2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
11 * utilities for mac80211
14 #include <net/mac80211.h>
15 #include <linux/netdevice.h>
16 #include <linux/export.h>
17 #include <linux/types.h>
18 #include <linux/slab.h>
19 #include <linux/skbuff.h>
20 #include <linux/etherdevice.h>
21 #include <linux/if_arp.h>
22 #include <linux/bitmap.h>
23 #include <linux/crc32.h>
24 #include <net/net_namespace.h>
25 #include <net/cfg80211.h>
26 #include <net/rtnetlink.h>
28 #include "ieee80211_i.h"
29 #include "driver-ops.h"
36 /* privid for wiphys to determine whether they belong to us or not */
37 void *mac80211_wiphy_privid
= &mac80211_wiphy_privid
;
39 struct ieee80211_hw
*wiphy_to_ieee80211_hw(struct wiphy
*wiphy
)
41 struct ieee80211_local
*local
;
44 local
= wiphy_priv(wiphy
);
47 EXPORT_SYMBOL(wiphy_to_ieee80211_hw
);
49 u8
*ieee80211_get_bssid(struct ieee80211_hdr
*hdr
, size_t len
,
50 enum nl80211_iftype type
)
52 __le16 fc
= hdr
->frame_control
;
54 /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
58 if (ieee80211_is_data(fc
)) {
59 if (len
< 24) /* drop incorrect hdr len (data) */
62 if (ieee80211_has_a4(fc
))
64 if (ieee80211_has_tods(fc
))
66 if (ieee80211_has_fromds(fc
))
72 if (ieee80211_is_mgmt(fc
)) {
73 if (len
< 24) /* drop incorrect hdr len (mgmt) */
78 if (ieee80211_is_ctl(fc
)) {
79 if(ieee80211_is_pspoll(fc
))
82 if (ieee80211_is_back_req(fc
)) {
84 case NL80211_IFTYPE_STATION
:
86 case NL80211_IFTYPE_AP
:
87 case NL80211_IFTYPE_AP_VLAN
:
90 break; /* fall through to the return */
98 void ieee80211_tx_set_protected(struct ieee80211_tx_data
*tx
)
101 struct ieee80211_hdr
*hdr
;
103 skb_queue_walk(&tx
->skbs
, skb
) {
104 hdr
= (struct ieee80211_hdr
*) skb
->data
;
105 hdr
->frame_control
|= cpu_to_le16(IEEE80211_FCTL_PROTECTED
);
109 int ieee80211_frame_duration(enum ieee80211_band band
, size_t len
,
110 int rate
, int erp
, int short_preamble
)
114 /* calculate duration (in microseconds, rounded up to next higher
115 * integer if it includes a fractional microsecond) to send frame of
116 * len bytes (does not include FCS) at the given rate. Duration will
119 * rate is in 100 kbps, so divident is multiplied by 10 in the
120 * DIV_ROUND_UP() operations.
123 if (band
== IEEE80211_BAND_5GHZ
|| erp
) {
127 * N_DBPS = DATARATE x 4
128 * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
129 * (16 = SIGNAL time, 6 = tail bits)
130 * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
133 * 802.11a - 17.5.2: aSIFSTime = 16 usec
134 * 802.11g - 19.8.4: aSIFSTime = 10 usec +
135 * signal ext = 6 usec
137 dur
= 16; /* SIFS + signal ext */
138 dur
+= 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
139 dur
+= 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
140 dur
+= 4 * DIV_ROUND_UP((16 + 8 * (len
+ 4) + 6) * 10,
141 4 * rate
); /* T_SYM x N_SYM */
144 * 802.11b or 802.11g with 802.11b compatibility:
145 * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
146 * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
148 * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
149 * aSIFSTime = 10 usec
150 * aPreambleLength = 144 usec or 72 usec with short preamble
151 * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
153 dur
= 10; /* aSIFSTime = 10 usec */
154 dur
+= short_preamble
? (72 + 24) : (144 + 48);
156 dur
+= DIV_ROUND_UP(8 * (len
+ 4) * 10, rate
);
162 /* Exported duration function for driver use */
163 __le16
ieee80211_generic_frame_duration(struct ieee80211_hw
*hw
,
164 struct ieee80211_vif
*vif
,
165 enum ieee80211_band band
,
167 struct ieee80211_rate
*rate
)
169 struct ieee80211_sub_if_data
*sdata
;
172 bool short_preamble
= false;
176 sdata
= vif_to_sdata(vif
);
177 short_preamble
= sdata
->vif
.bss_conf
.use_short_preamble
;
178 if (sdata
->flags
& IEEE80211_SDATA_OPERATING_GMODE
)
179 erp
= rate
->flags
& IEEE80211_RATE_ERP_G
;
182 dur
= ieee80211_frame_duration(band
, frame_len
, rate
->bitrate
, erp
,
185 return cpu_to_le16(dur
);
187 EXPORT_SYMBOL(ieee80211_generic_frame_duration
);
189 __le16
ieee80211_rts_duration(struct ieee80211_hw
*hw
,
190 struct ieee80211_vif
*vif
, size_t frame_len
,
191 const struct ieee80211_tx_info
*frame_txctl
)
193 struct ieee80211_local
*local
= hw_to_local(hw
);
194 struct ieee80211_rate
*rate
;
195 struct ieee80211_sub_if_data
*sdata
;
199 struct ieee80211_supported_band
*sband
;
201 sband
= local
->hw
.wiphy
->bands
[frame_txctl
->band
];
203 short_preamble
= false;
205 rate
= &sband
->bitrates
[frame_txctl
->control
.rts_cts_rate_idx
];
209 sdata
= vif_to_sdata(vif
);
210 short_preamble
= sdata
->vif
.bss_conf
.use_short_preamble
;
211 if (sdata
->flags
& IEEE80211_SDATA_OPERATING_GMODE
)
212 erp
= rate
->flags
& IEEE80211_RATE_ERP_G
;
216 dur
= ieee80211_frame_duration(sband
->band
, 10, rate
->bitrate
,
217 erp
, short_preamble
);
218 /* Data frame duration */
219 dur
+= ieee80211_frame_duration(sband
->band
, frame_len
, rate
->bitrate
,
220 erp
, short_preamble
);
222 dur
+= ieee80211_frame_duration(sband
->band
, 10, rate
->bitrate
,
223 erp
, short_preamble
);
225 return cpu_to_le16(dur
);
227 EXPORT_SYMBOL(ieee80211_rts_duration
);
229 __le16
ieee80211_ctstoself_duration(struct ieee80211_hw
*hw
,
230 struct ieee80211_vif
*vif
,
232 const struct ieee80211_tx_info
*frame_txctl
)
234 struct ieee80211_local
*local
= hw_to_local(hw
);
235 struct ieee80211_rate
*rate
;
236 struct ieee80211_sub_if_data
*sdata
;
240 struct ieee80211_supported_band
*sband
;
242 sband
= local
->hw
.wiphy
->bands
[frame_txctl
->band
];
244 short_preamble
= false;
246 rate
= &sband
->bitrates
[frame_txctl
->control
.rts_cts_rate_idx
];
249 sdata
= vif_to_sdata(vif
);
250 short_preamble
= sdata
->vif
.bss_conf
.use_short_preamble
;
251 if (sdata
->flags
& IEEE80211_SDATA_OPERATING_GMODE
)
252 erp
= rate
->flags
& IEEE80211_RATE_ERP_G
;
255 /* Data frame duration */
256 dur
= ieee80211_frame_duration(sband
->band
, frame_len
, rate
->bitrate
,
257 erp
, short_preamble
);
258 if (!(frame_txctl
->flags
& IEEE80211_TX_CTL_NO_ACK
)) {
260 dur
+= ieee80211_frame_duration(sband
->band
, 10, rate
->bitrate
,
261 erp
, short_preamble
);
264 return cpu_to_le16(dur
);
266 EXPORT_SYMBOL(ieee80211_ctstoself_duration
);
268 void ieee80211_propagate_queue_wake(struct ieee80211_local
*local
, int queue
)
270 struct ieee80211_sub_if_data
*sdata
;
272 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
275 if (test_bit(SDATA_STATE_OFFCHANNEL
, &sdata
->state
))
278 if (sdata
->vif
.cab_queue
!= IEEE80211_INVAL_HW_QUEUE
&&
279 local
->queue_stop_reasons
[sdata
->vif
.cab_queue
] != 0)
282 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++) {
283 int ac_queue
= sdata
->vif
.hw_queue
[ac
];
285 if (ac_queue
== queue
||
286 (sdata
->vif
.cab_queue
== queue
&&
287 local
->queue_stop_reasons
[ac_queue
] == 0 &&
288 skb_queue_empty(&local
->pending
[ac_queue
])))
289 netif_wake_subqueue(sdata
->dev
, ac
);
294 static void __ieee80211_wake_queue(struct ieee80211_hw
*hw
, int queue
,
295 enum queue_stop_reason reason
)
297 struct ieee80211_local
*local
= hw_to_local(hw
);
299 trace_wake_queue(local
, queue
, reason
);
301 if (WARN_ON(queue
>= hw
->queues
))
304 if (!test_bit(reason
, &local
->queue_stop_reasons
[queue
]))
307 __clear_bit(reason
, &local
->queue_stop_reasons
[queue
]);
309 if (local
->queue_stop_reasons
[queue
] != 0)
310 /* someone still has this queue stopped */
313 if (skb_queue_empty(&local
->pending
[queue
])) {
315 ieee80211_propagate_queue_wake(local
, queue
);
318 tasklet_schedule(&local
->tx_pending_tasklet
);
321 void ieee80211_wake_queue_by_reason(struct ieee80211_hw
*hw
, int queue
,
322 enum queue_stop_reason reason
)
324 struct ieee80211_local
*local
= hw_to_local(hw
);
327 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
328 __ieee80211_wake_queue(hw
, queue
, reason
);
329 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
332 void ieee80211_wake_queue(struct ieee80211_hw
*hw
, int queue
)
334 ieee80211_wake_queue_by_reason(hw
, queue
,
335 IEEE80211_QUEUE_STOP_REASON_DRIVER
);
337 EXPORT_SYMBOL(ieee80211_wake_queue
);
339 static void __ieee80211_stop_queue(struct ieee80211_hw
*hw
, int queue
,
340 enum queue_stop_reason reason
)
342 struct ieee80211_local
*local
= hw_to_local(hw
);
343 struct ieee80211_sub_if_data
*sdata
;
345 trace_stop_queue(local
, queue
, reason
);
347 if (WARN_ON(queue
>= hw
->queues
))
350 if (test_bit(reason
, &local
->queue_stop_reasons
[queue
]))
353 __set_bit(reason
, &local
->queue_stop_reasons
[queue
]);
356 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
359 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++) {
360 if (sdata
->vif
.hw_queue
[ac
] == queue
||
361 sdata
->vif
.cab_queue
== queue
)
362 netif_stop_subqueue(sdata
->dev
, ac
);
368 void ieee80211_stop_queue_by_reason(struct ieee80211_hw
*hw
, int queue
,
369 enum queue_stop_reason reason
)
371 struct ieee80211_local
*local
= hw_to_local(hw
);
374 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
375 __ieee80211_stop_queue(hw
, queue
, reason
);
376 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
379 void ieee80211_stop_queue(struct ieee80211_hw
*hw
, int queue
)
381 ieee80211_stop_queue_by_reason(hw
, queue
,
382 IEEE80211_QUEUE_STOP_REASON_DRIVER
);
384 EXPORT_SYMBOL(ieee80211_stop_queue
);
386 void ieee80211_add_pending_skb(struct ieee80211_local
*local
,
389 struct ieee80211_hw
*hw
= &local
->hw
;
391 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
392 int queue
= info
->hw_queue
;
394 if (WARN_ON(!info
->control
.vif
)) {
399 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
400 __ieee80211_stop_queue(hw
, queue
, IEEE80211_QUEUE_STOP_REASON_SKB_ADD
);
401 __skb_queue_tail(&local
->pending
[queue
], skb
);
402 __ieee80211_wake_queue(hw
, queue
, IEEE80211_QUEUE_STOP_REASON_SKB_ADD
);
403 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
406 void ieee80211_add_pending_skbs_fn(struct ieee80211_local
*local
,
407 struct sk_buff_head
*skbs
,
408 void (*fn
)(void *data
), void *data
)
410 struct ieee80211_hw
*hw
= &local
->hw
;
415 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
416 while ((skb
= skb_dequeue(skbs
))) {
417 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
419 if (WARN_ON(!info
->control
.vif
)) {
424 queue
= info
->hw_queue
;
426 __ieee80211_stop_queue(hw
, queue
,
427 IEEE80211_QUEUE_STOP_REASON_SKB_ADD
);
429 __skb_queue_tail(&local
->pending
[queue
], skb
);
435 for (i
= 0; i
< hw
->queues
; i
++)
436 __ieee80211_wake_queue(hw
, i
,
437 IEEE80211_QUEUE_STOP_REASON_SKB_ADD
);
438 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
441 void ieee80211_stop_queues_by_reason(struct ieee80211_hw
*hw
,
442 enum queue_stop_reason reason
)
444 struct ieee80211_local
*local
= hw_to_local(hw
);
448 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
450 for (i
= 0; i
< hw
->queues
; i
++)
451 __ieee80211_stop_queue(hw
, i
, reason
);
453 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
456 void ieee80211_stop_queues(struct ieee80211_hw
*hw
)
458 ieee80211_stop_queues_by_reason(hw
,
459 IEEE80211_QUEUE_STOP_REASON_DRIVER
);
461 EXPORT_SYMBOL(ieee80211_stop_queues
);
463 int ieee80211_queue_stopped(struct ieee80211_hw
*hw
, int queue
)
465 struct ieee80211_local
*local
= hw_to_local(hw
);
469 if (WARN_ON(queue
>= hw
->queues
))
472 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
473 ret
= !!local
->queue_stop_reasons
[queue
];
474 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
477 EXPORT_SYMBOL(ieee80211_queue_stopped
);
479 void ieee80211_wake_queues_by_reason(struct ieee80211_hw
*hw
,
480 enum queue_stop_reason reason
)
482 struct ieee80211_local
*local
= hw_to_local(hw
);
486 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
488 for (i
= 0; i
< hw
->queues
; i
++)
489 __ieee80211_wake_queue(hw
, i
, reason
);
491 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
494 void ieee80211_wake_queues(struct ieee80211_hw
*hw
)
496 ieee80211_wake_queues_by_reason(hw
, IEEE80211_QUEUE_STOP_REASON_DRIVER
);
498 EXPORT_SYMBOL(ieee80211_wake_queues
);
500 void ieee80211_iterate_active_interfaces(
501 struct ieee80211_hw
*hw
,
502 void (*iterator
)(void *data
, u8
*mac
,
503 struct ieee80211_vif
*vif
),
506 struct ieee80211_local
*local
= hw_to_local(hw
);
507 struct ieee80211_sub_if_data
*sdata
;
509 mutex_lock(&local
->iflist_mtx
);
511 list_for_each_entry(sdata
, &local
->interfaces
, list
) {
512 switch (sdata
->vif
.type
) {
513 case NL80211_IFTYPE_MONITOR
:
514 case NL80211_IFTYPE_AP_VLAN
:
519 if (ieee80211_sdata_running(sdata
))
520 iterator(data
, sdata
->vif
.addr
,
524 mutex_unlock(&local
->iflist_mtx
);
526 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces
);
528 void ieee80211_iterate_active_interfaces_atomic(
529 struct ieee80211_hw
*hw
,
530 void (*iterator
)(void *data
, u8
*mac
,
531 struct ieee80211_vif
*vif
),
534 struct ieee80211_local
*local
= hw_to_local(hw
);
535 struct ieee80211_sub_if_data
*sdata
;
539 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
540 switch (sdata
->vif
.type
) {
541 case NL80211_IFTYPE_MONITOR
:
542 case NL80211_IFTYPE_AP_VLAN
:
547 if (ieee80211_sdata_running(sdata
))
548 iterator(data
, sdata
->vif
.addr
,
554 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic
);
557 * Nothing should have been stuffed into the workqueue during
558 * the suspend->resume cycle. If this WARN is seen then there
559 * is a bug with either the driver suspend or something in
560 * mac80211 stuffing into the workqueue which we haven't yet
561 * cleared during mac80211's suspend cycle.
563 static bool ieee80211_can_queue_work(struct ieee80211_local
*local
)
565 if (WARN(local
->suspended
&& !local
->resuming
,
566 "queueing ieee80211 work while going to suspend\n"))
572 void ieee80211_queue_work(struct ieee80211_hw
*hw
, struct work_struct
*work
)
574 struct ieee80211_local
*local
= hw_to_local(hw
);
576 if (!ieee80211_can_queue_work(local
))
579 queue_work(local
->workqueue
, work
);
581 EXPORT_SYMBOL(ieee80211_queue_work
);
583 void ieee80211_queue_delayed_work(struct ieee80211_hw
*hw
,
584 struct delayed_work
*dwork
,
587 struct ieee80211_local
*local
= hw_to_local(hw
);
589 if (!ieee80211_can_queue_work(local
))
592 queue_delayed_work(local
->workqueue
, dwork
, delay
);
594 EXPORT_SYMBOL(ieee80211_queue_delayed_work
);
596 u32
ieee802_11_parse_elems_crc(u8
*start
, size_t len
,
597 struct ieee802_11_elems
*elems
,
602 bool calc_crc
= filter
!= 0;
603 DECLARE_BITMAP(seen_elems
, 256);
605 bitmap_zero(seen_elems
, 256);
606 memset(elems
, 0, sizeof(*elems
));
607 elems
->ie_start
= start
;
608 elems
->total_len
= len
;
612 bool elem_parse_failed
;
619 elems
->parse_error
= true;
623 if (id
!= WLAN_EID_VENDOR_SPECIFIC
&&
624 id
!= WLAN_EID_QUIET
&&
625 test_bit(id
, seen_elems
)) {
626 elems
->parse_error
= true;
632 if (calc_crc
&& id
< 64 && (filter
& (1ULL << id
)))
633 crc
= crc32_be(crc
, pos
- 2, elen
+ 2);
635 elem_parse_failed
= false;
640 elems
->ssid_len
= elen
;
642 case WLAN_EID_SUPP_RATES
:
643 elems
->supp_rates
= pos
;
644 elems
->supp_rates_len
= elen
;
646 case WLAN_EID_FH_PARAMS
:
647 elems
->fh_params
= pos
;
648 elems
->fh_params_len
= elen
;
650 case WLAN_EID_DS_PARAMS
:
651 elems
->ds_params
= pos
;
652 elems
->ds_params_len
= elen
;
654 case WLAN_EID_CF_PARAMS
:
655 elems
->cf_params
= pos
;
656 elems
->cf_params_len
= elen
;
659 if (elen
>= sizeof(struct ieee80211_tim_ie
)) {
660 elems
->tim
= (void *)pos
;
661 elems
->tim_len
= elen
;
663 elem_parse_failed
= true;
665 case WLAN_EID_IBSS_PARAMS
:
666 elems
->ibss_params
= pos
;
667 elems
->ibss_params_len
= elen
;
669 case WLAN_EID_CHALLENGE
:
670 elems
->challenge
= pos
;
671 elems
->challenge_len
= elen
;
673 case WLAN_EID_VENDOR_SPECIFIC
:
674 if (elen
>= 4 && pos
[0] == 0x00 && pos
[1] == 0x50 &&
676 /* Microsoft OUI (00:50:F2) */
679 crc
= crc32_be(crc
, pos
- 2, elen
+ 2);
682 /* OUI Type 1 - WPA IE */
684 elems
->wpa_len
= elen
;
685 } else if (elen
>= 5 && pos
[3] == 2) {
686 /* OUI Type 2 - WMM IE */
688 elems
->wmm_info
= pos
;
689 elems
->wmm_info_len
= elen
;
690 } else if (pos
[4] == 1) {
691 elems
->wmm_param
= pos
;
692 elems
->wmm_param_len
= elen
;
699 elems
->rsn_len
= elen
;
701 case WLAN_EID_ERP_INFO
:
702 elems
->erp_info
= pos
;
703 elems
->erp_info_len
= elen
;
705 case WLAN_EID_EXT_SUPP_RATES
:
706 elems
->ext_supp_rates
= pos
;
707 elems
->ext_supp_rates_len
= elen
;
709 case WLAN_EID_HT_CAPABILITY
:
710 if (elen
>= sizeof(struct ieee80211_ht_cap
))
711 elems
->ht_cap_elem
= (void *)pos
;
713 elem_parse_failed
= true;
715 case WLAN_EID_HT_OPERATION
:
716 if (elen
>= sizeof(struct ieee80211_ht_operation
))
717 elems
->ht_operation
= (void *)pos
;
719 elem_parse_failed
= true;
721 case WLAN_EID_MESH_ID
:
722 elems
->mesh_id
= pos
;
723 elems
->mesh_id_len
= elen
;
725 case WLAN_EID_MESH_CONFIG
:
726 if (elen
>= sizeof(struct ieee80211_meshconf_ie
))
727 elems
->mesh_config
= (void *)pos
;
729 elem_parse_failed
= true;
731 case WLAN_EID_PEER_MGMT
:
732 elems
->peering
= pos
;
733 elems
->peering_len
= elen
;
737 elems
->preq_len
= elen
;
741 elems
->prep_len
= elen
;
745 elems
->perr_len
= elen
;
748 if (elen
>= sizeof(struct ieee80211_rann_ie
))
749 elems
->rann
= (void *)pos
;
751 elem_parse_failed
= true;
753 case WLAN_EID_CHANNEL_SWITCH
:
754 elems
->ch_switch_elem
= pos
;
755 elems
->ch_switch_elem_len
= elen
;
758 if (!elems
->quiet_elem
) {
759 elems
->quiet_elem
= pos
;
760 elems
->quiet_elem_len
= elen
;
762 elems
->num_of_quiet_elem
++;
764 case WLAN_EID_COUNTRY
:
765 elems
->country_elem
= pos
;
766 elems
->country_elem_len
= elen
;
768 case WLAN_EID_PWR_CONSTRAINT
:
769 elems
->pwr_constr_elem
= pos
;
770 elems
->pwr_constr_elem_len
= elen
;
772 case WLAN_EID_TIMEOUT_INTERVAL
:
773 elems
->timeout_int
= pos
;
774 elems
->timeout_int_len
= elen
;
780 if (elem_parse_failed
)
781 elems
->parse_error
= true;
783 set_bit(id
, seen_elems
);
790 elems
->parse_error
= true;
795 void ieee802_11_parse_elems(u8
*start
, size_t len
,
796 struct ieee802_11_elems
*elems
)
798 ieee802_11_parse_elems_crc(start
, len
, elems
, 0, 0);
801 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data
*sdata
,
804 struct ieee80211_local
*local
= sdata
->local
;
805 struct ieee80211_tx_queue_params qparam
;
810 if (!local
->ops
->conf_tx
)
813 if (local
->hw
.queues
< IEEE80211_NUM_ACS
)
816 memset(&qparam
, 0, sizeof(qparam
));
818 use_11b
= (local
->hw
.conf
.channel
->band
== IEEE80211_BAND_2GHZ
) &&
819 !(sdata
->flags
& IEEE80211_SDATA_OPERATING_GMODE
);
821 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++) {
822 /* Set defaults according to 802.11-2007 Table 7-37 */
830 case IEEE80211_AC_BK
:
831 qparam
.cw_max
= aCWmax
;
832 qparam
.cw_min
= aCWmin
;
836 default: /* never happens but let's not leave undefined */
837 case IEEE80211_AC_BE
:
838 qparam
.cw_max
= aCWmax
;
839 qparam
.cw_min
= aCWmin
;
843 case IEEE80211_AC_VI
:
844 qparam
.cw_max
= aCWmin
;
845 qparam
.cw_min
= (aCWmin
+ 1) / 2 - 1;
847 qparam
.txop
= 6016/32;
849 qparam
.txop
= 3008/32;
852 case IEEE80211_AC_VO
:
853 qparam
.cw_max
= (aCWmin
+ 1) / 2 - 1;
854 qparam
.cw_min
= (aCWmin
+ 1) / 4 - 1;
856 qparam
.txop
= 3264/32;
858 qparam
.txop
= 1504/32;
863 qparam
.uapsd
= false;
865 sdata
->tx_conf
[ac
] = qparam
;
866 drv_conf_tx(local
, sdata
, ac
, &qparam
);
869 /* after reinitialize QoS TX queues setting to default,
870 * disable QoS at all */
872 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
) {
873 sdata
->vif
.bss_conf
.qos
=
874 sdata
->vif
.type
!= NL80211_IFTYPE_STATION
;
876 ieee80211_bss_info_change_notify(sdata
,
881 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data
*sdata
,
882 const size_t supp_rates_len
,
883 const u8
*supp_rates
)
885 struct ieee80211_local
*local
= sdata
->local
;
886 int i
, have_higher_than_11mbit
= 0;
888 /* cf. IEEE 802.11 9.2.12 */
889 for (i
= 0; i
< supp_rates_len
; i
++)
890 if ((supp_rates
[i
] & 0x7f) * 5 > 110)
891 have_higher_than_11mbit
= 1;
893 if (local
->hw
.conf
.channel
->band
== IEEE80211_BAND_2GHZ
&&
894 have_higher_than_11mbit
)
895 sdata
->flags
|= IEEE80211_SDATA_OPERATING_GMODE
;
897 sdata
->flags
&= ~IEEE80211_SDATA_OPERATING_GMODE
;
899 ieee80211_set_wmm_default(sdata
, true);
902 u32
ieee80211_mandatory_rates(struct ieee80211_local
*local
,
903 enum ieee80211_band band
)
905 struct ieee80211_supported_band
*sband
;
906 struct ieee80211_rate
*bitrates
;
908 enum ieee80211_rate_flags mandatory_flag
;
911 sband
= local
->hw
.wiphy
->bands
[band
];
915 if (band
== IEEE80211_BAND_2GHZ
)
916 mandatory_flag
= IEEE80211_RATE_MANDATORY_B
;
918 mandatory_flag
= IEEE80211_RATE_MANDATORY_A
;
920 bitrates
= sband
->bitrates
;
922 for (i
= 0; i
< sband
->n_bitrates
; i
++)
923 if (bitrates
[i
].flags
& mandatory_flag
)
924 mandatory_rates
|= BIT(i
);
925 return mandatory_rates
;
928 void ieee80211_send_auth(struct ieee80211_sub_if_data
*sdata
,
929 u16 transaction
, u16 auth_alg
,
930 u8
*extra
, size_t extra_len
, const u8
*da
,
931 const u8
*bssid
, const u8
*key
, u8 key_len
, u8 key_idx
)
933 struct ieee80211_local
*local
= sdata
->local
;
935 struct ieee80211_mgmt
*mgmt
;
938 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+
939 sizeof(*mgmt
) + 6 + extra_len
);
943 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
945 mgmt
= (struct ieee80211_mgmt
*) skb_put(skb
, 24 + 6);
946 memset(mgmt
, 0, 24 + 6);
947 mgmt
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
948 IEEE80211_STYPE_AUTH
);
949 memcpy(mgmt
->da
, da
, ETH_ALEN
);
950 memcpy(mgmt
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
951 memcpy(mgmt
->bssid
, bssid
, ETH_ALEN
);
952 mgmt
->u
.auth
.auth_alg
= cpu_to_le16(auth_alg
);
953 mgmt
->u
.auth
.auth_transaction
= cpu_to_le16(transaction
);
954 mgmt
->u
.auth
.status_code
= cpu_to_le16(0);
956 memcpy(skb_put(skb
, extra_len
), extra
, extra_len
);
958 if (auth_alg
== WLAN_AUTH_SHARED_KEY
&& transaction
== 3) {
959 mgmt
->frame_control
|= cpu_to_le16(IEEE80211_FCTL_PROTECTED
);
960 err
= ieee80211_wep_encrypt(local
, skb
, key
, key_len
, key_idx
);
964 IEEE80211_SKB_CB(skb
)->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
965 ieee80211_tx_skb(sdata
, skb
);
968 int ieee80211_build_preq_ies(struct ieee80211_local
*local
, u8
*buffer
,
969 const u8
*ie
, size_t ie_len
,
970 enum ieee80211_band band
, u32 rate_mask
,
973 struct ieee80211_supported_band
*sband
;
975 size_t offset
= 0, noffset
;
976 int supp_rates_len
, i
;
981 sband
= local
->hw
.wiphy
->bands
[band
];
986 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
987 if ((BIT(i
) & rate_mask
) == 0)
988 continue; /* skip rate */
989 rates
[num_rates
++] = (u8
) (sband
->bitrates
[i
].bitrate
/ 5);
992 supp_rates_len
= min_t(int, num_rates
, 8);
994 *pos
++ = WLAN_EID_SUPP_RATES
;
995 *pos
++ = supp_rates_len
;
996 memcpy(pos
, rates
, supp_rates_len
);
997 pos
+= supp_rates_len
;
999 /* insert "request information" if in custom IEs */
1001 static const u8 before_extrates
[] = {
1003 WLAN_EID_SUPP_RATES
,
1006 noffset
= ieee80211_ie_split(ie
, ie_len
,
1008 ARRAY_SIZE(before_extrates
),
1010 memcpy(pos
, ie
+ offset
, noffset
- offset
);
1011 pos
+= noffset
- offset
;
1015 ext_rates_len
= num_rates
- supp_rates_len
;
1016 if (ext_rates_len
> 0) {
1017 *pos
++ = WLAN_EID_EXT_SUPP_RATES
;
1018 *pos
++ = ext_rates_len
;
1019 memcpy(pos
, rates
+ supp_rates_len
, ext_rates_len
);
1020 pos
+= ext_rates_len
;
1023 if (channel
&& sband
->band
== IEEE80211_BAND_2GHZ
) {
1024 *pos
++ = WLAN_EID_DS_PARAMS
;
1029 /* insert custom IEs that go before HT */
1031 static const u8 before_ht
[] = {
1033 WLAN_EID_SUPP_RATES
,
1035 WLAN_EID_EXT_SUPP_RATES
,
1037 WLAN_EID_SUPPORTED_REGULATORY_CLASSES
,
1039 noffset
= ieee80211_ie_split(ie
, ie_len
,
1040 before_ht
, ARRAY_SIZE(before_ht
),
1042 memcpy(pos
, ie
+ offset
, noffset
- offset
);
1043 pos
+= noffset
- offset
;
1047 if (sband
->ht_cap
.ht_supported
)
1048 pos
= ieee80211_ie_build_ht_cap(pos
, &sband
->ht_cap
,
1052 * If adding more here, adjust code in main.c
1053 * that calculates local->scan_ies_len.
1056 /* add any remaining custom IEs */
1059 memcpy(pos
, ie
+ offset
, noffset
- offset
);
1060 pos
+= noffset
- offset
;
1063 return pos
- buffer
;
1066 struct sk_buff
*ieee80211_build_probe_req(struct ieee80211_sub_if_data
*sdata
,
1067 u8
*dst
, u32 ratemask
,
1068 const u8
*ssid
, size_t ssid_len
,
1069 const u8
*ie
, size_t ie_len
,
1072 struct ieee80211_local
*local
= sdata
->local
;
1073 struct sk_buff
*skb
;
1074 struct ieee80211_mgmt
*mgmt
;
1079 /* FIXME: come up with a proper value */
1080 buf
= kmalloc(200 + ie_len
, GFP_KERNEL
);
1085 * Do not send DS Channel parameter for directed probe requests
1086 * in order to maximize the chance that we get a response. Some
1087 * badly-behaved APs don't respond when this parameter is included.
1092 chan
= ieee80211_frequency_to_channel(
1093 local
->hw
.conf
.channel
->center_freq
);
1095 buf_len
= ieee80211_build_preq_ies(local
, buf
, ie
, ie_len
,
1096 local
->hw
.conf
.channel
->band
,
1099 skb
= ieee80211_probereq_get(&local
->hw
, &sdata
->vif
,
1106 mgmt
= (struct ieee80211_mgmt
*) skb
->data
;
1107 memcpy(mgmt
->da
, dst
, ETH_ALEN
);
1108 memcpy(mgmt
->bssid
, dst
, ETH_ALEN
);
1111 IEEE80211_SKB_CB(skb
)->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
1119 void ieee80211_send_probe_req(struct ieee80211_sub_if_data
*sdata
, u8
*dst
,
1120 const u8
*ssid
, size_t ssid_len
,
1121 const u8
*ie
, size_t ie_len
,
1122 u32 ratemask
, bool directed
, bool no_cck
)
1124 struct sk_buff
*skb
;
1126 skb
= ieee80211_build_probe_req(sdata
, dst
, ratemask
, ssid
, ssid_len
,
1127 ie
, ie_len
, directed
);
1130 IEEE80211_SKB_CB(skb
)->flags
|=
1131 IEEE80211_TX_CTL_NO_CCK_RATE
;
1132 ieee80211_tx_skb(sdata
, skb
);
1136 u32
ieee80211_sta_get_rates(struct ieee80211_local
*local
,
1137 struct ieee802_11_elems
*elems
,
1138 enum ieee80211_band band
, u32
*basic_rates
)
1140 struct ieee80211_supported_band
*sband
;
1141 struct ieee80211_rate
*bitrates
;
1145 sband
= local
->hw
.wiphy
->bands
[band
];
1147 if (WARN_ON(!sband
))
1150 bitrates
= sband
->bitrates
;
1151 num_rates
= sband
->n_bitrates
;
1153 for (i
= 0; i
< elems
->supp_rates_len
+
1154 elems
->ext_supp_rates_len
; i
++) {
1158 if (i
< elems
->supp_rates_len
)
1159 rate
= elems
->supp_rates
[i
];
1160 else if (elems
->ext_supp_rates
)
1161 rate
= elems
->ext_supp_rates
1162 [i
- elems
->supp_rates_len
];
1163 own_rate
= 5 * (rate
& 0x7f);
1164 is_basic
= !!(rate
& 0x80);
1166 if (is_basic
&& (rate
& 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY
)
1169 for (j
= 0; j
< num_rates
; j
++) {
1170 if (bitrates
[j
].bitrate
== own_rate
) {
1171 supp_rates
|= BIT(j
);
1172 if (basic_rates
&& is_basic
)
1173 *basic_rates
|= BIT(j
);
1180 void ieee80211_stop_device(struct ieee80211_local
*local
)
1182 ieee80211_led_radio(local
, false);
1183 ieee80211_mod_tpt_led_trig(local
, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO
);
1185 cancel_work_sync(&local
->reconfig_filter
);
1187 flush_workqueue(local
->workqueue
);
1191 int ieee80211_reconfig(struct ieee80211_local
*local
)
1193 struct ieee80211_hw
*hw
= &local
->hw
;
1194 struct ieee80211_sub_if_data
*sdata
;
1195 struct sta_info
*sta
;
1199 if (local
->suspended
)
1200 local
->resuming
= true;
1202 if (local
->wowlan
) {
1203 local
->wowlan
= false;
1204 res
= drv_resume(local
);
1206 local
->resuming
= false;
1213 * res is 1, which means the driver requested
1214 * to go through a regular reset on wakeup.
1218 /* everything else happens only if HW was up & running */
1219 if (!local
->open_count
)
1223 * Upon resume hardware can sometimes be goofy due to
1224 * various platform / driver / bus issues, so restarting
1225 * the device may at times not work immediately. Propagate
1228 res
= drv_start(local
);
1230 WARN(local
->suspended
, "Hardware became unavailable "
1231 "upon resume. This could be a software issue "
1232 "prior to suspend or a hardware issue.\n");
1236 /* setup fragmentation threshold */
1237 drv_set_frag_threshold(local
, hw
->wiphy
->frag_threshold
);
1239 /* setup RTS threshold */
1240 drv_set_rts_threshold(local
, hw
->wiphy
->rts_threshold
);
1242 /* reset coverage class */
1243 drv_set_coverage_class(local
, hw
->wiphy
->coverage_class
);
1245 ieee80211_led_radio(local
, true);
1246 ieee80211_mod_tpt_led_trig(local
,
1247 IEEE80211_TPT_LEDTRIG_FL_RADIO
, 0);
1249 /* add interfaces */
1250 sdata
= rtnl_dereference(local
->monitor_sdata
);
1252 res
= drv_add_interface(local
, sdata
);
1254 rcu_assign_pointer(local
->monitor_sdata
, NULL
);
1260 list_for_each_entry(sdata
, &local
->interfaces
, list
) {
1261 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
1262 sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
&&
1263 ieee80211_sdata_running(sdata
))
1264 res
= drv_add_interface(local
, sdata
);
1268 mutex_lock(&local
->sta_mtx
);
1269 list_for_each_entry(sta
, &local
->sta_list
, list
) {
1270 if (sta
->uploaded
) {
1271 enum ieee80211_sta_state state
;
1273 for (state
= IEEE80211_STA_NOTEXIST
;
1274 state
< sta
->sta_state
; state
++)
1275 WARN_ON(drv_sta_state(local
, sta
->sdata
, sta
,
1279 mutex_unlock(&local
->sta_mtx
);
1281 /* reconfigure tx conf */
1282 if (hw
->queues
>= IEEE80211_NUM_ACS
) {
1283 list_for_each_entry(sdata
, &local
->interfaces
, list
) {
1284 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
||
1285 sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
1286 !ieee80211_sdata_running(sdata
))
1289 for (i
= 0; i
< IEEE80211_NUM_ACS
; i
++)
1290 drv_conf_tx(local
, sdata
, i
,
1291 &sdata
->tx_conf
[i
]);
1295 /* reconfigure hardware */
1296 ieee80211_hw_config(local
, ~0);
1298 ieee80211_configure_filter(local
);
1300 /* Finally also reconfigure all the BSS information */
1301 list_for_each_entry(sdata
, &local
->interfaces
, list
) {
1304 if (!ieee80211_sdata_running(sdata
))
1307 /* common change flags for all interface types */
1308 changed
= BSS_CHANGED_ERP_CTS_PROT
|
1309 BSS_CHANGED_ERP_PREAMBLE
|
1310 BSS_CHANGED_ERP_SLOT
|
1312 BSS_CHANGED_BASIC_RATES
|
1313 BSS_CHANGED_BEACON_INT
|
1319 switch (sdata
->vif
.type
) {
1320 case NL80211_IFTYPE_STATION
:
1321 changed
|= BSS_CHANGED_ASSOC
|
1322 BSS_CHANGED_ARP_FILTER
;
1323 mutex_lock(&sdata
->u
.mgd
.mtx
);
1324 ieee80211_bss_info_change_notify(sdata
, changed
);
1325 mutex_unlock(&sdata
->u
.mgd
.mtx
);
1327 case NL80211_IFTYPE_ADHOC
:
1328 changed
|= BSS_CHANGED_IBSS
;
1330 case NL80211_IFTYPE_AP
:
1331 changed
|= BSS_CHANGED_SSID
;
1333 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
)
1334 changed
|= BSS_CHANGED_AP_PROBE_RESP
;
1337 case NL80211_IFTYPE_MESH_POINT
:
1338 changed
|= BSS_CHANGED_BEACON
|
1339 BSS_CHANGED_BEACON_ENABLED
;
1340 ieee80211_bss_info_change_notify(sdata
, changed
);
1342 case NL80211_IFTYPE_WDS
:
1344 case NL80211_IFTYPE_AP_VLAN
:
1345 case NL80211_IFTYPE_MONITOR
:
1346 /* ignore virtual */
1348 case NL80211_IFTYPE_UNSPECIFIED
:
1349 case NUM_NL80211_IFTYPES
:
1350 case NL80211_IFTYPE_P2P_CLIENT
:
1351 case NL80211_IFTYPE_P2P_GO
:
1357 ieee80211_recalc_ps(local
, -1);
1360 * The sta might be in psm against the ap (e.g. because
1361 * this was the state before a hw restart), so we
1362 * explicitly send a null packet in order to make sure
1363 * it'll sync against the ap (and get out of psm).
1365 if (!(local
->hw
.conf
.flags
& IEEE80211_CONF_PS
)) {
1366 list_for_each_entry(sdata
, &local
->interfaces
, list
) {
1367 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
1370 ieee80211_send_nullfunc(local
, sdata
, 0);
1375 list_for_each_entry(sdata
, &local
->interfaces
, list
)
1376 if (ieee80211_sdata_running(sdata
))
1377 ieee80211_enable_keys(sdata
);
1381 * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1382 * sessions can be established after a resume.
1384 * Also tear down aggregation sessions since reconfiguring
1385 * them in a hardware restart scenario is not easily done
1386 * right now, and the hardware will have lost information
1387 * about the sessions, but we and the AP still think they
1388 * are active. This is really a workaround though.
1390 if (hw
->flags
& IEEE80211_HW_AMPDU_AGGREGATION
) {
1391 mutex_lock(&local
->sta_mtx
);
1393 list_for_each_entry(sta
, &local
->sta_list
, list
) {
1394 ieee80211_sta_tear_down_BA_sessions(sta
, true);
1395 clear_sta_flag(sta
, WLAN_STA_BLOCK_BA
);
1398 mutex_unlock(&local
->sta_mtx
);
1401 ieee80211_wake_queues_by_reason(hw
,
1402 IEEE80211_QUEUE_STOP_REASON_SUSPEND
);
1405 * If this is for hw restart things are still running.
1406 * We may want to change that later, however.
1408 if (!local
->suspended
)
1412 /* first set suspended false, then resuming */
1413 local
->suspended
= false;
1415 local
->resuming
= false;
1417 list_for_each_entry(sdata
, &local
->interfaces
, list
) {
1418 switch(sdata
->vif
.type
) {
1419 case NL80211_IFTYPE_STATION
:
1420 ieee80211_sta_restart(sdata
);
1422 case NL80211_IFTYPE_ADHOC
:
1423 ieee80211_ibss_restart(sdata
);
1425 case NL80211_IFTYPE_MESH_POINT
:
1426 ieee80211_mesh_restart(sdata
);
1433 mod_timer(&local
->sta_cleanup
, jiffies
+ 1);
1435 mutex_lock(&local
->sta_mtx
);
1436 list_for_each_entry(sta
, &local
->sta_list
, list
)
1437 mesh_plink_restart(sta
);
1438 mutex_unlock(&local
->sta_mtx
);
1445 void ieee80211_resume_disconnect(struct ieee80211_vif
*vif
)
1447 struct ieee80211_sub_if_data
*sdata
;
1448 struct ieee80211_local
*local
;
1449 struct ieee80211_key
*key
;
1454 sdata
= vif_to_sdata(vif
);
1455 local
= sdata
->local
;
1457 if (WARN_ON(!local
->resuming
))
1460 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
1463 sdata
->flags
|= IEEE80211_SDATA_DISCONNECT_RESUME
;
1465 mutex_lock(&local
->key_mtx
);
1466 list_for_each_entry(key
, &sdata
->key_list
, list
)
1467 key
->flags
|= KEY_FLAG_TAINTED
;
1468 mutex_unlock(&local
->key_mtx
);
1470 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect
);
1472 static int check_mgd_smps(struct ieee80211_if_managed
*ifmgd
,
1473 enum ieee80211_smps_mode
*smps_mode
)
1475 if (ifmgd
->associated
) {
1476 *smps_mode
= ifmgd
->ap_smps
;
1478 if (*smps_mode
== IEEE80211_SMPS_AUTOMATIC
) {
1479 if (ifmgd
->powersave
)
1480 *smps_mode
= IEEE80211_SMPS_DYNAMIC
;
1482 *smps_mode
= IEEE80211_SMPS_OFF
;
1491 /* must hold iflist_mtx */
1492 void ieee80211_recalc_smps(struct ieee80211_local
*local
)
1494 struct ieee80211_sub_if_data
*sdata
;
1495 enum ieee80211_smps_mode smps_mode
= IEEE80211_SMPS_OFF
;
1498 lockdep_assert_held(&local
->iflist_mtx
);
1501 * This function could be improved to handle multiple
1502 * interfaces better, but right now it makes any
1503 * non-station interfaces force SM PS to be turned
1504 * off. If there are multiple station interfaces it
1505 * could also use the best possible mode, e.g. if
1506 * one is in static and the other in dynamic then
1510 list_for_each_entry(sdata
, &local
->interfaces
, list
) {
1511 if (!ieee80211_sdata_running(sdata
))
1513 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
1516 count
+= check_mgd_smps(&sdata
->u
.mgd
, &smps_mode
);
1519 smps_mode
= IEEE80211_SMPS_OFF
;
1524 if (smps_mode
== local
->smps_mode
)
1528 local
->smps_mode
= smps_mode
;
1529 /* changed flag is auto-detected for this */
1530 ieee80211_hw_config(local
, 0);
1533 static bool ieee80211_id_in_list(const u8
*ids
, int n_ids
, u8 id
)
1537 for (i
= 0; i
< n_ids
; i
++)
1544 * ieee80211_ie_split - split an IE buffer according to ordering
1546 * @ies: the IE buffer
1547 * @ielen: the length of the IE buffer
1548 * @ids: an array with element IDs that are allowed before
1550 * @n_ids: the size of the element ID array
1551 * @offset: offset where to start splitting in the buffer
1553 * This function splits an IE buffer by updating the @offset
1554 * variable to point to the location where the buffer should be
1557 * It assumes that the given IE buffer is well-formed, this
1558 * has to be guaranteed by the caller!
1560 * It also assumes that the IEs in the buffer are ordered
1561 * correctly, if not the result of using this function will not
1562 * be ordered correctly either, i.e. it does no reordering.
1564 * The function returns the offset where the next part of the
1565 * buffer starts, which may be @ielen if the entire (remainder)
1566 * of the buffer should be used.
1568 size_t ieee80211_ie_split(const u8
*ies
, size_t ielen
,
1569 const u8
*ids
, int n_ids
, size_t offset
)
1571 size_t pos
= offset
;
1573 while (pos
< ielen
&& ieee80211_id_in_list(ids
, n_ids
, ies
[pos
]))
1574 pos
+= 2 + ies
[pos
+ 1];
1579 size_t ieee80211_ie_split_vendor(const u8
*ies
, size_t ielen
, size_t offset
)
1581 size_t pos
= offset
;
1583 while (pos
< ielen
&& ies
[pos
] != WLAN_EID_VENDOR_SPECIFIC
)
1584 pos
+= 2 + ies
[pos
+ 1];
1589 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data
*sdata
,
1593 trace_api_enable_rssi_reports(sdata
, rssi_min_thold
, rssi_max_thold
);
1595 if (WARN_ON(sdata
->vif
.type
!= NL80211_IFTYPE_STATION
))
1599 * Scale up threshold values before storing it, as the RSSI averaging
1600 * algorithm uses a scaled up value as well. Change this scaling
1601 * factor if the RSSI averaging algorithm changes.
1603 sdata
->u
.mgd
.rssi_min_thold
= rssi_min_thold
*16;
1604 sdata
->u
.mgd
.rssi_max_thold
= rssi_max_thold
*16;
1607 void ieee80211_enable_rssi_reports(struct ieee80211_vif
*vif
,
1611 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
1613 WARN_ON(rssi_min_thold
== rssi_max_thold
||
1614 rssi_min_thold
> rssi_max_thold
);
1616 _ieee80211_enable_rssi_reports(sdata
, rssi_min_thold
,
1619 EXPORT_SYMBOL(ieee80211_enable_rssi_reports
);
1621 void ieee80211_disable_rssi_reports(struct ieee80211_vif
*vif
)
1623 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
1625 _ieee80211_enable_rssi_reports(sdata
, 0, 0);
1627 EXPORT_SYMBOL(ieee80211_disable_rssi_reports
);
1629 u8
*ieee80211_ie_build_ht_cap(u8
*pos
, struct ieee80211_sta_ht_cap
*ht_cap
,
1634 *pos
++ = WLAN_EID_HT_CAPABILITY
;
1635 *pos
++ = sizeof(struct ieee80211_ht_cap
);
1636 memset(pos
, 0, sizeof(struct ieee80211_ht_cap
));
1638 /* capability flags */
1639 tmp
= cpu_to_le16(cap
);
1640 memcpy(pos
, &tmp
, sizeof(u16
));
1643 /* AMPDU parameters */
1644 *pos
++ = ht_cap
->ampdu_factor
|
1645 (ht_cap
->ampdu_density
<<
1646 IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT
);
1649 memcpy(pos
, &ht_cap
->mcs
, sizeof(ht_cap
->mcs
));
1650 pos
+= sizeof(ht_cap
->mcs
);
1652 /* extended capabilities */
1653 pos
+= sizeof(__le16
);
1655 /* BF capabilities */
1656 pos
+= sizeof(__le32
);
1658 /* antenna selection */
1664 u8
*ieee80211_ie_build_ht_oper(u8
*pos
, struct ieee80211_sta_ht_cap
*ht_cap
,
1665 struct ieee80211_channel
*channel
,
1666 enum nl80211_channel_type channel_type
,
1669 struct ieee80211_ht_operation
*ht_oper
;
1670 /* Build HT Information */
1671 *pos
++ = WLAN_EID_HT_OPERATION
;
1672 *pos
++ = sizeof(struct ieee80211_ht_operation
);
1673 ht_oper
= (struct ieee80211_ht_operation
*)pos
;
1674 ht_oper
->primary_chan
=
1675 ieee80211_frequency_to_channel(channel
->center_freq
);
1676 switch (channel_type
) {
1677 case NL80211_CHAN_HT40MINUS
:
1678 ht_oper
->ht_param
= IEEE80211_HT_PARAM_CHA_SEC_BELOW
;
1680 case NL80211_CHAN_HT40PLUS
:
1681 ht_oper
->ht_param
= IEEE80211_HT_PARAM_CHA_SEC_ABOVE
;
1683 case NL80211_CHAN_HT20
:
1685 ht_oper
->ht_param
= IEEE80211_HT_PARAM_CHA_SEC_NONE
;
1688 if (ht_cap
->cap
& IEEE80211_HT_CAP_SUP_WIDTH_20_40
&&
1689 channel_type
!= NL80211_CHAN_NO_HT
&&
1690 channel_type
!= NL80211_CHAN_HT20
)
1691 ht_oper
->ht_param
|= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY
;
1693 ht_oper
->operation_mode
= cpu_to_le16(prot_mode
);
1694 ht_oper
->stbc_param
= 0x0000;
1696 /* It seems that Basic MCS set and Supported MCS set
1697 are identical for the first 10 bytes */
1698 memset(&ht_oper
->basic_set
, 0, 16);
1699 memcpy(&ht_oper
->basic_set
, &ht_cap
->mcs
, 10);
1701 return pos
+ sizeof(struct ieee80211_ht_operation
);
1704 enum nl80211_channel_type
1705 ieee80211_ht_oper_to_channel_type(struct ieee80211_ht_operation
*ht_oper
)
1707 enum nl80211_channel_type channel_type
;
1710 return NL80211_CHAN_NO_HT
;
1712 switch (ht_oper
->ht_param
& IEEE80211_HT_PARAM_CHA_SEC_OFFSET
) {
1713 case IEEE80211_HT_PARAM_CHA_SEC_NONE
:
1714 channel_type
= NL80211_CHAN_HT20
;
1716 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE
:
1717 channel_type
= NL80211_CHAN_HT40PLUS
;
1719 case IEEE80211_HT_PARAM_CHA_SEC_BELOW
:
1720 channel_type
= NL80211_CHAN_HT40MINUS
;
1723 channel_type
= NL80211_CHAN_NO_HT
;
1726 return channel_type
;
1729 int ieee80211_add_srates_ie(struct ieee80211_vif
*vif
,
1730 struct sk_buff
*skb
, bool need_basic
)
1732 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
1733 struct ieee80211_local
*local
= sdata
->local
;
1734 struct ieee80211_supported_band
*sband
;
1737 u32 basic_rates
= vif
->bss_conf
.basic_rates
;
1739 sband
= local
->hw
.wiphy
->bands
[local
->hw
.conf
.channel
->band
];
1740 rates
= sband
->n_bitrates
;
1744 if (skb_tailroom(skb
) < rates
+ 2)
1747 pos
= skb_put(skb
, rates
+ 2);
1748 *pos
++ = WLAN_EID_SUPP_RATES
;
1750 for (i
= 0; i
< rates
; i
++) {
1752 if (need_basic
&& basic_rates
& BIT(i
))
1754 rate
= sband
->bitrates
[i
].bitrate
;
1755 *pos
++ = basic
| (u8
) (rate
/ 5);
1761 int ieee80211_add_ext_srates_ie(struct ieee80211_vif
*vif
,
1762 struct sk_buff
*skb
, bool need_basic
)
1764 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
1765 struct ieee80211_local
*local
= sdata
->local
;
1766 struct ieee80211_supported_band
*sband
;
1768 u8 i
, exrates
, *pos
;
1769 u32 basic_rates
= vif
->bss_conf
.basic_rates
;
1771 sband
= local
->hw
.wiphy
->bands
[local
->hw
.conf
.channel
->band
];
1772 exrates
= sband
->n_bitrates
;
1778 if (skb_tailroom(skb
) < exrates
+ 2)
1782 pos
= skb_put(skb
, exrates
+ 2);
1783 *pos
++ = WLAN_EID_EXT_SUPP_RATES
;
1785 for (i
= 8; i
< sband
->n_bitrates
; i
++) {
1787 if (need_basic
&& basic_rates
& BIT(i
))
1789 rate
= sband
->bitrates
[i
].bitrate
;
1790 *pos
++ = basic
| (u8
) (rate
/ 5);
1796 int ieee80211_ave_rssi(struct ieee80211_vif
*vif
)
1798 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
1799 struct ieee80211_if_managed
*ifmgd
= &sdata
->u
.mgd
;
1801 if (WARN_ON_ONCE(sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)) {
1802 /* non-managed type inferfaces */
1805 return ifmgd
->ave_beacon_signal
;
1807 EXPORT_SYMBOL_GPL(ieee80211_ave_rssi
);