2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
11 * utilities for mac80211
14 #include <net/mac80211.h>
15 #include <linux/netdevice.h>
16 #include <linux/export.h>
17 #include <linux/types.h>
18 #include <linux/slab.h>
19 #include <linux/skbuff.h>
20 #include <linux/etherdevice.h>
21 #include <linux/if_arp.h>
22 #include <linux/bitmap.h>
23 #include <linux/crc32.h>
24 #include <net/net_namespace.h>
25 #include <net/cfg80211.h>
26 #include <net/rtnetlink.h>
28 #include "ieee80211_i.h"
29 #include "driver-ops.h"
36 /* privid for wiphys to determine whether they belong to us or not */
37 void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
39 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
41 struct ieee80211_local *local;
44 local = wiphy_priv(wiphy);
47 EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
49 u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
50 enum nl80211_iftype type)
52 __le16 fc = hdr->frame_control;
54 /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
58 if (ieee80211_is_data(fc)) {
59 if (len < 24) /* drop incorrect hdr len (data) */
62 if (ieee80211_has_a4(fc))
64 if (ieee80211_has_tods(fc))
66 if (ieee80211_has_fromds(fc))
72 if (ieee80211_is_mgmt(fc)) {
73 if (len < 24) /* drop incorrect hdr len (mgmt) */
78 if (ieee80211_is_ctl(fc)) {
79 if(ieee80211_is_pspoll(fc))
82 if (ieee80211_is_back_req(fc)) {
84 case NL80211_IFTYPE_STATION:
86 case NL80211_IFTYPE_AP:
87 case NL80211_IFTYPE_AP_VLAN:
90 break; /* fall through to the return */
98 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
101 struct ieee80211_hdr *hdr;
103 skb_queue_walk(&tx->skbs, skb) {
104 hdr = (struct ieee80211_hdr *) skb->data;
105 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
109 int ieee80211_frame_duration(enum ieee80211_band band, size_t len,
110 int rate, int erp, int short_preamble)
114 /* calculate duration (in microseconds, rounded up to next higher
115 * integer if it includes a fractional microsecond) to send frame of
116 * len bytes (does not include FCS) at the given rate. Duration will
119 * rate is in 100 kbps, so divident is multiplied by 10 in the
120 * DIV_ROUND_UP() operations.
123 if (band == IEEE80211_BAND_5GHZ || erp) {
127 * N_DBPS = DATARATE x 4
128 * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
129 * (16 = SIGNAL time, 6 = tail bits)
130 * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
133 * 802.11a - 17.5.2: aSIFSTime = 16 usec
134 * 802.11g - 19.8.4: aSIFSTime = 10 usec +
135 * signal ext = 6 usec
137 dur = 16; /* SIFS + signal ext */
138 dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
139 dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
140 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
141 4 * rate); /* T_SYM x N_SYM */
144 * 802.11b or 802.11g with 802.11b compatibility:
145 * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
146 * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
148 * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
149 * aSIFSTime = 10 usec
150 * aPreambleLength = 144 usec or 72 usec with short preamble
151 * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
153 dur = 10; /* aSIFSTime = 10 usec */
154 dur += short_preamble ? (72 + 24) : (144 + 48);
156 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
162 /* Exported duration function for driver use */
163 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
164 struct ieee80211_vif *vif,
165 enum ieee80211_band band,
167 struct ieee80211_rate *rate)
169 struct ieee80211_sub_if_data *sdata;
172 bool short_preamble = false;
176 sdata = vif_to_sdata(vif);
177 short_preamble = sdata->vif.bss_conf.use_short_preamble;
178 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
179 erp = rate->flags & IEEE80211_RATE_ERP_G;
182 dur = ieee80211_frame_duration(band, frame_len, rate->bitrate, erp,
185 return cpu_to_le16(dur);
187 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
189 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
190 struct ieee80211_vif *vif, size_t frame_len,
191 const struct ieee80211_tx_info *frame_txctl)
193 struct ieee80211_local *local = hw_to_local(hw);
194 struct ieee80211_rate *rate;
195 struct ieee80211_sub_if_data *sdata;
199 struct ieee80211_supported_band *sband;
201 sband = local->hw.wiphy->bands[frame_txctl->band];
203 short_preamble = false;
205 rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
209 sdata = vif_to_sdata(vif);
210 short_preamble = sdata->vif.bss_conf.use_short_preamble;
211 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
212 erp = rate->flags & IEEE80211_RATE_ERP_G;
216 dur = ieee80211_frame_duration(sband->band, 10, rate->bitrate,
217 erp, short_preamble);
218 /* Data frame duration */
219 dur += ieee80211_frame_duration(sband->band, frame_len, rate->bitrate,
220 erp, short_preamble);
222 dur += ieee80211_frame_duration(sband->band, 10, rate->bitrate,
223 erp, short_preamble);
225 return cpu_to_le16(dur);
227 EXPORT_SYMBOL(ieee80211_rts_duration);
229 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
230 struct ieee80211_vif *vif,
232 const struct ieee80211_tx_info *frame_txctl)
234 struct ieee80211_local *local = hw_to_local(hw);
235 struct ieee80211_rate *rate;
236 struct ieee80211_sub_if_data *sdata;
240 struct ieee80211_supported_band *sband;
242 sband = local->hw.wiphy->bands[frame_txctl->band];
244 short_preamble = false;
246 rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
249 sdata = vif_to_sdata(vif);
250 short_preamble = sdata->vif.bss_conf.use_short_preamble;
251 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
252 erp = rate->flags & IEEE80211_RATE_ERP_G;
255 /* Data frame duration */
256 dur = ieee80211_frame_duration(sband->band, frame_len, rate->bitrate,
257 erp, short_preamble);
258 if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
260 dur += ieee80211_frame_duration(sband->band, 10, rate->bitrate,
261 erp, short_preamble);
264 return cpu_to_le16(dur);
266 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
268 void ieee80211_propagate_queue_wake(struct ieee80211_local *local, int queue)
270 struct ieee80211_sub_if_data *sdata;
271 int n_acs = IEEE80211_NUM_ACS;
273 if (local->hw.queues < IEEE80211_NUM_ACS)
276 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
282 if (test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
285 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE &&
286 local->queue_stop_reasons[sdata->vif.cab_queue] != 0)
289 for (ac = 0; ac < n_acs; ac++) {
290 int ac_queue = sdata->vif.hw_queue[ac];
292 if (ac_queue == queue ||
293 (sdata->vif.cab_queue == queue &&
294 local->queue_stop_reasons[ac_queue] == 0 &&
295 skb_queue_empty(&local->pending[ac_queue])))
296 netif_wake_subqueue(sdata->dev, ac);
301 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
302 enum queue_stop_reason reason)
304 struct ieee80211_local *local = hw_to_local(hw);
306 trace_wake_queue(local, queue, reason);
308 if (WARN_ON(queue >= hw->queues))
311 if (!test_bit(reason, &local->queue_stop_reasons[queue]))
314 __clear_bit(reason, &local->queue_stop_reasons[queue]);
316 if (local->queue_stop_reasons[queue] != 0)
317 /* someone still has this queue stopped */
320 if (skb_queue_empty(&local->pending[queue])) {
322 ieee80211_propagate_queue_wake(local, queue);
325 tasklet_schedule(&local->tx_pending_tasklet);
328 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
329 enum queue_stop_reason reason)
331 struct ieee80211_local *local = hw_to_local(hw);
334 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
335 __ieee80211_wake_queue(hw, queue, reason);
336 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
339 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
341 ieee80211_wake_queue_by_reason(hw, queue,
342 IEEE80211_QUEUE_STOP_REASON_DRIVER);
344 EXPORT_SYMBOL(ieee80211_wake_queue);
346 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
347 enum queue_stop_reason reason)
349 struct ieee80211_local *local = hw_to_local(hw);
350 struct ieee80211_sub_if_data *sdata;
351 int n_acs = IEEE80211_NUM_ACS;
353 trace_stop_queue(local, queue, reason);
355 if (WARN_ON(queue >= hw->queues))
358 if (test_bit(reason, &local->queue_stop_reasons[queue]))
361 __set_bit(reason, &local->queue_stop_reasons[queue]);
363 if (local->hw.queues < IEEE80211_NUM_ACS)
367 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
373 for (ac = 0; ac < n_acs; ac++) {
374 if (sdata->vif.hw_queue[ac] == queue ||
375 sdata->vif.cab_queue == queue)
376 netif_stop_subqueue(sdata->dev, ac);
382 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
383 enum queue_stop_reason reason)
385 struct ieee80211_local *local = hw_to_local(hw);
388 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
389 __ieee80211_stop_queue(hw, queue, reason);
390 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
393 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
395 ieee80211_stop_queue_by_reason(hw, queue,
396 IEEE80211_QUEUE_STOP_REASON_DRIVER);
398 EXPORT_SYMBOL(ieee80211_stop_queue);
400 void ieee80211_add_pending_skb(struct ieee80211_local *local,
403 struct ieee80211_hw *hw = &local->hw;
405 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
406 int queue = info->hw_queue;
408 if (WARN_ON(!info->control.vif)) {
409 ieee80211_free_txskb(&local->hw, skb);
413 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
414 __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
415 __skb_queue_tail(&local->pending[queue], skb);
416 __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
417 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
420 void ieee80211_add_pending_skbs_fn(struct ieee80211_local *local,
421 struct sk_buff_head *skbs,
422 void (*fn)(void *data), void *data)
424 struct ieee80211_hw *hw = &local->hw;
429 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
430 while ((skb = skb_dequeue(skbs))) {
431 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
433 if (WARN_ON(!info->control.vif)) {
434 ieee80211_free_txskb(&local->hw, skb);
438 queue = info->hw_queue;
440 __ieee80211_stop_queue(hw, queue,
441 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
443 __skb_queue_tail(&local->pending[queue], skb);
449 for (i = 0; i < hw->queues; i++)
450 __ieee80211_wake_queue(hw, i,
451 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
452 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
455 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
456 enum queue_stop_reason reason)
458 struct ieee80211_local *local = hw_to_local(hw);
462 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
464 for (i = 0; i < hw->queues; i++)
465 __ieee80211_stop_queue(hw, i, reason);
467 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
470 void ieee80211_stop_queues(struct ieee80211_hw *hw)
472 ieee80211_stop_queues_by_reason(hw,
473 IEEE80211_QUEUE_STOP_REASON_DRIVER);
475 EXPORT_SYMBOL(ieee80211_stop_queues);
477 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
479 struct ieee80211_local *local = hw_to_local(hw);
483 if (WARN_ON(queue >= hw->queues))
486 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
487 ret = !!local->queue_stop_reasons[queue];
488 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
491 EXPORT_SYMBOL(ieee80211_queue_stopped);
493 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
494 enum queue_stop_reason reason)
496 struct ieee80211_local *local = hw_to_local(hw);
500 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
502 for (i = 0; i < hw->queues; i++)
503 __ieee80211_wake_queue(hw, i, reason);
505 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
508 void ieee80211_wake_queues(struct ieee80211_hw *hw)
510 ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
512 EXPORT_SYMBOL(ieee80211_wake_queues);
514 void ieee80211_iterate_active_interfaces(
515 struct ieee80211_hw *hw,
516 void (*iterator)(void *data, u8 *mac,
517 struct ieee80211_vif *vif),
520 struct ieee80211_local *local = hw_to_local(hw);
521 struct ieee80211_sub_if_data *sdata;
523 mutex_lock(&local->iflist_mtx);
525 list_for_each_entry(sdata, &local->interfaces, list) {
526 switch (sdata->vif.type) {
527 case NL80211_IFTYPE_MONITOR:
528 case NL80211_IFTYPE_AP_VLAN:
533 if (ieee80211_sdata_running(sdata))
534 iterator(data, sdata->vif.addr,
538 sdata = rcu_dereference_protected(local->monitor_sdata,
539 lockdep_is_held(&local->iflist_mtx));
541 iterator(data, sdata->vif.addr, &sdata->vif);
543 mutex_unlock(&local->iflist_mtx);
545 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
547 void ieee80211_iterate_active_interfaces_atomic(
548 struct ieee80211_hw *hw,
549 void (*iterator)(void *data, u8 *mac,
550 struct ieee80211_vif *vif),
553 struct ieee80211_local *local = hw_to_local(hw);
554 struct ieee80211_sub_if_data *sdata;
558 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
559 switch (sdata->vif.type) {
560 case NL80211_IFTYPE_MONITOR:
561 case NL80211_IFTYPE_AP_VLAN:
566 if (ieee80211_sdata_running(sdata))
567 iterator(data, sdata->vif.addr,
571 sdata = rcu_dereference(local->monitor_sdata);
573 iterator(data, sdata->vif.addr, &sdata->vif);
577 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
580 * Nothing should have been stuffed into the workqueue during
581 * the suspend->resume cycle. If this WARN is seen then there
582 * is a bug with either the driver suspend or something in
583 * mac80211 stuffing into the workqueue which we haven't yet
584 * cleared during mac80211's suspend cycle.
586 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
588 if (WARN(local->suspended && !local->resuming,
589 "queueing ieee80211 work while going to suspend\n"))
595 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
597 struct ieee80211_local *local = hw_to_local(hw);
599 if (!ieee80211_can_queue_work(local))
602 queue_work(local->workqueue, work);
604 EXPORT_SYMBOL(ieee80211_queue_work);
606 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
607 struct delayed_work *dwork,
610 struct ieee80211_local *local = hw_to_local(hw);
612 if (!ieee80211_can_queue_work(local))
615 queue_delayed_work(local->workqueue, dwork, delay);
617 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
619 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
620 struct ieee802_11_elems *elems,
625 bool calc_crc = filter != 0;
626 DECLARE_BITMAP(seen_elems, 256);
628 bitmap_zero(seen_elems, 256);
629 memset(elems, 0, sizeof(*elems));
630 elems->ie_start = start;
631 elems->total_len = len;
635 bool elem_parse_failed;
642 elems->parse_error = true;
646 if (id != WLAN_EID_VENDOR_SPECIFIC &&
647 id != WLAN_EID_QUIET &&
648 test_bit(id, seen_elems)) {
649 elems->parse_error = true;
655 if (calc_crc && id < 64 && (filter & (1ULL << id)))
656 crc = crc32_be(crc, pos - 2, elen + 2);
658 elem_parse_failed = false;
663 elems->ssid_len = elen;
665 case WLAN_EID_SUPP_RATES:
666 elems->supp_rates = pos;
667 elems->supp_rates_len = elen;
669 case WLAN_EID_FH_PARAMS:
670 elems->fh_params = pos;
671 elems->fh_params_len = elen;
673 case WLAN_EID_DS_PARAMS:
674 elems->ds_params = pos;
675 elems->ds_params_len = elen;
677 case WLAN_EID_CF_PARAMS:
678 elems->cf_params = pos;
679 elems->cf_params_len = elen;
682 if (elen >= sizeof(struct ieee80211_tim_ie)) {
683 elems->tim = (void *)pos;
684 elems->tim_len = elen;
686 elem_parse_failed = true;
688 case WLAN_EID_IBSS_PARAMS:
689 elems->ibss_params = pos;
690 elems->ibss_params_len = elen;
692 case WLAN_EID_CHALLENGE:
693 elems->challenge = pos;
694 elems->challenge_len = elen;
696 case WLAN_EID_VENDOR_SPECIFIC:
697 if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
699 /* Microsoft OUI (00:50:F2) */
702 crc = crc32_be(crc, pos - 2, elen + 2);
705 /* OUI Type 1 - WPA IE */
707 elems->wpa_len = elen;
708 } else if (elen >= 5 && pos[3] == 2) {
709 /* OUI Type 2 - WMM IE */
711 elems->wmm_info = pos;
712 elems->wmm_info_len = elen;
713 } else if (pos[4] == 1) {
714 elems->wmm_param = pos;
715 elems->wmm_param_len = elen;
722 elems->rsn_len = elen;
724 case WLAN_EID_ERP_INFO:
725 elems->erp_info = pos;
726 elems->erp_info_len = elen;
728 case WLAN_EID_EXT_SUPP_RATES:
729 elems->ext_supp_rates = pos;
730 elems->ext_supp_rates_len = elen;
732 case WLAN_EID_HT_CAPABILITY:
733 if (elen >= sizeof(struct ieee80211_ht_cap))
734 elems->ht_cap_elem = (void *)pos;
736 elem_parse_failed = true;
738 case WLAN_EID_HT_OPERATION:
739 if (elen >= sizeof(struct ieee80211_ht_operation))
740 elems->ht_operation = (void *)pos;
742 elem_parse_failed = true;
744 case WLAN_EID_MESH_ID:
745 elems->mesh_id = pos;
746 elems->mesh_id_len = elen;
748 case WLAN_EID_MESH_CONFIG:
749 if (elen >= sizeof(struct ieee80211_meshconf_ie))
750 elems->mesh_config = (void *)pos;
752 elem_parse_failed = true;
754 case WLAN_EID_PEER_MGMT:
755 elems->peering = pos;
756 elems->peering_len = elen;
760 elems->preq_len = elen;
764 elems->prep_len = elen;
768 elems->perr_len = elen;
771 if (elen >= sizeof(struct ieee80211_rann_ie))
772 elems->rann = (void *)pos;
774 elem_parse_failed = true;
776 case WLAN_EID_CHANNEL_SWITCH:
777 if (elen != sizeof(struct ieee80211_channel_sw_ie)) {
778 elem_parse_failed = true;
781 elems->ch_switch_ie = (void *)pos;
784 if (!elems->quiet_elem) {
785 elems->quiet_elem = pos;
786 elems->quiet_elem_len = elen;
788 elems->num_of_quiet_elem++;
790 case WLAN_EID_COUNTRY:
791 elems->country_elem = pos;
792 elems->country_elem_len = elen;
794 case WLAN_EID_PWR_CONSTRAINT:
796 elem_parse_failed = true;
799 elems->pwr_constr_elem = pos;
801 case WLAN_EID_TIMEOUT_INTERVAL:
802 elems->timeout_int = pos;
803 elems->timeout_int_len = elen;
809 if (elem_parse_failed)
810 elems->parse_error = true;
812 set_bit(id, seen_elems);
819 elems->parse_error = true;
824 void ieee802_11_parse_elems(u8 *start, size_t len,
825 struct ieee802_11_elems *elems)
827 ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
830 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
833 struct ieee80211_local *local = sdata->local;
834 struct ieee80211_tx_queue_params qparam;
836 bool use_11b, enable_qos;
839 if (!local->ops->conf_tx)
842 if (local->hw.queues < IEEE80211_NUM_ACS)
845 memset(&qparam, 0, sizeof(qparam));
847 use_11b = (local->oper_channel->band == IEEE80211_BAND_2GHZ) &&
848 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
851 * By default disable QoS in STA mode for old access points, which do
852 * not support 802.11e. New APs will provide proper queue parameters,
853 * that we will configure later.
855 enable_qos = (sdata->vif.type != NL80211_IFTYPE_STATION);
857 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
858 /* Set defaults according to 802.11-2007 Table 7-37 */
867 case IEEE80211_AC_BK:
868 qparam.cw_max = aCWmax;
869 qparam.cw_min = aCWmin;
873 /* never happens but let's not leave undefined */
875 case IEEE80211_AC_BE:
876 qparam.cw_max = aCWmax;
877 qparam.cw_min = aCWmin;
881 case IEEE80211_AC_VI:
882 qparam.cw_max = aCWmin;
883 qparam.cw_min = (aCWmin + 1) / 2 - 1;
885 qparam.txop = 6016/32;
887 qparam.txop = 3008/32;
890 case IEEE80211_AC_VO:
891 qparam.cw_max = (aCWmin + 1) / 2 - 1;
892 qparam.cw_min = (aCWmin + 1) / 4 - 1;
894 qparam.txop = 3264/32;
896 qparam.txop = 1504/32;
901 /* Confiure old 802.11b/g medium access rules. */
902 qparam.cw_max = aCWmax;
903 qparam.cw_min = aCWmin;
908 qparam.uapsd = false;
910 sdata->tx_conf[ac] = qparam;
911 drv_conf_tx(local, sdata, ac, &qparam);
914 if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
915 sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
916 sdata->vif.bss_conf.qos = enable_qos;
918 ieee80211_bss_info_change_notify(sdata,
923 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
924 const size_t supp_rates_len,
925 const u8 *supp_rates)
927 struct ieee80211_local *local = sdata->local;
928 int i, have_higher_than_11mbit = 0;
930 /* cf. IEEE 802.11 9.2.12 */
931 for (i = 0; i < supp_rates_len; i++)
932 if ((supp_rates[i] & 0x7f) * 5 > 110)
933 have_higher_than_11mbit = 1;
935 if (local->oper_channel->band == IEEE80211_BAND_2GHZ &&
936 have_higher_than_11mbit)
937 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
939 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
941 ieee80211_set_wmm_default(sdata, true);
944 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
945 enum ieee80211_band band)
947 struct ieee80211_supported_band *sband;
948 struct ieee80211_rate *bitrates;
950 enum ieee80211_rate_flags mandatory_flag;
953 sband = local->hw.wiphy->bands[band];
957 if (band == IEEE80211_BAND_2GHZ)
958 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
960 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
962 bitrates = sband->bitrates;
964 for (i = 0; i < sband->n_bitrates; i++)
965 if (bitrates[i].flags & mandatory_flag)
966 mandatory_rates |= BIT(i);
967 return mandatory_rates;
970 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
971 u16 transaction, u16 auth_alg,
972 u8 *extra, size_t extra_len, const u8 *da,
973 const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx)
975 struct ieee80211_local *local = sdata->local;
977 struct ieee80211_mgmt *mgmt;
980 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
981 sizeof(*mgmt) + 6 + extra_len);
985 skb_reserve(skb, local->hw.extra_tx_headroom);
987 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
988 memset(mgmt, 0, 24 + 6);
989 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
990 IEEE80211_STYPE_AUTH);
991 memcpy(mgmt->da, da, ETH_ALEN);
992 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
993 memcpy(mgmt->bssid, bssid, ETH_ALEN);
994 mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
995 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
996 mgmt->u.auth.status_code = cpu_to_le16(0);
998 memcpy(skb_put(skb, extra_len), extra, extra_len);
1000 if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
1001 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
1002 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
1006 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1007 ieee80211_tx_skb(sdata, skb);
1010 void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
1011 const u8 *bssid, u16 stype, u16 reason,
1012 bool send_frame, u8 *frame_buf)
1014 struct ieee80211_local *local = sdata->local;
1015 struct sk_buff *skb;
1016 struct ieee80211_mgmt *mgmt = (void *)frame_buf;
1019 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
1020 mgmt->duration = 0; /* initialize only */
1021 mgmt->seq_ctrl = 0; /* initialize only */
1022 memcpy(mgmt->da, bssid, ETH_ALEN);
1023 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1024 memcpy(mgmt->bssid, bssid, ETH_ALEN);
1025 /* u.deauth.reason_code == u.disassoc.reason_code */
1026 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
1029 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
1030 IEEE80211_DEAUTH_FRAME_LEN);
1034 skb_reserve(skb, local->hw.extra_tx_headroom);
1037 memcpy(skb_put(skb, IEEE80211_DEAUTH_FRAME_LEN),
1038 mgmt, IEEE80211_DEAUTH_FRAME_LEN);
1040 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1041 !(sdata->u.mgd.flags & IEEE80211_STA_MFP_ENABLED))
1042 IEEE80211_SKB_CB(skb)->flags |=
1043 IEEE80211_TX_INTFL_DONT_ENCRYPT;
1045 ieee80211_tx_skb(sdata, skb);
1049 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
1050 const u8 *ie, size_t ie_len,
1051 enum ieee80211_band band, u32 rate_mask,
1054 struct ieee80211_supported_band *sband;
1056 size_t offset = 0, noffset;
1057 int supp_rates_len, i;
1062 sband = local->hw.wiphy->bands[band];
1063 if (WARN_ON_ONCE(!sband))
1069 for (i = 0; i < sband->n_bitrates; i++) {
1070 if ((BIT(i) & rate_mask) == 0)
1071 continue; /* skip rate */
1072 rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
1075 supp_rates_len = min_t(int, num_rates, 8);
1077 *pos++ = WLAN_EID_SUPP_RATES;
1078 *pos++ = supp_rates_len;
1079 memcpy(pos, rates, supp_rates_len);
1080 pos += supp_rates_len;
1082 /* insert "request information" if in custom IEs */
1084 static const u8 before_extrates[] = {
1086 WLAN_EID_SUPP_RATES,
1089 noffset = ieee80211_ie_split(ie, ie_len,
1091 ARRAY_SIZE(before_extrates),
1093 memcpy(pos, ie + offset, noffset - offset);
1094 pos += noffset - offset;
1098 ext_rates_len = num_rates - supp_rates_len;
1099 if (ext_rates_len > 0) {
1100 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1101 *pos++ = ext_rates_len;
1102 memcpy(pos, rates + supp_rates_len, ext_rates_len);
1103 pos += ext_rates_len;
1106 if (channel && sband->band == IEEE80211_BAND_2GHZ) {
1107 *pos++ = WLAN_EID_DS_PARAMS;
1112 /* insert custom IEs that go before HT */
1114 static const u8 before_ht[] = {
1116 WLAN_EID_SUPP_RATES,
1118 WLAN_EID_EXT_SUPP_RATES,
1120 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1122 noffset = ieee80211_ie_split(ie, ie_len,
1123 before_ht, ARRAY_SIZE(before_ht),
1125 memcpy(pos, ie + offset, noffset - offset);
1126 pos += noffset - offset;
1130 if (sband->ht_cap.ht_supported)
1131 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1135 * If adding more here, adjust code in main.c
1136 * that calculates local->scan_ies_len.
1139 /* add any remaining custom IEs */
1142 memcpy(pos, ie + offset, noffset - offset);
1143 pos += noffset - offset;
1146 if (sband->vht_cap.vht_supported)
1147 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
1148 sband->vht_cap.cap);
1150 return pos - buffer;
1153 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1154 u8 *dst, u32 ratemask,
1155 struct ieee80211_channel *chan,
1156 const u8 *ssid, size_t ssid_len,
1157 const u8 *ie, size_t ie_len,
1160 struct ieee80211_local *local = sdata->local;
1161 struct sk_buff *skb;
1162 struct ieee80211_mgmt *mgmt;
1167 /* FIXME: come up with a proper value */
1168 buf = kmalloc(200 + ie_len, GFP_KERNEL);
1173 * Do not send DS Channel parameter for directed probe requests
1174 * in order to maximize the chance that we get a response. Some
1175 * badly-behaved APs don't respond when this parameter is included.
1180 chan_no = ieee80211_frequency_to_channel(chan->center_freq);
1182 buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len, chan->band,
1185 skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1192 mgmt = (struct ieee80211_mgmt *) skb->data;
1193 memcpy(mgmt->da, dst, ETH_ALEN);
1194 memcpy(mgmt->bssid, dst, ETH_ALEN);
1197 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1205 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1206 const u8 *ssid, size_t ssid_len,
1207 const u8 *ie, size_t ie_len,
1208 u32 ratemask, bool directed, bool no_cck,
1209 struct ieee80211_channel *channel)
1211 struct sk_buff *skb;
1213 skb = ieee80211_build_probe_req(sdata, dst, ratemask, channel,
1215 ie, ie_len, directed);
1218 IEEE80211_SKB_CB(skb)->flags |=
1219 IEEE80211_TX_CTL_NO_CCK_RATE;
1220 ieee80211_tx_skb(sdata, skb);
1224 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1225 struct ieee802_11_elems *elems,
1226 enum ieee80211_band band, u32 *basic_rates)
1228 struct ieee80211_supported_band *sband;
1229 struct ieee80211_rate *bitrates;
1233 sband = local->hw.wiphy->bands[band];
1235 if (WARN_ON(!sband))
1238 bitrates = sband->bitrates;
1239 num_rates = sband->n_bitrates;
1241 for (i = 0; i < elems->supp_rates_len +
1242 elems->ext_supp_rates_len; i++) {
1246 if (i < elems->supp_rates_len)
1247 rate = elems->supp_rates[i];
1248 else if (elems->ext_supp_rates)
1249 rate = elems->ext_supp_rates
1250 [i - elems->supp_rates_len];
1251 own_rate = 5 * (rate & 0x7f);
1252 is_basic = !!(rate & 0x80);
1254 if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1257 for (j = 0; j < num_rates; j++) {
1258 if (bitrates[j].bitrate == own_rate) {
1259 supp_rates |= BIT(j);
1260 if (basic_rates && is_basic)
1261 *basic_rates |= BIT(j);
1268 void ieee80211_stop_device(struct ieee80211_local *local)
1270 ieee80211_led_radio(local, false);
1271 ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1273 cancel_work_sync(&local->reconfig_filter);
1275 flush_workqueue(local->workqueue);
1279 int ieee80211_reconfig(struct ieee80211_local *local)
1281 struct ieee80211_hw *hw = &local->hw;
1282 struct ieee80211_sub_if_data *sdata;
1283 struct sta_info *sta;
1287 if (local->suspended)
1288 local->resuming = true;
1290 if (local->wowlan) {
1291 local->wowlan = false;
1292 res = drv_resume(local);
1294 local->resuming = false;
1301 * res is 1, which means the driver requested
1302 * to go through a regular reset on wakeup.
1306 /* everything else happens only if HW was up & running */
1307 if (!local->open_count)
1311 * Upon resume hardware can sometimes be goofy due to
1312 * various platform / driver / bus issues, so restarting
1313 * the device may at times not work immediately. Propagate
1316 res = drv_start(local);
1318 WARN(local->suspended, "Hardware became unavailable "
1319 "upon resume. This could be a software issue "
1320 "prior to suspend or a hardware issue.\n");
1324 /* setup fragmentation threshold */
1325 drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1327 /* setup RTS threshold */
1328 drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1330 /* reset coverage class */
1331 drv_set_coverage_class(local, hw->wiphy->coverage_class);
1333 ieee80211_led_radio(local, true);
1334 ieee80211_mod_tpt_led_trig(local,
1335 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1337 /* add interfaces */
1338 sdata = rtnl_dereference(local->monitor_sdata);
1340 res = drv_add_interface(local, sdata);
1342 rcu_assign_pointer(local->monitor_sdata, NULL);
1348 list_for_each_entry(sdata, &local->interfaces, list) {
1349 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1350 sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1351 ieee80211_sdata_running(sdata))
1352 res = drv_add_interface(local, sdata);
1356 mutex_lock(&local->sta_mtx);
1357 list_for_each_entry(sta, &local->sta_list, list) {
1358 enum ieee80211_sta_state state;
1363 /* AP-mode stations will be added later */
1364 if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
1367 for (state = IEEE80211_STA_NOTEXIST;
1368 state < sta->sta_state; state++)
1369 WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1372 mutex_unlock(&local->sta_mtx);
1374 /* reconfigure tx conf */
1375 if (hw->queues >= IEEE80211_NUM_ACS) {
1376 list_for_each_entry(sdata, &local->interfaces, list) {
1377 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1378 sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1379 !ieee80211_sdata_running(sdata))
1382 for (i = 0; i < IEEE80211_NUM_ACS; i++)
1383 drv_conf_tx(local, sdata, i,
1384 &sdata->tx_conf[i]);
1388 /* reconfigure hardware */
1389 ieee80211_hw_config(local, ~0);
1391 ieee80211_configure_filter(local);
1393 /* Finally also reconfigure all the BSS information */
1394 list_for_each_entry(sdata, &local->interfaces, list) {
1397 if (!ieee80211_sdata_running(sdata))
1400 /* common change flags for all interface types */
1401 changed = BSS_CHANGED_ERP_CTS_PROT |
1402 BSS_CHANGED_ERP_PREAMBLE |
1403 BSS_CHANGED_ERP_SLOT |
1405 BSS_CHANGED_BASIC_RATES |
1406 BSS_CHANGED_BEACON_INT |
1412 switch (sdata->vif.type) {
1413 case NL80211_IFTYPE_STATION:
1414 changed |= BSS_CHANGED_ASSOC |
1415 BSS_CHANGED_ARP_FILTER |
1417 mutex_lock(&sdata->u.mgd.mtx);
1418 ieee80211_bss_info_change_notify(sdata, changed);
1419 mutex_unlock(&sdata->u.mgd.mtx);
1421 case NL80211_IFTYPE_ADHOC:
1422 changed |= BSS_CHANGED_IBSS;
1424 case NL80211_IFTYPE_AP:
1425 changed |= BSS_CHANGED_SSID;
1427 if (sdata->vif.type == NL80211_IFTYPE_AP)
1428 changed |= BSS_CHANGED_AP_PROBE_RESP;
1431 case NL80211_IFTYPE_MESH_POINT:
1432 changed |= BSS_CHANGED_BEACON |
1433 BSS_CHANGED_BEACON_ENABLED;
1434 ieee80211_bss_info_change_notify(sdata, changed);
1436 case NL80211_IFTYPE_WDS:
1438 case NL80211_IFTYPE_AP_VLAN:
1439 case NL80211_IFTYPE_MONITOR:
1440 /* ignore virtual */
1442 case NL80211_IFTYPE_P2P_DEVICE:
1443 changed = BSS_CHANGED_IDLE;
1445 case NL80211_IFTYPE_UNSPECIFIED:
1446 case NUM_NL80211_IFTYPES:
1447 case NL80211_IFTYPE_P2P_CLIENT:
1448 case NL80211_IFTYPE_P2P_GO:
1454 ieee80211_recalc_ps(local, -1);
1457 * The sta might be in psm against the ap (e.g. because
1458 * this was the state before a hw restart), so we
1459 * explicitly send a null packet in order to make sure
1460 * it'll sync against the ap (and get out of psm).
1462 if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1463 list_for_each_entry(sdata, &local->interfaces, list) {
1464 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1467 ieee80211_send_nullfunc(local, sdata, 0);
1471 /* APs are now beaconing, add back stations */
1472 mutex_lock(&local->sta_mtx);
1473 list_for_each_entry(sta, &local->sta_list, list) {
1474 enum ieee80211_sta_state state;
1479 if (sta->sdata->vif.type != NL80211_IFTYPE_AP)
1482 for (state = IEEE80211_STA_NOTEXIST;
1483 state < sta->sta_state; state++)
1484 WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1487 mutex_unlock(&local->sta_mtx);
1490 list_for_each_entry(sdata, &local->interfaces, list)
1491 if (ieee80211_sdata_running(sdata))
1492 ieee80211_enable_keys(sdata);
1495 local->in_reconfig = false;
1499 * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1500 * sessions can be established after a resume.
1502 * Also tear down aggregation sessions since reconfiguring
1503 * them in a hardware restart scenario is not easily done
1504 * right now, and the hardware will have lost information
1505 * about the sessions, but we and the AP still think they
1506 * are active. This is really a workaround though.
1508 if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1509 mutex_lock(&local->sta_mtx);
1511 list_for_each_entry(sta, &local->sta_list, list) {
1512 ieee80211_sta_tear_down_BA_sessions(sta, true);
1513 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1516 mutex_unlock(&local->sta_mtx);
1519 ieee80211_wake_queues_by_reason(hw,
1520 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1523 * If this is for hw restart things are still running.
1524 * We may want to change that later, however.
1526 if (!local->suspended)
1530 /* first set suspended false, then resuming */
1531 local->suspended = false;
1533 local->resuming = false;
1535 list_for_each_entry(sdata, &local->interfaces, list) {
1536 switch(sdata->vif.type) {
1537 case NL80211_IFTYPE_STATION:
1538 ieee80211_sta_restart(sdata);
1540 case NL80211_IFTYPE_ADHOC:
1541 ieee80211_ibss_restart(sdata);
1543 case NL80211_IFTYPE_MESH_POINT:
1544 ieee80211_mesh_restart(sdata);
1551 mod_timer(&local->sta_cleanup, jiffies + 1);
1553 mutex_lock(&local->sta_mtx);
1554 list_for_each_entry(sta, &local->sta_list, list)
1555 mesh_plink_restart(sta);
1556 mutex_unlock(&local->sta_mtx);
1563 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1565 struct ieee80211_sub_if_data *sdata;
1566 struct ieee80211_local *local;
1567 struct ieee80211_key *key;
1572 sdata = vif_to_sdata(vif);
1573 local = sdata->local;
1575 if (WARN_ON(!local->resuming))
1578 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1581 sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1583 mutex_lock(&local->key_mtx);
1584 list_for_each_entry(key, &sdata->key_list, list)
1585 key->flags |= KEY_FLAG_TAINTED;
1586 mutex_unlock(&local->key_mtx);
1588 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1590 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1591 enum ieee80211_smps_mode *smps_mode)
1593 if (ifmgd->associated) {
1594 *smps_mode = ifmgd->ap_smps;
1596 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1597 if (ifmgd->powersave)
1598 *smps_mode = IEEE80211_SMPS_DYNAMIC;
1600 *smps_mode = IEEE80211_SMPS_OFF;
1609 void ieee80211_recalc_smps(struct ieee80211_local *local)
1611 struct ieee80211_sub_if_data *sdata;
1612 enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1615 mutex_lock(&local->iflist_mtx);
1618 * This function could be improved to handle multiple
1619 * interfaces better, but right now it makes any
1620 * non-station interfaces force SM PS to be turned
1621 * off. If there are multiple station interfaces it
1622 * could also use the best possible mode, e.g. if
1623 * one is in static and the other in dynamic then
1627 list_for_each_entry(sdata, &local->interfaces, list) {
1628 if (!ieee80211_sdata_running(sdata))
1630 if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE)
1632 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1635 count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1638 smps_mode = IEEE80211_SMPS_OFF;
1643 if (smps_mode == local->smps_mode)
1647 local->smps_mode = smps_mode;
1648 /* changed flag is auto-detected for this */
1649 ieee80211_hw_config(local, 0);
1651 mutex_unlock(&local->iflist_mtx);
1654 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1658 for (i = 0; i < n_ids; i++)
1665 * ieee80211_ie_split - split an IE buffer according to ordering
1667 * @ies: the IE buffer
1668 * @ielen: the length of the IE buffer
1669 * @ids: an array with element IDs that are allowed before
1671 * @n_ids: the size of the element ID array
1672 * @offset: offset where to start splitting in the buffer
1674 * This function splits an IE buffer by updating the @offset
1675 * variable to point to the location where the buffer should be
1678 * It assumes that the given IE buffer is well-formed, this
1679 * has to be guaranteed by the caller!
1681 * It also assumes that the IEs in the buffer are ordered
1682 * correctly, if not the result of using this function will not
1683 * be ordered correctly either, i.e. it does no reordering.
1685 * The function returns the offset where the next part of the
1686 * buffer starts, which may be @ielen if the entire (remainder)
1687 * of the buffer should be used.
1689 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1690 const u8 *ids, int n_ids, size_t offset)
1692 size_t pos = offset;
1694 while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1695 pos += 2 + ies[pos + 1];
1700 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1702 size_t pos = offset;
1704 while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1705 pos += 2 + ies[pos + 1];
1710 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1714 trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1716 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1720 * Scale up threshold values before storing it, as the RSSI averaging
1721 * algorithm uses a scaled up value as well. Change this scaling
1722 * factor if the RSSI averaging algorithm changes.
1724 sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1725 sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1728 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1732 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1734 WARN_ON(rssi_min_thold == rssi_max_thold ||
1735 rssi_min_thold > rssi_max_thold);
1737 _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
1740 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
1742 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
1744 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1746 _ieee80211_enable_rssi_reports(sdata, 0, 0);
1748 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1750 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1755 *pos++ = WLAN_EID_HT_CAPABILITY;
1756 *pos++ = sizeof(struct ieee80211_ht_cap);
1757 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
1759 /* capability flags */
1760 tmp = cpu_to_le16(cap);
1761 memcpy(pos, &tmp, sizeof(u16));
1764 /* AMPDU parameters */
1765 *pos++ = ht_cap->ampdu_factor |
1766 (ht_cap->ampdu_density <<
1767 IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
1770 memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
1771 pos += sizeof(ht_cap->mcs);
1773 /* extended capabilities */
1774 pos += sizeof(__le16);
1776 /* BF capabilities */
1777 pos += sizeof(__le32);
1779 /* antenna selection */
1785 u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
1790 *pos++ = WLAN_EID_VHT_CAPABILITY;
1791 *pos++ = sizeof(struct ieee80211_vht_capabilities);
1792 memset(pos, 0, sizeof(struct ieee80211_vht_capabilities));
1794 /* capability flags */
1795 tmp = cpu_to_le32(cap);
1796 memcpy(pos, &tmp, sizeof(u32));
1800 memcpy(pos, &vht_cap->vht_mcs, sizeof(vht_cap->vht_mcs));
1801 pos += sizeof(vht_cap->vht_mcs);
1806 u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1807 struct ieee80211_channel *channel,
1808 enum nl80211_channel_type channel_type,
1811 struct ieee80211_ht_operation *ht_oper;
1812 /* Build HT Information */
1813 *pos++ = WLAN_EID_HT_OPERATION;
1814 *pos++ = sizeof(struct ieee80211_ht_operation);
1815 ht_oper = (struct ieee80211_ht_operation *)pos;
1816 ht_oper->primary_chan =
1817 ieee80211_frequency_to_channel(channel->center_freq);
1818 switch (channel_type) {
1819 case NL80211_CHAN_HT40MINUS:
1820 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1822 case NL80211_CHAN_HT40PLUS:
1823 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1825 case NL80211_CHAN_HT20:
1827 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
1830 if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
1831 channel_type != NL80211_CHAN_NO_HT &&
1832 channel_type != NL80211_CHAN_HT20)
1833 ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
1835 ht_oper->operation_mode = cpu_to_le16(prot_mode);
1836 ht_oper->stbc_param = 0x0000;
1838 /* It seems that Basic MCS set and Supported MCS set
1839 are identical for the first 10 bytes */
1840 memset(&ht_oper->basic_set, 0, 16);
1841 memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
1843 return pos + sizeof(struct ieee80211_ht_operation);
1846 enum nl80211_channel_type
1847 ieee80211_ht_oper_to_channel_type(struct ieee80211_ht_operation *ht_oper)
1849 enum nl80211_channel_type channel_type;
1852 return NL80211_CHAN_NO_HT;
1854 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
1855 case IEEE80211_HT_PARAM_CHA_SEC_NONE:
1856 channel_type = NL80211_CHAN_HT20;
1858 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1859 channel_type = NL80211_CHAN_HT40PLUS;
1861 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1862 channel_type = NL80211_CHAN_HT40MINUS;
1865 channel_type = NL80211_CHAN_NO_HT;
1868 return channel_type;
1871 int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
1872 struct sk_buff *skb, bool need_basic,
1873 enum ieee80211_band band)
1875 struct ieee80211_local *local = sdata->local;
1876 struct ieee80211_supported_band *sband;
1879 u32 basic_rates = sdata->vif.bss_conf.basic_rates;
1881 sband = local->hw.wiphy->bands[band];
1882 rates = sband->n_bitrates;
1886 if (skb_tailroom(skb) < rates + 2)
1889 pos = skb_put(skb, rates + 2);
1890 *pos++ = WLAN_EID_SUPP_RATES;
1892 for (i = 0; i < rates; i++) {
1894 if (need_basic && basic_rates & BIT(i))
1896 rate = sband->bitrates[i].bitrate;
1897 *pos++ = basic | (u8) (rate / 5);
1903 int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
1904 struct sk_buff *skb, bool need_basic,
1905 enum ieee80211_band band)
1907 struct ieee80211_local *local = sdata->local;
1908 struct ieee80211_supported_band *sband;
1910 u8 i, exrates, *pos;
1911 u32 basic_rates = sdata->vif.bss_conf.basic_rates;
1913 sband = local->hw.wiphy->bands[band];
1914 exrates = sband->n_bitrates;
1920 if (skb_tailroom(skb) < exrates + 2)
1924 pos = skb_put(skb, exrates + 2);
1925 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1927 for (i = 8; i < sband->n_bitrates; i++) {
1929 if (need_basic && basic_rates & BIT(i))
1931 rate = sband->bitrates[i].bitrate;
1932 *pos++ = basic | (u8) (rate / 5);
1938 int ieee80211_ave_rssi(struct ieee80211_vif *vif)
1940 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1941 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1943 if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
1944 /* non-managed type inferfaces */
1947 return ifmgd->ave_beacon_signal;
1949 EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);