_changed)
868 struct ieee80211_bss *bss = (void *)cbss->priv;
869 struct ieee80211_local *local = sdata->local;
870 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
872 bss_info_changed |= BSS_CHANGED_ASSOC;
873 /* set timing information */
874 bss_conf->beacon_int = cbss->beacon_interval;
875 bss_conf->timestamp = cbss->tsf;
877 bss_info_changed |= BSS_CHANGED_BEACON_INT;
878 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
879 cbss->capability, bss->has_erp_value, bss->erp_value);
881 sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
882 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
884 sdata->u.mgd.associated = cbss;
885 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
887 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
889 /* just to be sure */
890 sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
891 IEEE80211_STA_BEACON_POLL);
893 ieee80211_led_assoc(local, 1);
895 if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
896 bss_conf->dtim_period = bss->dtim_period;
898 bss_conf->dtim_period = 0;
902 * For now just always ask the driver to update the basic rateset
903 * when we have associated, we aren't checking whether it actually
906 bss_info_changed |= BSS_CHANGED_BASIC_RATES;
908 /* And the BSSID changed - we're associated now */
909 bss_info_changed |= BSS_CHANGED_BSSID;
911 /* Tell the driver to monitor connection quality (if supported) */
912 if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
913 bss_conf->cqm_rssi_thold)
914 bss_info_changed |= BSS_CHANGED_CQM;
916 /* Enable ARP filtering */
917 if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
918 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
919 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
922 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
924 mutex_lock(&local->iflist_mtx);
925 ieee80211_recalc_ps(local, -1);
926 ieee80211_recalc_smps(local);
927 mutex_unlock(&local->iflist_mtx);
929 netif_tx_start_all_queues(sdata->dev);
930 netif_carrier_on(sdata->dev);
933 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
934 bool remove_sta, bool tx)
936 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
937 struct ieee80211_local *local = sdata->local;
938 struct sta_info *sta;
939 u32 changed = 0, config_changed = 0;
942 ASSERT_MGD_MTX(ifmgd);
944 if (WARN_ON(!ifmgd->associated))
947 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
949 ifmgd->associated = NULL;
950 memset(ifmgd->bssid, 0, ETH_ALEN);
953 * we need to commit the associated = NULL change because the
954 * scan code uses that to determine whether this iface should
955 * go to/wake up from powersave or not -- and could otherwise
956 * wake the queues erroneously.
961 * Thus, we can only afterwards stop the queues -- to account
962 * for the case where another CPU is finishing a scan at this
963 * time -- we don't want the scan code to enable queues.
966 netif_tx_stop_all_queues(sdata->dev);
967 netif_carrier_off(sdata->dev);
969 mutex_lock(&local->sta_mtx);
970 sta = sta_info_get(sdata, bssid);
972 set_sta_flags(sta, WLAN_STA_BLOCK_BA);
973 ieee80211_sta_tear_down_BA_sessions(sta, tx);
975 mutex_unlock(&local->sta_mtx);
977 changed |= ieee80211_reset_erp_info(sdata);
979 ieee80211_led_assoc(local, 0);
980 changed |= BSS_CHANGED_ASSOC;
981 sdata->vif.bss_conf.assoc = false;
983 ieee80211_set_wmm_default(sdata);
985 /* channel(_type) changes are handled by ieee80211_hw_config */
986 WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
988 /* on the next assoc, re-program HT parameters */
989 sdata->ht_opmode_valid = false;
991 local->power_constr_level = 0;
993 del_timer_sync(&local->dynamic_ps_timer);
994 cancel_work_sync(&local->dynamic_ps_enable_work);
996 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
997 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
998 config_changed |= IEEE80211_CONF_CHANGE_PS;
1001 ieee80211_hw_config(local, config_changed);
1003 /* Disable ARP filtering */
1004 if (sdata->vif.bss_conf.arp_filter_enabled) {
1005 sdata->vif.bss_conf.arp_filter_enabled = false;
1006 changed |= BSS_CHANGED_ARP_FILTER;
1009 /* The BSSID (not really interesting) and HT changed */
1010 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1011 ieee80211_bss_info_change_notify(sdata, changed);
1014 sta_info_destroy_addr(sdata, bssid);
1016 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1017 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1018 del_timer_sync(&sdata->u.mgd.timer);
1019 del_timer_sync(&sdata->u.mgd.chswitch_timer);
1022 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1023 struct ieee80211_hdr *hdr)
1026 * We can postpone the mgd.timer whenever receiving unicast frames
1027 * from AP because we know that the connection is working both ways
1028 * at that time. But multicast frames (and hence also beacons) must
1029 * be ignored here, because we need to trigger the timer during
1030 * data idle periods for sending the periodic probe request to the
1031 * AP we're connected to.
1033 if (is_multicast_ether_addr(hdr->addr1))
1037 * In case we receive frames after disassociation.
1039 if (!sdata->u.mgd.associated)
1042 ieee80211_sta_reset_conn_monitor(sdata);
1045 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1047 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1049 if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1050 IEEE80211_STA_CONNECTION_POLL)))
1053 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1054 IEEE80211_STA_BEACON_POLL);
1055 mutex_lock(&sdata->local->iflist_mtx);
1056 ieee80211_recalc_ps(sdata->local, -1);
1057 mutex_unlock(&sdata->local->iflist_mtx);
1059 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1063 * We've received a probe response, but are not sure whether
1064 * we have or will be receiving any beacons or data, so let's
1065 * schedule the timers again, just in case.
1067 ieee80211_sta_reset_beacon_monitor(sdata);
1069 mod_timer(&ifmgd->conn_mon_timer,
1070 round_jiffies_up(jiffies +
1071 IEEE80211_CONNECTION_IDLE_TIME));
1074 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1075 struct ieee80211_hdr *hdr, bool ack)
1077 if (!ieee80211_is_data(hdr->frame_control))
1081 ieee80211_sta_reset_conn_monitor(sdata);
1083 if (ieee80211_is_nullfunc(hdr->frame_control) &&
1084 sdata->u.mgd.probe_send_count > 0) {
1086 sdata->u.mgd.probe_send_count = 0;
1088 sdata->u.mgd.nullfunc_failed = true;
1089 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1093 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1095 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1097 u8 *dst = ifmgd->associated->bssid;
1098 u8 unicast_limit = max(1, IEEE80211_MAX_PROBE_TRIES - 3);
1101 * Try sending broadcast probe requests for the last three
1102 * probe requests after the first ones failed since some
1103 * buggy APs only support broadcast probe requests.
1105 if (ifmgd->probe_send_count >= unicast_limit)
1109 * When the hardware reports an accurate Tx ACK status, it's
1110 * better to send a nullfunc frame instead of a probe request,
1111 * as it will kick us off the AP quickly if we aren't associated
1112 * anymore. The timeout will be reset if the frame is ACKed by
1115 if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1116 ifmgd->nullfunc_failed = false;
1117 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1119 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1120 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid[1], NULL, 0);
1123 ifmgd->probe_send_count++;
1124 ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
1125 run_again(ifmgd, ifmgd->probe_timeout);
1128 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1131 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1132 bool already = false;
1134 if (!ieee80211_sdata_running(sdata))
1137 if (sdata->local->scanning)
1140 if (sdata->local->tmp_channel)
1143 mutex_lock(&ifmgd->mtx);
1145 if (!ifmgd->associated)
1148 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1149 if (beacon && net_ratelimit())
1150 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1151 "- sending probe request\n", sdata->name);
1155 * The driver/our work has already reported this event or the
1156 * connection monitoring has kicked in and we have already sent
1157 * a probe request. Or maybe the AP died and the driver keeps
1158 * reporting until we disassociate...
1160 * In either case we have to ignore the current call to this
1161 * function (except for setting the correct probe reason bit)
1162 * because otherwise we would reset the timer every time and
1163 * never check whether we received a probe response!
1165 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1166 IEEE80211_STA_CONNECTION_POLL))
1170 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1172 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1177 mutex_lock(&sdata->local->iflist_mtx);
1178 ieee80211_recalc_ps(sdata->local, -1);
1179 mutex_unlock(&sdata->local->iflist_mtx);
1181 ifmgd->probe_send_count = 0;
1182 ieee80211_mgd_probe_ap_send(sdata);
1184 mutex_unlock(&ifmgd->mtx);
1187 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1188 struct ieee80211_vif *vif)
1190 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1191 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1192 struct sk_buff *skb;
1195 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1198 ASSERT_MGD_MTX(ifmgd);
1200 if (!ifmgd->associated)
1203 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1204 skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid,
1205 ssid + 2, ssid[1], NULL, 0);
1209 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1211 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1213 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1214 struct ieee80211_local *local = sdata->local;
1217 mutex_lock(&ifmgd->mtx);
1218 if (!ifmgd->associated) {
1219 mutex_unlock(&ifmgd->mtx);
1223 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1225 printk(KERN_DEBUG "Connection to AP %pM lost.\n", bssid);
1227 ieee80211_set_disassoc(sdata, true, true);
1228 mutex_unlock(&ifmgd->mtx);
1230 mutex_lock(&local->mtx);
1231 ieee80211_recalc_idle(local);
1232 mutex_unlock(&local->mtx);
1234 * must be outside lock due to cfg80211,
1235 * but that's not a problem.
1237 ieee80211_send_deauth_disassoc(sdata, bssid,
1238 IEEE80211_STYPE_DEAUTH,
1239 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1243 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1245 struct ieee80211_sub_if_data *sdata =
1246 container_of(work, struct ieee80211_sub_if_data,
1247 u.mgd.beacon_connection_loss_work);
1249 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1250 __ieee80211_connection_loss(sdata);
1252 ieee80211_mgd_probe_ap(sdata, true);
1255 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1257 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1258 struct ieee80211_hw *hw = &sdata->local->hw;
1260 trace_api_beacon_loss(sdata);
1262 WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1263 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1265 EXPORT_SYMBOL(ieee80211_beacon_loss);
1267 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1269 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1270 struct ieee80211_hw *hw = &sdata->local->hw;
1272 trace_api_connection_loss(sdata);
1274 WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1275 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1277 EXPORT_SYMBOL(ieee80211_connection_loss);
1280 static enum rx_mgmt_action __must_check
1281 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1282 struct ieee80211_mgmt *mgmt, size_t len)
1284 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1285 const u8 *bssid = NULL;
1289 return RX_MGMT_NONE;
1291 ASSERT_MGD_MTX(ifmgd);
1293 bssid = ifmgd->associated->bssid;
1295 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1297 printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1298 sdata->name, bssid, reason_code);
1300 ieee80211_set_disassoc(sdata, true, false);
1301 mutex_lock(&sdata->local->mtx);
1302 ieee80211_recalc_idle(sdata->local);
1303 mutex_unlock(&sdata->local->mtx);
1305 return RX_MGMT_CFG80211_DEAUTH;
1309 static enum rx_mgmt_action __must_check
1310 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1311 struct ieee80211_mgmt *mgmt, size_t len)
1313 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1317 return RX_MGMT_NONE;
1319 ASSERT_MGD_MTX(ifmgd);
1321 if (WARN_ON(!ifmgd->associated))
1322 return RX_MGMT_NONE;
1324 if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1325 return RX_MGMT_NONE;
1327 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1329 printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1330 sdata->name, mgmt->sa, reason_code);
1332 ieee80211_set_disassoc(sdata, true, false);
1333 mutex_lock(&sdata->local->mtx);
1334 ieee80211_recalc_idle(sdata->local);
1335 mutex_unlock(&sdata->local->mtx);
1336 return RX_MGMT_CFG80211_DISASSOC;
1340 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1341 struct ieee80211_mgmt *mgmt, size_t len)
1343 struct ieee80211_sub_if_data *sdata = wk->sdata;
1344 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1345 struct ieee80211_local *local = sdata->local;
1346 struct ieee80211_supported_band *sband;
1347 struct sta_info *sta;
1348 struct cfg80211_bss *cbss = wk->assoc.bss;
1350 u32 rates, basic_rates;
1351 u16 capab_info, aid;
1352 struct ieee802_11_elems elems;
1353 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1356 bool have_higher_than_11mbit = false;
1357 u16 ap_ht_cap_flags;
1359 /* AssocResp and ReassocResp have identical structure */
1361 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1362 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1364 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1365 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1366 "set\n", sdata->name, aid);
1367 aid &= ~(BIT(15) | BIT(14));
1369 pos = mgmt->u.assoc_resp.variable;
1370 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1372 if (!elems.supp_rates) {
1373 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1380 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1382 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1383 " the AP\n", sdata->name);
1387 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1389 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1390 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1394 sband = local->hw.wiphy->bands[wk->chan->band];
1396 for (i = 0; i < elems.supp_rates_len; i++) {
1397 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1398 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1401 have_higher_than_11mbit = true;
1403 for (j = 0; j < sband->n_bitrates; j++) {
1404 if (sband->bitrates[j].bitrate == rate) {
1407 basic_rates |= BIT(j);
1413 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1414 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1415 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1418 have_higher_than_11mbit = true;
1420 for (j = 0; j < sband->n_bitrates; j++) {
1421 if (sband->bitrates[j].bitrate == rate) {
1424 basic_rates |= BIT(j);
1430 sta->sta.supp_rates[wk->chan->band] = rates;
1431 sdata->vif.bss_conf.basic_rates = basic_rates;
1433 /* cf. IEEE 802.11 9.2.12 */
1434 if (wk->chan->band == IEEE80211_BAND_2GHZ &&
1435 have_higher_than_11mbit)
1436 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1438 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1440 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1441 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1442 elems.ht_cap_elem, &sta->sta.ht_cap);
1444 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1446 rate_control_rate_init(sta);
1448 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1449 set_sta_flags(sta, WLAN_STA_MFP);
1451 if (elems.wmm_param)
1452 set_sta_flags(sta, WLAN_STA_WME);
1454 err = sta_info_insert(sta);
1457 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1458 " the AP (error %d)\n", sdata->name, err);
1463 * Always handle WMM once after association regardless
1464 * of the first value the AP uses. Setting -1 here has
1465 * that effect because the AP values is an unsigned
1468 ifmgd->wmm_last_param_set = -1;
1470 if (elems.wmm_param)
1471 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1472 elems.wmm_param_len);
1474 ieee80211_set_wmm_default(sdata);
1476 local->oper_channel = wk->chan;
1478 if (elems.ht_info_elem && elems.wmm_param &&
1479 (sdata->local->hw.queues >= 4) &&
1480 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1481 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1482 cbss->bssid, ap_ht_cap_flags);
1484 /* set AID and assoc capability,
1485 * ieee80211_set_associated() will tell the driver */
1486 bss_conf->aid = aid;
1487 bss_conf->assoc_capability = capab_info;
1488 ieee80211_set_associated(sdata, cbss, changed);
1491 * If we're using 4-addr mode, let the AP know that we're
1492 * doing so, so that it can create the STA VLAN on its side
1494 if (ifmgd->use_4addr)
1495 ieee80211_send_4addr_nullfunc(local, sdata);
1498 * Start timer to probe the connection to the AP now.
1499 * Also start the timer that will detect beacon loss.
1501 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1502 ieee80211_sta_reset_beacon_monitor(sdata);
1508 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1509 struct ieee80211_mgmt *mgmt,
1511 struct ieee80211_rx_status *rx_status,
1512 struct ieee802_11_elems *elems,
1515 struct ieee80211_local *local = sdata->local;
1517 struct ieee80211_bss *bss;
1518 struct ieee80211_channel *channel;
1519 bool need_ps = false;
1521 if (sdata->u.mgd.associated) {
1522 bss = (void *)sdata->u.mgd.associated->priv;
1523 /* not previously set so we may need to recalc */
1524 need_ps = !bss->dtim_period;
1527 if (elems->ds_params && elems->ds_params_len == 1)
1528 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1530 freq = rx_status->freq;
1532 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1534 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1537 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1540 ieee80211_rx_bss_put(local, bss);
1542 if (!sdata->u.mgd.associated)
1546 mutex_lock(&local->iflist_mtx);
1547 ieee80211_recalc_ps(local, -1);
1548 mutex_unlock(&local->iflist_mtx);
1551 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1552 (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1554 struct ieee80211_channel_sw_ie *sw_elem =
1555 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1556 ieee80211_sta_process_chanswitch(sdata, sw_elem,
1557 bss, rx_status->mactime);
1562 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1563 struct sk_buff *skb)
1565 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1566 struct ieee80211_if_managed *ifmgd;
1567 struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1568 size_t baselen, len = skb->len;
1569 struct ieee802_11_elems elems;
1571 ifmgd = &sdata->u.mgd;
1573 ASSERT_MGD_MTX(ifmgd);
1575 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1576 return; /* ignore ProbeResp to foreign address */
1578 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1582 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1585 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1587 if (ifmgd->associated &&
1588 memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0)
1589 ieee80211_reset_ap_probe(sdata);
1593 * This is the canonical list of information elements we care about,
1594 * the filter code also gives us all changes to the Microsoft OUI
1595 * (00:50:F2) vendor IE which is used for WMM which we need to track.
1597 * We implement beacon filtering in software since that means we can
1598 * avoid processing the frame here and in cfg80211, and userspace
1599 * will not be able to tell whether the hardware supports it or not.
1601 * XXX: This list needs to be dynamic -- userspace needs to be able to
1602 * add items it requires. It also needs to be able to tell us to
1603 * look out for other vendor IEs.
1605 static const u64 care_about_ies =
1606 (1ULL << WLAN_EID_COUNTRY) |
1607 (1ULL << WLAN_EID_ERP_INFO) |
1608 (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1609 (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1610 (1ULL << WLAN_EID_HT_CAPABILITY) |
1611 (1ULL << WLAN_EID_HT_INFORMATION);
1613 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1614 struct ieee80211_mgmt *mgmt,
1616 struct ieee80211_rx_status *rx_status)
1618 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1619 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1621 struct ieee802_11_elems elems;
1622 struct ieee80211_local *local = sdata->local;
1624 bool erp_valid, directed_tim = false;
1629 ASSERT_MGD_MTX(ifmgd);
1631 /* Process beacon from the current BSS */
1632 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1636 if (rx_status->freq != local->hw.conf.channel->center_freq)
1640 * We might have received a number of frames, among them a
1641 * disassoc frame and a beacon...
1643 if (!ifmgd->associated)
1646 bssid = ifmgd->associated->bssid;
1649 * And in theory even frames from a different AP we were just
1650 * associated to a split-second ago!
1652 if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1655 /* Track average RSSI from the Beacon frames of the current AP */
1656 ifmgd->last_beacon_signal = rx_status->signal;
1657 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1658 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1659 ifmgd->ave_beacon_signal = rx_status->signal * 16;
1660 ifmgd->last_cqm_event_signal = 0;
1661 ifmgd->count_beacon_signal = 1;
1663 ifmgd->ave_beacon_signal =
1664 (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1665 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1666 ifmgd->ave_beacon_signal) / 16;
1667 ifmgd->count_beacon_signal++;
1669 if (bss_conf->cqm_rssi_thold &&
1670 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
1671 !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1672 int sig = ifmgd->ave_beacon_signal / 16;
1673 int last_event = ifmgd->last_cqm_event_signal;
1674 int thold = bss_conf->cqm_rssi_thold;
1675 int hyst = bss_conf->cqm_rssi_hyst;
1677 (last_event == 0 || sig < last_event - hyst)) {
1678 ifmgd->last_cqm_event_signal = sig;
1679 ieee80211_cqm_rssi_notify(
1681 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1683 } else if (sig > thold &&
1684 (last_event == 0 || sig > last_event + hyst)) {
1685 ifmgd->last_cqm_event_signal = sig;
1686 ieee80211_cqm_rssi_notify(
1688 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1693 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1694 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1695 if (net_ratelimit()) {
1696 printk(KERN_DEBUG "%s: cancelling probereq poll due "
1697 "to a received beacon\n", sdata->name);
1700 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1701 mutex_lock(&local->iflist_mtx);
1702 ieee80211_recalc_ps(local, -1);
1703 mutex_unlock(&local->iflist_mtx);
1707 * Push the beacon loss detection into the future since
1708 * we are processing a beacon from the AP just now.
1710 ieee80211_sta_reset_beacon_monitor(sdata);
1712 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1713 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1714 len - baselen, &elems,
1715 care_about_ies, ncrc);
1717 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1718 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1721 if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) {
1722 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1725 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1726 elems.wmm_param_len);
1729 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1731 if (local->hw.conf.dynamic_ps_timeout > 0) {
1732 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1733 ieee80211_hw_config(local,
1734 IEEE80211_CONF_CHANGE_PS);
1735 ieee80211_send_nullfunc(local, sdata, 0);
1737 local->pspolling = true;
1740 * Here is assumed that the driver will be
1741 * able to send ps-poll frame and receive a
1742 * response even though power save mode is
1743 * enabled, but some drivers might require
1744 * to disable power save here. This needs
1745 * to be investigated.
1747 ieee80211_send_pspoll(local, sdata);
1752 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
1754 ifmgd->beacon_crc = ncrc;
1755 ifmgd->beacon_crc_valid = true;
1757 if (elems.erp_info && elems.erp_info_len >= 1) {
1759 erp_value = elems.erp_info[0];
1763 changed |= ieee80211_handle_bss_capability(sdata,
1764 le16_to_cpu(mgmt->u.beacon.capab_info),
1765 erp_valid, erp_value);
1768 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1769 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1770 struct sta_info *sta;
1771 struct ieee80211_supported_band *sband;
1772 u16 ap_ht_cap_flags;
1776 sta = sta_info_get(sdata, bssid);
1777 if (WARN_ON(!sta)) {
1782 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1784 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1785 elems.ht_cap_elem, &sta->sta.ht_cap);
1787 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1791 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1792 bssid, ap_ht_cap_flags);
1795 /* Note: country IE parsing is done for us by cfg80211 */
1796 if (elems.country_elem) {
1797 /* TODO: IBSS also needs this */
1798 if (elems.pwr_constr_elem)
1799 ieee80211_handle_pwr_constr(sdata,
1800 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1801 elems.pwr_constr_elem,
1802 elems.pwr_constr_elem_len);
1805 ieee80211_bss_info_change_notify(sdata, changed);
1808 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1809 struct sk_buff *skb)
1811 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1812 struct ieee80211_rx_status *rx_status;
1813 struct ieee80211_mgmt *mgmt;
1814 enum rx_mgmt_action rma = RX_MGMT_NONE;
1817 rx_status = (struct ieee80211_rx_status *) skb->cb;
1818 mgmt = (struct ieee80211_mgmt *) skb->data;
1819 fc = le16_to_cpu(mgmt->frame_control);
1821 mutex_lock(&ifmgd->mtx);
1823 if (ifmgd->associated &&
1824 memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1825 switch (fc & IEEE80211_FCTL_STYPE) {
1826 case IEEE80211_STYPE_BEACON:
1827 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1830 case IEEE80211_STYPE_PROBE_RESP:
1831 ieee80211_rx_mgmt_probe_resp(sdata, skb);
1833 case IEEE80211_STYPE_DEAUTH:
1834 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1836 case IEEE80211_STYPE_DISASSOC:
1837 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1839 case IEEE80211_STYPE_ACTION:
1840 switch (mgmt->u.action.category) {
1841 case WLAN_CATEGORY_SPECTRUM_MGMT:
1842 ieee80211_sta_process_chanswitch(sdata,
1843 &mgmt->u.action.u.chan_switch.sw_elem,
1844 (void *)ifmgd->associated->priv,
1845 rx_status->mactime);
1849 mutex_unlock(&ifmgd->mtx);
1855 case RX_MGMT_CFG80211_DEAUTH:
1856 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1858 case RX_MGMT_CFG80211_DISASSOC:
1859 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1862 WARN(1, "unexpected: %d", rma);
1867 mutex_unlock(&ifmgd->mtx);
1869 if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1870 (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) {
1871 struct ieee80211_local *local = sdata->local;
1872 struct ieee80211_work *wk;
1874 mutex_lock(&local->mtx);
1875 list_for_each_entry(wk, &local->work_list, list) {
1876 if (wk->sdata != sdata)
1879 if (wk->type != IEEE80211_WORK_ASSOC &&
1880 wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
1883 if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN))
1885 if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN))
1889 * Printing the message only here means we can't
1890 * spuriously print it, but it also means that it
1891 * won't be printed when the frame comes in before
1892 * we even tried to associate or in similar cases.
1894 * Ultimately, I suspect cfg80211 should print the
1898 "%s: deauthenticated from %pM (Reason: %u)\n",
1899 sdata->name, mgmt->bssid,
1900 le16_to_cpu(mgmt->u.deauth.reason_code));
1902 list_del_rcu(&wk->list);
1906 mutex_unlock(&local->mtx);
1908 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1912 static void ieee80211_sta_timer(unsigned long data)
1914 struct ieee80211_sub_if_data *sdata =
1915 (struct ieee80211_sub_if_data *) data;
1916 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1917 struct ieee80211_local *local = sdata->local;
1919 if (local->quiescing) {
1920 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1924 ieee80211_queue_work(&local->hw, &sdata->work);
1927 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
1930 struct ieee80211_local *local = sdata->local;
1931 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1933 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1934 IEEE80211_STA_BEACON_POLL);
1936 ieee80211_set_disassoc(sdata, true, true);
1937 mutex_unlock(&ifmgd->mtx);
1938 mutex_lock(&local->mtx);
1939 ieee80211_recalc_idle(local);
1940 mutex_unlock(&local->mtx);
1942 * must be outside lock due to cfg80211,
1943 * but that's not a problem.
1945 ieee80211_send_deauth_disassoc(sdata, bssid,
1946 IEEE80211_STYPE_DEAUTH,
1947 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1949 mutex_lock(&ifmgd->mtx);
1952 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
1954 struct ieee80211_local *local = sdata->local;
1955 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1957 /* then process the rest of the work */
1958 mutex_lock(&ifmgd->mtx);
1960 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1961 IEEE80211_STA_CONNECTION_POLL) &&
1962 ifmgd->associated) {
1966 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1968 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
1969 max_tries = IEEE80211_MAX_NULLFUNC_TRIES;
1971 max_tries = IEEE80211_MAX_PROBE_TRIES;
1973 /* ACK received for nullfunc probing frame */
1974 if (!ifmgd->probe_send_count)
1975 ieee80211_reset_ap_probe(sdata);
1976 else if (ifmgd->nullfunc_failed) {
1977 if (ifmgd->probe_send_count < max_tries) {
1978 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1979 wiphy_debug(local->hw.wiphy,
1980 "%s: No ack for nullfunc frame to"
1981 " AP %pM, try %d\n",
1983 ifmgd->probe_send_count);
1985 ieee80211_mgd_probe_ap_send(sdata);
1987 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1988 wiphy_debug(local->hw.wiphy,
1989 "%s: No ack for nullfunc frame to"
1990 " AP %pM, disconnecting.\n",
1991 sdata->name, bssid);
1993 ieee80211_sta_connection_lost(sdata, bssid);
1995 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
1996 run_again(ifmgd, ifmgd->probe_timeout);
1997 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1998 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1999 wiphy_debug(local->hw.wiphy,
2000 "%s: Failed to send nullfunc to AP %pM"
2001 " after %dms, disconnecting.\n",
2003 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
2005 ieee80211_sta_connection_lost(sdata, bssid);
2006 } else if (ifmgd->probe_send_count < max_tries) {
2007 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2008 wiphy_debug(local->hw.wiphy,
2009 "%s: No probe response from AP %pM"
2010 " after %dms, try %d\n",
2012 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ,
2013 ifmgd->probe_send_count);
2015 ieee80211_mgd_probe_ap_send(sdata);
2018 * We actually lost the connection ... or did we?
2021 wiphy_debug(local->hw.wiphy,
2022 "%s: No probe response from AP %pM"
2023 " after %dms, disconnecting.\n",
2025 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
2027 ieee80211_sta_connection_lost(sdata, bssid);
2031 mutex_unlock(&ifmgd->mtx);
2034 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2036 struct ieee80211_sub_if_data *sdata =
2037 (struct ieee80211_sub_if_data *) data;
2038 struct ieee80211_local *local = sdata->local;
2040 if (local->quiescing)
2043 ieee80211_queue_work(&sdata->local->hw,
2044 &sdata->u.mgd.beacon_connection_loss_work);
2047 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2049 struct ieee80211_sub_if_data *sdata =
2050 (struct ieee80211_sub_if_data *) data;
2051 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2052 struct ieee80211_local *local = sdata->local;
2054 if (local->quiescing)
2057 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2060 static void ieee80211_sta_monitor_work(struct work_struct *work)
2062 struct ieee80211_sub_if_data *sdata =
2063 container_of(work, struct ieee80211_sub_if_data,
2064 u.mgd.monitor_work);
2066 ieee80211_mgd_probe_ap(sdata, false);
2069 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2071 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2072 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
2073 IEEE80211_STA_CONNECTION_POLL);
2075 /* let's probe the connection once */
2076 ieee80211_queue_work(&sdata->local->hw,
2077 &sdata->u.mgd.monitor_work);
2078 /* and do all the other regular work too */
2079 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2084 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2086 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2089 * we need to use atomic bitops for the running bits
2090 * only because both timers might fire at the same
2091 * time -- the code here is properly synchronised.
2094 cancel_work_sync(&ifmgd->request_smps_work);
2096 cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2097 if (del_timer_sync(&ifmgd->timer))
2098 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2100 cancel_work_sync(&ifmgd->chswitch_work);
2101 if (del_timer_sync(&ifmgd->chswitch_timer))
2102 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2104 cancel_work_sync(&ifmgd->monitor_work);
2105 /* these will just be re-established on connection */
2106 del_timer_sync(&ifmgd->conn_mon_timer);
2107 del_timer_sync(&ifmgd->bcn_mon_timer);
2110 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2112 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2114 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2115 add_timer(&ifmgd->timer);
2116 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2117 add_timer(&ifmgd->chswitch_timer);
2118 ieee80211_sta_reset_beacon_monitor(sdata);
2119 ieee80211_restart_sta_timer(sdata);
2123 /* interface setup */
2124 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2126 struct ieee80211_if_managed *ifmgd;
2128 ifmgd = &sdata->u.mgd;
2129 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2130 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2131 INIT_WORK(&ifmgd->beacon_connection_loss_work,
2132 ieee80211_beacon_connection_loss_work);
2133 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
2134 setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2135 (unsigned long) sdata);
2136 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2137 (unsigned long) sdata);
2138 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2139 (unsigned long) sdata);
2140 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2141 (unsigned long) sdata);
2145 mutex_init(&ifmgd->mtx);
2147 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
2148 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
2150 ifmgd->req_smps = IEEE80211_SMPS_OFF;
2153 /* scan finished notification */
2154 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2156 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2158 /* Restart STA timers */
2160 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2161 ieee80211_restart_sta_timer(sdata);
2165 int ieee80211_max_network_latency(struct notifier_block *nb,
2166 unsigned long data, void *dummy)
2168 s32 latency_usec = (s32) data;
2169 struct ieee80211_local *local =
2170 container_of(nb, struct ieee80211_local,
2171 network_latency_notifier);
2173 mutex_lock(&local->iflist_mtx);
2174 ieee80211_recalc_ps(local, latency_usec);
2175 mutex_unlock(&local->iflist_mtx);
2181 static enum work_done_result
2182 ieee80211_probe_auth_done(struct ieee80211_work *wk,
2183 struct sk_buff *skb)
2186 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
2187 return WORK_DONE_DESTROY;
2190 if (wk->type == IEEE80211_WORK_AUTH) {
2191 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
2192 return WORK_DONE_DESTROY;
2195 mutex_lock(&wk->sdata->u.mgd.mtx);
2196 ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
2197 mutex_unlock(&wk->sdata->u.mgd.mtx);
2199 wk->type = IEEE80211_WORK_AUTH;
2200 wk->probe_auth.tries = 0;
2201 return WORK_DONE_REQUEUE;
2204 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2205 struct cfg80211_auth_request *req)
2208 struct ieee80211_work *wk;
2211 if (req->local_state_change)
2212 return 0; /* no need to update mac80211 state */
2214 switch (req->auth_type) {
2215 case NL80211_AUTHTYPE_OPEN_SYSTEM:
2216 auth_alg = WLAN_AUTH_OPEN;
2218 case NL80211_AUTHTYPE_SHARED_KEY:
2219 if (IS_ERR(sdata->local->wep_tx_tfm))
2221 auth_alg = WLAN_AUTH_SHARED_KEY;
2223 case NL80211_AUTHTYPE_FT:
2224 auth_alg = WLAN_AUTH_FT;
2226 case NL80211_AUTHTYPE_NETWORK_EAP:
2227 auth_alg = WLAN_AUTH_LEAP;
2233 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2237 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2239 if (req->ie && req->ie_len) {
2240 memcpy(wk->ie, req->ie, req->ie_len);
2241 wk->ie_len = req->ie_len;
2244 if (req->key && req->key_len) {
2245 wk->probe_auth.key_len = req->key_len;
2246 wk->probe_auth.key_idx = req->key_idx;
2247 memcpy(wk->probe_auth.key, req->key, req->key_len);
2250 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2251 memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
2252 wk->probe_auth.ssid_len = ssid[1];
2254 wk->probe_auth.algorithm = auth_alg;
2255 wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
2257 /* if we already have a probe, don't probe again */
2258 if (req->bss->proberesp_ies)
2259 wk->type = IEEE80211_WORK_AUTH;
2261 wk->type = IEEE80211_WORK_DIRECT_PROBE;
2262 wk->chan = req->bss->channel;
2264 wk->done = ieee80211_probe_auth_done;
2266 ieee80211_add_work(wk);
2270 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
2271 struct sk_buff *skb)
2273 struct ieee80211_mgmt *mgmt;
2274 struct ieee80211_rx_status *rx_status;
2275 struct ieee802_11_elems elems;
2279 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
2280 return WORK_DONE_DESTROY;
2283 if (wk->type == IEEE80211_WORK_ASSOC_BEACON_WAIT) {
2284 mutex_lock(&wk->sdata->u.mgd.mtx);
2285 rx_status = (void *) skb->cb;
2286 ieee802_11_parse_elems(skb->data + 24 + 12, skb->len - 24 - 12, &elems);
2287 ieee80211_rx_bss_info(wk->sdata, (void *)skb->data, skb->len, rx_status,
2289 mutex_unlock(&wk->sdata->u.mgd.mtx);
2291 wk->type = IEEE80211_WORK_ASSOC;
2292 /* not really done yet */
2293 return WORK_DONE_REQUEUE;
2296 mgmt = (void *)skb->data;
2297 status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2299 if (status == WLAN_STATUS_SUCCESS) {
2300 mutex_lock(&wk->sdata->u.mgd.mtx);
2301 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
2302 mutex_unlock(&wk->sdata->u.mgd.mtx);
2303 /* oops -- internal error -- send timeout for now */
2304 cfg80211_send_assoc_timeout(wk->sdata->dev,
2306 return WORK_DONE_DESTROY;
2309 mutex_unlock(&wk->sdata->u.mgd.mtx);
2312 cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2313 return WORK_DONE_DESTROY;
2316 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2317 struct cfg80211_assoc_request *req)
2319 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2320 struct ieee80211_bss *bss = (void *)req->bss->priv;
2321 struct ieee80211_work *wk;
2325 mutex_lock(&ifmgd->mtx);
2326 if (ifmgd->associated) {
2327 if (!req->prev_bssid ||
2328 memcmp(req->prev_bssid, ifmgd->associated->bssid,
2331 * We are already associated and the request was not a
2332 * reassociation request from the current BSS, so
2335 mutex_unlock(&ifmgd->mtx);
2339 /* Trying to reassociate - clear previous association state */
2340 ieee80211_set_disassoc(sdata, true, false);
2342 mutex_unlock(&ifmgd->mtx);
2344 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2348 ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2349 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2351 ifmgd->beacon_crc_valid = false;
2353 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2354 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2355 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2356 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2357 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2360 if (req->ie && req->ie_len) {
2361 memcpy(wk->ie, req->ie, req->ie_len);
2362 wk->ie_len = req->ie_len;
2366 wk->assoc.bss = req->bss;
2368 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2370 /* new association always uses requested smps mode */
2371 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2372 if (ifmgd->powersave)
2373 ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2375 ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2377 ifmgd->ap_smps = ifmgd->req_smps;
2379 wk->assoc.smps = ifmgd->ap_smps;
2381 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2382 * We still associate in non-HT mode (11a/b/g) if any one of these
2383 * ciphers is configured as pairwise.
2384 * We can set this to true for non-11n hardware, that'll be checked
2385 * separately along with the peer capabilities.
2387 wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2388 wk->assoc.capability = req->bss->capability;
2389 wk->assoc.wmm_used = bss->wmm_used;
2390 wk->assoc.supp_rates = bss->supp_rates;
2391 wk->assoc.supp_rates_len = bss->supp_rates_len;
2392 wk->assoc.ht_information_ie =
2393 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2395 if (bss->wmm_used && bss->uapsd_supported &&
2396 (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2397 wk->assoc.uapsd_used = true;
2398 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2400 wk->assoc.uapsd_used = false;
2401 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2404 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2405 memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2406 wk->assoc.ssid_len = ssid[1];
2408 if (req->prev_bssid)
2409 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2411 wk->chan = req->bss->channel;
2413 wk->done = ieee80211_assoc_done;
2414 if (!bss->dtim_period &&
2415 sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
2416 wk->type = IEEE80211_WORK_ASSOC_BEACON_WAIT;
2418 wk->type = IEEE80211_WORK_ASSOC;
2421 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2422 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2424 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2425 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2428 if (req->crypto.control_port)
2429 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2431 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2433 sdata->control_port_protocol = req->crypto.control_port_ethertype;
2434 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
2436 ieee80211_add_work(wk);
2440 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2441 struct cfg80211_deauth_request *req,
2444 struct ieee80211_local *local = sdata->local;
2445 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2446 struct ieee80211_work *wk;
2448 bool assoc_bss = false;
2450 mutex_lock(&ifmgd->mtx);
2452 memcpy(bssid, req->bss->bssid, ETH_ALEN);
2453 if (ifmgd->associated == req->bss) {
2454 ieee80211_set_disassoc(sdata, false, true);
2455 mutex_unlock(&ifmgd->mtx);
2458 bool not_auth_yet = false;
2460 mutex_unlock(&ifmgd->mtx);
2462 mutex_lock(&local->mtx);
2463 list_for_each_entry(wk, &local->work_list, list) {
2464 if (wk->sdata != sdata)
2467 if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2468 wk->type != IEEE80211_WORK_AUTH &&
2469 wk->type != IEEE80211_WORK_ASSOC &&
2470 wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
2473 if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2476 not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2477 list_del_rcu(&wk->list);
2481 mutex_unlock(&local->mtx);
2484 * If somebody requests authentication and we haven't
2485 * sent out an auth frame yet there's no need to send
2486 * out a deauth frame either. If the state was PROBE,
2487 * then this is the case. If it's AUTH we have sent a
2488 * frame, and if it's IDLE we have completed the auth
2492 __cfg80211_auth_canceled(sdata->dev, bssid);
2497 printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2498 sdata->name, bssid, req->reason_code);
2500 ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2501 req->reason_code, cookie,
2502 !req->local_state_change);
2504 sta_info_destroy_addr(sdata, bssid);
2506 mutex_lock(&sdata->local->mtx);
2507 ieee80211_recalc_idle(sdata->local);
2508 mutex_unlock(&sdata->local->mtx);
2513 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2514 struct cfg80211_disassoc_request *req,
2517 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2520 mutex_lock(&ifmgd->mtx);
2523 * cfg80211 should catch this ... but it's racy since
2524 * we can receive a disassoc frame, process it, hand it
2525 * to cfg80211 while that's in a locked section already
2526 * trying to tell us that the user wants to disconnect.
2528 if (ifmgd->associated != req->bss) {
2529 mutex_unlock(&ifmgd->mtx);
2533 printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2534 sdata->name, req->bss->bssid, req->reason_code);
2536 memcpy(bssid, req->bss->bssid, ETH_ALEN);
2537 ieee80211_set_disassoc(sdata, false, true);
2539 mutex_unlock(&ifmgd->mtx);
2541 ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2542 IEEE80211_STYPE_DISASSOC, req->reason_code,
2543 cookie, !req->local_state_change);
2544 sta_info_destroy_addr(sdata, bssid);
2546 mutex_lock(&sdata->local->mtx);
2547 ieee80211_recalc_idle(sdata->local);
2548 mutex_unlock(&sdata->local->mtx);
2553 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2554 enum nl80211_cqm_rssi_threshold_event rssi_event,
2557 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2559 trace_api_cqm_rssi_notify(sdata, rssi_event);
2561 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2563 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);