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.
12 * Transmit and frame generation functions.
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/skbuff.h>
18 #include <linux/etherdevice.h>
19 #include <linux/bitmap.h>
20 #include <linux/rcupdate.h>
21 #include <net/net_namespace.h>
22 #include <net/ieee80211_radiotap.h>
23 #include <net/cfg80211.h>
24 #include <net/mac80211.h>
25 #include <asm/unaligned.h>
27 #include "ieee80211_i.h"
35 #define IEEE80211_TX_OK 0
36 #define IEEE80211_TX_AGAIN 1
37 #define IEEE80211_TX_FRAG_AGAIN 2
41 static __le16
ieee80211_duration(struct ieee80211_tx_data
*tx
, int group_addr
,
44 int rate
, mrate
, erp
, dur
, i
;
45 struct ieee80211_rate
*txrate
;
46 struct ieee80211_local
*local
= tx
->local
;
47 struct ieee80211_supported_band
*sband
;
48 struct ieee80211_hdr
*hdr
;
49 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
51 /* assume HW handles this */
52 if (info
->control
.rates
[0].flags
& IEEE80211_TX_RC_MCS
)
56 if (WARN_ON_ONCE(info
->control
.rates
[0].idx
< 0))
59 sband
= local
->hw
.wiphy
->bands
[tx
->channel
->band
];
60 txrate
= &sband
->bitrates
[info
->control
.rates
[0].idx
];
62 erp
= txrate
->flags
& IEEE80211_RATE_ERP_G
;
65 * data and mgmt (except PS Poll):
67 * - during contention period:
68 * if addr1 is group address: 0
69 * if more fragments = 0 and addr1 is individual address: time to
70 * transmit one ACK plus SIFS
71 * if more fragments = 1 and addr1 is individual address: time to
72 * transmit next fragment plus 2 x ACK plus 3 x SIFS
75 * - control response frame (CTS or ACK) shall be transmitted using the
76 * same rate as the immediately previous frame in the frame exchange
77 * sequence, if this rate belongs to the PHY mandatory rates, or else
78 * at the highest possible rate belonging to the PHY rates in the
81 hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
82 if (ieee80211_is_ctl(hdr
->frame_control
)) {
83 /* TODO: These control frames are not currently sent by
84 * mac80211, but should they be implemented, this function
85 * needs to be updated to support duration field calculation.
87 * RTS: time needed to transmit pending data/mgmt frame plus
88 * one CTS frame plus one ACK frame plus 3 x SIFS
89 * CTS: duration of immediately previous RTS minus time
90 * required to transmit CTS and its SIFS
91 * ACK: 0 if immediately previous directed data/mgmt had
92 * more=0, with more=1 duration in ACK frame is duration
93 * from previous frame minus time needed to transmit ACK
95 * PS Poll: BIT(15) | BIT(14) | aid
101 if (0 /* FIX: data/mgmt during CFP */)
102 return cpu_to_le16(32768);
104 if (group_addr
) /* Group address as the destination - no ACK */
107 /* Individual destination address:
108 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
109 * CTS and ACK frames shall be transmitted using the highest rate in
110 * basic rate set that is less than or equal to the rate of the
111 * immediately previous frame and that is using the same modulation
112 * (CCK or OFDM). If no basic rate set matches with these requirements,
113 * the highest mandatory rate of the PHY that is less than or equal to
114 * the rate of the previous frame is used.
115 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
118 /* use lowest available if everything fails */
119 mrate
= sband
->bitrates
[0].bitrate
;
120 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
121 struct ieee80211_rate
*r
= &sband
->bitrates
[i
];
123 if (r
->bitrate
> txrate
->bitrate
)
126 if (tx
->sdata
->vif
.bss_conf
.basic_rates
& BIT(i
))
129 switch (sband
->band
) {
130 case IEEE80211_BAND_2GHZ
: {
132 if (tx
->sdata
->flags
& IEEE80211_SDATA_OPERATING_GMODE
)
133 flag
= IEEE80211_RATE_MANDATORY_G
;
135 flag
= IEEE80211_RATE_MANDATORY_B
;
140 case IEEE80211_BAND_5GHZ
:
141 if (r
->flags
& IEEE80211_RATE_MANDATORY_A
)
144 case IEEE80211_NUM_BANDS
:
150 /* No matching basic rate found; use highest suitable mandatory
155 /* Time needed to transmit ACK
156 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
157 * to closest integer */
159 dur
= ieee80211_frame_duration(local
, 10, rate
, erp
,
160 tx
->sdata
->vif
.bss_conf
.use_short_preamble
);
163 /* Frame is fragmented: duration increases with time needed to
164 * transmit next fragment plus ACK and 2 x SIFS. */
165 dur
*= 2; /* ACK + SIFS */
167 dur
+= ieee80211_frame_duration(local
, next_frag_len
,
168 txrate
->bitrate
, erp
,
169 tx
->sdata
->vif
.bss_conf
.use_short_preamble
);
172 return cpu_to_le16(dur
);
175 static int inline is_ieee80211_device(struct ieee80211_local
*local
,
176 struct net_device
*dev
)
178 return local
== wdev_priv(dev
->ieee80211_ptr
);
183 static ieee80211_tx_result debug_noinline
184 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data
*tx
)
187 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
188 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
191 if (unlikely(info
->flags
& IEEE80211_TX_CTL_INJECTED
))
194 if (unlikely(tx
->local
->sw_scanning
) &&
195 !ieee80211_is_probe_req(hdr
->frame_control
))
198 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
)
201 if (tx
->flags
& IEEE80211_TX_PS_BUFFERED
)
204 sta_flags
= tx
->sta
? get_sta_flags(tx
->sta
) : 0;
206 if (likely(tx
->flags
& IEEE80211_TX_UNICAST
)) {
207 if (unlikely(!(sta_flags
& WLAN_STA_ASSOC
) &&
208 tx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
209 ieee80211_is_data(hdr
->frame_control
))) {
210 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
211 printk(KERN_DEBUG
"%s: dropped data frame to not "
212 "associated station %pM\n",
213 tx
->dev
->name
, hdr
->addr1
);
214 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
215 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_not_assoc
);
219 if (unlikely(ieee80211_is_data(hdr
->frame_control
) &&
220 tx
->local
->num_sta
== 0 &&
221 tx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)) {
223 * No associated STAs - no need to send multicast
234 /* This function is called whenever the AP is about to exceed the maximum limit
235 * of buffered frames for power saving STAs. This situation should not really
236 * happen often during normal operation, so dropping the oldest buffered packet
237 * from each queue should be OK to make some room for new frames. */
238 static void purge_old_ps_buffers(struct ieee80211_local
*local
)
240 int total
= 0, purged
= 0;
242 struct ieee80211_sub_if_data
*sdata
;
243 struct sta_info
*sta
;
246 * virtual interfaces are protected by RCU
250 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
251 struct ieee80211_if_ap
*ap
;
252 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
255 skb
= skb_dequeue(&ap
->ps_bc_buf
);
260 total
+= skb_queue_len(&ap
->ps_bc_buf
);
263 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
264 skb
= skb_dequeue(&sta
->ps_tx_buf
);
269 total
+= skb_queue_len(&sta
->ps_tx_buf
);
274 local
->total_ps_buffered
= total
;
275 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
276 printk(KERN_DEBUG
"%s: PS buffers full - purged %d frames\n",
277 wiphy_name(local
->hw
.wiphy
), purged
);
281 static ieee80211_tx_result
282 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data
*tx
)
284 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
285 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
288 * broadcast/multicast frame
290 * If any of the associated stations is in power save mode,
291 * the frame is buffered to be sent after DTIM beacon frame.
292 * This is done either by the hardware or us.
295 /* powersaving STAs only in AP/VLAN mode */
299 /* no buffering for ordered frames */
300 if (ieee80211_has_order(hdr
->frame_control
))
303 /* no stations in PS mode */
304 if (!atomic_read(&tx
->sdata
->bss
->num_sta_ps
))
307 /* buffered in mac80211 */
308 if (tx
->local
->hw
.flags
& IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING
) {
309 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
310 purge_old_ps_buffers(tx
->local
);
311 if (skb_queue_len(&tx
->sdata
->bss
->ps_bc_buf
) >=
313 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
314 if (net_ratelimit()) {
315 printk(KERN_DEBUG
"%s: BC TX buffer full - "
316 "dropping the oldest frame\n",
320 dev_kfree_skb(skb_dequeue(&tx
->sdata
->bss
->ps_bc_buf
));
322 tx
->local
->total_ps_buffered
++;
323 skb_queue_tail(&tx
->sdata
->bss
->ps_bc_buf
, tx
->skb
);
327 /* buffered in hardware */
328 info
->flags
|= IEEE80211_TX_CTL_SEND_AFTER_DTIM
;
333 static int ieee80211_use_mfp(__le16 fc
, struct sta_info
*sta
,
336 if (!ieee80211_is_mgmt(fc
))
339 if (sta
== NULL
|| !test_sta_flags(sta
, WLAN_STA_MFP
))
342 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr
*)
349 static ieee80211_tx_result
350 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data
*tx
)
352 struct sta_info
*sta
= tx
->sta
;
353 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
354 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
357 if (unlikely(!sta
|| ieee80211_is_probe_resp(hdr
->frame_control
)))
360 staflags
= get_sta_flags(sta
);
362 if (unlikely((staflags
& WLAN_STA_PS
) &&
363 !(staflags
& WLAN_STA_PSPOLL
))) {
364 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
365 printk(KERN_DEBUG
"STA %pM aid %d: PS buffer (entries "
367 sta
->sta
.addr
, sta
->sta
.aid
,
368 skb_queue_len(&sta
->ps_tx_buf
));
369 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
370 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
371 purge_old_ps_buffers(tx
->local
);
372 if (skb_queue_len(&sta
->ps_tx_buf
) >= STA_MAX_TX_BUFFER
) {
373 struct sk_buff
*old
= skb_dequeue(&sta
->ps_tx_buf
);
374 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
375 if (net_ratelimit()) {
376 printk(KERN_DEBUG
"%s: STA %pM TX "
377 "buffer full - dropping oldest frame\n",
378 tx
->dev
->name
, sta
->sta
.addr
);
383 tx
->local
->total_ps_buffered
++;
385 /* Queue frame to be sent after STA sends an PS Poll frame */
386 if (skb_queue_empty(&sta
->ps_tx_buf
))
387 sta_info_set_tim_bit(sta
);
389 info
->control
.jiffies
= jiffies
;
390 skb_queue_tail(&sta
->ps_tx_buf
, tx
->skb
);
393 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
394 else if (unlikely(test_sta_flags(sta
, WLAN_STA_PS
))) {
395 printk(KERN_DEBUG
"%s: STA %pM in PS mode, but pspoll "
396 "set -> send frame\n", tx
->dev
->name
,
399 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
400 clear_sta_flags(sta
, WLAN_STA_PSPOLL
);
405 static ieee80211_tx_result debug_noinline
406 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data
*tx
)
408 if (unlikely(tx
->flags
& IEEE80211_TX_PS_BUFFERED
))
411 if (tx
->flags
& IEEE80211_TX_UNICAST
)
412 return ieee80211_tx_h_unicast_ps_buf(tx
);
414 return ieee80211_tx_h_multicast_ps_buf(tx
);
417 static ieee80211_tx_result debug_noinline
418 ieee80211_tx_h_select_key(struct ieee80211_tx_data
*tx
)
420 struct ieee80211_key
*key
;
421 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
422 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
424 if (unlikely(tx
->skb
->do_not_encrypt
))
426 else if (tx
->sta
&& (key
= rcu_dereference(tx
->sta
->key
)))
428 else if (ieee80211_is_mgmt(hdr
->frame_control
) &&
429 (key
= rcu_dereference(tx
->sdata
->default_mgmt_key
)))
431 else if ((key
= rcu_dereference(tx
->sdata
->default_key
)))
433 else if (tx
->sdata
->drop_unencrypted
&&
434 (tx
->skb
->protocol
!= cpu_to_be16(ETH_P_PAE
)) &&
435 !(info
->flags
& IEEE80211_TX_CTL_INJECTED
) &&
436 (!ieee80211_is_robust_mgmt_frame(hdr
) ||
437 (ieee80211_is_action(hdr
->frame_control
) &&
438 tx
->sta
&& test_sta_flags(tx
->sta
, WLAN_STA_MFP
)))) {
439 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unencrypted
);
445 tx
->key
->tx_rx_count
++;
446 /* TODO: add threshold stuff again */
448 switch (tx
->key
->conf
.alg
) {
450 if (ieee80211_is_auth(hdr
->frame_control
))
453 if (!ieee80211_is_data_present(hdr
->frame_control
))
457 if (!ieee80211_is_data_present(hdr
->frame_control
) &&
458 !ieee80211_use_mfp(hdr
->frame_control
, tx
->sta
,
463 if (!ieee80211_is_mgmt(hdr
->frame_control
))
469 if (!tx
->key
|| !(tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
))
470 tx
->skb
->do_not_encrypt
= 1;
475 static ieee80211_tx_result debug_noinline
476 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data
*tx
)
478 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
479 struct ieee80211_hdr
*hdr
= (void *)tx
->skb
->data
;
480 struct ieee80211_supported_band
*sband
;
481 struct ieee80211_rate
*rate
;
483 bool inval
= false, rts
= false, short_preamble
= false;
484 struct ieee80211_tx_rate_control txrc
;
486 memset(&txrc
, 0, sizeof(txrc
));
488 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
490 len
= min_t(int, tx
->skb
->len
+ FCS_LEN
,
491 tx
->local
->fragmentation_threshold
);
493 /* set up the tx rate control struct we give the RC algo */
494 txrc
.hw
= local_to_hw(tx
->local
);
496 txrc
.bss_conf
= &tx
->sdata
->vif
.bss_conf
;
498 txrc
.reported_rate
.idx
= -1;
499 txrc
.max_rate_idx
= tx
->sdata
->max_ratectrl_rateidx
;
501 /* set up RTS protection if desired */
502 if (tx
->local
->rts_threshold
< IEEE80211_MAX_RTS_THRESHOLD
&&
503 len
> tx
->local
->rts_threshold
) {
504 txrc
.rts
= rts
= true;
508 * Use short preamble if the BSS can handle it, but not for
509 * management frames unless we know the receiver can handle
510 * that -- the management frame might be to a station that
511 * just wants a probe response.
513 if (tx
->sdata
->vif
.bss_conf
.use_short_preamble
&&
514 (ieee80211_is_data(hdr
->frame_control
) ||
515 (tx
->sta
&& test_sta_flags(tx
->sta
, WLAN_STA_SHORT_PREAMBLE
))))
516 txrc
.short_preamble
= short_preamble
= true;
519 rate_control_get_rate(tx
->sdata
, tx
->sta
, &txrc
);
521 if (unlikely(info
->control
.rates
[0].idx
< 0))
524 if (txrc
.reported_rate
.idx
< 0)
525 txrc
.reported_rate
= info
->control
.rates
[0];
528 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
530 if (unlikely(!info
->control
.rates
[0].count
))
531 info
->control
.rates
[0].count
= 1;
533 if (is_multicast_ether_addr(hdr
->addr1
)) {
535 * XXX: verify the rate is in the basic rateset
541 * set up the RTS/CTS rate as the fastest basic rate
542 * that is not faster than the data rate
544 * XXX: Should this check all retry rates?
546 if (!(info
->control
.rates
[0].flags
& IEEE80211_TX_RC_MCS
)) {
549 rate
= &sband
->bitrates
[info
->control
.rates
[0].idx
];
551 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
552 /* must be a basic rate */
553 if (!(tx
->sdata
->vif
.bss_conf
.basic_rates
& BIT(i
)))
555 /* must not be faster than the data rate */
556 if (sband
->bitrates
[i
].bitrate
> rate
->bitrate
)
559 if (sband
->bitrates
[baserate
].bitrate
<
560 sband
->bitrates
[i
].bitrate
)
564 info
->control
.rts_cts_rate_idx
= baserate
;
567 for (i
= 0; i
< IEEE80211_TX_MAX_RATES
; i
++) {
569 * make sure there's no valid rate following
570 * an invalid one, just in case drivers don't
571 * take the API seriously to stop at -1.
574 info
->control
.rates
[i
].idx
= -1;
577 if (info
->control
.rates
[i
].idx
< 0) {
583 * For now assume MCS is already set up correctly, this
586 if (info
->control
.rates
[i
].flags
& IEEE80211_TX_RC_MCS
) {
587 WARN_ON(info
->control
.rates
[i
].idx
> 76);
591 /* set up RTS protection if desired */
593 info
->control
.rates
[i
].flags
|=
594 IEEE80211_TX_RC_USE_RTS_CTS
;
597 if (WARN_ON_ONCE(info
->control
.rates
[i
].idx
>=
598 sband
->n_bitrates
)) {
599 info
->control
.rates
[i
].idx
= -1;
603 rate
= &sband
->bitrates
[info
->control
.rates
[i
].idx
];
605 /* set up short preamble */
606 if (short_preamble
&&
607 rate
->flags
& IEEE80211_RATE_SHORT_PREAMBLE
)
608 info
->control
.rates
[i
].flags
|=
609 IEEE80211_TX_RC_USE_SHORT_PREAMBLE
;
611 /* set up G protection */
612 if (!rts
&& tx
->sdata
->vif
.bss_conf
.use_cts_prot
&&
613 rate
->flags
& IEEE80211_RATE_ERP_G
)
614 info
->control
.rates
[i
].flags
|=
615 IEEE80211_TX_RC_USE_CTS_PROTECT
;
621 static ieee80211_tx_result debug_noinline
622 ieee80211_tx_h_misc(struct ieee80211_tx_data
*tx
)
624 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
627 info
->control
.sta
= &tx
->sta
->sta
;
632 static ieee80211_tx_result debug_noinline
633 ieee80211_tx_h_sequence(struct ieee80211_tx_data
*tx
)
635 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
636 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
642 * Packet injection may want to control the sequence
643 * number, if we have no matching interface then we
644 * neither assign one ourselves nor ask the driver to.
646 if (unlikely(!info
->control
.vif
))
649 if (unlikely(ieee80211_is_ctl(hdr
->frame_control
)))
652 if (ieee80211_hdrlen(hdr
->frame_control
) < 24)
656 * Anything but QoS data that has a sequence number field
657 * (is long enough) gets a sequence number from the global
660 if (!ieee80211_is_data_qos(hdr
->frame_control
)) {
661 /* driver should assign sequence number */
662 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
663 /* for pure STA mode without beacons, we can do it */
664 hdr
->seq_ctrl
= cpu_to_le16(tx
->sdata
->sequence_number
);
665 tx
->sdata
->sequence_number
+= 0x10;
666 tx
->sdata
->sequence_number
&= IEEE80211_SCTL_SEQ
;
671 * This should be true for injected/management frames only, for
672 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
673 * above since they are not QoS-data frames.
678 /* include per-STA, per-TID sequence counter */
680 qc
= ieee80211_get_qos_ctl(hdr
);
681 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
682 seq
= &tx
->sta
->tid_seq
[tid
];
684 hdr
->seq_ctrl
= cpu_to_le16(*seq
);
686 /* Increase the sequence number. */
687 *seq
= (*seq
+ 0x10) & IEEE80211_SCTL_SEQ
;
692 static ieee80211_tx_result debug_noinline
693 ieee80211_tx_h_fragment(struct ieee80211_tx_data
*tx
)
695 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
696 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
697 size_t hdrlen
, per_fragm
, num_fragm
, payload_len
, left
;
698 struct sk_buff
**frags
, *first
, *frag
;
702 int frag_threshold
= tx
->local
->fragmentation_threshold
;
704 if (!(tx
->flags
& IEEE80211_TX_FRAGMENTED
))
708 * Warn when submitting a fragmented A-MPDU frame and drop it.
709 * This scenario is handled in __ieee80211_tx_prepare but extra
710 * caution taken here as fragmented ampdu may cause Tx stop.
712 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
717 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
718 payload_len
= first
->len
- hdrlen
;
719 per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
720 num_fragm
= DIV_ROUND_UP(payload_len
, per_fragm
);
722 frags
= kzalloc(num_fragm
* sizeof(struct sk_buff
*), GFP_ATOMIC
);
726 hdr
->frame_control
|= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
727 seq
= le16_to_cpu(hdr
->seq_ctrl
) & IEEE80211_SCTL_SEQ
;
728 pos
= first
->data
+ hdrlen
+ per_fragm
;
729 left
= payload_len
- per_fragm
;
730 for (i
= 0; i
< num_fragm
- 1; i
++) {
731 struct ieee80211_hdr
*fhdr
;
737 /* reserve enough extra head and tail room for possible
740 dev_alloc_skb(tx
->local
->tx_headroom
+
742 IEEE80211_ENCRYPT_HEADROOM
+
743 IEEE80211_ENCRYPT_TAILROOM
);
747 /* Make sure that all fragments use the same priority so
748 * that they end up using the same TX queue */
749 frag
->priority
= first
->priority
;
751 skb_reserve(frag
, tx
->local
->tx_headroom
+
752 IEEE80211_ENCRYPT_HEADROOM
);
754 /* copy TX information */
755 info
= IEEE80211_SKB_CB(frag
);
756 memcpy(info
, first
->cb
, sizeof(frag
->cb
));
758 /* copy/fill in 802.11 header */
759 fhdr
= (struct ieee80211_hdr
*) skb_put(frag
, hdrlen
);
760 memcpy(fhdr
, first
->data
, hdrlen
);
761 fhdr
->seq_ctrl
= cpu_to_le16(seq
| ((i
+ 1) & IEEE80211_SCTL_FRAG
));
763 if (i
== num_fragm
- 2) {
764 /* clear MOREFRAGS bit for the last fragment */
765 fhdr
->frame_control
&= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS
);
768 * No multi-rate retries for fragmented frames, that
769 * would completely throw off the NAV at other STAs.
771 info
->control
.rates
[1].idx
= -1;
772 info
->control
.rates
[2].idx
= -1;
773 info
->control
.rates
[3].idx
= -1;
774 info
->control
.rates
[4].idx
= -1;
775 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES
!= 5);
776 info
->flags
&= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
780 copylen
= left
> per_fragm
? per_fragm
: left
;
781 memcpy(skb_put(frag
, copylen
), pos
, copylen
);
783 skb_copy_queue_mapping(frag
, first
);
785 frag
->do_not_encrypt
= first
->do_not_encrypt
;
790 skb_trim(first
, hdrlen
+ per_fragm
);
792 tx
->num_extra_frag
= num_fragm
- 1;
793 tx
->extra_frag
= frags
;
799 for (i
= 0; i
< num_fragm
- 1; i
++)
801 dev_kfree_skb(frags
[i
]);
804 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_fragment
);
808 static ieee80211_tx_result debug_noinline
809 ieee80211_tx_h_encrypt(struct ieee80211_tx_data
*tx
)
814 switch (tx
->key
->conf
.alg
) {
816 return ieee80211_crypto_wep_encrypt(tx
);
818 return ieee80211_crypto_tkip_encrypt(tx
);
820 return ieee80211_crypto_ccmp_encrypt(tx
);
822 return ieee80211_crypto_aes_cmac_encrypt(tx
);
830 static ieee80211_tx_result debug_noinline
831 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data
*tx
)
833 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
835 int group_addr
= is_multicast_ether_addr(hdr
->addr1
);
837 if (!(tx
->flags
& IEEE80211_TX_FRAGMENTED
)) {
838 hdr
->duration_id
= ieee80211_duration(tx
, group_addr
, 0);
842 hdr
->duration_id
= ieee80211_duration(tx
, group_addr
,
843 tx
->extra_frag
[0]->len
);
845 for (i
= 0; i
< tx
->num_extra_frag
; i
++) {
846 if (i
+ 1 < tx
->num_extra_frag
)
847 next_len
= tx
->extra_frag
[i
+ 1]->len
;
851 hdr
= (struct ieee80211_hdr
*)tx
->extra_frag
[i
]->data
;
852 hdr
->duration_id
= ieee80211_duration(tx
, 0, next_len
);
858 static ieee80211_tx_result debug_noinline
859 ieee80211_tx_h_stats(struct ieee80211_tx_data
*tx
)
866 tx
->sta
->tx_packets
++;
867 tx
->sta
->tx_fragments
++;
868 tx
->sta
->tx_bytes
+= tx
->skb
->len
;
869 if (tx
->extra_frag
) {
870 tx
->sta
->tx_fragments
+= tx
->num_extra_frag
;
871 for (i
= 0; i
< tx
->num_extra_frag
; i
++)
872 tx
->sta
->tx_bytes
+= tx
->extra_frag
[i
]->len
;
879 /* actual transmit path */
882 * deal with packet injection down monitor interface
883 * with Radiotap Header -- only called for monitor mode interface
885 static ieee80211_tx_result
886 __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data
*tx
,
890 * this is the moment to interpret and discard the radiotap header that
891 * must be at the start of the packet injected in Monitor mode
893 * Need to take some care with endian-ness since radiotap
894 * args are little-endian
897 struct ieee80211_radiotap_iterator iterator
;
898 struct ieee80211_radiotap_header
*rthdr
=
899 (struct ieee80211_radiotap_header
*) skb
->data
;
900 struct ieee80211_supported_band
*sband
;
901 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
);
903 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
905 skb
->do_not_encrypt
= 1;
906 tx
->flags
&= ~IEEE80211_TX_FRAGMENTED
;
909 * for every radiotap entry that is present
910 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
911 * entries present, or -EINVAL on error)
915 ret
= ieee80211_radiotap_iterator_next(&iterator
);
920 /* see if this argument is something we can use */
921 switch (iterator
.this_arg_index
) {
923 * You must take care when dereferencing iterator.this_arg
924 * for multibyte types... the pointer is not aligned. Use
925 * get_unaligned((type *)iterator.this_arg) to dereference
926 * iterator.this_arg for type "type" safely on all arches.
928 case IEEE80211_RADIOTAP_FLAGS
:
929 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
931 * this indicates that the skb we have been
932 * handed has the 32-bit FCS CRC at the end...
933 * we should react to that by snipping it off
934 * because it will be recomputed and added
937 if (skb
->len
< (iterator
.max_length
+ FCS_LEN
))
940 skb_trim(skb
, skb
->len
- FCS_LEN
);
942 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_WEP
)
943 tx
->skb
->do_not_encrypt
= 0;
944 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FRAG
)
945 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
949 * Please update the file
950 * Documentation/networking/mac80211-injection.txt
951 * when parsing new fields here.
959 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
963 * remove the radiotap header
964 * iterator->max_length was sanity-checked against
965 * skb->len by iterator init
967 skb_pull(skb
, iterator
.max_length
);
975 static ieee80211_tx_result
976 __ieee80211_tx_prepare(struct ieee80211_tx_data
*tx
,
978 struct net_device
*dev
)
980 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
981 struct ieee80211_hdr
*hdr
;
982 struct ieee80211_sub_if_data
*sdata
;
983 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
988 memset(tx
, 0, sizeof(*tx
));
990 tx
->dev
= dev
; /* use original interface */
992 tx
->sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
993 tx
->channel
= local
->hw
.conf
.channel
;
995 * Set this flag (used below to indicate "automatic fragmentation"),
996 * it will be cleared/left by radiotap as desired.
998 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
1000 /* process and remove the injection radiotap header */
1001 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1002 if (unlikely(info
->flags
& IEEE80211_TX_CTL_INJECTED
)) {
1003 if (__ieee80211_parse_tx_radiotap(tx
, skb
) == TX_DROP
)
1007 * __ieee80211_parse_tx_radiotap has now removed
1008 * the radiotap header that was present and pre-filled
1009 * 'tx' with tx control information.
1013 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1015 tx
->sta
= sta_info_get(local
, hdr
->addr1
);
1017 if (tx
->sta
&& ieee80211_is_data_qos(hdr
->frame_control
)) {
1018 qc
= ieee80211_get_qos_ctl(hdr
);
1019 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
1021 state
= &tx
->sta
->ampdu_mlme
.tid_state_tx
[tid
];
1022 if (*state
== HT_AGG_STATE_OPERATIONAL
)
1023 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1026 if (is_multicast_ether_addr(hdr
->addr1
)) {
1027 tx
->flags
&= ~IEEE80211_TX_UNICAST
;
1028 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1030 tx
->flags
|= IEEE80211_TX_UNICAST
;
1031 info
->flags
&= ~IEEE80211_TX_CTL_NO_ACK
;
1034 if (tx
->flags
& IEEE80211_TX_FRAGMENTED
) {
1035 if ((tx
->flags
& IEEE80211_TX_UNICAST
) &&
1036 skb
->len
+ FCS_LEN
> local
->fragmentation_threshold
&&
1037 !(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
1038 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
1040 tx
->flags
&= ~IEEE80211_TX_FRAGMENTED
;
1044 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1045 else if (test_and_clear_sta_flags(tx
->sta
, WLAN_STA_CLEAR_PS_FILT
))
1046 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1048 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1049 if (skb
->len
> hdrlen
+ sizeof(rfc1042_header
) + 2) {
1050 u8
*pos
= &skb
->data
[hdrlen
+ sizeof(rfc1042_header
)];
1051 tx
->ethertype
= (pos
[0] << 8) | pos
[1];
1053 info
->flags
|= IEEE80211_TX_CTL_FIRST_FRAGMENT
;
1059 * NB: @tx is uninitialised when passed in here
1061 static int ieee80211_tx_prepare(struct ieee80211_local
*local
,
1062 struct ieee80211_tx_data
*tx
,
1063 struct sk_buff
*skb
)
1065 struct net_device
*dev
;
1067 dev
= dev_get_by_index(&init_net
, skb
->iif
);
1068 if (unlikely(dev
&& !is_ieee80211_device(local
, dev
))) {
1074 /* initialises tx with control */
1075 __ieee80211_tx_prepare(tx
, skb
, dev
);
1080 static int __ieee80211_tx(struct ieee80211_local
*local
, struct sk_buff
*skb
,
1081 struct ieee80211_tx_data
*tx
)
1083 struct ieee80211_tx_info
*info
;
1087 if (netif_subqueue_stopped(local
->mdev
, skb
))
1088 return IEEE80211_TX_AGAIN
;
1090 ret
= local
->ops
->tx(local_to_hw(local
), skb
);
1092 return IEEE80211_TX_AGAIN
;
1093 local
->mdev
->trans_start
= jiffies
;
1094 ieee80211_led_tx(local
, 1);
1096 if (tx
->extra_frag
) {
1097 for (i
= 0; i
< tx
->num_extra_frag
; i
++) {
1098 if (!tx
->extra_frag
[i
])
1100 info
= IEEE80211_SKB_CB(tx
->extra_frag
[i
]);
1101 info
->flags
&= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT
|
1102 IEEE80211_TX_CTL_FIRST_FRAGMENT
);
1103 if (netif_subqueue_stopped(local
->mdev
,
1105 return IEEE80211_TX_FRAG_AGAIN
;
1107 ret
= local
->ops
->tx(local_to_hw(local
),
1110 return IEEE80211_TX_FRAG_AGAIN
;
1111 local
->mdev
->trans_start
= jiffies
;
1112 ieee80211_led_tx(local
, 1);
1113 tx
->extra_frag
[i
] = NULL
;
1115 kfree(tx
->extra_frag
);
1116 tx
->extra_frag
= NULL
;
1118 return IEEE80211_TX_OK
;
1122 * Invoke TX handlers, return 0 on success and non-zero if the
1123 * frame was dropped or queued.
1125 static int invoke_tx_handlers(struct ieee80211_tx_data
*tx
)
1127 struct sk_buff
*skb
= tx
->skb
;
1128 ieee80211_tx_result res
= TX_DROP
;
1131 #define CALL_TXH(txh) \
1133 if (res != TX_CONTINUE) \
1136 CALL_TXH(ieee80211_tx_h_check_assoc
)
1137 CALL_TXH(ieee80211_tx_h_ps_buf
)
1138 CALL_TXH(ieee80211_tx_h_select_key
)
1139 CALL_TXH(ieee80211_tx_h_michael_mic_add
)
1140 CALL_TXH(ieee80211_tx_h_rate_ctrl
)
1141 CALL_TXH(ieee80211_tx_h_misc
)
1142 CALL_TXH(ieee80211_tx_h_sequence
)
1143 CALL_TXH(ieee80211_tx_h_fragment
)
1144 /* handlers after fragment must be aware of tx info fragmentation! */
1145 CALL_TXH(ieee80211_tx_h_encrypt
)
1146 CALL_TXH(ieee80211_tx_h_calculate_duration
)
1147 CALL_TXH(ieee80211_tx_h_stats
)
1151 if (unlikely(res
== TX_DROP
)) {
1152 I802_DEBUG_INC(tx
->local
->tx_handlers_drop
);
1154 for (i
= 0; i
< tx
->num_extra_frag
; i
++)
1155 if (tx
->extra_frag
[i
])
1156 dev_kfree_skb(tx
->extra_frag
[i
]);
1157 kfree(tx
->extra_frag
);
1159 } else if (unlikely(res
== TX_QUEUED
)) {
1160 I802_DEBUG_INC(tx
->local
->tx_handlers_queued
);
1167 static int ieee80211_tx(struct net_device
*dev
, struct sk_buff
*skb
)
1169 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1170 struct sta_info
*sta
;
1171 struct ieee80211_tx_data tx
;
1172 ieee80211_tx_result res_prepare
;
1173 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1177 queue
= skb_get_queue_mapping(skb
);
1179 WARN_ON(test_bit(queue
, local
->queues_pending
));
1181 if (unlikely(skb
->len
< 10)) {
1188 /* initialises tx */
1189 res_prepare
= __ieee80211_tx_prepare(&tx
, skb
, dev
);
1191 if (res_prepare
== TX_DROP
) {
1198 tx
.channel
= local
->hw
.conf
.channel
;
1199 info
->band
= tx
.channel
->band
;
1201 if (invoke_tx_handlers(&tx
))
1205 ret
= __ieee80211_tx(local
, skb
, &tx
);
1207 struct ieee80211_tx_stored_packet
*store
;
1210 * Since there are no fragmented frames on A-MPDU
1211 * queues, there's no reason for a driver to reject
1212 * a frame there, warn and drop it.
1214 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
1217 store
= &local
->pending_packet
[queue
];
1219 if (ret
== IEEE80211_TX_FRAG_AGAIN
)
1222 set_bit(queue
, local
->queues_pending
);
1225 * When the driver gets out of buffers during sending of
1226 * fragments and calls ieee80211_stop_queue, the netif
1227 * subqueue is stopped. There is, however, a small window
1228 * in which the PENDING bit is not yet set. If a buffer
1229 * gets available in that window (i.e. driver calls
1230 * ieee80211_wake_queue), we would end up with ieee80211_tx
1231 * called with the PENDING bit still set. Prevent this by
1232 * continuing transmitting here when that situation is
1233 * possible to have happened.
1235 if (!__netif_subqueue_stopped(local
->mdev
, queue
)) {
1236 clear_bit(queue
, local
->queues_pending
);
1240 store
->extra_frag
= tx
.extra_frag
;
1241 store
->num_extra_frag
= tx
.num_extra_frag
;
1250 for (i
= 0; i
< tx
.num_extra_frag
; i
++)
1251 if (tx
.extra_frag
[i
])
1252 dev_kfree_skb(tx
.extra_frag
[i
]);
1253 kfree(tx
.extra_frag
);
1258 /* device xmit handlers */
1260 static int ieee80211_skb_resize(struct ieee80211_local
*local
,
1261 struct sk_buff
*skb
,
1262 int head_need
, bool may_encrypt
)
1267 * This could be optimised, devices that do full hardware
1268 * crypto (including TKIP MMIC) need no tailroom... But we
1269 * have no drivers for such devices currently.
1272 tail_need
= IEEE80211_ENCRYPT_TAILROOM
;
1273 tail_need
-= skb_tailroom(skb
);
1274 tail_need
= max_t(int, tail_need
, 0);
1277 if (head_need
|| tail_need
) {
1278 /* Sorry. Can't account for this any more */
1282 if (skb_header_cloned(skb
))
1283 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1285 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1287 if (pskb_expand_head(skb
, head_need
, tail_need
, GFP_ATOMIC
)) {
1288 printk(KERN_DEBUG
"%s: failed to reallocate TX buffer\n",
1289 wiphy_name(local
->hw
.wiphy
));
1293 /* update truesize too */
1294 skb
->truesize
+= head_need
+ tail_need
;
1299 int ieee80211_master_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
1301 struct ieee80211_master_priv
*mpriv
= netdev_priv(dev
);
1302 struct ieee80211_local
*local
= mpriv
->local
;
1303 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1304 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1305 struct net_device
*odev
= NULL
;
1306 struct ieee80211_sub_if_data
*osdata
;
1313 } monitor_iface
= NOT_MONITOR
;
1317 odev
= dev_get_by_index(&init_net
, skb
->iif
);
1318 if (unlikely(odev
&& !is_ieee80211_device(local
, odev
))) {
1322 if (unlikely(!odev
)) {
1323 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1324 printk(KERN_DEBUG
"%s: Discarded packet with nonexistent "
1325 "originating device\n", dev
->name
);
1331 if ((local
->hw
.flags
& IEEE80211_HW_PS_NULLFUNC_STACK
) &&
1332 local
->hw
.conf
.dynamic_ps_timeout
> 0) {
1333 if (local
->hw
.conf
.flags
& IEEE80211_CONF_PS
) {
1334 ieee80211_stop_queues_by_reason(&local
->hw
,
1335 IEEE80211_QUEUE_STOP_REASON_PS
);
1336 queue_work(local
->hw
.workqueue
,
1337 &local
->dynamic_ps_disable_work
);
1340 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
1341 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
1344 memset(info
, 0, sizeof(*info
));
1346 info
->flags
|= IEEE80211_TX_CTL_REQ_TX_STATUS
;
1348 osdata
= IEEE80211_DEV_TO_SUB_IF(odev
);
1350 if (ieee80211_vif_is_mesh(&osdata
->vif
) &&
1351 ieee80211_is_data(hdr
->frame_control
)) {
1352 if (is_multicast_ether_addr(hdr
->addr3
))
1353 memcpy(hdr
->addr1
, hdr
->addr3
, ETH_ALEN
);
1355 if (mesh_nexthop_lookup(skb
, osdata
)) {
1359 if (memcmp(odev
->dev_addr
, hdr
->addr4
, ETH_ALEN
) != 0)
1360 IEEE80211_IFSTA_MESH_CTR_INC(&osdata
->u
.mesh
,
1362 } else if (unlikely(osdata
->vif
.type
== NL80211_IFTYPE_MONITOR
)) {
1363 struct ieee80211_sub_if_data
*sdata
;
1367 info
->flags
|= IEEE80211_TX_CTL_INJECTED
;
1368 monitor_iface
= UNKNOWN_ADDRESS
;
1370 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1371 hdr
= (struct ieee80211_hdr
*)skb
->data
+ len_rthdr
;
1372 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1374 /* check the header is complete in the frame */
1375 if (likely(skb
->len
>= len_rthdr
+ hdrlen
)) {
1377 * We process outgoing injected frames that have a
1378 * local address we handle as though they are our
1380 * This code here isn't entirely correct, the local
1381 * MAC address is not necessarily enough to find
1382 * the interface to use; for that proper VLAN/WDS
1383 * support we will need a different mechanism.
1387 list_for_each_entry_rcu(sdata
, &local
->interfaces
,
1389 if (!netif_running(sdata
->dev
))
1391 if (compare_ether_addr(sdata
->dev
->dev_addr
,
1393 dev_hold(sdata
->dev
);
1397 skb
->iif
= sdata
->dev
->ifindex
;
1398 monitor_iface
= FOUND_SDATA
;
1406 may_encrypt
= !skb
->do_not_encrypt
;
1408 headroom
= osdata
->local
->tx_headroom
;
1410 headroom
+= IEEE80211_ENCRYPT_HEADROOM
;
1411 headroom
-= skb_headroom(skb
);
1412 headroom
= max_t(int, 0, headroom
);
1414 if (ieee80211_skb_resize(osdata
->local
, skb
, headroom
, may_encrypt
)) {
1420 if (osdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
1421 osdata
= container_of(osdata
->bss
,
1422 struct ieee80211_sub_if_data
,
1424 if (likely(monitor_iface
!= UNKNOWN_ADDRESS
))
1425 info
->control
.vif
= &osdata
->vif
;
1426 ret
= ieee80211_tx(odev
, skb
);
1432 int ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1433 struct net_device
*dev
)
1435 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1436 struct ieee80211_radiotap_header
*prthdr
=
1437 (struct ieee80211_radiotap_header
*)skb
->data
;
1440 /* check for not even having the fixed radiotap header part */
1441 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1442 goto fail
; /* too short to be possibly valid */
1444 /* is it a header version we can trust to find length from? */
1445 if (unlikely(prthdr
->it_version
))
1446 goto fail
; /* only version 0 is supported */
1448 /* then there must be a radiotap header with a length we can use */
1449 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1451 /* does the skb contain enough to deliver on the alleged length? */
1452 if (unlikely(skb
->len
< len_rthdr
))
1453 goto fail
; /* skb too short for claimed rt header extent */
1455 skb
->dev
= local
->mdev
;
1457 /* needed because we set skb device to master */
1458 skb
->iif
= dev
->ifindex
;
1460 /* sometimes we do encrypt injected frames, will be fixed
1461 * up in radiotap parser if not wanted */
1462 skb
->do_not_encrypt
= 0;
1465 * fix up the pointers accounting for the radiotap
1466 * header still being in there. We are being given
1467 * a precooked IEEE80211 header so no need for
1470 skb_set_mac_header(skb
, len_rthdr
);
1472 * these are just fixed to the end of the rt area since we
1473 * don't have any better information and at this point, nobody cares
1475 skb_set_network_header(skb
, len_rthdr
);
1476 skb_set_transport_header(skb
, len_rthdr
);
1478 /* pass the radiotap header up to the next stage intact */
1479 dev_queue_xmit(skb
);
1480 return NETDEV_TX_OK
;
1484 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1488 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1489 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1490 * @skb: packet to be sent
1491 * @dev: incoming interface
1493 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1494 * not be freed, and caller is responsible for either retrying later or freeing
1497 * This function takes in an Ethernet header and encapsulates it with suitable
1498 * IEEE 802.11 header based on which interface the packet is coming in. The
1499 * encapsulated packet will then be passed to master interface, wlan#.11, for
1500 * transmission (through low-level driver).
1502 int ieee80211_subif_start_xmit(struct sk_buff
*skb
,
1503 struct net_device
*dev
)
1505 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1506 struct ieee80211_local
*local
= sdata
->local
;
1507 int ret
= 1, head_need
;
1508 u16 ethertype
, hdrlen
, meshhdrlen
= 0;
1510 struct ieee80211_hdr hdr
;
1511 struct ieee80211s_hdr mesh_hdr
;
1512 const u8
*encaps_data
;
1513 int encaps_len
, skip_header_bytes
;
1515 struct sta_info
*sta
;
1518 if (unlikely(skb
->len
< ETH_HLEN
)) {
1523 nh_pos
= skb_network_header(skb
) - skb
->data
;
1524 h_pos
= skb_transport_header(skb
) - skb
->data
;
1526 /* convert Ethernet header to proper 802.11 header (based on
1527 * operation mode) */
1528 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1529 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
);
1531 switch (sdata
->vif
.type
) {
1532 case NL80211_IFTYPE_AP
:
1533 case NL80211_IFTYPE_AP_VLAN
:
1534 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
);
1536 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1537 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1538 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1541 case NL80211_IFTYPE_WDS
:
1542 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1544 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
1545 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1546 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1547 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1550 #ifdef CONFIG_MAC80211_MESH
1551 case NL80211_IFTYPE_MESH_POINT
:
1552 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1553 if (!sdata
->u
.mesh
.mshcfg
.dot11MeshTTL
) {
1554 /* Do not send frames with mesh_ttl == 0 */
1555 sdata
->u
.mesh
.mshstats
.dropped_frames_ttl
++;
1559 memset(&mesh_hdr
, 0, sizeof(mesh_hdr
));
1561 if (compare_ether_addr(dev
->dev_addr
,
1562 skb
->data
+ ETH_ALEN
) == 0) {
1564 memset(hdr
.addr1
, 0, ETH_ALEN
);
1565 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1566 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1567 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1568 meshhdrlen
= ieee80211_new_mesh_header(&mesh_hdr
, sdata
);
1570 /* packet from other interface */
1571 struct mesh_path
*mppath
;
1573 memset(hdr
.addr1
, 0, ETH_ALEN
);
1574 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1575 memcpy(hdr
.addr4
, dev
->dev_addr
, ETH_ALEN
);
1577 if (is_multicast_ether_addr(skb
->data
))
1578 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1581 mppath
= mpp_path_lookup(skb
->data
, sdata
);
1583 memcpy(hdr
.addr3
, mppath
->mpp
, ETH_ALEN
);
1585 memset(hdr
.addr3
, 0xff, ETH_ALEN
);
1589 mesh_hdr
.flags
|= MESH_FLAGS_AE_A5_A6
;
1590 mesh_hdr
.ttl
= sdata
->u
.mesh
.mshcfg
.dot11MeshTTL
;
1591 put_unaligned(cpu_to_le32(sdata
->u
.mesh
.mesh_seqnum
), &mesh_hdr
.seqnum
);
1592 memcpy(mesh_hdr
.eaddr1
, skb
->data
, ETH_ALEN
);
1593 memcpy(mesh_hdr
.eaddr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1594 sdata
->u
.mesh
.mesh_seqnum
++;
1600 case NL80211_IFTYPE_STATION
:
1601 fc
|= cpu_to_le16(IEEE80211_FCTL_TODS
);
1603 memcpy(hdr
.addr1
, sdata
->u
.sta
.bssid
, ETH_ALEN
);
1604 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1605 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1608 case NL80211_IFTYPE_ADHOC
:
1610 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1611 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1612 memcpy(hdr
.addr3
, sdata
->u
.sta
.bssid
, ETH_ALEN
);
1621 * There's no need to try to look up the destination
1622 * if it is a multicast address (which can only happen
1625 if (!is_multicast_ether_addr(hdr
.addr1
)) {
1627 sta
= sta_info_get(local
, hdr
.addr1
);
1629 sta_flags
= get_sta_flags(sta
);
1633 /* receiver and we are QoS enabled, use a QoS type frame */
1634 if (sta_flags
& WLAN_STA_WME
&&
1635 ieee80211_num_regular_queues(&local
->hw
) >= 4) {
1636 fc
|= cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1641 * Drop unicast frames to unauthorised stations unless they are
1642 * EAPOL frames from the local station.
1644 if (!ieee80211_vif_is_mesh(&sdata
->vif
) &&
1645 unlikely(!is_multicast_ether_addr(hdr
.addr1
) &&
1646 !(sta_flags
& WLAN_STA_AUTHORIZED
) &&
1647 !(ethertype
== ETH_P_PAE
&&
1648 compare_ether_addr(dev
->dev_addr
,
1649 skb
->data
+ ETH_ALEN
) == 0))) {
1650 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1651 if (net_ratelimit())
1652 printk(KERN_DEBUG
"%s: dropped frame to %pM"
1653 " (unauthorized port)\n", dev
->name
,
1657 I802_DEBUG_INC(local
->tx_handlers_drop_unauth_port
);
1663 hdr
.frame_control
= fc
;
1664 hdr
.duration_id
= 0;
1667 skip_header_bytes
= ETH_HLEN
;
1668 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
1669 encaps_data
= bridge_tunnel_header
;
1670 encaps_len
= sizeof(bridge_tunnel_header
);
1671 skip_header_bytes
-= 2;
1672 } else if (ethertype
>= 0x600) {
1673 encaps_data
= rfc1042_header
;
1674 encaps_len
= sizeof(rfc1042_header
);
1675 skip_header_bytes
-= 2;
1681 skb_pull(skb
, skip_header_bytes
);
1682 nh_pos
-= skip_header_bytes
;
1683 h_pos
-= skip_header_bytes
;
1685 head_need
= hdrlen
+ encaps_len
+ meshhdrlen
- skb_headroom(skb
);
1688 * So we need to modify the skb header and hence need a copy of
1689 * that. The head_need variable above doesn't, so far, include
1690 * the needed header space that we don't need right away. If we
1691 * can, then we don't reallocate right now but only after the
1692 * frame arrives at the master device (if it does...)
1694 * If we cannot, however, then we will reallocate to include all
1695 * the ever needed space. Also, if we need to reallocate it anyway,
1696 * make it big enough for everything we may ever need.
1699 if (head_need
> 0 || skb_cloned(skb
)) {
1700 head_need
+= IEEE80211_ENCRYPT_HEADROOM
;
1701 head_need
+= local
->tx_headroom
;
1702 head_need
= max_t(int, 0, head_need
);
1703 if (ieee80211_skb_resize(local
, skb
, head_need
, true))
1708 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
1709 nh_pos
+= encaps_len
;
1710 h_pos
+= encaps_len
;
1713 if (meshhdrlen
> 0) {
1714 memcpy(skb_push(skb
, meshhdrlen
), &mesh_hdr
, meshhdrlen
);
1715 nh_pos
+= meshhdrlen
;
1716 h_pos
+= meshhdrlen
;
1719 if (ieee80211_is_data_qos(fc
)) {
1720 __le16
*qos_control
;
1722 qos_control
= (__le16
*) skb_push(skb
, 2);
1723 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
1725 * Maybe we could actually set some fields here, for now just
1726 * initialise to zero to indicate no special operation.
1730 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
1735 skb
->iif
= dev
->ifindex
;
1737 skb
->dev
= local
->mdev
;
1738 dev
->stats
.tx_packets
++;
1739 dev
->stats
.tx_bytes
+= skb
->len
;
1741 /* Update skb pointers to various headers since this modified frame
1742 * is going to go through Linux networking code that may potentially
1743 * need things like pointer to IP header. */
1744 skb_set_mac_header(skb
, 0);
1745 skb_set_network_header(skb
, nh_pos
);
1746 skb_set_transport_header(skb
, h_pos
);
1748 dev
->trans_start
= jiffies
;
1749 dev_queue_xmit(skb
);
1762 * ieee80211_clear_tx_pending may not be called in a context where
1763 * it is possible that it packets could come in again.
1765 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
1768 struct ieee80211_tx_stored_packet
*store
;
1770 for (i
= 0; i
< ieee80211_num_regular_queues(&local
->hw
); i
++) {
1771 if (!test_bit(i
, local
->queues_pending
))
1773 store
= &local
->pending_packet
[i
];
1774 kfree_skb(store
->skb
);
1775 for (j
= 0; j
< store
->num_extra_frag
; j
++)
1776 kfree_skb(store
->extra_frag
[j
]);
1777 kfree(store
->extra_frag
);
1778 clear_bit(i
, local
->queues_pending
);
1783 * Transmit all pending packets. Called from tasklet, locks master device
1784 * TX lock so that no new packets can come in.
1786 void ieee80211_tx_pending(unsigned long data
)
1788 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
1789 struct net_device
*dev
= local
->mdev
;
1790 struct ieee80211_tx_stored_packet
*store
;
1791 struct ieee80211_tx_data tx
;
1794 netif_tx_lock_bh(dev
);
1795 for (i
= 0; i
< ieee80211_num_regular_queues(&local
->hw
); i
++) {
1796 /* Check that this queue is ok */
1797 if (__netif_subqueue_stopped(local
->mdev
, i
) &&
1798 !test_bit(i
, local
->queues_pending_run
))
1801 if (!test_bit(i
, local
->queues_pending
)) {
1802 clear_bit(i
, local
->queues_pending_run
);
1803 ieee80211_wake_queue(&local
->hw
, i
);
1807 clear_bit(i
, local
->queues_pending_run
);
1808 netif_start_subqueue(local
->mdev
, i
);
1810 store
= &local
->pending_packet
[i
];
1811 tx
.extra_frag
= store
->extra_frag
;
1812 tx
.num_extra_frag
= store
->num_extra_frag
;
1814 ret
= __ieee80211_tx(local
, store
->skb
, &tx
);
1816 if (ret
== IEEE80211_TX_FRAG_AGAIN
)
1819 clear_bit(i
, local
->queues_pending
);
1820 ieee80211_wake_queue(&local
->hw
, i
);
1823 netif_tx_unlock_bh(dev
);
1826 /* functions for drivers to get certain frames */
1828 static void ieee80211_beacon_add_tim(struct ieee80211_if_ap
*bss
,
1829 struct sk_buff
*skb
,
1830 struct beacon_data
*beacon
)
1834 int i
, have_bits
= 0, n1
, n2
;
1836 /* Generate bitmap for TIM only if there are any STAs in power save
1838 if (atomic_read(&bss
->num_sta_ps
) > 0)
1839 /* in the hope that this is faster than
1840 * checking byte-for-byte */
1841 have_bits
= !bitmap_empty((unsigned long*)bss
->tim
,
1842 IEEE80211_MAX_AID
+1);
1844 if (bss
->dtim_count
== 0)
1845 bss
->dtim_count
= beacon
->dtim_period
- 1;
1849 tim
= pos
= (u8
*) skb_put(skb
, 6);
1850 *pos
++ = WLAN_EID_TIM
;
1852 *pos
++ = bss
->dtim_count
;
1853 *pos
++ = beacon
->dtim_period
;
1855 if (bss
->dtim_count
== 0 && !skb_queue_empty(&bss
->ps_bc_buf
))
1859 /* Find largest even number N1 so that bits numbered 1 through
1860 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1861 * (N2 + 1) x 8 through 2007 are 0. */
1863 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
1870 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
1877 /* Bitmap control */
1879 /* Part Virt Bitmap */
1880 memcpy(pos
, bss
->tim
+ n1
, n2
- n1
+ 1);
1882 tim
[1] = n2
- n1
+ 4;
1883 skb_put(skb
, n2
- n1
);
1885 *pos
++ = aid0
; /* Bitmap control */
1886 *pos
++ = 0; /* Part Virt Bitmap */
1890 struct sk_buff
*ieee80211_beacon_get(struct ieee80211_hw
*hw
,
1891 struct ieee80211_vif
*vif
)
1893 struct ieee80211_local
*local
= hw_to_local(hw
);
1894 struct sk_buff
*skb
= NULL
;
1895 struct ieee80211_tx_info
*info
;
1896 struct ieee80211_sub_if_data
*sdata
= NULL
;
1897 struct ieee80211_if_ap
*ap
= NULL
;
1898 struct ieee80211_if_sta
*ifsta
= NULL
;
1899 struct beacon_data
*beacon
;
1900 struct ieee80211_supported_band
*sband
;
1901 enum ieee80211_band band
= local
->hw
.conf
.channel
->band
;
1903 sband
= local
->hw
.wiphy
->bands
[band
];
1907 sdata
= vif_to_sdata(vif
);
1909 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
1911 beacon
= rcu_dereference(ap
->beacon
);
1914 * headroom, head length,
1915 * tail length and maximum TIM length
1917 skb
= dev_alloc_skb(local
->tx_headroom
+
1919 beacon
->tail_len
+ 256);
1923 skb_reserve(skb
, local
->tx_headroom
);
1924 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
1928 * Not very nice, but we want to allow the driver to call
1929 * ieee80211_beacon_get() as a response to the set_tim()
1930 * callback. That, however, is already invoked under the
1931 * sta_lock to guarantee consistent and race-free update
1932 * of the tim bitmap in mac80211 and the driver.
1934 if (local
->tim_in_locked_section
) {
1935 ieee80211_beacon_add_tim(ap
, skb
, beacon
);
1937 unsigned long flags
;
1939 spin_lock_irqsave(&local
->sta_lock
, flags
);
1940 ieee80211_beacon_add_tim(ap
, skb
, beacon
);
1941 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
1945 memcpy(skb_put(skb
, beacon
->tail_len
),
1946 beacon
->tail
, beacon
->tail_len
);
1949 } else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
1950 struct ieee80211_hdr
*hdr
;
1951 ifsta
= &sdata
->u
.sta
;
1953 if (!ifsta
->probe_resp
)
1956 skb
= skb_copy(ifsta
->probe_resp
, GFP_ATOMIC
);
1960 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1961 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
1962 IEEE80211_STYPE_BEACON
);
1964 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
1965 struct ieee80211_mgmt
*mgmt
;
1968 /* headroom, head length, tail length and maximum TIM length */
1969 skb
= dev_alloc_skb(local
->tx_headroom
+ 400);
1973 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
1974 mgmt
= (struct ieee80211_mgmt
*)
1975 skb_put(skb
, 24 + sizeof(mgmt
->u
.beacon
));
1976 memset(mgmt
, 0, 24 + sizeof(mgmt
->u
.beacon
));
1977 mgmt
->frame_control
=
1978 cpu_to_le16(IEEE80211_FTYPE_MGMT
| IEEE80211_STYPE_BEACON
);
1979 memset(mgmt
->da
, 0xff, ETH_ALEN
);
1980 memcpy(mgmt
->sa
, sdata
->dev
->dev_addr
, ETH_ALEN
);
1981 /* BSSID is left zeroed, wildcard value */
1982 mgmt
->u
.beacon
.beacon_int
=
1983 cpu_to_le16(local
->hw
.conf
.beacon_int
);
1984 mgmt
->u
.beacon
.capab_info
= 0x0; /* 0x0 for MPs */
1986 pos
= skb_put(skb
, 2);
1987 *pos
++ = WLAN_EID_SSID
;
1990 mesh_mgmt_ies_add(skb
, sdata
);
1996 info
= IEEE80211_SKB_CB(skb
);
1998 skb
->do_not_encrypt
= 1;
2002 * XXX: For now, always use the lowest rate
2004 info
->control
.rates
[0].idx
= 0;
2005 info
->control
.rates
[0].count
= 1;
2006 info
->control
.rates
[1].idx
= -1;
2007 info
->control
.rates
[2].idx
= -1;
2008 info
->control
.rates
[3].idx
= -1;
2009 info
->control
.rates
[4].idx
= -1;
2010 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES
!= 5);
2012 info
->control
.vif
= vif
;
2014 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
2015 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
2016 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
2021 EXPORT_SYMBOL(ieee80211_beacon_get
);
2023 void ieee80211_rts_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2024 const void *frame
, size_t frame_len
,
2025 const struct ieee80211_tx_info
*frame_txctl
,
2026 struct ieee80211_rts
*rts
)
2028 const struct ieee80211_hdr
*hdr
= frame
;
2030 rts
->frame_control
=
2031 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
);
2032 rts
->duration
= ieee80211_rts_duration(hw
, vif
, frame_len
,
2034 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
2035 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
2037 EXPORT_SYMBOL(ieee80211_rts_get
);
2039 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2040 const void *frame
, size_t frame_len
,
2041 const struct ieee80211_tx_info
*frame_txctl
,
2042 struct ieee80211_cts
*cts
)
2044 const struct ieee80211_hdr
*hdr
= frame
;
2046 cts
->frame_control
=
2047 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
);
2048 cts
->duration
= ieee80211_ctstoself_duration(hw
, vif
,
2049 frame_len
, frame_txctl
);
2050 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
2052 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
2055 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
,
2056 struct ieee80211_vif
*vif
)
2058 struct ieee80211_local
*local
= hw_to_local(hw
);
2059 struct sk_buff
*skb
= NULL
;
2060 struct sta_info
*sta
;
2061 struct ieee80211_tx_data tx
;
2062 struct ieee80211_sub_if_data
*sdata
;
2063 struct ieee80211_if_ap
*bss
= NULL
;
2064 struct beacon_data
*beacon
;
2065 struct ieee80211_tx_info
*info
;
2067 sdata
= vif_to_sdata(vif
);
2074 beacon
= rcu_dereference(bss
->beacon
);
2076 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
|| !beacon
|| !beacon
->head
)
2079 if (bss
->dtim_count
!= 0)
2080 goto out
; /* send buffered bc/mc only after DTIM beacon */
2083 skb
= skb_dequeue(&bss
->ps_bc_buf
);
2086 local
->total_ps_buffered
--;
2088 if (!skb_queue_empty(&bss
->ps_bc_buf
) && skb
->len
>= 2) {
2089 struct ieee80211_hdr
*hdr
=
2090 (struct ieee80211_hdr
*) skb
->data
;
2091 /* more buffered multicast/broadcast frames ==> set
2092 * MoreData flag in IEEE 802.11 header to inform PS
2094 hdr
->frame_control
|=
2095 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
2098 if (!ieee80211_tx_prepare(local
, &tx
, skb
))
2100 dev_kfree_skb_any(skb
);
2103 info
= IEEE80211_SKB_CB(skb
);
2106 tx
.flags
|= IEEE80211_TX_PS_BUFFERED
;
2107 tx
.channel
= local
->hw
.conf
.channel
;
2108 info
->band
= tx
.channel
->band
;
2110 if (invoke_tx_handlers(&tx
))
2117 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);