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 if (WARN_ON(queue >= hw->queues))
276 __clear_bit(reason, &local->queue_stop_reasons[queue]);
278 if (local->queue_stop_reasons[queue] != 0)
279 /* someone still has this queue stopped */
282 if (!skb_queue_empty(&local->pending[queue]))
283 tasklet_schedule(&local->tx_pending_tasklet);
286 list_for_each_entry_rcu(sdata, &local->interfaces, list)
287 netif_tx_wake_queue(netdev_get_tx_queue(sdata->dev, queue));
291 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
292 enum queue_stop_reason reason)
294 struct ieee80211_local *local = hw_to_local(hw);
297 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
298 __ieee80211_wake_queue(hw, queue, reason);
299 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
302 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
304 ieee80211_wake_queue_by_reason(hw, queue,
305 IEEE80211_QUEUE_STOP_REASON_DRIVER);
307 EXPORT_SYMBOL(ieee80211_wake_queue);
309 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
310 enum queue_stop_reason reason)
312 struct ieee80211_local *local = hw_to_local(hw);
313 struct ieee80211_sub_if_data *sdata;
315 if (WARN_ON(queue >= hw->queues))
318 __set_bit(reason, &local->queue_stop_reasons[queue]);
321 list_for_each_entry_rcu(sdata, &local->interfaces, list)
322 netif_tx_stop_queue(netdev_get_tx_queue(sdata->dev, queue));
326 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
327 enum queue_stop_reason reason)
329 struct ieee80211_local *local = hw_to_local(hw);
332 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
333 __ieee80211_stop_queue(hw, queue, reason);
334 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
337 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
339 ieee80211_stop_queue_by_reason(hw, queue,
340 IEEE80211_QUEUE_STOP_REASON_DRIVER);
342 EXPORT_SYMBOL(ieee80211_stop_queue);
344 void ieee80211_add_pending_skb(struct ieee80211_local *local,
347 struct ieee80211_hw *hw = &local->hw;
349 int queue = skb_get_queue_mapping(skb);
350 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
352 if (WARN_ON(!info->control.vif)) {
357 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
358 __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
359 __skb_queue_tail(&local->pending[queue], skb);
360 __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
361 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
364 int ieee80211_add_pending_skbs(struct ieee80211_local *local,
365 struct sk_buff_head *skbs)
367 struct ieee80211_hw *hw = &local->hw;
370 int queue, ret = 0, i;
372 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
373 for (i = 0; i < hw->queues; i++)
374 __ieee80211_stop_queue(hw, i,
375 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
377 while ((skb = skb_dequeue(skbs))) {
378 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
380 if (WARN_ON(!info->control.vif)) {
386 queue = skb_get_queue_mapping(skb);
387 __skb_queue_tail(&local->pending[queue], skb);
390 for (i = 0; i < hw->queues; i++)
391 __ieee80211_wake_queue(hw, i,
392 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
393 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
398 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
399 enum queue_stop_reason reason)
401 struct ieee80211_local *local = hw_to_local(hw);
405 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
407 for (i = 0; i < hw->queues; i++)
408 __ieee80211_stop_queue(hw, i, reason);
410 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
413 void ieee80211_stop_queues(struct ieee80211_hw *hw)
415 ieee80211_stop_queues_by_reason(hw,
416 IEEE80211_QUEUE_STOP_REASON_DRIVER);
418 EXPORT_SYMBOL(ieee80211_stop_queues);
420 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
422 struct ieee80211_local *local = hw_to_local(hw);
426 if (WARN_ON(queue >= hw->queues))
429 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
430 ret = !!local->queue_stop_reasons[queue];
431 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
434 EXPORT_SYMBOL(ieee80211_queue_stopped);
436 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
437 enum queue_stop_reason reason)
439 struct ieee80211_local *local = hw_to_local(hw);
443 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
445 for (i = 0; i < hw->queues; i++)
446 __ieee80211_wake_queue(hw, i, reason);
448 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
451 void ieee80211_wake_queues(struct ieee80211_hw *hw)
453 ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
455 EXPORT_SYMBOL(ieee80211_wake_queues);
457 void ieee80211_iterate_active_interfaces(
458 struct ieee80211_hw *hw,
459 void (*iterator)(void *data, u8 *mac,
460 struct ieee80211_vif *vif),
463 struct ieee80211_local *local = hw_to_local(hw);
464 struct ieee80211_sub_if_data *sdata;
466 mutex_lock(&local->iflist_mtx);
468 list_for_each_entry(sdata, &local->interfaces, list) {
469 switch (sdata->vif.type) {
470 case __NL80211_IFTYPE_AFTER_LAST:
471 case NL80211_IFTYPE_UNSPECIFIED:
472 case NL80211_IFTYPE_MONITOR:
473 case NL80211_IFTYPE_AP_VLAN:
475 case NL80211_IFTYPE_AP:
476 case NL80211_IFTYPE_STATION:
477 case NL80211_IFTYPE_ADHOC:
478 case NL80211_IFTYPE_WDS:
479 case NL80211_IFTYPE_MESH_POINT:
482 if (ieee80211_sdata_running(sdata))
483 iterator(data, sdata->vif.addr,
487 mutex_unlock(&local->iflist_mtx);
489 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
491 void ieee80211_iterate_active_interfaces_atomic(
492 struct ieee80211_hw *hw,
493 void (*iterator)(void *data, u8 *mac,
494 struct ieee80211_vif *vif),
497 struct ieee80211_local *local = hw_to_local(hw);
498 struct ieee80211_sub_if_data *sdata;
502 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
503 switch (sdata->vif.type) {
504 case __NL80211_IFTYPE_AFTER_LAST:
505 case NL80211_IFTYPE_UNSPECIFIED:
506 case NL80211_IFTYPE_MONITOR:
507 case NL80211_IFTYPE_AP_VLAN:
509 case NL80211_IFTYPE_AP:
510 case NL80211_IFTYPE_STATION:
511 case NL80211_IFTYPE_ADHOC:
512 case NL80211_IFTYPE_WDS:
513 case NL80211_IFTYPE_MESH_POINT:
516 if (ieee80211_sdata_running(sdata))
517 iterator(data, sdata->vif.addr,
523 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
526 * Nothing should have been stuffed into the workqueue during
527 * the suspend->resume cycle. If this WARN is seen then there
528 * is a bug with either the driver suspend or something in
529 * mac80211 stuffing into the workqueue which we haven't yet
530 * cleared during mac80211's suspend cycle.
532 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
534 if (WARN(local->suspended && !local->resuming,
535 "queueing ieee80211 work while going to suspend\n"))
541 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
543 struct ieee80211_local *local = hw_to_local(hw);
545 if (!ieee80211_can_queue_work(local))
548 queue_work(local->workqueue, work);
550 EXPORT_SYMBOL(ieee80211_queue_work);
552 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
553 struct delayed_work *dwork,
556 struct ieee80211_local *local = hw_to_local(hw);
558 if (!ieee80211_can_queue_work(local))
561 queue_delayed_work(local->workqueue, dwork, delay);
563 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
565 void ieee802_11_parse_elems(u8 *start, size_t len,
566 struct ieee802_11_elems *elems)
568 ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
571 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
572 struct ieee802_11_elems *elems,
577 bool calc_crc = filter != 0;
579 memset(elems, 0, sizeof(*elems));
580 elems->ie_start = start;
581 elems->total_len = len;
593 if (calc_crc && id < 64 && (filter & (1ULL << id)))
594 crc = crc32_be(crc, pos - 2, elen + 2);
599 elems->ssid_len = elen;
601 case WLAN_EID_SUPP_RATES:
602 elems->supp_rates = pos;
603 elems->supp_rates_len = elen;
605 case WLAN_EID_FH_PARAMS:
606 elems->fh_params = pos;
607 elems->fh_params_len = elen;
609 case WLAN_EID_DS_PARAMS:
610 elems->ds_params = pos;
611 elems->ds_params_len = elen;
613 case WLAN_EID_CF_PARAMS:
614 elems->cf_params = pos;
615 elems->cf_params_len = elen;
618 if (elen >= sizeof(struct ieee80211_tim_ie)) {
619 elems->tim = (void *)pos;
620 elems->tim_len = elen;
623 case WLAN_EID_IBSS_PARAMS:
624 elems->ibss_params = pos;
625 elems->ibss_params_len = elen;
627 case WLAN_EID_CHALLENGE:
628 elems->challenge = pos;
629 elems->challenge_len = elen;
631 case WLAN_EID_VENDOR_SPECIFIC:
632 if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
634 /* Microsoft OUI (00:50:F2) */
637 crc = crc32_be(crc, pos - 2, elen + 2);
640 /* OUI Type 1 - WPA IE */
642 elems->wpa_len = elen;
643 } else if (elen >= 5 && pos[3] == 2) {
644 /* OUI Type 2 - WMM IE */
646 elems->wmm_info = pos;
647 elems->wmm_info_len = elen;
648 } else if (pos[4] == 1) {
649 elems->wmm_param = pos;
650 elems->wmm_param_len = elen;
657 elems->rsn_len = elen;
659 case WLAN_EID_ERP_INFO:
660 elems->erp_info = pos;
661 elems->erp_info_len = elen;
663 case WLAN_EID_EXT_SUPP_RATES:
664 elems->ext_supp_rates = pos;
665 elems->ext_supp_rates_len = elen;
667 case WLAN_EID_HT_CAPABILITY:
668 if (elen >= sizeof(struct ieee80211_ht_cap))
669 elems->ht_cap_elem = (void *)pos;
671 case WLAN_EID_HT_INFORMATION:
672 if (elen >= sizeof(struct ieee80211_ht_info))
673 elems->ht_info_elem = (void *)pos;
675 case WLAN_EID_MESH_ID:
676 elems->mesh_id = pos;
677 elems->mesh_id_len = elen;
679 case WLAN_EID_MESH_CONFIG:
680 if (elen >= sizeof(struct ieee80211_meshconf_ie))
681 elems->mesh_config = (void *)pos;
683 case WLAN_EID_PEER_LINK:
684 elems->peer_link = pos;
685 elems->peer_link_len = elen;
689 elems->preq_len = elen;
693 elems->prep_len = elen;
697 elems->perr_len = elen;
700 if (elen >= sizeof(struct ieee80211_rann_ie))
701 elems->rann = (void *)pos;
703 case WLAN_EID_CHANNEL_SWITCH:
704 elems->ch_switch_elem = pos;
705 elems->ch_switch_elem_len = elen;
708 if (!elems->quiet_elem) {
709 elems->quiet_elem = pos;
710 elems->quiet_elem_len = elen;
712 elems->num_of_quiet_elem++;
714 case WLAN_EID_COUNTRY:
715 elems->country_elem = pos;
716 elems->country_elem_len = elen;
718 case WLAN_EID_PWR_CONSTRAINT:
719 elems->pwr_constr_elem = pos;
720 elems->pwr_constr_elem_len = elen;
722 case WLAN_EID_TIMEOUT_INTERVAL:
723 elems->timeout_int = pos;
724 elems->timeout_int_len = elen;
737 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
739 struct ieee80211_local *local = sdata->local;
740 struct ieee80211_tx_queue_params qparam;
745 if (!local->ops->conf_tx)
748 memset(&qparam, 0, sizeof(qparam));
750 use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
751 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
753 for (queue = 0; queue < local_to_hw(local)->queues; queue++) {
754 /* Set defaults according to 802.11-2007 Table 7-37 */
763 qparam.cw_max = aCWmax;
764 qparam.cw_min = aCWmin;
768 default: /* never happens but let's not leave undefined */
770 qparam.cw_max = aCWmax;
771 qparam.cw_min = aCWmin;
776 qparam.cw_max = aCWmin;
777 qparam.cw_min = (aCWmin + 1) / 2 - 1;
779 qparam.txop = 6016/32;
781 qparam.txop = 3008/32;
785 qparam.cw_max = (aCWmin + 1) / 2 - 1;
786 qparam.cw_min = (aCWmin + 1) / 4 - 1;
788 qparam.txop = 3264/32;
790 qparam.txop = 1504/32;
795 drv_conf_tx(local, queue, &qparam);
799 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
800 const size_t supp_rates_len,
801 const u8 *supp_rates)
803 struct ieee80211_local *local = sdata->local;
804 int i, have_higher_than_11mbit = 0;
806 /* cf. IEEE 802.11 9.2.12 */
807 for (i = 0; i < supp_rates_len; i++)
808 if ((supp_rates[i] & 0x7f) * 5 > 110)
809 have_higher_than_11mbit = 1;
811 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
812 have_higher_than_11mbit)
813 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
815 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
817 ieee80211_set_wmm_default(sdata);
820 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
821 enum ieee80211_band band)
823 struct ieee80211_supported_band *sband;
824 struct ieee80211_rate *bitrates;
826 enum ieee80211_rate_flags mandatory_flag;
829 sband = local->hw.wiphy->bands[band];
832 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
835 if (band == IEEE80211_BAND_2GHZ)
836 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
838 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
840 bitrates = sband->bitrates;
842 for (i = 0; i < sband->n_bitrates; i++)
843 if (bitrates[i].flags & mandatory_flag)
844 mandatory_rates |= BIT(i);
845 return mandatory_rates;
848 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
849 u16 transaction, u16 auth_alg,
850 u8 *extra, size_t extra_len, const u8 *bssid,
851 const u8 *key, u8 key_len, u8 key_idx)
853 struct ieee80211_local *local = sdata->local;
855 struct ieee80211_mgmt *mgmt;
858 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
859 sizeof(*mgmt) + 6 + extra_len);
861 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
862 "frame\n", sdata->name);
865 skb_reserve(skb, local->hw.extra_tx_headroom);
867 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
868 memset(mgmt, 0, 24 + 6);
869 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
870 IEEE80211_STYPE_AUTH);
871 memcpy(mgmt->da, bssid, ETH_ALEN);
872 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
873 memcpy(mgmt->bssid, bssid, ETH_ALEN);
874 mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
875 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
876 mgmt->u.auth.status_code = cpu_to_le16(0);
878 memcpy(skb_put(skb, extra_len), extra, extra_len);
880 if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
881 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
882 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
886 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
887 ieee80211_tx_skb(sdata, skb);
890 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
891 const u8 *ie, size_t ie_len,
892 enum ieee80211_band band)
894 struct ieee80211_supported_band *sband;
896 size_t offset = 0, noffset;
897 int supp_rates_len, i;
899 sband = local->hw.wiphy->bands[band];
903 supp_rates_len = min_t(int, sband->n_bitrates, 8);
905 *pos++ = WLAN_EID_SUPP_RATES;
906 *pos++ = supp_rates_len;
908 for (i = 0; i < supp_rates_len; i++) {
909 int rate = sband->bitrates[i].bitrate;
910 *pos++ = (u8) (rate / 5);
913 /* insert "request information" if in custom IEs */
915 static const u8 before_extrates[] = {
920 noffset = ieee80211_ie_split(ie, ie_len,
922 ARRAY_SIZE(before_extrates),
924 memcpy(pos, ie + offset, noffset - offset);
925 pos += noffset - offset;
929 if (sband->n_bitrates > i) {
930 *pos++ = WLAN_EID_EXT_SUPP_RATES;
931 *pos++ = sband->n_bitrates - i;
933 for (; i < sband->n_bitrates; i++) {
934 int rate = sband->bitrates[i].bitrate;
935 *pos++ = (u8) (rate / 5);
939 /* insert custom IEs that go before HT */
941 static const u8 before_ht[] = {
945 WLAN_EID_EXT_SUPP_RATES,
947 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
949 noffset = ieee80211_ie_split(ie, ie_len,
950 before_ht, ARRAY_SIZE(before_ht),
952 memcpy(pos, ie + offset, noffset - offset);
953 pos += noffset - offset;
957 if (sband->ht_cap.ht_supported) {
958 u16 cap = sband->ht_cap.cap;
961 if (ieee80211_disable_40mhz_24ghz &&
962 sband->band == IEEE80211_BAND_2GHZ) {
963 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
964 cap &= ~IEEE80211_HT_CAP_SGI_40;
967 *pos++ = WLAN_EID_HT_CAPABILITY;
968 *pos++ = sizeof(struct ieee80211_ht_cap);
969 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
970 tmp = cpu_to_le16(cap);
971 memcpy(pos, &tmp, sizeof(u16));
973 *pos++ = sband->ht_cap.ampdu_factor |
974 (sband->ht_cap.ampdu_density <<
975 IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
976 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
977 pos += sizeof(sband->ht_cap.mcs);
978 pos += 2 + 4 + 1; /* ext info, BF cap, antsel */
982 * If adding more here, adjust code in main.c
983 * that calculates local->scan_ies_len.
986 /* add any remaining custom IEs */
989 memcpy(pos, ie + offset, noffset - offset);
990 pos += noffset - offset;
996 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
997 const u8 *ssid, size_t ssid_len,
998 const u8 *ie, size_t ie_len)
1000 struct ieee80211_local *local = sdata->local;
1001 struct sk_buff *skb;
1002 struct ieee80211_mgmt *mgmt;
1006 /* FIXME: come up with a proper value */
1007 buf = kmalloc(200 + ie_len, GFP_KERNEL);
1009 printk(KERN_DEBUG "%s: failed to allocate temporary IE "
1010 "buffer\n", sdata->name);
1014 buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len,
1015 local->hw.conf.channel->band);
1017 skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1022 mgmt = (struct ieee80211_mgmt *) skb->data;
1023 memcpy(mgmt->da, dst, ETH_ALEN);
1024 memcpy(mgmt->bssid, dst, ETH_ALEN);
1027 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1028 ieee80211_tx_skb(sdata, skb);
1031 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1032 struct ieee802_11_elems *elems,
1033 enum ieee80211_band band)
1035 struct ieee80211_supported_band *sband;
1036 struct ieee80211_rate *bitrates;
1040 sband = local->hw.wiphy->bands[band];
1044 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1047 bitrates = sband->bitrates;
1048 num_rates = sband->n_bitrates;
1050 for (i = 0; i < elems->supp_rates_len +
1051 elems->ext_supp_rates_len; i++) {
1054 if (i < elems->supp_rates_len)
1055 rate = elems->supp_rates[i];
1056 else if (elems->ext_supp_rates)
1057 rate = elems->ext_supp_rates
1058 [i - elems->supp_rates_len];
1059 own_rate = 5 * (rate & 0x7f);
1060 for (j = 0; j < num_rates; j++)
1061 if (bitrates[j].bitrate == own_rate)
1062 supp_rates |= BIT(j);
1067 void ieee80211_stop_device(struct ieee80211_local *local)
1069 ieee80211_led_radio(local, false);
1071 cancel_work_sync(&local->reconfig_filter);
1073 flush_workqueue(local->workqueue);
1077 int ieee80211_reconfig(struct ieee80211_local *local)
1079 struct ieee80211_hw *hw = &local->hw;
1080 struct ieee80211_sub_if_data *sdata;
1081 struct sta_info *sta;
1082 unsigned long flags;
1085 if (local->suspended)
1086 local->resuming = true;
1088 /* restart hardware */
1089 if (local->open_count) {
1091 * Upon resume hardware can sometimes be goofy due to
1092 * various platform / driver / bus issues, so restarting
1093 * the device may at times not work immediately. Propagate
1096 res = drv_start(local);
1098 WARN(local->suspended, "Harware became unavailable "
1099 "upon resume. This is could be a software issue"
1100 "prior to suspend or a hardware issue\n");
1104 ieee80211_led_radio(local, true);
1107 /* add interfaces */
1108 list_for_each_entry(sdata, &local->interfaces, list) {
1109 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1110 sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1111 ieee80211_sdata_running(sdata))
1112 res = drv_add_interface(local, &sdata->vif);
1116 if (local->ops->sta_notify) {
1117 spin_lock_irqsave(&local->sta_lock, flags);
1118 list_for_each_entry(sta, &local->sta_list, list) {
1120 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1121 sdata = container_of(sdata->bss,
1122 struct ieee80211_sub_if_data,
1125 drv_sta_notify(local, sdata, STA_NOTIFY_ADD,
1128 spin_unlock_irqrestore(&local->sta_lock, flags);
1131 /* Clear Suspend state so that ADDBA requests can be processed */
1135 if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1136 list_for_each_entry_rcu(sta, &local->sta_list, list) {
1137 clear_sta_flags(sta, WLAN_STA_SUSPEND);
1143 /* setup RTS threshold */
1144 drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1146 /* reconfigure hardware */
1147 ieee80211_hw_config(local, ~0);
1149 ieee80211_configure_filter(local);
1151 /* Finally also reconfigure all the BSS information */
1152 list_for_each_entry(sdata, &local->interfaces, list) {
1154 if (!ieee80211_sdata_running(sdata))
1156 switch (sdata->vif.type) {
1157 case NL80211_IFTYPE_STATION:
1158 /* disable beacon change bits */
1159 changed &= ~(BSS_CHANGED_BEACON |
1160 BSS_CHANGED_BEACON_ENABLED);
1162 case NL80211_IFTYPE_ADHOC:
1163 case NL80211_IFTYPE_AP:
1164 case NL80211_IFTYPE_MESH_POINT:
1165 ieee80211_bss_info_change_notify(sdata, changed);
1167 case NL80211_IFTYPE_WDS:
1169 case NL80211_IFTYPE_AP_VLAN:
1170 case NL80211_IFTYPE_MONITOR:
1171 /* ignore virtual */
1173 case NL80211_IFTYPE_UNSPECIFIED:
1174 case __NL80211_IFTYPE_AFTER_LAST:
1181 list_for_each_entry(sdata, &local->interfaces, list)
1182 if (ieee80211_sdata_running(sdata))
1183 ieee80211_enable_keys(sdata);
1185 ieee80211_wake_queues_by_reason(hw,
1186 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1189 * If this is for hw restart things are still running.
1190 * We may want to change that later, however.
1192 if (!local->suspended)
1196 /* first set suspended false, then resuming */
1197 local->suspended = false;
1199 local->resuming = false;
1201 list_for_each_entry(sdata, &local->interfaces, list) {
1202 switch(sdata->vif.type) {
1203 case NL80211_IFTYPE_STATION:
1204 ieee80211_sta_restart(sdata);
1206 case NL80211_IFTYPE_ADHOC:
1207 ieee80211_ibss_restart(sdata);
1209 case NL80211_IFTYPE_MESH_POINT:
1210 ieee80211_mesh_restart(sdata);
1217 add_timer(&local->sta_cleanup);
1219 spin_lock_irqsave(&local->sta_lock, flags);
1220 list_for_each_entry(sta, &local->sta_list, list)
1221 mesh_plink_restart(sta);
1222 spin_unlock_irqrestore(&local->sta_lock, flags);
1229 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1230 enum ieee80211_smps_mode *smps_mode)
1232 if (ifmgd->associated) {
1233 *smps_mode = ifmgd->ap_smps;
1235 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1236 if (ifmgd->powersave)
1237 *smps_mode = IEEE80211_SMPS_DYNAMIC;
1239 *smps_mode = IEEE80211_SMPS_OFF;
1248 /* must hold iflist_mtx */
1249 void ieee80211_recalc_smps(struct ieee80211_local *local,
1250 struct ieee80211_sub_if_data *forsdata)
1252 struct ieee80211_sub_if_data *sdata;
1253 enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1257 WARN_ON(!mutex_is_locked(&forsdata->u.mgd.mtx));
1259 WARN_ON(!mutex_is_locked(&local->iflist_mtx));
1262 * This function could be improved to handle multiple
1263 * interfaces better, but right now it makes any
1264 * non-station interfaces force SM PS to be turned
1265 * off. If there are multiple station interfaces it
1266 * could also use the best possible mode, e.g. if
1267 * one is in static and the other in dynamic then
1271 list_for_each_entry(sdata, &local->interfaces, list) {
1272 if (!netif_running(sdata->dev))
1274 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1276 if (sdata != forsdata) {
1278 * This nested is ok -- we are holding the iflist_mtx
1279 * so can't get here twice or so. But it's required
1280 * since normally we acquire it first and then the
1283 mutex_lock_nested(&sdata->u.mgd.mtx, SINGLE_DEPTH_NESTING);
1284 count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1285 mutex_unlock(&sdata->u.mgd.mtx);
1287 count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1290 smps_mode = IEEE80211_SMPS_OFF;
1295 if (smps_mode == local->smps_mode)
1299 local->smps_mode = smps_mode;
1300 /* changed flag is auto-detected for this */
1301 ieee80211_hw_config(local, 0);
1304 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1308 for (i = 0; i < n_ids; i++)
1315 * ieee80211_ie_split - split an IE buffer according to ordering
1317 * @ies: the IE buffer
1318 * @ielen: the length of the IE buffer
1319 * @ids: an array with element IDs that are allowed before
1321 * @n_ids: the size of the element ID array
1322 * @offset: offset where to start splitting in the buffer
1324 * This function splits an IE buffer by updating the @offset
1325 * variable to point to the location where the buffer should be
1328 * It assumes that the given IE buffer is well-formed, this
1329 * has to be guaranteed by the caller!
1331 * It also assumes that the IEs in the buffer are ordered
1332 * correctly, if not the result of using this function will not
1333 * be ordered correctly either, i.e. it does no reordering.
1335 * The function returns the offset where the next part of the
1336 * buffer starts, which may be @ielen if the entire (remainder)
1337 * of the buffer should be used.
1339 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1340 const u8 *ids, int n_ids, size_t offset)
1342 size_t pos = offset;
1344 while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1345 pos += 2 + ies[pos + 1];
1350 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1352 size_t pos = offset;
1354 while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1355 pos += 2 + ies[pos + 1];