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 if (test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
289 netif_wake_subqueue(sdata->dev, queue);
293 tasklet_schedule(&local->tx_pending_tasklet);
296 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
297 enum queue_stop_reason reason)
299 struct ieee80211_local *local = hw_to_local(hw);
302 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
303 __ieee80211_wake_queue(hw, queue, reason);
304 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
307 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
309 ieee80211_wake_queue_by_reason(hw, queue,
310 IEEE80211_QUEUE_STOP_REASON_DRIVER);
312 EXPORT_SYMBOL(ieee80211_wake_queue);
314 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
315 enum queue_stop_reason reason)
317 struct ieee80211_local *local = hw_to_local(hw);
318 struct ieee80211_sub_if_data *sdata;
320 trace_stop_queue(local, queue, reason);
322 if (WARN_ON(queue >= hw->queues))
325 __set_bit(reason, &local->queue_stop_reasons[queue]);
328 list_for_each_entry_rcu(sdata, &local->interfaces, list)
329 netif_stop_subqueue(sdata->dev, queue);
333 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
334 enum queue_stop_reason reason)
336 struct ieee80211_local *local = hw_to_local(hw);
339 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
340 __ieee80211_stop_queue(hw, queue, reason);
341 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
344 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
346 ieee80211_stop_queue_by_reason(hw, queue,
347 IEEE80211_QUEUE_STOP_REASON_DRIVER);
349 EXPORT_SYMBOL(ieee80211_stop_queue);
351 void ieee80211_add_pending_skb(struct ieee80211_local *local,
354 struct ieee80211_hw *hw = &local->hw;
356 int queue = skb_get_queue_mapping(skb);
357 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
359 if (WARN_ON(!info->control.vif)) {
364 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
365 __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
366 __skb_queue_tail(&local->pending[queue], skb);
367 __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
368 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
371 int ieee80211_add_pending_skbs_fn(struct ieee80211_local *local,
372 struct sk_buff_head *skbs,
373 void (*fn)(void *data), void *data)
375 struct ieee80211_hw *hw = &local->hw;
378 int queue, ret = 0, i;
380 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
381 for (i = 0; i < hw->queues; i++)
382 __ieee80211_stop_queue(hw, i,
383 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
385 while ((skb = skb_dequeue(skbs))) {
386 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
388 if (WARN_ON(!info->control.vif)) {
394 queue = skb_get_queue_mapping(skb);
395 __skb_queue_tail(&local->pending[queue], skb);
401 for (i = 0; i < hw->queues; i++)
402 __ieee80211_wake_queue(hw, i,
403 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
404 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
409 int ieee80211_add_pending_skbs(struct ieee80211_local *local,
410 struct sk_buff_head *skbs)
412 return ieee80211_add_pending_skbs_fn(local, skbs, NULL, NULL);
415 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
416 enum queue_stop_reason reason)
418 struct ieee80211_local *local = hw_to_local(hw);
422 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
424 for (i = 0; i < hw->queues; i++)
425 __ieee80211_stop_queue(hw, i, reason);
427 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
430 void ieee80211_stop_queues(struct ieee80211_hw *hw)
432 ieee80211_stop_queues_by_reason(hw,
433 IEEE80211_QUEUE_STOP_REASON_DRIVER);
435 EXPORT_SYMBOL(ieee80211_stop_queues);
437 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
439 struct ieee80211_local *local = hw_to_local(hw);
443 if (WARN_ON(queue >= hw->queues))
446 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
447 ret = !!local->queue_stop_reasons[queue];
448 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
451 EXPORT_SYMBOL(ieee80211_queue_stopped);
453 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
454 enum queue_stop_reason reason)
456 struct ieee80211_local *local = hw_to_local(hw);
460 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
462 for (i = 0; i < hw->queues; i++)
463 __ieee80211_wake_queue(hw, i, reason);
465 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
468 void ieee80211_wake_queues(struct ieee80211_hw *hw)
470 ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
472 EXPORT_SYMBOL(ieee80211_wake_queues);
474 void ieee80211_iterate_active_interfaces(
475 struct ieee80211_hw *hw,
476 void (*iterator)(void *data, u8 *mac,
477 struct ieee80211_vif *vif),
480 struct ieee80211_local *local = hw_to_local(hw);
481 struct ieee80211_sub_if_data *sdata;
483 mutex_lock(&local->iflist_mtx);
485 list_for_each_entry(sdata, &local->interfaces, list) {
486 switch (sdata->vif.type) {
487 case NL80211_IFTYPE_MONITOR:
488 case NL80211_IFTYPE_AP_VLAN:
493 if (ieee80211_sdata_running(sdata))
494 iterator(data, sdata->vif.addr,
498 mutex_unlock(&local->iflist_mtx);
500 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
502 void ieee80211_iterate_active_interfaces_atomic(
503 struct ieee80211_hw *hw,
504 void (*iterator)(void *data, u8 *mac,
505 struct ieee80211_vif *vif),
508 struct ieee80211_local *local = hw_to_local(hw);
509 struct ieee80211_sub_if_data *sdata;
513 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
514 switch (sdata->vif.type) {
515 case NL80211_IFTYPE_MONITOR:
516 case NL80211_IFTYPE_AP_VLAN:
521 if (ieee80211_sdata_running(sdata))
522 iterator(data, sdata->vif.addr,
528 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
531 * Nothing should have been stuffed into the workqueue during
532 * the suspend->resume cycle. If this WARN is seen then there
533 * is a bug with either the driver suspend or something in
534 * mac80211 stuffing into the workqueue which we haven't yet
535 * cleared during mac80211's suspend cycle.
537 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
539 if (WARN(local->suspended && !local->resuming,
540 "queueing ieee80211 work while going to suspend\n"))
546 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
548 struct ieee80211_local *local = hw_to_local(hw);
550 if (!ieee80211_can_queue_work(local))
553 queue_work(local->workqueue, work);
555 EXPORT_SYMBOL(ieee80211_queue_work);
557 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
558 struct delayed_work *dwork,
561 struct ieee80211_local *local = hw_to_local(hw);
563 if (!ieee80211_can_queue_work(local))
566 queue_delayed_work(local->workqueue, dwork, delay);
568 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
570 void ieee802_11_parse_elems(u8 *start, size_t len,
571 struct ieee802_11_elems *elems)
573 ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
576 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
577 struct ieee802_11_elems *elems,
582 bool calc_crc = filter != 0;
584 memset(elems, 0, sizeof(*elems));
585 elems->ie_start = start;
586 elems->total_len = len;
598 if (calc_crc && id < 64 && (filter & (1ULL << id)))
599 crc = crc32_be(crc, pos - 2, elen + 2);
604 elems->ssid_len = elen;
606 case WLAN_EID_SUPP_RATES:
607 elems->supp_rates = pos;
608 elems->supp_rates_len = elen;
610 case WLAN_EID_FH_PARAMS:
611 elems->fh_params = pos;
612 elems->fh_params_len = elen;
614 case WLAN_EID_DS_PARAMS:
615 elems->ds_params = pos;
616 elems->ds_params_len = elen;
618 case WLAN_EID_CF_PARAMS:
619 elems->cf_params = pos;
620 elems->cf_params_len = elen;
623 if (elen >= sizeof(struct ieee80211_tim_ie)) {
624 elems->tim = (void *)pos;
625 elems->tim_len = elen;
628 case WLAN_EID_IBSS_PARAMS:
629 elems->ibss_params = pos;
630 elems->ibss_params_len = elen;
632 case WLAN_EID_CHALLENGE:
633 elems->challenge = pos;
634 elems->challenge_len = elen;
636 case WLAN_EID_VENDOR_SPECIFIC:
637 if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
639 /* Microsoft OUI (00:50:F2) */
642 crc = crc32_be(crc, pos - 2, elen + 2);
645 /* OUI Type 1 - WPA IE */
647 elems->wpa_len = elen;
648 } else if (elen >= 5 && pos[3] == 2) {
649 /* OUI Type 2 - WMM IE */
651 elems->wmm_info = pos;
652 elems->wmm_info_len = elen;
653 } else if (pos[4] == 1) {
654 elems->wmm_param = pos;
655 elems->wmm_param_len = elen;
662 elems->rsn_len = elen;
664 case WLAN_EID_ERP_INFO:
665 elems->erp_info = pos;
666 elems->erp_info_len = elen;
668 case WLAN_EID_EXT_SUPP_RATES:
669 elems->ext_supp_rates = pos;
670 elems->ext_supp_rates_len = elen;
672 case WLAN_EID_HT_CAPABILITY:
673 if (elen >= sizeof(struct ieee80211_ht_cap))
674 elems->ht_cap_elem = (void *)pos;
676 case WLAN_EID_HT_INFORMATION:
677 if (elen >= sizeof(struct ieee80211_ht_info))
678 elems->ht_info_elem = (void *)pos;
680 case WLAN_EID_MESH_ID:
681 elems->mesh_id = pos;
682 elems->mesh_id_len = elen;
684 case WLAN_EID_MESH_CONFIG:
685 if (elen >= sizeof(struct ieee80211_meshconf_ie))
686 elems->mesh_config = (void *)pos;
688 case WLAN_EID_PEER_LINK:
689 elems->peer_link = pos;
690 elems->peer_link_len = elen;
694 elems->preq_len = elen;
698 elems->prep_len = elen;
702 elems->perr_len = elen;
705 if (elen >= sizeof(struct ieee80211_rann_ie))
706 elems->rann = (void *)pos;
708 case WLAN_EID_CHANNEL_SWITCH:
709 elems->ch_switch_elem = pos;
710 elems->ch_switch_elem_len = elen;
713 if (!elems->quiet_elem) {
714 elems->quiet_elem = pos;
715 elems->quiet_elem_len = elen;
717 elems->num_of_quiet_elem++;
719 case WLAN_EID_COUNTRY:
720 elems->country_elem = pos;
721 elems->country_elem_len = elen;
723 case WLAN_EID_PWR_CONSTRAINT:
724 elems->pwr_constr_elem = pos;
725 elems->pwr_constr_elem_len = elen;
727 case WLAN_EID_TIMEOUT_INTERVAL:
728 elems->timeout_int = pos;
729 elems->timeout_int_len = elen;
742 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
744 struct ieee80211_local *local = sdata->local;
745 struct ieee80211_tx_queue_params qparam;
750 if (!local->ops->conf_tx)
753 memset(&qparam, 0, sizeof(qparam));
755 use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
756 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
758 for (queue = 0; queue < local_to_hw(local)->queues; queue++) {
759 /* Set defaults according to 802.11-2007 Table 7-37 */
768 qparam.cw_max = aCWmax;
769 qparam.cw_min = aCWmin;
773 default: /* never happens but let's not leave undefined */
775 qparam.cw_max = aCWmax;
776 qparam.cw_min = aCWmin;
781 qparam.cw_max = aCWmin;
782 qparam.cw_min = (aCWmin + 1) / 2 - 1;
784 qparam.txop = 6016/32;
786 qparam.txop = 3008/32;
790 qparam.cw_max = (aCWmin + 1) / 2 - 1;
791 qparam.cw_min = (aCWmin + 1) / 4 - 1;
793 qparam.txop = 3264/32;
795 qparam.txop = 1504/32;
800 qparam.uapsd = false;
802 drv_conf_tx(local, queue, &qparam);
805 /* after reinitialize QoS TX queues setting to default,
806 * disable QoS at all */
808 if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
809 sdata->vif.bss_conf.qos =
810 sdata->vif.type != NL80211_IFTYPE_STATION;
811 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
815 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
816 const size_t supp_rates_len,
817 const u8 *supp_rates)
819 struct ieee80211_local *local = sdata->local;
820 int i, have_higher_than_11mbit = 0;
822 /* cf. IEEE 802.11 9.2.12 */
823 for (i = 0; i < supp_rates_len; i++)
824 if ((supp_rates[i] & 0x7f) * 5 > 110)
825 have_higher_than_11mbit = 1;
827 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
828 have_higher_than_11mbit)
829 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
831 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
833 ieee80211_set_wmm_default(sdata);
836 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
837 enum ieee80211_band band)
839 struct ieee80211_supported_band *sband;
840 struct ieee80211_rate *bitrates;
842 enum ieee80211_rate_flags mandatory_flag;
845 sband = local->hw.wiphy->bands[band];
848 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
851 if (band == IEEE80211_BAND_2GHZ)
852 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
854 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
856 bitrates = sband->bitrates;
858 for (i = 0; i < sband->n_bitrates; i++)
859 if (bitrates[i].flags & mandatory_flag)
860 mandatory_rates |= BIT(i);
861 return mandatory_rates;
864 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
865 u16 transaction, u16 auth_alg,
866 u8 *extra, size_t extra_len, const u8 *bssid,
867 const u8 *key, u8 key_len, u8 key_idx)
869 struct ieee80211_local *local = sdata->local;
871 struct ieee80211_mgmt *mgmt;
874 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
875 sizeof(*mgmt) + 6 + extra_len);
877 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
878 "frame\n", sdata->name);
881 skb_reserve(skb, local->hw.extra_tx_headroom);
883 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
884 memset(mgmt, 0, 24 + 6);
885 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
886 IEEE80211_STYPE_AUTH);
887 memcpy(mgmt->da, bssid, ETH_ALEN);
888 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
889 memcpy(mgmt->bssid, bssid, ETH_ALEN);
890 mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
891 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
892 mgmt->u.auth.status_code = cpu_to_le16(0);
894 memcpy(skb_put(skb, extra_len), extra, extra_len);
896 if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
897 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
898 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
902 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
903 ieee80211_tx_skb(sdata, skb);
906 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
907 const u8 *ie, size_t ie_len,
908 enum ieee80211_band band, u32 rate_mask,
911 struct ieee80211_supported_band *sband;
913 size_t offset = 0, noffset;
914 int supp_rates_len, i;
919 sband = local->hw.wiphy->bands[band];
924 for (i = 0; i < sband->n_bitrates; i++) {
925 if ((BIT(i) & rate_mask) == 0)
926 continue; /* skip rate */
927 rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
930 supp_rates_len = min_t(int, num_rates, 8);
932 *pos++ = WLAN_EID_SUPP_RATES;
933 *pos++ = supp_rates_len;
934 memcpy(pos, rates, supp_rates_len);
935 pos += supp_rates_len;
937 /* insert "request information" if in custom IEs */
939 static const u8 before_extrates[] = {
944 noffset = ieee80211_ie_split(ie, ie_len,
946 ARRAY_SIZE(before_extrates),
948 memcpy(pos, ie + offset, noffset - offset);
949 pos += noffset - offset;
953 ext_rates_len = num_rates - supp_rates_len;
954 if (ext_rates_len > 0) {
955 *pos++ = WLAN_EID_EXT_SUPP_RATES;
956 *pos++ = ext_rates_len;
957 memcpy(pos, rates + supp_rates_len, ext_rates_len);
958 pos += ext_rates_len;
961 if (channel && sband->band == IEEE80211_BAND_2GHZ) {
962 *pos++ = WLAN_EID_DS_PARAMS;
967 /* insert custom IEs that go before HT */
969 static const u8 before_ht[] = {
973 WLAN_EID_EXT_SUPP_RATES,
975 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
977 noffset = ieee80211_ie_split(ie, ie_len,
978 before_ht, ARRAY_SIZE(before_ht),
980 memcpy(pos, ie + offset, noffset - offset);
981 pos += noffset - offset;
985 if (sband->ht_cap.ht_supported) {
986 u16 cap = sband->ht_cap.cap;
989 *pos++ = WLAN_EID_HT_CAPABILITY;
990 *pos++ = sizeof(struct ieee80211_ht_cap);
991 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
992 tmp = cpu_to_le16(cap);
993 memcpy(pos, &tmp, sizeof(u16));
995 *pos++ = sband->ht_cap.ampdu_factor |
996 (sband->ht_cap.ampdu_density <<
997 IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
998 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
999 pos += sizeof(sband->ht_cap.mcs);
1000 pos += 2 + 4 + 1; /* ext info, BF cap, antsel */
1004 * If adding more here, adjust code in main.c
1005 * that calculates local->scan_ies_len.
1008 /* add any remaining custom IEs */
1011 memcpy(pos, ie + offset, noffset - offset);
1012 pos += noffset - offset;
1015 return pos - buffer;
1018 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1020 const u8 *ssid, size_t ssid_len,
1021 const u8 *ie, size_t ie_len)
1023 struct ieee80211_local *local = sdata->local;
1024 struct sk_buff *skb;
1025 struct ieee80211_mgmt *mgmt;
1030 /* FIXME: come up with a proper value */
1031 buf = kmalloc(200 + ie_len, GFP_KERNEL);
1033 printk(KERN_DEBUG "%s: failed to allocate temporary IE "
1034 "buffer\n", sdata->name);
1038 chan = ieee80211_frequency_to_channel(
1039 local->hw.conf.channel->center_freq);
1041 buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len,
1042 local->hw.conf.channel->band,
1043 sdata->rc_rateidx_mask
1044 [local->hw.conf.channel->band],
1047 skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1054 mgmt = (struct ieee80211_mgmt *) skb->data;
1055 memcpy(mgmt->da, dst, ETH_ALEN);
1056 memcpy(mgmt->bssid, dst, ETH_ALEN);
1059 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1067 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1068 const u8 *ssid, size_t ssid_len,
1069 const u8 *ie, size_t ie_len)
1071 struct sk_buff *skb;
1073 skb = ieee80211_build_probe_req(sdata, dst, ssid, ssid_len, ie, ie_len);
1075 ieee80211_tx_skb(sdata, skb);
1078 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1079 struct ieee802_11_elems *elems,
1080 enum ieee80211_band band)
1082 struct ieee80211_supported_band *sband;
1083 struct ieee80211_rate *bitrates;
1087 sband = local->hw.wiphy->bands[band];
1091 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1094 bitrates = sband->bitrates;
1095 num_rates = sband->n_bitrates;
1097 for (i = 0; i < elems->supp_rates_len +
1098 elems->ext_supp_rates_len; i++) {
1101 if (i < elems->supp_rates_len)
1102 rate = elems->supp_rates[i];
1103 else if (elems->ext_supp_rates)
1104 rate = elems->ext_supp_rates
1105 [i - elems->supp_rates_len];
1106 own_rate = 5 * (rate & 0x7f);
1107 for (j = 0; j < num_rates; j++)
1108 if (bitrates[j].bitrate == own_rate)
1109 supp_rates |= BIT(j);
1114 void ieee80211_stop_device(struct ieee80211_local *local)
1116 ieee80211_led_radio(local, false);
1117 ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1119 cancel_work_sync(&local->reconfig_filter);
1121 flush_workqueue(local->workqueue);
1125 int ieee80211_reconfig(struct ieee80211_local *local)
1127 struct ieee80211_hw *hw = &local->hw;
1128 struct ieee80211_sub_if_data *sdata;
1129 struct sta_info *sta;
1133 if (local->suspended)
1134 local->resuming = true;
1136 if (local->wowlan) {
1137 local->wowlan = false;
1138 res = drv_resume(local);
1140 local->resuming = false;
1147 * res is 1, which means the driver requested
1148 * to go through a regular reset on wakeup.
1153 /* restart hardware */
1154 if (local->open_count) {
1156 * Upon resume hardware can sometimes be goofy due to
1157 * various platform / driver / bus issues, so restarting
1158 * the device may at times not work immediately. Propagate
1161 res = drv_start(local);
1163 WARN(local->suspended, "Hardware became unavailable "
1164 "upon resume. This could be a software issue "
1165 "prior to suspend or a hardware issue.\n");
1169 ieee80211_led_radio(local, true);
1170 ieee80211_mod_tpt_led_trig(local,
1171 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1174 /* add interfaces */
1175 list_for_each_entry(sdata, &local->interfaces, list) {
1176 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1177 sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1178 ieee80211_sdata_running(sdata))
1179 res = drv_add_interface(local, &sdata->vif);
1183 mutex_lock(&local->sta_mtx);
1184 list_for_each_entry(sta, &local->sta_list, list) {
1185 if (sta->uploaded) {
1187 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1188 sdata = container_of(sdata->bss,
1189 struct ieee80211_sub_if_data,
1192 WARN_ON(drv_sta_add(local, sdata, &sta->sta));
1195 mutex_unlock(&local->sta_mtx);
1197 /* setup fragmentation threshold */
1198 drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1200 /* setup RTS threshold */
1201 drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1203 /* reconfigure hardware */
1204 ieee80211_hw_config(local, ~0);
1206 ieee80211_configure_filter(local);
1208 /* Finally also reconfigure all the BSS information */
1209 list_for_each_entry(sdata, &local->interfaces, list) {
1212 if (!ieee80211_sdata_running(sdata))
1215 /* common change flags for all interface types */
1216 changed = BSS_CHANGED_ERP_CTS_PROT |
1217 BSS_CHANGED_ERP_PREAMBLE |
1218 BSS_CHANGED_ERP_SLOT |
1220 BSS_CHANGED_BASIC_RATES |
1221 BSS_CHANGED_BEACON_INT |
1226 switch (sdata->vif.type) {
1227 case NL80211_IFTYPE_STATION:
1228 changed |= BSS_CHANGED_ASSOC;
1229 mutex_lock(&sdata->u.mgd.mtx);
1230 ieee80211_bss_info_change_notify(sdata, changed);
1231 mutex_unlock(&sdata->u.mgd.mtx);
1233 case NL80211_IFTYPE_ADHOC:
1234 changed |= BSS_CHANGED_IBSS;
1236 case NL80211_IFTYPE_AP:
1237 case NL80211_IFTYPE_MESH_POINT:
1238 changed |= BSS_CHANGED_BEACON |
1239 BSS_CHANGED_BEACON_ENABLED;
1240 ieee80211_bss_info_change_notify(sdata, changed);
1242 case NL80211_IFTYPE_WDS:
1244 case NL80211_IFTYPE_AP_VLAN:
1245 case NL80211_IFTYPE_MONITOR:
1246 /* ignore virtual */
1248 case NL80211_IFTYPE_UNSPECIFIED:
1249 case NUM_NL80211_IFTYPES:
1250 case NL80211_IFTYPE_P2P_CLIENT:
1251 case NL80211_IFTYPE_P2P_GO:
1258 * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1259 * sessions can be established after a resume.
1261 * Also tear down aggregation sessions since reconfiguring
1262 * them in a hardware restart scenario is not easily done
1263 * right now, and the hardware will have lost information
1264 * about the sessions, but we and the AP still think they
1265 * are active. This is really a workaround though.
1267 if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1268 mutex_lock(&local->sta_mtx);
1270 list_for_each_entry(sta, &local->sta_list, list) {
1271 ieee80211_sta_tear_down_BA_sessions(sta, true);
1272 clear_sta_flags(sta, WLAN_STA_BLOCK_BA);
1275 mutex_unlock(&local->sta_mtx);
1279 list_for_each_entry(sdata, &local->interfaces, list)
1280 if (ieee80211_sdata_running(sdata))
1281 ieee80211_enable_keys(sdata);
1284 ieee80211_wake_queues_by_reason(hw,
1285 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1288 * If this is for hw restart things are still running.
1289 * We may want to change that later, however.
1291 if (!local->suspended)
1295 /* first set suspended false, then resuming */
1296 local->suspended = false;
1298 local->resuming = false;
1300 list_for_each_entry(sdata, &local->interfaces, list) {
1301 switch(sdata->vif.type) {
1302 case NL80211_IFTYPE_STATION:
1303 ieee80211_sta_restart(sdata);
1305 case NL80211_IFTYPE_ADHOC:
1306 ieee80211_ibss_restart(sdata);
1308 case NL80211_IFTYPE_MESH_POINT:
1309 ieee80211_mesh_restart(sdata);
1316 mod_timer(&local->sta_cleanup, jiffies + 1);
1318 mutex_lock(&local->sta_mtx);
1319 list_for_each_entry(sta, &local->sta_list, list)
1320 mesh_plink_restart(sta);
1321 mutex_unlock(&local->sta_mtx);
1328 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1329 enum ieee80211_smps_mode *smps_mode)
1331 if (ifmgd->associated) {
1332 *smps_mode = ifmgd->ap_smps;
1334 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1335 if (ifmgd->powersave)
1336 *smps_mode = IEEE80211_SMPS_DYNAMIC;
1338 *smps_mode = IEEE80211_SMPS_OFF;
1347 /* must hold iflist_mtx */
1348 void ieee80211_recalc_smps(struct ieee80211_local *local)
1350 struct ieee80211_sub_if_data *sdata;
1351 enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1354 lockdep_assert_held(&local->iflist_mtx);
1357 * This function could be improved to handle multiple
1358 * interfaces better, but right now it makes any
1359 * non-station interfaces force SM PS to be turned
1360 * off. If there are multiple station interfaces it
1361 * could also use the best possible mode, e.g. if
1362 * one is in static and the other in dynamic then
1366 list_for_each_entry(sdata, &local->interfaces, list) {
1367 if (!ieee80211_sdata_running(sdata))
1369 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1372 count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1375 smps_mode = IEEE80211_SMPS_OFF;
1380 if (smps_mode == local->smps_mode)
1384 local->smps_mode = smps_mode;
1385 /* changed flag is auto-detected for this */
1386 ieee80211_hw_config(local, 0);
1389 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1393 for (i = 0; i < n_ids; i++)
1400 * ieee80211_ie_split - split an IE buffer according to ordering
1402 * @ies: the IE buffer
1403 * @ielen: the length of the IE buffer
1404 * @ids: an array with element IDs that are allowed before
1406 * @n_ids: the size of the element ID array
1407 * @offset: offset where to start splitting in the buffer
1409 * This function splits an IE buffer by updating the @offset
1410 * variable to point to the location where the buffer should be
1413 * It assumes that the given IE buffer is well-formed, this
1414 * has to be guaranteed by the caller!
1416 * It also assumes that the IEs in the buffer are ordered
1417 * correctly, if not the result of using this function will not
1418 * be ordered correctly either, i.e. it does no reordering.
1420 * The function returns the offset where the next part of the
1421 * buffer starts, which may be @ielen if the entire (remainder)
1422 * of the buffer should be used.
1424 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1425 const u8 *ids, int n_ids, size_t offset)
1427 size_t pos = offset;
1429 while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1430 pos += 2 + ies[pos + 1];
1435 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1437 size_t pos = offset;
1439 while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1440 pos += 2 + ies[pos + 1];