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(struct ieee80211_local *local,
372 struct sk_buff_head *skbs)
374 struct ieee80211_hw *hw = &local->hw;
377 int queue, ret = 0, i;
379 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
380 for (i = 0; i < hw->queues; i++)
381 __ieee80211_stop_queue(hw, i,
382 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
384 while ((skb = skb_dequeue(skbs))) {
385 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
387 if (WARN_ON(!info->control.vif)) {
393 queue = skb_get_queue_mapping(skb);
394 __skb_queue_tail(&local->pending[queue], skb);
397 for (i = 0; i < hw->queues; i++)
398 __ieee80211_wake_queue(hw, i,
399 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
400 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
405 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
406 enum queue_stop_reason reason)
408 struct ieee80211_local *local = hw_to_local(hw);
412 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
414 for (i = 0; i < hw->queues; i++)
415 __ieee80211_stop_queue(hw, i, reason);
417 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
420 void ieee80211_stop_queues(struct ieee80211_hw *hw)
422 ieee80211_stop_queues_by_reason(hw,
423 IEEE80211_QUEUE_STOP_REASON_DRIVER);
425 EXPORT_SYMBOL(ieee80211_stop_queues);
427 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
429 struct ieee80211_local *local = hw_to_local(hw);
433 if (WARN_ON(queue >= hw->queues))
436 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
437 ret = !!local->queue_stop_reasons[queue];
438 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
441 EXPORT_SYMBOL(ieee80211_queue_stopped);
443 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
444 enum queue_stop_reason reason)
446 struct ieee80211_local *local = hw_to_local(hw);
450 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
452 for (i = 0; i < hw->queues; i++)
453 __ieee80211_wake_queue(hw, i, reason);
455 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
458 void ieee80211_wake_queues(struct ieee80211_hw *hw)
460 ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
462 EXPORT_SYMBOL(ieee80211_wake_queues);
464 void ieee80211_iterate_active_interfaces(
465 struct ieee80211_hw *hw,
466 void (*iterator)(void *data, u8 *mac,
467 struct ieee80211_vif *vif),
470 struct ieee80211_local *local = hw_to_local(hw);
471 struct ieee80211_sub_if_data *sdata;
473 mutex_lock(&local->iflist_mtx);
475 list_for_each_entry(sdata, &local->interfaces, list) {
476 switch (sdata->vif.type) {
477 case NL80211_IFTYPE_MONITOR:
478 case NL80211_IFTYPE_AP_VLAN:
483 if (ieee80211_sdata_running(sdata))
484 iterator(data, sdata->vif.addr,
488 mutex_unlock(&local->iflist_mtx);
490 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
492 void ieee80211_iterate_active_interfaces_atomic(
493 struct ieee80211_hw *hw,
494 void (*iterator)(void *data, u8 *mac,
495 struct ieee80211_vif *vif),
498 struct ieee80211_local *local = hw_to_local(hw);
499 struct ieee80211_sub_if_data *sdata;
503 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
504 switch (sdata->vif.type) {
505 case NL80211_IFTYPE_MONITOR:
506 case NL80211_IFTYPE_AP_VLAN:
511 if (ieee80211_sdata_running(sdata))
512 iterator(data, sdata->vif.addr,
518 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
521 * Nothing should have been stuffed into the workqueue during
522 * the suspend->resume cycle. If this WARN is seen then there
523 * is a bug with either the driver suspend or something in
524 * mac80211 stuffing into the workqueue which we haven't yet
525 * cleared during mac80211's suspend cycle.
527 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
529 if (WARN(local->suspended && !local->resuming,
530 "queueing ieee80211 work while going to suspend\n"))
536 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
538 struct ieee80211_local *local = hw_to_local(hw);
540 if (!ieee80211_can_queue_work(local))
543 queue_work(local->workqueue, work);
545 EXPORT_SYMBOL(ieee80211_queue_work);
547 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
548 struct delayed_work *dwork,
551 struct ieee80211_local *local = hw_to_local(hw);
553 if (!ieee80211_can_queue_work(local))
556 queue_delayed_work(local->workqueue, dwork, delay);
558 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
560 void ieee802_11_parse_elems(u8 *start, size_t len,
561 struct ieee802_11_elems *elems)
563 ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
566 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
567 struct ieee802_11_elems *elems,
572 bool calc_crc = filter != 0;
574 memset(elems, 0, sizeof(*elems));
575 elems->ie_start = start;
576 elems->total_len = len;
588 if (calc_crc && id < 64 && (filter & (1ULL << id)))
589 crc = crc32_be(crc, pos - 2, elen + 2);
594 elems->ssid_len = elen;
596 case WLAN_EID_SUPP_RATES:
597 elems->supp_rates = pos;
598 elems->supp_rates_len = elen;
600 case WLAN_EID_FH_PARAMS:
601 elems->fh_params = pos;
602 elems->fh_params_len = elen;
604 case WLAN_EID_DS_PARAMS:
605 elems->ds_params = pos;
606 elems->ds_params_len = elen;
608 case WLAN_EID_CF_PARAMS:
609 elems->cf_params = pos;
610 elems->cf_params_len = elen;
613 if (elen >= sizeof(struct ieee80211_tim_ie)) {
614 elems->tim = (void *)pos;
615 elems->tim_len = elen;
618 case WLAN_EID_IBSS_PARAMS:
619 elems->ibss_params = pos;
620 elems->ibss_params_len = elen;
622 case WLAN_EID_CHALLENGE:
623 elems->challenge = pos;
624 elems->challenge_len = elen;
626 case WLAN_EID_VENDOR_SPECIFIC:
627 if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
629 /* Microsoft OUI (00:50:F2) */
632 crc = crc32_be(crc, pos - 2, elen + 2);
635 /* OUI Type 1 - WPA IE */
637 elems->wpa_len = elen;
638 } else if (elen >= 5 && pos[3] == 2) {
639 /* OUI Type 2 - WMM IE */
641 elems->wmm_info = pos;
642 elems->wmm_info_len = elen;
643 } else if (pos[4] == 1) {
644 elems->wmm_param = pos;
645 elems->wmm_param_len = elen;
652 elems->rsn_len = elen;
654 case WLAN_EID_ERP_INFO:
655 elems->erp_info = pos;
656 elems->erp_info_len = elen;
658 case WLAN_EID_EXT_SUPP_RATES:
659 elems->ext_supp_rates = pos;
660 elems->ext_supp_rates_len = elen;
662 case WLAN_EID_HT_CAPABILITY:
663 if (elen >= sizeof(struct ieee80211_ht_cap))
664 elems->ht_cap_elem = (void *)pos;
666 case WLAN_EID_HT_INFORMATION:
667 if (elen >= sizeof(struct ieee80211_ht_info))
668 elems->ht_info_elem = (void *)pos;
670 case WLAN_EID_MESH_ID:
671 elems->mesh_id = pos;
672 elems->mesh_id_len = elen;
674 case WLAN_EID_MESH_CONFIG:
675 if (elen >= sizeof(struct ieee80211_meshconf_ie))
676 elems->mesh_config = (void *)pos;
678 case WLAN_EID_PEER_LINK:
679 elems->peer_link = pos;
680 elems->peer_link_len = elen;
684 elems->preq_len = elen;
688 elems->prep_len = elen;
692 elems->perr_len = elen;
695 if (elen >= sizeof(struct ieee80211_rann_ie))
696 elems->rann = (void *)pos;
698 case WLAN_EID_CHANNEL_SWITCH:
699 elems->ch_switch_elem = pos;
700 elems->ch_switch_elem_len = elen;
703 if (!elems->quiet_elem) {
704 elems->quiet_elem = pos;
705 elems->quiet_elem_len = elen;
707 elems->num_of_quiet_elem++;
709 case WLAN_EID_COUNTRY:
710 elems->country_elem = pos;
711 elems->country_elem_len = elen;
713 case WLAN_EID_PWR_CONSTRAINT:
714 elems->pwr_constr_elem = pos;
715 elems->pwr_constr_elem_len = elen;
717 case WLAN_EID_TIMEOUT_INTERVAL:
718 elems->timeout_int = pos;
719 elems->timeout_int_len = elen;
732 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
734 struct ieee80211_local *local = sdata->local;
735 struct ieee80211_tx_queue_params qparam;
740 if (!local->ops->conf_tx)
743 memset(&qparam, 0, sizeof(qparam));
745 use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
746 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
748 for (queue = 0; queue < local_to_hw(local)->queues; queue++) {
749 /* Set defaults according to 802.11-2007 Table 7-37 */
758 qparam.cw_max = aCWmax;
759 qparam.cw_min = aCWmin;
763 default: /* never happens but let's not leave undefined */
765 qparam.cw_max = aCWmax;
766 qparam.cw_min = aCWmin;
771 qparam.cw_max = aCWmin;
772 qparam.cw_min = (aCWmin + 1) / 2 - 1;
774 qparam.txop = 6016/32;
776 qparam.txop = 3008/32;
780 qparam.cw_max = (aCWmin + 1) / 2 - 1;
781 qparam.cw_min = (aCWmin + 1) / 4 - 1;
783 qparam.txop = 3264/32;
785 qparam.txop = 1504/32;
790 qparam.uapsd = false;
792 drv_conf_tx(local, queue, &qparam);
795 /* after reinitialize QoS TX queues setting to default,
796 * disable QoS at all */
798 if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
799 sdata->vif.bss_conf.qos =
800 sdata->vif.type != NL80211_IFTYPE_STATION;
801 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
805 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
806 const size_t supp_rates_len,
807 const u8 *supp_rates)
809 struct ieee80211_local *local = sdata->local;
810 int i, have_higher_than_11mbit = 0;
812 /* cf. IEEE 802.11 9.2.12 */
813 for (i = 0; i < supp_rates_len; i++)
814 if ((supp_rates[i] & 0x7f) * 5 > 110)
815 have_higher_than_11mbit = 1;
817 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
818 have_higher_than_11mbit)
819 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
821 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
823 ieee80211_set_wmm_default(sdata);
826 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
827 enum ieee80211_band band)
829 struct ieee80211_supported_band *sband;
830 struct ieee80211_rate *bitrates;
832 enum ieee80211_rate_flags mandatory_flag;
835 sband = local->hw.wiphy->bands[band];
838 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
841 if (band == IEEE80211_BAND_2GHZ)
842 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
844 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
846 bitrates = sband->bitrates;
848 for (i = 0; i < sband->n_bitrates; i++)
849 if (bitrates[i].flags & mandatory_flag)
850 mandatory_rates |= BIT(i);
851 return mandatory_rates;
854 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
855 u16 transaction, u16 auth_alg,
856 u8 *extra, size_t extra_len, const u8 *bssid,
857 const u8 *key, u8 key_len, u8 key_idx)
859 struct ieee80211_local *local = sdata->local;
861 struct ieee80211_mgmt *mgmt;
864 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
865 sizeof(*mgmt) + 6 + extra_len);
867 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
868 "frame\n", sdata->name);
871 skb_reserve(skb, local->hw.extra_tx_headroom);
873 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
874 memset(mgmt, 0, 24 + 6);
875 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
876 IEEE80211_STYPE_AUTH);
877 memcpy(mgmt->da, bssid, ETH_ALEN);
878 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
879 memcpy(mgmt->bssid, bssid, ETH_ALEN);
880 mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
881 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
882 mgmt->u.auth.status_code = cpu_to_le16(0);
884 memcpy(skb_put(skb, extra_len), extra, extra_len);
886 if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
887 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
888 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
892 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
893 ieee80211_tx_skb(sdata, skb);
896 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
897 const u8 *ie, size_t ie_len,
898 enum ieee80211_band band, u32 rate_mask,
901 struct ieee80211_supported_band *sband;
903 size_t offset = 0, noffset;
904 int supp_rates_len, i;
909 sband = local->hw.wiphy->bands[band];
914 for (i = 0; i < sband->n_bitrates; i++) {
915 if ((BIT(i) & rate_mask) == 0)
916 continue; /* skip rate */
917 rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
920 supp_rates_len = min_t(int, num_rates, 8);
922 *pos++ = WLAN_EID_SUPP_RATES;
923 *pos++ = supp_rates_len;
924 memcpy(pos, rates, supp_rates_len);
925 pos += supp_rates_len;
927 /* insert "request information" if in custom IEs */
929 static const u8 before_extrates[] = {
934 noffset = ieee80211_ie_split(ie, ie_len,
936 ARRAY_SIZE(before_extrates),
938 memcpy(pos, ie + offset, noffset - offset);
939 pos += noffset - offset;
943 ext_rates_len = num_rates - supp_rates_len;
944 if (ext_rates_len > 0) {
945 *pos++ = WLAN_EID_EXT_SUPP_RATES;
946 *pos++ = ext_rates_len;
947 memcpy(pos, rates + supp_rates_len, ext_rates_len);
948 pos += ext_rates_len;
951 if (channel && sband->band == IEEE80211_BAND_2GHZ) {
952 *pos++ = WLAN_EID_DS_PARAMS;
957 /* insert custom IEs that go before HT */
959 static const u8 before_ht[] = {
963 WLAN_EID_EXT_SUPP_RATES,
965 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
967 noffset = ieee80211_ie_split(ie, ie_len,
968 before_ht, ARRAY_SIZE(before_ht),
970 memcpy(pos, ie + offset, noffset - offset);
971 pos += noffset - offset;
975 if (sband->ht_cap.ht_supported) {
976 u16 cap = sband->ht_cap.cap;
979 if (ieee80211_disable_40mhz_24ghz &&
980 sband->band == IEEE80211_BAND_2GHZ) {
981 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
982 cap &= ~IEEE80211_HT_CAP_SGI_40;
985 *pos++ = WLAN_EID_HT_CAPABILITY;
986 *pos++ = sizeof(struct ieee80211_ht_cap);
987 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
988 tmp = cpu_to_le16(cap);
989 memcpy(pos, &tmp, sizeof(u16));
991 *pos++ = sband->ht_cap.ampdu_factor |
992 (sband->ht_cap.ampdu_density <<
993 IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
994 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
995 pos += sizeof(sband->ht_cap.mcs);
996 pos += 2 + 4 + 1; /* ext info, BF cap, antsel */
1000 * If adding more here, adjust code in main.c
1001 * that calculates local->scan_ies_len.
1004 /* add any remaining custom IEs */
1007 memcpy(pos, ie + offset, noffset - offset);
1008 pos += noffset - offset;
1011 return pos - buffer;
1014 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1015 const u8 *ssid, size_t ssid_len,
1016 const u8 *ie, size_t ie_len)
1018 struct ieee80211_local *local = sdata->local;
1019 struct sk_buff *skb;
1020 struct ieee80211_mgmt *mgmt;
1025 /* FIXME: come up with a proper value */
1026 buf = kmalloc(200 + ie_len, GFP_KERNEL);
1028 printk(KERN_DEBUG "%s: failed to allocate temporary IE "
1029 "buffer\n", sdata->name);
1033 chan = ieee80211_frequency_to_channel(
1034 local->hw.conf.channel->center_freq);
1036 buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len,
1037 local->hw.conf.channel->band,
1038 sdata->rc_rateidx_mask
1039 [local->hw.conf.channel->band],
1042 skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1047 mgmt = (struct ieee80211_mgmt *) skb->data;
1048 memcpy(mgmt->da, dst, ETH_ALEN);
1049 memcpy(mgmt->bssid, dst, ETH_ALEN);
1052 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1053 ieee80211_tx_skb(sdata, skb);
1057 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1058 struct ieee802_11_elems *elems,
1059 enum ieee80211_band band)
1061 struct ieee80211_supported_band *sband;
1062 struct ieee80211_rate *bitrates;
1066 sband = local->hw.wiphy->bands[band];
1070 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1073 bitrates = sband->bitrates;
1074 num_rates = sband->n_bitrates;
1076 for (i = 0; i < elems->supp_rates_len +
1077 elems->ext_supp_rates_len; i++) {
1080 if (i < elems->supp_rates_len)
1081 rate = elems->supp_rates[i];
1082 else if (elems->ext_supp_rates)
1083 rate = elems->ext_supp_rates
1084 [i - elems->supp_rates_len];
1085 own_rate = 5 * (rate & 0x7f);
1086 for (j = 0; j < num_rates; j++)
1087 if (bitrates[j].bitrate == own_rate)
1088 supp_rates |= BIT(j);
1093 void ieee80211_stop_device(struct ieee80211_local *local)
1095 ieee80211_led_radio(local, false);
1097 cancel_work_sync(&local->reconfig_filter);
1099 flush_workqueue(local->workqueue);
1103 int ieee80211_reconfig(struct ieee80211_local *local)
1105 struct ieee80211_hw *hw = &local->hw;
1106 struct ieee80211_sub_if_data *sdata;
1107 struct sta_info *sta;
1110 if (local->suspended)
1111 local->resuming = true;
1113 /* restart hardware */
1114 if (local->open_count) {
1116 * Upon resume hardware can sometimes be goofy due to
1117 * various platform / driver / bus issues, so restarting
1118 * the device may at times not work immediately. Propagate
1121 res = drv_start(local);
1123 WARN(local->suspended, "Hardware became unavailable "
1124 "upon resume. This could be a software issue "
1125 "prior to suspend or a hardware issue.\n");
1129 ieee80211_led_radio(local, true);
1132 /* add interfaces */
1133 list_for_each_entry(sdata, &local->interfaces, list) {
1134 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1135 sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1136 ieee80211_sdata_running(sdata))
1137 res = drv_add_interface(local, &sdata->vif);
1141 mutex_lock(&local->sta_mtx);
1142 list_for_each_entry(sta, &local->sta_list, list) {
1143 if (sta->uploaded) {
1145 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1146 sdata = container_of(sdata->bss,
1147 struct ieee80211_sub_if_data,
1150 WARN_ON(drv_sta_add(local, sdata, &sta->sta));
1153 mutex_unlock(&local->sta_mtx);
1155 /* setup RTS threshold */
1156 drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1158 /* reconfigure hardware */
1159 ieee80211_hw_config(local, ~0);
1161 ieee80211_configure_filter(local);
1163 /* Finally also reconfigure all the BSS information */
1164 list_for_each_entry(sdata, &local->interfaces, list) {
1167 if (!ieee80211_sdata_running(sdata))
1170 /* common change flags for all interface types */
1171 changed = BSS_CHANGED_ERP_CTS_PROT |
1172 BSS_CHANGED_ERP_PREAMBLE |
1173 BSS_CHANGED_ERP_SLOT |
1175 BSS_CHANGED_BASIC_RATES |
1176 BSS_CHANGED_BEACON_INT |
1181 switch (sdata->vif.type) {
1182 case NL80211_IFTYPE_STATION:
1183 changed |= BSS_CHANGED_ASSOC;
1184 ieee80211_bss_info_change_notify(sdata, changed);
1186 case NL80211_IFTYPE_ADHOC:
1187 changed |= BSS_CHANGED_IBSS;
1189 case NL80211_IFTYPE_AP:
1190 case NL80211_IFTYPE_MESH_POINT:
1191 changed |= BSS_CHANGED_BEACON |
1192 BSS_CHANGED_BEACON_ENABLED;
1193 ieee80211_bss_info_change_notify(sdata, changed);
1195 case NL80211_IFTYPE_WDS:
1197 case NL80211_IFTYPE_AP_VLAN:
1198 case NL80211_IFTYPE_MONITOR:
1199 /* ignore virtual */
1201 case NL80211_IFTYPE_UNSPECIFIED:
1202 case NUM_NL80211_IFTYPES:
1203 case NL80211_IFTYPE_P2P_CLIENT:
1204 case NL80211_IFTYPE_P2P_GO:
1211 * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1212 * sessions can be established after a resume.
1214 * Also tear down aggregation sessions since reconfiguring
1215 * them in a hardware restart scenario is not easily done
1216 * right now, and the hardware will have lost information
1217 * about the sessions, but we and the AP still think they
1218 * are active. This is really a workaround though.
1220 if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1221 mutex_lock(&local->sta_mtx);
1223 list_for_each_entry(sta, &local->sta_list, list) {
1224 ieee80211_sta_tear_down_BA_sessions(sta, true);
1225 clear_sta_flags(sta, WLAN_STA_BLOCK_BA);
1228 mutex_unlock(&local->sta_mtx);
1232 list_for_each_entry(sdata, &local->interfaces, list)
1233 if (ieee80211_sdata_running(sdata))
1234 ieee80211_enable_keys(sdata);
1236 ieee80211_wake_queues_by_reason(hw,
1237 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1240 * If this is for hw restart things are still running.
1241 * We may want to change that later, however.
1243 if (!local->suspended)
1247 /* first set suspended false, then resuming */
1248 local->suspended = false;
1250 local->resuming = false;
1252 list_for_each_entry(sdata, &local->interfaces, list) {
1253 switch(sdata->vif.type) {
1254 case NL80211_IFTYPE_STATION:
1255 ieee80211_sta_restart(sdata);
1257 case NL80211_IFTYPE_ADHOC:
1258 ieee80211_ibss_restart(sdata);
1260 case NL80211_IFTYPE_MESH_POINT:
1261 ieee80211_mesh_restart(sdata);
1268 add_timer(&local->sta_cleanup);
1270 mutex_lock(&local->sta_mtx);
1271 list_for_each_entry(sta, &local->sta_list, list)
1272 mesh_plink_restart(sta);
1273 mutex_unlock(&local->sta_mtx);
1280 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1281 enum ieee80211_smps_mode *smps_mode)
1283 if (ifmgd->associated) {
1284 *smps_mode = ifmgd->ap_smps;
1286 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1287 if (ifmgd->powersave)
1288 *smps_mode = IEEE80211_SMPS_DYNAMIC;
1290 *smps_mode = IEEE80211_SMPS_OFF;
1299 /* must hold iflist_mtx */
1300 void ieee80211_recalc_smps(struct ieee80211_local *local)
1302 struct ieee80211_sub_if_data *sdata;
1303 enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1306 lockdep_assert_held(&local->iflist_mtx);
1309 * This function could be improved to handle multiple
1310 * interfaces better, but right now it makes any
1311 * non-station interfaces force SM PS to be turned
1312 * off. If there are multiple station interfaces it
1313 * could also use the best possible mode, e.g. if
1314 * one is in static and the other in dynamic then
1318 list_for_each_entry(sdata, &local->interfaces, list) {
1319 if (!ieee80211_sdata_running(sdata))
1321 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1324 count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1327 smps_mode = IEEE80211_SMPS_OFF;
1332 if (smps_mode == local->smps_mode)
1336 local->smps_mode = smps_mode;
1337 /* changed flag is auto-detected for this */
1338 ieee80211_hw_config(local, 0);
1341 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1345 for (i = 0; i < n_ids; i++)
1352 * ieee80211_ie_split - split an IE buffer according to ordering
1354 * @ies: the IE buffer
1355 * @ielen: the length of the IE buffer
1356 * @ids: an array with element IDs that are allowed before
1358 * @n_ids: the size of the element ID array
1359 * @offset: offset where to start splitting in the buffer
1361 * This function splits an IE buffer by updating the @offset
1362 * variable to point to the location where the buffer should be
1365 * It assumes that the given IE buffer is well-formed, this
1366 * has to be guaranteed by the caller!
1368 * It also assumes that the IEs in the buffer are ordered
1369 * correctly, if not the result of using this function will not
1370 * be ordered correctly either, i.e. it does no reordering.
1372 * The function returns the offset where the next part of the
1373 * buffer starts, which may be @ielen if the entire (remainder)
1374 * of the buffer should be used.
1376 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1377 const u8 *ids, int n_ids, size_t offset)
1379 size_t pos = offset;
1381 while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1382 pos += 2 + ies[pos + 1];
1387 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1389 size_t pos = offset;
1391 while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1392 pos += 2 + ies[pos + 1];