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/types.h>
17 #include <linux/slab.h>
18 #include <linux/skbuff.h>
19 #include <linux/etherdevice.h>
20 #include <linux/if_arp.h>
21 #include <linux/bitmap.h>
22 #include <linux/crc32.h>
23 #include <net/net_namespace.h>
24 #include <net/cfg80211.h>
25 #include <net/rtnetlink.h>
27 #include "ieee80211_i.h"
28 #include "driver-ops.h"
35 /* privid for wiphys to determine whether they belong to us or not */
36 void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
38 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
40 struct ieee80211_local *local;
43 local = wiphy_priv(wiphy);
46 EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
48 u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
49 enum nl80211_iftype type)
51 __le16 fc = hdr->frame_control;
53 /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
57 if (ieee80211_is_data(fc)) {
58 if (len < 24) /* drop incorrect hdr len (data) */
61 if (ieee80211_has_a4(fc))
63 if (ieee80211_has_tods(fc))
65 if (ieee80211_has_fromds(fc))
71 if (ieee80211_is_mgmt(fc)) {
72 if (len < 24) /* drop incorrect hdr len (mgmt) */
77 if (ieee80211_is_ctl(fc)) {
78 if(ieee80211_is_pspoll(fc))
81 if (ieee80211_is_back_req(fc)) {
83 case NL80211_IFTYPE_STATION:
85 case NL80211_IFTYPE_AP:
86 case NL80211_IFTYPE_AP_VLAN:
89 break; /* fall through to the return */
97 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
99 struct sk_buff *skb = tx->skb;
100 struct ieee80211_hdr *hdr;
103 hdr = (struct ieee80211_hdr *) skb->data;
104 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
105 } while ((skb = skb->next));
108 int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
109 int rate, int erp, int short_preamble)
113 /* calculate duration (in microseconds, rounded up to next higher
114 * integer if it includes a fractional microsecond) to send frame of
115 * len bytes (does not include FCS) at the given rate. Duration will
118 * rate is in 100 kbps, so divident is multiplied by 10 in the
119 * DIV_ROUND_UP() operations.
122 if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ || erp) {
126 * N_DBPS = DATARATE x 4
127 * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
128 * (16 = SIGNAL time, 6 = tail bits)
129 * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
132 * 802.11a - 17.5.2: aSIFSTime = 16 usec
133 * 802.11g - 19.8.4: aSIFSTime = 10 usec +
134 * signal ext = 6 usec
136 dur = 16; /* SIFS + signal ext */
137 dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
138 dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
139 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
140 4 * rate); /* T_SYM x N_SYM */
143 * 802.11b or 802.11g with 802.11b compatibility:
144 * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
145 * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
147 * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
148 * aSIFSTime = 10 usec
149 * aPreambleLength = 144 usec or 72 usec with short preamble
150 * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
152 dur = 10; /* aSIFSTime = 10 usec */
153 dur += short_preamble ? (72 + 24) : (144 + 48);
155 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
161 /* Exported duration function for driver use */
162 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
163 struct ieee80211_vif *vif,
165 struct ieee80211_rate *rate)
167 struct ieee80211_local *local = hw_to_local(hw);
168 struct ieee80211_sub_if_data *sdata;
171 bool short_preamble = false;
175 sdata = vif_to_sdata(vif);
176 short_preamble = sdata->vif.bss_conf.use_short_preamble;
177 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
178 erp = rate->flags & IEEE80211_RATE_ERP_G;
181 dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp,
184 return cpu_to_le16(dur);
186 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
188 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
189 struct ieee80211_vif *vif, size_t frame_len,
190 const struct ieee80211_tx_info *frame_txctl)
192 struct ieee80211_local *local = hw_to_local(hw);
193 struct ieee80211_rate *rate;
194 struct ieee80211_sub_if_data *sdata;
198 struct ieee80211_supported_band *sband;
200 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
202 short_preamble = false;
204 rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
208 sdata = vif_to_sdata(vif);
209 short_preamble = sdata->vif.bss_conf.use_short_preamble;
210 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
211 erp = rate->flags & IEEE80211_RATE_ERP_G;
215 dur = ieee80211_frame_duration(local, 10, rate->bitrate,
216 erp, short_preamble);
217 /* Data frame duration */
218 dur += ieee80211_frame_duration(local, frame_len, rate->bitrate,
219 erp, short_preamble);
221 dur += ieee80211_frame_duration(local, 10, rate->bitrate,
222 erp, short_preamble);
224 return cpu_to_le16(dur);
226 EXPORT_SYMBOL(ieee80211_rts_duration);
228 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
229 struct ieee80211_vif *vif,
231 const struct ieee80211_tx_info *frame_txctl)
233 struct ieee80211_local *local = hw_to_local(hw);
234 struct ieee80211_rate *rate;
235 struct ieee80211_sub_if_data *sdata;
239 struct ieee80211_supported_band *sband;
241 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
243 short_preamble = false;
245 rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
248 sdata = vif_to_sdata(vif);
249 short_preamble = sdata->vif.bss_conf.use_short_preamble;
250 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
251 erp = rate->flags & IEEE80211_RATE_ERP_G;
254 /* Data frame duration */
255 dur = ieee80211_frame_duration(local, frame_len, rate->bitrate,
256 erp, short_preamble);
257 if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
259 dur += ieee80211_frame_duration(local, 10, rate->bitrate,
260 erp, short_preamble);
263 return cpu_to_le16(dur);
265 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
267 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
268 enum queue_stop_reason reason)
270 struct ieee80211_local *local = hw_to_local(hw);
271 struct ieee80211_sub_if_data *sdata;
273 trace_wake_queue(local, queue, reason);
275 if (WARN_ON(queue >= hw->queues))
278 __clear_bit(reason, &local->queue_stop_reasons[queue]);
280 if (local->queue_stop_reasons[queue] != 0)
281 /* someone still has this queue stopped */
284 if (skb_queue_empty(&local->pending[queue])) {
286 list_for_each_entry_rcu(sdata, &local->interfaces, list)
287 netif_tx_wake_queue(netdev_get_tx_queue(sdata->dev, queue));
290 tasklet_schedule(&local->tx_pending_tasklet);
293 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
294 enum queue_stop_reason reason)
296 struct ieee80211_local *local = hw_to_local(hw);
299 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
300 __ieee80211_wake_queue(hw, queue, reason);
301 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
304 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
306 ieee80211_wake_queue_by_reason(hw, queue,
307 IEEE80211_QUEUE_STOP_REASON_DRIVER);
309 EXPORT_SYMBOL(ieee80211_wake_queue);
311 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
312 enum queue_stop_reason reason)
314 struct ieee80211_local *local = hw_to_local(hw);
315 struct ieee80211_sub_if_data *sdata;
317 trace_stop_queue(local, queue, reason);
319 if (WARN_ON(queue >= hw->queues))
322 __set_bit(reason, &local->queue_stop_reasons[queue]);
325 list_for_each_entry_rcu(sdata, &local->interfaces, list)
326 netif_tx_stop_queue(netdev_get_tx_queue(sdata->dev, queue));
330 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
331 enum queue_stop_reason reason)
333 struct ieee80211_local *local = hw_to_local(hw);
336 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
337 __ieee80211_stop_queue(hw, queue, reason);
338 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
341 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
343 ieee80211_stop_queue_by_reason(hw, queue,
344 IEEE80211_QUEUE_STOP_REASON_DRIVER);
346 EXPORT_SYMBOL(ieee80211_stop_queue);
348 void ieee80211_add_pending_skb(struct ieee80211_local *local,
351 struct ieee80211_hw *hw = &local->hw;
353 int queue = skb_get_queue_mapping(skb);
354 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
356 if (WARN_ON(!info->control.vif)) {
361 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
362 __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
363 __skb_queue_tail(&local->pending[queue], skb);
364 __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
365 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
368 int ieee80211_add_pending_skbs(struct ieee80211_local *local,
369 struct sk_buff_head *skbs)
371 struct ieee80211_hw *hw = &local->hw;
374 int queue, ret = 0, i;
376 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
377 for (i = 0; i < hw->queues; i++)
378 __ieee80211_stop_queue(hw, i,
379 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
381 while ((skb = skb_dequeue(skbs))) {
382 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
384 if (WARN_ON(!info->control.vif)) {
390 queue = skb_get_queue_mapping(skb);
391 __skb_queue_tail(&local->pending[queue], skb);
394 for (i = 0; i < hw->queues; i++)
395 __ieee80211_wake_queue(hw, i,
396 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
397 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
402 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
403 enum queue_stop_reason reason)
405 struct ieee80211_local *local = hw_to_local(hw);
409 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
411 for (i = 0; i < hw->queues; i++)
412 __ieee80211_stop_queue(hw, i, reason);
414 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
417 void ieee80211_stop_queues(struct ieee80211_hw *hw)
419 ieee80211_stop_queues_by_reason(hw,
420 IEEE80211_QUEUE_STOP_REASON_DRIVER);
422 EXPORT_SYMBOL(ieee80211_stop_queues);
424 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
426 struct ieee80211_local *local = hw_to_local(hw);
430 if (WARN_ON(queue >= hw->queues))
433 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
434 ret = !!local->queue_stop_reasons[queue];
435 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
438 EXPORT_SYMBOL(ieee80211_queue_stopped);
440 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
441 enum queue_stop_reason reason)
443 struct ieee80211_local *local = hw_to_local(hw);
447 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
449 for (i = 0; i < hw->queues; i++)
450 __ieee80211_wake_queue(hw, i, reason);
452 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
455 void ieee80211_wake_queues(struct ieee80211_hw *hw)
457 ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
459 EXPORT_SYMBOL(ieee80211_wake_queues);
461 void ieee80211_iterate_active_interfaces(
462 struct ieee80211_hw *hw,
463 void (*iterator)(void *data, u8 *mac,
464 struct ieee80211_vif *vif),
467 struct ieee80211_local *local = hw_to_local(hw);
468 struct ieee80211_sub_if_data *sdata;
470 mutex_lock(&local->iflist_mtx);
472 list_for_each_entry(sdata, &local->interfaces, list) {
473 switch (sdata->vif.type) {
474 case __NL80211_IFTYPE_AFTER_LAST:
475 case NL80211_IFTYPE_UNSPECIFIED:
476 case NL80211_IFTYPE_MONITOR:
477 case NL80211_IFTYPE_AP_VLAN:
479 case NL80211_IFTYPE_AP:
480 case NL80211_IFTYPE_STATION:
481 case NL80211_IFTYPE_ADHOC:
482 case NL80211_IFTYPE_WDS:
483 case NL80211_IFTYPE_MESH_POINT:
486 if (ieee80211_sdata_running(sdata))
487 iterator(data, sdata->vif.addr,
491 mutex_unlock(&local->iflist_mtx);
493 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
495 void ieee80211_iterate_active_interfaces_atomic(
496 struct ieee80211_hw *hw,
497 void (*iterator)(void *data, u8 *mac,
498 struct ieee80211_vif *vif),
501 struct ieee80211_local *local = hw_to_local(hw);
502 struct ieee80211_sub_if_data *sdata;
506 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
507 switch (sdata->vif.type) {
508 case __NL80211_IFTYPE_AFTER_LAST:
509 case NL80211_IFTYPE_UNSPECIFIED:
510 case NL80211_IFTYPE_MONITOR:
511 case NL80211_IFTYPE_AP_VLAN:
513 case NL80211_IFTYPE_AP:
514 case NL80211_IFTYPE_STATION:
515 case NL80211_IFTYPE_ADHOC:
516 case NL80211_IFTYPE_WDS:
517 case NL80211_IFTYPE_MESH_POINT:
520 if (ieee80211_sdata_running(sdata))
521 iterator(data, sdata->vif.addr,
527 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
530 * Nothing should have been stuffed into the workqueue during
531 * the suspend->resume cycle. If this WARN is seen then there
532 * is a bug with either the driver suspend or something in
533 * mac80211 stuffing into the workqueue which we haven't yet
534 * cleared during mac80211's suspend cycle.
536 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
538 if (WARN(local->suspended && !local->resuming,
539 "queueing ieee80211 work while going to suspend\n"))
545 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
547 struct ieee80211_local *local = hw_to_local(hw);
549 if (!ieee80211_can_queue_work(local))
552 queue_work(local->workqueue, work);
554 EXPORT_SYMBOL(ieee80211_queue_work);
556 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
557 struct delayed_work *dwork,
560 struct ieee80211_local *local = hw_to_local(hw);
562 if (!ieee80211_can_queue_work(local))
565 queue_delayed_work(local->workqueue, dwork, delay);
567 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
569 void ieee802_11_parse_elems(u8 *start, size_t len,
570 struct ieee802_11_elems *elems)
572 ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
575 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
576 struct ieee802_11_elems *elems,
581 bool calc_crc = filter != 0;
583 memset(elems, 0, sizeof(*elems));
584 elems->ie_start = start;
585 elems->total_len = len;
597 if (calc_crc && id < 64 && (filter & (1ULL << id)))
598 crc = crc32_be(crc, pos - 2, elen + 2);
603 elems->ssid_len = elen;
605 case WLAN_EID_SUPP_RATES:
606 elems->supp_rates = pos;
607 elems->supp_rates_len = elen;
609 case WLAN_EID_FH_PARAMS:
610 elems->fh_params = pos;
611 elems->fh_params_len = elen;
613 case WLAN_EID_DS_PARAMS:
614 elems->ds_params = pos;
615 elems->ds_params_len = elen;
617 case WLAN_EID_CF_PARAMS:
618 elems->cf_params = pos;
619 elems->cf_params_len = elen;
622 if (elen >= sizeof(struct ieee80211_tim_ie)) {
623 elems->tim = (void *)pos;
624 elems->tim_len = elen;
627 case WLAN_EID_IBSS_PARAMS:
628 elems->ibss_params = pos;
629 elems->ibss_params_len = elen;
631 case WLAN_EID_CHALLENGE:
632 elems->challenge = pos;
633 elems->challenge_len = elen;
635 case WLAN_EID_VENDOR_SPECIFIC:
636 if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
638 /* Microsoft OUI (00:50:F2) */
641 crc = crc32_be(crc, pos - 2, elen + 2);
644 /* OUI Type 1 - WPA IE */
646 elems->wpa_len = elen;
647 } else if (elen >= 5 && pos[3] == 2) {
648 /* OUI Type 2 - WMM IE */
650 elems->wmm_info = pos;
651 elems->wmm_info_len = elen;
652 } else if (pos[4] == 1) {
653 elems->wmm_param = pos;
654 elems->wmm_param_len = elen;
661 elems->rsn_len = elen;
663 case WLAN_EID_ERP_INFO:
664 elems->erp_info = pos;
665 elems->erp_info_len = elen;
667 case WLAN_EID_EXT_SUPP_RATES:
668 elems->ext_supp_rates = pos;
669 elems->ext_supp_rates_len = elen;
671 case WLAN_EID_HT_CAPABILITY:
672 if (elen >= sizeof(struct ieee80211_ht_cap))
673 elems->ht_cap_elem = (void *)pos;
675 case WLAN_EID_HT_INFORMATION:
676 if (elen >= sizeof(struct ieee80211_ht_info))
677 elems->ht_info_elem = (void *)pos;
679 case WLAN_EID_MESH_ID:
680 elems->mesh_id = pos;
681 elems->mesh_id_len = elen;
683 case WLAN_EID_MESH_CONFIG:
684 if (elen >= sizeof(struct ieee80211_meshconf_ie))
685 elems->mesh_config = (void *)pos;
687 case WLAN_EID_PEER_LINK:
688 elems->peer_link = pos;
689 elems->peer_link_len = elen;
693 elems->preq_len = elen;
697 elems->prep_len = elen;
701 elems->perr_len = elen;
704 if (elen >= sizeof(struct ieee80211_rann_ie))
705 elems->rann = (void *)pos;
707 case WLAN_EID_CHANNEL_SWITCH:
708 elems->ch_switch_elem = pos;
709 elems->ch_switch_elem_len = elen;
712 if (!elems->quiet_elem) {
713 elems->quiet_elem = pos;
714 elems->quiet_elem_len = elen;
716 elems->num_of_quiet_elem++;
718 case WLAN_EID_COUNTRY:
719 elems->country_elem = pos;
720 elems->country_elem_len = elen;
722 case WLAN_EID_PWR_CONSTRAINT:
723 elems->pwr_constr_elem = pos;
724 elems->pwr_constr_elem_len = elen;
726 case WLAN_EID_TIMEOUT_INTERVAL:
727 elems->timeout_int = pos;
728 elems->timeout_int_len = elen;
741 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
743 struct ieee80211_local *local = sdata->local;
744 struct ieee80211_tx_queue_params qparam;
749 if (!local->ops->conf_tx)
752 memset(&qparam, 0, sizeof(qparam));
754 use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
755 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
757 for (queue = 0; queue < local_to_hw(local)->queues; queue++) {
758 /* Set defaults according to 802.11-2007 Table 7-37 */
767 qparam.cw_max = aCWmax;
768 qparam.cw_min = aCWmin;
772 default: /* never happens but let's not leave undefined */
774 qparam.cw_max = aCWmax;
775 qparam.cw_min = aCWmin;
780 qparam.cw_max = aCWmin;
781 qparam.cw_min = (aCWmin + 1) / 2 - 1;
783 qparam.txop = 6016/32;
785 qparam.txop = 3008/32;
789 qparam.cw_max = (aCWmin + 1) / 2 - 1;
790 qparam.cw_min = (aCWmin + 1) / 4 - 1;
792 qparam.txop = 3264/32;
794 qparam.txop = 1504/32;
799 qparam.uapsd = false;
801 drv_conf_tx(local, queue, &qparam);
804 /* after reinitialize QoS TX queues setting to default,
805 * disable QoS at all */
807 if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
808 sdata->vif.bss_conf.qos =
809 sdata->vif.type != NL80211_IFTYPE_STATION;
810 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
814 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
815 const size_t supp_rates_len,
816 const u8 *supp_rates)
818 struct ieee80211_local *local = sdata->local;
819 int i, have_higher_than_11mbit = 0;
821 /* cf. IEEE 802.11 9.2.12 */
822 for (i = 0; i < supp_rates_len; i++)
823 if ((supp_rates[i] & 0x7f) * 5 > 110)
824 have_higher_than_11mbit = 1;
826 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
827 have_higher_than_11mbit)
828 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
830 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
832 ieee80211_set_wmm_default(sdata);
835 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
836 enum ieee80211_band band)
838 struct ieee80211_supported_band *sband;
839 struct ieee80211_rate *bitrates;
841 enum ieee80211_rate_flags mandatory_flag;
844 sband = local->hw.wiphy->bands[band];
847 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
850 if (band == IEEE80211_BAND_2GHZ)
851 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
853 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
855 bitrates = sband->bitrates;
857 for (i = 0; i < sband->n_bitrates; i++)
858 if (bitrates[i].flags & mandatory_flag)
859 mandatory_rates |= BIT(i);
860 return mandatory_rates;
863 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
864 u16 transaction, u16 auth_alg,
865 u8 *extra, size_t extra_len, const u8 *bssid,
866 const u8 *key, u8 key_len, u8 key_idx)
868 struct ieee80211_local *local = sdata->local;
870 struct ieee80211_mgmt *mgmt;
873 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
874 sizeof(*mgmt) + 6 + extra_len);
876 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
877 "frame\n", sdata->name);
880 skb_reserve(skb, local->hw.extra_tx_headroom);
882 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
883 memset(mgmt, 0, 24 + 6);
884 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
885 IEEE80211_STYPE_AUTH);
886 memcpy(mgmt->da, bssid, ETH_ALEN);
887 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
888 memcpy(mgmt->bssid, bssid, ETH_ALEN);
889 mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
890 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
891 mgmt->u.auth.status_code = cpu_to_le16(0);
893 memcpy(skb_put(skb, extra_len), extra, extra_len);
895 if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
896 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
897 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
901 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
902 ieee80211_tx_skb(sdata, skb);
905 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
906 const u8 *ie, size_t ie_len,
907 enum ieee80211_band band)
909 struct ieee80211_supported_band *sband;
911 size_t offset = 0, noffset;
912 int supp_rates_len, i;
914 sband = local->hw.wiphy->bands[band];
918 supp_rates_len = min_t(int, sband->n_bitrates, 8);
920 *pos++ = WLAN_EID_SUPP_RATES;
921 *pos++ = supp_rates_len;
923 for (i = 0; i < supp_rates_len; i++) {
924 int rate = sband->bitrates[i].bitrate;
925 *pos++ = (u8) (rate / 5);
928 /* insert "request information" if in custom IEs */
930 static const u8 before_extrates[] = {
935 noffset = ieee80211_ie_split(ie, ie_len,
937 ARRAY_SIZE(before_extrates),
939 memcpy(pos, ie + offset, noffset - offset);
940 pos += noffset - offset;
944 if (sband->n_bitrates > i) {
945 *pos++ = WLAN_EID_EXT_SUPP_RATES;
946 *pos++ = sband->n_bitrates - i;
948 for (; i < sband->n_bitrates; i++) {
949 int rate = sband->bitrates[i].bitrate;
950 *pos++ = (u8) (rate / 5);
954 /* insert custom IEs that go before HT */
956 static const u8 before_ht[] = {
960 WLAN_EID_EXT_SUPP_RATES,
962 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
964 noffset = ieee80211_ie_split(ie, ie_len,
965 before_ht, ARRAY_SIZE(before_ht),
967 memcpy(pos, ie + offset, noffset - offset);
968 pos += noffset - offset;
972 if (sband->ht_cap.ht_supported) {
973 u16 cap = sband->ht_cap.cap;
976 if (ieee80211_disable_40mhz_24ghz &&
977 sband->band == IEEE80211_BAND_2GHZ) {
978 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
979 cap &= ~IEEE80211_HT_CAP_SGI_40;
982 *pos++ = WLAN_EID_HT_CAPABILITY;
983 *pos++ = sizeof(struct ieee80211_ht_cap);
984 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
985 tmp = cpu_to_le16(cap);
986 memcpy(pos, &tmp, sizeof(u16));
988 *pos++ = sband->ht_cap.ampdu_factor |
989 (sband->ht_cap.ampdu_density <<
990 IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
991 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
992 pos += sizeof(sband->ht_cap.mcs);
993 pos += 2 + 4 + 1; /* ext info, BF cap, antsel */
997 * If adding more here, adjust code in main.c
998 * that calculates local->scan_ies_len.
1001 /* add any remaining custom IEs */
1004 memcpy(pos, ie + offset, noffset - offset);
1005 pos += noffset - offset;
1008 return pos - buffer;
1011 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1012 const u8 *ssid, size_t ssid_len,
1013 const u8 *ie, size_t ie_len)
1015 struct ieee80211_local *local = sdata->local;
1016 struct sk_buff *skb;
1017 struct ieee80211_mgmt *mgmt;
1021 /* FIXME: come up with a proper value */
1022 buf = kmalloc(200 + ie_len, GFP_KERNEL);
1024 printk(KERN_DEBUG "%s: failed to allocate temporary IE "
1025 "buffer\n", sdata->name);
1029 buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len,
1030 local->hw.conf.channel->band);
1032 skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1037 mgmt = (struct ieee80211_mgmt *) skb->data;
1038 memcpy(mgmt->da, dst, ETH_ALEN);
1039 memcpy(mgmt->bssid, dst, ETH_ALEN);
1042 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1043 ieee80211_tx_skb(sdata, skb);
1047 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1048 struct ieee802_11_elems *elems,
1049 enum ieee80211_band band)
1051 struct ieee80211_supported_band *sband;
1052 struct ieee80211_rate *bitrates;
1056 sband = local->hw.wiphy->bands[band];
1060 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1063 bitrates = sband->bitrates;
1064 num_rates = sband->n_bitrates;
1066 for (i = 0; i < elems->supp_rates_len +
1067 elems->ext_supp_rates_len; i++) {
1070 if (i < elems->supp_rates_len)
1071 rate = elems->supp_rates[i];
1072 else if (elems->ext_supp_rates)
1073 rate = elems->ext_supp_rates
1074 [i - elems->supp_rates_len];
1075 own_rate = 5 * (rate & 0x7f);
1076 for (j = 0; j < num_rates; j++)
1077 if (bitrates[j].bitrate == own_rate)
1078 supp_rates |= BIT(j);
1083 void ieee80211_stop_device(struct ieee80211_local *local)
1085 ieee80211_led_radio(local, false);
1087 cancel_work_sync(&local->reconfig_filter);
1089 flush_workqueue(local->workqueue);
1093 int ieee80211_reconfig(struct ieee80211_local *local)
1095 struct ieee80211_hw *hw = &local->hw;
1096 struct ieee80211_sub_if_data *sdata;
1097 struct sta_info *sta;
1100 if (local->suspended)
1101 local->resuming = true;
1103 /* restart hardware */
1104 if (local->open_count) {
1106 * Upon resume hardware can sometimes be goofy due to
1107 * various platform / driver / bus issues, so restarting
1108 * the device may at times not work immediately. Propagate
1111 res = drv_start(local);
1113 WARN(local->suspended, "Hardware became unavailable "
1114 "upon resume. This could be a software issue "
1115 "prior to suspend or a hardware issue.\n");
1119 ieee80211_led_radio(local, true);
1122 /* add interfaces */
1123 list_for_each_entry(sdata, &local->interfaces, list) {
1124 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1125 sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1126 ieee80211_sdata_running(sdata))
1127 res = drv_add_interface(local, &sdata->vif);
1131 mutex_lock(&local->sta_mtx);
1132 list_for_each_entry(sta, &local->sta_list, list) {
1133 if (sta->uploaded) {
1135 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1136 sdata = container_of(sdata->bss,
1137 struct ieee80211_sub_if_data,
1140 WARN_ON(drv_sta_add(local, sdata, &sta->sta));
1143 mutex_unlock(&local->sta_mtx);
1145 /* setup RTS threshold */
1146 drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1148 /* reconfigure hardware */
1149 ieee80211_hw_config(local, ~0);
1151 ieee80211_configure_filter(local);
1153 /* Finally also reconfigure all the BSS information */
1154 list_for_each_entry(sdata, &local->interfaces, list) {
1157 if (!ieee80211_sdata_running(sdata))
1160 /* common change flags for all interface types */
1161 changed = BSS_CHANGED_ERP_CTS_PROT |
1162 BSS_CHANGED_ERP_PREAMBLE |
1163 BSS_CHANGED_ERP_SLOT |
1165 BSS_CHANGED_BASIC_RATES |
1166 BSS_CHANGED_BEACON_INT |
1171 switch (sdata->vif.type) {
1172 case NL80211_IFTYPE_STATION:
1173 changed |= BSS_CHANGED_ASSOC;
1174 ieee80211_bss_info_change_notify(sdata, changed);
1176 case NL80211_IFTYPE_ADHOC:
1177 changed |= BSS_CHANGED_IBSS;
1179 case NL80211_IFTYPE_AP:
1180 case NL80211_IFTYPE_MESH_POINT:
1181 changed |= BSS_CHANGED_BEACON |
1182 BSS_CHANGED_BEACON_ENABLED;
1183 ieee80211_bss_info_change_notify(sdata, changed);
1185 case NL80211_IFTYPE_WDS:
1187 case NL80211_IFTYPE_AP_VLAN:
1188 case NL80211_IFTYPE_MONITOR:
1189 /* ignore virtual */
1191 case NL80211_IFTYPE_UNSPECIFIED:
1192 case __NL80211_IFTYPE_AFTER_LAST:
1199 * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1200 * sessions can be established after a resume.
1202 * Also tear down aggregation sessions since reconfiguring
1203 * them in a hardware restart scenario is not easily done
1204 * right now, and the hardware will have lost information
1205 * about the sessions, but we and the AP still think they
1206 * are active. This is really a workaround though.
1208 if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1209 mutex_lock(&local->sta_mtx);
1211 list_for_each_entry(sta, &local->sta_list, list) {
1212 ieee80211_sta_tear_down_BA_sessions(sta);
1213 clear_sta_flags(sta, WLAN_STA_BLOCK_BA);
1216 mutex_unlock(&local->sta_mtx);
1220 list_for_each_entry(sdata, &local->interfaces, list)
1221 if (ieee80211_sdata_running(sdata))
1222 ieee80211_enable_keys(sdata);
1224 ieee80211_wake_queues_by_reason(hw,
1225 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1228 * If this is for hw restart things are still running.
1229 * We may want to change that later, however.
1231 if (!local->suspended)
1235 /* first set suspended false, then resuming */
1236 local->suspended = false;
1238 local->resuming = false;
1240 list_for_each_entry(sdata, &local->interfaces, list) {
1241 switch(sdata->vif.type) {
1242 case NL80211_IFTYPE_STATION:
1243 ieee80211_sta_restart(sdata);
1245 case NL80211_IFTYPE_ADHOC:
1246 ieee80211_ibss_restart(sdata);
1248 case NL80211_IFTYPE_MESH_POINT:
1249 ieee80211_mesh_restart(sdata);
1256 add_timer(&local->sta_cleanup);
1258 mutex_lock(&local->sta_mtx);
1259 list_for_each_entry(sta, &local->sta_list, list)
1260 mesh_plink_restart(sta);
1261 mutex_unlock(&local->sta_mtx);
1268 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1269 enum ieee80211_smps_mode *smps_mode)
1271 if (ifmgd->associated) {
1272 *smps_mode = ifmgd->ap_smps;
1274 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1275 if (ifmgd->powersave)
1276 *smps_mode = IEEE80211_SMPS_DYNAMIC;
1278 *smps_mode = IEEE80211_SMPS_OFF;
1287 /* must hold iflist_mtx */
1288 void ieee80211_recalc_smps(struct ieee80211_local *local,
1289 struct ieee80211_sub_if_data *forsdata)
1291 struct ieee80211_sub_if_data *sdata;
1292 enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1296 WARN_ON(!mutex_is_locked(&forsdata->u.mgd.mtx));
1298 WARN_ON(!mutex_is_locked(&local->iflist_mtx));
1301 * This function could be improved to handle multiple
1302 * interfaces better, but right now it makes any
1303 * non-station interfaces force SM PS to be turned
1304 * off. If there are multiple station interfaces it
1305 * could also use the best possible mode, e.g. if
1306 * one is in static and the other in dynamic then
1310 list_for_each_entry(sdata, &local->interfaces, list) {
1311 if (!netif_running(sdata->dev))
1313 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1315 if (sdata != forsdata) {
1317 * This nested is ok -- we are holding the iflist_mtx
1318 * so can't get here twice or so. But it's required
1319 * since normally we acquire it first and then the
1322 mutex_lock_nested(&sdata->u.mgd.mtx, SINGLE_DEPTH_NESTING);
1323 count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1324 mutex_unlock(&sdata->u.mgd.mtx);
1326 count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1329 smps_mode = IEEE80211_SMPS_OFF;
1334 if (smps_mode == local->smps_mode)
1338 local->smps_mode = smps_mode;
1339 /* changed flag is auto-detected for this */
1340 ieee80211_hw_config(local, 0);
1343 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1347 for (i = 0; i < n_ids; i++)
1354 * ieee80211_ie_split - split an IE buffer according to ordering
1356 * @ies: the IE buffer
1357 * @ielen: the length of the IE buffer
1358 * @ids: an array with element IDs that are allowed before
1360 * @n_ids: the size of the element ID array
1361 * @offset: offset where to start splitting in the buffer
1363 * This function splits an IE buffer by updating the @offset
1364 * variable to point to the location where the buffer should be
1367 * It assumes that the given IE buffer is well-formed, this
1368 * has to be guaranteed by the caller!
1370 * It also assumes that the IEs in the buffer are ordered
1371 * correctly, if not the result of using this function will not
1372 * be ordered correctly either, i.e. it does no reordering.
1374 * The function returns the offset where the next part of the
1375 * buffer starts, which may be @ielen if the entire (remainder)
1376 * of the buffer should be used.
1378 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1379 const u8 *ids, int n_ids, size_t offset)
1381 size_t pos = offset;
1383 while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1384 pos += 2 + ies[pos + 1];
1389 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1391 size_t pos = offset;
1393 while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1394 pos += 2 + ies[pos + 1];